Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1 | #include <linux/bitops.h> |
| 2 | #include <linux/slab.h> |
| 3 | #include <linux/bio.h> |
| 4 | #include <linux/mm.h> |
| 5 | #include <linux/gfp.h> |
| 6 | #include <linux/pagemap.h> |
| 7 | #include <linux/page-flags.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/spinlock.h> |
| 10 | #include <linux/blkdev.h> |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 11 | #include <linux/swap.h> |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 12 | #include <linux/version.h> |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 13 | #include <linux/writeback.h> |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 14 | #include <linux/pagevec.h> |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 15 | #include "extent_map.h" |
| 16 | |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 17 | /* temporary define until extent_map moves out of btrfs */ |
| 18 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
| 19 | unsigned long extra_flags, |
| 20 | void (*ctor)(void *, struct kmem_cache *, |
| 21 | unsigned long)); |
| 22 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 23 | static struct kmem_cache *extent_map_cache; |
| 24 | static struct kmem_cache *extent_state_cache; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 25 | static struct kmem_cache *extent_buffer_cache; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 26 | |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 27 | static LIST_HEAD(buffers); |
| 28 | static LIST_HEAD(states); |
| 29 | |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 30 | static spinlock_t state_lock = SPIN_LOCK_UNLOCKED; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 31 | #define BUFFER_LRU_MAX 64 |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 32 | |
| 33 | struct tree_entry { |
| 34 | u64 start; |
| 35 | u64 end; |
| 36 | int in_tree; |
| 37 | struct rb_node rb_node; |
| 38 | }; |
| 39 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 40 | struct extent_page_data { |
| 41 | struct bio *bio; |
| 42 | struct extent_map_tree *tree; |
| 43 | get_extent_t *get_extent; |
| 44 | }; |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 45 | |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 46 | int __init extent_map_init(void) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 47 | { |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 48 | extent_map_cache = btrfs_cache_create("extent_map", |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 49 | sizeof(struct extent_map), 0, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 50 | NULL); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 51 | if (!extent_map_cache) |
| 52 | return -ENOMEM; |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 53 | extent_state_cache = btrfs_cache_create("extent_state", |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 54 | sizeof(struct extent_state), 0, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 55 | NULL); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 56 | if (!extent_state_cache) |
| 57 | goto free_map_cache; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 58 | extent_buffer_cache = btrfs_cache_create("extent_buffers", |
| 59 | sizeof(struct extent_buffer), 0, |
| 60 | NULL); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 61 | if (!extent_buffer_cache) |
| 62 | goto free_state_cache; |
| 63 | return 0; |
| 64 | |
| 65 | free_state_cache: |
| 66 | kmem_cache_destroy(extent_state_cache); |
| 67 | free_map_cache: |
| 68 | kmem_cache_destroy(extent_map_cache); |
| 69 | return -ENOMEM; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 70 | } |
| 71 | |
Christian Hesse | 17636e0 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 72 | void extent_map_exit(void) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 73 | { |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 74 | struct extent_state *state; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 75 | |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 76 | while (!list_empty(&states)) { |
| 77 | state = list_entry(states.next, struct extent_state, list); |
| 78 | printk("state leak: start %Lu end %Lu state %lu in tree %d refs %d\n", state->start, state->end, state->state, state->in_tree, atomic_read(&state->refs)); |
| 79 | list_del(&state->list); |
| 80 | kmem_cache_free(extent_state_cache, state); |
| 81 | |
| 82 | } |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 83 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 84 | if (extent_map_cache) |
| 85 | kmem_cache_destroy(extent_map_cache); |
| 86 | if (extent_state_cache) |
| 87 | kmem_cache_destroy(extent_state_cache); |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 88 | if (extent_buffer_cache) |
| 89 | kmem_cache_destroy(extent_buffer_cache); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | void extent_map_tree_init(struct extent_map_tree *tree, |
| 93 | struct address_space *mapping, gfp_t mask) |
| 94 | { |
| 95 | tree->map.rb_node = NULL; |
| 96 | tree->state.rb_node = NULL; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 97 | tree->ops = NULL; |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 98 | tree->dirty_bytes = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 99 | rwlock_init(&tree->lock); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 100 | spin_lock_init(&tree->lru_lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 101 | tree->mapping = mapping; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 102 | INIT_LIST_HEAD(&tree->buffer_lru); |
| 103 | tree->lru_size = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 104 | } |
| 105 | EXPORT_SYMBOL(extent_map_tree_init); |
| 106 | |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 107 | void extent_map_tree_empty_lru(struct extent_map_tree *tree) |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 108 | { |
| 109 | struct extent_buffer *eb; |
| 110 | while(!list_empty(&tree->buffer_lru)) { |
| 111 | eb = list_entry(tree->buffer_lru.next, struct extent_buffer, |
| 112 | lru); |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 113 | list_del_init(&eb->lru); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 114 | free_extent_buffer(eb); |
| 115 | } |
| 116 | } |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 117 | EXPORT_SYMBOL(extent_map_tree_empty_lru); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 118 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 119 | struct extent_map *alloc_extent_map(gfp_t mask) |
| 120 | { |
| 121 | struct extent_map *em; |
| 122 | em = kmem_cache_alloc(extent_map_cache, mask); |
| 123 | if (!em || IS_ERR(em)) |
| 124 | return em; |
| 125 | em->in_tree = 0; |
| 126 | atomic_set(&em->refs, 1); |
| 127 | return em; |
| 128 | } |
| 129 | EXPORT_SYMBOL(alloc_extent_map); |
| 130 | |
| 131 | void free_extent_map(struct extent_map *em) |
| 132 | { |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 133 | if (!em) |
| 134 | return; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 135 | if (atomic_dec_and_test(&em->refs)) { |
| 136 | WARN_ON(em->in_tree); |
| 137 | kmem_cache_free(extent_map_cache, em); |
| 138 | } |
| 139 | } |
| 140 | EXPORT_SYMBOL(free_extent_map); |
| 141 | |
| 142 | |
| 143 | struct extent_state *alloc_extent_state(gfp_t mask) |
| 144 | { |
| 145 | struct extent_state *state; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 146 | unsigned long flags; |
| 147 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 148 | state = kmem_cache_alloc(extent_state_cache, mask); |
| 149 | if (!state || IS_ERR(state)) |
| 150 | return state; |
| 151 | state->state = 0; |
| 152 | state->in_tree = 0; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 153 | state->private = 0; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 154 | |
| 155 | spin_lock_irqsave(&state_lock, flags); |
| 156 | list_add(&state->list, &states); |
| 157 | spin_unlock_irqrestore(&state_lock, flags); |
| 158 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 159 | atomic_set(&state->refs, 1); |
| 160 | init_waitqueue_head(&state->wq); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 161 | return state; |
| 162 | } |
| 163 | EXPORT_SYMBOL(alloc_extent_state); |
| 164 | |
| 165 | void free_extent_state(struct extent_state *state) |
| 166 | { |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 167 | unsigned long flags; |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 168 | if (!state) |
| 169 | return; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 170 | if (atomic_dec_and_test(&state->refs)) { |
| 171 | WARN_ON(state->in_tree); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 172 | spin_lock_irqsave(&state_lock, flags); |
| 173 | list_del(&state->list); |
| 174 | spin_unlock_irqrestore(&state_lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 175 | kmem_cache_free(extent_state_cache, state); |
| 176 | } |
| 177 | } |
| 178 | EXPORT_SYMBOL(free_extent_state); |
| 179 | |
| 180 | static struct rb_node *tree_insert(struct rb_root *root, u64 offset, |
| 181 | struct rb_node *node) |
| 182 | { |
| 183 | struct rb_node ** p = &root->rb_node; |
| 184 | struct rb_node * parent = NULL; |
| 185 | struct tree_entry *entry; |
| 186 | |
| 187 | while(*p) { |
| 188 | parent = *p; |
| 189 | entry = rb_entry(parent, struct tree_entry, rb_node); |
| 190 | |
| 191 | if (offset < entry->start) |
| 192 | p = &(*p)->rb_left; |
| 193 | else if (offset > entry->end) |
| 194 | p = &(*p)->rb_right; |
| 195 | else |
| 196 | return parent; |
| 197 | } |
| 198 | |
| 199 | entry = rb_entry(node, struct tree_entry, rb_node); |
| 200 | entry->in_tree = 1; |
| 201 | rb_link_node(node, parent, p); |
| 202 | rb_insert_color(node, root); |
| 203 | return NULL; |
| 204 | } |
| 205 | |
| 206 | static struct rb_node *__tree_search(struct rb_root *root, u64 offset, |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 207 | struct rb_node **prev_ret, |
| 208 | struct rb_node **next_ret) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 209 | { |
| 210 | struct rb_node * n = root->rb_node; |
| 211 | struct rb_node *prev = NULL; |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 212 | struct rb_node *orig_prev = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 213 | struct tree_entry *entry; |
| 214 | struct tree_entry *prev_entry = NULL; |
| 215 | |
| 216 | while(n) { |
| 217 | entry = rb_entry(n, struct tree_entry, rb_node); |
| 218 | prev = n; |
| 219 | prev_entry = entry; |
| 220 | |
| 221 | if (offset < entry->start) |
| 222 | n = n->rb_left; |
| 223 | else if (offset > entry->end) |
| 224 | n = n->rb_right; |
| 225 | else |
| 226 | return n; |
| 227 | } |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 228 | |
| 229 | if (prev_ret) { |
| 230 | orig_prev = prev; |
| 231 | while(prev && offset > prev_entry->end) { |
| 232 | prev = rb_next(prev); |
| 233 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); |
| 234 | } |
| 235 | *prev_ret = prev; |
| 236 | prev = orig_prev; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 237 | } |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 238 | |
| 239 | if (next_ret) { |
| 240 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); |
| 241 | while(prev && offset < prev_entry->start) { |
| 242 | prev = rb_prev(prev); |
| 243 | prev_entry = rb_entry(prev, struct tree_entry, rb_node); |
| 244 | } |
| 245 | *next_ret = prev; |
| 246 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 247 | return NULL; |
| 248 | } |
| 249 | |
| 250 | static inline struct rb_node *tree_search(struct rb_root *root, u64 offset) |
| 251 | { |
| 252 | struct rb_node *prev; |
| 253 | struct rb_node *ret; |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 254 | ret = __tree_search(root, offset, &prev, NULL); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 255 | if (!ret) |
| 256 | return prev; |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | static int tree_delete(struct rb_root *root, u64 offset) |
| 261 | { |
| 262 | struct rb_node *node; |
| 263 | struct tree_entry *entry; |
| 264 | |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 265 | node = __tree_search(root, offset, NULL, NULL); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 266 | if (!node) |
| 267 | return -ENOENT; |
| 268 | entry = rb_entry(node, struct tree_entry, rb_node); |
| 269 | entry->in_tree = 0; |
| 270 | rb_erase(node, root); |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * add_extent_mapping tries a simple backward merge with existing |
| 276 | * mappings. The extent_map struct passed in will be inserted into |
| 277 | * the tree directly (no copies made, just a reference taken). |
| 278 | */ |
| 279 | int add_extent_mapping(struct extent_map_tree *tree, |
| 280 | struct extent_map *em) |
| 281 | { |
| 282 | int ret = 0; |
| 283 | struct extent_map *prev = NULL; |
| 284 | struct rb_node *rb; |
| 285 | |
| 286 | write_lock_irq(&tree->lock); |
| 287 | rb = tree_insert(&tree->map, em->end, &em->rb_node); |
| 288 | if (rb) { |
| 289 | prev = rb_entry(rb, struct extent_map, rb_node); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 290 | ret = -EEXIST; |
| 291 | goto out; |
| 292 | } |
| 293 | atomic_inc(&em->refs); |
| 294 | if (em->start != 0) { |
| 295 | rb = rb_prev(&em->rb_node); |
| 296 | if (rb) |
| 297 | prev = rb_entry(rb, struct extent_map, rb_node); |
| 298 | if (prev && prev->end + 1 == em->start && |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 299 | ((em->block_start == EXTENT_MAP_HOLE && |
| 300 | prev->block_start == EXTENT_MAP_HOLE) || |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 301 | (em->block_start == EXTENT_MAP_INLINE && |
| 302 | prev->block_start == EXTENT_MAP_INLINE) || |
| 303 | (em->block_start == EXTENT_MAP_DELALLOC && |
| 304 | prev->block_start == EXTENT_MAP_DELALLOC) || |
| 305 | (em->block_start < EXTENT_MAP_DELALLOC - 1 && |
| 306 | em->block_start == prev->block_end + 1))) { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 307 | em->start = prev->start; |
| 308 | em->block_start = prev->block_start; |
| 309 | rb_erase(&prev->rb_node, &tree->map); |
| 310 | prev->in_tree = 0; |
| 311 | free_extent_map(prev); |
| 312 | } |
| 313 | } |
| 314 | out: |
| 315 | write_unlock_irq(&tree->lock); |
| 316 | return ret; |
| 317 | } |
| 318 | EXPORT_SYMBOL(add_extent_mapping); |
| 319 | |
| 320 | /* |
| 321 | * lookup_extent_mapping returns the first extent_map struct in the |
| 322 | * tree that intersects the [start, end] (inclusive) range. There may |
| 323 | * be additional objects in the tree that intersect, so check the object |
| 324 | * returned carefully to make sure you don't need additional lookups. |
| 325 | */ |
| 326 | struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, |
| 327 | u64 start, u64 end) |
| 328 | { |
| 329 | struct extent_map *em; |
| 330 | struct rb_node *rb_node; |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 331 | struct rb_node *prev = NULL; |
| 332 | struct rb_node *next = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 333 | |
| 334 | read_lock_irq(&tree->lock); |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 335 | rb_node = __tree_search(&tree->map, start, &prev, &next); |
| 336 | if (!rb_node && prev) { |
| 337 | em = rb_entry(prev, struct extent_map, rb_node); |
| 338 | if (em->start <= end && em->end >= start) |
| 339 | goto found; |
| 340 | } |
| 341 | if (!rb_node && next) { |
| 342 | em = rb_entry(next, struct extent_map, rb_node); |
| 343 | if (em->start <= end && em->end >= start) |
| 344 | goto found; |
| 345 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 346 | if (!rb_node) { |
| 347 | em = NULL; |
| 348 | goto out; |
| 349 | } |
| 350 | if (IS_ERR(rb_node)) { |
| 351 | em = ERR_PTR(PTR_ERR(rb_node)); |
| 352 | goto out; |
| 353 | } |
| 354 | em = rb_entry(rb_node, struct extent_map, rb_node); |
| 355 | if (em->end < start || em->start > end) { |
| 356 | em = NULL; |
| 357 | goto out; |
| 358 | } |
Chris Mason | 5f56406 | 2008-01-22 16:47:59 -0500 | [diff] [blame^] | 359 | found: |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 360 | atomic_inc(&em->refs); |
| 361 | out: |
| 362 | read_unlock_irq(&tree->lock); |
| 363 | return em; |
| 364 | } |
| 365 | EXPORT_SYMBOL(lookup_extent_mapping); |
| 366 | |
| 367 | /* |
| 368 | * removes an extent_map struct from the tree. No reference counts are |
| 369 | * dropped, and no checks are done to see if the range is in use |
| 370 | */ |
| 371 | int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em) |
| 372 | { |
| 373 | int ret; |
| 374 | |
| 375 | write_lock_irq(&tree->lock); |
| 376 | ret = tree_delete(&tree->map, em->end); |
| 377 | write_unlock_irq(&tree->lock); |
| 378 | return ret; |
| 379 | } |
| 380 | EXPORT_SYMBOL(remove_extent_mapping); |
| 381 | |
| 382 | /* |
| 383 | * utility function to look for merge candidates inside a given range. |
| 384 | * Any extents with matching state are merged together into a single |
| 385 | * extent in the tree. Extents with EXTENT_IO in their state field |
| 386 | * are not merged because the end_io handlers need to be able to do |
| 387 | * operations on them without sleeping (or doing allocations/splits). |
| 388 | * |
| 389 | * This should be called with the tree lock held. |
| 390 | */ |
| 391 | static int merge_state(struct extent_map_tree *tree, |
| 392 | struct extent_state *state) |
| 393 | { |
| 394 | struct extent_state *other; |
| 395 | struct rb_node *other_node; |
| 396 | |
| 397 | if (state->state & EXTENT_IOBITS) |
| 398 | return 0; |
| 399 | |
| 400 | other_node = rb_prev(&state->rb_node); |
| 401 | if (other_node) { |
| 402 | other = rb_entry(other_node, struct extent_state, rb_node); |
| 403 | if (other->end == state->start - 1 && |
| 404 | other->state == state->state) { |
| 405 | state->start = other->start; |
| 406 | other->in_tree = 0; |
| 407 | rb_erase(&other->rb_node, &tree->state); |
| 408 | free_extent_state(other); |
| 409 | } |
| 410 | } |
| 411 | other_node = rb_next(&state->rb_node); |
| 412 | if (other_node) { |
| 413 | other = rb_entry(other_node, struct extent_state, rb_node); |
| 414 | if (other->start == state->end + 1 && |
| 415 | other->state == state->state) { |
| 416 | other->start = state->start; |
| 417 | state->in_tree = 0; |
| 418 | rb_erase(&state->rb_node, &tree->state); |
| 419 | free_extent_state(state); |
| 420 | } |
| 421 | } |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * insert an extent_state struct into the tree. 'bits' are set on the |
| 427 | * struct before it is inserted. |
| 428 | * |
| 429 | * This may return -EEXIST if the extent is already there, in which case the |
| 430 | * state struct is freed. |
| 431 | * |
| 432 | * The tree lock is not taken internally. This is a utility function and |
| 433 | * probably isn't what you want to call (see set/clear_extent_bit). |
| 434 | */ |
| 435 | static int insert_state(struct extent_map_tree *tree, |
| 436 | struct extent_state *state, u64 start, u64 end, |
| 437 | int bits) |
| 438 | { |
| 439 | struct rb_node *node; |
| 440 | |
| 441 | if (end < start) { |
| 442 | printk("end < start %Lu %Lu\n", end, start); |
| 443 | WARN_ON(1); |
| 444 | } |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 445 | if (bits & EXTENT_DIRTY) |
| 446 | tree->dirty_bytes += end - start + 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 447 | state->state |= bits; |
| 448 | state->start = start; |
| 449 | state->end = end; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 450 | node = tree_insert(&tree->state, end, &state->rb_node); |
| 451 | if (node) { |
| 452 | struct extent_state *found; |
| 453 | found = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 454 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 455 | free_extent_state(state); |
| 456 | return -EEXIST; |
| 457 | } |
| 458 | merge_state(tree, state); |
| 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * split a given extent state struct in two, inserting the preallocated |
| 464 | * struct 'prealloc' as the newly created second half. 'split' indicates an |
| 465 | * offset inside 'orig' where it should be split. |
| 466 | * |
| 467 | * Before calling, |
| 468 | * the tree has 'orig' at [orig->start, orig->end]. After calling, there |
| 469 | * are two extent state structs in the tree: |
| 470 | * prealloc: [orig->start, split - 1] |
| 471 | * orig: [ split, orig->end ] |
| 472 | * |
| 473 | * The tree locks are not taken by this function. They need to be held |
| 474 | * by the caller. |
| 475 | */ |
| 476 | static int split_state(struct extent_map_tree *tree, struct extent_state *orig, |
| 477 | struct extent_state *prealloc, u64 split) |
| 478 | { |
| 479 | struct rb_node *node; |
| 480 | prealloc->start = orig->start; |
| 481 | prealloc->end = split - 1; |
| 482 | prealloc->state = orig->state; |
| 483 | orig->start = split; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 484 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 485 | node = tree_insert(&tree->state, prealloc->end, &prealloc->rb_node); |
| 486 | if (node) { |
| 487 | struct extent_state *found; |
| 488 | found = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 489 | printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 490 | free_extent_state(prealloc); |
| 491 | return -EEXIST; |
| 492 | } |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * utility function to clear some bits in an extent state struct. |
| 498 | * it will optionally wake up any one waiting on this state (wake == 1), or |
| 499 | * forcibly remove the state from the tree (delete == 1). |
| 500 | * |
| 501 | * If no bits are set on the state struct after clearing things, the |
| 502 | * struct is freed and removed from the tree |
| 503 | */ |
| 504 | static int clear_state_bit(struct extent_map_tree *tree, |
| 505 | struct extent_state *state, int bits, int wake, |
| 506 | int delete) |
| 507 | { |
| 508 | int ret = state->state & bits; |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 509 | |
| 510 | if ((bits & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
| 511 | u64 range = state->end - state->start + 1; |
| 512 | WARN_ON(range > tree->dirty_bytes); |
| 513 | tree->dirty_bytes -= range; |
| 514 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 515 | state->state &= ~bits; |
| 516 | if (wake) |
| 517 | wake_up(&state->wq); |
| 518 | if (delete || state->state == 0) { |
| 519 | if (state->in_tree) { |
| 520 | rb_erase(&state->rb_node, &tree->state); |
| 521 | state->in_tree = 0; |
| 522 | free_extent_state(state); |
| 523 | } else { |
| 524 | WARN_ON(1); |
| 525 | } |
| 526 | } else { |
| 527 | merge_state(tree, state); |
| 528 | } |
| 529 | return ret; |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * clear some bits on a range in the tree. This may require splitting |
| 534 | * or inserting elements in the tree, so the gfp mask is used to |
| 535 | * indicate which allocations or sleeping are allowed. |
| 536 | * |
| 537 | * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove |
| 538 | * the given range from the tree regardless of state (ie for truncate). |
| 539 | * |
| 540 | * the range [start, end] is inclusive. |
| 541 | * |
| 542 | * This takes the tree lock, and returns < 0 on error, > 0 if any of the |
| 543 | * bits were already set, or zero if none of the bits were already set. |
| 544 | */ |
| 545 | int clear_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, |
| 546 | int bits, int wake, int delete, gfp_t mask) |
| 547 | { |
| 548 | struct extent_state *state; |
| 549 | struct extent_state *prealloc = NULL; |
| 550 | struct rb_node *node; |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 551 | unsigned long flags; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 552 | int err; |
| 553 | int set = 0; |
| 554 | |
| 555 | again: |
| 556 | if (!prealloc && (mask & __GFP_WAIT)) { |
| 557 | prealloc = alloc_extent_state(mask); |
| 558 | if (!prealloc) |
| 559 | return -ENOMEM; |
| 560 | } |
| 561 | |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 562 | write_lock_irqsave(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 563 | /* |
| 564 | * this search will find the extents that end after |
| 565 | * our range starts |
| 566 | */ |
| 567 | node = tree_search(&tree->state, start); |
| 568 | if (!node) |
| 569 | goto out; |
| 570 | state = rb_entry(node, struct extent_state, rb_node); |
| 571 | if (state->start > end) |
| 572 | goto out; |
| 573 | WARN_ON(state->end < start); |
| 574 | |
| 575 | /* |
| 576 | * | ---- desired range ---- | |
| 577 | * | state | or |
| 578 | * | ------------- state -------------- | |
| 579 | * |
| 580 | * We need to split the extent we found, and may flip |
| 581 | * bits on second half. |
| 582 | * |
| 583 | * If the extent we found extends past our range, we |
| 584 | * just split and search again. It'll get split again |
| 585 | * the next time though. |
| 586 | * |
| 587 | * If the extent we found is inside our range, we clear |
| 588 | * the desired bit on it. |
| 589 | */ |
| 590 | |
| 591 | if (state->start < start) { |
| 592 | err = split_state(tree, state, prealloc, start); |
| 593 | BUG_ON(err == -EEXIST); |
| 594 | prealloc = NULL; |
| 595 | if (err) |
| 596 | goto out; |
| 597 | if (state->end <= end) { |
| 598 | start = state->end + 1; |
| 599 | set |= clear_state_bit(tree, state, bits, |
| 600 | wake, delete); |
| 601 | } else { |
| 602 | start = state->start; |
| 603 | } |
| 604 | goto search_again; |
| 605 | } |
| 606 | /* |
| 607 | * | ---- desired range ---- | |
| 608 | * | state | |
| 609 | * We need to split the extent, and clear the bit |
| 610 | * on the first half |
| 611 | */ |
| 612 | if (state->start <= end && state->end > end) { |
| 613 | err = split_state(tree, state, prealloc, end + 1); |
| 614 | BUG_ON(err == -EEXIST); |
| 615 | |
| 616 | if (wake) |
| 617 | wake_up(&state->wq); |
| 618 | set |= clear_state_bit(tree, prealloc, bits, |
| 619 | wake, delete); |
| 620 | prealloc = NULL; |
| 621 | goto out; |
| 622 | } |
| 623 | |
| 624 | start = state->end + 1; |
| 625 | set |= clear_state_bit(tree, state, bits, wake, delete); |
| 626 | goto search_again; |
| 627 | |
| 628 | out: |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 629 | write_unlock_irqrestore(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 630 | if (prealloc) |
| 631 | free_extent_state(prealloc); |
| 632 | |
| 633 | return set; |
| 634 | |
| 635 | search_again: |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 636 | if (start > end) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 637 | goto out; |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 638 | write_unlock_irqrestore(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 639 | if (mask & __GFP_WAIT) |
| 640 | cond_resched(); |
| 641 | goto again; |
| 642 | } |
| 643 | EXPORT_SYMBOL(clear_extent_bit); |
| 644 | |
| 645 | static int wait_on_state(struct extent_map_tree *tree, |
| 646 | struct extent_state *state) |
| 647 | { |
| 648 | DEFINE_WAIT(wait); |
| 649 | prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); |
| 650 | read_unlock_irq(&tree->lock); |
| 651 | schedule(); |
| 652 | read_lock_irq(&tree->lock); |
| 653 | finish_wait(&state->wq, &wait); |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * waits for one or more bits to clear on a range in the state tree. |
| 659 | * The range [start, end] is inclusive. |
| 660 | * The tree lock is taken by this function |
| 661 | */ |
| 662 | int wait_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits) |
| 663 | { |
| 664 | struct extent_state *state; |
| 665 | struct rb_node *node; |
| 666 | |
| 667 | read_lock_irq(&tree->lock); |
| 668 | again: |
| 669 | while (1) { |
| 670 | /* |
| 671 | * this search will find all the extents that end after |
| 672 | * our range starts |
| 673 | */ |
| 674 | node = tree_search(&tree->state, start); |
| 675 | if (!node) |
| 676 | break; |
| 677 | |
| 678 | state = rb_entry(node, struct extent_state, rb_node); |
| 679 | |
| 680 | if (state->start > end) |
| 681 | goto out; |
| 682 | |
| 683 | if (state->state & bits) { |
| 684 | start = state->start; |
| 685 | atomic_inc(&state->refs); |
| 686 | wait_on_state(tree, state); |
| 687 | free_extent_state(state); |
| 688 | goto again; |
| 689 | } |
| 690 | start = state->end + 1; |
| 691 | |
| 692 | if (start > end) |
| 693 | break; |
| 694 | |
| 695 | if (need_resched()) { |
| 696 | read_unlock_irq(&tree->lock); |
| 697 | cond_resched(); |
| 698 | read_lock_irq(&tree->lock); |
| 699 | } |
| 700 | } |
| 701 | out: |
| 702 | read_unlock_irq(&tree->lock); |
| 703 | return 0; |
| 704 | } |
| 705 | EXPORT_SYMBOL(wait_extent_bit); |
| 706 | |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 707 | static void set_state_bits(struct extent_map_tree *tree, |
| 708 | struct extent_state *state, |
| 709 | int bits) |
| 710 | { |
| 711 | if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
| 712 | u64 range = state->end - state->start + 1; |
| 713 | tree->dirty_bytes += range; |
| 714 | } |
| 715 | state->state |= bits; |
| 716 | } |
| 717 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 718 | /* |
| 719 | * set some bits on a range in the tree. This may require allocations |
| 720 | * or sleeping, so the gfp mask is used to indicate what is allowed. |
| 721 | * |
| 722 | * If 'exclusive' == 1, this will fail with -EEXIST if some part of the |
| 723 | * range already has the desired bits set. The start of the existing |
| 724 | * range is returned in failed_start in this case. |
| 725 | * |
| 726 | * [start, end] is inclusive |
| 727 | * This takes the tree lock. |
| 728 | */ |
| 729 | int set_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits, |
| 730 | int exclusive, u64 *failed_start, gfp_t mask) |
| 731 | { |
| 732 | struct extent_state *state; |
| 733 | struct extent_state *prealloc = NULL; |
| 734 | struct rb_node *node; |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 735 | unsigned long flags; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 736 | int err = 0; |
| 737 | int set; |
| 738 | u64 last_start; |
| 739 | u64 last_end; |
| 740 | again: |
| 741 | if (!prealloc && (mask & __GFP_WAIT)) { |
| 742 | prealloc = alloc_extent_state(mask); |
| 743 | if (!prealloc) |
| 744 | return -ENOMEM; |
| 745 | } |
| 746 | |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 747 | write_lock_irqsave(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 748 | /* |
| 749 | * this search will find all the extents that end after |
| 750 | * our range starts. |
| 751 | */ |
| 752 | node = tree_search(&tree->state, start); |
| 753 | if (!node) { |
| 754 | err = insert_state(tree, prealloc, start, end, bits); |
| 755 | prealloc = NULL; |
| 756 | BUG_ON(err == -EEXIST); |
| 757 | goto out; |
| 758 | } |
| 759 | |
| 760 | state = rb_entry(node, struct extent_state, rb_node); |
| 761 | last_start = state->start; |
| 762 | last_end = state->end; |
| 763 | |
| 764 | /* |
| 765 | * | ---- desired range ---- | |
| 766 | * | state | |
| 767 | * |
| 768 | * Just lock what we found and keep going |
| 769 | */ |
| 770 | if (state->start == start && state->end <= end) { |
| 771 | set = state->state & bits; |
| 772 | if (set && exclusive) { |
| 773 | *failed_start = state->start; |
| 774 | err = -EEXIST; |
| 775 | goto out; |
| 776 | } |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 777 | set_state_bits(tree, state, bits); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 778 | start = state->end + 1; |
| 779 | merge_state(tree, state); |
| 780 | goto search_again; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * | ---- desired range ---- | |
| 785 | * | state | |
| 786 | * or |
| 787 | * | ------------- state -------------- | |
| 788 | * |
| 789 | * We need to split the extent we found, and may flip bits on |
| 790 | * second half. |
| 791 | * |
| 792 | * If the extent we found extends past our |
| 793 | * range, we just split and search again. It'll get split |
| 794 | * again the next time though. |
| 795 | * |
| 796 | * If the extent we found is inside our range, we set the |
| 797 | * desired bit on it. |
| 798 | */ |
| 799 | if (state->start < start) { |
| 800 | set = state->state & bits; |
| 801 | if (exclusive && set) { |
| 802 | *failed_start = start; |
| 803 | err = -EEXIST; |
| 804 | goto out; |
| 805 | } |
| 806 | err = split_state(tree, state, prealloc, start); |
| 807 | BUG_ON(err == -EEXIST); |
| 808 | prealloc = NULL; |
| 809 | if (err) |
| 810 | goto out; |
| 811 | if (state->end <= end) { |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 812 | set_state_bits(tree, state, bits); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 813 | start = state->end + 1; |
| 814 | merge_state(tree, state); |
| 815 | } else { |
| 816 | start = state->start; |
| 817 | } |
| 818 | goto search_again; |
| 819 | } |
| 820 | /* |
| 821 | * | ---- desired range ---- | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 822 | * | state | or | state | |
| 823 | * |
| 824 | * There's a hole, we need to insert something in it and |
| 825 | * ignore the extent we found. |
| 826 | */ |
| 827 | if (state->start > start) { |
| 828 | u64 this_end; |
| 829 | if (end < last_start) |
| 830 | this_end = end; |
| 831 | else |
| 832 | this_end = last_start -1; |
| 833 | err = insert_state(tree, prealloc, start, this_end, |
| 834 | bits); |
| 835 | prealloc = NULL; |
| 836 | BUG_ON(err == -EEXIST); |
| 837 | if (err) |
| 838 | goto out; |
| 839 | start = this_end + 1; |
| 840 | goto search_again; |
| 841 | } |
Chris Mason | a8c450b | 2007-09-10 20:00:27 -0400 | [diff] [blame] | 842 | /* |
| 843 | * | ---- desired range ---- | |
| 844 | * | state | |
| 845 | * We need to split the extent, and set the bit |
| 846 | * on the first half |
| 847 | */ |
| 848 | if (state->start <= end && state->end > end) { |
| 849 | set = state->state & bits; |
| 850 | if (exclusive && set) { |
| 851 | *failed_start = start; |
| 852 | err = -EEXIST; |
| 853 | goto out; |
| 854 | } |
| 855 | err = split_state(tree, state, prealloc, end + 1); |
| 856 | BUG_ON(err == -EEXIST); |
| 857 | |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 858 | set_state_bits(tree, prealloc, bits); |
Chris Mason | a8c450b | 2007-09-10 20:00:27 -0400 | [diff] [blame] | 859 | merge_state(tree, prealloc); |
| 860 | prealloc = NULL; |
| 861 | goto out; |
| 862 | } |
| 863 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 864 | goto search_again; |
| 865 | |
| 866 | out: |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 867 | write_unlock_irqrestore(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 868 | if (prealloc) |
| 869 | free_extent_state(prealloc); |
| 870 | |
| 871 | return err; |
| 872 | |
| 873 | search_again: |
| 874 | if (start > end) |
| 875 | goto out; |
Christoph Hellwig | 90f1c19 | 2007-09-10 20:02:27 -0400 | [diff] [blame] | 876 | write_unlock_irqrestore(&tree->lock, flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 877 | if (mask & __GFP_WAIT) |
| 878 | cond_resched(); |
| 879 | goto again; |
| 880 | } |
| 881 | EXPORT_SYMBOL(set_extent_bit); |
| 882 | |
| 883 | /* wrappers around set/clear extent bit */ |
| 884 | int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, |
| 885 | gfp_t mask) |
| 886 | { |
| 887 | return set_extent_bit(tree, start, end, EXTENT_DIRTY, 0, NULL, |
| 888 | mask); |
| 889 | } |
| 890 | EXPORT_SYMBOL(set_extent_dirty); |
| 891 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 892 | int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, |
| 893 | int bits, gfp_t mask) |
| 894 | { |
| 895 | return set_extent_bit(tree, start, end, bits, 0, NULL, |
| 896 | mask); |
| 897 | } |
| 898 | EXPORT_SYMBOL(set_extent_bits); |
| 899 | |
| 900 | int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, |
| 901 | int bits, gfp_t mask) |
| 902 | { |
| 903 | return clear_extent_bit(tree, start, end, bits, 0, 0, mask); |
| 904 | } |
| 905 | EXPORT_SYMBOL(clear_extent_bits); |
| 906 | |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 907 | int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end, |
| 908 | gfp_t mask) |
| 909 | { |
| 910 | return set_extent_bit(tree, start, end, |
| 911 | EXTENT_DELALLOC | EXTENT_DIRTY, 0, NULL, |
| 912 | mask); |
| 913 | } |
| 914 | EXPORT_SYMBOL(set_extent_delalloc); |
| 915 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 916 | int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, |
| 917 | gfp_t mask) |
| 918 | { |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 919 | return clear_extent_bit(tree, start, end, |
| 920 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 921 | } |
| 922 | EXPORT_SYMBOL(clear_extent_dirty); |
| 923 | |
| 924 | int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end, |
| 925 | gfp_t mask) |
| 926 | { |
| 927 | return set_extent_bit(tree, start, end, EXTENT_NEW, 0, NULL, |
| 928 | mask); |
| 929 | } |
| 930 | EXPORT_SYMBOL(set_extent_new); |
| 931 | |
| 932 | int clear_extent_new(struct extent_map_tree *tree, u64 start, u64 end, |
| 933 | gfp_t mask) |
| 934 | { |
| 935 | return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0, mask); |
| 936 | } |
| 937 | EXPORT_SYMBOL(clear_extent_new); |
| 938 | |
| 939 | int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, |
| 940 | gfp_t mask) |
| 941 | { |
| 942 | return set_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, NULL, |
| 943 | mask); |
| 944 | } |
| 945 | EXPORT_SYMBOL(set_extent_uptodate); |
| 946 | |
| 947 | int clear_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, |
| 948 | gfp_t mask) |
| 949 | { |
| 950 | return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, mask); |
| 951 | } |
| 952 | EXPORT_SYMBOL(clear_extent_uptodate); |
| 953 | |
| 954 | int set_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, |
| 955 | gfp_t mask) |
| 956 | { |
| 957 | return set_extent_bit(tree, start, end, EXTENT_WRITEBACK, |
| 958 | 0, NULL, mask); |
| 959 | } |
| 960 | EXPORT_SYMBOL(set_extent_writeback); |
| 961 | |
| 962 | int clear_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end, |
| 963 | gfp_t mask) |
| 964 | { |
| 965 | return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0, mask); |
| 966 | } |
| 967 | EXPORT_SYMBOL(clear_extent_writeback); |
| 968 | |
| 969 | int wait_on_extent_writeback(struct extent_map_tree *tree, u64 start, u64 end) |
| 970 | { |
| 971 | return wait_extent_bit(tree, start, end, EXTENT_WRITEBACK); |
| 972 | } |
| 973 | EXPORT_SYMBOL(wait_on_extent_writeback); |
| 974 | |
| 975 | /* |
| 976 | * locks a range in ascending order, waiting for any locked regions |
| 977 | * it hits on the way. [start,end] are inclusive, and this will sleep. |
| 978 | */ |
| 979 | int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask) |
| 980 | { |
| 981 | int err; |
| 982 | u64 failed_start; |
| 983 | while (1) { |
| 984 | err = set_extent_bit(tree, start, end, EXTENT_LOCKED, 1, |
| 985 | &failed_start, mask); |
| 986 | if (err == -EEXIST && (mask & __GFP_WAIT)) { |
| 987 | wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); |
| 988 | start = failed_start; |
| 989 | } else { |
| 990 | break; |
| 991 | } |
| 992 | WARN_ON(start > end); |
| 993 | } |
| 994 | return err; |
| 995 | } |
| 996 | EXPORT_SYMBOL(lock_extent); |
| 997 | |
| 998 | int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, |
| 999 | gfp_t mask) |
| 1000 | { |
| 1001 | return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, mask); |
| 1002 | } |
| 1003 | EXPORT_SYMBOL(unlock_extent); |
| 1004 | |
| 1005 | /* |
| 1006 | * helper function to set pages and extents in the tree dirty |
| 1007 | */ |
| 1008 | int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end) |
| 1009 | { |
| 1010 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
| 1011 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; |
| 1012 | struct page *page; |
| 1013 | |
| 1014 | while (index <= end_index) { |
| 1015 | page = find_get_page(tree->mapping, index); |
| 1016 | BUG_ON(!page); |
| 1017 | __set_page_dirty_nobuffers(page); |
| 1018 | page_cache_release(page); |
| 1019 | index++; |
| 1020 | } |
| 1021 | set_extent_dirty(tree, start, end, GFP_NOFS); |
| 1022 | return 0; |
| 1023 | } |
| 1024 | EXPORT_SYMBOL(set_range_dirty); |
| 1025 | |
| 1026 | /* |
| 1027 | * helper function to set both pages and extents in the tree writeback |
| 1028 | */ |
| 1029 | int set_range_writeback(struct extent_map_tree *tree, u64 start, u64 end) |
| 1030 | { |
| 1031 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
| 1032 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; |
| 1033 | struct page *page; |
| 1034 | |
| 1035 | while (index <= end_index) { |
| 1036 | page = find_get_page(tree->mapping, index); |
| 1037 | BUG_ON(!page); |
| 1038 | set_page_writeback(page); |
| 1039 | page_cache_release(page); |
| 1040 | index++; |
| 1041 | } |
| 1042 | set_extent_writeback(tree, start, end, GFP_NOFS); |
| 1043 | return 0; |
| 1044 | } |
| 1045 | EXPORT_SYMBOL(set_range_writeback); |
| 1046 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1047 | int find_first_extent_bit(struct extent_map_tree *tree, u64 start, |
| 1048 | u64 *start_ret, u64 *end_ret, int bits) |
| 1049 | { |
| 1050 | struct rb_node *node; |
| 1051 | struct extent_state *state; |
| 1052 | int ret = 1; |
| 1053 | |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 1054 | read_lock_irq(&tree->lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1055 | /* |
| 1056 | * this search will find all the extents that end after |
| 1057 | * our range starts. |
| 1058 | */ |
| 1059 | node = tree_search(&tree->state, start); |
| 1060 | if (!node || IS_ERR(node)) { |
| 1061 | goto out; |
| 1062 | } |
| 1063 | |
| 1064 | while(1) { |
| 1065 | state = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 1066 | if (state->end >= start && (state->state & bits)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1067 | *start_ret = state->start; |
| 1068 | *end_ret = state->end; |
| 1069 | ret = 0; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 1070 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1071 | } |
| 1072 | node = rb_next(node); |
| 1073 | if (!node) |
| 1074 | break; |
| 1075 | } |
| 1076 | out: |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 1077 | read_unlock_irq(&tree->lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1078 | return ret; |
| 1079 | } |
| 1080 | EXPORT_SYMBOL(find_first_extent_bit); |
| 1081 | |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1082 | u64 find_lock_delalloc_range(struct extent_map_tree *tree, |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1083 | u64 *start, u64 *end, u64 max_bytes) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1084 | { |
| 1085 | struct rb_node *node; |
| 1086 | struct extent_state *state; |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1087 | u64 cur_start = *start; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1088 | u64 found = 0; |
| 1089 | u64 total_bytes = 0; |
| 1090 | |
| 1091 | write_lock_irq(&tree->lock); |
| 1092 | /* |
| 1093 | * this search will find all the extents that end after |
| 1094 | * our range starts. |
| 1095 | */ |
| 1096 | search_again: |
| 1097 | node = tree_search(&tree->state, cur_start); |
| 1098 | if (!node || IS_ERR(node)) { |
Chris Mason | 190662b | 2007-12-18 16:25:45 -0500 | [diff] [blame] | 1099 | *end = (u64)-1; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1100 | goto out; |
| 1101 | } |
| 1102 | |
| 1103 | while(1) { |
| 1104 | state = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1105 | if (found && state->start != cur_start) { |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1106 | goto out; |
| 1107 | } |
| 1108 | if (!(state->state & EXTENT_DELALLOC)) { |
Chris Mason | 190662b | 2007-12-18 16:25:45 -0500 | [diff] [blame] | 1109 | if (!found) |
| 1110 | *end = state->end; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1111 | goto out; |
| 1112 | } |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1113 | if (!found) { |
| 1114 | struct extent_state *prev_state; |
| 1115 | struct rb_node *prev_node = node; |
| 1116 | while(1) { |
| 1117 | prev_node = rb_prev(prev_node); |
| 1118 | if (!prev_node) |
| 1119 | break; |
| 1120 | prev_state = rb_entry(prev_node, |
| 1121 | struct extent_state, |
| 1122 | rb_node); |
| 1123 | if (!(prev_state->state & EXTENT_DELALLOC)) |
| 1124 | break; |
| 1125 | state = prev_state; |
| 1126 | node = prev_node; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1127 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1128 | } |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1129 | if (state->state & EXTENT_LOCKED) { |
| 1130 | DEFINE_WAIT(wait); |
| 1131 | atomic_inc(&state->refs); |
| 1132 | prepare_to_wait(&state->wq, &wait, |
| 1133 | TASK_UNINTERRUPTIBLE); |
| 1134 | write_unlock_irq(&tree->lock); |
| 1135 | schedule(); |
| 1136 | write_lock_irq(&tree->lock); |
| 1137 | finish_wait(&state->wq, &wait); |
| 1138 | free_extent_state(state); |
| 1139 | goto search_again; |
| 1140 | } |
| 1141 | state->state |= EXTENT_LOCKED; |
| 1142 | if (!found) |
| 1143 | *start = state->start; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1144 | found++; |
| 1145 | *end = state->end; |
| 1146 | cur_start = state->end + 1; |
| 1147 | node = rb_next(node); |
| 1148 | if (!node) |
| 1149 | break; |
Yan | 944746e | 2007-11-01 11:28:42 -0400 | [diff] [blame] | 1150 | total_bytes += state->end - state->start + 1; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1151 | if (total_bytes >= max_bytes) |
| 1152 | break; |
| 1153 | } |
| 1154 | out: |
| 1155 | write_unlock_irq(&tree->lock); |
| 1156 | return found; |
| 1157 | } |
| 1158 | |
Chris Mason | 793955b | 2007-11-26 16:34:41 -0800 | [diff] [blame] | 1159 | u64 count_range_bits(struct extent_map_tree *tree, |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1160 | u64 *start, u64 search_end, u64 max_bytes, |
| 1161 | unsigned long bits) |
Chris Mason | 793955b | 2007-11-26 16:34:41 -0800 | [diff] [blame] | 1162 | { |
| 1163 | struct rb_node *node; |
| 1164 | struct extent_state *state; |
| 1165 | u64 cur_start = *start; |
| 1166 | u64 total_bytes = 0; |
| 1167 | int found = 0; |
| 1168 | |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1169 | if (search_end <= cur_start) { |
| 1170 | printk("search_end %Lu start %Lu\n", search_end, cur_start); |
| 1171 | WARN_ON(1); |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
Chris Mason | 793955b | 2007-11-26 16:34:41 -0800 | [diff] [blame] | 1175 | write_lock_irq(&tree->lock); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1176 | if (cur_start == 0 && bits == EXTENT_DIRTY) { |
Chris Mason | ca66462 | 2007-11-27 11:16:35 -0500 | [diff] [blame] | 1177 | total_bytes = tree->dirty_bytes; |
| 1178 | goto out; |
| 1179 | } |
Chris Mason | 793955b | 2007-11-26 16:34:41 -0800 | [diff] [blame] | 1180 | /* |
| 1181 | * this search will find all the extents that end after |
| 1182 | * our range starts. |
| 1183 | */ |
| 1184 | node = tree_search(&tree->state, cur_start); |
| 1185 | if (!node || IS_ERR(node)) { |
| 1186 | goto out; |
| 1187 | } |
| 1188 | |
| 1189 | while(1) { |
| 1190 | state = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 1191 | if (state->start > search_end) |
| 1192 | break; |
| 1193 | if (state->end >= cur_start && (state->state & bits)) { |
| 1194 | total_bytes += min(search_end, state->end) + 1 - |
| 1195 | max(cur_start, state->start); |
Chris Mason | 793955b | 2007-11-26 16:34:41 -0800 | [diff] [blame] | 1196 | if (total_bytes >= max_bytes) |
| 1197 | break; |
| 1198 | if (!found) { |
| 1199 | *start = state->start; |
| 1200 | found = 1; |
| 1201 | } |
| 1202 | } |
| 1203 | node = rb_next(node); |
| 1204 | if (!node) |
| 1205 | break; |
| 1206 | } |
| 1207 | out: |
| 1208 | write_unlock_irq(&tree->lock); |
| 1209 | return total_bytes; |
| 1210 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1211 | /* |
| 1212 | * helper function to lock both pages and extents in the tree. |
| 1213 | * pages must be locked first. |
| 1214 | */ |
| 1215 | int lock_range(struct extent_map_tree *tree, u64 start, u64 end) |
| 1216 | { |
| 1217 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
| 1218 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; |
| 1219 | struct page *page; |
| 1220 | int err; |
| 1221 | |
| 1222 | while (index <= end_index) { |
| 1223 | page = grab_cache_page(tree->mapping, index); |
| 1224 | if (!page) { |
| 1225 | err = -ENOMEM; |
| 1226 | goto failed; |
| 1227 | } |
| 1228 | if (IS_ERR(page)) { |
| 1229 | err = PTR_ERR(page); |
| 1230 | goto failed; |
| 1231 | } |
| 1232 | index++; |
| 1233 | } |
| 1234 | lock_extent(tree, start, end, GFP_NOFS); |
| 1235 | return 0; |
| 1236 | |
| 1237 | failed: |
| 1238 | /* |
| 1239 | * we failed above in getting the page at 'index', so we undo here |
| 1240 | * up to but not including the page at 'index' |
| 1241 | */ |
| 1242 | end_index = index; |
| 1243 | index = start >> PAGE_CACHE_SHIFT; |
| 1244 | while (index < end_index) { |
| 1245 | page = find_get_page(tree->mapping, index); |
| 1246 | unlock_page(page); |
| 1247 | page_cache_release(page); |
| 1248 | index++; |
| 1249 | } |
| 1250 | return err; |
| 1251 | } |
| 1252 | EXPORT_SYMBOL(lock_range); |
| 1253 | |
| 1254 | /* |
| 1255 | * helper function to unlock both pages and extents in the tree. |
| 1256 | */ |
| 1257 | int unlock_range(struct extent_map_tree *tree, u64 start, u64 end) |
| 1258 | { |
| 1259 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
| 1260 | unsigned long end_index = end >> PAGE_CACHE_SHIFT; |
| 1261 | struct page *page; |
| 1262 | |
| 1263 | while (index <= end_index) { |
| 1264 | page = find_get_page(tree->mapping, index); |
| 1265 | unlock_page(page); |
| 1266 | page_cache_release(page); |
| 1267 | index++; |
| 1268 | } |
| 1269 | unlock_extent(tree, start, end, GFP_NOFS); |
| 1270 | return 0; |
| 1271 | } |
| 1272 | EXPORT_SYMBOL(unlock_range); |
| 1273 | |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1274 | int set_state_private(struct extent_map_tree *tree, u64 start, u64 private) |
| 1275 | { |
| 1276 | struct rb_node *node; |
| 1277 | struct extent_state *state; |
| 1278 | int ret = 0; |
| 1279 | |
| 1280 | write_lock_irq(&tree->lock); |
| 1281 | /* |
| 1282 | * this search will find all the extents that end after |
| 1283 | * our range starts. |
| 1284 | */ |
| 1285 | node = tree_search(&tree->state, start); |
| 1286 | if (!node || IS_ERR(node)) { |
| 1287 | ret = -ENOENT; |
| 1288 | goto out; |
| 1289 | } |
| 1290 | state = rb_entry(node, struct extent_state, rb_node); |
| 1291 | if (state->start != start) { |
| 1292 | ret = -ENOENT; |
| 1293 | goto out; |
| 1294 | } |
| 1295 | state->private = private; |
| 1296 | out: |
| 1297 | write_unlock_irq(&tree->lock); |
| 1298 | return ret; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1299 | } |
| 1300 | |
| 1301 | int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private) |
| 1302 | { |
| 1303 | struct rb_node *node; |
| 1304 | struct extent_state *state; |
| 1305 | int ret = 0; |
| 1306 | |
| 1307 | read_lock_irq(&tree->lock); |
| 1308 | /* |
| 1309 | * this search will find all the extents that end after |
| 1310 | * our range starts. |
| 1311 | */ |
| 1312 | node = tree_search(&tree->state, start); |
| 1313 | if (!node || IS_ERR(node)) { |
| 1314 | ret = -ENOENT; |
| 1315 | goto out; |
| 1316 | } |
| 1317 | state = rb_entry(node, struct extent_state, rb_node); |
| 1318 | if (state->start != start) { |
| 1319 | ret = -ENOENT; |
| 1320 | goto out; |
| 1321 | } |
| 1322 | *private = state->private; |
| 1323 | out: |
| 1324 | read_unlock_irq(&tree->lock); |
| 1325 | return ret; |
| 1326 | } |
| 1327 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1328 | /* |
| 1329 | * searches a range in the state tree for a given mask. |
| 1330 | * If 'filled' == 1, this returns 1 only if ever extent in the tree |
| 1331 | * has the bits set. Otherwise, 1 is returned if any bit in the |
| 1332 | * range is found set. |
| 1333 | */ |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1334 | int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end, |
| 1335 | int bits, int filled) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1336 | { |
| 1337 | struct extent_state *state = NULL; |
| 1338 | struct rb_node *node; |
| 1339 | int bitset = 0; |
| 1340 | |
| 1341 | read_lock_irq(&tree->lock); |
| 1342 | node = tree_search(&tree->state, start); |
| 1343 | while (node && start <= end) { |
| 1344 | state = rb_entry(node, struct extent_state, rb_node); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1345 | |
| 1346 | if (filled && state->start > start) { |
| 1347 | bitset = 0; |
| 1348 | break; |
| 1349 | } |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 1350 | |
| 1351 | if (state->start > end) |
| 1352 | break; |
| 1353 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1354 | if (state->state & bits) { |
| 1355 | bitset = 1; |
| 1356 | if (!filled) |
| 1357 | break; |
| 1358 | } else if (filled) { |
| 1359 | bitset = 0; |
| 1360 | break; |
| 1361 | } |
| 1362 | start = state->end + 1; |
| 1363 | if (start > end) |
| 1364 | break; |
| 1365 | node = rb_next(node); |
Yan | f0c5da1 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1366 | if (!node) { |
| 1367 | if (filled) |
| 1368 | bitset = 0; |
| 1369 | break; |
| 1370 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1371 | } |
| 1372 | read_unlock_irq(&tree->lock); |
| 1373 | return bitset; |
| 1374 | } |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 1375 | EXPORT_SYMBOL(test_range_bit); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1376 | |
| 1377 | /* |
| 1378 | * helper function to set a given page up to date if all the |
| 1379 | * extents in the tree for that page are up to date |
| 1380 | */ |
| 1381 | static int check_page_uptodate(struct extent_map_tree *tree, |
| 1382 | struct page *page) |
| 1383 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1384 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1385 | u64 end = start + PAGE_CACHE_SIZE - 1; |
| 1386 | if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1)) |
| 1387 | SetPageUptodate(page); |
| 1388 | return 0; |
| 1389 | } |
| 1390 | |
| 1391 | /* |
| 1392 | * helper function to unlock a page if all the extents in the tree |
| 1393 | * for that page are unlocked |
| 1394 | */ |
| 1395 | static int check_page_locked(struct extent_map_tree *tree, |
| 1396 | struct page *page) |
| 1397 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1398 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1399 | u64 end = start + PAGE_CACHE_SIZE - 1; |
| 1400 | if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0)) |
| 1401 | unlock_page(page); |
| 1402 | return 0; |
| 1403 | } |
| 1404 | |
| 1405 | /* |
| 1406 | * helper function to end page writeback if all the extents |
| 1407 | * in the tree for that page are done with writeback |
| 1408 | */ |
| 1409 | static int check_page_writeback(struct extent_map_tree *tree, |
| 1410 | struct page *page) |
| 1411 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1412 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1413 | u64 end = start + PAGE_CACHE_SIZE - 1; |
| 1414 | if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0)) |
| 1415 | end_page_writeback(page); |
| 1416 | return 0; |
| 1417 | } |
| 1418 | |
| 1419 | /* lots and lots of room for performance fixes in the end_bio funcs */ |
| 1420 | |
| 1421 | /* |
| 1422 | * after a writepage IO is done, we need to: |
| 1423 | * clear the uptodate bits on error |
| 1424 | * clear the writeback bits in the extent tree for this IO |
| 1425 | * end_page_writeback if the page has no more pending IO |
| 1426 | * |
| 1427 | * Scheduling is not allowed, so the extent state tree is expected |
| 1428 | * to have one and only one object corresponding to this IO. |
| 1429 | */ |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1430 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
| 1431 | static void end_bio_extent_writepage(struct bio *bio, int err) |
| 1432 | #else |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1433 | static int end_bio_extent_writepage(struct bio *bio, |
| 1434 | unsigned int bytes_done, int err) |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1435 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1436 | { |
| 1437 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 1438 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
| 1439 | struct extent_map_tree *tree = bio->bi_private; |
| 1440 | u64 start; |
| 1441 | u64 end; |
| 1442 | int whole_page; |
| 1443 | |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1444 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1445 | if (bio->bi_size) |
| 1446 | return 1; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1447 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1448 | |
| 1449 | do { |
| 1450 | struct page *page = bvec->bv_page; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1451 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
| 1452 | bvec->bv_offset; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1453 | end = start + bvec->bv_len - 1; |
| 1454 | |
| 1455 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) |
| 1456 | whole_page = 1; |
| 1457 | else |
| 1458 | whole_page = 0; |
| 1459 | |
| 1460 | if (--bvec >= bio->bi_io_vec) |
| 1461 | prefetchw(&bvec->bv_page->flags); |
| 1462 | |
| 1463 | if (!uptodate) { |
| 1464 | clear_extent_uptodate(tree, start, end, GFP_ATOMIC); |
| 1465 | ClearPageUptodate(page); |
| 1466 | SetPageError(page); |
| 1467 | } |
| 1468 | clear_extent_writeback(tree, start, end, GFP_ATOMIC); |
| 1469 | |
| 1470 | if (whole_page) |
| 1471 | end_page_writeback(page); |
| 1472 | else |
| 1473 | check_page_writeback(tree, page); |
Christoph Hellwig | 0e2752a | 2007-09-10 20:02:33 -0400 | [diff] [blame] | 1474 | if (tree->ops && tree->ops->writepage_end_io_hook) |
| 1475 | tree->ops->writepage_end_io_hook(page, start, end); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1476 | } while (bvec >= bio->bi_io_vec); |
| 1477 | |
| 1478 | bio_put(bio); |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1479 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1480 | return 0; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1481 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1482 | } |
| 1483 | |
| 1484 | /* |
| 1485 | * after a readpage IO is done, we need to: |
| 1486 | * clear the uptodate bits on error |
| 1487 | * set the uptodate bits if things worked |
| 1488 | * set the page up to date if all extents in the tree are uptodate |
| 1489 | * clear the lock bit in the extent tree |
| 1490 | * unlock the page if there are no other extents locked for it |
| 1491 | * |
| 1492 | * Scheduling is not allowed, so the extent state tree is expected |
| 1493 | * to have one and only one object corresponding to this IO. |
| 1494 | */ |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1495 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
| 1496 | static void end_bio_extent_readpage(struct bio *bio, int err) |
| 1497 | #else |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1498 | static int end_bio_extent_readpage(struct bio *bio, |
| 1499 | unsigned int bytes_done, int err) |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1500 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1501 | { |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1502 | int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1503 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
| 1504 | struct extent_map_tree *tree = bio->bi_private; |
| 1505 | u64 start; |
| 1506 | u64 end; |
| 1507 | int whole_page; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1508 | int ret; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1509 | |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1510 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1511 | if (bio->bi_size) |
| 1512 | return 1; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1513 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1514 | |
| 1515 | do { |
| 1516 | struct page *page = bvec->bv_page; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1517 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
| 1518 | bvec->bv_offset; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1519 | end = start + bvec->bv_len - 1; |
| 1520 | |
| 1521 | if (bvec->bv_offset == 0 && bvec->bv_len == PAGE_CACHE_SIZE) |
| 1522 | whole_page = 1; |
| 1523 | else |
| 1524 | whole_page = 0; |
| 1525 | |
| 1526 | if (--bvec >= bio->bi_io_vec) |
| 1527 | prefetchw(&bvec->bv_page->flags); |
| 1528 | |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1529 | if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) { |
| 1530 | ret = tree->ops->readpage_end_io_hook(page, start, end); |
| 1531 | if (ret) |
| 1532 | uptodate = 0; |
| 1533 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1534 | if (uptodate) { |
| 1535 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); |
| 1536 | if (whole_page) |
| 1537 | SetPageUptodate(page); |
| 1538 | else |
| 1539 | check_page_uptodate(tree, page); |
| 1540 | } else { |
| 1541 | ClearPageUptodate(page); |
| 1542 | SetPageError(page); |
| 1543 | } |
| 1544 | |
| 1545 | unlock_extent(tree, start, end, GFP_ATOMIC); |
| 1546 | |
| 1547 | if (whole_page) |
| 1548 | unlock_page(page); |
| 1549 | else |
| 1550 | check_page_locked(tree, page); |
| 1551 | } while (bvec >= bio->bi_io_vec); |
| 1552 | |
| 1553 | bio_put(bio); |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1554 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1555 | return 0; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1556 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1557 | } |
| 1558 | |
| 1559 | /* |
| 1560 | * IO done from prepare_write is pretty simple, we just unlock |
| 1561 | * the structs in the extent tree when done, and set the uptodate bits |
| 1562 | * as appropriate. |
| 1563 | */ |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1564 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
| 1565 | static void end_bio_extent_preparewrite(struct bio *bio, int err) |
| 1566 | #else |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1567 | static int end_bio_extent_preparewrite(struct bio *bio, |
| 1568 | unsigned int bytes_done, int err) |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1569 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1570 | { |
| 1571 | const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 1572 | struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; |
| 1573 | struct extent_map_tree *tree = bio->bi_private; |
| 1574 | u64 start; |
| 1575 | u64 end; |
| 1576 | |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1577 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1578 | if (bio->bi_size) |
| 1579 | return 1; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1580 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1581 | |
| 1582 | do { |
| 1583 | struct page *page = bvec->bv_page; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1584 | start = ((u64)page->index << PAGE_CACHE_SHIFT) + |
| 1585 | bvec->bv_offset; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1586 | end = start + bvec->bv_len - 1; |
| 1587 | |
| 1588 | if (--bvec >= bio->bi_io_vec) |
| 1589 | prefetchw(&bvec->bv_page->flags); |
| 1590 | |
| 1591 | if (uptodate) { |
| 1592 | set_extent_uptodate(tree, start, end, GFP_ATOMIC); |
| 1593 | } else { |
| 1594 | ClearPageUptodate(page); |
| 1595 | SetPageError(page); |
| 1596 | } |
| 1597 | |
| 1598 | unlock_extent(tree, start, end, GFP_ATOMIC); |
| 1599 | |
| 1600 | } while (bvec >= bio->bi_io_vec); |
| 1601 | |
| 1602 | bio_put(bio); |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1603 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1604 | return 0; |
Jens Axboe | 0a2118d | 2007-10-19 09:23:05 -0400 | [diff] [blame] | 1605 | #endif |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1606 | } |
| 1607 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1608 | static struct bio * |
| 1609 | extent_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, |
| 1610 | gfp_t gfp_flags) |
| 1611 | { |
| 1612 | struct bio *bio; |
| 1613 | |
| 1614 | bio = bio_alloc(gfp_flags, nr_vecs); |
| 1615 | |
| 1616 | if (bio == NULL && (current->flags & PF_MEMALLOC)) { |
| 1617 | while (!bio && (nr_vecs /= 2)) |
| 1618 | bio = bio_alloc(gfp_flags, nr_vecs); |
| 1619 | } |
| 1620 | |
| 1621 | if (bio) { |
| 1622 | bio->bi_bdev = bdev; |
| 1623 | bio->bi_sector = first_sector; |
| 1624 | } |
| 1625 | return bio; |
| 1626 | } |
| 1627 | |
| 1628 | static int submit_one_bio(int rw, struct bio *bio) |
| 1629 | { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1630 | u64 maxsector; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1631 | int ret = 0; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1632 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1633 | bio_get(bio); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1634 | |
| 1635 | maxsector = bio->bi_bdev->bd_inode->i_size >> 9; |
| 1636 | if (maxsector < bio->bi_sector) { |
| 1637 | printk("sector too large max %Lu got %llu\n", maxsector, |
| 1638 | (unsigned long long)bio->bi_sector); |
| 1639 | WARN_ON(1); |
| 1640 | } |
| 1641 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1642 | submit_bio(rw, bio); |
| 1643 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) |
| 1644 | ret = -EOPNOTSUPP; |
| 1645 | bio_put(bio); |
| 1646 | return ret; |
| 1647 | } |
| 1648 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1649 | static int submit_extent_page(int rw, struct extent_map_tree *tree, |
| 1650 | struct page *page, sector_t sector, |
| 1651 | size_t size, unsigned long offset, |
| 1652 | struct block_device *bdev, |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1653 | struct bio **bio_ret, |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1654 | unsigned long max_pages, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1655 | bio_end_io_t end_io_func) |
| 1656 | { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1657 | int ret = 0; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1658 | struct bio *bio; |
| 1659 | int nr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1660 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1661 | if (bio_ret && *bio_ret) { |
| 1662 | bio = *bio_ret; |
| 1663 | if (bio->bi_sector + (bio->bi_size >> 9) != sector || |
| 1664 | bio_add_page(bio, page, size, offset) < size) { |
| 1665 | ret = submit_one_bio(rw, bio); |
| 1666 | bio = NULL; |
| 1667 | } else { |
| 1668 | return 0; |
| 1669 | } |
| 1670 | } |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1671 | nr = min_t(int, max_pages, bio_get_nr_vecs(bdev)); |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1672 | bio = extent_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
| 1673 | if (!bio) { |
| 1674 | printk("failed to allocate bio nr %d\n", nr); |
| 1675 | } |
| 1676 | bio_add_page(bio, page, size, offset); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1677 | bio->bi_end_io = end_io_func; |
| 1678 | bio->bi_private = tree; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1679 | if (bio_ret) { |
| 1680 | *bio_ret = bio; |
| 1681 | } else { |
| 1682 | ret = submit_one_bio(rw, bio); |
| 1683 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1684 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1685 | return ret; |
| 1686 | } |
| 1687 | |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 1688 | void set_page_extent_mapped(struct page *page) |
| 1689 | { |
| 1690 | if (!PagePrivate(page)) { |
| 1691 | SetPagePrivate(page); |
| 1692 | WARN_ON(!page->mapping->a_ops->invalidatepage); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 1693 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 1694 | page_cache_get(page); |
| 1695 | } |
| 1696 | } |
| 1697 | |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 1698 | void set_page_extent_head(struct page *page, unsigned long len) |
| 1699 | { |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 1700 | set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2); |
| 1701 | } |
| 1702 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1703 | /* |
| 1704 | * basic readpage implementation. Locked extent state structs are inserted |
| 1705 | * into the tree that are removed when the IO is done (by the end_io |
| 1706 | * handlers) |
| 1707 | */ |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1708 | static int __extent_read_full_page(struct extent_map_tree *tree, |
| 1709 | struct page *page, |
| 1710 | get_extent_t *get_extent, |
| 1711 | struct bio **bio) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1712 | { |
| 1713 | struct inode *inode = page->mapping->host; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1714 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1715 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
| 1716 | u64 end; |
| 1717 | u64 cur = start; |
| 1718 | u64 extent_offset; |
| 1719 | u64 last_byte = i_size_read(inode); |
| 1720 | u64 block_start; |
| 1721 | u64 cur_end; |
| 1722 | sector_t sector; |
| 1723 | struct extent_map *em; |
| 1724 | struct block_device *bdev; |
| 1725 | int ret; |
| 1726 | int nr = 0; |
| 1727 | size_t page_offset = 0; |
| 1728 | size_t iosize; |
| 1729 | size_t blocksize = inode->i_sb->s_blocksize; |
| 1730 | |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 1731 | set_page_extent_mapped(page); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1732 | |
| 1733 | end = page_end; |
| 1734 | lock_extent(tree, start, end, GFP_NOFS); |
| 1735 | |
| 1736 | while (cur <= end) { |
| 1737 | if (cur >= last_byte) { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1738 | char *userpage; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1739 | iosize = PAGE_CACHE_SIZE - page_offset; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1740 | userpage = kmap_atomic(page, KM_USER0); |
| 1741 | memset(userpage + page_offset, 0, iosize); |
| 1742 | flush_dcache_page(page); |
| 1743 | kunmap_atomic(userpage, KM_USER0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1744 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
| 1745 | GFP_NOFS); |
| 1746 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); |
| 1747 | break; |
| 1748 | } |
| 1749 | em = get_extent(inode, page, page_offset, cur, end, 0); |
| 1750 | if (IS_ERR(em) || !em) { |
| 1751 | SetPageError(page); |
| 1752 | unlock_extent(tree, cur, end, GFP_NOFS); |
| 1753 | break; |
| 1754 | } |
| 1755 | |
| 1756 | extent_offset = cur - em->start; |
| 1757 | BUG_ON(em->end < cur); |
| 1758 | BUG_ON(end < cur); |
| 1759 | |
| 1760 | iosize = min(em->end - cur, end - cur) + 1; |
| 1761 | cur_end = min(em->end, end); |
| 1762 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); |
| 1763 | sector = (em->block_start + extent_offset) >> 9; |
| 1764 | bdev = em->bdev; |
| 1765 | block_start = em->block_start; |
| 1766 | free_extent_map(em); |
| 1767 | em = NULL; |
| 1768 | |
| 1769 | /* we've found a hole, just zero and go on */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1770 | if (block_start == EXTENT_MAP_HOLE) { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1771 | char *userpage; |
| 1772 | userpage = kmap_atomic(page, KM_USER0); |
| 1773 | memset(userpage + page_offset, 0, iosize); |
| 1774 | flush_dcache_page(page); |
| 1775 | kunmap_atomic(userpage, KM_USER0); |
| 1776 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1777 | set_extent_uptodate(tree, cur, cur + iosize - 1, |
| 1778 | GFP_NOFS); |
| 1779 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); |
| 1780 | cur = cur + iosize; |
| 1781 | page_offset += iosize; |
| 1782 | continue; |
| 1783 | } |
| 1784 | /* the get_extent function already copied into the page */ |
| 1785 | if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1)) { |
| 1786 | unlock_extent(tree, cur, cur + iosize - 1, GFP_NOFS); |
| 1787 | cur = cur + iosize; |
| 1788 | page_offset += iosize; |
| 1789 | continue; |
| 1790 | } |
| 1791 | |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1792 | ret = 0; |
| 1793 | if (tree->ops && tree->ops->readpage_io_hook) { |
| 1794 | ret = tree->ops->readpage_io_hook(page, cur, |
| 1795 | cur + iosize - 1); |
| 1796 | } |
| 1797 | if (!ret) { |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1798 | unsigned long nr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
| 1799 | nr -= page->index; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1800 | ret = submit_extent_page(READ, tree, page, |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1801 | sector, iosize, page_offset, |
| 1802 | bdev, bio, nr, |
| 1803 | end_bio_extent_readpage); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1804 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1805 | if (ret) |
| 1806 | SetPageError(page); |
| 1807 | cur = cur + iosize; |
| 1808 | page_offset += iosize; |
| 1809 | nr++; |
| 1810 | } |
| 1811 | if (!nr) { |
| 1812 | if (!PageError(page)) |
| 1813 | SetPageUptodate(page); |
| 1814 | unlock_page(page); |
| 1815 | } |
| 1816 | return 0; |
| 1817 | } |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 1818 | |
| 1819 | int extent_read_full_page(struct extent_map_tree *tree, struct page *page, |
| 1820 | get_extent_t *get_extent) |
| 1821 | { |
| 1822 | struct bio *bio = NULL; |
| 1823 | int ret; |
| 1824 | |
| 1825 | ret = __extent_read_full_page(tree, page, get_extent, &bio); |
| 1826 | if (bio) |
| 1827 | submit_one_bio(READ, bio); |
| 1828 | return ret; |
| 1829 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1830 | EXPORT_SYMBOL(extent_read_full_page); |
| 1831 | |
| 1832 | /* |
| 1833 | * the writepage semantics are similar to regular writepage. extent |
| 1834 | * records are inserted to lock ranges in the tree, and as dirty areas |
| 1835 | * are found, they are marked writeback. Then the lock bits are removed |
| 1836 | * and the end_io handler clears the writeback ranges |
| 1837 | */ |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1838 | static int __extent_writepage(struct page *page, struct writeback_control *wbc, |
| 1839 | void *data) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1840 | { |
| 1841 | struct inode *inode = page->mapping->host; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1842 | struct extent_page_data *epd = data; |
| 1843 | struct extent_map_tree *tree = epd->tree; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1844 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1845 | u64 delalloc_start; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1846 | u64 page_end = start + PAGE_CACHE_SIZE - 1; |
| 1847 | u64 end; |
| 1848 | u64 cur = start; |
| 1849 | u64 extent_offset; |
| 1850 | u64 last_byte = i_size_read(inode); |
| 1851 | u64 block_start; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 1852 | u64 iosize; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1853 | sector_t sector; |
| 1854 | struct extent_map *em; |
| 1855 | struct block_device *bdev; |
| 1856 | int ret; |
| 1857 | int nr = 0; |
| 1858 | size_t page_offset = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1859 | size_t blocksize; |
| 1860 | loff_t i_size = i_size_read(inode); |
| 1861 | unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1862 | u64 nr_delalloc; |
| 1863 | u64 delalloc_end; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1864 | |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1865 | WARN_ON(!PageLocked(page)); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1866 | if (page->index > end_index) { |
| 1867 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); |
| 1868 | unlock_page(page); |
| 1869 | return 0; |
| 1870 | } |
| 1871 | |
| 1872 | if (page->index == end_index) { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1873 | char *userpage; |
| 1874 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1875 | size_t offset = i_size & (PAGE_CACHE_SIZE - 1); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1876 | |
| 1877 | userpage = kmap_atomic(page, KM_USER0); |
| 1878 | memset(userpage + offset, 0, PAGE_CACHE_SIZE - offset); |
| 1879 | flush_dcache_page(page); |
| 1880 | kunmap_atomic(userpage, KM_USER0); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1881 | } |
| 1882 | |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 1883 | set_page_extent_mapped(page); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1884 | |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1885 | delalloc_start = start; |
| 1886 | delalloc_end = 0; |
| 1887 | while(delalloc_end < page_end) { |
| 1888 | nr_delalloc = find_lock_delalloc_range(tree, &delalloc_start, |
| 1889 | &delalloc_end, |
| 1890 | 128 * 1024 * 1024); |
Chris Mason | 190662b | 2007-12-18 16:25:45 -0500 | [diff] [blame] | 1891 | if (nr_delalloc == 0) { |
| 1892 | delalloc_start = delalloc_end + 1; |
| 1893 | continue; |
| 1894 | } |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1895 | tree->ops->fill_delalloc(inode, delalloc_start, |
| 1896 | delalloc_end); |
| 1897 | clear_extent_bit(tree, delalloc_start, |
| 1898 | delalloc_end, |
| 1899 | EXTENT_LOCKED | EXTENT_DELALLOC, |
| 1900 | 1, 0, GFP_NOFS); |
| 1901 | delalloc_start = delalloc_end + 1; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1902 | } |
Chris Mason | 3e9fd94 | 2007-11-20 10:47:25 -0500 | [diff] [blame] | 1903 | lock_extent(tree, start, page_end, GFP_NOFS); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1904 | |
| 1905 | end = page_end; |
| 1906 | if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) { |
| 1907 | printk("found delalloc bits after lock_extent\n"); |
| 1908 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1909 | |
| 1910 | if (last_byte <= start) { |
| 1911 | clear_extent_dirty(tree, start, page_end, GFP_NOFS); |
| 1912 | goto done; |
| 1913 | } |
| 1914 | |
| 1915 | set_extent_uptodate(tree, start, page_end, GFP_NOFS); |
| 1916 | blocksize = inode->i_sb->s_blocksize; |
| 1917 | |
| 1918 | while (cur <= end) { |
| 1919 | if (cur >= last_byte) { |
| 1920 | clear_extent_dirty(tree, cur, page_end, GFP_NOFS); |
| 1921 | break; |
| 1922 | } |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1923 | em = epd->get_extent(inode, page, page_offset, cur, end, 1); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1924 | if (IS_ERR(em) || !em) { |
| 1925 | SetPageError(page); |
| 1926 | break; |
| 1927 | } |
| 1928 | |
| 1929 | extent_offset = cur - em->start; |
| 1930 | BUG_ON(em->end < cur); |
| 1931 | BUG_ON(end < cur); |
| 1932 | iosize = min(em->end - cur, end - cur) + 1; |
| 1933 | iosize = (iosize + blocksize - 1) & ~((u64)blocksize - 1); |
| 1934 | sector = (em->block_start + extent_offset) >> 9; |
| 1935 | bdev = em->bdev; |
| 1936 | block_start = em->block_start; |
| 1937 | free_extent_map(em); |
| 1938 | em = NULL; |
| 1939 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1940 | if (block_start == EXTENT_MAP_HOLE || |
| 1941 | block_start == EXTENT_MAP_INLINE) { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1942 | clear_extent_dirty(tree, cur, |
| 1943 | cur + iosize - 1, GFP_NOFS); |
| 1944 | cur = cur + iosize; |
| 1945 | page_offset += iosize; |
| 1946 | continue; |
| 1947 | } |
| 1948 | |
| 1949 | /* leave this out until we have a page_mkwrite call */ |
| 1950 | if (0 && !test_range_bit(tree, cur, cur + iosize - 1, |
| 1951 | EXTENT_DIRTY, 0)) { |
| 1952 | cur = cur + iosize; |
| 1953 | page_offset += iosize; |
| 1954 | continue; |
| 1955 | } |
| 1956 | clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS); |
Christoph Hellwig | b06355f | 2007-09-10 20:02:32 -0400 | [diff] [blame] | 1957 | if (tree->ops && tree->ops->writepage_io_hook) { |
| 1958 | ret = tree->ops->writepage_io_hook(page, cur, |
| 1959 | cur + iosize - 1); |
| 1960 | } else { |
| 1961 | ret = 0; |
| 1962 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1963 | if (ret) |
| 1964 | SetPageError(page); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1965 | else { |
Chris Mason | 7073c8e | 2007-11-20 13:44:45 -0500 | [diff] [blame] | 1966 | unsigned long max_nr = end_index + 1; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1967 | set_range_writeback(tree, cur, cur + iosize - 1); |
Chris Mason | 7073c8e | 2007-11-20 13:44:45 -0500 | [diff] [blame] | 1968 | if (!PageWriteback(page)) { |
| 1969 | printk("warning page %lu not writeback, " |
| 1970 | "cur %llu end %llu\n", page->index, |
| 1971 | (unsigned long long)cur, |
| 1972 | (unsigned long long)end); |
| 1973 | } |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1974 | |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1975 | ret = submit_extent_page(WRITE, tree, page, sector, |
| 1976 | iosize, page_offset, bdev, |
Chris Mason | 7073c8e | 2007-11-20 13:44:45 -0500 | [diff] [blame] | 1977 | &epd->bio, max_nr, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1978 | end_bio_extent_writepage); |
| 1979 | if (ret) |
| 1980 | SetPageError(page); |
| 1981 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1982 | cur = cur + iosize; |
| 1983 | page_offset += iosize; |
| 1984 | nr++; |
| 1985 | } |
| 1986 | done: |
Chris Mason | 7073c8e | 2007-11-20 13:44:45 -0500 | [diff] [blame] | 1987 | if (nr == 0) { |
| 1988 | /* make sure the mapping tag for page dirty gets cleared */ |
| 1989 | set_page_writeback(page); |
| 1990 | end_page_writeback(page); |
| 1991 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1992 | unlock_extent(tree, start, page_end, GFP_NOFS); |
| 1993 | unlock_page(page); |
| 1994 | return 0; |
| 1995 | } |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 1996 | |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 1997 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
| 1998 | |
| 1999 | /* Taken directly from 2.6.23 for 2.6.18 back port */ |
| 2000 | typedef int (*writepage_t)(struct page *page, struct writeback_control *wbc, |
| 2001 | void *data); |
| 2002 | |
| 2003 | /** |
| 2004 | * write_cache_pages - walk the list of dirty pages of the given address space |
| 2005 | * and write all of them. |
| 2006 | * @mapping: address space structure to write |
| 2007 | * @wbc: subtract the number of written pages from *@wbc->nr_to_write |
| 2008 | * @writepage: function called for each page |
| 2009 | * @data: data passed to writepage function |
| 2010 | * |
| 2011 | * If a page is already under I/O, write_cache_pages() skips it, even |
| 2012 | * if it's dirty. This is desirable behaviour for memory-cleaning writeback, |
| 2013 | * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() |
| 2014 | * and msync() need to guarantee that all the data which was dirty at the time |
| 2015 | * the call was made get new I/O started against them. If wbc->sync_mode is |
| 2016 | * WB_SYNC_ALL then we were called for data integrity and we must wait for |
| 2017 | * existing IO to complete. |
| 2018 | */ |
| 2019 | static int write_cache_pages(struct address_space *mapping, |
| 2020 | struct writeback_control *wbc, writepage_t writepage, |
| 2021 | void *data) |
| 2022 | { |
| 2023 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 2024 | int ret = 0; |
| 2025 | int done = 0; |
| 2026 | struct pagevec pvec; |
| 2027 | int nr_pages; |
| 2028 | pgoff_t index; |
| 2029 | pgoff_t end; /* Inclusive */ |
| 2030 | int scanned = 0; |
| 2031 | int range_whole = 0; |
| 2032 | |
| 2033 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 2034 | wbc->encountered_congestion = 1; |
| 2035 | return 0; |
| 2036 | } |
| 2037 | |
| 2038 | pagevec_init(&pvec, 0); |
| 2039 | if (wbc->range_cyclic) { |
| 2040 | index = mapping->writeback_index; /* Start from prev offset */ |
| 2041 | end = -1; |
| 2042 | } else { |
| 2043 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 2044 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 2045 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 2046 | range_whole = 1; |
| 2047 | scanned = 1; |
| 2048 | } |
| 2049 | retry: |
| 2050 | while (!done && (index <= end) && |
| 2051 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 2052 | PAGECACHE_TAG_DIRTY, |
| 2053 | min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { |
| 2054 | unsigned i; |
| 2055 | |
| 2056 | scanned = 1; |
| 2057 | for (i = 0; i < nr_pages; i++) { |
| 2058 | struct page *page = pvec.pages[i]; |
| 2059 | |
| 2060 | /* |
| 2061 | * At this point we hold neither mapping->tree_lock nor |
| 2062 | * lock on the page itself: the page may be truncated or |
| 2063 | * invalidated (changing page->mapping to NULL), or even |
| 2064 | * swizzled back from swapper_space to tmpfs file |
| 2065 | * mapping |
| 2066 | */ |
| 2067 | lock_page(page); |
| 2068 | |
| 2069 | if (unlikely(page->mapping != mapping)) { |
| 2070 | unlock_page(page); |
| 2071 | continue; |
| 2072 | } |
| 2073 | |
| 2074 | if (!wbc->range_cyclic && page->index > end) { |
| 2075 | done = 1; |
| 2076 | unlock_page(page); |
| 2077 | continue; |
| 2078 | } |
| 2079 | |
| 2080 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 2081 | wait_on_page_writeback(page); |
| 2082 | |
| 2083 | if (PageWriteback(page) || |
| 2084 | !clear_page_dirty_for_io(page)) { |
| 2085 | unlock_page(page); |
| 2086 | continue; |
| 2087 | } |
| 2088 | |
| 2089 | ret = (*writepage)(page, wbc, data); |
| 2090 | |
| 2091 | if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { |
| 2092 | unlock_page(page); |
| 2093 | ret = 0; |
| 2094 | } |
| 2095 | if (ret || (--(wbc->nr_to_write) <= 0)) |
| 2096 | done = 1; |
| 2097 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 2098 | wbc->encountered_congestion = 1; |
| 2099 | done = 1; |
| 2100 | } |
| 2101 | } |
| 2102 | pagevec_release(&pvec); |
| 2103 | cond_resched(); |
| 2104 | } |
| 2105 | if (!scanned && !done) { |
| 2106 | /* |
| 2107 | * We hit the last page and there is more work to be done: wrap |
| 2108 | * back to the start of the file |
| 2109 | */ |
| 2110 | scanned = 1; |
| 2111 | index = 0; |
| 2112 | goto retry; |
| 2113 | } |
| 2114 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
| 2115 | mapping->writeback_index = index; |
| 2116 | return ret; |
| 2117 | } |
| 2118 | #endif |
| 2119 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2120 | int extent_write_full_page(struct extent_map_tree *tree, struct page *page, |
| 2121 | get_extent_t *get_extent, |
| 2122 | struct writeback_control *wbc) |
| 2123 | { |
| 2124 | int ret; |
Chris Mason | 015a739c | 2007-11-26 16:15:16 -0800 | [diff] [blame] | 2125 | struct address_space *mapping = page->mapping; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2126 | struct extent_page_data epd = { |
| 2127 | .bio = NULL, |
| 2128 | .tree = tree, |
| 2129 | .get_extent = get_extent, |
| 2130 | }; |
Chris Mason | 015a739c | 2007-11-26 16:15:16 -0800 | [diff] [blame] | 2131 | struct writeback_control wbc_writepages = { |
| 2132 | .bdi = wbc->bdi, |
| 2133 | .sync_mode = WB_SYNC_NONE, |
| 2134 | .older_than_this = NULL, |
| 2135 | .nr_to_write = 64, |
| 2136 | .range_start = page_offset(page) + PAGE_CACHE_SIZE, |
| 2137 | .range_end = (loff_t)-1, |
| 2138 | }; |
| 2139 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2140 | |
| 2141 | ret = __extent_writepage(page, wbc, &epd); |
Chris Mason | 015a739c | 2007-11-26 16:15:16 -0800 | [diff] [blame] | 2142 | |
| 2143 | write_cache_pages(mapping, &wbc_writepages, __extent_writepage, &epd); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2144 | if (epd.bio) { |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2145 | submit_one_bio(WRITE, epd.bio); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2146 | } |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2147 | return ret; |
| 2148 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2149 | EXPORT_SYMBOL(extent_write_full_page); |
| 2150 | |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2151 | |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2152 | int extent_writepages(struct extent_map_tree *tree, |
| 2153 | struct address_space *mapping, |
| 2154 | get_extent_t *get_extent, |
| 2155 | struct writeback_control *wbc) |
| 2156 | { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2157 | int ret = 0; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2158 | struct extent_page_data epd = { |
| 2159 | .bio = NULL, |
| 2160 | .tree = tree, |
| 2161 | .get_extent = get_extent, |
| 2162 | }; |
| 2163 | |
| 2164 | ret = write_cache_pages(mapping, wbc, __extent_writepage, &epd); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2165 | if (epd.bio) { |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2166 | submit_one_bio(WRITE, epd.bio); |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2167 | } |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2168 | return ret; |
| 2169 | } |
| 2170 | EXPORT_SYMBOL(extent_writepages); |
| 2171 | |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 2172 | int extent_readpages(struct extent_map_tree *tree, |
| 2173 | struct address_space *mapping, |
| 2174 | struct list_head *pages, unsigned nr_pages, |
| 2175 | get_extent_t get_extent) |
| 2176 | { |
| 2177 | struct bio *bio = NULL; |
| 2178 | unsigned page_idx; |
| 2179 | struct pagevec pvec; |
| 2180 | |
| 2181 | pagevec_init(&pvec, 0); |
| 2182 | for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
| 2183 | struct page *page = list_entry(pages->prev, struct page, lru); |
| 2184 | |
| 2185 | prefetchw(&page->flags); |
| 2186 | list_del(&page->lru); |
| 2187 | /* |
| 2188 | * what we want to do here is call add_to_page_cache_lru, |
| 2189 | * but that isn't exported, so we reproduce it here |
| 2190 | */ |
| 2191 | if (!add_to_page_cache(page, mapping, |
| 2192 | page->index, GFP_KERNEL)) { |
| 2193 | |
| 2194 | /* open coding of lru_cache_add, also not exported */ |
| 2195 | page_cache_get(page); |
| 2196 | if (!pagevec_add(&pvec, page)) |
| 2197 | __pagevec_lru_add(&pvec); |
| 2198 | __extent_read_full_page(tree, page, get_extent, &bio); |
| 2199 | } |
| 2200 | page_cache_release(page); |
| 2201 | } |
| 2202 | if (pagevec_count(&pvec)) |
| 2203 | __pagevec_lru_add(&pvec); |
| 2204 | BUG_ON(!list_empty(pages)); |
| 2205 | if (bio) |
| 2206 | submit_one_bio(READ, bio); |
| 2207 | return 0; |
| 2208 | } |
| 2209 | EXPORT_SYMBOL(extent_readpages); |
| 2210 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2211 | /* |
| 2212 | * basic invalidatepage code, this waits on any locked or writeback |
| 2213 | * ranges corresponding to the page, and then deletes any extent state |
| 2214 | * records from the tree |
| 2215 | */ |
| 2216 | int extent_invalidatepage(struct extent_map_tree *tree, |
| 2217 | struct page *page, unsigned long offset) |
| 2218 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 2219 | u64 start = ((u64)page->index << PAGE_CACHE_SHIFT); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2220 | u64 end = start + PAGE_CACHE_SIZE - 1; |
| 2221 | size_t blocksize = page->mapping->host->i_sb->s_blocksize; |
| 2222 | |
| 2223 | start += (offset + blocksize -1) & ~(blocksize - 1); |
| 2224 | if (start > end) |
| 2225 | return 0; |
| 2226 | |
| 2227 | lock_extent(tree, start, end, GFP_NOFS); |
| 2228 | wait_on_extent_writeback(tree, start, end); |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 2229 | clear_extent_bit(tree, start, end, |
| 2230 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2231 | 1, 1, GFP_NOFS); |
| 2232 | return 0; |
| 2233 | } |
| 2234 | EXPORT_SYMBOL(extent_invalidatepage); |
| 2235 | |
| 2236 | /* |
| 2237 | * simple commit_write call, set_range_dirty is used to mark both |
| 2238 | * the pages and the extent records as dirty |
| 2239 | */ |
| 2240 | int extent_commit_write(struct extent_map_tree *tree, |
| 2241 | struct inode *inode, struct page *page, |
| 2242 | unsigned from, unsigned to) |
| 2243 | { |
| 2244 | loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
| 2245 | |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 2246 | set_page_extent_mapped(page); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2247 | set_page_dirty(page); |
| 2248 | |
| 2249 | if (pos > inode->i_size) { |
| 2250 | i_size_write(inode, pos); |
| 2251 | mark_inode_dirty(inode); |
| 2252 | } |
| 2253 | return 0; |
| 2254 | } |
| 2255 | EXPORT_SYMBOL(extent_commit_write); |
| 2256 | |
| 2257 | int extent_prepare_write(struct extent_map_tree *tree, |
| 2258 | struct inode *inode, struct page *page, |
| 2259 | unsigned from, unsigned to, get_extent_t *get_extent) |
| 2260 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 2261 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2262 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 2263 | u64 block_start; |
| 2264 | u64 orig_block_start; |
| 2265 | u64 block_end; |
| 2266 | u64 cur_end; |
| 2267 | struct extent_map *em; |
| 2268 | unsigned blocksize = 1 << inode->i_blkbits; |
| 2269 | size_t page_offset = 0; |
| 2270 | size_t block_off_start; |
| 2271 | size_t block_off_end; |
| 2272 | int err = 0; |
| 2273 | int iocount = 0; |
| 2274 | int ret = 0; |
| 2275 | int isnew; |
| 2276 | |
Christoph Hellwig | b3cfa35 | 2007-09-17 11:25:58 -0400 | [diff] [blame] | 2277 | set_page_extent_mapped(page); |
| 2278 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2279 | block_start = (page_start + from) & ~((u64)blocksize - 1); |
| 2280 | block_end = (page_start + to - 1) | (blocksize - 1); |
| 2281 | orig_block_start = block_start; |
| 2282 | |
| 2283 | lock_extent(tree, page_start, page_end, GFP_NOFS); |
| 2284 | while(block_start <= block_end) { |
| 2285 | em = get_extent(inode, page, page_offset, block_start, |
| 2286 | block_end, 1); |
| 2287 | if (IS_ERR(em) || !em) { |
| 2288 | goto err; |
| 2289 | } |
| 2290 | cur_end = min(block_end, em->end); |
| 2291 | block_off_start = block_start & (PAGE_CACHE_SIZE - 1); |
| 2292 | block_off_end = block_off_start + blocksize; |
| 2293 | isnew = clear_extent_new(tree, block_start, cur_end, GFP_NOFS); |
| 2294 | |
| 2295 | if (!PageUptodate(page) && isnew && |
| 2296 | (block_off_end > to || block_off_start < from)) { |
| 2297 | void *kaddr; |
| 2298 | |
| 2299 | kaddr = kmap_atomic(page, KM_USER0); |
| 2300 | if (block_off_end > to) |
| 2301 | memset(kaddr + to, 0, block_off_end - to); |
| 2302 | if (block_off_start < from) |
| 2303 | memset(kaddr + block_off_start, 0, |
| 2304 | from - block_off_start); |
| 2305 | flush_dcache_page(page); |
| 2306 | kunmap_atomic(kaddr, KM_USER0); |
| 2307 | } |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2308 | if ((em->block_start != EXTENT_MAP_HOLE && |
Chris Mason | 5d4fb73 | 2007-12-21 16:27:23 -0500 | [diff] [blame] | 2309 | em->block_start != EXTENT_MAP_INLINE) && |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 2310 | !isnew && !PageUptodate(page) && |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2311 | (block_off_end > to || block_off_start < from) && |
| 2312 | !test_range_bit(tree, block_start, cur_end, |
| 2313 | EXTENT_UPTODATE, 1)) { |
| 2314 | u64 sector; |
| 2315 | u64 extent_offset = block_start - em->start; |
| 2316 | size_t iosize; |
| 2317 | sector = (em->block_start + extent_offset) >> 9; |
Chris Mason | 5d4fb73 | 2007-12-21 16:27:23 -0500 | [diff] [blame] | 2318 | iosize = (cur_end - block_start + blocksize) & |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2319 | ~((u64)blocksize - 1); |
| 2320 | /* |
| 2321 | * we've already got the extent locked, but we |
| 2322 | * need to split the state such that our end_bio |
| 2323 | * handler can clear the lock. |
| 2324 | */ |
| 2325 | set_extent_bit(tree, block_start, |
| 2326 | block_start + iosize - 1, |
| 2327 | EXTENT_LOCKED, 0, NULL, GFP_NOFS); |
| 2328 | ret = submit_extent_page(READ, tree, page, |
| 2329 | sector, iosize, page_offset, em->bdev, |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 2330 | NULL, 1, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2331 | end_bio_extent_preparewrite); |
| 2332 | iocount++; |
| 2333 | block_start = block_start + iosize; |
| 2334 | } else { |
| 2335 | set_extent_uptodate(tree, block_start, cur_end, |
| 2336 | GFP_NOFS); |
| 2337 | unlock_extent(tree, block_start, cur_end, GFP_NOFS); |
| 2338 | block_start = cur_end + 1; |
| 2339 | } |
| 2340 | page_offset = block_start & (PAGE_CACHE_SIZE - 1); |
| 2341 | free_extent_map(em); |
| 2342 | } |
| 2343 | if (iocount) { |
| 2344 | wait_extent_bit(tree, orig_block_start, |
| 2345 | block_end, EXTENT_LOCKED); |
| 2346 | } |
| 2347 | check_page_uptodate(tree, page); |
| 2348 | err: |
| 2349 | /* FIXME, zero out newly allocated blocks on error */ |
| 2350 | return err; |
| 2351 | } |
| 2352 | EXPORT_SYMBOL(extent_prepare_write); |
| 2353 | |
| 2354 | /* |
| 2355 | * a helper for releasepage. As long as there are no locked extents |
| 2356 | * in the range corresponding to the page, both state records and extent |
| 2357 | * map records are removed |
| 2358 | */ |
| 2359 | int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page) |
| 2360 | { |
| 2361 | struct extent_map *em; |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 2362 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2363 | u64 end = start + PAGE_CACHE_SIZE - 1; |
| 2364 | u64 orig_start = start; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2365 | int ret = 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2366 | |
| 2367 | while (start <= end) { |
| 2368 | em = lookup_extent_mapping(tree, start, end); |
| 2369 | if (!em || IS_ERR(em)) |
| 2370 | break; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2371 | if (!test_range_bit(tree, em->start, em->end, |
| 2372 | EXTENT_LOCKED, 0)) { |
| 2373 | remove_extent_mapping(tree, em); |
| 2374 | /* once for the rb tree */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2375 | free_extent_map(em); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2376 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2377 | start = em->end + 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2378 | /* once for us */ |
| 2379 | free_extent_map(em); |
| 2380 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2381 | if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0)) |
| 2382 | ret = 0; |
| 2383 | else |
| 2384 | clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE, |
| 2385 | 1, 1, GFP_NOFS); |
| 2386 | return ret; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2387 | } |
| 2388 | EXPORT_SYMBOL(try_release_extent_mapping); |
| 2389 | |
Christoph Hellwig | d396c6f | 2007-09-10 20:02:30 -0400 | [diff] [blame] | 2390 | sector_t extent_bmap(struct address_space *mapping, sector_t iblock, |
| 2391 | get_extent_t *get_extent) |
| 2392 | { |
| 2393 | struct inode *inode = mapping->host; |
| 2394 | u64 start = iblock << inode->i_blkbits; |
| 2395 | u64 end = start + (1 << inode->i_blkbits) - 1; |
Yan | c67cda1 | 2007-10-29 11:41:05 -0400 | [diff] [blame] | 2396 | sector_t sector = 0; |
Christoph Hellwig | d396c6f | 2007-09-10 20:02:30 -0400 | [diff] [blame] | 2397 | struct extent_map *em; |
| 2398 | |
| 2399 | em = get_extent(inode, NULL, 0, start, end, 0); |
| 2400 | if (!em || IS_ERR(em)) |
| 2401 | return 0; |
| 2402 | |
Christoph Hellwig | d396c6f | 2007-09-10 20:02:30 -0400 | [diff] [blame] | 2403 | if (em->block_start == EXTENT_MAP_INLINE || |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2404 | em->block_start == EXTENT_MAP_HOLE) |
Yan | c67cda1 | 2007-10-29 11:41:05 -0400 | [diff] [blame] | 2405 | goto out; |
Christoph Hellwig | d396c6f | 2007-09-10 20:02:30 -0400 | [diff] [blame] | 2406 | |
Yan | c67cda1 | 2007-10-29 11:41:05 -0400 | [diff] [blame] | 2407 | sector = (em->block_start + start - em->start) >> inode->i_blkbits; |
| 2408 | out: |
| 2409 | free_extent_map(em); |
| 2410 | return sector; |
Christoph Hellwig | d396c6f | 2007-09-10 20:02:30 -0400 | [diff] [blame] | 2411 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2412 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2413 | static int add_lru(struct extent_map_tree *tree, struct extent_buffer *eb) |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2414 | { |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2415 | if (list_empty(&eb->lru)) { |
| 2416 | extent_buffer_get(eb); |
| 2417 | list_add(&eb->lru, &tree->buffer_lru); |
| 2418 | tree->lru_size++; |
| 2419 | if (tree->lru_size >= BUFFER_LRU_MAX) { |
| 2420 | struct extent_buffer *rm; |
| 2421 | rm = list_entry(tree->buffer_lru.prev, |
| 2422 | struct extent_buffer, lru); |
| 2423 | tree->lru_size--; |
Chris Mason | 856bf3e | 2007-11-08 10:59:05 -0500 | [diff] [blame] | 2424 | list_del_init(&rm->lru); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2425 | free_extent_buffer(rm); |
| 2426 | } |
| 2427 | } else |
| 2428 | list_move(&eb->lru, &tree->buffer_lru); |
| 2429 | return 0; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2430 | } |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2431 | static struct extent_buffer *find_lru(struct extent_map_tree *tree, |
| 2432 | u64 start, unsigned long len) |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2433 | { |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2434 | struct list_head *lru = &tree->buffer_lru; |
| 2435 | struct list_head *cur = lru->next; |
| 2436 | struct extent_buffer *eb; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2437 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2438 | if (list_empty(lru)) |
| 2439 | return NULL; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2440 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2441 | do { |
| 2442 | eb = list_entry(cur, struct extent_buffer, lru); |
| 2443 | if (eb->start == start && eb->len == len) { |
| 2444 | extent_buffer_get(eb); |
| 2445 | return eb; |
| 2446 | } |
| 2447 | cur = cur->next; |
| 2448 | } while (cur != lru); |
| 2449 | return NULL; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2450 | } |
| 2451 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2452 | static inline unsigned long num_extent_pages(u64 start, u64 len) |
| 2453 | { |
| 2454 | return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - |
| 2455 | (start >> PAGE_CACHE_SHIFT); |
| 2456 | } |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2457 | |
| 2458 | static inline struct page *extent_buffer_page(struct extent_buffer *eb, |
| 2459 | unsigned long i) |
| 2460 | { |
| 2461 | struct page *p; |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 2462 | struct address_space *mapping; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2463 | |
| 2464 | if (i == 0) |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2465 | return eb->first_page; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2466 | i += eb->start >> PAGE_CACHE_SHIFT; |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 2467 | mapping = eb->first_page->mapping; |
| 2468 | read_lock_irq(&mapping->tree_lock); |
| 2469 | p = radix_tree_lookup(&mapping->page_tree, i); |
| 2470 | read_unlock_irq(&mapping->tree_lock); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2471 | return p; |
| 2472 | } |
| 2473 | |
| 2474 | static struct extent_buffer *__alloc_extent_buffer(struct extent_map_tree *tree, |
| 2475 | u64 start, |
| 2476 | unsigned long len, |
| 2477 | gfp_t mask) |
| 2478 | { |
| 2479 | struct extent_buffer *eb = NULL; |
| 2480 | |
| 2481 | spin_lock(&tree->lru_lock); |
| 2482 | eb = find_lru(tree, start, len); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2483 | spin_unlock(&tree->lru_lock); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2484 | if (eb) { |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2485 | return eb; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2486 | } |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2487 | |
| 2488 | eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2489 | INIT_LIST_HEAD(&eb->lru); |
| 2490 | eb->start = start; |
| 2491 | eb->len = len; |
| 2492 | atomic_set(&eb->refs, 1); |
| 2493 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2494 | return eb; |
| 2495 | } |
| 2496 | |
| 2497 | static void __free_extent_buffer(struct extent_buffer *eb) |
| 2498 | { |
| 2499 | kmem_cache_free(extent_buffer_cache, eb); |
| 2500 | } |
| 2501 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2502 | struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, |
| 2503 | u64 start, unsigned long len, |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2504 | struct page *page0, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2505 | gfp_t mask) |
| 2506 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2507 | unsigned long num_pages = num_extent_pages(start, len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2508 | unsigned long i; |
| 2509 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
| 2510 | struct extent_buffer *eb; |
| 2511 | struct page *p; |
| 2512 | struct address_space *mapping = tree->mapping; |
Yan | 65555a0 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2513 | int uptodate = 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2514 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2515 | eb = __alloc_extent_buffer(tree, start, len, mask); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2516 | if (!eb || IS_ERR(eb)) |
| 2517 | return NULL; |
| 2518 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2519 | if (eb->flags & EXTENT_BUFFER_FILLED) |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2520 | goto lru_add; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2521 | |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2522 | if (page0) { |
| 2523 | eb->first_page = page0; |
| 2524 | i = 1; |
| 2525 | index++; |
| 2526 | page_cache_get(page0); |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 2527 | mark_page_accessed(page0); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2528 | set_page_extent_mapped(page0); |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2529 | WARN_ON(!PageUptodate(page0)); |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2530 | set_page_extent_head(page0, len); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2531 | } else { |
| 2532 | i = 0; |
| 2533 | } |
| 2534 | for (; i < num_pages; i++, index++) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2535 | p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM); |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2536 | if (!p) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2537 | WARN_ON(1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2538 | goto fail; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2539 | } |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2540 | set_page_extent_mapped(p); |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 2541 | mark_page_accessed(p); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2542 | if (i == 0) { |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2543 | eb->first_page = p; |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2544 | set_page_extent_head(p, len); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2545 | } else { |
| 2546 | set_page_private(p, EXTENT_PAGE_PRIVATE); |
| 2547 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2548 | if (!PageUptodate(p)) |
| 2549 | uptodate = 0; |
| 2550 | unlock_page(p); |
| 2551 | } |
| 2552 | if (uptodate) |
| 2553 | eb->flags |= EXTENT_UPTODATE; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2554 | eb->flags |= EXTENT_BUFFER_FILLED; |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2555 | |
| 2556 | lru_add: |
| 2557 | spin_lock(&tree->lru_lock); |
| 2558 | add_lru(tree, eb); |
| 2559 | spin_unlock(&tree->lru_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2560 | return eb; |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2561 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2562 | fail: |
Chris Mason | 856bf3e | 2007-11-08 10:59:05 -0500 | [diff] [blame] | 2563 | spin_lock(&tree->lru_lock); |
| 2564 | list_del_init(&eb->lru); |
| 2565 | spin_unlock(&tree->lru_lock); |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2566 | if (!atomic_dec_and_test(&eb->refs)) |
| 2567 | return NULL; |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2568 | for (index = 1; index < i; index++) { |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2569 | page_cache_release(extent_buffer_page(eb, index)); |
| 2570 | } |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2571 | if (i > 0) |
| 2572 | page_cache_release(extent_buffer_page(eb, 0)); |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2573 | __free_extent_buffer(eb); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2574 | return NULL; |
| 2575 | } |
| 2576 | EXPORT_SYMBOL(alloc_extent_buffer); |
| 2577 | |
| 2578 | struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, |
| 2579 | u64 start, unsigned long len, |
| 2580 | gfp_t mask) |
| 2581 | { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2582 | unsigned long num_pages = num_extent_pages(start, len); |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2583 | unsigned long i; |
| 2584 | unsigned long index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2585 | struct extent_buffer *eb; |
| 2586 | struct page *p; |
| 2587 | struct address_space *mapping = tree->mapping; |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2588 | int uptodate = 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2589 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2590 | eb = __alloc_extent_buffer(tree, start, len, mask); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2591 | if (!eb || IS_ERR(eb)) |
| 2592 | return NULL; |
| 2593 | |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2594 | if (eb->flags & EXTENT_BUFFER_FILLED) |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2595 | goto lru_add; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2596 | |
| 2597 | for (i = 0; i < num_pages; i++, index++) { |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2598 | p = find_lock_page(mapping, index); |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2599 | if (!p) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2600 | goto fail; |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2601 | } |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2602 | set_page_extent_mapped(p); |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 2603 | mark_page_accessed(p); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2604 | |
| 2605 | if (i == 0) { |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2606 | eb->first_page = p; |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2607 | set_page_extent_head(p, len); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2608 | } else { |
| 2609 | set_page_private(p, EXTENT_PAGE_PRIVATE); |
| 2610 | } |
| 2611 | |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2612 | if (!PageUptodate(p)) |
| 2613 | uptodate = 0; |
| 2614 | unlock_page(p); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2615 | } |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2616 | if (uptodate) |
| 2617 | eb->flags |= EXTENT_UPTODATE; |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2618 | eb->flags |= EXTENT_BUFFER_FILLED; |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2619 | |
| 2620 | lru_add: |
| 2621 | spin_lock(&tree->lru_lock); |
| 2622 | add_lru(tree, eb); |
| 2623 | spin_unlock(&tree->lru_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2624 | return eb; |
| 2625 | fail: |
Chris Mason | 856bf3e | 2007-11-08 10:59:05 -0500 | [diff] [blame] | 2626 | spin_lock(&tree->lru_lock); |
| 2627 | list_del_init(&eb->lru); |
| 2628 | spin_unlock(&tree->lru_lock); |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2629 | if (!atomic_dec_and_test(&eb->refs)) |
| 2630 | return NULL; |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2631 | for (index = 1; index < i; index++) { |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2632 | page_cache_release(extent_buffer_page(eb, index)); |
| 2633 | } |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2634 | if (i > 0) |
| 2635 | page_cache_release(extent_buffer_page(eb, 0)); |
Chris Mason | 09be207 | 2007-11-07 21:08:16 -0500 | [diff] [blame] | 2636 | __free_extent_buffer(eb); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2637 | return NULL; |
| 2638 | } |
| 2639 | EXPORT_SYMBOL(find_extent_buffer); |
| 2640 | |
| 2641 | void free_extent_buffer(struct extent_buffer *eb) |
| 2642 | { |
| 2643 | unsigned long i; |
| 2644 | unsigned long num_pages; |
| 2645 | |
| 2646 | if (!eb) |
| 2647 | return; |
| 2648 | |
| 2649 | if (!atomic_dec_and_test(&eb->refs)) |
| 2650 | return; |
| 2651 | |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2652 | WARN_ON(!list_empty(&eb->lru)); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2653 | num_pages = num_extent_pages(eb->start, eb->len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2654 | |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2655 | for (i = 1; i < num_pages; i++) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2656 | page_cache_release(extent_buffer_page(eb, i)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2657 | } |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2658 | page_cache_release(extent_buffer_page(eb, 0)); |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2659 | __free_extent_buffer(eb); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2660 | } |
| 2661 | EXPORT_SYMBOL(free_extent_buffer); |
| 2662 | |
| 2663 | int clear_extent_buffer_dirty(struct extent_map_tree *tree, |
| 2664 | struct extent_buffer *eb) |
| 2665 | { |
| 2666 | int set; |
| 2667 | unsigned long i; |
| 2668 | unsigned long num_pages; |
| 2669 | struct page *page; |
| 2670 | |
| 2671 | u64 start = eb->start; |
| 2672 | u64 end = start + eb->len - 1; |
| 2673 | |
| 2674 | set = clear_extent_dirty(tree, start, end, GFP_NOFS); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2675 | num_pages = num_extent_pages(eb->start, eb->len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2676 | |
| 2677 | for (i = 0; i < num_pages; i++) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2678 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2679 | lock_page(page); |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2680 | if (i == 0) |
| 2681 | set_page_extent_head(page, eb->len); |
| 2682 | else |
| 2683 | set_page_private(page, EXTENT_PAGE_PRIVATE); |
| 2684 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2685 | /* |
| 2686 | * if we're on the last page or the first page and the |
| 2687 | * block isn't aligned on a page boundary, do extra checks |
| 2688 | * to make sure we don't clean page that is partially dirty |
| 2689 | */ |
| 2690 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || |
| 2691 | ((i == num_pages - 1) && |
Yan | 65555a0 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2692 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 2693 | start = (u64)page->index << PAGE_CACHE_SHIFT; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2694 | end = start + PAGE_CACHE_SIZE - 1; |
| 2695 | if (test_range_bit(tree, start, end, |
| 2696 | EXTENT_DIRTY, 0)) { |
| 2697 | unlock_page(page); |
| 2698 | continue; |
| 2699 | } |
| 2700 | } |
| 2701 | clear_page_dirty_for_io(page); |
Chris Mason | 7073c8e | 2007-11-20 13:44:45 -0500 | [diff] [blame] | 2702 | write_lock_irq(&page->mapping->tree_lock); |
| 2703 | if (!PageDirty(page)) { |
| 2704 | radix_tree_tag_clear(&page->mapping->page_tree, |
| 2705 | page_index(page), |
| 2706 | PAGECACHE_TAG_DIRTY); |
| 2707 | } |
| 2708 | write_unlock_irq(&page->mapping->tree_lock); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2709 | unlock_page(page); |
| 2710 | } |
| 2711 | return 0; |
| 2712 | } |
| 2713 | EXPORT_SYMBOL(clear_extent_buffer_dirty); |
| 2714 | |
| 2715 | int wait_on_extent_buffer_writeback(struct extent_map_tree *tree, |
| 2716 | struct extent_buffer *eb) |
| 2717 | { |
| 2718 | return wait_on_extent_writeback(tree, eb->start, |
| 2719 | eb->start + eb->len - 1); |
| 2720 | } |
| 2721 | EXPORT_SYMBOL(wait_on_extent_buffer_writeback); |
| 2722 | |
| 2723 | int set_extent_buffer_dirty(struct extent_map_tree *tree, |
| 2724 | struct extent_buffer *eb) |
| 2725 | { |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2726 | unsigned long i; |
| 2727 | unsigned long num_pages; |
| 2728 | |
| 2729 | num_pages = num_extent_pages(eb->start, eb->len); |
| 2730 | for (i = 0; i < num_pages; i++) { |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2731 | struct page *page = extent_buffer_page(eb, i); |
| 2732 | /* writepage may need to do something special for the |
| 2733 | * first page, we have to make sure page->private is |
| 2734 | * properly set. releasepage may drop page->private |
| 2735 | * on us if the page isn't already dirty. |
| 2736 | */ |
| 2737 | if (i == 0) { |
| 2738 | lock_page(page); |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 2739 | set_page_extent_head(page, eb->len); |
| 2740 | } else if (PagePrivate(page) && |
| 2741 | page->private != EXTENT_PAGE_PRIVATE) { |
| 2742 | lock_page(page); |
| 2743 | set_page_extent_mapped(page); |
| 2744 | unlock_page(page); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2745 | } |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2746 | __set_page_dirty_nobuffers(extent_buffer_page(eb, i)); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2747 | if (i == 0) |
| 2748 | unlock_page(page); |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2749 | } |
| 2750 | return set_extent_dirty(tree, eb->start, |
| 2751 | eb->start + eb->len - 1, GFP_NOFS); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2752 | } |
| 2753 | EXPORT_SYMBOL(set_extent_buffer_dirty); |
| 2754 | |
| 2755 | int set_extent_buffer_uptodate(struct extent_map_tree *tree, |
| 2756 | struct extent_buffer *eb) |
| 2757 | { |
| 2758 | unsigned long i; |
| 2759 | struct page *page; |
| 2760 | unsigned long num_pages; |
| 2761 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2762 | num_pages = num_extent_pages(eb->start, eb->len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2763 | |
| 2764 | set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1, |
| 2765 | GFP_NOFS); |
| 2766 | for (i = 0; i < num_pages; i++) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2767 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2768 | if ((i == 0 && (eb->start & (PAGE_CACHE_SIZE - 1))) || |
| 2769 | ((i == num_pages - 1) && |
Yan | 65555a0 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2770 | ((eb->start + eb->len) & (PAGE_CACHE_SIZE - 1)))) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2771 | check_page_uptodate(tree, page); |
| 2772 | continue; |
| 2773 | } |
| 2774 | SetPageUptodate(page); |
| 2775 | } |
| 2776 | return 0; |
| 2777 | } |
| 2778 | EXPORT_SYMBOL(set_extent_buffer_uptodate); |
| 2779 | |
| 2780 | int extent_buffer_uptodate(struct extent_map_tree *tree, |
| 2781 | struct extent_buffer *eb) |
| 2782 | { |
| 2783 | if (eb->flags & EXTENT_UPTODATE) |
| 2784 | return 1; |
| 2785 | return test_range_bit(tree, eb->start, eb->start + eb->len - 1, |
| 2786 | EXTENT_UPTODATE, 1); |
| 2787 | } |
| 2788 | EXPORT_SYMBOL(extent_buffer_uptodate); |
| 2789 | |
| 2790 | int read_extent_buffer_pages(struct extent_map_tree *tree, |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2791 | struct extent_buffer *eb, |
| 2792 | u64 start, |
| 2793 | int wait) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2794 | { |
| 2795 | unsigned long i; |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2796 | unsigned long start_i; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2797 | struct page *page; |
| 2798 | int err; |
| 2799 | int ret = 0; |
| 2800 | unsigned long num_pages; |
| 2801 | |
| 2802 | if (eb->flags & EXTENT_UPTODATE) |
| 2803 | return 0; |
| 2804 | |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2805 | if (0 && test_range_bit(tree, eb->start, eb->start + eb->len - 1, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2806 | EXTENT_UPTODATE, 1)) { |
| 2807 | return 0; |
| 2808 | } |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2809 | |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2810 | if (start) { |
| 2811 | WARN_ON(start < eb->start); |
| 2812 | start_i = (start >> PAGE_CACHE_SHIFT) - |
| 2813 | (eb->start >> PAGE_CACHE_SHIFT); |
| 2814 | } else { |
| 2815 | start_i = 0; |
| 2816 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2817 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2818 | num_pages = num_extent_pages(eb->start, eb->len); |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2819 | for (i = start_i; i < num_pages; i++) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2820 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2821 | if (PageUptodate(page)) { |
| 2822 | continue; |
| 2823 | } |
| 2824 | if (!wait) { |
| 2825 | if (TestSetPageLocked(page)) { |
| 2826 | continue; |
| 2827 | } |
| 2828 | } else { |
| 2829 | lock_page(page); |
| 2830 | } |
| 2831 | if (!PageUptodate(page)) { |
| 2832 | err = page->mapping->a_ops->readpage(NULL, page); |
| 2833 | if (err) { |
| 2834 | ret = err; |
| 2835 | } |
| 2836 | } else { |
| 2837 | unlock_page(page); |
| 2838 | } |
| 2839 | } |
| 2840 | |
| 2841 | if (ret || !wait) { |
| 2842 | return ret; |
| 2843 | } |
| 2844 | |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2845 | for (i = start_i; i < num_pages; i++) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2846 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2847 | wait_on_page_locked(page); |
| 2848 | if (!PageUptodate(page)) { |
| 2849 | ret = -EIO; |
| 2850 | } |
| 2851 | } |
Chris Mason | 4dc1190 | 2007-10-15 16:18:14 -0400 | [diff] [blame] | 2852 | if (!ret) |
| 2853 | eb->flags |= EXTENT_UPTODATE; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2854 | return ret; |
| 2855 | } |
| 2856 | EXPORT_SYMBOL(read_extent_buffer_pages); |
| 2857 | |
| 2858 | void read_extent_buffer(struct extent_buffer *eb, void *dstv, |
| 2859 | unsigned long start, |
| 2860 | unsigned long len) |
| 2861 | { |
| 2862 | size_t cur; |
| 2863 | size_t offset; |
| 2864 | struct page *page; |
| 2865 | char *kaddr; |
| 2866 | char *dst = (char *)dstv; |
| 2867 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 2868 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2869 | unsigned long num_pages = num_extent_pages(eb->start, eb->len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2870 | |
| 2871 | WARN_ON(start > eb->len); |
| 2872 | WARN_ON(start + len > eb->start + eb->len); |
| 2873 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 2874 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2875 | |
| 2876 | while(len > 0) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2877 | page = extent_buffer_page(eb, i); |
Chris Mason | 14048ed | 2007-10-15 16:16:28 -0400 | [diff] [blame] | 2878 | if (!PageUptodate(page)) { |
| 2879 | printk("page %lu not up to date i %lu, total %lu, len %lu\n", page->index, i, num_pages, eb->len); |
| 2880 | WARN_ON(1); |
| 2881 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2882 | WARN_ON(!PageUptodate(page)); |
| 2883 | |
| 2884 | cur = min(len, (PAGE_CACHE_SIZE - offset)); |
Chris Mason | 59d169e | 2007-10-19 09:23:09 -0400 | [diff] [blame] | 2885 | kaddr = kmap_atomic(page, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2886 | memcpy(dst, kaddr + offset, cur); |
Chris Mason | 59d169e | 2007-10-19 09:23:09 -0400 | [diff] [blame] | 2887 | kunmap_atomic(kaddr, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2888 | |
| 2889 | dst += cur; |
| 2890 | len -= cur; |
| 2891 | offset = 0; |
| 2892 | i++; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2893 | } |
| 2894 | } |
| 2895 | EXPORT_SYMBOL(read_extent_buffer); |
| 2896 | |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2897 | int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2898 | unsigned long min_len, char **token, char **map, |
| 2899 | unsigned long *map_start, |
| 2900 | unsigned long *map_len, int km) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2901 | { |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 2902 | size_t offset = start & (PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2903 | char *kaddr; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2904 | struct page *p; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2905 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 2906 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
Yan | 65555a0 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2907 | unsigned long end_i = (start_offset + start + min_len - 1) >> |
Chris Mason | 810191f | 2007-10-15 16:18:55 -0400 | [diff] [blame] | 2908 | PAGE_CACHE_SHIFT; |
Chris Mason | 479965d | 2007-10-15 16:14:27 -0400 | [diff] [blame] | 2909 | |
| 2910 | if (i != end_i) |
| 2911 | return -EINVAL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2912 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2913 | if (i == 0) { |
| 2914 | offset = start_offset; |
| 2915 | *map_start = 0; |
| 2916 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2917 | offset = 0; |
Chris Mason | 0591fb5 | 2007-11-11 08:22:00 -0500 | [diff] [blame] | 2918 | *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2919 | } |
Yan | 65555a0 | 2007-10-25 15:42:57 -0400 | [diff] [blame] | 2920 | if (start + min_len > eb->len) { |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2921 | printk("bad mapping eb start %Lu len %lu, wanted %lu %lu\n", eb->start, eb->len, start, min_len); |
| 2922 | WARN_ON(1); |
| 2923 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2924 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2925 | p = extent_buffer_page(eb, i); |
| 2926 | WARN_ON(!PageUptodate(p)); |
| 2927 | kaddr = kmap_atomic(p, km); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2928 | *token = kaddr; |
| 2929 | *map = kaddr + offset; |
| 2930 | *map_len = PAGE_CACHE_SIZE - offset; |
| 2931 | return 0; |
| 2932 | } |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2933 | EXPORT_SYMBOL(map_private_extent_buffer); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2934 | |
| 2935 | int map_extent_buffer(struct extent_buffer *eb, unsigned long start, |
| 2936 | unsigned long min_len, |
| 2937 | char **token, char **map, |
| 2938 | unsigned long *map_start, |
| 2939 | unsigned long *map_len, int km) |
| 2940 | { |
| 2941 | int err; |
| 2942 | int save = 0; |
| 2943 | if (eb->map_token) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2944 | unmap_extent_buffer(eb, eb->map_token, km); |
| 2945 | eb->map_token = NULL; |
| 2946 | save = 1; |
| 2947 | } |
Chris Mason | 19c00dd | 2007-10-15 16:19:22 -0400 | [diff] [blame] | 2948 | err = map_private_extent_buffer(eb, start, min_len, token, map, |
| 2949 | map_start, map_len, km); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2950 | if (!err && save) { |
| 2951 | eb->map_token = *token; |
| 2952 | eb->kaddr = *map; |
| 2953 | eb->map_start = *map_start; |
| 2954 | eb->map_len = *map_len; |
| 2955 | } |
| 2956 | return err; |
| 2957 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2958 | EXPORT_SYMBOL(map_extent_buffer); |
| 2959 | |
| 2960 | void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km) |
| 2961 | { |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 2962 | kunmap_atomic(token, km); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2963 | } |
| 2964 | EXPORT_SYMBOL(unmap_extent_buffer); |
| 2965 | |
| 2966 | int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, |
| 2967 | unsigned long start, |
| 2968 | unsigned long len) |
| 2969 | { |
| 2970 | size_t cur; |
| 2971 | size_t offset; |
| 2972 | struct page *page; |
| 2973 | char *kaddr; |
| 2974 | char *ptr = (char *)ptrv; |
| 2975 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 2976 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
| 2977 | int ret = 0; |
| 2978 | |
| 2979 | WARN_ON(start > eb->len); |
| 2980 | WARN_ON(start + len > eb->start + eb->len); |
| 2981 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 2982 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2983 | |
| 2984 | while(len > 0) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 2985 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2986 | WARN_ON(!PageUptodate(page)); |
| 2987 | |
| 2988 | cur = min(len, (PAGE_CACHE_SIZE - offset)); |
| 2989 | |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 2990 | kaddr = kmap_atomic(page, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2991 | ret = memcmp(ptr, kaddr + offset, cur); |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 2992 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2993 | if (ret) |
| 2994 | break; |
| 2995 | |
| 2996 | ptr += cur; |
| 2997 | len -= cur; |
| 2998 | offset = 0; |
| 2999 | i++; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3000 | } |
| 3001 | return ret; |
| 3002 | } |
| 3003 | EXPORT_SYMBOL(memcmp_extent_buffer); |
| 3004 | |
| 3005 | void write_extent_buffer(struct extent_buffer *eb, const void *srcv, |
| 3006 | unsigned long start, unsigned long len) |
| 3007 | { |
| 3008 | size_t cur; |
| 3009 | size_t offset; |
| 3010 | struct page *page; |
| 3011 | char *kaddr; |
| 3012 | char *src = (char *)srcv; |
| 3013 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 3014 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
| 3015 | |
| 3016 | WARN_ON(start > eb->len); |
| 3017 | WARN_ON(start + len > eb->start + eb->len); |
| 3018 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3019 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3020 | |
| 3021 | while(len > 0) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 3022 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3023 | WARN_ON(!PageUptodate(page)); |
| 3024 | |
| 3025 | cur = min(len, PAGE_CACHE_SIZE - offset); |
Chris Mason | 59d169e | 2007-10-19 09:23:09 -0400 | [diff] [blame] | 3026 | kaddr = kmap_atomic(page, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3027 | memcpy(kaddr + offset, src, cur); |
Chris Mason | 59d169e | 2007-10-19 09:23:09 -0400 | [diff] [blame] | 3028 | kunmap_atomic(kaddr, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3029 | |
| 3030 | src += cur; |
| 3031 | len -= cur; |
| 3032 | offset = 0; |
| 3033 | i++; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3034 | } |
| 3035 | } |
| 3036 | EXPORT_SYMBOL(write_extent_buffer); |
| 3037 | |
| 3038 | void memset_extent_buffer(struct extent_buffer *eb, char c, |
| 3039 | unsigned long start, unsigned long len) |
| 3040 | { |
| 3041 | size_t cur; |
| 3042 | size_t offset; |
| 3043 | struct page *page; |
| 3044 | char *kaddr; |
| 3045 | size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 3046 | unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
| 3047 | |
| 3048 | WARN_ON(start > eb->len); |
| 3049 | WARN_ON(start + len > eb->start + eb->len); |
| 3050 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3051 | offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3052 | |
| 3053 | while(len > 0) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 3054 | page = extent_buffer_page(eb, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3055 | WARN_ON(!PageUptodate(page)); |
| 3056 | |
| 3057 | cur = min(len, PAGE_CACHE_SIZE - offset); |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3058 | kaddr = kmap_atomic(page, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3059 | memset(kaddr + offset, c, cur); |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3060 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3061 | |
| 3062 | len -= cur; |
| 3063 | offset = 0; |
| 3064 | i++; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3065 | } |
| 3066 | } |
| 3067 | EXPORT_SYMBOL(memset_extent_buffer); |
| 3068 | |
| 3069 | void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, |
| 3070 | unsigned long dst_offset, unsigned long src_offset, |
| 3071 | unsigned long len) |
| 3072 | { |
| 3073 | u64 dst_len = dst->len; |
| 3074 | size_t cur; |
| 3075 | size_t offset; |
| 3076 | struct page *page; |
| 3077 | char *kaddr; |
| 3078 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 3079 | unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; |
| 3080 | |
| 3081 | WARN_ON(src->len != dst_len); |
| 3082 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3083 | offset = (start_offset + dst_offset) & |
| 3084 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3085 | |
| 3086 | while(len > 0) { |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 3087 | page = extent_buffer_page(dst, i); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3088 | WARN_ON(!PageUptodate(page)); |
| 3089 | |
| 3090 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); |
| 3091 | |
Chris Mason | ff190c0 | 2007-10-19 10:39:41 -0400 | [diff] [blame] | 3092 | kaddr = kmap_atomic(page, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3093 | read_extent_buffer(src, kaddr + offset, src_offset, cur); |
Chris Mason | ff190c0 | 2007-10-19 10:39:41 -0400 | [diff] [blame] | 3094 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3095 | |
| 3096 | src_offset += cur; |
| 3097 | len -= cur; |
| 3098 | offset = 0; |
| 3099 | i++; |
| 3100 | } |
| 3101 | } |
| 3102 | EXPORT_SYMBOL(copy_extent_buffer); |
| 3103 | |
| 3104 | static void move_pages(struct page *dst_page, struct page *src_page, |
| 3105 | unsigned long dst_off, unsigned long src_off, |
| 3106 | unsigned long len) |
| 3107 | { |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3108 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3109 | if (dst_page == src_page) { |
| 3110 | memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len); |
| 3111 | } else { |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3112 | char *src_kaddr = kmap_atomic(src_page, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3113 | char *p = dst_kaddr + dst_off + len; |
| 3114 | char *s = src_kaddr + src_off + len; |
| 3115 | |
| 3116 | while (len--) |
| 3117 | *--p = *--s; |
| 3118 | |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3119 | kunmap_atomic(src_kaddr, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3120 | } |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3121 | kunmap_atomic(dst_kaddr, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3122 | } |
| 3123 | |
| 3124 | static void copy_pages(struct page *dst_page, struct page *src_page, |
| 3125 | unsigned long dst_off, unsigned long src_off, |
| 3126 | unsigned long len) |
| 3127 | { |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3128 | char *dst_kaddr = kmap_atomic(dst_page, KM_USER0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3129 | char *src_kaddr; |
| 3130 | |
| 3131 | if (dst_page != src_page) |
Chris Mason | ae5252b | 2007-10-15 16:14:41 -0400 | [diff] [blame] | 3132 | src_kaddr = kmap_atomic(src_page, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3133 | else |
| 3134 | src_kaddr = dst_kaddr; |
| 3135 | |
| 3136 | memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3137 | kunmap_atomic(dst_kaddr, KM_USER0); |
| 3138 | if (dst_page != src_page) |
| 3139 | kunmap_atomic(src_kaddr, KM_USER1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3140 | } |
| 3141 | |
| 3142 | void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, |
| 3143 | unsigned long src_offset, unsigned long len) |
| 3144 | { |
| 3145 | size_t cur; |
| 3146 | size_t dst_off_in_page; |
| 3147 | size_t src_off_in_page; |
| 3148 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 3149 | unsigned long dst_i; |
| 3150 | unsigned long src_i; |
| 3151 | |
| 3152 | if (src_offset + len > dst->len) { |
| 3153 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", |
| 3154 | src_offset, len, dst->len); |
| 3155 | BUG_ON(1); |
| 3156 | } |
| 3157 | if (dst_offset + len > dst->len) { |
| 3158 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", |
| 3159 | dst_offset, len, dst->len); |
| 3160 | BUG_ON(1); |
| 3161 | } |
| 3162 | |
| 3163 | while(len > 0) { |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3164 | dst_off_in_page = (start_offset + dst_offset) & |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3165 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3166 | src_off_in_page = (start_offset + src_offset) & |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3167 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
| 3168 | |
| 3169 | dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; |
| 3170 | src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; |
| 3171 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3172 | cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - |
| 3173 | src_off_in_page)); |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 3174 | cur = min_t(unsigned long, cur, |
| 3175 | (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3176 | |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 3177 | copy_pages(extent_buffer_page(dst, dst_i), |
| 3178 | extent_buffer_page(dst, src_i), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3179 | dst_off_in_page, src_off_in_page, cur); |
| 3180 | |
| 3181 | src_offset += cur; |
| 3182 | dst_offset += cur; |
| 3183 | len -= cur; |
| 3184 | } |
| 3185 | } |
| 3186 | EXPORT_SYMBOL(memcpy_extent_buffer); |
| 3187 | |
| 3188 | void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, |
| 3189 | unsigned long src_offset, unsigned long len) |
| 3190 | { |
| 3191 | size_t cur; |
| 3192 | size_t dst_off_in_page; |
| 3193 | size_t src_off_in_page; |
| 3194 | unsigned long dst_end = dst_offset + len - 1; |
| 3195 | unsigned long src_end = src_offset + len - 1; |
| 3196 | size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); |
| 3197 | unsigned long dst_i; |
| 3198 | unsigned long src_i; |
| 3199 | |
| 3200 | if (src_offset + len > dst->len) { |
| 3201 | printk("memmove bogus src_offset %lu move len %lu len %lu\n", |
| 3202 | src_offset, len, dst->len); |
| 3203 | BUG_ON(1); |
| 3204 | } |
| 3205 | if (dst_offset + len > dst->len) { |
| 3206 | printk("memmove bogus dst_offset %lu move len %lu len %lu\n", |
| 3207 | dst_offset, len, dst->len); |
| 3208 | BUG_ON(1); |
| 3209 | } |
| 3210 | if (dst_offset < src_offset) { |
| 3211 | memcpy_extent_buffer(dst, dst_offset, src_offset, len); |
| 3212 | return; |
| 3213 | } |
| 3214 | while(len > 0) { |
| 3215 | dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; |
| 3216 | src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; |
| 3217 | |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3218 | dst_off_in_page = (start_offset + dst_end) & |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3219 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 3685f79 | 2007-10-19 09:23:27 -0400 | [diff] [blame] | 3220 | src_off_in_page = (start_offset + src_end) & |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3221 | ((unsigned long)PAGE_CACHE_SIZE - 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3222 | |
Jens Axboe | ae2f541 | 2007-10-19 09:22:59 -0400 | [diff] [blame] | 3223 | cur = min_t(unsigned long, len, src_off_in_page + 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3224 | cur = min(cur, dst_off_in_page + 1); |
Chris Mason | 6d36dcd | 2007-10-15 16:14:37 -0400 | [diff] [blame] | 3225 | move_pages(extent_buffer_page(dst, dst_i), |
| 3226 | extent_buffer_page(dst, src_i), |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3227 | dst_off_in_page - cur + 1, |
| 3228 | src_off_in_page - cur + 1, cur); |
| 3229 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3230 | dst_end -= cur; |
| 3231 | src_end -= cur; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3232 | len -= cur; |
| 3233 | } |
| 3234 | } |
| 3235 | EXPORT_SYMBOL(memmove_extent_buffer); |