Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/pagelist.c |
| 3 | * |
| 4 | * A set of helper functions for managing NFS read and write requests. |
| 5 | * The main purpose of these routines is to provide support for the |
| 6 | * coalescing of several requests into a single RPC call. |
| 7 | * |
| 8 | * Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no> |
| 9 | * |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/slab.h> |
| 13 | #include <linux/file.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 14 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/clnt.h> |
Trond Myklebust | 1313e60 | 2012-01-17 22:04:24 -0500 | [diff] [blame] | 16 | #include <linux/nfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/nfs3.h> |
| 18 | #include <linux/nfs4.h> |
| 19 | #include <linux/nfs_page.h> |
| 20 | #include <linux/nfs_fs.h> |
| 21 | #include <linux/nfs_mount.h> |
Paul Gortmaker | afeacc8 | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 22 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 24 | #include "internal.h" |
Fred Isaman | bae724e | 2011-03-01 01:34:15 +0000 | [diff] [blame] | 25 | #include "pnfs.h" |
Trond Myklebust | 8d5658c | 2007-04-10 09:26:35 -0400 | [diff] [blame] | 26 | |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 27 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static struct kmem_cache *nfs_page_cachep; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 30 | static const struct rpc_call_ops nfs_pgio_common_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 32 | static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount) |
Fred Isaman | 30dd374 | 2012-04-20 14:47:45 -0400 | [diff] [blame] | 33 | { |
| 34 | p->npages = pagecount; |
| 35 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
| 36 | p->pagevec = p->page_array; |
| 37 | else { |
| 38 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL); |
| 39 | if (!p->pagevec) |
| 40 | p->npages = 0; |
| 41 | } |
| 42 | return p->pagevec != NULL; |
| 43 | } |
| 44 | |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 45 | struct nfs_pgio_mirror * |
| 46 | nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc) |
| 47 | { |
| 48 | return nfs_pgio_has_mirroring(desc) ? |
| 49 | &desc->pg_mirrors[desc->pg_mirror_idx] : |
| 50 | &desc->pg_mirrors[0]; |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror); |
| 53 | |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 54 | void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, |
| 55 | struct nfs_pgio_header *hdr, |
| 56 | void (*release)(struct nfs_pgio_header *hdr)) |
| 57 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 58 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 59 | |
| 60 | |
| 61 | hdr->req = nfs_list_entry(mirror->pg_list.next); |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 62 | hdr->inode = desc->pg_inode; |
| 63 | hdr->cred = hdr->req->wb_context->cred; |
| 64 | hdr->io_start = req_offset(hdr->req); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 65 | hdr->good_bytes = mirror->pg_count; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 66 | hdr->dreq = desc->pg_dreq; |
Peng Tao | f616638 | 2012-08-02 15:36:09 +0300 | [diff] [blame] | 67 | hdr->layout_private = desc->pg_layout_private; |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 68 | hdr->release = release; |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 69 | hdr->completion_ops = desc->pg_completion_ops; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 70 | if (hdr->completion_ops->init_hdr) |
| 71 | hdr->completion_ops->init_hdr(hdr); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 72 | |
| 73 | hdr->pgio_mirror_idx = desc->pg_mirror_idx; |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 74 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 75 | EXPORT_SYMBOL_GPL(nfs_pgheader_init); |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 76 | |
| 77 | void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos) |
| 78 | { |
| 79 | spin_lock(&hdr->lock); |
Trond Myklebust | e9ae58a | 2015-08-17 12:57:07 -0500 | [diff] [blame] | 80 | if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags) |
| 81 | || pos < hdr->io_start + hdr->good_bytes) { |
Fred Isaman | 4db6e0b | 2012-04-20 14:47:46 -0400 | [diff] [blame] | 82 | clear_bit(NFS_IOHDR_EOF, &hdr->flags); |
| 83 | hdr->good_bytes = pos - hdr->io_start; |
| 84 | hdr->error = error; |
| 85 | } |
| 86 | spin_unlock(&hdr->lock); |
| 87 | } |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | static inline struct nfs_page * |
| 90 | nfs_page_alloc(void) |
| 91 | { |
Mel Gorman | 192e501 | 2012-07-31 16:45:16 -0700 | [diff] [blame] | 92 | struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_NOIO); |
Jesper Juhl | 72895b1 | 2010-12-09 23:17:15 +0100 | [diff] [blame] | 93 | if (p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | INIT_LIST_HEAD(&p->wb_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | return p; |
| 96 | } |
| 97 | |
| 98 | static inline void |
| 99 | nfs_page_free(struct nfs_page *p) |
| 100 | { |
| 101 | kmem_cache_free(nfs_page_cachep, p); |
| 102 | } |
| 103 | |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 104 | static void |
| 105 | nfs_iocounter_inc(struct nfs_io_counter *c) |
| 106 | { |
| 107 | atomic_inc(&c->io_count); |
| 108 | } |
| 109 | |
| 110 | static void |
| 111 | nfs_iocounter_dec(struct nfs_io_counter *c) |
| 112 | { |
| 113 | if (atomic_dec_and_test(&c->io_count)) { |
| 114 | clear_bit(NFS_IO_INPROGRESS, &c->flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 115 | smp_mb__after_atomic(); |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 116 | wake_up_bit(&c->flags, NFS_IO_INPROGRESS); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | __nfs_iocounter_wait(struct nfs_io_counter *c) |
| 122 | { |
| 123 | wait_queue_head_t *wq = bit_waitqueue(&c->flags, NFS_IO_INPROGRESS); |
| 124 | DEFINE_WAIT_BIT(q, &c->flags, NFS_IO_INPROGRESS); |
| 125 | int ret = 0; |
| 126 | |
| 127 | do { |
| 128 | prepare_to_wait(wq, &q.wait, TASK_KILLABLE); |
| 129 | set_bit(NFS_IO_INPROGRESS, &c->flags); |
| 130 | if (atomic_read(&c->io_count) == 0) |
| 131 | break; |
NeilBrown | c122132 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 132 | ret = nfs_wait_bit_killable(&q.key); |
David Jeffery | 92a5655 | 2014-08-05 11:19:42 -0400 | [diff] [blame] | 133 | } while (atomic_read(&c->io_count) != 0 && !ret); |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 134 | finish_wait(wq, &q.wait); |
| 135 | return ret; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * nfs_iocounter_wait - wait for i/o to complete |
| 140 | * @c: nfs_io_counter to use |
| 141 | * |
| 142 | * returns -ERESTARTSYS if interrupted by a fatal signal. |
| 143 | * Otherwise returns 0 once the io_count hits 0. |
| 144 | */ |
| 145 | int |
| 146 | nfs_iocounter_wait(struct nfs_io_counter *c) |
| 147 | { |
| 148 | if (atomic_read(&c->io_count) == 0) |
| 149 | return 0; |
| 150 | return __nfs_iocounter_wait(c); |
| 151 | } |
| 152 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 153 | /* |
| 154 | * nfs_page_group_lock - lock the head of the page group |
| 155 | * @req - request in group that is to be locked |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 156 | * @nonblock - if true don't block waiting for lock |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 157 | * |
| 158 | * this lock must be held if modifying the page group list |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 159 | * |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 160 | * return 0 on success, < 0 on error: -EDELAY if nonblocking or the |
| 161 | * result from wait_on_bit_lock |
| 162 | * |
| 163 | * NOTE: calling with nonblock=false should always have set the |
| 164 | * lock bit (see fs/buffer.c and other uses of wait_on_bit_lock |
| 165 | * with TASK_UNINTERRUPTIBLE), so there is no need to check the result. |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 166 | */ |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 167 | int |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 168 | nfs_page_group_lock(struct nfs_page *req, bool nonblock) |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 169 | { |
| 170 | struct nfs_page *head = req->wb_head; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 171 | |
| 172 | WARN_ON_ONCE(head != head->wb_head); |
| 173 | |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 174 | if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags)) |
| 175 | return 0; |
Weston Andros Adamson | e702920 | 2014-07-17 20:42:15 -0400 | [diff] [blame] | 176 | |
Weston Andros Adamson | bc8a309 | 2014-08-08 11:00:54 -0400 | [diff] [blame] | 177 | if (!nonblock) |
| 178 | return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK, |
| 179 | TASK_UNINTERRUPTIBLE); |
| 180 | |
| 181 | return -EAGAIN; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | /* |
Weston Andros Adamson | 7c3af97 | 2014-08-08 11:00:57 -0400 | [diff] [blame] | 185 | * nfs_page_group_lock_wait - wait for the lock to clear, but don't grab it |
| 186 | * @req - a request in the group |
| 187 | * |
| 188 | * This is a blocking call to wait for the group lock to be cleared. |
| 189 | */ |
| 190 | void |
| 191 | nfs_page_group_lock_wait(struct nfs_page *req) |
| 192 | { |
| 193 | struct nfs_page *head = req->wb_head; |
| 194 | |
| 195 | WARN_ON_ONCE(head != head->wb_head); |
| 196 | |
| 197 | wait_on_bit(&head->wb_flags, PG_HEADLOCK, |
| 198 | TASK_UNINTERRUPTIBLE); |
| 199 | } |
| 200 | |
| 201 | /* |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 202 | * nfs_page_group_unlock - unlock the head of the page group |
| 203 | * @req - request in group that is to be unlocked |
| 204 | */ |
| 205 | void |
| 206 | nfs_page_group_unlock(struct nfs_page *req) |
| 207 | { |
| 208 | struct nfs_page *head = req->wb_head; |
| 209 | |
| 210 | WARN_ON_ONCE(head != head->wb_head); |
| 211 | |
Linus Torvalds | d1e1cda | 2014-06-10 15:02:42 -0700 | [diff] [blame] | 212 | smp_mb__before_atomic(); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 213 | clear_bit(PG_HEADLOCK, &head->wb_flags); |
Linus Torvalds | d1e1cda | 2014-06-10 15:02:42 -0700 | [diff] [blame] | 214 | smp_mb__after_atomic(); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 215 | wake_up_bit(&head->wb_flags, PG_HEADLOCK); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * nfs_page_group_sync_on_bit_locked |
| 220 | * |
| 221 | * must be called with page group lock held |
| 222 | */ |
| 223 | static bool |
| 224 | nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit) |
| 225 | { |
| 226 | struct nfs_page *head = req->wb_head; |
| 227 | struct nfs_page *tmp; |
| 228 | |
| 229 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags)); |
| 230 | WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags)); |
| 231 | |
| 232 | tmp = req->wb_this_page; |
| 233 | while (tmp != req) { |
| 234 | if (!test_bit(bit, &tmp->wb_flags)) |
| 235 | return false; |
| 236 | tmp = tmp->wb_this_page; |
| 237 | } |
| 238 | |
| 239 | /* true! reset all bits */ |
| 240 | tmp = req; |
| 241 | do { |
| 242 | clear_bit(bit, &tmp->wb_flags); |
| 243 | tmp = tmp->wb_this_page; |
| 244 | } while (tmp != req); |
| 245 | |
| 246 | return true; |
| 247 | } |
| 248 | |
| 249 | /* |
| 250 | * nfs_page_group_sync_on_bit - set bit on current request, but only |
| 251 | * return true if the bit is set for all requests in page group |
| 252 | * @req - request in page group |
| 253 | * @bit - PG_* bit that is used to sync page group |
| 254 | */ |
| 255 | bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit) |
| 256 | { |
| 257 | bool ret; |
| 258 | |
Weston Andros Adamson | fd2f3a0 | 2014-08-08 11:00:53 -0400 | [diff] [blame] | 259 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 260 | ret = nfs_page_group_sync_on_bit_locked(req, bit); |
| 261 | nfs_page_group_unlock(req); |
| 262 | |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * nfs_page_group_init - Initialize the page group linkage for @req |
| 268 | * @req - a new nfs request |
| 269 | * @prev - the previous request in page group, or NULL if @req is the first |
| 270 | * or only request in the group (the head). |
| 271 | */ |
| 272 | static inline void |
| 273 | nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev) |
| 274 | { |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 275 | struct inode *inode; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 276 | WARN_ON_ONCE(prev == req); |
| 277 | |
| 278 | if (!prev) { |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 279 | /* a head request */ |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 280 | req->wb_head = req; |
| 281 | req->wb_this_page = req; |
| 282 | } else { |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 283 | /* a subrequest */ |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 284 | WARN_ON_ONCE(prev->wb_this_page != prev->wb_head); |
| 285 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags)); |
| 286 | req->wb_head = prev->wb_head; |
| 287 | req->wb_this_page = prev->wb_this_page; |
| 288 | prev->wb_this_page = req; |
| 289 | |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 290 | /* All subrequests take a ref on the head request until |
| 291 | * nfs_page_group_destroy is called */ |
| 292 | kref_get(&req->wb_head->wb_kref); |
| 293 | |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 294 | /* grab extra ref and bump the request count if head request |
| 295 | * has extra ref from the write/commit path to handle handoff |
| 296 | * between write and commit lists. */ |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 297 | if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) { |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 298 | inode = page_file_mapping(req->wb_page)->host; |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 299 | set_bit(PG_INODE_REF, &req->wb_flags); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 300 | kref_get(&req->wb_kref); |
Weston Andros Adamson | cb1410c | 2014-11-12 12:08:00 -0500 | [diff] [blame] | 301 | spin_lock(&inode->i_lock); |
| 302 | NFS_I(inode)->nrequests++; |
| 303 | spin_unlock(&inode->i_lock); |
Weston Andros Adamson | 17089a2 | 2014-07-11 10:20:45 -0400 | [diff] [blame] | 304 | } |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * nfs_page_group_destroy - sync the destruction of page groups |
| 310 | * @req - request that no longer needs the page group |
| 311 | * |
| 312 | * releases the page group reference from each member once all |
| 313 | * members have called this function. |
| 314 | */ |
| 315 | static void |
| 316 | nfs_page_group_destroy(struct kref *kref) |
| 317 | { |
| 318 | struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref); |
| 319 | struct nfs_page *tmp, *next; |
| 320 | |
Weston Andros Adamson | 85710a8 | 2014-07-11 10:20:46 -0400 | [diff] [blame] | 321 | /* subrequests must release the ref on the head request */ |
| 322 | if (req->wb_head != req) |
| 323 | nfs_release_request(req->wb_head); |
| 324 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 325 | if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN)) |
| 326 | return; |
| 327 | |
| 328 | tmp = req; |
| 329 | do { |
| 330 | next = tmp->wb_this_page; |
| 331 | /* unlink and free */ |
| 332 | tmp->wb_this_page = tmp; |
| 333 | tmp->wb_head = tmp; |
| 334 | nfs_free_request(tmp); |
| 335 | tmp = next; |
| 336 | } while (tmp != req); |
| 337 | } |
| 338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | /** |
| 340 | * nfs_create_request - Create an NFS read/write request. |
Chuck Lever | c02f557 | 2011-10-25 12:17:43 -0400 | [diff] [blame] | 341 | * @ctx: open context to use |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | * @page: page to write |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 343 | * @last: last nfs request created for this page group or NULL if head |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | * @offset: starting offset within the page for the write |
| 345 | * @count: number of bytes to read/write |
| 346 | * |
| 347 | * The page must be locked by the caller. This makes sure we never |
Jason Uhlenkott | a19b89c | 2007-04-26 17:25:51 -0700 | [diff] [blame] | 348 | * create two different requests for the same page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | * User should ensure it is safe to sleep in this function. |
| 350 | */ |
| 351 | struct nfs_page * |
Weston Andros Adamson | 8c8f1ac1 | 2014-05-15 11:56:42 -0400 | [diff] [blame] | 352 | nfs_create_request(struct nfs_open_context *ctx, struct page *page, |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 353 | struct nfs_page *last, unsigned int offset, |
| 354 | unsigned int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | struct nfs_page *req; |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 357 | struct nfs_lock_context *l_ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Trond Myklebust | c58c844 | 2013-03-18 19:45:14 -0400 | [diff] [blame] | 359 | if (test_bit(NFS_CONTEXT_BAD, &ctx->flags)) |
| 360 | return ERR_PTR(-EBADF); |
Trond Myklebust | 18eb884 | 2010-05-13 12:51:02 -0400 | [diff] [blame] | 361 | /* try to allocate the request struct */ |
| 362 | req = nfs_page_alloc(); |
| 363 | if (req == NULL) |
| 364 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 366 | /* get lock context early so we can deal with alloc failures */ |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 367 | l_ctx = nfs_get_lock_context(ctx); |
| 368 | if (IS_ERR(l_ctx)) { |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 369 | nfs_page_free(req); |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 370 | return ERR_CAST(l_ctx); |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 371 | } |
Trond Myklebust | b3c54de | 2012-08-13 17:15:50 -0400 | [diff] [blame] | 372 | req->wb_lock_context = l_ctx; |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 373 | nfs_iocounter_inc(&l_ctx->io_count); |
Jeff Layton | 015f021 | 2010-10-28 10:10:37 -0400 | [diff] [blame] | 374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | /* Initialize the request struct. Initially, we assume a |
| 376 | * long write-back delay. This will be adjusted in |
| 377 | * update_nfs_request below if the region is not locked. */ |
| 378 | req->wb_page = page; |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 379 | req->wb_index = page_file_index(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | page_cache_get(page); |
| 381 | req->wb_offset = offset; |
| 382 | req->wb_pgbase = offset; |
| 383 | req->wb_bytes = count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | req->wb_context = get_nfs_open_context(ctx); |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 385 | kref_init(&req->wb_kref); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 386 | nfs_page_group_init(req, last); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | return req; |
| 388 | } |
| 389 | |
| 390 | /** |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 391 | * nfs_unlock_request - Unlock request and wake up sleepers. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * @req: |
| 393 | */ |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 394 | void nfs_unlock_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
| 396 | if (!NFS_WBACK_BUSY(req)) { |
| 397 | printk(KERN_ERR "NFS: Invalid unlock attempted\n"); |
| 398 | BUG(); |
| 399 | } |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 400 | smp_mb__before_atomic(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | clear_bit(PG_BUSY, &req->wb_flags); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 402 | smp_mb__after_atomic(); |
Trond Myklebust | 464a98b | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 403 | wake_up_bit(&req->wb_flags, PG_BUSY); |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | /** |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 407 | * nfs_unlock_and_release_request - Unlock request and release the nfs_page |
| 408 | * @req: |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 409 | */ |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 410 | void nfs_unlock_and_release_request(struct nfs_page *req) |
Trond Myklebust | 3aff4eb | 2012-05-09 14:30:35 -0400 | [diff] [blame] | 411 | { |
Trond Myklebust | 1d1afcb | 2012-05-09 14:04:55 -0400 | [diff] [blame] | 412 | nfs_unlock_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | nfs_release_request(req); |
| 414 | } |
| 415 | |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 416 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | * nfs_clear_request - Free up all resources allocated to the request |
| 418 | * @req: |
| 419 | * |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 420 | * Release page and open context resources associated with a read/write |
| 421 | * request after it has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | */ |
Trond Myklebust | 4d65c52 | 2011-03-25 14:15:11 -0400 | [diff] [blame] | 423 | static void nfs_clear_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 425 | struct page *page = req->wb_page; |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 426 | struct nfs_open_context *ctx = req->wb_context; |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 427 | struct nfs_lock_context *l_ctx = req->wb_lock_context; |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 428 | |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 429 | if (page != NULL) { |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 430 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | req->wb_page = NULL; |
| 432 | } |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 433 | if (l_ctx != NULL) { |
Trond Myklebust | 577b423 | 2013-04-08 21:38:12 -0400 | [diff] [blame] | 434 | nfs_iocounter_dec(&l_ctx->io_count); |
Trond Myklebust | f11ac8d | 2010-06-25 16:35:53 -0400 | [diff] [blame] | 435 | nfs_put_lock_context(l_ctx); |
| 436 | req->wb_lock_context = NULL; |
| 437 | } |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 438 | if (ctx != NULL) { |
| 439 | put_nfs_open_context(ctx); |
| 440 | req->wb_context = NULL; |
| 441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | /** |
| 445 | * nfs_release_request - Release the count on an NFS read/write request |
| 446 | * @req: request to release |
| 447 | * |
| 448 | * Note: Should never be called with the spinlock held! |
| 449 | */ |
Weston Andros Adamson | d458138 | 2014-07-11 10:20:48 -0400 | [diff] [blame] | 450 | void nfs_free_request(struct nfs_page *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 452 | WARN_ON_ONCE(req->wb_this_page != req); |
| 453 | |
| 454 | /* extra debug: make sure no sync bits are still set */ |
| 455 | WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); |
Weston Andros Adamson | 67d0338 | 2014-05-15 11:56:46 -0400 | [diff] [blame] | 456 | WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags)); |
| 457 | WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags)); |
Weston Andros Adamson | 20633f0 | 2014-05-15 11:56:47 -0400 | [diff] [blame] | 458 | WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags)); |
| 459 | WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Trond Myklebust | bb6fbc4 | 2010-03-11 09:19:35 -0500 | [diff] [blame] | 461 | /* Release struct file and open context */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | nfs_clear_request(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | nfs_page_free(req); |
| 464 | } |
| 465 | |
Trond Myklebust | c03b402 | 2007-06-17 13:26:38 -0400 | [diff] [blame] | 466 | void nfs_release_request(struct nfs_page *req) |
| 467 | { |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 468 | kref_put(&req->wb_kref, nfs_page_group_destroy); |
Trond Myklebust | 9f557cd | 2010-02-03 08:27:22 -0500 | [diff] [blame] | 469 | } |
| 470 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | /** |
| 472 | * nfs_wait_on_request - Wait for a request to complete. |
| 473 | * @req: request to wait upon. |
| 474 | * |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 475 | * Interruptible by fatal signals only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | * The user is responsible for holding a count on the request. |
| 477 | */ |
| 478 | int |
| 479 | nfs_wait_on_request(struct nfs_page *req) |
| 480 | { |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 481 | return wait_on_bit_io(&req->wb_flags, PG_BUSY, |
| 482 | TASK_UNINTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 485 | /* |
| 486 | * nfs_generic_pg_test - determine if requests can be coalesced |
| 487 | * @desc: pointer to descriptor |
| 488 | * @prev: previous request in desc, or NULL |
| 489 | * @req: this request |
| 490 | * |
| 491 | * Returns zero if @req can be coalesced into @desc, otherwise it returns |
| 492 | * the size of the request. |
| 493 | */ |
| 494 | size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, |
| 495 | struct nfs_page *prev, struct nfs_page *req) |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 496 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 497 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 498 | |
| 499 | |
| 500 | if (mirror->pg_count > mirror->pg_bsize) { |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 501 | /* should never happen */ |
| 502 | WARN_ON_ONCE(1); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 503 | return 0; |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 504 | } |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 505 | |
Christoph Hellwig | 2e11f82 | 2014-08-21 11:09:17 -0500 | [diff] [blame] | 506 | /* |
| 507 | * Limit the request size so that we can still allocate a page array |
| 508 | * for it without upsetting the slab allocator. |
| 509 | */ |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 510 | if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) * |
Peng Tao | 048883e | 2015-09-11 11:14:06 +0800 | [diff] [blame] | 511 | sizeof(struct page *) > PAGE_SIZE) |
Christoph Hellwig | 2e11f82 | 2014-08-21 11:09:17 -0500 | [diff] [blame] | 512 | return 0; |
| 513 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 514 | return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 515 | } |
Benny Halevy | 19345cb | 2011-06-19 18:33:46 -0400 | [diff] [blame] | 516 | EXPORT_SYMBOL_GPL(nfs_generic_pg_test); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 517 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 518 | struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops) |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 519 | { |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 520 | struct nfs_pgio_header *hdr = ops->rw_alloc_header(); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 521 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 522 | if (hdr) { |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 523 | INIT_LIST_HEAD(&hdr->pages); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 524 | spin_lock_init(&hdr->lock); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 525 | hdr->rw_ops = ops; |
| 526 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 527 | return hdr; |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 528 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 529 | EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 530 | |
| 531 | /* |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 532 | * nfs_pgio_header_free - Free a read or write header |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 533 | * @hdr: The header to free |
| 534 | */ |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 535 | void nfs_pgio_header_free(struct nfs_pgio_header *hdr) |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 536 | { |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 537 | hdr->rw_ops->rw_free_header(hdr); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 538 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 539 | EXPORT_SYMBOL_GPL(nfs_pgio_header_free); |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 540 | |
| 541 | /** |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 542 | * nfs_pgio_data_destroy - make @hdr suitable for reuse |
| 543 | * |
| 544 | * Frees memory and releases refs from nfs_generic_pgio, so that it may |
| 545 | * be called again. |
| 546 | * |
| 547 | * @hdr: A header that has had nfs_generic_pgio called |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 548 | */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 549 | void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr) |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 550 | { |
Trond Myklebust | 3caa0c6 | 2014-10-13 10:26:43 -0400 | [diff] [blame] | 551 | if (hdr->args.context) |
| 552 | put_nfs_open_context(hdr->args.context); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 553 | if (hdr->page_array.pagevec != hdr->page_array.page_array) |
| 554 | kfree(hdr->page_array.pagevec); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 555 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 556 | EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy); |
Anna Schumaker | 00bfa30 | 2014-05-06 09:12:29 -0400 | [diff] [blame] | 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | /** |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 559 | * nfs_pgio_rpcsetup - Set up arguments for a pageio call |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 560 | * @hdr: The pageio hdr |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 561 | * @count: Number of bytes to read |
| 562 | * @offset: Initial offset |
| 563 | * @how: How to commit data (writes only) |
| 564 | * @cinfo: Commit information for the call (writes only) |
| 565 | */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 566 | static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr, |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 567 | unsigned int count, unsigned int offset, |
| 568 | int how, struct nfs_commit_info *cinfo) |
| 569 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 570 | struct nfs_page *req = hdr->req; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 571 | |
| 572 | /* Set up the RPC argument and reply structs |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 573 | * NB: take care not to mess about with hdr->commit et al. */ |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 574 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 575 | hdr->args.fh = NFS_FH(hdr->inode); |
| 576 | hdr->args.offset = req_offset(req) + offset; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 577 | /* pnfs_set_layoutcommit needs this */ |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 578 | hdr->mds_offset = hdr->args.offset; |
| 579 | hdr->args.pgbase = req->wb_pgbase + offset; |
| 580 | hdr->args.pages = hdr->page_array.pagevec; |
| 581 | hdr->args.count = count; |
| 582 | hdr->args.context = get_nfs_open_context(req->wb_context); |
| 583 | hdr->args.lock_context = req->wb_lock_context; |
| 584 | hdr->args.stable = NFS_UNSTABLE; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 585 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
| 586 | case 0: |
| 587 | break; |
| 588 | case FLUSH_COND_STABLE: |
| 589 | if (nfs_reqs_to_commit(cinfo)) |
| 590 | break; |
| 591 | default: |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 592 | hdr->args.stable = NFS_FILE_SYNC; |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 593 | } |
| 594 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 595 | hdr->res.fattr = &hdr->fattr; |
| 596 | hdr->res.count = count; |
| 597 | hdr->res.eof = 0; |
Weston Andros Adamson | c65e625 | 2014-06-09 11:48:36 -0400 | [diff] [blame] | 598 | hdr->res.verf = &hdr->verf; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 599 | nfs_fattr_init(&hdr->fattr); |
Anna Schumaker | ce59515 | 2014-05-06 09:12:34 -0400 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | /** |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 603 | * nfs_pgio_prepare - Prepare pageio hdr to go over the wire |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 604 | * @task: The current task |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 605 | * @calldata: pageio header to prepare |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 606 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 607 | static void nfs_pgio_prepare(struct rpc_task *task, void *calldata) |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 608 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 609 | struct nfs_pgio_header *hdr = calldata; |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 610 | int err; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 611 | err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr); |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 612 | if (err) |
| 613 | rpc_exit(task, err); |
| 614 | } |
| 615 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 616 | int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 617 | struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 618 | const struct rpc_call_ops *call_ops, int how, int flags) |
| 619 | { |
| 620 | struct rpc_task *task; |
| 621 | struct rpc_message msg = { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 622 | .rpc_argp = &hdr->args, |
| 623 | .rpc_resp = &hdr->res, |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 624 | .rpc_cred = cred, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 625 | }; |
| 626 | struct rpc_task_setup task_setup_data = { |
| 627 | .rpc_client = clnt, |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 628 | .task = &hdr->task, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 629 | .rpc_message = &msg, |
| 630 | .callback_ops = call_ops, |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 631 | .callback_data = hdr, |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 632 | .workqueue = nfsiod_workqueue, |
| 633 | .flags = RPC_TASK_ASYNC | flags, |
| 634 | }; |
| 635 | int ret = 0; |
| 636 | |
Tom Haynes | abde71f | 2014-06-09 13:12:20 -0700 | [diff] [blame] | 637 | hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how); |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 638 | |
Kinglong Mee | b4839eb | 2015-07-01 12:00:13 +0800 | [diff] [blame] | 639 | dprintk("NFS: initiated pgio call " |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 640 | "(req %s/%llu, %u bytes @ offset %llu)\n", |
Anna Schumaker | 343ae53 | 2014-06-20 13:30:26 -0400 | [diff] [blame] | 641 | hdr->inode->i_sb->s_id, |
| 642 | (unsigned long long)NFS_FILEID(hdr->inode), |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 643 | hdr->args.count, |
| 644 | (unsigned long long)hdr->args.offset); |
Anna Schumaker | 1ed26f3 | 2014-05-06 09:12:37 -0400 | [diff] [blame] | 645 | |
| 646 | task = rpc_run_task(&task_setup_data); |
| 647 | if (IS_ERR(task)) { |
| 648 | ret = PTR_ERR(task); |
| 649 | goto out; |
| 650 | } |
| 651 | if (how & FLUSH_SYNC) { |
| 652 | ret = rpc_wait_for_completion_task(task); |
| 653 | if (ret == 0) |
| 654 | ret = task->tk_status; |
| 655 | } |
| 656 | rpc_put_task(task); |
| 657 | out: |
| 658 | return ret; |
| 659 | } |
| 660 | EXPORT_SYMBOL_GPL(nfs_initiate_pgio); |
| 661 | |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 662 | /** |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 663 | * nfs_pgio_error - Clean up from a pageio error |
| 664 | * @desc: IO descriptor |
| 665 | * @hdr: pageio header |
| 666 | */ |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 667 | static int nfs_pgio_error(struct nfs_pageio_descriptor *desc, |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 668 | struct nfs_pgio_header *hdr) |
| 669 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 670 | struct nfs_pgio_mirror *mirror; |
| 671 | u32 midx; |
| 672 | |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 673 | set_bit(NFS_IOHDR_REDO, &hdr->flags); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 674 | nfs_pgio_data_destroy(hdr); |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 675 | hdr->completion_ops->completion(hdr); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 676 | /* TODO: Make sure it's right to clean up all mirrors here |
| 677 | * and not just hdr->pgio_mirror_idx */ |
| 678 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 679 | mirror = &desc->pg_mirrors[midx]; |
| 680 | desc->pg_completion_ops->error_cleanup(&mirror->pg_list); |
| 681 | } |
Anna Schumaker | 844c9e6 | 2014-05-06 09:12:35 -0400 | [diff] [blame] | 682 | return -ENOMEM; |
| 683 | } |
| 684 | |
| 685 | /** |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 686 | * nfs_pgio_release - Release pageio data |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 687 | * @calldata: The pageio header to release |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 688 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 689 | static void nfs_pgio_release(void *calldata) |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 690 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 691 | struct nfs_pgio_header *hdr = calldata; |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 692 | nfs_pgio_data_destroy(hdr); |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 693 | hdr->completion_ops->completion(hdr); |
Anna Schumaker | a4cdda5 | 2014-05-06 09:12:31 -0400 | [diff] [blame] | 694 | } |
| 695 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 696 | static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror, |
| 697 | unsigned int bsize) |
| 698 | { |
| 699 | INIT_LIST_HEAD(&mirror->pg_list); |
| 700 | mirror->pg_bytes_written = 0; |
| 701 | mirror->pg_count = 0; |
| 702 | mirror->pg_bsize = bsize; |
| 703 | mirror->pg_base = 0; |
| 704 | mirror->pg_recoalesce = 0; |
| 705 | } |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | /** |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 708 | * nfs_pageio_init - initialise a page io descriptor |
| 709 | * @desc: pointer to descriptor |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 710 | * @inode: pointer to inode |
Yijing Wang | dfad700 | 2015-06-18 19:37:13 +0800 | [diff] [blame] | 711 | * @pg_ops: pointer to pageio operations |
| 712 | * @compl_ops: pointer to pageio completion operations |
| 713 | * @rw_ops: pointer to nfs read/write operations |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 714 | * @bsize: io block size |
| 715 | * @io_flags: extra parameters for the io function |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 716 | */ |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 717 | void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
| 718 | struct inode *inode, |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 719 | const struct nfs_pageio_ops *pg_ops, |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 720 | const struct nfs_pgio_completion_ops *compl_ops, |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 721 | const struct nfs_rw_ops *rw_ops, |
Trond Myklebust | 84dde76 | 2007-05-04 14:44:06 -0400 | [diff] [blame] | 722 | size_t bsize, |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 723 | int io_flags) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 724 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 725 | struct nfs_pgio_mirror *new; |
| 726 | int i; |
| 727 | |
Trond Myklebust | b31268a | 2011-03-21 17:02:00 -0400 | [diff] [blame] | 728 | desc->pg_moreio = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 729 | desc->pg_inode = inode; |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 730 | desc->pg_ops = pg_ops; |
Fred Isaman | 061ae2e | 2012-04-20 14:47:48 -0400 | [diff] [blame] | 731 | desc->pg_completion_ops = compl_ops; |
Anna Schumaker | 4a0de55 | 2014-05-06 09:12:30 -0400 | [diff] [blame] | 732 | desc->pg_rw_ops = rw_ops; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 733 | desc->pg_ioflags = io_flags; |
| 734 | desc->pg_error = 0; |
Fred Isaman | 94ad1c8 | 2011-03-01 01:34:14 +0000 | [diff] [blame] | 735 | desc->pg_lseg = NULL; |
Fred Isaman | 584aa81 | 2012-04-20 14:47:51 -0400 | [diff] [blame] | 736 | desc->pg_dreq = NULL; |
Peng Tao | f616638 | 2012-08-02 15:36:09 +0300 | [diff] [blame] | 737 | desc->pg_layout_private = NULL; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 738 | desc->pg_bsize = bsize; |
| 739 | |
| 740 | desc->pg_mirror_count = 1; |
| 741 | desc->pg_mirror_idx = 0; |
| 742 | |
| 743 | if (pg_ops->pg_get_mirror_count) { |
| 744 | /* until we have a request, we don't have an lseg and no |
| 745 | * idea how many mirrors there will be */ |
| 746 | new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX, |
| 747 | sizeof(struct nfs_pgio_mirror), GFP_KERNEL); |
| 748 | desc->pg_mirrors_dynamic = new; |
| 749 | desc->pg_mirrors = new; |
| 750 | |
| 751 | for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++) |
| 752 | nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize); |
| 753 | } else { |
| 754 | desc->pg_mirrors_dynamic = NULL; |
| 755 | desc->pg_mirrors = desc->pg_mirrors_static; |
| 756 | nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize); |
| 757 | } |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 758 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 759 | EXPORT_SYMBOL_GPL(nfs_pageio_init); |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 760 | |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 761 | /** |
| 762 | * nfs_pgio_result - Basic pageio error handling |
| 763 | * @task: The task that ran |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 764 | * @calldata: Pageio header to check |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 765 | */ |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 766 | static void nfs_pgio_result(struct rpc_task *task, void *calldata) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 767 | { |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 768 | struct nfs_pgio_header *hdr = calldata; |
| 769 | struct inode *inode = hdr->inode; |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 770 | |
| 771 | dprintk("NFS: %s: %5u, (status %d)\n", __func__, |
| 772 | task->tk_pid, task->tk_status); |
| 773 | |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 774 | if (hdr->rw_ops->rw_done(task, hdr, inode) != 0) |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 775 | return; |
| 776 | if (task->tk_status < 0) |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 777 | nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset); |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 778 | else |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 779 | hdr->rw_ops->rw_result(task, hdr); |
Anna Schumaker | 0eecb21 | 2014-05-06 09:12:32 -0400 | [diff] [blame] | 780 | } |
| 781 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 782 | /* |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 783 | * Create an RPC task for the given read or write request and kick it. |
| 784 | * The page must have been locked by the caller. |
| 785 | * |
| 786 | * It may happen that the page we're passed is not marked dirty. |
| 787 | * This is the case if nfs_updatepage detects a conflicting request |
| 788 | * that has been written but not committed. |
| 789 | */ |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 790 | int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, |
| 791 | struct nfs_pgio_header *hdr) |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 792 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 793 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 794 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 795 | struct nfs_page *req; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 796 | struct page **pages, |
| 797 | *last_page; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 798 | struct list_head *head = &mirror->pg_list; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 799 | struct nfs_commit_info cinfo; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 800 | unsigned int pagecount, pageused; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 801 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 802 | pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count); |
Weston Andros Adamson | 4714fb5 | 2014-06-09 11:48:37 -0400 | [diff] [blame] | 803 | if (!nfs_pgarray_set(&hdr->page_array, pagecount)) |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 804 | return nfs_pgio_error(desc, hdr); |
| 805 | |
| 806 | nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); |
Weston Andros Adamson | d45f60c | 2014-06-09 11:48:35 -0400 | [diff] [blame] | 807 | pages = hdr->page_array.pagevec; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 808 | last_page = NULL; |
| 809 | pageused = 0; |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 810 | while (!list_empty(head)) { |
| 811 | req = nfs_list_entry(head->next); |
| 812 | nfs_list_remove_request(req); |
| 813 | nfs_list_add_request(req, &hdr->pages); |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 814 | |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 815 | if (!last_page || last_page != req->wb_page) { |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 816 | pageused++; |
Trond Myklebust | b8fb9c30 | 2014-10-13 10:56:12 -0400 | [diff] [blame] | 817 | if (pageused > pagecount) |
| 818 | break; |
| 819 | *pages++ = last_page = req->wb_page; |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 820 | } |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 821 | } |
Weston Andros Adamson | bba5c18 | 2014-08-14 17:39:32 -0400 | [diff] [blame] | 822 | if (WARN_ON_ONCE(pageused != pagecount)) |
| 823 | return nfs_pgio_error(desc, hdr); |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 824 | |
| 825 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && |
| 826 | (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) |
| 827 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; |
| 828 | |
| 829 | /* Set up the argument struct */ |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 830 | nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo); |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 831 | desc->pg_rpc_callops = &nfs_pgio_common_ops; |
| 832 | return 0; |
| 833 | } |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 834 | EXPORT_SYMBOL_GPL(nfs_generic_pgio); |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 835 | |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 836 | static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc) |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 837 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 838 | struct nfs_pgio_mirror *mirror; |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 839 | struct nfs_pgio_header *hdr; |
| 840 | int ret; |
| 841 | |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 842 | mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 843 | |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 844 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
| 845 | if (!hdr) { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 846 | /* TODO: make sure this is right with mirroring - or |
| 847 | * should it back out all mirrors? */ |
| 848 | desc->pg_completion_ops->error_cleanup(&mirror->pg_list); |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 849 | return -ENOMEM; |
| 850 | } |
Weston Andros Adamson | 1e7f3a4 | 2014-06-09 11:48:33 -0400 | [diff] [blame] | 851 | nfs_pgheader_init(desc, hdr, nfs_pgio_header_free); |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 852 | ret = nfs_generic_pgio(desc, hdr); |
| 853 | if (ret == 0) |
Weston Andros Adamson | 7f71472 | 2014-05-15 11:56:53 -0400 | [diff] [blame] | 854 | ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode), |
Peng Tao | 46a5ab4 | 2014-06-13 23:02:25 +0800 | [diff] [blame] | 855 | hdr, |
| 856 | hdr->cred, |
| 857 | NFS_PROTO(hdr->inode), |
Tom Haynes | abde71f | 2014-06-09 13:12:20 -0700 | [diff] [blame] | 858 | desc->pg_rpc_callops, |
Weston Andros Adamson | 7f71472 | 2014-05-15 11:56:53 -0400 | [diff] [blame] | 859 | desc->pg_ioflags, 0); |
Anna Schumaker | cf485fc | 2014-05-06 09:12:39 -0400 | [diff] [blame] | 860 | return ret; |
| 861 | } |
| 862 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 863 | /* |
| 864 | * nfs_pageio_setup_mirroring - determine if mirroring is to be used |
| 865 | * by calling the pg_get_mirror_count op |
| 866 | */ |
| 867 | static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio, |
| 868 | struct nfs_page *req) |
| 869 | { |
| 870 | int mirror_count = 1; |
| 871 | |
| 872 | if (!pgio->pg_ops->pg_get_mirror_count) |
| 873 | return 0; |
| 874 | |
| 875 | mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req); |
| 876 | |
| 877 | if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX) |
| 878 | return -EINVAL; |
| 879 | |
| 880 | if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic)) |
| 881 | return -EINVAL; |
| 882 | |
| 883 | pgio->pg_mirror_count = mirror_count; |
| 884 | |
| 885 | return 0; |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1) |
| 890 | */ |
| 891 | void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio) |
| 892 | { |
| 893 | pgio->pg_mirror_count = 1; |
| 894 | pgio->pg_mirror_idx = 0; |
| 895 | } |
| 896 | |
| 897 | static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio) |
| 898 | { |
| 899 | pgio->pg_mirror_count = 1; |
| 900 | pgio->pg_mirror_idx = 0; |
| 901 | pgio->pg_mirrors = pgio->pg_mirrors_static; |
| 902 | kfree(pgio->pg_mirrors_dynamic); |
| 903 | pgio->pg_mirrors_dynamic = NULL; |
| 904 | } |
| 905 | |
Trond Myklebust | 4109bb7 | 2013-09-06 11:09:38 -0400 | [diff] [blame] | 906 | static bool nfs_match_open_context(const struct nfs_open_context *ctx1, |
| 907 | const struct nfs_open_context *ctx2) |
| 908 | { |
| 909 | return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state; |
| 910 | } |
| 911 | |
| 912 | static bool nfs_match_lock_context(const struct nfs_lock_context *l1, |
| 913 | const struct nfs_lock_context *l2) |
| 914 | { |
| 915 | return l1->lockowner.l_owner == l2->lockowner.l_owner |
| 916 | && l1->lockowner.l_pid == l2->lockowner.l_pid; |
| 917 | } |
| 918 | |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 919 | /** |
| 920 | * nfs_can_coalesce_requests - test two requests for compatibility |
| 921 | * @prev: pointer to nfs_page |
| 922 | * @req: pointer to nfs_page |
| 923 | * |
| 924 | * The nfs_page structures 'prev' and 'req' are compared to ensure that the |
| 925 | * page data area they describe is contiguous, and that their RPC |
| 926 | * credentials, NFSv4 open state, and lockowners are the same. |
| 927 | * |
| 928 | * Return 'true' if this is the case, else return 'false'. |
| 929 | */ |
Benny Halevy | 18ad0a9 | 2011-05-25 21:03:56 +0300 | [diff] [blame] | 930 | static bool nfs_can_coalesce_requests(struct nfs_page *prev, |
| 931 | struct nfs_page *req, |
| 932 | struct nfs_pageio_descriptor *pgio) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 933 | { |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 934 | size_t size; |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 935 | struct file_lock_context *flctx; |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 936 | |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 937 | if (prev) { |
| 938 | if (!nfs_match_open_context(req->wb_context, prev->wb_context)) |
| 939 | return false; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 940 | flctx = d_inode(req->wb_context->dentry)->i_flctx; |
Jeff Layton | bd61e0a | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 941 | if (flctx != NULL && |
| 942 | !(list_empty_careful(&flctx->flc_posix) && |
| 943 | list_empty_careful(&flctx->flc_flock)) && |
Jeff Layton | 5263e31 | 2015-01-16 15:05:55 -0500 | [diff] [blame] | 944 | !nfs_match_lock_context(req->wb_lock_context, |
| 945 | prev->wb_lock_context)) |
| 946 | return false; |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 947 | if (req_offset(req) != req_offset(prev) + prev->wb_bytes) |
| 948 | return false; |
Weston Andros Adamson | 78270e8 | 2014-08-14 17:39:33 -0400 | [diff] [blame] | 949 | if (req->wb_page == prev->wb_page) { |
| 950 | if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes) |
| 951 | return false; |
| 952 | } else { |
| 953 | if (req->wb_pgbase != 0 || |
| 954 | prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE) |
| 955 | return false; |
| 956 | } |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 957 | } |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 958 | size = pgio->pg_ops->pg_test(pgio, prev, req); |
Weston Andros Adamson | f0cb9ab | 2014-05-15 11:56:52 -0400 | [diff] [blame] | 959 | WARN_ON_ONCE(size > req->wb_bytes); |
| 960 | if (size && size < req->wb_bytes) |
| 961 | req->wb_bytes = size; |
Weston Andros Adamson | b4fdac1 | 2014-05-15 11:56:43 -0400 | [diff] [blame] | 962 | return size > 0; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 963 | } |
| 964 | |
| 965 | /** |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 966 | * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list. |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 967 | * @desc: destination io descriptor |
| 968 | * @req: request |
| 969 | * |
| 970 | * Returns true if the request 'req' was successfully coalesced into the |
| 971 | * existing list of pages 'desc'. |
| 972 | */ |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 973 | static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, |
| 974 | struct nfs_page *req) |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 975 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 976 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 977 | |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 978 | struct nfs_page *prev = NULL; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 979 | |
| 980 | if (mirror->pg_count != 0) { |
| 981 | prev = nfs_list_entry(mirror->pg_list.prev); |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 982 | } else { |
Trond Myklebust | d8007d4 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 983 | if (desc->pg_ops->pg_init) |
| 984 | desc->pg_ops->pg_init(desc, req); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 985 | mirror->pg_base = req->wb_pgbase; |
Boaz Harrosh | 5b36c7d | 2011-05-29 11:45:39 +0300 | [diff] [blame] | 986 | } |
Weston Andros Adamson | ab75e41 | 2014-05-15 11:56:44 -0400 | [diff] [blame] | 987 | if (!nfs_can_coalesce_requests(prev, req, desc)) |
| 988 | return 0; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 989 | nfs_list_remove_request(req); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 990 | nfs_list_add_request(req, &mirror->pg_list); |
| 991 | mirror->pg_count += req->wb_bytes; |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 992 | return 1; |
| 993 | } |
| 994 | |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 995 | /* |
| 996 | * Helper for nfs_pageio_add_request and nfs_pageio_complete |
| 997 | */ |
| 998 | static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) |
| 999 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 1000 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1001 | |
| 1002 | |
| 1003 | if (!list_empty(&mirror->pg_list)) { |
Trond Myklebust | 1751c36 | 2011-06-10 13:30:23 -0400 | [diff] [blame] | 1004 | int error = desc->pg_ops->pg_doio(desc); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1005 | if (error < 0) |
| 1006 | desc->pg_error = error; |
| 1007 | else |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1008 | mirror->pg_bytes_written += mirror->pg_count; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1009 | } |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1010 | if (list_empty(&mirror->pg_list)) { |
| 1011 | mirror->pg_count = 0; |
| 1012 | mirror->pg_base = 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1013 | } |
| 1014 | } |
| 1015 | |
| 1016 | /** |
| 1017 | * nfs_pageio_add_request - Attempt to coalesce a request into a page list. |
| 1018 | * @desc: destination io descriptor |
| 1019 | * @req: request |
| 1020 | * |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1021 | * This may split a request into subrequests which are all part of the |
| 1022 | * same page group. |
| 1023 | * |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1024 | * Returns true if the request 'req' was successfully coalesced into the |
| 1025 | * existing list of pages 'desc'. |
| 1026 | */ |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1027 | static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
Trond Myklebust | 8b09bee | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1028 | struct nfs_page *req) |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1029 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 1030 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1031 | |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1032 | struct nfs_page *subreq; |
| 1033 | unsigned int bytes_left = 0; |
| 1034 | unsigned int offset, pgbase; |
| 1035 | |
Weston Andros Adamson | bfd484a | 2014-08-08 11:00:55 -0400 | [diff] [blame] | 1036 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1037 | |
| 1038 | subreq = req; |
| 1039 | bytes_left = subreq->wb_bytes; |
| 1040 | offset = subreq->wb_offset; |
| 1041 | pgbase = subreq->wb_pgbase; |
| 1042 | |
| 1043 | do { |
| 1044 | if (!nfs_pageio_do_add_request(desc, subreq)) { |
| 1045 | /* make sure pg_test call(s) did nothing */ |
| 1046 | WARN_ON_ONCE(subreq->wb_bytes != bytes_left); |
| 1047 | WARN_ON_ONCE(subreq->wb_offset != offset); |
| 1048 | WARN_ON_ONCE(subreq->wb_pgbase != pgbase); |
| 1049 | |
| 1050 | nfs_page_group_unlock(req); |
| 1051 | desc->pg_moreio = 1; |
| 1052 | nfs_pageio_doio(desc); |
| 1053 | if (desc->pg_error < 0) |
| 1054 | return 0; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1055 | if (mirror->pg_recoalesce) |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1056 | return 0; |
| 1057 | /* retry add_request for this subreq */ |
Weston Andros Adamson | bfd484a | 2014-08-08 11:00:55 -0400 | [diff] [blame] | 1058 | nfs_page_group_lock(req, false); |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1059 | continue; |
| 1060 | } |
| 1061 | |
| 1062 | /* check for buggy pg_test call(s) */ |
| 1063 | WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE); |
| 1064 | WARN_ON_ONCE(subreq->wb_bytes > bytes_left); |
| 1065 | WARN_ON_ONCE(subreq->wb_bytes == 0); |
| 1066 | |
| 1067 | bytes_left -= subreq->wb_bytes; |
| 1068 | offset += subreq->wb_bytes; |
| 1069 | pgbase += subreq->wb_bytes; |
| 1070 | |
| 1071 | if (bytes_left) { |
| 1072 | subreq = nfs_create_request(req->wb_context, |
| 1073 | req->wb_page, |
| 1074 | subreq, pgbase, bytes_left); |
Trond Myklebust | c110955 | 2014-05-29 11:38:15 -0400 | [diff] [blame] | 1075 | if (IS_ERR(subreq)) |
| 1076 | goto err_ptr; |
Weston Andros Adamson | 2bfc6e5 | 2014-05-15 11:56:45 -0400 | [diff] [blame] | 1077 | nfs_lock_request(subreq); |
| 1078 | subreq->wb_offset = offset; |
| 1079 | subreq->wb_index = req->wb_index; |
| 1080 | } |
| 1081 | } while (bytes_left > 0); |
| 1082 | |
| 1083 | nfs_page_group_unlock(req); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1084 | return 1; |
Trond Myklebust | c110955 | 2014-05-29 11:38:15 -0400 | [diff] [blame] | 1085 | err_ptr: |
| 1086 | desc->pg_error = PTR_ERR(subreq); |
| 1087 | nfs_page_group_unlock(req); |
| 1088 | return 0; |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1089 | } |
| 1090 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1091 | static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc) |
| 1092 | { |
Peng Tao | 48d635f | 2014-11-10 08:35:35 +0800 | [diff] [blame] | 1093 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1094 | LIST_HEAD(head); |
| 1095 | |
| 1096 | do { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1097 | list_splice_init(&mirror->pg_list, &head); |
| 1098 | mirror->pg_bytes_written -= mirror->pg_count; |
| 1099 | mirror->pg_count = 0; |
| 1100 | mirror->pg_base = 0; |
| 1101 | mirror->pg_recoalesce = 0; |
| 1102 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1103 | while (!list_empty(&head)) { |
| 1104 | struct nfs_page *req; |
| 1105 | |
| 1106 | req = list_first_entry(&head, struct nfs_page, wb_list); |
| 1107 | nfs_list_remove_request(req); |
| 1108 | if (__nfs_pageio_add_request(desc, req)) |
| 1109 | continue; |
Trond Myklebust | 03d5eb6 | 2015-07-27 10:23:19 -0400 | [diff] [blame] | 1110 | if (desc->pg_error < 0) { |
| 1111 | list_splice_tail(&head, &mirror->pg_list); |
| 1112 | mirror->pg_recoalesce = 1; |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1113 | return 0; |
Trond Myklebust | 03d5eb6 | 2015-07-27 10:23:19 -0400 | [diff] [blame] | 1114 | } |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1115 | break; |
| 1116 | } |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1117 | } while (mirror->pg_recoalesce); |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1118 | return 1; |
| 1119 | } |
| 1120 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1121 | static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc, |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1122 | struct nfs_page *req) |
| 1123 | { |
| 1124 | int ret; |
| 1125 | |
| 1126 | do { |
| 1127 | ret = __nfs_pageio_add_request(desc, req); |
| 1128 | if (ret) |
| 1129 | break; |
| 1130 | if (desc->pg_error < 0) |
| 1131 | break; |
| 1132 | ret = nfs_do_recoalesce(desc); |
| 1133 | } while (ret); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1134 | |
Trond Myklebust | d9156f9 | 2011-07-12 13:42:02 -0400 | [diff] [blame] | 1135 | return ret; |
| 1136 | } |
| 1137 | |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1138 | int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
| 1139 | struct nfs_page *req) |
| 1140 | { |
| 1141 | u32 midx; |
| 1142 | unsigned int pgbase, offset, bytes; |
| 1143 | struct nfs_page *dupreq, *lastreq; |
| 1144 | |
| 1145 | pgbase = req->wb_pgbase; |
| 1146 | offset = req->wb_offset; |
| 1147 | bytes = req->wb_bytes; |
| 1148 | |
| 1149 | nfs_pageio_setup_mirroring(desc, req); |
| 1150 | |
| 1151 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 1152 | if (midx) { |
| 1153 | nfs_page_group_lock(req, false); |
| 1154 | |
| 1155 | /* find the last request */ |
| 1156 | for (lastreq = req->wb_head; |
| 1157 | lastreq->wb_this_page != req->wb_head; |
| 1158 | lastreq = lastreq->wb_this_page) |
| 1159 | ; |
| 1160 | |
| 1161 | dupreq = nfs_create_request(req->wb_context, |
| 1162 | req->wb_page, lastreq, pgbase, bytes); |
| 1163 | |
| 1164 | if (IS_ERR(dupreq)) { |
| 1165 | nfs_page_group_unlock(req); |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
| 1169 | nfs_lock_request(dupreq); |
| 1170 | nfs_page_group_unlock(req); |
| 1171 | dupreq->wb_offset = offset; |
| 1172 | dupreq->wb_index = req->wb_index; |
| 1173 | } else |
| 1174 | dupreq = req; |
| 1175 | |
Peng Tao | 47af81f | 2014-11-10 08:35:34 +0800 | [diff] [blame] | 1176 | if (nfs_pgio_has_mirroring(desc)) |
| 1177 | desc->pg_mirror_idx = midx; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1178 | if (!nfs_pageio_add_request_mirror(desc, dupreq)) |
| 1179 | return 0; |
| 1180 | } |
| 1181 | |
| 1182 | return 1; |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an |
| 1187 | * nfs_pageio_descriptor |
| 1188 | * @desc: pointer to io descriptor |
Yijing Wang | dfad700 | 2015-06-18 19:37:13 +0800 | [diff] [blame] | 1189 | * @mirror_idx: pointer to mirror index |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1190 | */ |
| 1191 | static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc, |
| 1192 | u32 mirror_idx) |
| 1193 | { |
| 1194 | struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx]; |
| 1195 | u32 restore_idx = desc->pg_mirror_idx; |
| 1196 | |
Peng Tao | 47af81f | 2014-11-10 08:35:34 +0800 | [diff] [blame] | 1197 | if (nfs_pgio_has_mirroring(desc)) |
| 1198 | desc->pg_mirror_idx = mirror_idx; |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1199 | for (;;) { |
| 1200 | nfs_pageio_doio(desc); |
| 1201 | if (!mirror->pg_recoalesce) |
| 1202 | break; |
| 1203 | if (!nfs_do_recoalesce(desc)) |
| 1204 | break; |
| 1205 | } |
| 1206 | desc->pg_mirror_idx = restore_idx; |
| 1207 | } |
| 1208 | |
Weston Andros Adamson | 53113ad | 2014-06-09 11:48:38 -0400 | [diff] [blame] | 1209 | /* |
| 1210 | * nfs_pageio_resend - Transfer requests to new descriptor and resend |
| 1211 | * @hdr - the pgio header to move request from |
| 1212 | * @desc - the pageio descriptor to add requests to |
| 1213 | * |
| 1214 | * Try to move each request (nfs_page) from @hdr to @desc then attempt |
| 1215 | * to send them. |
| 1216 | * |
| 1217 | * Returns 0 on success and < 0 on error. |
| 1218 | */ |
| 1219 | int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, |
| 1220 | struct nfs_pgio_header *hdr) |
| 1221 | { |
| 1222 | LIST_HEAD(failed); |
| 1223 | |
| 1224 | desc->pg_dreq = hdr->dreq; |
| 1225 | while (!list_empty(&hdr->pages)) { |
| 1226 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); |
| 1227 | |
| 1228 | nfs_list_remove_request(req); |
| 1229 | if (!nfs_pageio_add_request(desc, req)) |
| 1230 | nfs_list_add_request(req, &failed); |
| 1231 | } |
| 1232 | nfs_pageio_complete(desc); |
| 1233 | if (!list_empty(&failed)) { |
| 1234 | list_move(&failed, &hdr->pages); |
| 1235 | return -EIO; |
| 1236 | } |
| 1237 | return 0; |
| 1238 | } |
| 1239 | EXPORT_SYMBOL_GPL(nfs_pageio_resend); |
Trond Myklebust | d8a5ad7 | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1240 | |
| 1241 | /** |
Weston Andros Adamson | 2176bf4 | 2014-09-10 15:44:18 -0400 | [diff] [blame] | 1242 | * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1243 | * @desc: pointer to io descriptor |
| 1244 | */ |
| 1245 | void nfs_pageio_complete(struct nfs_pageio_descriptor *desc) |
| 1246 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1247 | u32 midx; |
| 1248 | |
| 1249 | for (midx = 0; midx < desc->pg_mirror_count; midx++) |
| 1250 | nfs_pageio_complete_mirror(desc, midx); |
Weston Andros Adamson | 2176bf4 | 2014-09-10 15:44:18 -0400 | [diff] [blame] | 1251 | |
| 1252 | if (desc->pg_ops->pg_cleanup) |
| 1253 | desc->pg_ops->pg_cleanup(desc); |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1254 | nfs_pageio_cleanup_mirroring(desc); |
Trond Myklebust | bcb71bb | 2007-04-02 18:48:28 -0400 | [diff] [blame] | 1255 | } |
| 1256 | |
Trond Myklebust | 7fe7f84 | 2007-05-20 10:18:27 -0400 | [diff] [blame] | 1257 | /** |
| 1258 | * nfs_pageio_cond_complete - Conditional I/O completion |
| 1259 | * @desc: pointer to io descriptor |
| 1260 | * @index: page index |
| 1261 | * |
| 1262 | * It is important to ensure that processes don't try to take locks |
| 1263 | * on non-contiguous ranges of pages as that might deadlock. This |
| 1264 | * function should be called before attempting to wait on a locked |
| 1265 | * nfs_page. It will complete the I/O if the page index 'index' |
| 1266 | * is not contiguous with the existing list of pages in 'desc'. |
| 1267 | */ |
| 1268 | void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index) |
| 1269 | { |
Weston Andros Adamson | a7d42dd | 2014-09-19 10:55:07 -0400 | [diff] [blame] | 1270 | struct nfs_pgio_mirror *mirror; |
| 1271 | struct nfs_page *prev; |
| 1272 | u32 midx; |
| 1273 | |
| 1274 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { |
| 1275 | mirror = &desc->pg_mirrors[midx]; |
| 1276 | if (!list_empty(&mirror->pg_list)) { |
| 1277 | prev = nfs_list_entry(mirror->pg_list.prev); |
| 1278 | if (index != prev->wb_index + 1) |
| 1279 | nfs_pageio_complete_mirror(desc, midx); |
| 1280 | } |
Trond Myklebust | 7fe7f84 | 2007-05-20 10:18:27 -0400 | [diff] [blame] | 1281 | } |
| 1282 | } |
| 1283 | |
David Howells | f7b422b | 2006-06-09 09:34:33 -0400 | [diff] [blame] | 1284 | int __init nfs_init_nfspagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | { |
| 1286 | nfs_page_cachep = kmem_cache_create("nfs_page", |
| 1287 | sizeof(struct nfs_page), |
| 1288 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1289 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | if (nfs_page_cachep == NULL) |
| 1291 | return -ENOMEM; |
| 1292 | |
| 1293 | return 0; |
| 1294 | } |
| 1295 | |
David Brownell | 266bee8 | 2006-06-27 12:59:15 -0700 | [diff] [blame] | 1296 | void nfs_destroy_nfspagecache(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1298 | kmem_cache_destroy(nfs_page_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | } |
| 1300 | |
Anna Schumaker | ef2c488 | 2014-05-06 09:12:36 -0400 | [diff] [blame] | 1301 | static const struct rpc_call_ops nfs_pgio_common_ops = { |
Anna Schumaker | 6f92fa4 | 2014-05-06 09:12:33 -0400 | [diff] [blame] | 1302 | .rpc_call_prepare = nfs_pgio_prepare, |
| 1303 | .rpc_call_done = nfs_pgio_result, |
| 1304 | .rpc_release = nfs_pgio_release, |
| 1305 | }; |
Anna Schumaker | 41d8d5b | 2014-05-06 09:12:40 -0400 | [diff] [blame] | 1306 | |
| 1307 | const struct nfs_pageio_ops nfs_pgio_rw_ops = { |
| 1308 | .pg_test = nfs_generic_pg_test, |
| 1309 | .pg_doio = nfs_generic_pg_pgios, |
| 1310 | }; |