Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1 | /* |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 2 | * Compressed RAM block device |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 3 | * |
Nitin Gupta | 1130ebb | 2010-01-28 21:21:35 +0530 | [diff] [blame] | 4 | * Copyright (C) 2008, 2009, 2010 Nitin Gupta |
Minchan Kim | 7bfb3de | 2014-01-30 15:45:55 -0800 | [diff] [blame] | 5 | * 2012, 2013 Minchan Kim |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 6 | * |
| 7 | * This code is released using a dual license strategy: BSD/GPL |
| 8 | * You can choose the licence that better fits your requirements. |
| 9 | * |
| 10 | * Released under the terms of 3-clause BSD License |
| 11 | * Released under the terms of GNU General Public License Version 2.0 |
| 12 | * |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 13 | */ |
| 14 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 15 | #define KMSG_COMPONENT "zram" |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 16 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 17 | |
Robert Jennings | b1f5b81 | 2011-01-28 08:59:26 -0600 | [diff] [blame] | 18 | #ifdef CONFIG_ZRAM_DEBUG |
| 19 | #define DEBUG |
| 20 | #endif |
| 21 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 22 | #include <linux/module.h> |
| 23 | #include <linux/kernel.h> |
Randy Dunlap | 8946a08 | 2010-06-23 20:27:09 -0700 | [diff] [blame] | 24 | #include <linux/bio.h> |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 25 | #include <linux/bitops.h> |
| 26 | #include <linux/blkdev.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/genhd.h> |
| 30 | #include <linux/highmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 32 | #include <linux/string.h> |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 33 | #include <linux/vmalloc.h> |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 34 | |
Nitin Gupta | 16a4bfb | 2010-06-01 13:31:24 +0530 | [diff] [blame] | 35 | #include "zram_drv.h" |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 36 | |
| 37 | /* Globals */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 38 | static int zram_major; |
Jiang Liu | 0f0e3ba | 2013-06-07 00:07:29 +0800 | [diff] [blame] | 39 | static struct zram *zram_devices; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 40 | static const char *default_compressor = "lzo"; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 41 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 42 | /* Module params (documentation at end) */ |
Davidlohr Bueso | ca3d70b | 2013-01-01 21:24:13 -0800 | [diff] [blame] | 43 | static unsigned int num_devices = 1; |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 44 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 45 | #define ZRAM_ATTR_RO(name) \ |
| 46 | static ssize_t zram_attr_##name##_show(struct device *d, \ |
| 47 | struct device_attribute *attr, char *b) \ |
| 48 | { \ |
| 49 | struct zram *zram = dev_to_zram(d); \ |
| 50 | return sprintf(b, "%llu\n", \ |
| 51 | (u64)atomic64_read(&zram->stats.name)); \ |
| 52 | } \ |
| 53 | static struct device_attribute dev_attr_##name = \ |
| 54 | __ATTR(name, S_IRUGO, zram_attr_##name##_show, NULL); |
| 55 | |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 56 | static inline int init_done(struct zram *zram) |
| 57 | { |
| 58 | return zram->meta != NULL; |
| 59 | } |
| 60 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 61 | static inline struct zram *dev_to_zram(struct device *dev) |
| 62 | { |
| 63 | return (struct zram *)dev_to_disk(dev)->private_data; |
| 64 | } |
| 65 | |
| 66 | static ssize_t disksize_show(struct device *dev, |
| 67 | struct device_attribute *attr, char *buf) |
| 68 | { |
| 69 | struct zram *zram = dev_to_zram(dev); |
| 70 | |
| 71 | return sprintf(buf, "%llu\n", zram->disksize); |
| 72 | } |
| 73 | |
| 74 | static ssize_t initstate_show(struct device *dev, |
| 75 | struct device_attribute *attr, char *buf) |
| 76 | { |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 77 | u32 val; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 78 | struct zram *zram = dev_to_zram(dev); |
| 79 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 80 | down_read(&zram->init_lock); |
| 81 | val = init_done(zram); |
| 82 | up_read(&zram->init_lock); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 83 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 84 | return sprintf(buf, "%u\n", val); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static ssize_t orig_data_size_show(struct device *dev, |
| 88 | struct device_attribute *attr, char *buf) |
| 89 | { |
| 90 | struct zram *zram = dev_to_zram(dev); |
| 91 | |
| 92 | return sprintf(buf, "%llu\n", |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 93 | (u64)(atomic64_read(&zram->stats.pages_stored)) << PAGE_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 94 | } |
| 95 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 96 | static ssize_t mem_used_total_show(struct device *dev, |
| 97 | struct device_attribute *attr, char *buf) |
| 98 | { |
| 99 | u64 val = 0; |
| 100 | struct zram *zram = dev_to_zram(dev); |
| 101 | struct zram_meta *meta = zram->meta; |
| 102 | |
| 103 | down_read(&zram->init_lock); |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 104 | if (init_done(zram)) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 105 | val = zs_get_total_size_bytes(meta->mem_pool); |
| 106 | up_read(&zram->init_lock); |
| 107 | |
| 108 | return sprintf(buf, "%llu\n", val); |
| 109 | } |
| 110 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 111 | static ssize_t max_comp_streams_show(struct device *dev, |
| 112 | struct device_attribute *attr, char *buf) |
| 113 | { |
| 114 | int val; |
| 115 | struct zram *zram = dev_to_zram(dev); |
| 116 | |
| 117 | down_read(&zram->init_lock); |
| 118 | val = zram->max_comp_streams; |
| 119 | up_read(&zram->init_lock); |
| 120 | |
| 121 | return sprintf(buf, "%d\n", val); |
| 122 | } |
| 123 | |
| 124 | static ssize_t max_comp_streams_store(struct device *dev, |
| 125 | struct device_attribute *attr, const char *buf, size_t len) |
| 126 | { |
| 127 | int num; |
| 128 | struct zram *zram = dev_to_zram(dev); |
| 129 | |
| 130 | if (kstrtoint(buf, 0, &num)) |
| 131 | return -EINVAL; |
| 132 | if (num < 1) |
| 133 | return -EINVAL; |
| 134 | down_write(&zram->init_lock); |
| 135 | if (init_done(zram)) { |
Sergey Senozhatsky | fe8eb12 | 2014-04-07 15:38:15 -0700 | [diff] [blame^] | 136 | if (zcomp_set_max_streams(zram->comp, num)) |
| 137 | pr_info("Cannot change max compression streams\n"); |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 138 | } |
| 139 | zram->max_comp_streams = num; |
| 140 | up_write(&zram->init_lock); |
| 141 | return len; |
| 142 | } |
| 143 | |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 144 | /* flag operations needs meta->tb_lock */ |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 145 | static int zram_test_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 146 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 147 | { |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 148 | return meta->table[index].flags & BIT(flag); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 149 | } |
| 150 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 151 | static void zram_set_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 152 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 153 | { |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 154 | meta->table[index].flags |= BIT(flag); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 155 | } |
| 156 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 157 | static void zram_clear_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 158 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 159 | { |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 160 | meta->table[index].flags &= ~BIT(flag); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 161 | } |
| 162 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 163 | static inline int is_partial_io(struct bio_vec *bvec) |
| 164 | { |
| 165 | return bvec->bv_len != PAGE_SIZE; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Check if request is within bounds and aligned on zram logical blocks. |
| 170 | */ |
| 171 | static inline int valid_io_request(struct zram *zram, struct bio *bio) |
| 172 | { |
| 173 | u64 start, end, bound; |
Kumar Gaurav | a539c72 | 2013-08-08 23:53:24 +0530 | [diff] [blame] | 174 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 175 | /* unaligned request */ |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 176 | if (unlikely(bio->bi_iter.bi_sector & |
| 177 | (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1))) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 178 | return 0; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 179 | if (unlikely(bio->bi_iter.bi_size & (ZRAM_LOGICAL_BLOCK_SIZE - 1))) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 180 | return 0; |
| 181 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 182 | start = bio->bi_iter.bi_sector; |
| 183 | end = start + (bio->bi_iter.bi_size >> SECTOR_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 184 | bound = zram->disksize >> SECTOR_SHIFT; |
| 185 | /* out of range range */ |
Sergey Senozhatsky | 75c7caf | 2013-06-22 17:21:00 +0300 | [diff] [blame] | 186 | if (unlikely(start >= bound || end > bound || start > end)) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 187 | return 0; |
| 188 | |
| 189 | /* I/O request is valid */ |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | static void zram_meta_free(struct zram_meta *meta) |
| 194 | { |
| 195 | zs_destroy_pool(meta->mem_pool); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 196 | vfree(meta->table); |
| 197 | kfree(meta); |
| 198 | } |
| 199 | |
| 200 | static struct zram_meta *zram_meta_alloc(u64 disksize) |
| 201 | { |
| 202 | size_t num_pages; |
| 203 | struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL); |
| 204 | if (!meta) |
| 205 | goto out; |
| 206 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 207 | num_pages = disksize >> PAGE_SHIFT; |
| 208 | meta->table = vzalloc(num_pages * sizeof(*meta->table)); |
| 209 | if (!meta->table) { |
| 210 | pr_err("Error allocating zram address table\n"); |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 211 | goto free_meta; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | meta->mem_pool = zs_create_pool(GFP_NOIO | __GFP_HIGHMEM); |
| 215 | if (!meta->mem_pool) { |
| 216 | pr_err("Error creating memory pool\n"); |
| 217 | goto free_table; |
| 218 | } |
| 219 | |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 220 | rwlock_init(&meta->tb_lock); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 221 | return meta; |
| 222 | |
| 223 | free_table: |
| 224 | vfree(meta->table); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 225 | free_meta: |
| 226 | kfree(meta); |
| 227 | meta = NULL; |
| 228 | out: |
| 229 | return meta; |
| 230 | } |
| 231 | |
| 232 | static void update_position(u32 *index, int *offset, struct bio_vec *bvec) |
| 233 | { |
| 234 | if (*offset + bvec->bv_len >= PAGE_SIZE) |
| 235 | (*index)++; |
| 236 | *offset = (*offset + bvec->bv_len) % PAGE_SIZE; |
| 237 | } |
| 238 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 239 | static int page_zero_filled(void *ptr) |
| 240 | { |
| 241 | unsigned int pos; |
| 242 | unsigned long *page; |
| 243 | |
| 244 | page = (unsigned long *)ptr; |
| 245 | |
| 246 | for (pos = 0; pos != PAGE_SIZE / sizeof(*page); pos++) { |
| 247 | if (page[pos]) |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | return 1; |
| 252 | } |
| 253 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 254 | static void handle_zero_page(struct bio_vec *bvec) |
| 255 | { |
| 256 | struct page *page = bvec->bv_page; |
| 257 | void *user_mem; |
| 258 | |
| 259 | user_mem = kmap_atomic(page); |
| 260 | if (is_partial_io(bvec)) |
| 261 | memset(user_mem + bvec->bv_offset, 0, bvec->bv_len); |
| 262 | else |
| 263 | clear_page(user_mem); |
| 264 | kunmap_atomic(user_mem); |
| 265 | |
| 266 | flush_dcache_page(page); |
| 267 | } |
| 268 | |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 269 | /* NOTE: caller should hold meta->tb_lock with write-side */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 270 | static void zram_free_page(struct zram *zram, size_t index) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 271 | { |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 272 | struct zram_meta *meta = zram->meta; |
| 273 | unsigned long handle = meta->table[index].handle; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 274 | |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 275 | if (unlikely(!handle)) { |
Nitin Gupta | 2e88228 | 2010-01-28 21:13:41 +0530 | [diff] [blame] | 276 | /* |
| 277 | * No memory is allocated for zero filled pages. |
| 278 | * Simply clear zero page flag. |
| 279 | */ |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 280 | if (zram_test_flag(meta, index, ZRAM_ZERO)) { |
| 281 | zram_clear_flag(meta, index, ZRAM_ZERO); |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 282 | atomic64_dec(&zram->stats.zero_pages); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 283 | } |
| 284 | return; |
| 285 | } |
| 286 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 287 | zs_free(meta->mem_pool, handle); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 288 | |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 289 | atomic64_sub(meta->table[index].size, &zram->stats.compr_data_size); |
| 290 | atomic64_dec(&zram->stats.pages_stored); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 291 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 292 | meta->table[index].handle = 0; |
| 293 | meta->table[index].size = 0; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 294 | } |
| 295 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 296 | static int zram_decompress_page(struct zram *zram, char *mem, u32 index) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 297 | { |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 298 | int ret = 0; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 299 | unsigned char *cmem; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 300 | struct zram_meta *meta = zram->meta; |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 301 | unsigned long handle; |
| 302 | u16 size; |
| 303 | |
| 304 | read_lock(&meta->tb_lock); |
| 305 | handle = meta->table[index].handle; |
| 306 | size = meta->table[index].size; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 307 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 308 | if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) { |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 309 | read_unlock(&meta->tb_lock); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 310 | clear_page(mem); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 311 | return 0; |
| 312 | } |
| 313 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 314 | cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_RO); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 315 | if (size == PAGE_SIZE) |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 316 | copy_page(mem, cmem); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 317 | else |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 318 | ret = zcomp_decompress(zram->comp, cmem, size, mem); |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 319 | zs_unmap_object(meta->mem_pool, handle); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 320 | read_unlock(&meta->tb_lock); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 321 | |
| 322 | /* Should NEVER happen. Return bio error if it does. */ |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 323 | if (unlikely(ret)) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 324 | pr_err("Decompression failed! err=%d, page=%u\n", ret, index); |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 325 | atomic64_inc(&zram->stats.failed_reads); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 332 | static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, |
| 333 | u32 index, int offset, struct bio *bio) |
| 334 | { |
| 335 | int ret; |
| 336 | struct page *page; |
| 337 | unsigned char *user_mem, *uncmem = NULL; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 338 | struct zram_meta *meta = zram->meta; |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 339 | page = bvec->bv_page; |
| 340 | |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 341 | read_lock(&meta->tb_lock); |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 342 | if (unlikely(!meta->table[index].handle) || |
| 343 | zram_test_flag(meta, index, ZRAM_ZERO)) { |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 344 | read_unlock(&meta->tb_lock); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 345 | handle_zero_page(bvec); |
| 346 | return 0; |
| 347 | } |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 348 | read_unlock(&meta->tb_lock); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 349 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 350 | if (is_partial_io(bvec)) |
| 351 | /* Use a temporary buffer to decompress the page */ |
Minchan Kim | 7e5a510 | 2013-01-30 11:41:39 +0900 | [diff] [blame] | 352 | uncmem = kmalloc(PAGE_SIZE, GFP_NOIO); |
| 353 | |
| 354 | user_mem = kmap_atomic(page); |
| 355 | if (!is_partial_io(bvec)) |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 356 | uncmem = user_mem; |
| 357 | |
| 358 | if (!uncmem) { |
| 359 | pr_info("Unable to allocate temp memory\n"); |
| 360 | ret = -ENOMEM; |
| 361 | goto out_cleanup; |
| 362 | } |
| 363 | |
| 364 | ret = zram_decompress_page(zram, uncmem, index); |
| 365 | /* Should NEVER happen. Return bio error if it does. */ |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 366 | if (unlikely(ret)) |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 367 | goto out_cleanup; |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 368 | |
| 369 | if (is_partial_io(bvec)) |
| 370 | memcpy(user_mem + bvec->bv_offset, uncmem + offset, |
| 371 | bvec->bv_len); |
| 372 | |
| 373 | flush_dcache_page(page); |
| 374 | ret = 0; |
| 375 | out_cleanup: |
| 376 | kunmap_atomic(user_mem); |
| 377 | if (is_partial_io(bvec)) |
| 378 | kfree(uncmem); |
| 379 | return ret; |
| 380 | } |
| 381 | |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 382 | static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, |
| 383 | int offset) |
| 384 | { |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 385 | int ret = 0; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 386 | size_t clen; |
Minchan Kim | c234434 | 2012-06-08 15:39:25 +0900 | [diff] [blame] | 387 | unsigned long handle; |
Minchan Kim | 130f315 | 2012-06-08 15:39:27 +0900 | [diff] [blame] | 388 | struct page *page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 389 | unsigned char *user_mem, *cmem, *src, *uncmem = NULL; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 390 | struct zram_meta *meta = zram->meta; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 391 | struct zcomp_strm *zstrm; |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 392 | bool locked = false; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 393 | |
| 394 | page = bvec->bv_page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 395 | if (is_partial_io(bvec)) { |
| 396 | /* |
| 397 | * This is a partial IO. We need to read the full page |
| 398 | * before to write the changes. |
| 399 | */ |
Minchan Kim | 7e5a510 | 2013-01-30 11:41:39 +0900 | [diff] [blame] | 400 | uncmem = kmalloc(PAGE_SIZE, GFP_NOIO); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 401 | if (!uncmem) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 402 | ret = -ENOMEM; |
| 403 | goto out; |
| 404 | } |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 405 | ret = zram_decompress_page(zram, uncmem, index); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 406 | if (ret) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 407 | goto out; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 408 | } |
| 409 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 410 | zstrm = zcomp_strm_find(zram->comp); |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 411 | locked = true; |
Cong Wang | ba82fe2 | 2011-11-25 23:14:25 +0800 | [diff] [blame] | 412 | user_mem = kmap_atomic(page); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 413 | |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 414 | if (is_partial_io(bvec)) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 415 | memcpy(uncmem + offset, user_mem + bvec->bv_offset, |
| 416 | bvec->bv_len); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 417 | kunmap_atomic(user_mem); |
| 418 | user_mem = NULL; |
| 419 | } else { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 420 | uncmem = user_mem; |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 421 | } |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 422 | |
| 423 | if (page_zero_filled(uncmem)) { |
Cong Wang | ba82fe2 | 2011-11-25 23:14:25 +0800 | [diff] [blame] | 424 | kunmap_atomic(user_mem); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 425 | /* Free memory associated with this sector now. */ |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 426 | write_lock(&zram->meta->tb_lock); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 427 | zram_free_page(zram, index); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 428 | zram_set_flag(meta, index, ZRAM_ZERO); |
| 429 | write_unlock(&zram->meta->tb_lock); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 430 | |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 431 | atomic64_inc(&zram->stats.zero_pages); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 432 | ret = 0; |
| 433 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 434 | } |
| 435 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 436 | ret = zcomp_compress(zram->comp, zstrm, uncmem, &clen); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 437 | if (!is_partial_io(bvec)) { |
| 438 | kunmap_atomic(user_mem); |
| 439 | user_mem = NULL; |
| 440 | uncmem = NULL; |
| 441 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 442 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 443 | if (unlikely(ret)) { |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 444 | pr_err("Compression failed! err=%d\n", ret); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 445 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 446 | } |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 447 | src = zstrm->buffer; |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 448 | if (unlikely(clen > max_zpage_size)) { |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 449 | clen = PAGE_SIZE; |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 450 | if (is_partial_io(bvec)) |
| 451 | src = uncmem; |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 452 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 453 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 454 | handle = zs_malloc(meta->mem_pool, clen); |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 455 | if (!handle) { |
Marlies Ruck | 596b3dd | 2013-05-16 14:30:39 -0400 | [diff] [blame] | 456 | pr_info("Error allocating memory for compressed page: %u, size=%zu\n", |
| 457 | index, clen); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 458 | ret = -ENOMEM; |
| 459 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 460 | } |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 461 | cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_WO); |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 462 | |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 463 | if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) { |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 464 | src = kmap_atomic(page); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 465 | copy_page(cmem, src); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 466 | kunmap_atomic(src); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 467 | } else { |
| 468 | memcpy(cmem, src, clen); |
| 469 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 470 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 471 | zcomp_strm_release(zram->comp, zstrm); |
| 472 | locked = false; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 473 | zs_unmap_object(meta->mem_pool, handle); |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 474 | |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 475 | /* |
| 476 | * Free memory associated with this sector |
| 477 | * before overwriting unused sectors. |
| 478 | */ |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 479 | write_lock(&zram->meta->tb_lock); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 480 | zram_free_page(zram, index); |
| 481 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 482 | meta->table[index].handle = handle; |
| 483 | meta->table[index].size = clen; |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 484 | write_unlock(&zram->meta->tb_lock); |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 485 | |
| 486 | /* Update stats */ |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 487 | atomic64_add(clen, &zram->stats.compr_data_size); |
| 488 | atomic64_inc(&zram->stats.pages_stored); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 489 | out: |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 490 | if (locked) |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 491 | zcomp_strm_release(zram->comp, zstrm); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 492 | if (is_partial_io(bvec)) |
| 493 | kfree(uncmem); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 494 | if (ret) |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 495 | atomic64_inc(&zram->stats.failed_writes); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 496 | return ret; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index, |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 500 | int offset, struct bio *bio) |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 501 | { |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 502 | int ret; |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 503 | int rw = bio_data_dir(bio); |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 504 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 505 | if (rw == READ) { |
| 506 | atomic64_inc(&zram->stats.num_reads); |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 507 | ret = zram_bvec_read(zram, bvec, index, offset, bio); |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 508 | } else { |
| 509 | atomic64_inc(&zram->stats.num_writes); |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 510 | ret = zram_bvec_write(zram, bvec, index, offset); |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 511 | } |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 512 | |
| 513 | return ret; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 514 | } |
| 515 | |
Minchan Kim | 2b86ab9 | 2013-08-12 15:13:55 +0900 | [diff] [blame] | 516 | static void zram_reset_device(struct zram *zram, bool reset_capacity) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 517 | { |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 518 | size_t index; |
| 519 | struct zram_meta *meta; |
| 520 | |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 521 | down_write(&zram->init_lock); |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 522 | if (!init_done(zram)) { |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 523 | up_write(&zram->init_lock); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 524 | return; |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 525 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 526 | |
| 527 | meta = zram->meta; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 528 | /* Free all pages that are still in this zram device */ |
| 529 | for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) { |
| 530 | unsigned long handle = meta->table[index].handle; |
| 531 | if (!handle) |
| 532 | continue; |
| 533 | |
| 534 | zs_free(meta->mem_pool, handle); |
| 535 | } |
| 536 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 537 | zcomp_destroy(zram->comp); |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 538 | zram->max_comp_streams = 1; |
| 539 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 540 | zram_meta_free(zram->meta); |
| 541 | zram->meta = NULL; |
| 542 | /* Reset stats */ |
| 543 | memset(&zram->stats, 0, sizeof(zram->stats)); |
| 544 | |
| 545 | zram->disksize = 0; |
Minchan Kim | 2b86ab9 | 2013-08-12 15:13:55 +0900 | [diff] [blame] | 546 | if (reset_capacity) |
| 547 | set_capacity(zram->disk, 0); |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 548 | up_write(&zram->init_lock); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 549 | } |
| 550 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 551 | static ssize_t disksize_store(struct device *dev, |
| 552 | struct device_attribute *attr, const char *buf, size_t len) |
| 553 | { |
| 554 | u64 disksize; |
| 555 | struct zram_meta *meta; |
| 556 | struct zram *zram = dev_to_zram(dev); |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 557 | int err; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 558 | |
| 559 | disksize = memparse(buf, NULL); |
| 560 | if (!disksize) |
| 561 | return -EINVAL; |
| 562 | |
| 563 | disksize = PAGE_ALIGN(disksize); |
| 564 | meta = zram_meta_alloc(disksize); |
Minchan Kim | db5d711 | 2014-03-03 15:38:34 -0800 | [diff] [blame] | 565 | if (!meta) |
| 566 | return -ENOMEM; |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 567 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 568 | down_write(&zram->init_lock); |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 569 | if (init_done(zram)) { |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 570 | pr_info("Cannot change disksize for initialized device\n"); |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 571 | err = -EBUSY; |
| 572 | goto out_free_meta; |
| 573 | } |
| 574 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 575 | zram->comp = zcomp_create(default_compressor, zram->max_comp_streams); |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 576 | if (!zram->comp) { |
| 577 | pr_info("Cannot initialise %s compressing backend\n", |
| 578 | default_compressor); |
| 579 | err = -EINVAL; |
| 580 | goto out_free_meta; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 581 | } |
| 582 | |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 583 | zram->meta = meta; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 584 | zram->disksize = disksize; |
| 585 | set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 586 | up_write(&zram->init_lock); |
| 587 | |
| 588 | return len; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 589 | |
| 590 | out_free_meta: |
| 591 | up_write(&zram->init_lock); |
| 592 | zram_meta_free(meta); |
| 593 | return err; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | static ssize_t reset_store(struct device *dev, |
| 597 | struct device_attribute *attr, const char *buf, size_t len) |
| 598 | { |
| 599 | int ret; |
| 600 | unsigned short do_reset; |
| 601 | struct zram *zram; |
| 602 | struct block_device *bdev; |
| 603 | |
| 604 | zram = dev_to_zram(dev); |
| 605 | bdev = bdget_disk(zram->disk, 0); |
| 606 | |
Rashika Kheria | 46a51c8 | 2013-10-30 18:36:32 +0530 | [diff] [blame] | 607 | if (!bdev) |
| 608 | return -ENOMEM; |
| 609 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 610 | /* Do not reset an active device! */ |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 611 | if (bdev->bd_holders) { |
| 612 | ret = -EBUSY; |
| 613 | goto out; |
| 614 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 615 | |
| 616 | ret = kstrtou16(buf, 10, &do_reset); |
| 617 | if (ret) |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 618 | goto out; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 619 | |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 620 | if (!do_reset) { |
| 621 | ret = -EINVAL; |
| 622 | goto out; |
| 623 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 624 | |
| 625 | /* Make sure all pending I/O is finished */ |
Rashika Kheria | 46a51c8 | 2013-10-30 18:36:32 +0530 | [diff] [blame] | 626 | fsync_bdev(bdev); |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 627 | bdput(bdev); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 628 | |
Minchan Kim | 2b86ab9 | 2013-08-12 15:13:55 +0900 | [diff] [blame] | 629 | zram_reset_device(zram, true); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 630 | return len; |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 631 | |
| 632 | out: |
| 633 | bdput(bdev); |
| 634 | return ret; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 635 | } |
| 636 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 637 | static void __zram_make_request(struct zram *zram, struct bio *bio) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 638 | { |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 639 | int offset; |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 640 | u32 index; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 641 | struct bio_vec bvec; |
| 642 | struct bvec_iter iter; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 643 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 644 | index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; |
| 645 | offset = (bio->bi_iter.bi_sector & |
| 646 | (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 647 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 648 | bio_for_each_segment(bvec, bio, iter) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 649 | int max_transfer_size = PAGE_SIZE - offset; |
| 650 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 651 | if (bvec.bv_len > max_transfer_size) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 652 | /* |
| 653 | * zram_bvec_rw() can only make operation on a single |
| 654 | * zram page. Split the bio vector. |
| 655 | */ |
| 656 | struct bio_vec bv; |
| 657 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 658 | bv.bv_page = bvec.bv_page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 659 | bv.bv_len = max_transfer_size; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 660 | bv.bv_offset = bvec.bv_offset; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 661 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 662 | if (zram_bvec_rw(zram, &bv, index, offset, bio) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 663 | goto out; |
| 664 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 665 | bv.bv_len = bvec.bv_len - max_transfer_size; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 666 | bv.bv_offset += max_transfer_size; |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 667 | if (zram_bvec_rw(zram, &bv, index + 1, 0, bio) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 668 | goto out; |
| 669 | } else |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 670 | if (zram_bvec_rw(zram, &bvec, index, offset, bio) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 671 | goto out; |
| 672 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 673 | update_position(&index, &offset, &bvec); |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 674 | } |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 675 | |
| 676 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
| 677 | bio_endio(bio, 0); |
Nitin Gupta | 7d7854b | 2011-01-22 07:36:15 -0500 | [diff] [blame] | 678 | return; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 679 | |
| 680 | out: |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 681 | bio_io_error(bio); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 682 | } |
| 683 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 684 | /* |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 685 | * Handler function for all zram I/O requests. |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 686 | */ |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 687 | static void zram_make_request(struct request_queue *queue, struct bio *bio) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 688 | { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 689 | struct zram *zram = queue->queuedata; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 690 | |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 691 | down_read(&zram->init_lock); |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 692 | if (unlikely(!init_done(zram))) |
Minchan Kim | 3de738c | 2013-01-30 11:41:41 +0900 | [diff] [blame] | 693 | goto error; |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 694 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 695 | if (!valid_io_request(zram, bio)) { |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 696 | atomic64_inc(&zram->stats.invalid_io); |
Minchan Kim | 3de738c | 2013-01-30 11:41:41 +0900 | [diff] [blame] | 697 | goto error; |
Jerome Marchand | 6642a67 | 2011-02-17 17:11:49 +0100 | [diff] [blame] | 698 | } |
| 699 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 700 | __zram_make_request(zram, bio); |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 701 | up_read(&zram->init_lock); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 702 | |
Linus Torvalds | b4fdcb0 | 2011-11-04 17:06:58 -0700 | [diff] [blame] | 703 | return; |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 704 | |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 705 | error: |
Minchan Kim | 3de738c | 2013-01-30 11:41:41 +0900 | [diff] [blame] | 706 | up_read(&zram->init_lock); |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 707 | bio_io_error(bio); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 708 | } |
| 709 | |
Nitin Gupta | 2ccbec0 | 2011-09-09 19:01:00 -0400 | [diff] [blame] | 710 | static void zram_slot_free_notify(struct block_device *bdev, |
| 711 | unsigned long index) |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 712 | { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 713 | struct zram *zram; |
Minchan Kim | f614a9f | 2014-01-30 15:46:04 -0800 | [diff] [blame] | 714 | struct zram_meta *meta; |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 715 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 716 | zram = bdev->bd_disk->private_data; |
Minchan Kim | f614a9f | 2014-01-30 15:46:04 -0800 | [diff] [blame] | 717 | meta = zram->meta; |
| 718 | |
| 719 | write_lock(&meta->tb_lock); |
| 720 | zram_free_page(zram, index); |
| 721 | write_unlock(&meta->tb_lock); |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 722 | atomic64_inc(&zram->stats.notify_free); |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 723 | } |
| 724 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 725 | static const struct block_device_operations zram_devops = { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 726 | .swap_slot_free_notify = zram_slot_free_notify, |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 727 | .owner = THIS_MODULE |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 728 | }; |
| 729 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 730 | static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR, |
| 731 | disksize_show, disksize_store); |
| 732 | static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL); |
| 733 | static DEVICE_ATTR(reset, S_IWUSR, NULL, reset_store); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 734 | static DEVICE_ATTR(orig_data_size, S_IRUGO, orig_data_size_show, NULL); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 735 | static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL); |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 736 | static DEVICE_ATTR(max_comp_streams, S_IRUGO | S_IWUSR, |
| 737 | max_comp_streams_show, max_comp_streams_store); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 738 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 739 | ZRAM_ATTR_RO(num_reads); |
| 740 | ZRAM_ATTR_RO(num_writes); |
Sergey Senozhatsky | 6444724 | 2014-04-07 15:38:05 -0700 | [diff] [blame] | 741 | ZRAM_ATTR_RO(failed_reads); |
| 742 | ZRAM_ATTR_RO(failed_writes); |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 743 | ZRAM_ATTR_RO(invalid_io); |
| 744 | ZRAM_ATTR_RO(notify_free); |
| 745 | ZRAM_ATTR_RO(zero_pages); |
| 746 | ZRAM_ATTR_RO(compr_data_size); |
| 747 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 748 | static struct attribute *zram_disk_attrs[] = { |
| 749 | &dev_attr_disksize.attr, |
| 750 | &dev_attr_initstate.attr, |
| 751 | &dev_attr_reset.attr, |
| 752 | &dev_attr_num_reads.attr, |
| 753 | &dev_attr_num_writes.attr, |
Sergey Senozhatsky | 6444724 | 2014-04-07 15:38:05 -0700 | [diff] [blame] | 754 | &dev_attr_failed_reads.attr, |
| 755 | &dev_attr_failed_writes.attr, |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 756 | &dev_attr_invalid_io.attr, |
| 757 | &dev_attr_notify_free.attr, |
| 758 | &dev_attr_zero_pages.attr, |
| 759 | &dev_attr_orig_data_size.attr, |
| 760 | &dev_attr_compr_data_size.attr, |
| 761 | &dev_attr_mem_used_total.attr, |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 762 | &dev_attr_max_comp_streams.attr, |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 763 | NULL, |
| 764 | }; |
| 765 | |
| 766 | static struct attribute_group zram_disk_attr_group = { |
| 767 | .attrs = zram_disk_attrs, |
| 768 | }; |
| 769 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 770 | static int create_device(struct zram *zram, int device_id) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 771 | { |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 772 | int ret = -ENOMEM; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 773 | |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 774 | init_rwsem(&zram->init_lock); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 775 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 776 | zram->queue = blk_alloc_queue(GFP_KERNEL); |
| 777 | if (!zram->queue) { |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 778 | pr_err("Error allocating disk queue for device %d\n", |
| 779 | device_id); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 780 | goto out; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 781 | } |
| 782 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 783 | blk_queue_make_request(zram->queue, zram_make_request); |
| 784 | zram->queue->queuedata = zram; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 785 | |
| 786 | /* gendisk structure */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 787 | zram->disk = alloc_disk(1); |
| 788 | if (!zram->disk) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 789 | pr_warn("Error allocating disk structure for device %d\n", |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 790 | device_id); |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 791 | goto out_free_queue; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 792 | } |
| 793 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 794 | zram->disk->major = zram_major; |
| 795 | zram->disk->first_minor = device_id; |
| 796 | zram->disk->fops = &zram_devops; |
| 797 | zram->disk->queue = zram->queue; |
| 798 | zram->disk->private_data = zram; |
| 799 | snprintf(zram->disk->disk_name, 16, "zram%d", device_id); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 800 | |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 801 | /* Actual capacity set using syfs (/sys/block/zram<id>/disksize */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 802 | set_capacity(zram->disk, 0); |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 803 | /* zram devices sort of resembles non-rotational disks */ |
| 804 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue); |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 805 | /* |
| 806 | * To ensure that we always get PAGE_SIZE aligned |
| 807 | * and n*PAGE_SIZED sized I/O requests. |
| 808 | */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 809 | blk_queue_physical_block_size(zram->disk->queue, PAGE_SIZE); |
Robert Jennings | 7b19b8d | 2011-01-28 08:58:17 -0600 | [diff] [blame] | 810 | blk_queue_logical_block_size(zram->disk->queue, |
| 811 | ZRAM_LOGICAL_BLOCK_SIZE); |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 812 | blk_queue_io_min(zram->disk->queue, PAGE_SIZE); |
| 813 | blk_queue_io_opt(zram->disk->queue, PAGE_SIZE); |
Nitin Gupta | 5d83d5a | 2010-01-28 21:13:39 +0530 | [diff] [blame] | 814 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 815 | add_disk(zram->disk); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 816 | |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 817 | ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, |
| 818 | &zram_disk_attr_group); |
| 819 | if (ret < 0) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 820 | pr_warn("Error creating sysfs group"); |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 821 | goto out_free_disk; |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 822 | } |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 823 | |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 824 | zram->meta = NULL; |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 825 | zram->max_comp_streams = 1; |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 826 | return 0; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 827 | |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 828 | out_free_disk: |
| 829 | del_gendisk(zram->disk); |
| 830 | put_disk(zram->disk); |
| 831 | out_free_queue: |
| 832 | blk_cleanup_queue(zram->queue); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 833 | out: |
| 834 | return ret; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 835 | } |
| 836 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 837 | static void destroy_device(struct zram *zram) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 838 | { |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 839 | sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, |
| 840 | &zram_disk_attr_group); |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 841 | |
Rashika Kheria | 59d3fe5 | 2013-10-30 18:43:32 +0530 | [diff] [blame] | 842 | del_gendisk(zram->disk); |
| 843 | put_disk(zram->disk); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 844 | |
Rashika Kheria | 59d3fe5 | 2013-10-30 18:43:32 +0530 | [diff] [blame] | 845 | blk_cleanup_queue(zram->queue); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 846 | } |
| 847 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 848 | static int __init zram_init(void) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 849 | { |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 850 | int ret, dev_id; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 851 | |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 852 | if (num_devices > max_num_devices) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 853 | pr_warn("Invalid value for num_devices: %u\n", |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 854 | num_devices); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 855 | ret = -EINVAL; |
| 856 | goto out; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 857 | } |
| 858 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 859 | zram_major = register_blkdev(0, "zram"); |
| 860 | if (zram_major <= 0) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 861 | pr_warn("Unable to get major number\n"); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 862 | ret = -EBUSY; |
| 863 | goto out; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 864 | } |
| 865 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 866 | /* Allocate the device array and initialize each one */ |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 867 | zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL); |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 868 | if (!zram_devices) { |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 869 | ret = -ENOMEM; |
| 870 | goto unregister; |
| 871 | } |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 872 | |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 873 | for (dev_id = 0; dev_id < num_devices; dev_id++) { |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 874 | ret = create_device(&zram_devices[dev_id], dev_id); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 875 | if (ret) |
Minchan Kim | 3bf040c | 2010-01-11 16:15:53 +0900 | [diff] [blame] | 876 | goto free_devices; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 877 | } |
| 878 | |
Davidlohr Bueso | ca3d70b | 2013-01-01 21:24:13 -0800 | [diff] [blame] | 879 | pr_info("Created %u device(s) ...\n", num_devices); |
| 880 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 881 | return 0; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 882 | |
Minchan Kim | 3bf040c | 2010-01-11 16:15:53 +0900 | [diff] [blame] | 883 | free_devices: |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 884 | while (dev_id) |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 885 | destroy_device(&zram_devices[--dev_id]); |
| 886 | kfree(zram_devices); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 887 | unregister: |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 888 | unregister_blkdev(zram_major, "zram"); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 889 | out: |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 890 | return ret; |
| 891 | } |
| 892 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 893 | static void __exit zram_exit(void) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 894 | { |
| 895 | int i; |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 896 | struct zram *zram; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 897 | |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 898 | for (i = 0; i < num_devices; i++) { |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 899 | zram = &zram_devices[i]; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 900 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 901 | destroy_device(zram); |
Minchan Kim | 2b86ab9 | 2013-08-12 15:13:55 +0900 | [diff] [blame] | 902 | /* |
| 903 | * Shouldn't access zram->disk after destroy_device |
| 904 | * because destroy_device already released zram->disk. |
| 905 | */ |
| 906 | zram_reset_device(zram, false); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 907 | } |
| 908 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 909 | unregister_blkdev(zram_major, "zram"); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 910 | |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 911 | kfree(zram_devices); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 912 | pr_debug("Cleanup done!\n"); |
| 913 | } |
| 914 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 915 | module_init(zram_init); |
| 916 | module_exit(zram_exit); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 917 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 918 | module_param(num_devices, uint, 0); |
| 919 | MODULE_PARM_DESC(num_devices, "Number of zram devices"); |
| 920 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 921 | MODULE_LICENSE("Dual BSD/GPL"); |
| 922 | MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>"); |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 923 | MODULE_DESCRIPTION("Compressed RAM Block Device"); |