Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 2 | /* |
| 3 | * fs/ext4/extents_status.c |
| 4 | * |
| 5 | * Written by Yongqiang Yang <xiaoqiangnk@gmail.com> |
| 6 | * Modified by |
| 7 | * Allison Henderson <achender@linux.vnet.ibm.com> |
| 8 | * Hugh Dickins <hughd@google.com> |
| 9 | * Zheng Liu <wenqing.lz@taobao.com> |
| 10 | * |
| 11 | * Ext4 extents status tree core functions. |
| 12 | */ |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 13 | #include <linux/list_sort.h> |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 14 | #include <linux/proc_fs.h> |
| 15 | #include <linux/seq_file.h> |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 16 | #include "ext4.h" |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 17 | |
Zheng Liu | 992e9fd | 2012-11-08 21:57:33 -0500 | [diff] [blame] | 18 | #include <trace/events/ext4.h> |
| 19 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 20 | /* |
| 21 | * According to previous discussion in Ext4 Developer Workshop, we |
| 22 | * will introduce a new structure called io tree to track all extent |
| 23 | * status in order to solve some problems that we have met |
| 24 | * (e.g. Reservation space warning), and provide extent-level locking. |
| 25 | * Delay extent tree is the first step to achieve this goal. It is |
| 26 | * original built by Yongqiang Yang. At that time it is called delay |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 27 | * extent tree, whose goal is only track delayed extents in memory to |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 28 | * simplify the implementation of fiemap and bigalloc, and introduce |
| 29 | * lseek SEEK_DATA/SEEK_HOLE support. That is why it is still called |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 30 | * delay extent tree at the first commit. But for better understand |
| 31 | * what it does, it has been rename to extent status tree. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 32 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 33 | * Step1: |
| 34 | * Currently the first step has been done. All delayed extents are |
| 35 | * tracked in the tree. It maintains the delayed extent when a delayed |
| 36 | * allocation is issued, and the delayed extent is written out or |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 37 | * invalidated. Therefore the implementation of fiemap and bigalloc |
| 38 | * are simplified, and SEEK_DATA/SEEK_HOLE are introduced. |
| 39 | * |
| 40 | * The following comment describes the implemenmtation of extent |
| 41 | * status tree and future works. |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 42 | * |
| 43 | * Step2: |
| 44 | * In this step all extent status are tracked by extent status tree. |
| 45 | * Thus, we can first try to lookup a block mapping in this tree before |
| 46 | * finding it in extent tree. Hence, single extent cache can be removed |
| 47 | * because extent status tree can do a better job. Extents in status |
| 48 | * tree are loaded on-demand. Therefore, the extent status tree may not |
| 49 | * contain all of the extents in a file. Meanwhile we define a shrinker |
| 50 | * to reclaim memory from extent status tree because fragmented extent |
| 51 | * tree will make status tree cost too much memory. written/unwritten/- |
| 52 | * hole extents in the tree will be reclaimed by this shrinker when we |
| 53 | * are under high memory pressure. Delayed extents will not be |
| 54 | * reclimed because fiemap, bigalloc, and seek_data/hole need it. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 55 | */ |
| 56 | |
| 57 | /* |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 58 | * Extent status tree implementation for ext4. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 59 | * |
| 60 | * |
| 61 | * ========================================================================== |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 62 | * Extent status tree tracks all extent status. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 63 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 64 | * 1. Why we need to implement extent status tree? |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 65 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 66 | * Without extent status tree, ext4 identifies a delayed extent by looking |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 67 | * up page cache, this has several deficiencies - complicated, buggy, |
| 68 | * and inefficient code. |
| 69 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 70 | * FIEMAP, SEEK_HOLE/DATA, bigalloc, and writeout all need to know if a |
| 71 | * block or a range of blocks are belonged to a delayed extent. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 72 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 73 | * Let us have a look at how they do without extent status tree. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 74 | * -- FIEMAP |
| 75 | * FIEMAP looks up page cache to identify delayed allocations from holes. |
| 76 | * |
| 77 | * -- SEEK_HOLE/DATA |
| 78 | * SEEK_HOLE/DATA has the same problem as FIEMAP. |
| 79 | * |
| 80 | * -- bigalloc |
| 81 | * bigalloc looks up page cache to figure out if a block is |
| 82 | * already under delayed allocation or not to determine whether |
| 83 | * quota reserving is needed for the cluster. |
| 84 | * |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 85 | * -- writeout |
| 86 | * Writeout looks up whole page cache to see if a buffer is |
| 87 | * mapped, If there are not very many delayed buffers, then it is |
Masahiro Yamada | 3f8b6fb | 2017-02-27 14:29:25 -0800 | [diff] [blame] | 88 | * time consuming. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 89 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 90 | * With extent status tree implementation, FIEMAP, SEEK_HOLE/DATA, |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 91 | * bigalloc and writeout can figure out if a block or a range of |
| 92 | * blocks is under delayed allocation(belonged to a delayed extent) or |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 93 | * not by searching the extent tree. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 94 | * |
| 95 | * |
| 96 | * ========================================================================== |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 97 | * 2. Ext4 extent status tree impelmentation |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 98 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 99 | * -- extent |
| 100 | * A extent is a range of blocks which are contiguous logically and |
| 101 | * physically. Unlike extent in extent tree, this extent in ext4 is |
| 102 | * a in-memory struct, there is no corresponding on-disk data. There |
| 103 | * is no limit on length of extent, so an extent can contain as many |
| 104 | * blocks as they are contiguous logically and physically. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 105 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 106 | * -- extent status tree |
| 107 | * Every inode has an extent status tree and all allocation blocks |
| 108 | * are added to the tree with different status. The extent in the |
| 109 | * tree are ordered by logical block no. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 110 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 111 | * -- operations on a extent status tree |
| 112 | * There are three important operations on a delayed extent tree: find |
| 113 | * next extent, adding a extent(a range of blocks) and removing a extent. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 114 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 115 | * -- race on a extent status tree |
| 116 | * Extent status tree is protected by inode->i_es_lock. |
| 117 | * |
| 118 | * -- memory consumption |
| 119 | * Fragmented extent tree will make extent status tree cost too much |
| 120 | * memory. Hence, we will reclaim written/unwritten/hole extents from |
| 121 | * the tree under a heavy memory pressure. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 122 | * |
| 123 | * |
| 124 | * ========================================================================== |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 125 | * 3. Performance analysis |
| 126 | * |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 127 | * -- overhead |
| 128 | * 1. There is a cache extent for write access, so if writes are |
| 129 | * not very random, adding space operaions are in O(1) time. |
| 130 | * |
| 131 | * -- gain |
| 132 | * 2. Code is much simpler, more readable, more maintainable and |
| 133 | * more efficient. |
| 134 | * |
| 135 | * |
| 136 | * ========================================================================== |
| 137 | * 4. TODO list |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 138 | * |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 139 | * -- Refactor delayed space reservation |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 140 | * |
| 141 | * -- Extent-level locking |
| 142 | */ |
| 143 | |
| 144 | static struct kmem_cache *ext4_es_cachep; |
| 145 | |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 146 | static int __es_insert_extent(struct inode *inode, struct extent_status *newes); |
| 147 | static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 148 | ext4_lblk_t end); |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 149 | static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan); |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 150 | static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan, |
| 151 | struct ext4_inode_info *locked_ei); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 152 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 153 | int __init ext4_init_es(void) |
| 154 | { |
Theodore Ts'o | 2463077 | 2013-02-28 23:58:56 -0500 | [diff] [blame] | 155 | ext4_es_cachep = kmem_cache_create("ext4_extent_status", |
| 156 | sizeof(struct extent_status), |
| 157 | 0, (SLAB_RECLAIM_ACCOUNT), NULL); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 158 | if (ext4_es_cachep == NULL) |
| 159 | return -ENOMEM; |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | void ext4_exit_es(void) |
| 164 | { |
| 165 | if (ext4_es_cachep) |
| 166 | kmem_cache_destroy(ext4_es_cachep); |
| 167 | } |
| 168 | |
| 169 | void ext4_es_init_tree(struct ext4_es_tree *tree) |
| 170 | { |
| 171 | tree->root = RB_ROOT; |
| 172 | tree->cache_es = NULL; |
| 173 | } |
| 174 | |
| 175 | #ifdef ES_DEBUG__ |
| 176 | static void ext4_es_print_tree(struct inode *inode) |
| 177 | { |
| 178 | struct ext4_es_tree *tree; |
| 179 | struct rb_node *node; |
| 180 | |
| 181 | printk(KERN_DEBUG "status extents for inode %lu:", inode->i_ino); |
| 182 | tree = &EXT4_I(inode)->i_es_tree; |
| 183 | node = rb_first(&tree->root); |
| 184 | while (node) { |
| 185 | struct extent_status *es; |
| 186 | es = rb_entry(node, struct extent_status, rb_node); |
Eric Whitney | ce140cd | 2014-02-20 16:09:12 -0500 | [diff] [blame] | 187 | printk(KERN_DEBUG " [%u/%u) %llu %x", |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 188 | es->es_lblk, es->es_len, |
| 189 | ext4_es_pblock(es), ext4_es_status(es)); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 190 | node = rb_next(node); |
| 191 | } |
| 192 | printk(KERN_DEBUG "\n"); |
| 193 | } |
| 194 | #else |
| 195 | #define ext4_es_print_tree(inode) |
| 196 | #endif |
| 197 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 198 | static inline ext4_lblk_t ext4_es_end(struct extent_status *es) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 199 | { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 200 | BUG_ON(es->es_lblk + es->es_len < es->es_lblk); |
| 201 | return es->es_lblk + es->es_len - 1; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | /* |
| 205 | * search through the tree for an delayed extent with a given offset. If |
| 206 | * it can't be found, try to find next extent. |
| 207 | */ |
| 208 | static struct extent_status *__es_tree_search(struct rb_root *root, |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 209 | ext4_lblk_t lblk) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 210 | { |
| 211 | struct rb_node *node = root->rb_node; |
| 212 | struct extent_status *es = NULL; |
| 213 | |
| 214 | while (node) { |
| 215 | es = rb_entry(node, struct extent_status, rb_node); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 216 | if (lblk < es->es_lblk) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 217 | node = node->rb_left; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 218 | else if (lblk > ext4_es_end(es)) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 219 | node = node->rb_right; |
| 220 | else |
| 221 | return es; |
| 222 | } |
| 223 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 224 | if (es && lblk < es->es_lblk) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 225 | return es; |
| 226 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 227 | if (es && lblk > ext4_es_end(es)) { |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 228 | node = rb_next(&es->rb_node); |
| 229 | return node ? rb_entry(node, struct extent_status, rb_node) : |
| 230 | NULL; |
| 231 | } |
| 232 | |
| 233 | return NULL; |
| 234 | } |
| 235 | |
| 236 | /* |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 237 | * ext4_es_find_delayed_extent_range: find the 1st delayed extent covering |
| 238 | * @es->lblk if it exists, otherwise, the next extent after @es->lblk. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 239 | * |
| 240 | * @inode: the inode which owns delayed extents |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 241 | * @lblk: the offset where we start to search |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 242 | * @end: the offset where we stop to search |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 243 | * @es: delayed extent that we found |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 244 | */ |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 245 | void ext4_es_find_delayed_extent_range(struct inode *inode, |
| 246 | ext4_lblk_t lblk, ext4_lblk_t end, |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 247 | struct extent_status *es) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 248 | { |
| 249 | struct ext4_es_tree *tree = NULL; |
| 250 | struct extent_status *es1 = NULL; |
| 251 | struct rb_node *node; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 252 | |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 253 | BUG_ON(es == NULL); |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 254 | BUG_ON(end < lblk); |
| 255 | trace_ext4_es_find_delayed_extent_range_enter(inode, lblk); |
Zheng Liu | 992e9fd | 2012-11-08 21:57:33 -0500 | [diff] [blame] | 256 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 257 | read_lock(&EXT4_I(inode)->i_es_lock); |
| 258 | tree = &EXT4_I(inode)->i_es_tree; |
| 259 | |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 260 | /* find extent in cache firstly */ |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 261 | es->es_lblk = es->es_len = es->es_pblk = 0; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 262 | if (tree->cache_es) { |
| 263 | es1 = tree->cache_es; |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 264 | if (in_range(lblk, es1->es_lblk, es1->es_len)) { |
Theodore Ts'o | 3be78c7 | 2013-08-16 21:22:41 -0400 | [diff] [blame] | 265 | es_debug("%u cached by [%u/%u) %llu %x\n", |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 266 | lblk, es1->es_lblk, es1->es_len, |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 267 | ext4_es_pblock(es1), ext4_es_status(es1)); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 268 | goto out; |
| 269 | } |
| 270 | } |
| 271 | |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 272 | es1 = __es_tree_search(&tree->root, lblk); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 273 | |
| 274 | out: |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 275 | if (es1 && !ext4_es_is_delayed(es1)) { |
| 276 | while ((node = rb_next(&es1->rb_node)) != NULL) { |
| 277 | es1 = rb_entry(node, struct extent_status, rb_node); |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 278 | if (es1->es_lblk > end) { |
| 279 | es1 = NULL; |
| 280 | break; |
| 281 | } |
Zheng Liu | be40136 | 2013-02-18 00:27:26 -0500 | [diff] [blame] | 282 | if (ext4_es_is_delayed(es1)) |
| 283 | break; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | if (es1 && ext4_es_is_delayed(es1)) { |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 288 | tree->cache_es = es1; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 289 | es->es_lblk = es1->es_lblk; |
| 290 | es->es_len = es1->es_len; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 291 | es->es_pblk = es1->es_pblk; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | read_unlock(&EXT4_I(inode)->i_es_lock); |
Zheng Liu | 992e9fd | 2012-11-08 21:57:33 -0500 | [diff] [blame] | 295 | |
Yan, Zheng | e30b5dc | 2013-05-03 02:15:52 -0400 | [diff] [blame] | 296 | trace_ext4_es_find_delayed_extent_range_exit(inode, es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 297 | } |
| 298 | |
Jan Kara | b0dea4c | 2014-11-25 11:49:25 -0500 | [diff] [blame] | 299 | static void ext4_es_list_add(struct inode *inode) |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 300 | { |
| 301 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 302 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 303 | |
| 304 | if (!list_empty(&ei->i_es_list)) |
| 305 | return; |
| 306 | |
| 307 | spin_lock(&sbi->s_es_lock); |
| 308 | if (list_empty(&ei->i_es_list)) { |
| 309 | list_add_tail(&ei->i_es_list, &sbi->s_es_list); |
| 310 | sbi->s_es_nr_inode++; |
| 311 | } |
| 312 | spin_unlock(&sbi->s_es_lock); |
| 313 | } |
| 314 | |
Jan Kara | b0dea4c | 2014-11-25 11:49:25 -0500 | [diff] [blame] | 315 | static void ext4_es_list_del(struct inode *inode) |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 316 | { |
| 317 | struct ext4_inode_info *ei = EXT4_I(inode); |
| 318 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 319 | |
| 320 | spin_lock(&sbi->s_es_lock); |
| 321 | if (!list_empty(&ei->i_es_list)) { |
| 322 | list_del_init(&ei->i_es_list); |
| 323 | sbi->s_es_nr_inode--; |
| 324 | WARN_ON_ONCE(sbi->s_es_nr_inode < 0); |
| 325 | } |
| 326 | spin_unlock(&sbi->s_es_lock); |
| 327 | } |
| 328 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 329 | static struct extent_status * |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 330 | ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len, |
| 331 | ext4_fsblk_t pblk) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 332 | { |
| 333 | struct extent_status *es; |
| 334 | es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC); |
| 335 | if (es == NULL) |
| 336 | return NULL; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 337 | es->es_lblk = lblk; |
| 338 | es->es_len = len; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 339 | es->es_pblk = pblk; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 340 | |
| 341 | /* |
| 342 | * We don't count delayed extent because we never try to reclaim them |
| 343 | */ |
Theodore Ts'o | 2463077 | 2013-02-28 23:58:56 -0500 | [diff] [blame] | 344 | if (!ext4_es_is_delayed(es)) { |
Jan Kara | b0dea4c | 2014-11-25 11:49:25 -0500 | [diff] [blame] | 345 | if (!EXT4_I(inode)->i_es_shk_nr++) |
| 346 | ext4_es_list_add(inode); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 347 | percpu_counter_inc(&EXT4_SB(inode->i_sb)-> |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 348 | s_es_stats.es_stats_shk_cnt); |
Theodore Ts'o | 2463077 | 2013-02-28 23:58:56 -0500 | [diff] [blame] | 349 | } |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 350 | |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 351 | EXT4_I(inode)->i_es_all_nr++; |
| 352 | percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt); |
| 353 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 354 | return es; |
| 355 | } |
| 356 | |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 357 | static void ext4_es_free_extent(struct inode *inode, struct extent_status *es) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 358 | { |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 359 | EXT4_I(inode)->i_es_all_nr--; |
| 360 | percpu_counter_dec(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt); |
| 361 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 362 | /* Decrease the shrink counter when this es is not delayed */ |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 363 | if (!ext4_es_is_delayed(es)) { |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 364 | BUG_ON(EXT4_I(inode)->i_es_shk_nr == 0); |
Jan Kara | b0dea4c | 2014-11-25 11:49:25 -0500 | [diff] [blame] | 365 | if (!--EXT4_I(inode)->i_es_shk_nr) |
| 366 | ext4_es_list_del(inode); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 367 | percpu_counter_dec(&EXT4_SB(inode->i_sb)-> |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 368 | s_es_stats.es_stats_shk_cnt); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 369 | } |
| 370 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 371 | kmem_cache_free(ext4_es_cachep, es); |
| 372 | } |
| 373 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 374 | /* |
| 375 | * Check whether or not two extents can be merged |
| 376 | * Condition: |
| 377 | * - logical block number is contiguous |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 378 | * - physical block number is contiguous |
| 379 | * - status is equal |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 380 | */ |
| 381 | static int ext4_es_can_be_merged(struct extent_status *es1, |
| 382 | struct extent_status *es2) |
| 383 | { |
Jan Kara | 2be12de | 2014-11-25 11:55:24 -0500 | [diff] [blame] | 384 | if (ext4_es_type(es1) != ext4_es_type(es2)) |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 385 | return 0; |
| 386 | |
Lukas Czerner | 0baaea6 | 2014-05-12 22:21:43 -0400 | [diff] [blame] | 387 | if (((__u64) es1->es_len) + es2->es_len > EXT_MAX_BLOCKS) { |
| 388 | pr_warn("ES assertion failed when merging extents. " |
| 389 | "The sum of lengths of es1 (%d) and es2 (%d) " |
| 390 | "is bigger than allowed file size (%d)\n", |
| 391 | es1->es_len, es2->es_len, EXT_MAX_BLOCKS); |
| 392 | WARN_ON(1); |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 393 | return 0; |
Lukas Czerner | 0baaea6 | 2014-05-12 22:21:43 -0400 | [diff] [blame] | 394 | } |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 395 | |
Zheng Liu | bd38436 | 2013-03-10 20:48:59 -0400 | [diff] [blame] | 396 | if (((__u64) es1->es_lblk) + es1->es_len != es2->es_lblk) |
| 397 | return 0; |
| 398 | |
| 399 | if ((ext4_es_is_written(es1) || ext4_es_is_unwritten(es1)) && |
| 400 | (ext4_es_pblock(es1) + es1->es_len == ext4_es_pblock(es2))) |
| 401 | return 1; |
| 402 | |
| 403 | if (ext4_es_is_hole(es1)) |
| 404 | return 1; |
| 405 | |
| 406 | /* we need to check delayed extent is without unwritten status */ |
| 407 | if (ext4_es_is_delayed(es1) && !ext4_es_is_unwritten(es1)) |
| 408 | return 1; |
| 409 | |
| 410 | return 0; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 411 | } |
| 412 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 413 | static struct extent_status * |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 414 | ext4_es_try_to_merge_left(struct inode *inode, struct extent_status *es) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 415 | { |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 416 | struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 417 | struct extent_status *es1; |
| 418 | struct rb_node *node; |
| 419 | |
| 420 | node = rb_prev(&es->rb_node); |
| 421 | if (!node) |
| 422 | return es; |
| 423 | |
| 424 | es1 = rb_entry(node, struct extent_status, rb_node); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 425 | if (ext4_es_can_be_merged(es1, es)) { |
| 426 | es1->es_len += es->es_len; |
Jan Kara | 2be12de | 2014-11-25 11:55:24 -0500 | [diff] [blame] | 427 | if (ext4_es_is_referenced(es)) |
| 428 | ext4_es_set_referenced(es1); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 429 | rb_erase(&es->rb_node, &tree->root); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 430 | ext4_es_free_extent(inode, es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 431 | es = es1; |
| 432 | } |
| 433 | |
| 434 | return es; |
| 435 | } |
| 436 | |
| 437 | static struct extent_status * |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 438 | ext4_es_try_to_merge_right(struct inode *inode, struct extent_status *es) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 439 | { |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 440 | struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 441 | struct extent_status *es1; |
| 442 | struct rb_node *node; |
| 443 | |
| 444 | node = rb_next(&es->rb_node); |
| 445 | if (!node) |
| 446 | return es; |
| 447 | |
| 448 | es1 = rb_entry(node, struct extent_status, rb_node); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 449 | if (ext4_es_can_be_merged(es, es1)) { |
| 450 | es->es_len += es1->es_len; |
Jan Kara | 2be12de | 2014-11-25 11:55:24 -0500 | [diff] [blame] | 451 | if (ext4_es_is_referenced(es1)) |
| 452 | ext4_es_set_referenced(es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 453 | rb_erase(node, &tree->root); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 454 | ext4_es_free_extent(inode, es1); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | return es; |
| 458 | } |
| 459 | |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 460 | #ifdef ES_AGGRESSIVE_TEST |
Zheng Liu | d7b2a00 | 2013-08-28 14:47:06 -0400 | [diff] [blame] | 461 | #include "ext4_extents.h" /* Needed when ES_AGGRESSIVE_TEST is defined */ |
| 462 | |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 463 | static void ext4_es_insert_extent_ext_check(struct inode *inode, |
| 464 | struct extent_status *es) |
| 465 | { |
| 466 | struct ext4_ext_path *path = NULL; |
| 467 | struct ext4_extent *ex; |
| 468 | ext4_lblk_t ee_block; |
| 469 | ext4_fsblk_t ee_start; |
| 470 | unsigned short ee_len; |
| 471 | int depth, ee_status, es_status; |
| 472 | |
Theodore Ts'o | ed8a1a7 | 2014-09-01 14:43:09 -0400 | [diff] [blame] | 473 | path = ext4_find_extent(inode, es->es_lblk, NULL, EXT4_EX_NOCACHE); |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 474 | if (IS_ERR(path)) |
| 475 | return; |
| 476 | |
| 477 | depth = ext_depth(inode); |
| 478 | ex = path[depth].p_ext; |
| 479 | |
| 480 | if (ex) { |
| 481 | |
| 482 | ee_block = le32_to_cpu(ex->ee_block); |
| 483 | ee_start = ext4_ext_pblock(ex); |
| 484 | ee_len = ext4_ext_get_actual_len(ex); |
| 485 | |
Lukas Czerner | 556615d | 2014-04-20 23:45:47 -0400 | [diff] [blame] | 486 | ee_status = ext4_ext_is_unwritten(ex) ? 1 : 0; |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 487 | es_status = ext4_es_is_unwritten(es) ? 1 : 0; |
| 488 | |
| 489 | /* |
| 490 | * Make sure ex and es are not overlap when we try to insert |
| 491 | * a delayed/hole extent. |
| 492 | */ |
| 493 | if (!ext4_es_is_written(es) && !ext4_es_is_unwritten(es)) { |
| 494 | if (in_range(es->es_lblk, ee_block, ee_len)) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 495 | pr_warn("ES insert assertion failed for " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 496 | "inode: %lu we can find an extent " |
| 497 | "at block [%d/%d/%llu/%c], but we " |
Eric Whitney | ce140cd | 2014-02-20 16:09:12 -0500 | [diff] [blame] | 498 | "want to add a delayed/hole extent " |
| 499 | "[%d/%d/%llu/%x]\n", |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 500 | inode->i_ino, ee_block, ee_len, |
| 501 | ee_start, ee_status ? 'u' : 'w', |
| 502 | es->es_lblk, es->es_len, |
| 503 | ext4_es_pblock(es), ext4_es_status(es)); |
| 504 | } |
| 505 | goto out; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * We don't check ee_block == es->es_lblk, etc. because es |
| 510 | * might be a part of whole extent, vice versa. |
| 511 | */ |
| 512 | if (es->es_lblk < ee_block || |
| 513 | ext4_es_pblock(es) != ee_start + es->es_lblk - ee_block) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 514 | pr_warn("ES insert assertion failed for inode: %lu " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 515 | "ex_status [%d/%d/%llu/%c] != " |
| 516 | "es_status [%d/%d/%llu/%c]\n", inode->i_ino, |
| 517 | ee_block, ee_len, ee_start, |
| 518 | ee_status ? 'u' : 'w', es->es_lblk, es->es_len, |
| 519 | ext4_es_pblock(es), es_status ? 'u' : 'w'); |
| 520 | goto out; |
| 521 | } |
| 522 | |
| 523 | if (ee_status ^ es_status) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 524 | pr_warn("ES insert assertion failed for inode: %lu " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 525 | "ex_status [%d/%d/%llu/%c] != " |
| 526 | "es_status [%d/%d/%llu/%c]\n", inode->i_ino, |
| 527 | ee_block, ee_len, ee_start, |
| 528 | ee_status ? 'u' : 'w', es->es_lblk, es->es_len, |
| 529 | ext4_es_pblock(es), es_status ? 'u' : 'w'); |
| 530 | } |
| 531 | } else { |
| 532 | /* |
| 533 | * We can't find an extent on disk. So we need to make sure |
| 534 | * that we don't want to add an written/unwritten extent. |
| 535 | */ |
| 536 | if (!ext4_es_is_delayed(es) && !ext4_es_is_hole(es)) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 537 | pr_warn("ES insert assertion failed for inode: %lu " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 538 | "can't find an extent at block %d but we want " |
Eric Whitney | ce140cd | 2014-02-20 16:09:12 -0500 | [diff] [blame] | 539 | "to add a written/unwritten extent " |
| 540 | "[%d/%d/%llu/%x]\n", inode->i_ino, |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 541 | es->es_lblk, es->es_lblk, es->es_len, |
| 542 | ext4_es_pblock(es), ext4_es_status(es)); |
| 543 | } |
| 544 | } |
| 545 | out: |
Theodore Ts'o | b7ea89a | 2014-09-01 14:39:09 -0400 | [diff] [blame] | 546 | ext4_ext_drop_refs(path); |
| 547 | kfree(path); |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static void ext4_es_insert_extent_ind_check(struct inode *inode, |
| 551 | struct extent_status *es) |
| 552 | { |
| 553 | struct ext4_map_blocks map; |
| 554 | int retval; |
| 555 | |
| 556 | /* |
| 557 | * Here we call ext4_ind_map_blocks to lookup a block mapping because |
| 558 | * 'Indirect' structure is defined in indirect.c. So we couldn't |
| 559 | * access direct/indirect tree from outside. It is too dirty to define |
| 560 | * this function in indirect.c file. |
| 561 | */ |
| 562 | |
| 563 | map.m_lblk = es->es_lblk; |
| 564 | map.m_len = es->es_len; |
| 565 | |
| 566 | retval = ext4_ind_map_blocks(NULL, inode, &map, 0); |
| 567 | if (retval > 0) { |
| 568 | if (ext4_es_is_delayed(es) || ext4_es_is_hole(es)) { |
| 569 | /* |
| 570 | * We want to add a delayed/hole extent but this |
| 571 | * block has been allocated. |
| 572 | */ |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 573 | pr_warn("ES insert assertion failed for inode: %lu " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 574 | "We can find blocks but we want to add a " |
Eric Whitney | ce140cd | 2014-02-20 16:09:12 -0500 | [diff] [blame] | 575 | "delayed/hole extent [%d/%d/%llu/%x]\n", |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 576 | inode->i_ino, es->es_lblk, es->es_len, |
| 577 | ext4_es_pblock(es), ext4_es_status(es)); |
| 578 | return; |
| 579 | } else if (ext4_es_is_written(es)) { |
| 580 | if (retval != es->es_len) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 581 | pr_warn("ES insert assertion failed for " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 582 | "inode: %lu retval %d != es_len %d\n", |
| 583 | inode->i_ino, retval, es->es_len); |
| 584 | return; |
| 585 | } |
| 586 | if (map.m_pblk != ext4_es_pblock(es)) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 587 | pr_warn("ES insert assertion failed for " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 588 | "inode: %lu m_pblk %llu != " |
| 589 | "es_pblk %llu\n", |
| 590 | inode->i_ino, map.m_pblk, |
| 591 | ext4_es_pblock(es)); |
| 592 | return; |
| 593 | } |
| 594 | } else { |
| 595 | /* |
| 596 | * We don't need to check unwritten extent because |
| 597 | * indirect-based file doesn't have it. |
| 598 | */ |
| 599 | BUG_ON(1); |
| 600 | } |
| 601 | } else if (retval == 0) { |
| 602 | if (ext4_es_is_written(es)) { |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 603 | pr_warn("ES insert assertion failed for inode: %lu " |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 604 | "We can't find the block but we want to add " |
Eric Whitney | ce140cd | 2014-02-20 16:09:12 -0500 | [diff] [blame] | 605 | "a written extent [%d/%d/%llu/%x]\n", |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 606 | inode->i_ino, es->es_lblk, es->es_len, |
| 607 | ext4_es_pblock(es), ext4_es_status(es)); |
| 608 | return; |
| 609 | } |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | static inline void ext4_es_insert_extent_check(struct inode *inode, |
| 614 | struct extent_status *es) |
| 615 | { |
| 616 | /* |
| 617 | * We don't need to worry about the race condition because |
| 618 | * caller takes i_data_sem locking. |
| 619 | */ |
| 620 | BUG_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem)); |
| 621 | if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) |
| 622 | ext4_es_insert_extent_ext_check(inode, es); |
| 623 | else |
| 624 | ext4_es_insert_extent_ind_check(inode, es); |
| 625 | } |
| 626 | #else |
| 627 | static inline void ext4_es_insert_extent_check(struct inode *inode, |
| 628 | struct extent_status *es) |
| 629 | { |
| 630 | } |
| 631 | #endif |
| 632 | |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 633 | static int __es_insert_extent(struct inode *inode, struct extent_status *newes) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 634 | { |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 635 | struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 636 | struct rb_node **p = &tree->root.rb_node; |
| 637 | struct rb_node *parent = NULL; |
| 638 | struct extent_status *es; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 639 | |
| 640 | while (*p) { |
| 641 | parent = *p; |
| 642 | es = rb_entry(parent, struct extent_status, rb_node); |
| 643 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 644 | if (newes->es_lblk < es->es_lblk) { |
| 645 | if (ext4_es_can_be_merged(newes, es)) { |
| 646 | /* |
| 647 | * Here we can modify es_lblk directly |
| 648 | * because it isn't overlapped. |
| 649 | */ |
| 650 | es->es_lblk = newes->es_lblk; |
| 651 | es->es_len += newes->es_len; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 652 | if (ext4_es_is_written(es) || |
| 653 | ext4_es_is_unwritten(es)) |
| 654 | ext4_es_store_pblock(es, |
| 655 | newes->es_pblk); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 656 | es = ext4_es_try_to_merge_left(inode, es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 657 | goto out; |
| 658 | } |
| 659 | p = &(*p)->rb_left; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 660 | } else if (newes->es_lblk > ext4_es_end(es)) { |
| 661 | if (ext4_es_can_be_merged(es, newes)) { |
| 662 | es->es_len += newes->es_len; |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 663 | es = ext4_es_try_to_merge_right(inode, es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 664 | goto out; |
| 665 | } |
| 666 | p = &(*p)->rb_right; |
| 667 | } else { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 668 | BUG_ON(1); |
| 669 | return -EINVAL; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 670 | } |
| 671 | } |
| 672 | |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 673 | es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len, |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 674 | newes->es_pblk); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 675 | if (!es) |
| 676 | return -ENOMEM; |
| 677 | rb_link_node(&es->rb_node, parent, p); |
| 678 | rb_insert_color(&es->rb_node, &tree->root); |
| 679 | |
| 680 | out: |
| 681 | tree->cache_es = es; |
| 682 | return 0; |
| 683 | } |
| 684 | |
| 685 | /* |
Theodore Ts'o | bdafe42 | 2013-07-13 00:40:31 -0400 | [diff] [blame] | 686 | * ext4_es_insert_extent() adds information to an inode's extent |
| 687 | * status tree. |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 688 | * |
| 689 | * Return 0 on success, error code on failure. |
| 690 | */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 691 | int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk, |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 692 | ext4_lblk_t len, ext4_fsblk_t pblk, |
Theodore Ts'o | 3be78c7 | 2013-08-16 21:22:41 -0400 | [diff] [blame] | 693 | unsigned int status) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 694 | { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 695 | struct extent_status newes; |
| 696 | ext4_lblk_t end = lblk + len - 1; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 697 | int err = 0; |
| 698 | |
Theodore Ts'o | 3be78c7 | 2013-08-16 21:22:41 -0400 | [diff] [blame] | 699 | es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n", |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 700 | lblk, len, pblk, status, inode->i_ino); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 701 | |
Eryu Guan | d438147 | 2013-02-22 15:27:47 -0500 | [diff] [blame] | 702 | if (!len) |
| 703 | return 0; |
| 704 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 705 | BUG_ON(end < lblk); |
| 706 | |
Lukas Czerner | d2dc317 | 2015-05-02 21:36:55 -0400 | [diff] [blame] | 707 | if ((status & EXTENT_STATUS_DELAYED) && |
| 708 | (status & EXTENT_STATUS_WRITTEN)) { |
| 709 | ext4_warning(inode->i_sb, "Inserting extent [%u/%u] as " |
| 710 | " delayed and written which can potentially " |
Jakub Wilk | 8d2ae1c | 2016-04-27 01:11:21 -0400 | [diff] [blame] | 711 | " cause data loss.", lblk, len); |
Lukas Czerner | d2dc317 | 2015-05-02 21:36:55 -0400 | [diff] [blame] | 712 | WARN_ON(1); |
| 713 | } |
| 714 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 715 | newes.es_lblk = lblk; |
| 716 | newes.es_len = len; |
Theodore Ts'o | 9a6633b | 2014-02-19 20:15:15 -0500 | [diff] [blame] | 717 | ext4_es_store_pblock_status(&newes, pblk, status); |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 718 | trace_ext4_es_insert_extent(inode, &newes); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 719 | |
Dmitry Monakhov | 921f266 | 2013-03-10 21:01:03 -0400 | [diff] [blame] | 720 | ext4_es_insert_extent_check(inode, &newes); |
| 721 | |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 722 | write_lock(&EXT4_I(inode)->i_es_lock); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 723 | err = __es_remove_extent(inode, lblk, end); |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 724 | if (err != 0) |
| 725 | goto error; |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 726 | retry: |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 727 | err = __es_insert_extent(inode, &newes); |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 728 | if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb), |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 729 | 128, EXT4_I(inode))) |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 730 | goto retry; |
| 731 | if (err == -ENOMEM && !ext4_es_is_delayed(&newes)) |
| 732 | err = 0; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 733 | |
| 734 | error: |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 735 | write_unlock(&EXT4_I(inode)->i_es_lock); |
| 736 | |
| 737 | ext4_es_print_tree(inode); |
| 738 | |
| 739 | return err; |
| 740 | } |
| 741 | |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 742 | /* |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 743 | * ext4_es_cache_extent() inserts information into the extent status |
| 744 | * tree if and only if there isn't information about the range in |
| 745 | * question already. |
| 746 | */ |
| 747 | void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, |
| 748 | ext4_lblk_t len, ext4_fsblk_t pblk, |
| 749 | unsigned int status) |
| 750 | { |
| 751 | struct extent_status *es; |
| 752 | struct extent_status newes; |
| 753 | ext4_lblk_t end = lblk + len - 1; |
| 754 | |
| 755 | newes.es_lblk = lblk; |
| 756 | newes.es_len = len; |
Theodore Ts'o | 9a6633b | 2014-02-19 20:15:15 -0500 | [diff] [blame] | 757 | ext4_es_store_pblock_status(&newes, pblk, status); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 758 | trace_ext4_es_cache_extent(inode, &newes); |
| 759 | |
| 760 | if (!len) |
| 761 | return; |
| 762 | |
| 763 | BUG_ON(end < lblk); |
| 764 | |
| 765 | write_lock(&EXT4_I(inode)->i_es_lock); |
| 766 | |
| 767 | es = __es_tree_search(&EXT4_I(inode)->i_es_tree.root, lblk); |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 768 | if (!es || es->es_lblk > end) |
| 769 | __es_insert_extent(inode, &newes); |
Theodore Ts'o | 107a7bd | 2013-08-16 21:23:41 -0400 | [diff] [blame] | 770 | write_unlock(&EXT4_I(inode)->i_es_lock); |
| 771 | } |
| 772 | |
| 773 | /* |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 774 | * ext4_es_lookup_extent() looks up an extent in extent status tree. |
| 775 | * |
| 776 | * ext4_es_lookup_extent is called by ext4_map_blocks/ext4_da_map_blocks. |
| 777 | * |
| 778 | * Return: 1 on found, 0 on not |
| 779 | */ |
| 780 | int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, |
| 781 | struct extent_status *es) |
| 782 | { |
| 783 | struct ext4_es_tree *tree; |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 784 | struct ext4_es_stats *stats; |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 785 | struct extent_status *es1 = NULL; |
| 786 | struct rb_node *node; |
| 787 | int found = 0; |
| 788 | |
| 789 | trace_ext4_es_lookup_extent_enter(inode, lblk); |
| 790 | es_debug("lookup extent in block %u\n", lblk); |
| 791 | |
| 792 | tree = &EXT4_I(inode)->i_es_tree; |
| 793 | read_lock(&EXT4_I(inode)->i_es_lock); |
| 794 | |
| 795 | /* find extent in cache firstly */ |
| 796 | es->es_lblk = es->es_len = es->es_pblk = 0; |
| 797 | if (tree->cache_es) { |
| 798 | es1 = tree->cache_es; |
| 799 | if (in_range(lblk, es1->es_lblk, es1->es_len)) { |
| 800 | es_debug("%u cached by [%u/%u)\n", |
| 801 | lblk, es1->es_lblk, es1->es_len); |
| 802 | found = 1; |
| 803 | goto out; |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | node = tree->root.rb_node; |
| 808 | while (node) { |
| 809 | es1 = rb_entry(node, struct extent_status, rb_node); |
| 810 | if (lblk < es1->es_lblk) |
| 811 | node = node->rb_left; |
| 812 | else if (lblk > ext4_es_end(es1)) |
| 813 | node = node->rb_right; |
| 814 | else { |
| 815 | found = 1; |
| 816 | break; |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | out: |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 821 | stats = &EXT4_SB(inode->i_sb)->s_es_stats; |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 822 | if (found) { |
| 823 | BUG_ON(!es1); |
| 824 | es->es_lblk = es1->es_lblk; |
| 825 | es->es_len = es1->es_len; |
| 826 | es->es_pblk = es1->es_pblk; |
Jan Kara | 87d8a74 | 2016-03-09 22:26:55 -0500 | [diff] [blame] | 827 | if (!ext4_es_is_referenced(es1)) |
| 828 | ext4_es_set_referenced(es1); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 829 | stats->es_stats_cache_hits++; |
| 830 | } else { |
| 831 | stats->es_stats_cache_misses++; |
Zheng Liu | d100eef | 2013-02-18 00:29:59 -0500 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | read_unlock(&EXT4_I(inode)->i_es_lock); |
| 835 | |
| 836 | trace_ext4_es_lookup_extent_exit(inode, es, found); |
| 837 | return found; |
| 838 | } |
| 839 | |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 840 | static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
| 841 | ext4_lblk_t end) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 842 | { |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 843 | struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 844 | struct rb_node *node; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 845 | struct extent_status *es; |
| 846 | struct extent_status orig_es; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 847 | ext4_lblk_t len1, len2; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 848 | ext4_fsblk_t block; |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 849 | int err; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 850 | |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 851 | retry: |
| 852 | err = 0; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 853 | es = __es_tree_search(&tree->root, lblk); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 854 | if (!es) |
| 855 | goto out; |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 856 | if (es->es_lblk > end) |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 857 | goto out; |
| 858 | |
| 859 | /* Simply invalidate cache_es. */ |
| 860 | tree->cache_es = NULL; |
| 861 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 862 | orig_es.es_lblk = es->es_lblk; |
| 863 | orig_es.es_len = es->es_len; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 864 | orig_es.es_pblk = es->es_pblk; |
| 865 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 866 | len1 = lblk > es->es_lblk ? lblk - es->es_lblk : 0; |
| 867 | len2 = ext4_es_end(es) > end ? ext4_es_end(es) - end : 0; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 868 | if (len1 > 0) |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 869 | es->es_len = len1; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 870 | if (len2 > 0) { |
| 871 | if (len1 > 0) { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 872 | struct extent_status newes; |
| 873 | |
| 874 | newes.es_lblk = end + 1; |
| 875 | newes.es_len = len2; |
Chen Gang | 666525d | 2014-04-07 10:18:56 -0400 | [diff] [blame] | 876 | block = 0x7FDEADBEEFULL; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 877 | if (ext4_es_is_written(&orig_es) || |
Theodore Ts'o | 9a6633b | 2014-02-19 20:15:15 -0500 | [diff] [blame] | 878 | ext4_es_is_unwritten(&orig_es)) |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 879 | block = ext4_es_pblock(&orig_es) + |
| 880 | orig_es.es_len - len2; |
Theodore Ts'o | 9a6633b | 2014-02-19 20:15:15 -0500 | [diff] [blame] | 881 | ext4_es_store_pblock_status(&newes, block, |
| 882 | ext4_es_status(&orig_es)); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 883 | err = __es_insert_extent(inode, &newes); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 884 | if (err) { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 885 | es->es_lblk = orig_es.es_lblk; |
| 886 | es->es_len = orig_es.es_len; |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 887 | if ((err == -ENOMEM) && |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 888 | __es_shrink(EXT4_SB(inode->i_sb), |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 889 | 128, EXT4_I(inode))) |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 890 | goto retry; |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 891 | goto out; |
| 892 | } |
| 893 | } else { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 894 | es->es_lblk = end + 1; |
| 895 | es->es_len = len2; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 896 | if (ext4_es_is_written(es) || |
| 897 | ext4_es_is_unwritten(es)) { |
| 898 | block = orig_es.es_pblk + orig_es.es_len - len2; |
| 899 | ext4_es_store_pblock(es, block); |
| 900 | } |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 901 | } |
| 902 | goto out; |
| 903 | } |
| 904 | |
| 905 | if (len1 > 0) { |
| 906 | node = rb_next(&es->rb_node); |
| 907 | if (node) |
| 908 | es = rb_entry(node, struct extent_status, rb_node); |
| 909 | else |
| 910 | es = NULL; |
| 911 | } |
| 912 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 913 | while (es && ext4_es_end(es) <= end) { |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 914 | node = rb_next(&es->rb_node); |
| 915 | rb_erase(&es->rb_node, &tree->root); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 916 | ext4_es_free_extent(inode, es); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 917 | if (!node) { |
| 918 | es = NULL; |
| 919 | break; |
| 920 | } |
| 921 | es = rb_entry(node, struct extent_status, rb_node); |
| 922 | } |
| 923 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 924 | if (es && es->es_lblk < end + 1) { |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 925 | ext4_lblk_t orig_len = es->es_len; |
| 926 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 927 | len1 = ext4_es_end(es) - end; |
| 928 | es->es_lblk = end + 1; |
| 929 | es->es_len = len1; |
Zheng Liu | fdc0212 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 930 | if (ext4_es_is_written(es) || ext4_es_is_unwritten(es)) { |
| 931 | block = es->es_pblk + orig_len - len1; |
| 932 | ext4_es_store_pblock(es, block); |
| 933 | } |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 934 | } |
| 935 | |
| 936 | out: |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 937 | return err; |
| 938 | } |
| 939 | |
| 940 | /* |
| 941 | * ext4_es_remove_extent() removes a space from a extent status tree. |
| 942 | * |
| 943 | * Return 0 on success, error code on failure. |
| 944 | */ |
| 945 | int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
| 946 | ext4_lblk_t len) |
| 947 | { |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 948 | ext4_lblk_t end; |
| 949 | int err = 0; |
| 950 | |
| 951 | trace_ext4_es_remove_extent(inode, lblk, len); |
| 952 | es_debug("remove [%u/%u) from extent status tree of inode %lu\n", |
| 953 | lblk, len, inode->i_ino); |
| 954 | |
Eryu Guan | d438147 | 2013-02-22 15:27:47 -0500 | [diff] [blame] | 955 | if (!len) |
| 956 | return err; |
| 957 | |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 958 | end = lblk + len - 1; |
| 959 | BUG_ON(end < lblk); |
| 960 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 961 | /* |
| 962 | * ext4_clear_inode() depends on us taking i_es_lock unconditionally |
| 963 | * so that we are sure __es_shrink() is done with the inode before it |
| 964 | * is reclaimed. |
| 965 | */ |
Zheng Liu | 06b0c88 | 2013-02-18 00:26:51 -0500 | [diff] [blame] | 966 | write_lock(&EXT4_I(inode)->i_es_lock); |
Zheng Liu | bdedbb7 | 2013-02-18 00:32:02 -0500 | [diff] [blame] | 967 | err = __es_remove_extent(inode, lblk, end); |
Zheng Liu | 654598b | 2012-11-08 21:57:20 -0500 | [diff] [blame] | 968 | write_unlock(&EXT4_I(inode)->i_es_lock); |
| 969 | ext4_es_print_tree(inode); |
| 970 | return err; |
| 971 | } |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 972 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 973 | static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan, |
| 974 | struct ext4_inode_info *locked_ei) |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 975 | { |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 976 | struct ext4_inode_info *ei; |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 977 | struct ext4_es_stats *es_stats; |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 978 | ktime_t start_time; |
| 979 | u64 scan_time; |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 980 | int nr_to_walk; |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 981 | int nr_shrunk = 0; |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 982 | int retried = 0, nr_skipped = 0; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 983 | |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 984 | es_stats = &sbi->s_es_stats; |
| 985 | start_time = ktime_get(); |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 986 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 987 | retry: |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 988 | spin_lock(&sbi->s_es_lock); |
| 989 | nr_to_walk = sbi->s_es_nr_inode; |
| 990 | while (nr_to_walk-- > 0) { |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 991 | if (list_empty(&sbi->s_es_list)) { |
| 992 | spin_unlock(&sbi->s_es_lock); |
| 993 | goto out; |
| 994 | } |
| 995 | ei = list_first_entry(&sbi->s_es_list, struct ext4_inode_info, |
| 996 | i_es_list); |
| 997 | /* Move the inode to the tail */ |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 998 | list_move_tail(&ei->i_es_list, &sbi->s_es_list); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 999 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1000 | /* |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1001 | * Normally we try hard to avoid shrinking precached inodes, |
| 1002 | * but we will as a last resort. |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1003 | */ |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1004 | if (!retried && ext4_test_inode_state(&ei->vfs_inode, |
| 1005 | EXT4_STATE_EXT_PRECACHED)) { |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1006 | nr_skipped++; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1007 | continue; |
| 1008 | } |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 1009 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1010 | if (ei == locked_ei || !write_trylock(&ei->i_es_lock)) { |
| 1011 | nr_skipped++; |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 1012 | continue; |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1013 | } |
| 1014 | /* |
| 1015 | * Now we hold i_es_lock which protects us from inode reclaim |
| 1016 | * freeing inode under us |
| 1017 | */ |
| 1018 | spin_unlock(&sbi->s_es_lock); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1019 | |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1020 | nr_shrunk += es_reclaim_extents(ei, &nr_to_scan); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1021 | write_unlock(&ei->i_es_lock); |
| 1022 | |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1023 | if (nr_to_scan <= 0) |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1024 | goto out; |
| 1025 | spin_lock(&sbi->s_es_lock); |
| 1026 | } |
| 1027 | spin_unlock(&sbi->s_es_lock); |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1028 | |
| 1029 | /* |
| 1030 | * If we skipped any inodes, and we weren't able to make any |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1031 | * forward progress, try again to scan precached inodes. |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1032 | */ |
| 1033 | if ((nr_shrunk == 0) && nr_skipped && !retried) { |
| 1034 | retried++; |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1035 | goto retry; |
| 1036 | } |
| 1037 | |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1038 | if (locked_ei && nr_shrunk == 0) |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1039 | nr_shrunk = es_reclaim_extents(locked_ei, &nr_to_scan); |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1040 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1041 | out: |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1042 | scan_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
| 1043 | if (likely(es_stats->es_stats_scan_time)) |
| 1044 | es_stats->es_stats_scan_time = (scan_time + |
| 1045 | es_stats->es_stats_scan_time*3) / 4; |
| 1046 | else |
| 1047 | es_stats->es_stats_scan_time = scan_time; |
| 1048 | if (scan_time > es_stats->es_stats_max_scan_time) |
| 1049 | es_stats->es_stats_max_scan_time = scan_time; |
| 1050 | if (likely(es_stats->es_stats_shrunk)) |
| 1051 | es_stats->es_stats_shrunk = (nr_shrunk + |
| 1052 | es_stats->es_stats_shrunk*3) / 4; |
| 1053 | else |
| 1054 | es_stats->es_stats_shrunk = nr_shrunk; |
| 1055 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1056 | trace_ext4_es_shrink(sbi->s_sb, nr_shrunk, scan_time, |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1057 | nr_skipped, retried); |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1058 | return nr_shrunk; |
| 1059 | } |
| 1060 | |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1061 | static unsigned long ext4_es_count(struct shrinker *shrink, |
| 1062 | struct shrink_control *sc) |
| 1063 | { |
| 1064 | unsigned long nr; |
| 1065 | struct ext4_sb_info *sbi; |
| 1066 | |
| 1067 | sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker); |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1068 | nr = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt); |
Zheng Liu | e963bb1 | 2014-09-01 22:22:13 -0400 | [diff] [blame] | 1069 | trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1070 | return nr; |
| 1071 | } |
| 1072 | |
| 1073 | static unsigned long ext4_es_scan(struct shrinker *shrink, |
| 1074 | struct shrink_control *sc) |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1075 | { |
| 1076 | struct ext4_sb_info *sbi = container_of(shrink, |
| 1077 | struct ext4_sb_info, s_es_shrinker); |
| 1078 | int nr_to_scan = sc->nr_to_scan; |
| 1079 | int ret, nr_shrunk; |
| 1080 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1081 | ret = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt); |
Zheng Liu | e963bb1 | 2014-09-01 22:22:13 -0400 | [diff] [blame] | 1082 | trace_ext4_es_shrink_scan_enter(sbi->s_sb, nr_to_scan, ret); |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1083 | |
| 1084 | if (!nr_to_scan) |
| 1085 | return ret; |
| 1086 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1087 | nr_shrunk = __es_shrink(sbi, nr_to_scan, NULL); |
Theodore Ts'o | e15f742 | 2013-07-15 00:12:14 -0400 | [diff] [blame] | 1088 | |
Zheng Liu | e963bb1 | 2014-09-01 22:22:13 -0400 | [diff] [blame] | 1089 | trace_ext4_es_shrink_scan_exit(sbi->s_sb, nr_shrunk, ret); |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1090 | return nr_shrunk; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1091 | } |
| 1092 | |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 1093 | int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v) |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1094 | { |
Theodore Ts'o | ebd173b | 2015-09-23 12:46:17 -0400 | [diff] [blame] | 1095 | struct ext4_sb_info *sbi = EXT4_SB((struct super_block *) seq->private); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1096 | struct ext4_es_stats *es_stats = &sbi->s_es_stats; |
| 1097 | struct ext4_inode_info *ei, *max = NULL; |
| 1098 | unsigned int inode_cnt = 0; |
| 1099 | |
| 1100 | if (v != SEQ_START_TOKEN) |
| 1101 | return 0; |
| 1102 | |
| 1103 | /* here we just find an inode that has the max nr. of objects */ |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1104 | spin_lock(&sbi->s_es_lock); |
| 1105 | list_for_each_entry(ei, &sbi->s_es_list, i_es_list) { |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1106 | inode_cnt++; |
| 1107 | if (max && max->i_es_all_nr < ei->i_es_all_nr) |
| 1108 | max = ei; |
| 1109 | else if (!max) |
| 1110 | max = ei; |
| 1111 | } |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1112 | spin_unlock(&sbi->s_es_lock); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1113 | |
| 1114 | seq_printf(seq, "stats:\n %lld objects\n %lld reclaimable objects\n", |
| 1115 | percpu_counter_sum_positive(&es_stats->es_stats_all_cnt), |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1116 | percpu_counter_sum_positive(&es_stats->es_stats_shk_cnt)); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1117 | seq_printf(seq, " %lu/%lu cache hits/misses\n", |
| 1118 | es_stats->es_stats_cache_hits, |
| 1119 | es_stats->es_stats_cache_misses); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1120 | if (inode_cnt) |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1121 | seq_printf(seq, " %d inodes on list\n", inode_cnt); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1122 | |
| 1123 | seq_printf(seq, "average:\n %llu us scan time\n", |
| 1124 | div_u64(es_stats->es_stats_scan_time, 1000)); |
| 1125 | seq_printf(seq, " %lu shrunk objects\n", es_stats->es_stats_shrunk); |
| 1126 | if (inode_cnt) |
| 1127 | seq_printf(seq, |
| 1128 | "maximum:\n %lu inode (%u objects, %u reclaimable)\n" |
| 1129 | " %llu us max scan time\n", |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1130 | max->vfs_inode.i_ino, max->i_es_all_nr, max->i_es_shk_nr, |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1131 | div_u64(es_stats->es_stats_max_scan_time, 1000)); |
| 1132 | |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1136 | int ext4_es_register_shrinker(struct ext4_sb_info *sbi) |
| 1137 | { |
| 1138 | int err; |
| 1139 | |
Jan Kara | 624d0f1 | 2014-11-25 11:53:47 -0500 | [diff] [blame] | 1140 | /* Make sure we have enough bits for physical block number */ |
| 1141 | BUILD_BUG_ON(ES_SHIFT < 48); |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1142 | INIT_LIST_HEAD(&sbi->s_es_list); |
| 1143 | sbi->s_es_nr_inode = 0; |
| 1144 | spin_lock_init(&sbi->s_es_lock); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1145 | sbi->s_es_stats.es_stats_shrunk = 0; |
| 1146 | sbi->s_es_stats.es_stats_cache_hits = 0; |
| 1147 | sbi->s_es_stats.es_stats_cache_misses = 0; |
| 1148 | sbi->s_es_stats.es_stats_scan_time = 0; |
| 1149 | sbi->s_es_stats.es_stats_max_scan_time = 0; |
Linus Torvalds | c2661b8 | 2014-10-20 09:50:11 -0700 | [diff] [blame] | 1150 | err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0, GFP_KERNEL); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1151 | if (err) |
| 1152 | return err; |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1153 | err = percpu_counter_init(&sbi->s_es_stats.es_stats_shk_cnt, 0, GFP_KERNEL); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1154 | if (err) |
| 1155 | goto err1; |
| 1156 | |
Dave Chinner | 1ab6c49 | 2013-08-28 10:18:09 +1000 | [diff] [blame] | 1157 | sbi->s_es_shrinker.scan_objects = ext4_es_scan; |
| 1158 | sbi->s_es_shrinker.count_objects = ext4_es_count; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1159 | sbi->s_es_shrinker.seeks = DEFAULT_SEEKS; |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1160 | err = register_shrinker(&sbi->s_es_shrinker); |
| 1161 | if (err) |
| 1162 | goto err2; |
| 1163 | |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1164 | return 0; |
| 1165 | |
| 1166 | err2: |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1167 | percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1168 | err1: |
| 1169 | percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt); |
| 1170 | return err; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1171 | } |
| 1172 | |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 1173 | void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi) |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1174 | { |
Zheng Liu | eb68d0e | 2014-09-01 22:26:49 -0400 | [diff] [blame] | 1175 | percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt); |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1176 | percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); |
Zheng Liu | d3922a7 | 2013-07-01 08:12:37 -0400 | [diff] [blame] | 1177 | unregister_shrinker(&sbi->s_es_shrinker); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1178 | } |
| 1179 | |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1180 | /* |
| 1181 | * Shrink extents in given inode from ei->i_es_shrink_lblk till end. Scan at |
| 1182 | * most *nr_to_scan extents, update *nr_to_scan accordingly. |
| 1183 | * |
| 1184 | * Return 0 if we hit end of tree / interval, 1 if we exhausted nr_to_scan. |
| 1185 | * Increment *nr_shrunk by the number of reclaimed extents. Also update |
| 1186 | * ei->i_es_shrink_lblk to where we should continue scanning. |
| 1187 | */ |
| 1188 | static int es_do_reclaim_extents(struct ext4_inode_info *ei, ext4_lblk_t end, |
| 1189 | int *nr_to_scan, int *nr_shrunk) |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1190 | { |
| 1191 | struct inode *inode = &ei->vfs_inode; |
| 1192 | struct ext4_es_tree *tree = &ei->i_es_tree; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1193 | struct extent_status *es; |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1194 | struct rb_node *node; |
| 1195 | |
| 1196 | es = __es_tree_search(&tree->root, ei->i_es_shrink_lblk); |
| 1197 | if (!es) |
| 1198 | goto out_wrap; |
| 1199 | node = &es->rb_node; |
| 1200 | while (*nr_to_scan > 0) { |
| 1201 | if (es->es_lblk > end) { |
| 1202 | ei->i_es_shrink_lblk = end + 1; |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | (*nr_to_scan)--; |
| 1207 | node = rb_next(&es->rb_node); |
| 1208 | /* |
| 1209 | * We can't reclaim delayed extent from status tree because |
| 1210 | * fiemap, bigallic, and seek_data/hole need to use it. |
| 1211 | */ |
Jan Kara | 2be12de | 2014-11-25 11:55:24 -0500 | [diff] [blame] | 1212 | if (ext4_es_is_delayed(es)) |
| 1213 | goto next; |
| 1214 | if (ext4_es_is_referenced(es)) { |
| 1215 | ext4_es_clear_referenced(es); |
| 1216 | goto next; |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1217 | } |
Jan Kara | 2be12de | 2014-11-25 11:55:24 -0500 | [diff] [blame] | 1218 | |
| 1219 | rb_erase(&es->rb_node, &tree->root); |
| 1220 | ext4_es_free_extent(inode, es); |
| 1221 | (*nr_shrunk)++; |
| 1222 | next: |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1223 | if (!node) |
| 1224 | goto out_wrap; |
| 1225 | es = rb_entry(node, struct extent_status, rb_node); |
| 1226 | } |
| 1227 | ei->i_es_shrink_lblk = es->es_lblk; |
| 1228 | return 1; |
| 1229 | out_wrap: |
| 1230 | ei->i_es_shrink_lblk = 0; |
| 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan) |
| 1235 | { |
| 1236 | struct inode *inode = &ei->vfs_inode; |
| 1237 | int nr_shrunk = 0; |
| 1238 | ext4_lblk_t start = ei->i_es_shrink_lblk; |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1239 | static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL, |
| 1240 | DEFAULT_RATELIMIT_BURST); |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1241 | |
Zheng Liu | edaa53c | 2014-11-25 11:45:37 -0500 | [diff] [blame] | 1242 | if (ei->i_es_shk_nr == 0) |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1243 | return 0; |
| 1244 | |
Theodore Ts'o | 7869a4a | 2013-08-16 22:05:14 -0400 | [diff] [blame] | 1245 | if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED) && |
| 1246 | __ratelimit(&_rs)) |
| 1247 | ext4_warning(inode->i_sb, "forced shrink of precached extents"); |
| 1248 | |
Jan Kara | dd47592 | 2014-11-25 11:51:23 -0500 | [diff] [blame] | 1249 | if (!es_do_reclaim_extents(ei, EXT_MAX_BLOCKS, nr_to_scan, &nr_shrunk) && |
| 1250 | start != 0) |
| 1251 | es_do_reclaim_extents(ei, start - 1, nr_to_scan, &nr_shrunk); |
| 1252 | |
| 1253 | ei->i_es_tree.cache_es = NULL; |
Zheng Liu | 74cd15c | 2013-02-18 00:32:55 -0500 | [diff] [blame] | 1254 | return nr_shrunk; |
| 1255 | } |