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> |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 34 | #include <linux/err.h> |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 35 | |
Nitin Gupta | 16a4bfb | 2010-06-01 13:31:24 +0530 | [diff] [blame] | 36 | #include "zram_drv.h" |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 37 | |
| 38 | /* Globals */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 39 | static int zram_major; |
Jiang Liu | 0f0e3ba | 2013-06-07 00:07:29 +0800 | [diff] [blame] | 40 | static struct zram *zram_devices; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 41 | static const char *default_compressor = "lzo"; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 42 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 43 | /* Module params (documentation at end) */ |
Davidlohr Bueso | ca3d70b | 2013-01-01 21:24:13 -0800 | [diff] [blame] | 44 | static unsigned int num_devices = 1; |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 45 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 46 | #define ZRAM_ATTR_RO(name) \ |
Ganesh Mahendran | 083914e | 2014-12-12 16:57:13 -0800 | [diff] [blame] | 47 | static ssize_t name##_show(struct device *d, \ |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 48 | struct device_attribute *attr, char *b) \ |
| 49 | { \ |
| 50 | struct zram *zram = dev_to_zram(d); \ |
Sergey Senozhatsky | 56b4e8c | 2014-04-07 15:38:22 -0700 | [diff] [blame] | 51 | return scnprintf(b, PAGE_SIZE, "%llu\n", \ |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 52 | (u64)atomic64_read(&zram->stats.name)); \ |
| 53 | } \ |
Ganesh Mahendran | 083914e | 2014-12-12 16:57:13 -0800 | [diff] [blame] | 54 | static DEVICE_ATTR_RO(name); |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 55 | |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 56 | static inline bool init_done(struct zram *zram) |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 57 | { |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 58 | return zram->disksize; |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 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 | |
Sergey Senozhatsky | 56b4e8c | 2014-04-07 15:38:22 -0700 | [diff] [blame] | 71 | return scnprintf(buf, PAGE_SIZE, "%llu\n", zram->disksize); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 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 | 56b4e8c | 2014-04-07 15:38:22 -0700 | [diff] [blame] | 84 | return scnprintf(buf, PAGE_SIZE, "%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 | |
Sergey Senozhatsky | 56b4e8c | 2014-04-07 15:38:22 -0700 | [diff] [blame] | 92 | return scnprintf(buf, PAGE_SIZE, "%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); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 101 | |
| 102 | down_read(&zram->init_lock); |
Weijie Yang | 5a99e95 | 2014-10-29 14:50:57 -0700 | [diff] [blame] | 103 | if (init_done(zram)) { |
| 104 | struct zram_meta *meta = zram->meta; |
Minchan Kim | 722cdc1 | 2014-10-09 15:29:50 -0700 | [diff] [blame] | 105 | val = zs_get_total_pages(meta->mem_pool); |
Weijie Yang | 5a99e95 | 2014-10-29 14:50:57 -0700 | [diff] [blame] | 106 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 107 | up_read(&zram->init_lock); |
| 108 | |
Minchan Kim | 722cdc1 | 2014-10-09 15:29:50 -0700 | [diff] [blame] | 109 | return scnprintf(buf, PAGE_SIZE, "%llu\n", val << PAGE_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 110 | } |
| 111 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 112 | static ssize_t max_comp_streams_show(struct device *dev, |
| 113 | struct device_attribute *attr, char *buf) |
| 114 | { |
| 115 | int val; |
| 116 | struct zram *zram = dev_to_zram(dev); |
| 117 | |
| 118 | down_read(&zram->init_lock); |
| 119 | val = zram->max_comp_streams; |
| 120 | up_read(&zram->init_lock); |
| 121 | |
Sergey Senozhatsky | 56b4e8c | 2014-04-07 15:38:22 -0700 | [diff] [blame] | 122 | return scnprintf(buf, PAGE_SIZE, "%d\n", val); |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Minchan Kim | 9ada9da | 2014-10-09 15:29:53 -0700 | [diff] [blame] | 125 | static ssize_t mem_limit_show(struct device *dev, |
| 126 | struct device_attribute *attr, char *buf) |
| 127 | { |
| 128 | u64 val; |
| 129 | struct zram *zram = dev_to_zram(dev); |
| 130 | |
| 131 | down_read(&zram->init_lock); |
| 132 | val = zram->limit_pages; |
| 133 | up_read(&zram->init_lock); |
| 134 | |
| 135 | return scnprintf(buf, PAGE_SIZE, "%llu\n", val << PAGE_SHIFT); |
| 136 | } |
| 137 | |
| 138 | static ssize_t mem_limit_store(struct device *dev, |
| 139 | struct device_attribute *attr, const char *buf, size_t len) |
| 140 | { |
| 141 | u64 limit; |
| 142 | char *tmp; |
| 143 | struct zram *zram = dev_to_zram(dev); |
| 144 | |
| 145 | limit = memparse(buf, &tmp); |
| 146 | if (buf == tmp) /* no chars parsed, invalid input */ |
| 147 | return -EINVAL; |
| 148 | |
| 149 | down_write(&zram->init_lock); |
| 150 | zram->limit_pages = PAGE_ALIGN(limit) >> PAGE_SHIFT; |
| 151 | up_write(&zram->init_lock); |
| 152 | |
| 153 | return len; |
| 154 | } |
| 155 | |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 156 | static ssize_t mem_used_max_show(struct device *dev, |
| 157 | struct device_attribute *attr, char *buf) |
| 158 | { |
| 159 | u64 val = 0; |
| 160 | struct zram *zram = dev_to_zram(dev); |
| 161 | |
| 162 | down_read(&zram->init_lock); |
| 163 | if (init_done(zram)) |
| 164 | val = atomic_long_read(&zram->stats.max_used_pages); |
| 165 | up_read(&zram->init_lock); |
| 166 | |
| 167 | return scnprintf(buf, PAGE_SIZE, "%llu\n", val << PAGE_SHIFT); |
| 168 | } |
| 169 | |
| 170 | static ssize_t mem_used_max_store(struct device *dev, |
| 171 | struct device_attribute *attr, const char *buf, size_t len) |
| 172 | { |
| 173 | int err; |
| 174 | unsigned long val; |
| 175 | struct zram *zram = dev_to_zram(dev); |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 176 | |
| 177 | err = kstrtoul(buf, 10, &val); |
| 178 | if (err || val != 0) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | down_read(&zram->init_lock); |
Weijie Yang | 5a99e95 | 2014-10-29 14:50:57 -0700 | [diff] [blame] | 182 | if (init_done(zram)) { |
| 183 | struct zram_meta *meta = zram->meta; |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 184 | atomic_long_set(&zram->stats.max_used_pages, |
| 185 | zs_get_total_pages(meta->mem_pool)); |
Weijie Yang | 5a99e95 | 2014-10-29 14:50:57 -0700 | [diff] [blame] | 186 | } |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 187 | up_read(&zram->init_lock); |
| 188 | |
| 189 | return len; |
| 190 | } |
| 191 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 192 | static ssize_t max_comp_streams_store(struct device *dev, |
| 193 | struct device_attribute *attr, const char *buf, size_t len) |
| 194 | { |
| 195 | int num; |
| 196 | struct zram *zram = dev_to_zram(dev); |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 197 | int ret; |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 198 | |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 199 | ret = kstrtoint(buf, 0, &num); |
| 200 | if (ret < 0) |
| 201 | return ret; |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 202 | if (num < 1) |
| 203 | return -EINVAL; |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 204 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 205 | down_write(&zram->init_lock); |
| 206 | if (init_done(zram)) { |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 207 | if (!zcomp_set_max_streams(zram->comp, num)) { |
Sergey Senozhatsky | fe8eb12 | 2014-04-07 15:38:15 -0700 | [diff] [blame] | 208 | pr_info("Cannot change max compression streams\n"); |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 209 | ret = -EINVAL; |
| 210 | goto out; |
| 211 | } |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 212 | } |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 213 | |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 214 | zram->max_comp_streams = num; |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 215 | ret = len; |
| 216 | out: |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 217 | up_write(&zram->init_lock); |
Minchan Kim | 60a726e | 2014-04-07 15:38:21 -0700 | [diff] [blame] | 218 | return ret; |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 219 | } |
| 220 | |
Sergey Senozhatsky | e46b8a0 | 2014-04-07 15:38:17 -0700 | [diff] [blame] | 221 | static ssize_t comp_algorithm_show(struct device *dev, |
| 222 | struct device_attribute *attr, char *buf) |
| 223 | { |
| 224 | size_t sz; |
| 225 | struct zram *zram = dev_to_zram(dev); |
| 226 | |
| 227 | down_read(&zram->init_lock); |
| 228 | sz = zcomp_available_show(zram->compressor, buf); |
| 229 | up_read(&zram->init_lock); |
| 230 | |
| 231 | return sz; |
| 232 | } |
| 233 | |
| 234 | static ssize_t comp_algorithm_store(struct device *dev, |
| 235 | struct device_attribute *attr, const char *buf, size_t len) |
| 236 | { |
| 237 | struct zram *zram = dev_to_zram(dev); |
| 238 | down_write(&zram->init_lock); |
| 239 | if (init_done(zram)) { |
| 240 | up_write(&zram->init_lock); |
| 241 | pr_info("Can't change algorithm for initialized device\n"); |
| 242 | return -EBUSY; |
| 243 | } |
| 244 | strlcpy(zram->compressor, buf, sizeof(zram->compressor)); |
| 245 | up_write(&zram->init_lock); |
| 246 | return len; |
| 247 | } |
| 248 | |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 249 | /* flag operations needs meta->tb_lock */ |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 250 | static int zram_test_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 251 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 252 | { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 253 | return meta->table[index].value & BIT(flag); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 254 | } |
| 255 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 256 | static void zram_set_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 257 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 258 | { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 259 | meta->table[index].value |= BIT(flag); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 260 | } |
| 261 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 262 | static void zram_clear_flag(struct zram_meta *meta, u32 index, |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 263 | enum zram_pageflags flag) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 264 | { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 265 | meta->table[index].value &= ~BIT(flag); |
| 266 | } |
| 267 | |
| 268 | static size_t zram_get_obj_size(struct zram_meta *meta, u32 index) |
| 269 | { |
| 270 | return meta->table[index].value & (BIT(ZRAM_FLAG_SHIFT) - 1); |
| 271 | } |
| 272 | |
| 273 | static void zram_set_obj_size(struct zram_meta *meta, |
| 274 | u32 index, size_t size) |
| 275 | { |
| 276 | unsigned long flags = meta->table[index].value >> ZRAM_FLAG_SHIFT; |
| 277 | |
| 278 | meta->table[index].value = (flags << ZRAM_FLAG_SHIFT) | size; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 279 | } |
| 280 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 281 | static inline int is_partial_io(struct bio_vec *bvec) |
| 282 | { |
| 283 | return bvec->bv_len != PAGE_SIZE; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Check if request is within bounds and aligned on zram logical blocks. |
| 288 | */ |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 289 | static inline int valid_io_request(struct zram *zram, |
| 290 | sector_t start, unsigned int size) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 291 | { |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 292 | u64 end, bound; |
Kumar Gaurav | a539c72 | 2013-08-08 23:53:24 +0530 | [diff] [blame] | 293 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 294 | /* unaligned request */ |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 295 | if (unlikely(start & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1))) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 296 | return 0; |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 297 | if (unlikely(size & (ZRAM_LOGICAL_BLOCK_SIZE - 1))) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 298 | return 0; |
| 299 | |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 300 | end = start + (size >> SECTOR_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 301 | bound = zram->disksize >> SECTOR_SHIFT; |
| 302 | /* out of range range */ |
Sergey Senozhatsky | 75c7caf | 2013-06-22 17:21:00 +0300 | [diff] [blame] | 303 | if (unlikely(start >= bound || end > bound || start > end)) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 304 | return 0; |
| 305 | |
| 306 | /* I/O request is valid */ |
| 307 | return 1; |
| 308 | } |
| 309 | |
Ganesh Mahendran | 1fec117 | 2015-02-12 15:00:33 -0800 | [diff] [blame] | 310 | static void zram_meta_free(struct zram_meta *meta, u64 disksize) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 311 | { |
Ganesh Mahendran | 1fec117 | 2015-02-12 15:00:33 -0800 | [diff] [blame] | 312 | size_t num_pages = disksize >> PAGE_SHIFT; |
| 313 | size_t index; |
| 314 | |
| 315 | /* Free all pages that are still in this zram device */ |
| 316 | for (index = 0; index < num_pages; index++) { |
| 317 | unsigned long handle = meta->table[index].handle; |
| 318 | |
| 319 | if (!handle) |
| 320 | continue; |
| 321 | |
| 322 | zs_free(meta->mem_pool, handle); |
| 323 | } |
| 324 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 325 | zs_destroy_pool(meta->mem_pool); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 326 | vfree(meta->table); |
| 327 | kfree(meta); |
| 328 | } |
| 329 | |
Ganesh Mahendran | 3eba0c6 | 2015-02-12 15:00:51 -0800 | [diff] [blame] | 330 | static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize) |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 331 | { |
| 332 | size_t num_pages; |
Ganesh Mahendran | 3eba0c6 | 2015-02-12 15:00:51 -0800 | [diff] [blame] | 333 | char pool_name[8]; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 334 | struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL); |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 335 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 336 | if (!meta) |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 337 | return NULL; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 338 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 339 | num_pages = disksize >> PAGE_SHIFT; |
| 340 | meta->table = vzalloc(num_pages * sizeof(*meta->table)); |
| 341 | if (!meta->table) { |
| 342 | pr_err("Error allocating zram address table\n"); |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 343 | goto out_error; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 344 | } |
| 345 | |
Ganesh Mahendran | 3eba0c6 | 2015-02-12 15:00:51 -0800 | [diff] [blame] | 346 | snprintf(pool_name, sizeof(pool_name), "zram%d", device_id); |
| 347 | meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 348 | if (!meta->mem_pool) { |
| 349 | pr_err("Error creating memory pool\n"); |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 350 | goto out_error; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 351 | } |
| 352 | |
| 353 | return meta; |
| 354 | |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 355 | out_error: |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 356 | vfree(meta->table); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 357 | kfree(meta); |
Sergey Senozhatsky | b817995 | 2015-02-12 15:00:31 -0800 | [diff] [blame] | 358 | return NULL; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 359 | } |
| 360 | |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 361 | static inline bool zram_meta_get(struct zram *zram) |
| 362 | { |
| 363 | if (atomic_inc_not_zero(&zram->refcount)) |
| 364 | return true; |
| 365 | return false; |
| 366 | } |
| 367 | |
| 368 | static inline void zram_meta_put(struct zram *zram) |
| 369 | { |
| 370 | atomic_dec(&zram->refcount); |
| 371 | } |
| 372 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 373 | static void update_position(u32 *index, int *offset, struct bio_vec *bvec) |
| 374 | { |
| 375 | if (*offset + bvec->bv_len >= PAGE_SIZE) |
| 376 | (*index)++; |
| 377 | *offset = (*offset + bvec->bv_len) % PAGE_SIZE; |
| 378 | } |
| 379 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 380 | static int page_zero_filled(void *ptr) |
| 381 | { |
| 382 | unsigned int pos; |
| 383 | unsigned long *page; |
| 384 | |
| 385 | page = (unsigned long *)ptr; |
| 386 | |
| 387 | for (pos = 0; pos != PAGE_SIZE / sizeof(*page); pos++) { |
| 388 | if (page[pos]) |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | return 1; |
| 393 | } |
| 394 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 395 | static void handle_zero_page(struct bio_vec *bvec) |
| 396 | { |
| 397 | struct page *page = bvec->bv_page; |
| 398 | void *user_mem; |
| 399 | |
| 400 | user_mem = kmap_atomic(page); |
| 401 | if (is_partial_io(bvec)) |
| 402 | memset(user_mem + bvec->bv_offset, 0, bvec->bv_len); |
| 403 | else |
| 404 | clear_page(user_mem); |
| 405 | kunmap_atomic(user_mem); |
| 406 | |
| 407 | flush_dcache_page(page); |
| 408 | } |
| 409 | |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 410 | |
| 411 | /* |
| 412 | * To protect concurrent access to the same index entry, |
| 413 | * caller should hold this table index entry's bit_spinlock to |
| 414 | * indicate this index entry is accessing. |
| 415 | */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 416 | static void zram_free_page(struct zram *zram, size_t index) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 417 | { |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 418 | struct zram_meta *meta = zram->meta; |
| 419 | unsigned long handle = meta->table[index].handle; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 420 | |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 421 | if (unlikely(!handle)) { |
Nitin Gupta | 2e88228 | 2010-01-28 21:13:41 +0530 | [diff] [blame] | 422 | /* |
| 423 | * No memory is allocated for zero filled pages. |
| 424 | * Simply clear zero page flag. |
| 425 | */ |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 426 | if (zram_test_flag(meta, index, ZRAM_ZERO)) { |
| 427 | zram_clear_flag(meta, index, ZRAM_ZERO); |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 428 | atomic64_dec(&zram->stats.zero_pages); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 429 | } |
| 430 | return; |
| 431 | } |
| 432 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 433 | zs_free(meta->mem_pool, handle); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 434 | |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 435 | atomic64_sub(zram_get_obj_size(meta, index), |
| 436 | &zram->stats.compr_data_size); |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 437 | atomic64_dec(&zram->stats.pages_stored); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 438 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 439 | meta->table[index].handle = 0; |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 440 | zram_set_obj_size(meta, index, 0); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 441 | } |
| 442 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 443 | static int zram_decompress_page(struct zram *zram, char *mem, u32 index) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 444 | { |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 445 | int ret = 0; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 446 | unsigned char *cmem; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 447 | struct zram_meta *meta = zram->meta; |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 448 | unsigned long handle; |
Minchan Kim | 023b409 | 2014-08-06 16:08:29 -0700 | [diff] [blame] | 449 | size_t size; |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 450 | |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 451 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 452 | handle = meta->table[index].handle; |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 453 | size = zram_get_obj_size(meta, index); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 454 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 455 | if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 456 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 457 | clear_page(mem); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 458 | return 0; |
| 459 | } |
| 460 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 461 | cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_RO); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 462 | if (size == PAGE_SIZE) |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 463 | copy_page(mem, cmem); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 464 | else |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 465 | ret = zcomp_decompress(zram->comp, cmem, size, mem); |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 466 | zs_unmap_object(meta->mem_pool, handle); |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 467 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 468 | |
| 469 | /* Should NEVER happen. Return bio error if it does. */ |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 470 | if (unlikely(ret)) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 471 | pr_err("Decompression failed! err=%d, page=%u\n", ret, index); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 472 | return ret; |
| 473 | } |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 478 | static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec, |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 479 | u32 index, int offset) |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 480 | { |
| 481 | int ret; |
| 482 | struct page *page; |
| 483 | unsigned char *user_mem, *uncmem = NULL; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 484 | struct zram_meta *meta = zram->meta; |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 485 | page = bvec->bv_page; |
| 486 | |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 487 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 488 | if (unlikely(!meta->table[index].handle) || |
| 489 | zram_test_flag(meta, index, ZRAM_ZERO)) { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 490 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 491 | handle_zero_page(bvec); |
| 492 | return 0; |
| 493 | } |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 494 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 495 | |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 496 | if (is_partial_io(bvec)) |
| 497 | /* Use a temporary buffer to decompress the page */ |
Minchan Kim | 7e5a510 | 2013-01-30 11:41:39 +0900 | [diff] [blame] | 498 | uncmem = kmalloc(PAGE_SIZE, GFP_NOIO); |
| 499 | |
| 500 | user_mem = kmap_atomic(page); |
| 501 | if (!is_partial_io(bvec)) |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 502 | uncmem = user_mem; |
| 503 | |
| 504 | if (!uncmem) { |
| 505 | pr_info("Unable to allocate temp memory\n"); |
| 506 | ret = -ENOMEM; |
| 507 | goto out_cleanup; |
| 508 | } |
| 509 | |
| 510 | ret = zram_decompress_page(zram, uncmem, index); |
| 511 | /* Should NEVER happen. Return bio error if it does. */ |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 512 | if (unlikely(ret)) |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 513 | goto out_cleanup; |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 514 | |
| 515 | if (is_partial_io(bvec)) |
| 516 | memcpy(user_mem + bvec->bv_offset, uncmem + offset, |
| 517 | bvec->bv_len); |
| 518 | |
| 519 | flush_dcache_page(page); |
| 520 | ret = 0; |
| 521 | out_cleanup: |
| 522 | kunmap_atomic(user_mem); |
| 523 | if (is_partial_io(bvec)) |
| 524 | kfree(uncmem); |
| 525 | return ret; |
| 526 | } |
| 527 | |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 528 | static inline void update_used_max(struct zram *zram, |
| 529 | const unsigned long pages) |
| 530 | { |
| 531 | int old_max, cur_max; |
| 532 | |
| 533 | old_max = atomic_long_read(&zram->stats.max_used_pages); |
| 534 | |
| 535 | do { |
| 536 | cur_max = old_max; |
| 537 | if (pages > cur_max) |
| 538 | old_max = atomic_long_cmpxchg( |
| 539 | &zram->stats.max_used_pages, cur_max, pages); |
| 540 | } while (old_max != cur_max); |
| 541 | } |
| 542 | |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 543 | static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index, |
| 544 | int offset) |
| 545 | { |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 546 | int ret = 0; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 547 | size_t clen; |
Minchan Kim | c234434 | 2012-06-08 15:39:25 +0900 | [diff] [blame] | 548 | unsigned long handle; |
Minchan Kim | 130f315 | 2012-06-08 15:39:27 +0900 | [diff] [blame] | 549 | struct page *page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 550 | unsigned char *user_mem, *cmem, *src, *uncmem = NULL; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 551 | struct zram_meta *meta = zram->meta; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 552 | struct zcomp_strm *zstrm; |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 553 | bool locked = false; |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 554 | unsigned long alloced_pages; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 555 | |
| 556 | page = bvec->bv_page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 557 | if (is_partial_io(bvec)) { |
| 558 | /* |
| 559 | * This is a partial IO. We need to read the full page |
| 560 | * before to write the changes. |
| 561 | */ |
Minchan Kim | 7e5a510 | 2013-01-30 11:41:39 +0900 | [diff] [blame] | 562 | uncmem = kmalloc(PAGE_SIZE, GFP_NOIO); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 563 | if (!uncmem) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 564 | ret = -ENOMEM; |
| 565 | goto out; |
| 566 | } |
Sergey Senozhatsky | 37b51fd | 2012-10-30 22:40:23 +0300 | [diff] [blame] | 567 | ret = zram_decompress_page(zram, uncmem, index); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 568 | if (ret) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 569 | goto out; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 570 | } |
| 571 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 572 | zstrm = zcomp_strm_find(zram->comp); |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 573 | locked = true; |
Cong Wang | ba82fe2 | 2011-11-25 23:14:25 +0800 | [diff] [blame] | 574 | user_mem = kmap_atomic(page); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 575 | |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 576 | if (is_partial_io(bvec)) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 577 | memcpy(uncmem + offset, user_mem + bvec->bv_offset, |
| 578 | bvec->bv_len); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 579 | kunmap_atomic(user_mem); |
| 580 | user_mem = NULL; |
| 581 | } else { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 582 | uncmem = user_mem; |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 583 | } |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 584 | |
| 585 | if (page_zero_filled(uncmem)) { |
Weijie Yang | c406515 | 2014-11-13 15:19:05 -0800 | [diff] [blame] | 586 | if (user_mem) |
| 587 | kunmap_atomic(user_mem); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 588 | /* Free memory associated with this sector now. */ |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 589 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 590 | zram_free_page(zram, index); |
Minchan Kim | 9296747 | 2014-01-30 15:46:03 -0800 | [diff] [blame] | 591 | zram_set_flag(meta, index, ZRAM_ZERO); |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 592 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 593 | |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 594 | atomic64_inc(&zram->stats.zero_pages); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 595 | ret = 0; |
| 596 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 597 | } |
| 598 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 599 | ret = zcomp_compress(zram->comp, zstrm, uncmem, &clen); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 600 | if (!is_partial_io(bvec)) { |
| 601 | kunmap_atomic(user_mem); |
| 602 | user_mem = NULL; |
| 603 | uncmem = NULL; |
| 604 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 605 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 606 | if (unlikely(ret)) { |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 607 | pr_err("Compression failed! err=%d\n", ret); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 608 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 609 | } |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 610 | src = zstrm->buffer; |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 611 | if (unlikely(clen > max_zpage_size)) { |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 612 | clen = PAGE_SIZE; |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 613 | if (is_partial_io(bvec)) |
| 614 | src = uncmem; |
Nitin Gupta | c8f2f0d | 2012-10-10 17:42:18 -0700 | [diff] [blame] | 615 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 616 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 617 | handle = zs_malloc(meta->mem_pool, clen); |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 618 | if (!handle) { |
Marlies Ruck | 596b3dd | 2013-05-16 14:30:39 -0400 | [diff] [blame] | 619 | pr_info("Error allocating memory for compressed page: %u, size=%zu\n", |
| 620 | index, clen); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 621 | ret = -ENOMEM; |
| 622 | goto out; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 623 | } |
Minchan Kim | 9ada9da | 2014-10-09 15:29:53 -0700 | [diff] [blame] | 624 | |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 625 | alloced_pages = zs_get_total_pages(meta->mem_pool); |
| 626 | if (zram->limit_pages && alloced_pages > zram->limit_pages) { |
Minchan Kim | 9ada9da | 2014-10-09 15:29:53 -0700 | [diff] [blame] | 627 | zs_free(meta->mem_pool, handle); |
| 628 | ret = -ENOMEM; |
| 629 | goto out; |
| 630 | } |
| 631 | |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 632 | update_used_max(zram, alloced_pages); |
| 633 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 634 | cmem = zs_map_object(meta->mem_pool, handle, ZS_MM_WO); |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 635 | |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 636 | if ((clen == PAGE_SIZE) && !is_partial_io(bvec)) { |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 637 | src = kmap_atomic(page); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 638 | copy_page(cmem, src); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 639 | kunmap_atomic(src); |
Jiang Liu | 42e99bd | 2013-06-07 00:07:30 +0800 | [diff] [blame] | 640 | } else { |
| 641 | memcpy(cmem, src, clen); |
| 642 | } |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 643 | |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 644 | zcomp_strm_release(zram->comp, zstrm); |
| 645 | locked = false; |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 646 | zs_unmap_object(meta->mem_pool, handle); |
Nitin Gupta | fd1a30d | 2012-01-09 16:51:59 -0600 | [diff] [blame] | 647 | |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 648 | /* |
| 649 | * Free memory associated with this sector |
| 650 | * before overwriting unused sectors. |
| 651 | */ |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 652 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Sunghan Suh | f40ac2a | 2013-07-03 20:10:05 +0900 | [diff] [blame] | 653 | zram_free_page(zram, index); |
| 654 | |
Minchan Kim | 8b3cc3e | 2013-02-06 08:48:53 +0900 | [diff] [blame] | 655 | meta->table[index].handle = handle; |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 656 | zram_set_obj_size(meta, index, clen); |
| 657 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 658 | |
| 659 | /* Update stats */ |
Sergey Senozhatsky | 90a7806 | 2014-04-07 15:38:03 -0700 | [diff] [blame] | 660 | atomic64_add(clen, &zram->stats.compr_data_size); |
| 661 | atomic64_inc(&zram->stats.pages_stored); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 662 | out: |
Minchan Kim | e46e331 | 2014-01-30 15:46:06 -0800 | [diff] [blame] | 663 | if (locked) |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 664 | zcomp_strm_release(zram->comp, zstrm); |
Nitin Gupta | 397c606 | 2013-01-02 08:53:41 -0800 | [diff] [blame] | 665 | if (is_partial_io(bvec)) |
| 666 | kfree(uncmem); |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 667 | return ret; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index, |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 671 | int offset, int rw) |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 672 | { |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 673 | int ret; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 674 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 675 | if (rw == READ) { |
| 676 | atomic64_inc(&zram->stats.num_reads); |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 677 | ret = zram_bvec_read(zram, bvec, index, offset); |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 678 | } else { |
| 679 | atomic64_inc(&zram->stats.num_writes); |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 680 | ret = zram_bvec_write(zram, bvec, index, offset); |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 681 | } |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 682 | |
Chao Yu | 0cf1e9d | 2014-08-29 15:18:37 -0700 | [diff] [blame] | 683 | if (unlikely(ret)) { |
| 684 | if (rw == READ) |
| 685 | atomic64_inc(&zram->stats.failed_reads); |
| 686 | else |
| 687 | atomic64_inc(&zram->stats.failed_writes); |
| 688 | } |
| 689 | |
Jerome Marchand | c5bde23 | 2011-06-10 15:28:49 +0200 | [diff] [blame] | 690 | return ret; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 691 | } |
| 692 | |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 693 | /* |
| 694 | * zram_bio_discard - handler on discard request |
| 695 | * @index: physical block index in PAGE_SIZE units |
| 696 | * @offset: byte offset within physical block |
| 697 | */ |
| 698 | static void zram_bio_discard(struct zram *zram, u32 index, |
| 699 | int offset, struct bio *bio) |
| 700 | { |
| 701 | size_t n = bio->bi_iter.bi_size; |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 702 | struct zram_meta *meta = zram->meta; |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 703 | |
| 704 | /* |
| 705 | * zram manages data in physical block size units. Because logical block |
| 706 | * size isn't identical with physical block size on some arch, we |
| 707 | * could get a discard request pointing to a specific offset within a |
| 708 | * certain physical block. Although we can handle this request by |
| 709 | * reading that physiclal block and decompressing and partially zeroing |
| 710 | * and re-compressing and then re-storing it, this isn't reasonable |
| 711 | * because our intent with a discard request is to save memory. So |
| 712 | * skipping this logical block is appropriate here. |
| 713 | */ |
| 714 | if (offset) { |
Weijie Yang | 38515c7 | 2014-06-04 16:11:06 -0700 | [diff] [blame] | 715 | if (n <= (PAGE_SIZE - offset)) |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 716 | return; |
| 717 | |
Weijie Yang | 38515c7 | 2014-06-04 16:11:06 -0700 | [diff] [blame] | 718 | n -= (PAGE_SIZE - offset); |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 719 | index++; |
| 720 | } |
| 721 | |
| 722 | while (n >= PAGE_SIZE) { |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 723 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 724 | zram_free_page(zram, index); |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 725 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Sergey Senozhatsky | 015254d | 2014-10-09 15:29:57 -0700 | [diff] [blame] | 726 | atomic64_inc(&zram->stats.notify_free); |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 727 | index++; |
| 728 | n -= PAGE_SIZE; |
| 729 | } |
| 730 | } |
| 731 | |
Sergey Senozhatsky | ba6b17d | 2015-02-12 15:00:36 -0800 | [diff] [blame] | 732 | static void zram_reset_device(struct zram *zram) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 733 | { |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 734 | struct zram_meta *meta; |
| 735 | struct zcomp *comp; |
| 736 | u64 disksize; |
| 737 | |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 738 | down_write(&zram->init_lock); |
Minchan Kim | 9ada9da | 2014-10-09 15:29:53 -0700 | [diff] [blame] | 739 | |
| 740 | zram->limit_pages = 0; |
| 741 | |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 742 | if (!init_done(zram)) { |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 743 | up_write(&zram->init_lock); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 744 | return; |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 745 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 746 | |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 747 | meta = zram->meta; |
| 748 | comp = zram->comp; |
| 749 | disksize = zram->disksize; |
| 750 | /* |
| 751 | * Refcount will go down to 0 eventually and r/w handler |
| 752 | * cannot handle further I/O so it will bail out by |
| 753 | * check zram_meta_get. |
| 754 | */ |
| 755 | zram_meta_put(zram); |
| 756 | /* |
| 757 | * We want to free zram_meta in process context to avoid |
| 758 | * deadlock between reclaim path and any other locks. |
| 759 | */ |
| 760 | wait_event(zram->io_done, atomic_read(&zram->refcount) == 0); |
| 761 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 762 | /* Reset stats */ |
| 763 | memset(&zram->stats, 0, sizeof(zram->stats)); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 764 | zram->disksize = 0; |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 765 | zram->max_comp_streams = 1; |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 766 | set_capacity(zram->disk, 0); |
| 767 | |
Sergey Senozhatsky | 644d478 | 2013-06-26 15:28:39 +0300 | [diff] [blame] | 768 | up_write(&zram->init_lock); |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 769 | /* I/O operation under all of CPU are done so let's free */ |
| 770 | zram_meta_free(meta, disksize); |
| 771 | zcomp_destroy(comp); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 772 | } |
| 773 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 774 | static ssize_t disksize_store(struct device *dev, |
| 775 | struct device_attribute *attr, const char *buf, size_t len) |
| 776 | { |
| 777 | u64 disksize; |
Sergey Senozhatsky | d61f98c | 2014-04-07 15:38:19 -0700 | [diff] [blame] | 778 | struct zcomp *comp; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 779 | struct zram_meta *meta; |
| 780 | struct zram *zram = dev_to_zram(dev); |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 781 | int err; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 782 | |
| 783 | disksize = memparse(buf, NULL); |
| 784 | if (!disksize) |
| 785 | return -EINVAL; |
| 786 | |
| 787 | disksize = PAGE_ALIGN(disksize); |
Ganesh Mahendran | 3eba0c6 | 2015-02-12 15:00:51 -0800 | [diff] [blame] | 788 | meta = zram_meta_alloc(zram->disk->first_minor, disksize); |
Minchan Kim | db5d711 | 2014-03-03 15:38:34 -0800 | [diff] [blame] | 789 | if (!meta) |
| 790 | return -ENOMEM; |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 791 | |
Sergey Senozhatsky | d61f98c | 2014-04-07 15:38:19 -0700 | [diff] [blame] | 792 | comp = zcomp_create(zram->compressor, zram->max_comp_streams); |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 793 | if (IS_ERR(comp)) { |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 794 | pr_info("Cannot initialise %s compressing backend\n", |
Sergey Senozhatsky | e46b8a0 | 2014-04-07 15:38:17 -0700 | [diff] [blame] | 795 | zram->compressor); |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 796 | err = PTR_ERR(comp); |
| 797 | goto out_free_meta; |
Sergey Senozhatsky | d61f98c | 2014-04-07 15:38:19 -0700 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | down_write(&zram->init_lock); |
| 801 | if (init_done(zram)) { |
Sergey Senozhatsky | d61f98c | 2014-04-07 15:38:19 -0700 | [diff] [blame] | 802 | pr_info("Cannot change disksize for initialized device\n"); |
| 803 | err = -EBUSY; |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 804 | goto out_destroy_comp; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 805 | } |
| 806 | |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 807 | init_waitqueue_head(&zram->io_done); |
| 808 | atomic_set(&zram->refcount, 1); |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 809 | zram->meta = meta; |
Sergey Senozhatsky | d61f98c | 2014-04-07 15:38:19 -0700 | [diff] [blame] | 810 | zram->comp = comp; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 811 | zram->disksize = disksize; |
| 812 | set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 813 | up_write(&zram->init_lock); |
Minchan Kim | b4c5c60 | 2014-07-23 14:00:04 -0700 | [diff] [blame] | 814 | |
| 815 | /* |
| 816 | * Revalidate disk out of the init_lock to avoid lockdep splat. |
| 817 | * It's okay because disk's capacity is protected by init_lock |
| 818 | * so that revalidate_disk always sees up-to-date capacity. |
| 819 | */ |
| 820 | revalidate_disk(zram->disk); |
| 821 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 822 | return len; |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 823 | |
Sergey Senozhatsky | fcfa8d9 | 2014-04-07 15:38:20 -0700 | [diff] [blame] | 824 | out_destroy_comp: |
| 825 | up_write(&zram->init_lock); |
| 826 | zcomp_destroy(comp); |
| 827 | out_free_meta: |
Ganesh Mahendran | 1fec117 | 2015-02-12 15:00:33 -0800 | [diff] [blame] | 828 | zram_meta_free(meta, disksize); |
Sergey Senozhatsky | b7ca232 | 2014-04-07 15:38:12 -0700 | [diff] [blame] | 829 | return err; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | static ssize_t reset_store(struct device *dev, |
| 833 | struct device_attribute *attr, const char *buf, size_t len) |
| 834 | { |
| 835 | int ret; |
| 836 | unsigned short do_reset; |
| 837 | struct zram *zram; |
| 838 | struct block_device *bdev; |
| 839 | |
| 840 | zram = dev_to_zram(dev); |
| 841 | bdev = bdget_disk(zram->disk, 0); |
| 842 | |
Rashika Kheria | 46a51c8 | 2013-10-30 18:36:32 +0530 | [diff] [blame] | 843 | if (!bdev) |
| 844 | return -ENOMEM; |
| 845 | |
Sergey Senozhatsky | ba6b17d | 2015-02-12 15:00:36 -0800 | [diff] [blame] | 846 | mutex_lock(&bdev->bd_mutex); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 847 | /* Do not reset an active device! */ |
Minchan Kim | 2b269ce | 2015-02-12 15:00:42 -0800 | [diff] [blame] | 848 | if (bdev->bd_openers) { |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 849 | ret = -EBUSY; |
| 850 | goto out; |
| 851 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 852 | |
| 853 | ret = kstrtou16(buf, 10, &do_reset); |
| 854 | if (ret) |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 855 | goto out; |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 856 | |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 857 | if (!do_reset) { |
| 858 | ret = -EINVAL; |
| 859 | goto out; |
| 860 | } |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 861 | |
| 862 | /* Make sure all pending I/O is finished */ |
Rashika Kheria | 46a51c8 | 2013-10-30 18:36:32 +0530 | [diff] [blame] | 863 | fsync_bdev(bdev); |
Sergey Senozhatsky | ba6b17d | 2015-02-12 15:00:36 -0800 | [diff] [blame] | 864 | zram_reset_device(zram); |
Sergey Senozhatsky | ba6b17d | 2015-02-12 15:00:36 -0800 | [diff] [blame] | 865 | |
| 866 | mutex_unlock(&bdev->bd_mutex); |
| 867 | revalidate_disk(zram->disk); |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 868 | bdput(bdev); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 869 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 870 | return len; |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 871 | |
| 872 | out: |
Sergey Senozhatsky | ba6b17d | 2015-02-12 15:00:36 -0800 | [diff] [blame] | 873 | mutex_unlock(&bdev->bd_mutex); |
Rashika Kheria | 1b67222 | 2013-11-10 22:13:53 +0530 | [diff] [blame] | 874 | bdput(bdev); |
| 875 | return ret; |
Jerome Marchand | 8c921b2 | 2011-06-10 15:28:47 +0200 | [diff] [blame] | 876 | } |
| 877 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 878 | static void __zram_make_request(struct zram *zram, struct bio *bio) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 879 | { |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 880 | int offset, rw; |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 881 | u32 index; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 882 | struct bio_vec bvec; |
| 883 | struct bvec_iter iter; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 884 | |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 885 | index = bio->bi_iter.bi_sector >> SECTORS_PER_PAGE_SHIFT; |
| 886 | offset = (bio->bi_iter.bi_sector & |
| 887 | (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 888 | |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 889 | if (unlikely(bio->bi_rw & REQ_DISCARD)) { |
| 890 | zram_bio_discard(zram, index, offset, bio); |
| 891 | bio_endio(bio, 0); |
| 892 | return; |
| 893 | } |
| 894 | |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 895 | rw = bio_data_dir(bio); |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 896 | bio_for_each_segment(bvec, bio, iter) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 897 | int max_transfer_size = PAGE_SIZE - offset; |
| 898 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 899 | if (bvec.bv_len > max_transfer_size) { |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 900 | /* |
| 901 | * zram_bvec_rw() can only make operation on a single |
| 902 | * zram page. Split the bio vector. |
| 903 | */ |
| 904 | struct bio_vec bv; |
| 905 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 906 | bv.bv_page = bvec.bv_page; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 907 | bv.bv_len = max_transfer_size; |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 908 | bv.bv_offset = bvec.bv_offset; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 909 | |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 910 | if (zram_bvec_rw(zram, &bv, index, offset, rw) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 911 | goto out; |
| 912 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 913 | bv.bv_len = bvec.bv_len - max_transfer_size; |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 914 | bv.bv_offset += max_transfer_size; |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 915 | if (zram_bvec_rw(zram, &bv, index + 1, 0, rw) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 916 | goto out; |
| 917 | } else |
karam.lee | b627cff | 2014-12-12 16:56:47 -0800 | [diff] [blame] | 918 | if (zram_bvec_rw(zram, &bvec, index, offset, rw) < 0) |
Jerome Marchand | 924bd88 | 2011-06-10 15:28:48 +0200 | [diff] [blame] | 919 | goto out; |
| 920 | |
Kent Overstreet | 7988613 | 2013-11-23 17:19:00 -0800 | [diff] [blame] | 921 | update_position(&index, &offset, &bvec); |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 922 | } |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 923 | |
| 924 | set_bit(BIO_UPTODATE, &bio->bi_flags); |
| 925 | bio_endio(bio, 0); |
Nitin Gupta | 7d7854b | 2011-01-22 07:36:15 -0500 | [diff] [blame] | 926 | return; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 927 | |
| 928 | out: |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 929 | bio_io_error(bio); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 930 | } |
| 931 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 932 | /* |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 933 | * Handler function for all zram I/O requests. |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 934 | */ |
Christoph Hellwig | 5a7bbad | 2011-09-12 12:12:01 +0200 | [diff] [blame] | 935 | static void zram_make_request(struct request_queue *queue, struct bio *bio) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 936 | { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 937 | struct zram *zram = queue->queuedata; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 938 | |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 939 | if (unlikely(!zram_meta_get(zram))) |
Minchan Kim | 3de738c | 2013-01-30 11:41:41 +0900 | [diff] [blame] | 940 | goto error; |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 941 | |
karam.lee | 54850e7 | 2014-12-12 16:56:50 -0800 | [diff] [blame] | 942 | if (!valid_io_request(zram, bio->bi_iter.bi_sector, |
| 943 | bio->bi_iter.bi_size)) { |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 944 | atomic64_inc(&zram->stats.invalid_io); |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 945 | goto put_zram; |
Jerome Marchand | 6642a67 | 2011-02-17 17:11:49 +0100 | [diff] [blame] | 946 | } |
| 947 | |
Sergey Senozhatsky | be257c6 | 2014-04-07 15:38:01 -0700 | [diff] [blame] | 948 | __zram_make_request(zram, bio); |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 949 | zram_meta_put(zram); |
Linus Torvalds | b4fdcb0 | 2011-11-04 17:06:58 -0700 | [diff] [blame] | 950 | return; |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 951 | put_zram: |
| 952 | zram_meta_put(zram); |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 953 | error: |
| 954 | bio_io_error(bio); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 955 | } |
| 956 | |
Nitin Gupta | 2ccbec0 | 2011-09-09 19:01:00 -0400 | [diff] [blame] | 957 | static void zram_slot_free_notify(struct block_device *bdev, |
| 958 | unsigned long index) |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 959 | { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 960 | struct zram *zram; |
Minchan Kim | f614a9f | 2014-01-30 15:46:04 -0800 | [diff] [blame] | 961 | struct zram_meta *meta; |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 962 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 963 | zram = bdev->bd_disk->private_data; |
Minchan Kim | f614a9f | 2014-01-30 15:46:04 -0800 | [diff] [blame] | 964 | meta = zram->meta; |
| 965 | |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 966 | bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value); |
Minchan Kim | f614a9f | 2014-01-30 15:46:04 -0800 | [diff] [blame] | 967 | zram_free_page(zram, index); |
Weijie Yang | d2d5e76 | 2014-08-06 16:08:31 -0700 | [diff] [blame] | 968 | bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value); |
Jiang Liu | da5cc7d | 2013-06-07 00:07:31 +0800 | [diff] [blame] | 969 | atomic64_inc(&zram->stats.notify_free); |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 970 | } |
| 971 | |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 972 | static int zram_rw_page(struct block_device *bdev, sector_t sector, |
| 973 | struct page *page, int rw) |
| 974 | { |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 975 | int offset, err = -EIO; |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 976 | u32 index; |
| 977 | struct zram *zram; |
| 978 | struct bio_vec bv; |
| 979 | |
| 980 | zram = bdev->bd_disk->private_data; |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 981 | if (unlikely(!zram_meta_get(zram))) |
| 982 | goto out; |
| 983 | |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 984 | if (!valid_io_request(zram, sector, PAGE_SIZE)) { |
| 985 | atomic64_inc(&zram->stats.invalid_io); |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 986 | err = -EINVAL; |
| 987 | goto put_zram; |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 988 | } |
| 989 | |
| 990 | index = sector >> SECTORS_PER_PAGE_SHIFT; |
| 991 | offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT; |
| 992 | |
| 993 | bv.bv_page = page; |
| 994 | bv.bv_len = PAGE_SIZE; |
| 995 | bv.bv_offset = 0; |
| 996 | |
| 997 | err = zram_bvec_rw(zram, &bv, index, offset, rw); |
Minchan Kim | 08eee69 | 2015-02-12 15:00:45 -0800 | [diff] [blame] | 998 | put_zram: |
| 999 | zram_meta_put(zram); |
| 1000 | out: |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 1001 | /* |
| 1002 | * If I/O fails, just return error(ie, non-zero) without |
| 1003 | * calling page_endio. |
| 1004 | * It causes resubmit the I/O with bio request by upper functions |
| 1005 | * of rw_page(e.g., swap_readpage, __swap_writepage) and |
| 1006 | * bio->bi_end_io does things to handle the error |
| 1007 | * (e.g., SetPageError, set_page_dirty and extra works). |
| 1008 | */ |
| 1009 | if (err == 0) |
| 1010 | page_endio(page, rw, 0); |
| 1011 | return err; |
| 1012 | } |
| 1013 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1014 | static const struct block_device_operations zram_devops = { |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1015 | .swap_slot_free_notify = zram_slot_free_notify, |
karam.lee | 8c7f010 | 2014-12-12 16:56:53 -0800 | [diff] [blame] | 1016 | .rw_page = zram_rw_page, |
Nitin Gupta | 107c161 | 2010-05-17 11:02:44 +0530 | [diff] [blame] | 1017 | .owner = THIS_MODULE |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1018 | }; |
| 1019 | |
Ganesh Mahendran | 083914e | 2014-12-12 16:57:13 -0800 | [diff] [blame] | 1020 | static DEVICE_ATTR_RW(disksize); |
| 1021 | static DEVICE_ATTR_RO(initstate); |
| 1022 | static DEVICE_ATTR_WO(reset); |
| 1023 | static DEVICE_ATTR_RO(orig_data_size); |
| 1024 | static DEVICE_ATTR_RO(mem_used_total); |
| 1025 | static DEVICE_ATTR_RW(mem_limit); |
| 1026 | static DEVICE_ATTR_RW(mem_used_max); |
| 1027 | static DEVICE_ATTR_RW(max_comp_streams); |
| 1028 | static DEVICE_ATTR_RW(comp_algorithm); |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 1029 | |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 1030 | ZRAM_ATTR_RO(num_reads); |
| 1031 | ZRAM_ATTR_RO(num_writes); |
Sergey Senozhatsky | 6444724 | 2014-04-07 15:38:05 -0700 | [diff] [blame] | 1032 | ZRAM_ATTR_RO(failed_reads); |
| 1033 | ZRAM_ATTR_RO(failed_writes); |
Sergey Senozhatsky | a68eb3b | 2014-04-07 15:38:04 -0700 | [diff] [blame] | 1034 | ZRAM_ATTR_RO(invalid_io); |
| 1035 | ZRAM_ATTR_RO(notify_free); |
| 1036 | ZRAM_ATTR_RO(zero_pages); |
| 1037 | ZRAM_ATTR_RO(compr_data_size); |
| 1038 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 1039 | static struct attribute *zram_disk_attrs[] = { |
| 1040 | &dev_attr_disksize.attr, |
| 1041 | &dev_attr_initstate.attr, |
| 1042 | &dev_attr_reset.attr, |
| 1043 | &dev_attr_num_reads.attr, |
| 1044 | &dev_attr_num_writes.attr, |
Sergey Senozhatsky | 6444724 | 2014-04-07 15:38:05 -0700 | [diff] [blame] | 1045 | &dev_attr_failed_reads.attr, |
| 1046 | &dev_attr_failed_writes.attr, |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 1047 | &dev_attr_invalid_io.attr, |
| 1048 | &dev_attr_notify_free.attr, |
| 1049 | &dev_attr_zero_pages.attr, |
| 1050 | &dev_attr_orig_data_size.attr, |
| 1051 | &dev_attr_compr_data_size.attr, |
| 1052 | &dev_attr_mem_used_total.attr, |
Minchan Kim | 9ada9da | 2014-10-09 15:29:53 -0700 | [diff] [blame] | 1053 | &dev_attr_mem_limit.attr, |
Minchan Kim | 461a8ee | 2014-10-09 15:29:55 -0700 | [diff] [blame] | 1054 | &dev_attr_mem_used_max.attr, |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 1055 | &dev_attr_max_comp_streams.attr, |
Sergey Senozhatsky | e46b8a0 | 2014-04-07 15:38:17 -0700 | [diff] [blame] | 1056 | &dev_attr_comp_algorithm.attr, |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 1057 | NULL, |
| 1058 | }; |
| 1059 | |
| 1060 | static struct attribute_group zram_disk_attr_group = { |
| 1061 | .attrs = zram_disk_attrs, |
| 1062 | }; |
| 1063 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1064 | static int create_device(struct zram *zram, int device_id) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1065 | { |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1066 | struct request_queue *queue; |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 1067 | int ret = -ENOMEM; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1068 | |
Jerome Marchand | 0900bea | 2011-09-06 15:02:11 +0200 | [diff] [blame] | 1069 | init_rwsem(&zram->init_lock); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1070 | |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1071 | queue = blk_alloc_queue(GFP_KERNEL); |
| 1072 | if (!queue) { |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1073 | pr_err("Error allocating disk queue for device %d\n", |
| 1074 | device_id); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1075 | goto out; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1076 | } |
| 1077 | |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1078 | blk_queue_make_request(queue, zram_make_request); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1079 | |
| 1080 | /* gendisk structure */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1081 | zram->disk = alloc_disk(1); |
| 1082 | if (!zram->disk) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 1083 | pr_warn("Error allocating disk structure for device %d\n", |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1084 | device_id); |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 1085 | goto out_free_queue; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1086 | } |
| 1087 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1088 | zram->disk->major = zram_major; |
| 1089 | zram->disk->first_minor = device_id; |
| 1090 | zram->disk->fops = &zram_devops; |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1091 | zram->disk->queue = queue; |
| 1092 | zram->disk->queue->queuedata = zram; |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1093 | zram->disk->private_data = zram; |
| 1094 | snprintf(zram->disk->disk_name, 16, "zram%d", device_id); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1095 | |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 1096 | /* Actual capacity set using syfs (/sys/block/zram<id>/disksize */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1097 | set_capacity(zram->disk, 0); |
Sergey Senozhatsky | b67d1ec | 2014-04-07 15:38:09 -0700 | [diff] [blame] | 1098 | /* zram devices sort of resembles non-rotational disks */ |
| 1099 | queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue); |
Mike Snitzer | b277da0 | 2014-10-04 10:55:32 -0600 | [diff] [blame] | 1100 | queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, zram->disk->queue); |
Nitin Gupta | a1dd52a | 2010-06-01 13:31:23 +0530 | [diff] [blame] | 1101 | /* |
| 1102 | * To ensure that we always get PAGE_SIZE aligned |
| 1103 | * and n*PAGE_SIZED sized I/O requests. |
| 1104 | */ |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1105 | blk_queue_physical_block_size(zram->disk->queue, PAGE_SIZE); |
Robert Jennings | 7b19b8d | 2011-01-28 08:58:17 -0600 | [diff] [blame] | 1106 | blk_queue_logical_block_size(zram->disk->queue, |
| 1107 | ZRAM_LOGICAL_BLOCK_SIZE); |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1108 | blk_queue_io_min(zram->disk->queue, PAGE_SIZE); |
| 1109 | blk_queue_io_opt(zram->disk->queue, PAGE_SIZE); |
Joonsoo Kim | f4659d8 | 2014-04-07 15:38:24 -0700 | [diff] [blame] | 1110 | zram->disk->queue->limits.discard_granularity = PAGE_SIZE; |
| 1111 | zram->disk->queue->limits.max_discard_sectors = UINT_MAX; |
| 1112 | /* |
| 1113 | * zram_bio_discard() will clear all logical blocks if logical block |
| 1114 | * size is identical with physical block size(PAGE_SIZE). But if it is |
| 1115 | * different, we will skip discarding some parts of logical blocks in |
| 1116 | * the part of the request range which isn't aligned to physical block |
| 1117 | * size. So we can't ensure that all discarded logical blocks are |
| 1118 | * zeroed. |
| 1119 | */ |
| 1120 | if (ZRAM_LOGICAL_BLOCK_SIZE == PAGE_SIZE) |
| 1121 | zram->disk->queue->limits.discard_zeroes_data = 1; |
| 1122 | else |
| 1123 | zram->disk->queue->limits.discard_zeroes_data = 0; |
| 1124 | queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, zram->disk->queue); |
Nitin Gupta | 5d83d5a | 2010-01-28 21:13:39 +0530 | [diff] [blame] | 1125 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1126 | add_disk(zram->disk); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1127 | |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 1128 | ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, |
| 1129 | &zram_disk_attr_group); |
| 1130 | if (ret < 0) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 1131 | pr_warn("Error creating sysfs group"); |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 1132 | goto out_free_disk; |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 1133 | } |
Sergey Senozhatsky | e46b8a0 | 2014-04-07 15:38:17 -0700 | [diff] [blame] | 1134 | strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor)); |
Sergey Senozhatsky | be2d1d5 | 2014-04-07 15:38:00 -0700 | [diff] [blame] | 1135 | zram->meta = NULL; |
Sergey Senozhatsky | beca3ec | 2014-04-07 15:38:14 -0700 | [diff] [blame] | 1136 | zram->max_comp_streams = 1; |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 1137 | return 0; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1138 | |
Jiang Liu | 39a9b8a | 2013-06-07 00:07:24 +0800 | [diff] [blame] | 1139 | out_free_disk: |
| 1140 | del_gendisk(zram->disk); |
| 1141 | put_disk(zram->disk); |
| 1142 | out_free_queue: |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1143 | blk_cleanup_queue(queue); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1144 | out: |
| 1145 | return ret; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1146 | } |
| 1147 | |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1148 | static void destroy_devices(unsigned int nr) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1149 | { |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1150 | struct zram *zram; |
| 1151 | unsigned int i; |
Nitin Gupta | 33863c2 | 2010-08-09 22:56:47 +0530 | [diff] [blame] | 1152 | |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1153 | for (i = 0; i < nr; i++) { |
| 1154 | zram = &zram_devices[i]; |
| 1155 | /* |
| 1156 | * Remove sysfs first, so no one will perform a disksize |
| 1157 | * store while we destroy the devices |
| 1158 | */ |
| 1159 | sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, |
| 1160 | &zram_disk_attr_group); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1161 | |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1162 | zram_reset_device(zram); |
| 1163 | |
Sergey Senozhatsky | ee980160 | 2015-02-12 15:00:48 -0800 | [diff] [blame] | 1164 | blk_cleanup_queue(zram->disk->queue); |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1165 | del_gendisk(zram->disk); |
| 1166 | put_disk(zram->disk); |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1167 | } |
| 1168 | |
| 1169 | kfree(zram_devices); |
| 1170 | unregister_blkdev(zram_major, "zram"); |
| 1171 | pr_info("Destroyed %u device(s)\n", nr); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1172 | } |
| 1173 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1174 | static int __init zram_init(void) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1175 | { |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1176 | int ret, dev_id; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1177 | |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 1178 | if (num_devices > max_num_devices) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 1179 | pr_warn("Invalid value for num_devices: %u\n", |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 1180 | num_devices); |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1181 | return -EINVAL; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1182 | } |
| 1183 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1184 | zram_major = register_blkdev(0, "zram"); |
| 1185 | if (zram_major <= 0) { |
Sam Hansen | 94b8435 | 2012-06-07 16:03:47 -0700 | [diff] [blame] | 1186 | pr_warn("Unable to get major number\n"); |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1187 | return -EBUSY; |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1188 | } |
| 1189 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1190 | /* Allocate the device array and initialize each one */ |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 1191 | zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL); |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 1192 | if (!zram_devices) { |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1193 | unregister_blkdev(zram_major, "zram"); |
| 1194 | return -ENOMEM; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1195 | } |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1196 | |
Nitin Gupta | 5fa5a90 | 2012-02-12 23:04:45 -0500 | [diff] [blame] | 1197 | for (dev_id = 0; dev_id < num_devices; dev_id++) { |
Noah Watkins | 43801f6 | 2011-07-20 17:05:57 -0600 | [diff] [blame] | 1198 | ret = create_device(&zram_devices[dev_id], dev_id); |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1199 | if (ret) |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1200 | goto out_error; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1201 | } |
| 1202 | |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1203 | pr_info("Created %u device(s)\n", num_devices); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1204 | return 0; |
Nitin Gupta | de1a21a | 2010-01-28 21:13:40 +0530 | [diff] [blame] | 1205 | |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1206 | out_error: |
| 1207 | destroy_devices(dev_id); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1208 | return ret; |
| 1209 | } |
| 1210 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1211 | static void __exit zram_exit(void) |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1212 | { |
Sergey Senozhatsky | a096caf | 2015-02-12 15:00:39 -0800 | [diff] [blame] | 1213 | destroy_devices(num_devices); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1214 | } |
| 1215 | |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1216 | module_init(zram_init); |
| 1217 | module_exit(zram_exit); |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1218 | |
Sergey Senozhatsky | 9b3bb7a | 2013-06-22 03:21:18 +0300 | [diff] [blame] | 1219 | module_param(num_devices, uint, 0); |
| 1220 | MODULE_PARM_DESC(num_devices, "Number of zram devices"); |
| 1221 | |
Nitin Gupta | 306b0c9 | 2009-09-22 10:26:53 +0530 | [diff] [blame] | 1222 | MODULE_LICENSE("Dual BSD/GPL"); |
| 1223 | MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>"); |
Nitin Gupta | f1e3cff | 2010-06-01 13:31:25 +0530 | [diff] [blame] | 1224 | MODULE_DESCRIPTION("Compressed RAM Block Device"); |