v4.19.13 snapshot.
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
new file mode 100644
index 0000000..c4e6fb1
--- /dev/null
+++ b/fs/ext4/extents_status.c
@@ -0,0 +1,1254 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/ext4/extents_status.c
+ *
+ * Written by Yongqiang Yang <xiaoqiangnk@gmail.com>
+ * Modified by
+ * Allison Henderson <achender@linux.vnet.ibm.com>
+ * Hugh Dickins <hughd@google.com>
+ * Zheng Liu <wenqing.lz@taobao.com>
+ *
+ * Ext4 extents status tree core functions.
+ */
+#include <linux/list_sort.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "ext4.h"
+
+#include <trace/events/ext4.h>
+
+/*
+ * According to previous discussion in Ext4 Developer Workshop, we
+ * will introduce a new structure called io tree to track all extent
+ * status in order to solve some problems that we have met
+ * (e.g. Reservation space warning), and provide extent-level locking.
+ * Delay extent tree is the first step to achieve this goal. It is
+ * original built by Yongqiang Yang. At that time it is called delay
+ * extent tree, whose goal is only track delayed extents in memory to
+ * simplify the implementation of fiemap and bigalloc, and introduce
+ * lseek SEEK_DATA/SEEK_HOLE support. That is why it is still called
+ * delay extent tree at the first commit. But for better understand
+ * what it does, it has been rename to extent status tree.
+ *
+ * Step1:
+ * Currently the first step has been done. All delayed extents are
+ * tracked in the tree. It maintains the delayed extent when a delayed
+ * allocation is issued, and the delayed extent is written out or
+ * invalidated. Therefore the implementation of fiemap and bigalloc
+ * are simplified, and SEEK_DATA/SEEK_HOLE are introduced.
+ *
+ * The following comment describes the implemenmtation of extent
+ * status tree and future works.
+ *
+ * Step2:
+ * In this step all extent status are tracked by extent status tree.
+ * Thus, we can first try to lookup a block mapping in this tree before
+ * finding it in extent tree. Hence, single extent cache can be removed
+ * because extent status tree can do a better job. Extents in status
+ * tree are loaded on-demand. Therefore, the extent status tree may not
+ * contain all of the extents in a file. Meanwhile we define a shrinker
+ * to reclaim memory from extent status tree because fragmented extent
+ * tree will make status tree cost too much memory. written/unwritten/-
+ * hole extents in the tree will be reclaimed by this shrinker when we
+ * are under high memory pressure. Delayed extents will not be
+ * reclimed because fiemap, bigalloc, and seek_data/hole need it.
+ */
+
+/*
+ * Extent status tree implementation for ext4.
+ *
+ *
+ * ==========================================================================
+ * Extent status tree tracks all extent status.
+ *
+ * 1. Why we need to implement extent status tree?
+ *
+ * Without extent status tree, ext4 identifies a delayed extent by looking
+ * up page cache, this has several deficiencies - complicated, buggy,
+ * and inefficient code.
+ *
+ * FIEMAP, SEEK_HOLE/DATA, bigalloc, and writeout all need to know if a
+ * block or a range of blocks are belonged to a delayed extent.
+ *
+ * Let us have a look at how they do without extent status tree.
+ * -- FIEMAP
+ * FIEMAP looks up page cache to identify delayed allocations from holes.
+ *
+ * -- SEEK_HOLE/DATA
+ * SEEK_HOLE/DATA has the same problem as FIEMAP.
+ *
+ * -- bigalloc
+ * bigalloc looks up page cache to figure out if a block is
+ * already under delayed allocation or not to determine whether
+ * quota reserving is needed for the cluster.
+ *
+ * -- writeout
+ * Writeout looks up whole page cache to see if a buffer is
+ * mapped, If there are not very many delayed buffers, then it is
+ * time consuming.
+ *
+ * With extent status tree implementation, FIEMAP, SEEK_HOLE/DATA,
+ * bigalloc and writeout can figure out if a block or a range of
+ * blocks is under delayed allocation(belonged to a delayed extent) or
+ * not by searching the extent tree.
+ *
+ *
+ * ==========================================================================
+ * 2. Ext4 extent status tree impelmentation
+ *
+ * -- extent
+ * A extent is a range of blocks which are contiguous logically and
+ * physically. Unlike extent in extent tree, this extent in ext4 is
+ * a in-memory struct, there is no corresponding on-disk data. There
+ * is no limit on length of extent, so an extent can contain as many
+ * blocks as they are contiguous logically and physically.
+ *
+ * -- extent status tree
+ * Every inode has an extent status tree and all allocation blocks
+ * are added to the tree with different status. The extent in the
+ * tree are ordered by logical block no.
+ *
+ * -- operations on a extent status tree
+ * There are three important operations on a delayed extent tree: find
+ * next extent, adding a extent(a range of blocks) and removing a extent.
+ *
+ * -- race on a extent status tree
+ * Extent status tree is protected by inode->i_es_lock.
+ *
+ * -- memory consumption
+ * Fragmented extent tree will make extent status tree cost too much
+ * memory. Hence, we will reclaim written/unwritten/hole extents from
+ * the tree under a heavy memory pressure.
+ *
+ *
+ * ==========================================================================
+ * 3. Performance analysis
+ *
+ * -- overhead
+ * 1. There is a cache extent for write access, so if writes are
+ * not very random, adding space operaions are in O(1) time.
+ *
+ * -- gain
+ * 2. Code is much simpler, more readable, more maintainable and
+ * more efficient.
+ *
+ *
+ * ==========================================================================
+ * 4. TODO list
+ *
+ * -- Refactor delayed space reservation
+ *
+ * -- Extent-level locking
+ */
+
+static struct kmem_cache *ext4_es_cachep;
+
+static int __es_insert_extent(struct inode *inode, struct extent_status *newes);
+static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+ ext4_lblk_t end);
+static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan);
+static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan,
+ struct ext4_inode_info *locked_ei);
+
+int __init ext4_init_es(void)
+{
+ ext4_es_cachep = kmem_cache_create("ext4_extent_status",
+ sizeof(struct extent_status),
+ 0, (SLAB_RECLAIM_ACCOUNT), NULL);
+ if (ext4_es_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void ext4_exit_es(void)
+{
+ kmem_cache_destroy(ext4_es_cachep);
+}
+
+void ext4_es_init_tree(struct ext4_es_tree *tree)
+{
+ tree->root = RB_ROOT;
+ tree->cache_es = NULL;
+}
+
+#ifdef ES_DEBUG__
+static void ext4_es_print_tree(struct inode *inode)
+{
+ struct ext4_es_tree *tree;
+ struct rb_node *node;
+
+ printk(KERN_DEBUG "status extents for inode %lu:", inode->i_ino);
+ tree = &EXT4_I(inode)->i_es_tree;
+ node = rb_first(&tree->root);
+ while (node) {
+ struct extent_status *es;
+ es = rb_entry(node, struct extent_status, rb_node);
+ printk(KERN_DEBUG " [%u/%u) %llu %x",
+ es->es_lblk, es->es_len,
+ ext4_es_pblock(es), ext4_es_status(es));
+ node = rb_next(node);
+ }
+ printk(KERN_DEBUG "\n");
+}
+#else
+#define ext4_es_print_tree(inode)
+#endif
+
+static inline ext4_lblk_t ext4_es_end(struct extent_status *es)
+{
+ BUG_ON(es->es_lblk + es->es_len < es->es_lblk);
+ return es->es_lblk + es->es_len - 1;
+}
+
+/*
+ * search through the tree for an delayed extent with a given offset. If
+ * it can't be found, try to find next extent.
+ */
+static struct extent_status *__es_tree_search(struct rb_root *root,
+ ext4_lblk_t lblk)
+{
+ struct rb_node *node = root->rb_node;
+ struct extent_status *es = NULL;
+
+ while (node) {
+ es = rb_entry(node, struct extent_status, rb_node);
+ if (lblk < es->es_lblk)
+ node = node->rb_left;
+ else if (lblk > ext4_es_end(es))
+ node = node->rb_right;
+ else
+ return es;
+ }
+
+ if (es && lblk < es->es_lblk)
+ return es;
+
+ if (es && lblk > ext4_es_end(es)) {
+ node = rb_next(&es->rb_node);
+ return node ? rb_entry(node, struct extent_status, rb_node) :
+ NULL;
+ }
+
+ return NULL;
+}
+
+/*
+ * ext4_es_find_delayed_extent_range: find the 1st delayed extent covering
+ * @es->lblk if it exists, otherwise, the next extent after @es->lblk.
+ *
+ * @inode: the inode which owns delayed extents
+ * @lblk: the offset where we start to search
+ * @end: the offset where we stop to search
+ * @es: delayed extent that we found
+ */
+void ext4_es_find_delayed_extent_range(struct inode *inode,
+ ext4_lblk_t lblk, ext4_lblk_t end,
+ struct extent_status *es)
+{
+ struct ext4_es_tree *tree = NULL;
+ struct extent_status *es1 = NULL;
+ struct rb_node *node;
+
+ BUG_ON(es == NULL);
+ BUG_ON(end < lblk);
+ trace_ext4_es_find_delayed_extent_range_enter(inode, lblk);
+
+ read_lock(&EXT4_I(inode)->i_es_lock);
+ tree = &EXT4_I(inode)->i_es_tree;
+
+ /* find extent in cache firstly */
+ es->es_lblk = es->es_len = es->es_pblk = 0;
+ if (tree->cache_es) {
+ es1 = tree->cache_es;
+ if (in_range(lblk, es1->es_lblk, es1->es_len)) {
+ es_debug("%u cached by [%u/%u) %llu %x\n",
+ lblk, es1->es_lblk, es1->es_len,
+ ext4_es_pblock(es1), ext4_es_status(es1));
+ goto out;
+ }
+ }
+
+ es1 = __es_tree_search(&tree->root, lblk);
+
+out:
+ if (es1 && !ext4_es_is_delayed(es1)) {
+ while ((node = rb_next(&es1->rb_node)) != NULL) {
+ es1 = rb_entry(node, struct extent_status, rb_node);
+ if (es1->es_lblk > end) {
+ es1 = NULL;
+ break;
+ }
+ if (ext4_es_is_delayed(es1))
+ break;
+ }
+ }
+
+ if (es1 && ext4_es_is_delayed(es1)) {
+ tree->cache_es = es1;
+ es->es_lblk = es1->es_lblk;
+ es->es_len = es1->es_len;
+ es->es_pblk = es1->es_pblk;
+ }
+
+ read_unlock(&EXT4_I(inode)->i_es_lock);
+
+ trace_ext4_es_find_delayed_extent_range_exit(inode, es);
+}
+
+static void ext4_es_list_add(struct inode *inode)
+{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+
+ if (!list_empty(&ei->i_es_list))
+ return;
+
+ spin_lock(&sbi->s_es_lock);
+ if (list_empty(&ei->i_es_list)) {
+ list_add_tail(&ei->i_es_list, &sbi->s_es_list);
+ sbi->s_es_nr_inode++;
+ }
+ spin_unlock(&sbi->s_es_lock);
+}
+
+static void ext4_es_list_del(struct inode *inode)
+{
+ struct ext4_inode_info *ei = EXT4_I(inode);
+ struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+
+ spin_lock(&sbi->s_es_lock);
+ if (!list_empty(&ei->i_es_list)) {
+ list_del_init(&ei->i_es_list);
+ sbi->s_es_nr_inode--;
+ WARN_ON_ONCE(sbi->s_es_nr_inode < 0);
+ }
+ spin_unlock(&sbi->s_es_lock);
+}
+
+static struct extent_status *
+ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
+ ext4_fsblk_t pblk)
+{
+ struct extent_status *es;
+ es = kmem_cache_alloc(ext4_es_cachep, GFP_ATOMIC);
+ if (es == NULL)
+ return NULL;
+ es->es_lblk = lblk;
+ es->es_len = len;
+ es->es_pblk = pblk;
+
+ /*
+ * We don't count delayed extent because we never try to reclaim them
+ */
+ if (!ext4_es_is_delayed(es)) {
+ if (!EXT4_I(inode)->i_es_shk_nr++)
+ ext4_es_list_add(inode);
+ percpu_counter_inc(&EXT4_SB(inode->i_sb)->
+ s_es_stats.es_stats_shk_cnt);
+ }
+
+ EXT4_I(inode)->i_es_all_nr++;
+ percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt);
+
+ return es;
+}
+
+static void ext4_es_free_extent(struct inode *inode, struct extent_status *es)
+{
+ EXT4_I(inode)->i_es_all_nr--;
+ percpu_counter_dec(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt);
+
+ /* Decrease the shrink counter when this es is not delayed */
+ if (!ext4_es_is_delayed(es)) {
+ BUG_ON(EXT4_I(inode)->i_es_shk_nr == 0);
+ if (!--EXT4_I(inode)->i_es_shk_nr)
+ ext4_es_list_del(inode);
+ percpu_counter_dec(&EXT4_SB(inode->i_sb)->
+ s_es_stats.es_stats_shk_cnt);
+ }
+
+ kmem_cache_free(ext4_es_cachep, es);
+}
+
+/*
+ * Check whether or not two extents can be merged
+ * Condition:
+ * - logical block number is contiguous
+ * - physical block number is contiguous
+ * - status is equal
+ */
+static int ext4_es_can_be_merged(struct extent_status *es1,
+ struct extent_status *es2)
+{
+ if (ext4_es_type(es1) != ext4_es_type(es2))
+ return 0;
+
+ if (((__u64) es1->es_len) + es2->es_len > EXT_MAX_BLOCKS) {
+ pr_warn("ES assertion failed when merging extents. "
+ "The sum of lengths of es1 (%d) and es2 (%d) "
+ "is bigger than allowed file size (%d)\n",
+ es1->es_len, es2->es_len, EXT_MAX_BLOCKS);
+ WARN_ON(1);
+ return 0;
+ }
+
+ if (((__u64) es1->es_lblk) + es1->es_len != es2->es_lblk)
+ return 0;
+
+ if ((ext4_es_is_written(es1) || ext4_es_is_unwritten(es1)) &&
+ (ext4_es_pblock(es1) + es1->es_len == ext4_es_pblock(es2)))
+ return 1;
+
+ if (ext4_es_is_hole(es1))
+ return 1;
+
+ /* we need to check delayed extent is without unwritten status */
+ if (ext4_es_is_delayed(es1) && !ext4_es_is_unwritten(es1))
+ return 1;
+
+ return 0;
+}
+
+static struct extent_status *
+ext4_es_try_to_merge_left(struct inode *inode, struct extent_status *es)
+{
+ struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
+ struct extent_status *es1;
+ struct rb_node *node;
+
+ node = rb_prev(&es->rb_node);
+ if (!node)
+ return es;
+
+ es1 = rb_entry(node, struct extent_status, rb_node);
+ if (ext4_es_can_be_merged(es1, es)) {
+ es1->es_len += es->es_len;
+ if (ext4_es_is_referenced(es))
+ ext4_es_set_referenced(es1);
+ rb_erase(&es->rb_node, &tree->root);
+ ext4_es_free_extent(inode, es);
+ es = es1;
+ }
+
+ return es;
+}
+
+static struct extent_status *
+ext4_es_try_to_merge_right(struct inode *inode, struct extent_status *es)
+{
+ struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
+ struct extent_status *es1;
+ struct rb_node *node;
+
+ node = rb_next(&es->rb_node);
+ if (!node)
+ return es;
+
+ es1 = rb_entry(node, struct extent_status, rb_node);
+ if (ext4_es_can_be_merged(es, es1)) {
+ es->es_len += es1->es_len;
+ if (ext4_es_is_referenced(es1))
+ ext4_es_set_referenced(es);
+ rb_erase(node, &tree->root);
+ ext4_es_free_extent(inode, es1);
+ }
+
+ return es;
+}
+
+#ifdef ES_AGGRESSIVE_TEST
+#include "ext4_extents.h" /* Needed when ES_AGGRESSIVE_TEST is defined */
+
+static void ext4_es_insert_extent_ext_check(struct inode *inode,
+ struct extent_status *es)
+{
+ struct ext4_ext_path *path = NULL;
+ struct ext4_extent *ex;
+ ext4_lblk_t ee_block;
+ ext4_fsblk_t ee_start;
+ unsigned short ee_len;
+ int depth, ee_status, es_status;
+
+ path = ext4_find_extent(inode, es->es_lblk, NULL, EXT4_EX_NOCACHE);
+ if (IS_ERR(path))
+ return;
+
+ depth = ext_depth(inode);
+ ex = path[depth].p_ext;
+
+ if (ex) {
+
+ ee_block = le32_to_cpu(ex->ee_block);
+ ee_start = ext4_ext_pblock(ex);
+ ee_len = ext4_ext_get_actual_len(ex);
+
+ ee_status = ext4_ext_is_unwritten(ex) ? 1 : 0;
+ es_status = ext4_es_is_unwritten(es) ? 1 : 0;
+
+ /*
+ * Make sure ex and es are not overlap when we try to insert
+ * a delayed/hole extent.
+ */
+ if (!ext4_es_is_written(es) && !ext4_es_is_unwritten(es)) {
+ if (in_range(es->es_lblk, ee_block, ee_len)) {
+ pr_warn("ES insert assertion failed for "
+ "inode: %lu we can find an extent "
+ "at block [%d/%d/%llu/%c], but we "
+ "want to add a delayed/hole extent "
+ "[%d/%d/%llu/%x]\n",
+ inode->i_ino, ee_block, ee_len,
+ ee_start, ee_status ? 'u' : 'w',
+ es->es_lblk, es->es_len,
+ ext4_es_pblock(es), ext4_es_status(es));
+ }
+ goto out;
+ }
+
+ /*
+ * We don't check ee_block == es->es_lblk, etc. because es
+ * might be a part of whole extent, vice versa.
+ */
+ if (es->es_lblk < ee_block ||
+ ext4_es_pblock(es) != ee_start + es->es_lblk - ee_block) {
+ pr_warn("ES insert assertion failed for inode: %lu "
+ "ex_status [%d/%d/%llu/%c] != "
+ "es_status [%d/%d/%llu/%c]\n", inode->i_ino,
+ ee_block, ee_len, ee_start,
+ ee_status ? 'u' : 'w', es->es_lblk, es->es_len,
+ ext4_es_pblock(es), es_status ? 'u' : 'w');
+ goto out;
+ }
+
+ if (ee_status ^ es_status) {
+ pr_warn("ES insert assertion failed for inode: %lu "
+ "ex_status [%d/%d/%llu/%c] != "
+ "es_status [%d/%d/%llu/%c]\n", inode->i_ino,
+ ee_block, ee_len, ee_start,
+ ee_status ? 'u' : 'w', es->es_lblk, es->es_len,
+ ext4_es_pblock(es), es_status ? 'u' : 'w');
+ }
+ } else {
+ /*
+ * We can't find an extent on disk. So we need to make sure
+ * that we don't want to add an written/unwritten extent.
+ */
+ if (!ext4_es_is_delayed(es) && !ext4_es_is_hole(es)) {
+ pr_warn("ES insert assertion failed for inode: %lu "
+ "can't find an extent at block %d but we want "
+ "to add a written/unwritten extent "
+ "[%d/%d/%llu/%x]\n", inode->i_ino,
+ es->es_lblk, es->es_lblk, es->es_len,
+ ext4_es_pblock(es), ext4_es_status(es));
+ }
+ }
+out:
+ ext4_ext_drop_refs(path);
+ kfree(path);
+}
+
+static void ext4_es_insert_extent_ind_check(struct inode *inode,
+ struct extent_status *es)
+{
+ struct ext4_map_blocks map;
+ int retval;
+
+ /*
+ * Here we call ext4_ind_map_blocks to lookup a block mapping because
+ * 'Indirect' structure is defined in indirect.c. So we couldn't
+ * access direct/indirect tree from outside. It is too dirty to define
+ * this function in indirect.c file.
+ */
+
+ map.m_lblk = es->es_lblk;
+ map.m_len = es->es_len;
+
+ retval = ext4_ind_map_blocks(NULL, inode, &map, 0);
+ if (retval > 0) {
+ if (ext4_es_is_delayed(es) || ext4_es_is_hole(es)) {
+ /*
+ * We want to add a delayed/hole extent but this
+ * block has been allocated.
+ */
+ pr_warn("ES insert assertion failed for inode: %lu "
+ "We can find blocks but we want to add a "
+ "delayed/hole extent [%d/%d/%llu/%x]\n",
+ inode->i_ino, es->es_lblk, es->es_len,
+ ext4_es_pblock(es), ext4_es_status(es));
+ return;
+ } else if (ext4_es_is_written(es)) {
+ if (retval != es->es_len) {
+ pr_warn("ES insert assertion failed for "
+ "inode: %lu retval %d != es_len %d\n",
+ inode->i_ino, retval, es->es_len);
+ return;
+ }
+ if (map.m_pblk != ext4_es_pblock(es)) {
+ pr_warn("ES insert assertion failed for "
+ "inode: %lu m_pblk %llu != "
+ "es_pblk %llu\n",
+ inode->i_ino, map.m_pblk,
+ ext4_es_pblock(es));
+ return;
+ }
+ } else {
+ /*
+ * We don't need to check unwritten extent because
+ * indirect-based file doesn't have it.
+ */
+ BUG_ON(1);
+ }
+ } else if (retval == 0) {
+ if (ext4_es_is_written(es)) {
+ pr_warn("ES insert assertion failed for inode: %lu "
+ "We can't find the block but we want to add "
+ "a written extent [%d/%d/%llu/%x]\n",
+ inode->i_ino, es->es_lblk, es->es_len,
+ ext4_es_pblock(es), ext4_es_status(es));
+ return;
+ }
+ }
+}
+
+static inline void ext4_es_insert_extent_check(struct inode *inode,
+ struct extent_status *es)
+{
+ /*
+ * We don't need to worry about the race condition because
+ * caller takes i_data_sem locking.
+ */
+ BUG_ON(!rwsem_is_locked(&EXT4_I(inode)->i_data_sem));
+ if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ ext4_es_insert_extent_ext_check(inode, es);
+ else
+ ext4_es_insert_extent_ind_check(inode, es);
+}
+#else
+static inline void ext4_es_insert_extent_check(struct inode *inode,
+ struct extent_status *es)
+{
+}
+#endif
+
+static int __es_insert_extent(struct inode *inode, struct extent_status *newes)
+{
+ struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
+ struct rb_node **p = &tree->root.rb_node;
+ struct rb_node *parent = NULL;
+ struct extent_status *es;
+
+ while (*p) {
+ parent = *p;
+ es = rb_entry(parent, struct extent_status, rb_node);
+
+ if (newes->es_lblk < es->es_lblk) {
+ if (ext4_es_can_be_merged(newes, es)) {
+ /*
+ * Here we can modify es_lblk directly
+ * because it isn't overlapped.
+ */
+ es->es_lblk = newes->es_lblk;
+ es->es_len += newes->es_len;
+ if (ext4_es_is_written(es) ||
+ ext4_es_is_unwritten(es))
+ ext4_es_store_pblock(es,
+ newes->es_pblk);
+ es = ext4_es_try_to_merge_left(inode, es);
+ goto out;
+ }
+ p = &(*p)->rb_left;
+ } else if (newes->es_lblk > ext4_es_end(es)) {
+ if (ext4_es_can_be_merged(es, newes)) {
+ es->es_len += newes->es_len;
+ es = ext4_es_try_to_merge_right(inode, es);
+ goto out;
+ }
+ p = &(*p)->rb_right;
+ } else {
+ BUG_ON(1);
+ return -EINVAL;
+ }
+ }
+
+ es = ext4_es_alloc_extent(inode, newes->es_lblk, newes->es_len,
+ newes->es_pblk);
+ if (!es)
+ return -ENOMEM;
+ rb_link_node(&es->rb_node, parent, p);
+ rb_insert_color(&es->rb_node, &tree->root);
+
+out:
+ tree->cache_es = es;
+ return 0;
+}
+
+/*
+ * ext4_es_insert_extent() adds information to an inode's extent
+ * status tree.
+ *
+ * Return 0 on success, error code on failure.
+ */
+int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
+ ext4_lblk_t len, ext4_fsblk_t pblk,
+ unsigned int status)
+{
+ struct extent_status newes;
+ ext4_lblk_t end = lblk + len - 1;
+ int err = 0;
+
+ es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n",
+ lblk, len, pblk, status, inode->i_ino);
+
+ if (!len)
+ return 0;
+
+ BUG_ON(end < lblk);
+
+ if ((status & EXTENT_STATUS_DELAYED) &&
+ (status & EXTENT_STATUS_WRITTEN)) {
+ ext4_warning(inode->i_sb, "Inserting extent [%u/%u] as "
+ " delayed and written which can potentially "
+ " cause data loss.", lblk, len);
+ WARN_ON(1);
+ }
+
+ newes.es_lblk = lblk;
+ newes.es_len = len;
+ ext4_es_store_pblock_status(&newes, pblk, status);
+ trace_ext4_es_insert_extent(inode, &newes);
+
+ ext4_es_insert_extent_check(inode, &newes);
+
+ write_lock(&EXT4_I(inode)->i_es_lock);
+ err = __es_remove_extent(inode, lblk, end);
+ if (err != 0)
+ goto error;
+retry:
+ err = __es_insert_extent(inode, &newes);
+ if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb),
+ 128, EXT4_I(inode)))
+ goto retry;
+ if (err == -ENOMEM && !ext4_es_is_delayed(&newes))
+ err = 0;
+
+error:
+ write_unlock(&EXT4_I(inode)->i_es_lock);
+
+ ext4_es_print_tree(inode);
+
+ return err;
+}
+
+/*
+ * ext4_es_cache_extent() inserts information into the extent status
+ * tree if and only if there isn't information about the range in
+ * question already.
+ */
+void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk,
+ ext4_lblk_t len, ext4_fsblk_t pblk,
+ unsigned int status)
+{
+ struct extent_status *es;
+ struct extent_status newes;
+ ext4_lblk_t end = lblk + len - 1;
+
+ newes.es_lblk = lblk;
+ newes.es_len = len;
+ ext4_es_store_pblock_status(&newes, pblk, status);
+ trace_ext4_es_cache_extent(inode, &newes);
+
+ if (!len)
+ return;
+
+ BUG_ON(end < lblk);
+
+ write_lock(&EXT4_I(inode)->i_es_lock);
+
+ es = __es_tree_search(&EXT4_I(inode)->i_es_tree.root, lblk);
+ if (!es || es->es_lblk > end)
+ __es_insert_extent(inode, &newes);
+ write_unlock(&EXT4_I(inode)->i_es_lock);
+}
+
+/*
+ * ext4_es_lookup_extent() looks up an extent in extent status tree.
+ *
+ * ext4_es_lookup_extent is called by ext4_map_blocks/ext4_da_map_blocks.
+ *
+ * Return: 1 on found, 0 on not
+ */
+int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
+ struct extent_status *es)
+{
+ struct ext4_es_tree *tree;
+ struct ext4_es_stats *stats;
+ struct extent_status *es1 = NULL;
+ struct rb_node *node;
+ int found = 0;
+
+ trace_ext4_es_lookup_extent_enter(inode, lblk);
+ es_debug("lookup extent in block %u\n", lblk);
+
+ tree = &EXT4_I(inode)->i_es_tree;
+ read_lock(&EXT4_I(inode)->i_es_lock);
+
+ /* find extent in cache firstly */
+ es->es_lblk = es->es_len = es->es_pblk = 0;
+ if (tree->cache_es) {
+ es1 = tree->cache_es;
+ if (in_range(lblk, es1->es_lblk, es1->es_len)) {
+ es_debug("%u cached by [%u/%u)\n",
+ lblk, es1->es_lblk, es1->es_len);
+ found = 1;
+ goto out;
+ }
+ }
+
+ node = tree->root.rb_node;
+ while (node) {
+ es1 = rb_entry(node, struct extent_status, rb_node);
+ if (lblk < es1->es_lblk)
+ node = node->rb_left;
+ else if (lblk > ext4_es_end(es1))
+ node = node->rb_right;
+ else {
+ found = 1;
+ break;
+ }
+ }
+
+out:
+ stats = &EXT4_SB(inode->i_sb)->s_es_stats;
+ if (found) {
+ BUG_ON(!es1);
+ es->es_lblk = es1->es_lblk;
+ es->es_len = es1->es_len;
+ es->es_pblk = es1->es_pblk;
+ if (!ext4_es_is_referenced(es1))
+ ext4_es_set_referenced(es1);
+ stats->es_stats_cache_hits++;
+ } else {
+ stats->es_stats_cache_misses++;
+ }
+
+ read_unlock(&EXT4_I(inode)->i_es_lock);
+
+ trace_ext4_es_lookup_extent_exit(inode, es, found);
+ return found;
+}
+
+static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+ ext4_lblk_t end)
+{
+ struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree;
+ struct rb_node *node;
+ struct extent_status *es;
+ struct extent_status orig_es;
+ ext4_lblk_t len1, len2;
+ ext4_fsblk_t block;
+ int err;
+
+retry:
+ err = 0;
+ es = __es_tree_search(&tree->root, lblk);
+ if (!es)
+ goto out;
+ if (es->es_lblk > end)
+ goto out;
+
+ /* Simply invalidate cache_es. */
+ tree->cache_es = NULL;
+
+ orig_es.es_lblk = es->es_lblk;
+ orig_es.es_len = es->es_len;
+ orig_es.es_pblk = es->es_pblk;
+
+ len1 = lblk > es->es_lblk ? lblk - es->es_lblk : 0;
+ len2 = ext4_es_end(es) > end ? ext4_es_end(es) - end : 0;
+ if (len1 > 0)
+ es->es_len = len1;
+ if (len2 > 0) {
+ if (len1 > 0) {
+ struct extent_status newes;
+
+ newes.es_lblk = end + 1;
+ newes.es_len = len2;
+ block = 0x7FDEADBEEFULL;
+ if (ext4_es_is_written(&orig_es) ||
+ ext4_es_is_unwritten(&orig_es))
+ block = ext4_es_pblock(&orig_es) +
+ orig_es.es_len - len2;
+ ext4_es_store_pblock_status(&newes, block,
+ ext4_es_status(&orig_es));
+ err = __es_insert_extent(inode, &newes);
+ if (err) {
+ es->es_lblk = orig_es.es_lblk;
+ es->es_len = orig_es.es_len;
+ if ((err == -ENOMEM) &&
+ __es_shrink(EXT4_SB(inode->i_sb),
+ 128, EXT4_I(inode)))
+ goto retry;
+ goto out;
+ }
+ } else {
+ es->es_lblk = end + 1;
+ es->es_len = len2;
+ if (ext4_es_is_written(es) ||
+ ext4_es_is_unwritten(es)) {
+ block = orig_es.es_pblk + orig_es.es_len - len2;
+ ext4_es_store_pblock(es, block);
+ }
+ }
+ goto out;
+ }
+
+ if (len1 > 0) {
+ node = rb_next(&es->rb_node);
+ if (node)
+ es = rb_entry(node, struct extent_status, rb_node);
+ else
+ es = NULL;
+ }
+
+ while (es && ext4_es_end(es) <= end) {
+ node = rb_next(&es->rb_node);
+ rb_erase(&es->rb_node, &tree->root);
+ ext4_es_free_extent(inode, es);
+ if (!node) {
+ es = NULL;
+ break;
+ }
+ es = rb_entry(node, struct extent_status, rb_node);
+ }
+
+ if (es && es->es_lblk < end + 1) {
+ ext4_lblk_t orig_len = es->es_len;
+
+ len1 = ext4_es_end(es) - end;
+ es->es_lblk = end + 1;
+ es->es_len = len1;
+ if (ext4_es_is_written(es) || ext4_es_is_unwritten(es)) {
+ block = es->es_pblk + orig_len - len1;
+ ext4_es_store_pblock(es, block);
+ }
+ }
+
+out:
+ return err;
+}
+
+/*
+ * ext4_es_remove_extent() removes a space from a extent status tree.
+ *
+ * Return 0 on success, error code on failure.
+ */
+int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
+ ext4_lblk_t len)
+{
+ ext4_lblk_t end;
+ int err = 0;
+
+ trace_ext4_es_remove_extent(inode, lblk, len);
+ es_debug("remove [%u/%u) from extent status tree of inode %lu\n",
+ lblk, len, inode->i_ino);
+
+ if (!len)
+ return err;
+
+ end = lblk + len - 1;
+ BUG_ON(end < lblk);
+
+ /*
+ * ext4_clear_inode() depends on us taking i_es_lock unconditionally
+ * so that we are sure __es_shrink() is done with the inode before it
+ * is reclaimed.
+ */
+ write_lock(&EXT4_I(inode)->i_es_lock);
+ err = __es_remove_extent(inode, lblk, end);
+ write_unlock(&EXT4_I(inode)->i_es_lock);
+ ext4_es_print_tree(inode);
+ return err;
+}
+
+static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan,
+ struct ext4_inode_info *locked_ei)
+{
+ struct ext4_inode_info *ei;
+ struct ext4_es_stats *es_stats;
+ ktime_t start_time;
+ u64 scan_time;
+ int nr_to_walk;
+ int nr_shrunk = 0;
+ int retried = 0, nr_skipped = 0;
+
+ es_stats = &sbi->s_es_stats;
+ start_time = ktime_get();
+
+retry:
+ spin_lock(&sbi->s_es_lock);
+ nr_to_walk = sbi->s_es_nr_inode;
+ while (nr_to_walk-- > 0) {
+ if (list_empty(&sbi->s_es_list)) {
+ spin_unlock(&sbi->s_es_lock);
+ goto out;
+ }
+ ei = list_first_entry(&sbi->s_es_list, struct ext4_inode_info,
+ i_es_list);
+ /* Move the inode to the tail */
+ list_move_tail(&ei->i_es_list, &sbi->s_es_list);
+
+ /*
+ * Normally we try hard to avoid shrinking precached inodes,
+ * but we will as a last resort.
+ */
+ if (!retried && ext4_test_inode_state(&ei->vfs_inode,
+ EXT4_STATE_EXT_PRECACHED)) {
+ nr_skipped++;
+ continue;
+ }
+
+ if (ei == locked_ei || !write_trylock(&ei->i_es_lock)) {
+ nr_skipped++;
+ continue;
+ }
+ /*
+ * Now we hold i_es_lock which protects us from inode reclaim
+ * freeing inode under us
+ */
+ spin_unlock(&sbi->s_es_lock);
+
+ nr_shrunk += es_reclaim_extents(ei, &nr_to_scan);
+ write_unlock(&ei->i_es_lock);
+
+ if (nr_to_scan <= 0)
+ goto out;
+ spin_lock(&sbi->s_es_lock);
+ }
+ spin_unlock(&sbi->s_es_lock);
+
+ /*
+ * If we skipped any inodes, and we weren't able to make any
+ * forward progress, try again to scan precached inodes.
+ */
+ if ((nr_shrunk == 0) && nr_skipped && !retried) {
+ retried++;
+ goto retry;
+ }
+
+ if (locked_ei && nr_shrunk == 0)
+ nr_shrunk = es_reclaim_extents(locked_ei, &nr_to_scan);
+
+out:
+ scan_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
+ if (likely(es_stats->es_stats_scan_time))
+ es_stats->es_stats_scan_time = (scan_time +
+ es_stats->es_stats_scan_time*3) / 4;
+ else
+ es_stats->es_stats_scan_time = scan_time;
+ if (scan_time > es_stats->es_stats_max_scan_time)
+ es_stats->es_stats_max_scan_time = scan_time;
+ if (likely(es_stats->es_stats_shrunk))
+ es_stats->es_stats_shrunk = (nr_shrunk +
+ es_stats->es_stats_shrunk*3) / 4;
+ else
+ es_stats->es_stats_shrunk = nr_shrunk;
+
+ trace_ext4_es_shrink(sbi->s_sb, nr_shrunk, scan_time,
+ nr_skipped, retried);
+ return nr_shrunk;
+}
+
+static unsigned long ext4_es_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ unsigned long nr;
+ struct ext4_sb_info *sbi;
+
+ sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker);
+ nr = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt);
+ trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr);
+ return nr;
+}
+
+static unsigned long ext4_es_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ struct ext4_sb_info *sbi = container_of(shrink,
+ struct ext4_sb_info, s_es_shrinker);
+ int nr_to_scan = sc->nr_to_scan;
+ int ret, nr_shrunk;
+
+ ret = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt);
+ trace_ext4_es_shrink_scan_enter(sbi->s_sb, nr_to_scan, ret);
+
+ if (!nr_to_scan)
+ return ret;
+
+ nr_shrunk = __es_shrink(sbi, nr_to_scan, NULL);
+
+ trace_ext4_es_shrink_scan_exit(sbi->s_sb, nr_shrunk, ret);
+ return nr_shrunk;
+}
+
+int ext4_seq_es_shrinker_info_show(struct seq_file *seq, void *v)
+{
+ struct ext4_sb_info *sbi = EXT4_SB((struct super_block *) seq->private);
+ struct ext4_es_stats *es_stats = &sbi->s_es_stats;
+ struct ext4_inode_info *ei, *max = NULL;
+ unsigned int inode_cnt = 0;
+
+ if (v != SEQ_START_TOKEN)
+ return 0;
+
+ /* here we just find an inode that has the max nr. of objects */
+ spin_lock(&sbi->s_es_lock);
+ list_for_each_entry(ei, &sbi->s_es_list, i_es_list) {
+ inode_cnt++;
+ if (max && max->i_es_all_nr < ei->i_es_all_nr)
+ max = ei;
+ else if (!max)
+ max = ei;
+ }
+ spin_unlock(&sbi->s_es_lock);
+
+ seq_printf(seq, "stats:\n %lld objects\n %lld reclaimable objects\n",
+ percpu_counter_sum_positive(&es_stats->es_stats_all_cnt),
+ percpu_counter_sum_positive(&es_stats->es_stats_shk_cnt));
+ seq_printf(seq, " %lu/%lu cache hits/misses\n",
+ es_stats->es_stats_cache_hits,
+ es_stats->es_stats_cache_misses);
+ if (inode_cnt)
+ seq_printf(seq, " %d inodes on list\n", inode_cnt);
+
+ seq_printf(seq, "average:\n %llu us scan time\n",
+ div_u64(es_stats->es_stats_scan_time, 1000));
+ seq_printf(seq, " %lu shrunk objects\n", es_stats->es_stats_shrunk);
+ if (inode_cnt)
+ seq_printf(seq,
+ "maximum:\n %lu inode (%u objects, %u reclaimable)\n"
+ " %llu us max scan time\n",
+ max->vfs_inode.i_ino, max->i_es_all_nr, max->i_es_shk_nr,
+ div_u64(es_stats->es_stats_max_scan_time, 1000));
+
+ return 0;
+}
+
+int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
+{
+ int err;
+
+ /* Make sure we have enough bits for physical block number */
+ BUILD_BUG_ON(ES_SHIFT < 48);
+ INIT_LIST_HEAD(&sbi->s_es_list);
+ sbi->s_es_nr_inode = 0;
+ spin_lock_init(&sbi->s_es_lock);
+ sbi->s_es_stats.es_stats_shrunk = 0;
+ sbi->s_es_stats.es_stats_cache_hits = 0;
+ sbi->s_es_stats.es_stats_cache_misses = 0;
+ sbi->s_es_stats.es_stats_scan_time = 0;
+ sbi->s_es_stats.es_stats_max_scan_time = 0;
+ err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0, GFP_KERNEL);
+ if (err)
+ return err;
+ err = percpu_counter_init(&sbi->s_es_stats.es_stats_shk_cnt, 0, GFP_KERNEL);
+ if (err)
+ goto err1;
+
+ sbi->s_es_shrinker.scan_objects = ext4_es_scan;
+ sbi->s_es_shrinker.count_objects = ext4_es_count;
+ sbi->s_es_shrinker.seeks = DEFAULT_SEEKS;
+ err = register_shrinker(&sbi->s_es_shrinker);
+ if (err)
+ goto err2;
+
+ return 0;
+
+err2:
+ percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt);
+err1:
+ percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
+ return err;
+}
+
+void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi)
+{
+ percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
+ percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt);
+ unregister_shrinker(&sbi->s_es_shrinker);
+}
+
+/*
+ * Shrink extents in given inode from ei->i_es_shrink_lblk till end. Scan at
+ * most *nr_to_scan extents, update *nr_to_scan accordingly.
+ *
+ * Return 0 if we hit end of tree / interval, 1 if we exhausted nr_to_scan.
+ * Increment *nr_shrunk by the number of reclaimed extents. Also update
+ * ei->i_es_shrink_lblk to where we should continue scanning.
+ */
+static int es_do_reclaim_extents(struct ext4_inode_info *ei, ext4_lblk_t end,
+ int *nr_to_scan, int *nr_shrunk)
+{
+ struct inode *inode = &ei->vfs_inode;
+ struct ext4_es_tree *tree = &ei->i_es_tree;
+ struct extent_status *es;
+ struct rb_node *node;
+
+ es = __es_tree_search(&tree->root, ei->i_es_shrink_lblk);
+ if (!es)
+ goto out_wrap;
+ node = &es->rb_node;
+ while (*nr_to_scan > 0) {
+ if (es->es_lblk > end) {
+ ei->i_es_shrink_lblk = end + 1;
+ return 0;
+ }
+
+ (*nr_to_scan)--;
+ node = rb_next(&es->rb_node);
+ /*
+ * We can't reclaim delayed extent from status tree because
+ * fiemap, bigallic, and seek_data/hole need to use it.
+ */
+ if (ext4_es_is_delayed(es))
+ goto next;
+ if (ext4_es_is_referenced(es)) {
+ ext4_es_clear_referenced(es);
+ goto next;
+ }
+
+ rb_erase(&es->rb_node, &tree->root);
+ ext4_es_free_extent(inode, es);
+ (*nr_shrunk)++;
+next:
+ if (!node)
+ goto out_wrap;
+ es = rb_entry(node, struct extent_status, rb_node);
+ }
+ ei->i_es_shrink_lblk = es->es_lblk;
+ return 1;
+out_wrap:
+ ei->i_es_shrink_lblk = 0;
+ return 0;
+}
+
+static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan)
+{
+ struct inode *inode = &ei->vfs_inode;
+ int nr_shrunk = 0;
+ ext4_lblk_t start = ei->i_es_shrink_lblk;
+ static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
+
+ if (ei->i_es_shk_nr == 0)
+ return 0;
+
+ if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED) &&
+ __ratelimit(&_rs))
+ ext4_warning(inode->i_sb, "forced shrink of precached extents");
+
+ if (!es_do_reclaim_extents(ei, EXT_MAX_BLOCKS, nr_to_scan, &nr_shrunk) &&
+ start != 0)
+ es_do_reclaim_extents(ei, start - 1, nr_to_scan, &nr_shrunk);
+
+ ei->i_es_tree.cache_es = NULL;
+ return nr_shrunk;
+}