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2194 lines
60 KiB
2194 lines
60 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* fs/ext4/extents_status.c |
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* |
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* Written by Yongqiang Yang <[email protected]> |
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* Modified by |
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* Allison Henderson <[email protected]> |
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* Hugh Dickins <[email protected]> |
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* Zheng Liu <[email protected]> |
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* |
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* Ext4 extents status tree core functions. |
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*/ |
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#include <linux/list_sort.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include "ext4.h" |
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|
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#include <trace/events/ext4.h> |
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|
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/* |
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* According to previous discussion in Ext4 Developer Workshop, we |
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* will introduce a new structure called io tree to track all extent |
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* status in order to solve some problems that we have met |
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* (e.g. Reservation space warning), and provide extent-level locking. |
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* Delay extent tree is the first step to achieve this goal. It is |
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* original built by Yongqiang Yang. At that time it is called delay |
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* extent tree, whose goal is only track delayed extents in memory to |
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* simplify the implementation of fiemap and bigalloc, and introduce |
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* lseek SEEK_DATA/SEEK_HOLE support. That is why it is still called |
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* delay extent tree at the first commit. But for better understand |
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* what it does, it has been rename to extent status tree. |
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* |
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* Step1: |
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* Currently the first step has been done. All delayed extents are |
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* tracked in the tree. It maintains the delayed extent when a delayed |
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* allocation is issued, and the delayed extent is written out or |
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* invalidated. Therefore the implementation of fiemap and bigalloc |
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* are simplified, and SEEK_DATA/SEEK_HOLE are introduced. |
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* |
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* The following comment describes the implemenmtation of extent |
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* status tree and future works. |
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* |
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* Step2: |
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* In this step all extent status are tracked by extent status tree. |
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* Thus, we can first try to lookup a block mapping in this tree before |
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* finding it in extent tree. Hence, single extent cache can be removed |
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* because extent status tree can do a better job. Extents in status |
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* tree are loaded on-demand. Therefore, the extent status tree may not |
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* contain all of the extents in a file. Meanwhile we define a shrinker |
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* to reclaim memory from extent status tree because fragmented extent |
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* tree will make status tree cost too much memory. written/unwritten/- |
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* hole extents in the tree will be reclaimed by this shrinker when we |
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* are under high memory pressure. Delayed extents will not be |
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* reclimed because fiemap, bigalloc, and seek_data/hole need it. |
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*/ |
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|
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/* |
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* Extent status tree implementation for ext4. |
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* |
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* |
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* ========================================================================== |
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* Extent status tree tracks all extent status. |
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* |
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* 1. Why we need to implement extent status tree? |
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* |
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* Without extent status tree, ext4 identifies a delayed extent by looking |
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* up page cache, this has several deficiencies - complicated, buggy, |
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* and inefficient code. |
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* |
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* FIEMAP, SEEK_HOLE/DATA, bigalloc, and writeout all need to know if a |
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* block or a range of blocks are belonged to a delayed extent. |
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* |
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* Let us have a look at how they do without extent status tree. |
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* -- FIEMAP |
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* FIEMAP looks up page cache to identify delayed allocations from holes. |
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* |
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* -- SEEK_HOLE/DATA |
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* SEEK_HOLE/DATA has the same problem as FIEMAP. |
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* |
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* -- bigalloc |
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* bigalloc looks up page cache to figure out if a block is |
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* already under delayed allocation or not to determine whether |
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* quota reserving is needed for the cluster. |
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* |
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* -- writeout |
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* Writeout looks up whole page cache to see if a buffer is |
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* mapped, If there are not very many delayed buffers, then it is |
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* time consuming. |
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* |
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* With extent status tree implementation, FIEMAP, SEEK_HOLE/DATA, |
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* bigalloc and writeout can figure out if a block or a range of |
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* blocks is under delayed allocation(belonged to a delayed extent) or |
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* not by searching the extent tree. |
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* |
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* |
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* ========================================================================== |
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* 2. Ext4 extent status tree impelmentation |
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* |
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* -- extent |
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* A extent is a range of blocks which are contiguous logically and |
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* physically. Unlike extent in extent tree, this extent in ext4 is |
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* a in-memory struct, there is no corresponding on-disk data. There |
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* is no limit on length of extent, so an extent can contain as many |
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* blocks as they are contiguous logically and physically. |
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* |
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* -- extent status tree |
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* Every inode has an extent status tree and all allocation blocks |
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* are added to the tree with different status. The extent in the |
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* tree are ordered by logical block no. |
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* |
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* -- operations on a extent status tree |
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* There are three important operations on a delayed extent tree: find |
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* next extent, adding a extent(a range of blocks) and removing a extent. |
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* |
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* -- race on a extent status tree |
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* Extent status tree is protected by inode->i_es_lock. |
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* |
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* -- memory consumption |
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* Fragmented extent tree will make extent status tree cost too much |
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* memory. Hence, we will reclaim written/unwritten/hole extents from |
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* the tree under a heavy memory pressure. |
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* |
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* |
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* ========================================================================== |
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* 3. Performance analysis |
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* |
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* -- overhead |
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* 1. There is a cache extent for write access, so if writes are |
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* not very random, adding space operaions are in O(1) time. |
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* |
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* -- gain |
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* 2. Code is much simpler, more readable, more maintainable and |
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* more efficient. |
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* |
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* |
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* ========================================================================== |
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* 4. TODO list |
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* |
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* -- Refactor delayed space reservation |
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* |
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* -- Extent-level locking |
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*/ |
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|
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static struct kmem_cache *ext4_es_cachep; |
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static struct kmem_cache *ext4_pending_cachep; |
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|
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static int __es_insert_extent(struct inode *inode, struct extent_status *newes); |
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static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
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ext4_lblk_t end, int *reserved); |
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static int es_reclaim_extents(struct ext4_inode_info *ei, int *nr_to_scan); |
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static int __es_shrink(struct ext4_sb_info *sbi, int nr_to_scan, |
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struct ext4_inode_info *locked_ei); |
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static void __revise_pending(struct inode *inode, ext4_lblk_t lblk, |
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ext4_lblk_t len); |
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|
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int __init ext4_init_es(void) |
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{ |
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ext4_es_cachep = kmem_cache_create("ext4_extent_status", |
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sizeof(struct extent_status), |
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0, (SLAB_RECLAIM_ACCOUNT), NULL); |
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if (ext4_es_cachep == NULL) |
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return -ENOMEM; |
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return 0; |
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} |
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|
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void ext4_exit_es(void) |
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{ |
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kmem_cache_destroy(ext4_es_cachep); |
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} |
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|
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void ext4_es_init_tree(struct ext4_es_tree *tree) |
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{ |
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tree->root = RB_ROOT; |
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tree->cache_es = NULL; |
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} |
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|
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#ifdef ES_DEBUG__ |
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static void ext4_es_print_tree(struct inode *inode) |
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{ |
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struct ext4_es_tree *tree; |
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struct rb_node *node; |
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|
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printk(KERN_DEBUG "status extents for inode %lu:", inode->i_ino); |
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tree = &EXT4_I(inode)->i_es_tree; |
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node = rb_first(&tree->root); |
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while (node) { |
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struct extent_status *es; |
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es = rb_entry(node, struct extent_status, rb_node); |
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printk(KERN_DEBUG " [%u/%u) %llu %x", |
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es->es_lblk, es->es_len, |
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ext4_es_pblock(es), ext4_es_status(es)); |
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node = rb_next(node); |
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} |
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printk(KERN_DEBUG "\n"); |
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} |
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#else |
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#define ext4_es_print_tree(inode) |
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#endif |
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|
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static inline ext4_lblk_t ext4_es_end(struct extent_status *es) |
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{ |
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BUG_ON(es->es_lblk + es->es_len < es->es_lblk); |
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return es->es_lblk + es->es_len - 1; |
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} |
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|
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/* |
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* search through the tree for an delayed extent with a given offset. If |
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* it can't be found, try to find next extent. |
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*/ |
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static struct extent_status *__es_tree_search(struct rb_root *root, |
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ext4_lblk_t lblk) |
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{ |
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struct rb_node *node = root->rb_node; |
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struct extent_status *es = NULL; |
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|
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while (node) { |
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es = rb_entry(node, struct extent_status, rb_node); |
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if (lblk < es->es_lblk) |
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node = node->rb_left; |
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else if (lblk > ext4_es_end(es)) |
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node = node->rb_right; |
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else |
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return es; |
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} |
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|
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if (es && lblk < es->es_lblk) |
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return es; |
|
|
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if (es && lblk > ext4_es_end(es)) { |
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node = rb_next(&es->rb_node); |
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return node ? rb_entry(node, struct extent_status, rb_node) : |
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NULL; |
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} |
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|
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return NULL; |
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} |
|
|
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/* |
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* ext4_es_find_extent_range - find extent with specified status within block |
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* range or next extent following block range in |
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* extents status tree |
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* |
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* @inode - file containing the range |
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* @matching_fn - pointer to function that matches extents with desired status |
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* @lblk - logical block defining start of range |
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* @end - logical block defining end of range |
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* @es - extent found, if any |
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* |
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* Find the first extent within the block range specified by @lblk and @end |
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* in the extents status tree that satisfies @matching_fn. If a match |
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* is found, it's returned in @es. If not, and a matching extent is found |
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* beyond the block range, it's returned in @es. If no match is found, an |
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* extent is returned in @es whose es_lblk, es_len, and es_pblk components |
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* are 0. |
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*/ |
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static void __es_find_extent_range(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
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ext4_lblk_t lblk, ext4_lblk_t end, |
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struct extent_status *es) |
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{ |
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struct ext4_es_tree *tree = NULL; |
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struct extent_status *es1 = NULL; |
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struct rb_node *node; |
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|
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WARN_ON(es == NULL); |
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WARN_ON(end < lblk); |
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|
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tree = &EXT4_I(inode)->i_es_tree; |
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|
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/* see if the extent has been cached */ |
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es->es_lblk = es->es_len = es->es_pblk = 0; |
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if (tree->cache_es) { |
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es1 = tree->cache_es; |
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if (in_range(lblk, es1->es_lblk, es1->es_len)) { |
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es_debug("%u cached by [%u/%u) %llu %x\n", |
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lblk, es1->es_lblk, es1->es_len, |
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ext4_es_pblock(es1), ext4_es_status(es1)); |
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goto out; |
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} |
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} |
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|
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es1 = __es_tree_search(&tree->root, lblk); |
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|
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out: |
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if (es1 && !matching_fn(es1)) { |
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while ((node = rb_next(&es1->rb_node)) != NULL) { |
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es1 = rb_entry(node, struct extent_status, rb_node); |
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if (es1->es_lblk > end) { |
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es1 = NULL; |
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break; |
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} |
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if (matching_fn(es1)) |
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break; |
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} |
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} |
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|
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if (es1 && matching_fn(es1)) { |
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tree->cache_es = es1; |
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es->es_lblk = es1->es_lblk; |
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es->es_len = es1->es_len; |
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es->es_pblk = es1->es_pblk; |
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} |
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|
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} |
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|
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/* |
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* Locking for __es_find_extent_range() for external use |
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*/ |
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void ext4_es_find_extent_range(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
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ext4_lblk_t lblk, ext4_lblk_t end, |
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struct extent_status *es) |
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{ |
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if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
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return; |
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|
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trace_ext4_es_find_extent_range_enter(inode, lblk); |
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|
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read_lock(&EXT4_I(inode)->i_es_lock); |
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__es_find_extent_range(inode, matching_fn, lblk, end, es); |
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read_unlock(&EXT4_I(inode)->i_es_lock); |
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|
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trace_ext4_es_find_extent_range_exit(inode, es); |
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} |
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|
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/* |
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* __es_scan_range - search block range for block with specified status |
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* in extents status tree |
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* |
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* @inode - file containing the range |
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* @matching_fn - pointer to function that matches extents with desired status |
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* @lblk - logical block defining start of range |
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* @end - logical block defining end of range |
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* |
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* Returns true if at least one block in the specified block range satisfies |
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* the criterion specified by @matching_fn, and false if not. If at least |
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* one extent has the specified status, then there is at least one block |
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* in the cluster with that status. Should only be called by code that has |
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* taken i_es_lock. |
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*/ |
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static bool __es_scan_range(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
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ext4_lblk_t start, ext4_lblk_t end) |
|
{ |
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struct extent_status es; |
|
|
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__es_find_extent_range(inode, matching_fn, start, end, &es); |
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if (es.es_len == 0) |
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return false; /* no matching extent in the tree */ |
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else if (es.es_lblk <= start && |
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start < es.es_lblk + es.es_len) |
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return true; |
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else if (start <= es.es_lblk && es.es_lblk <= end) |
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return true; |
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else |
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return false; |
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} |
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/* |
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* Locking for __es_scan_range() for external use |
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*/ |
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bool ext4_es_scan_range(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
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ext4_lblk_t lblk, ext4_lblk_t end) |
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{ |
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bool ret; |
|
|
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if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
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return false; |
|
|
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read_lock(&EXT4_I(inode)->i_es_lock); |
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ret = __es_scan_range(inode, matching_fn, lblk, end); |
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read_unlock(&EXT4_I(inode)->i_es_lock); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
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* __es_scan_clu - search cluster for block with specified status in |
|
* extents status tree |
|
* |
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* @inode - file containing the cluster |
|
* @matching_fn - pointer to function that matches extents with desired status |
|
* @lblk - logical block in cluster to be searched |
|
* |
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* Returns true if at least one extent in the cluster containing @lblk |
|
* satisfies the criterion specified by @matching_fn, and false if not. If at |
|
* least one extent has the specified status, then there is at least one block |
|
* in the cluster with that status. Should only be called by code that has |
|
* taken i_es_lock. |
|
*/ |
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static bool __es_scan_clu(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
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ext4_lblk_t lblk) |
|
{ |
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
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ext4_lblk_t lblk_start, lblk_end; |
|
|
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lblk_start = EXT4_LBLK_CMASK(sbi, lblk); |
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lblk_end = lblk_start + sbi->s_cluster_ratio - 1; |
|
|
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return __es_scan_range(inode, matching_fn, lblk_start, lblk_end); |
|
} |
|
|
|
/* |
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* Locking for __es_scan_clu() for external use |
|
*/ |
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bool ext4_es_scan_clu(struct inode *inode, |
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int (*matching_fn)(struct extent_status *es), |
|
ext4_lblk_t lblk) |
|
{ |
|
bool ret; |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return false; |
|
|
|
read_lock(&EXT4_I(inode)->i_es_lock); |
|
ret = __es_scan_clu(inode, matching_fn, lblk); |
|
read_unlock(&EXT4_I(inode)->i_es_lock); |
|
|
|
return ret; |
|
} |
|
|
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static void ext4_es_list_add(struct inode *inode) |
|
{ |
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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)) { |
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list_add_tail(&ei->i_es_list, &sbi->s_es_list); |
|
sbi->s_es_nr_inode++; |
|
} |
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spin_unlock(&sbi->s_es_lock); |
|
} |
|
|
|
static void ext4_es_list_del(struct inode *inode) |
|
{ |
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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(); |
|
} |
|
} 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(); |
|
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; |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return 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, NULL); |
|
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; |
|
|
|
if (sbi->s_cluster_ratio > 1 && test_opt(inode->i_sb, DELALLOC) && |
|
(status & EXTENT_STATUS_WRITTEN || |
|
status & EXTENT_STATUS_UNWRITTEN)) |
|
__revise_pending(inode, lblk, len); |
|
|
|
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; |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return; |
|
|
|
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, |
|
ext4_lblk_t *next_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; |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return 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); |
|
percpu_counter_inc(&stats->es_stats_cache_hits); |
|
if (next_lblk) { |
|
node = rb_next(&es1->rb_node); |
|
if (node) { |
|
es1 = rb_entry(node, struct extent_status, |
|
rb_node); |
|
*next_lblk = es1->es_lblk; |
|
} else |
|
*next_lblk = 0; |
|
} |
|
} else { |
|
percpu_counter_inc(&stats->es_stats_cache_misses); |
|
} |
|
|
|
read_unlock(&EXT4_I(inode)->i_es_lock); |
|
|
|
trace_ext4_es_lookup_extent_exit(inode, es, found); |
|
return found; |
|
} |
|
|
|
struct rsvd_count { |
|
int ndelonly; |
|
bool first_do_lblk_found; |
|
ext4_lblk_t first_do_lblk; |
|
ext4_lblk_t last_do_lblk; |
|
struct extent_status *left_es; |
|
bool partial; |
|
ext4_lblk_t lclu; |
|
}; |
|
|
|
/* |
|
* init_rsvd - initialize reserved count data before removing block range |
|
* in file from extent status tree |
|
* |
|
* @inode - file containing range |
|
* @lblk - first block in range |
|
* @es - pointer to first extent in range |
|
* @rc - pointer to reserved count data |
|
* |
|
* Assumes es is not NULL |
|
*/ |
|
static void init_rsvd(struct inode *inode, ext4_lblk_t lblk, |
|
struct extent_status *es, struct rsvd_count *rc) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct rb_node *node; |
|
|
|
rc->ndelonly = 0; |
|
|
|
/* |
|
* for bigalloc, note the first delonly block in the range has not |
|
* been found, record the extent containing the block to the left of |
|
* the region to be removed, if any, and note that there's no partial |
|
* cluster to track |
|
*/ |
|
if (sbi->s_cluster_ratio > 1) { |
|
rc->first_do_lblk_found = false; |
|
if (lblk > es->es_lblk) { |
|
rc->left_es = es; |
|
} else { |
|
node = rb_prev(&es->rb_node); |
|
rc->left_es = node ? rb_entry(node, |
|
struct extent_status, |
|
rb_node) : NULL; |
|
} |
|
rc->partial = false; |
|
} |
|
} |
|
|
|
/* |
|
* count_rsvd - count the clusters containing delayed and not unwritten |
|
* (delonly) blocks in a range within an extent and add to |
|
* the running tally in rsvd_count |
|
* |
|
* @inode - file containing extent |
|
* @lblk - first block in range |
|
* @len - length of range in blocks |
|
* @es - pointer to extent containing clusters to be counted |
|
* @rc - pointer to reserved count data |
|
* |
|
* Tracks partial clusters found at the beginning and end of extents so |
|
* they aren't overcounted when they span adjacent extents |
|
*/ |
|
static void count_rsvd(struct inode *inode, ext4_lblk_t lblk, long len, |
|
struct extent_status *es, struct rsvd_count *rc) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
ext4_lblk_t i, end, nclu; |
|
|
|
if (!ext4_es_is_delonly(es)) |
|
return; |
|
|
|
WARN_ON(len <= 0); |
|
|
|
if (sbi->s_cluster_ratio == 1) { |
|
rc->ndelonly += (int) len; |
|
return; |
|
} |
|
|
|
/* bigalloc */ |
|
|
|
i = (lblk < es->es_lblk) ? es->es_lblk : lblk; |
|
end = lblk + (ext4_lblk_t) len - 1; |
|
end = (end > ext4_es_end(es)) ? ext4_es_end(es) : end; |
|
|
|
/* record the first block of the first delonly extent seen */ |
|
if (!rc->first_do_lblk_found) { |
|
rc->first_do_lblk = i; |
|
rc->first_do_lblk_found = true; |
|
} |
|
|
|
/* update the last lblk in the region seen so far */ |
|
rc->last_do_lblk = end; |
|
|
|
/* |
|
* if we're tracking a partial cluster and the current extent |
|
* doesn't start with it, count it and stop tracking |
|
*/ |
|
if (rc->partial && (rc->lclu != EXT4_B2C(sbi, i))) { |
|
rc->ndelonly++; |
|
rc->partial = false; |
|
} |
|
|
|
/* |
|
* if the first cluster doesn't start on a cluster boundary but |
|
* ends on one, count it |
|
*/ |
|
if (EXT4_LBLK_COFF(sbi, i) != 0) { |
|
if (end >= EXT4_LBLK_CFILL(sbi, i)) { |
|
rc->ndelonly++; |
|
rc->partial = false; |
|
i = EXT4_LBLK_CFILL(sbi, i) + 1; |
|
} |
|
} |
|
|
|
/* |
|
* if the current cluster starts on a cluster boundary, count the |
|
* number of whole delonly clusters in the extent |
|
*/ |
|
if ((i + sbi->s_cluster_ratio - 1) <= end) { |
|
nclu = (end - i + 1) >> sbi->s_cluster_bits; |
|
rc->ndelonly += nclu; |
|
i += nclu << sbi->s_cluster_bits; |
|
} |
|
|
|
/* |
|
* start tracking a partial cluster if there's a partial at the end |
|
* of the current extent and we're not already tracking one |
|
*/ |
|
if (!rc->partial && i <= end) { |
|
rc->partial = true; |
|
rc->lclu = EXT4_B2C(sbi, i); |
|
} |
|
} |
|
|
|
/* |
|
* __pr_tree_search - search for a pending cluster reservation |
|
* |
|
* @root - root of pending reservation tree |
|
* @lclu - logical cluster to search for |
|
* |
|
* Returns the pending reservation for the cluster identified by @lclu |
|
* if found. If not, returns a reservation for the next cluster if any, |
|
* and if not, returns NULL. |
|
*/ |
|
static struct pending_reservation *__pr_tree_search(struct rb_root *root, |
|
ext4_lblk_t lclu) |
|
{ |
|
struct rb_node *node = root->rb_node; |
|
struct pending_reservation *pr = NULL; |
|
|
|
while (node) { |
|
pr = rb_entry(node, struct pending_reservation, rb_node); |
|
if (lclu < pr->lclu) |
|
node = node->rb_left; |
|
else if (lclu > pr->lclu) |
|
node = node->rb_right; |
|
else |
|
return pr; |
|
} |
|
if (pr && lclu < pr->lclu) |
|
return pr; |
|
if (pr && lclu > pr->lclu) { |
|
node = rb_next(&pr->rb_node); |
|
return node ? rb_entry(node, struct pending_reservation, |
|
rb_node) : NULL; |
|
} |
|
return NULL; |
|
} |
|
|
|
/* |
|
* get_rsvd - calculates and returns the number of cluster reservations to be |
|
* released when removing a block range from the extent status tree |
|
* and releases any pending reservations within the range |
|
* |
|
* @inode - file containing block range |
|
* @end - last block in range |
|
* @right_es - pointer to extent containing next block beyond end or NULL |
|
* @rc - pointer to reserved count data |
|
* |
|
* The number of reservations to be released is equal to the number of |
|
* clusters containing delayed and not unwritten (delonly) blocks within |
|
* the range, minus the number of clusters still containing delonly blocks |
|
* at the ends of the range, and minus the number of pending reservations |
|
* within the range. |
|
*/ |
|
static unsigned int get_rsvd(struct inode *inode, ext4_lblk_t end, |
|
struct extent_status *right_es, |
|
struct rsvd_count *rc) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct pending_reservation *pr; |
|
struct ext4_pending_tree *tree = &EXT4_I(inode)->i_pending_tree; |
|
struct rb_node *node; |
|
ext4_lblk_t first_lclu, last_lclu; |
|
bool left_delonly, right_delonly, count_pending; |
|
struct extent_status *es; |
|
|
|
if (sbi->s_cluster_ratio > 1) { |
|
/* count any remaining partial cluster */ |
|
if (rc->partial) |
|
rc->ndelonly++; |
|
|
|
if (rc->ndelonly == 0) |
|
return 0; |
|
|
|
first_lclu = EXT4_B2C(sbi, rc->first_do_lblk); |
|
last_lclu = EXT4_B2C(sbi, rc->last_do_lblk); |
|
|
|
/* |
|
* decrease the delonly count by the number of clusters at the |
|
* ends of the range that still contain delonly blocks - |
|
* these clusters still need to be reserved |
|
*/ |
|
left_delonly = right_delonly = false; |
|
|
|
es = rc->left_es; |
|
while (es && ext4_es_end(es) >= |
|
EXT4_LBLK_CMASK(sbi, rc->first_do_lblk)) { |
|
if (ext4_es_is_delonly(es)) { |
|
rc->ndelonly--; |
|
left_delonly = true; |
|
break; |
|
} |
|
node = rb_prev(&es->rb_node); |
|
if (!node) |
|
break; |
|
es = rb_entry(node, struct extent_status, rb_node); |
|
} |
|
if (right_es && (!left_delonly || first_lclu != last_lclu)) { |
|
if (end < ext4_es_end(right_es)) { |
|
es = right_es; |
|
} else { |
|
node = rb_next(&right_es->rb_node); |
|
es = node ? rb_entry(node, struct extent_status, |
|
rb_node) : NULL; |
|
} |
|
while (es && es->es_lblk <= |
|
EXT4_LBLK_CFILL(sbi, rc->last_do_lblk)) { |
|
if (ext4_es_is_delonly(es)) { |
|
rc->ndelonly--; |
|
right_delonly = true; |
|
break; |
|
} |
|
node = rb_next(&es->rb_node); |
|
if (!node) |
|
break; |
|
es = rb_entry(node, struct extent_status, |
|
rb_node); |
|
} |
|
} |
|
|
|
/* |
|
* Determine the block range that should be searched for |
|
* pending reservations, if any. Clusters on the ends of the |
|
* original removed range containing delonly blocks are |
|
* excluded. They've already been accounted for and it's not |
|
* possible to determine if an associated pending reservation |
|
* should be released with the information available in the |
|
* extents status tree. |
|
*/ |
|
if (first_lclu == last_lclu) { |
|
if (left_delonly | right_delonly) |
|
count_pending = false; |
|
else |
|
count_pending = true; |
|
} else { |
|
if (left_delonly) |
|
first_lclu++; |
|
if (right_delonly) |
|
last_lclu--; |
|
if (first_lclu <= last_lclu) |
|
count_pending = true; |
|
else |
|
count_pending = false; |
|
} |
|
|
|
/* |
|
* a pending reservation found between first_lclu and last_lclu |
|
* represents an allocated cluster that contained at least one |
|
* delonly block, so the delonly total must be reduced by one |
|
* for each pending reservation found and released |
|
*/ |
|
if (count_pending) { |
|
pr = __pr_tree_search(&tree->root, first_lclu); |
|
while (pr && pr->lclu <= last_lclu) { |
|
rc->ndelonly--; |
|
node = rb_next(&pr->rb_node); |
|
rb_erase(&pr->rb_node, &tree->root); |
|
kmem_cache_free(ext4_pending_cachep, pr); |
|
if (!node) |
|
break; |
|
pr = rb_entry(node, struct pending_reservation, |
|
rb_node); |
|
} |
|
} |
|
} |
|
return rc->ndelonly; |
|
} |
|
|
|
|
|
/* |
|
* __es_remove_extent - removes block range from extent status tree |
|
* |
|
* @inode - file containing range |
|
* @lblk - first block in range |
|
* @end - last block in range |
|
* @reserved - number of cluster reservations released |
|
* |
|
* If @reserved is not NULL and delayed allocation is enabled, counts |
|
* block/cluster reservations freed by removing range and if bigalloc |
|
* enabled cancels pending reservations as needed. Returns 0 on success, |
|
* error code on failure. |
|
*/ |
|
static int __es_remove_extent(struct inode *inode, ext4_lblk_t lblk, |
|
ext4_lblk_t end, int *reserved) |
|
{ |
|
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; |
|
bool count_reserved = true; |
|
struct rsvd_count rc; |
|
|
|
if (reserved == NULL || !test_opt(inode->i_sb, DELALLOC)) |
|
count_reserved = false; |
|
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; |
|
if (count_reserved) |
|
init_rsvd(inode, lblk, es, &rc); |
|
|
|
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); |
|
} |
|
} |
|
if (count_reserved) |
|
count_rsvd(inode, lblk, orig_es.es_len - len1 - len2, |
|
&orig_es, &rc); |
|
goto out; |
|
} |
|
|
|
if (len1 > 0) { |
|
if (count_reserved) |
|
count_rsvd(inode, lblk, orig_es.es_len - len1, |
|
&orig_es, &rc); |
|
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) { |
|
if (count_reserved) |
|
count_rsvd(inode, es->es_lblk, es->es_len, es, &rc); |
|
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; |
|
if (count_reserved) |
|
count_rsvd(inode, es->es_lblk, orig_len - len1, |
|
es, &rc); |
|
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); |
|
} |
|
} |
|
|
|
if (count_reserved) |
|
*reserved = get_rsvd(inode, end, es, &rc); |
|
out: |
|
return err; |
|
} |
|
|
|
/* |
|
* ext4_es_remove_extent - removes block range from extent status tree |
|
* |
|
* @inode - file containing range |
|
* @lblk - first block in range |
|
* @len - number of blocks to remove |
|
* |
|
* Reduces block/cluster reservation count and for bigalloc cancels pending |
|
* reservations as needed. Returns 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; |
|
int reserved = 0; |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return 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, &reserved); |
|
write_unlock(&EXT4_I(inode)->i_es_lock); |
|
ext4_es_print_tree(inode); |
|
ext4_da_release_space(inode, reserved); |
|
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); |
|
|
|
nr_shrunk = __es_shrink(sbi, nr_to_scan, NULL); |
|
|
|
ret = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_shk_cnt); |
|
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, " %lld/%lld cache hits/misses\n", |
|
percpu_counter_sum_positive(&es_stats->es_stats_cache_hits), |
|
percpu_counter_sum_positive(&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; |
|
err = percpu_counter_init(&sbi->s_es_stats.es_stats_cache_hits, 0, |
|
GFP_KERNEL); |
|
if (err) |
|
return err; |
|
err = percpu_counter_init(&sbi->s_es_stats.es_stats_cache_misses, 0, |
|
GFP_KERNEL); |
|
if (err) |
|
goto err1; |
|
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) |
|
goto err2; |
|
err = percpu_counter_init(&sbi->s_es_stats.es_stats_shk_cnt, 0, GFP_KERNEL); |
|
if (err) |
|
goto err3; |
|
|
|
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 err4; |
|
|
|
return 0; |
|
err4: |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_shk_cnt); |
|
err3: |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt); |
|
err2: |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses); |
|
err1: |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_hits); |
|
return err; |
|
} |
|
|
|
void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi) |
|
{ |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_hits); |
|
percpu_counter_destroy(&sbi->s_es_stats.es_stats_cache_misses); |
|
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; |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* Called to support EXT4_IOC_CLEAR_ES_CACHE. We can only remove |
|
* discretionary entries from the extent status cache. (Some entries |
|
* must be present for proper operations.) |
|
*/ |
|
void ext4_clear_inode_es(struct inode *inode) |
|
{ |
|
struct ext4_inode_info *ei = EXT4_I(inode); |
|
struct extent_status *es; |
|
struct ext4_es_tree *tree; |
|
struct rb_node *node; |
|
|
|
write_lock(&ei->i_es_lock); |
|
tree = &EXT4_I(inode)->i_es_tree; |
|
tree->cache_es = NULL; |
|
node = rb_first(&tree->root); |
|
while (node) { |
|
es = rb_entry(node, struct extent_status, rb_node); |
|
node = rb_next(node); |
|
if (!ext4_es_is_delayed(es)) { |
|
rb_erase(&es->rb_node, &tree->root); |
|
ext4_es_free_extent(inode, es); |
|
} |
|
} |
|
ext4_clear_inode_state(inode, EXT4_STATE_EXT_PRECACHED); |
|
write_unlock(&ei->i_es_lock); |
|
} |
|
|
|
#ifdef ES_DEBUG__ |
|
static void ext4_print_pending_tree(struct inode *inode) |
|
{ |
|
struct ext4_pending_tree *tree; |
|
struct rb_node *node; |
|
struct pending_reservation *pr; |
|
|
|
printk(KERN_DEBUG "pending reservations for inode %lu:", inode->i_ino); |
|
tree = &EXT4_I(inode)->i_pending_tree; |
|
node = rb_first(&tree->root); |
|
while (node) { |
|
pr = rb_entry(node, struct pending_reservation, rb_node); |
|
printk(KERN_DEBUG " %u", pr->lclu); |
|
node = rb_next(node); |
|
} |
|
printk(KERN_DEBUG "\n"); |
|
} |
|
#else |
|
#define ext4_print_pending_tree(inode) |
|
#endif |
|
|
|
int __init ext4_init_pending(void) |
|
{ |
|
ext4_pending_cachep = kmem_cache_create("ext4_pending_reservation", |
|
sizeof(struct pending_reservation), |
|
0, (SLAB_RECLAIM_ACCOUNT), NULL); |
|
if (ext4_pending_cachep == NULL) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
|
|
void ext4_exit_pending(void) |
|
{ |
|
kmem_cache_destroy(ext4_pending_cachep); |
|
} |
|
|
|
void ext4_init_pending_tree(struct ext4_pending_tree *tree) |
|
{ |
|
tree->root = RB_ROOT; |
|
} |
|
|
|
/* |
|
* __get_pending - retrieve a pointer to a pending reservation |
|
* |
|
* @inode - file containing the pending cluster reservation |
|
* @lclu - logical cluster of interest |
|
* |
|
* Returns a pointer to a pending reservation if it's a member of |
|
* the set, and NULL if not. Must be called holding i_es_lock. |
|
*/ |
|
static struct pending_reservation *__get_pending(struct inode *inode, |
|
ext4_lblk_t lclu) |
|
{ |
|
struct ext4_pending_tree *tree; |
|
struct rb_node *node; |
|
struct pending_reservation *pr = NULL; |
|
|
|
tree = &EXT4_I(inode)->i_pending_tree; |
|
node = (&tree->root)->rb_node; |
|
|
|
while (node) { |
|
pr = rb_entry(node, struct pending_reservation, rb_node); |
|
if (lclu < pr->lclu) |
|
node = node->rb_left; |
|
else if (lclu > pr->lclu) |
|
node = node->rb_right; |
|
else if (lclu == pr->lclu) |
|
return pr; |
|
} |
|
return NULL; |
|
} |
|
|
|
/* |
|
* __insert_pending - adds a pending cluster reservation to the set of |
|
* pending reservations |
|
* |
|
* @inode - file containing the cluster |
|
* @lblk - logical block in the cluster to be added |
|
* |
|
* Returns 0 on successful insertion and -ENOMEM on failure. If the |
|
* pending reservation is already in the set, returns successfully. |
|
*/ |
|
static int __insert_pending(struct inode *inode, ext4_lblk_t lblk) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct ext4_pending_tree *tree = &EXT4_I(inode)->i_pending_tree; |
|
struct rb_node **p = &tree->root.rb_node; |
|
struct rb_node *parent = NULL; |
|
struct pending_reservation *pr; |
|
ext4_lblk_t lclu; |
|
int ret = 0; |
|
|
|
lclu = EXT4_B2C(sbi, lblk); |
|
/* search to find parent for insertion */ |
|
while (*p) { |
|
parent = *p; |
|
pr = rb_entry(parent, struct pending_reservation, rb_node); |
|
|
|
if (lclu < pr->lclu) { |
|
p = &(*p)->rb_left; |
|
} else if (lclu > pr->lclu) { |
|
p = &(*p)->rb_right; |
|
} else { |
|
/* pending reservation already inserted */ |
|
goto out; |
|
} |
|
} |
|
|
|
pr = kmem_cache_alloc(ext4_pending_cachep, GFP_ATOMIC); |
|
if (pr == NULL) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
pr->lclu = lclu; |
|
|
|
rb_link_node(&pr->rb_node, parent, p); |
|
rb_insert_color(&pr->rb_node, &tree->root); |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* |
|
* __remove_pending - removes a pending cluster reservation from the set |
|
* of pending reservations |
|
* |
|
* @inode - file containing the cluster |
|
* @lblk - logical block in the pending cluster reservation to be removed |
|
* |
|
* Returns successfully if pending reservation is not a member of the set. |
|
*/ |
|
static void __remove_pending(struct inode *inode, ext4_lblk_t lblk) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct pending_reservation *pr; |
|
struct ext4_pending_tree *tree; |
|
|
|
pr = __get_pending(inode, EXT4_B2C(sbi, lblk)); |
|
if (pr != NULL) { |
|
tree = &EXT4_I(inode)->i_pending_tree; |
|
rb_erase(&pr->rb_node, &tree->root); |
|
kmem_cache_free(ext4_pending_cachep, pr); |
|
} |
|
} |
|
|
|
/* |
|
* ext4_remove_pending - removes a pending cluster reservation from the set |
|
* of pending reservations |
|
* |
|
* @inode - file containing the cluster |
|
* @lblk - logical block in the pending cluster reservation to be removed |
|
* |
|
* Locking for external use of __remove_pending. |
|
*/ |
|
void ext4_remove_pending(struct inode *inode, ext4_lblk_t lblk) |
|
{ |
|
struct ext4_inode_info *ei = EXT4_I(inode); |
|
|
|
write_lock(&ei->i_es_lock); |
|
__remove_pending(inode, lblk); |
|
write_unlock(&ei->i_es_lock); |
|
} |
|
|
|
/* |
|
* ext4_is_pending - determine whether a cluster has a pending reservation |
|
* on it |
|
* |
|
* @inode - file containing the cluster |
|
* @lblk - logical block in the cluster |
|
* |
|
* Returns true if there's a pending reservation for the cluster in the |
|
* set of pending reservations, and false if not. |
|
*/ |
|
bool ext4_is_pending(struct inode *inode, ext4_lblk_t lblk) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct ext4_inode_info *ei = EXT4_I(inode); |
|
bool ret; |
|
|
|
read_lock(&ei->i_es_lock); |
|
ret = (bool)(__get_pending(inode, EXT4_B2C(sbi, lblk)) != NULL); |
|
read_unlock(&ei->i_es_lock); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* ext4_es_insert_delayed_block - adds a delayed block to the extents status |
|
* tree, adding a pending reservation where |
|
* needed |
|
* |
|
* @inode - file containing the newly added block |
|
* @lblk - logical block to be added |
|
* @allocated - indicates whether a physical cluster has been allocated for |
|
* the logical cluster that contains the block |
|
* |
|
* Returns 0 on success, negative error code on failure. |
|
*/ |
|
int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk, |
|
bool allocated) |
|
{ |
|
struct extent_status newes; |
|
int err = 0; |
|
|
|
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY) |
|
return 0; |
|
|
|
es_debug("add [%u/1) delayed to extent status tree of inode %lu\n", |
|
lblk, inode->i_ino); |
|
|
|
newes.es_lblk = lblk; |
|
newes.es_len = 1; |
|
ext4_es_store_pblock_status(&newes, ~0, EXTENT_STATUS_DELAYED); |
|
trace_ext4_es_insert_delayed_block(inode, &newes, allocated); |
|
|
|
ext4_es_insert_extent_check(inode, &newes); |
|
|
|
write_lock(&EXT4_I(inode)->i_es_lock); |
|
|
|
err = __es_remove_extent(inode, lblk, lblk, NULL); |
|
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 != 0) |
|
goto error; |
|
|
|
if (allocated) |
|
__insert_pending(inode, lblk); |
|
|
|
error: |
|
write_unlock(&EXT4_I(inode)->i_es_lock); |
|
|
|
ext4_es_print_tree(inode); |
|
ext4_print_pending_tree(inode); |
|
|
|
return err; |
|
} |
|
|
|
/* |
|
* __es_delayed_clu - count number of clusters containing blocks that |
|
* are delayed only |
|
* |
|
* @inode - file containing block range |
|
* @start - logical block defining start of range |
|
* @end - logical block defining end of range |
|
* |
|
* Returns the number of clusters containing only delayed (not delayed |
|
* and unwritten) blocks in the range specified by @start and @end. Any |
|
* cluster or part of a cluster within the range and containing a delayed |
|
* and not unwritten block within the range is counted as a whole cluster. |
|
*/ |
|
static unsigned int __es_delayed_clu(struct inode *inode, ext4_lblk_t start, |
|
ext4_lblk_t end) |
|
{ |
|
struct ext4_es_tree *tree = &EXT4_I(inode)->i_es_tree; |
|
struct extent_status *es; |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct rb_node *node; |
|
ext4_lblk_t first_lclu, last_lclu; |
|
unsigned long long last_counted_lclu; |
|
unsigned int n = 0; |
|
|
|
/* guaranteed to be unequal to any ext4_lblk_t value */ |
|
last_counted_lclu = ~0ULL; |
|
|
|
es = __es_tree_search(&tree->root, start); |
|
|
|
while (es && (es->es_lblk <= end)) { |
|
if (ext4_es_is_delonly(es)) { |
|
if (es->es_lblk <= start) |
|
first_lclu = EXT4_B2C(sbi, start); |
|
else |
|
first_lclu = EXT4_B2C(sbi, es->es_lblk); |
|
|
|
if (ext4_es_end(es) >= end) |
|
last_lclu = EXT4_B2C(sbi, end); |
|
else |
|
last_lclu = EXT4_B2C(sbi, ext4_es_end(es)); |
|
|
|
if (first_lclu == last_counted_lclu) |
|
n += last_lclu - first_lclu; |
|
else |
|
n += last_lclu - first_lclu + 1; |
|
last_counted_lclu = last_lclu; |
|
} |
|
node = rb_next(&es->rb_node); |
|
if (!node) |
|
break; |
|
es = rb_entry(node, struct extent_status, rb_node); |
|
} |
|
|
|
return n; |
|
} |
|
|
|
/* |
|
* ext4_es_delayed_clu - count number of clusters containing blocks that |
|
* are both delayed and unwritten |
|
* |
|
* @inode - file containing block range |
|
* @lblk - logical block defining start of range |
|
* @len - number of blocks in range |
|
* |
|
* Locking for external use of __es_delayed_clu(). |
|
*/ |
|
unsigned int ext4_es_delayed_clu(struct inode *inode, ext4_lblk_t lblk, |
|
ext4_lblk_t len) |
|
{ |
|
struct ext4_inode_info *ei = EXT4_I(inode); |
|
ext4_lblk_t end; |
|
unsigned int n; |
|
|
|
if (len == 0) |
|
return 0; |
|
|
|
end = lblk + len - 1; |
|
WARN_ON(end < lblk); |
|
|
|
read_lock(&ei->i_es_lock); |
|
|
|
n = __es_delayed_clu(inode, lblk, end); |
|
|
|
read_unlock(&ei->i_es_lock); |
|
|
|
return n; |
|
} |
|
|
|
/* |
|
* __revise_pending - makes, cancels, or leaves unchanged pending cluster |
|
* reservations for a specified block range depending |
|
* upon the presence or absence of delayed blocks |
|
* outside the range within clusters at the ends of the |
|
* range |
|
* |
|
* @inode - file containing the range |
|
* @lblk - logical block defining the start of range |
|
* @len - length of range in blocks |
|
* |
|
* Used after a newly allocated extent is added to the extents status tree. |
|
* Requires that the extents in the range have either written or unwritten |
|
* status. Must be called while holding i_es_lock. |
|
*/ |
|
static void __revise_pending(struct inode *inode, ext4_lblk_t lblk, |
|
ext4_lblk_t len) |
|
{ |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
ext4_lblk_t end = lblk + len - 1; |
|
ext4_lblk_t first, last; |
|
bool f_del = false, l_del = false; |
|
|
|
if (len == 0) |
|
return; |
|
|
|
/* |
|
* Two cases - block range within single cluster and block range |
|
* spanning two or more clusters. Note that a cluster belonging |
|
* to a range starting and/or ending on a cluster boundary is treated |
|
* as if it does not contain a delayed extent. The new range may |
|
* have allocated space for previously delayed blocks out to the |
|
* cluster boundary, requiring that any pre-existing pending |
|
* reservation be canceled. Because this code only looks at blocks |
|
* outside the range, it should revise pending reservations |
|
* correctly even if the extent represented by the range can't be |
|
* inserted in the extents status tree due to ENOSPC. |
|
*/ |
|
|
|
if (EXT4_B2C(sbi, lblk) == EXT4_B2C(sbi, end)) { |
|
first = EXT4_LBLK_CMASK(sbi, lblk); |
|
if (first != lblk) |
|
f_del = __es_scan_range(inode, &ext4_es_is_delonly, |
|
first, lblk - 1); |
|
if (f_del) { |
|
__insert_pending(inode, first); |
|
} else { |
|
last = EXT4_LBLK_CMASK(sbi, end) + |
|
sbi->s_cluster_ratio - 1; |
|
if (last != end) |
|
l_del = __es_scan_range(inode, |
|
&ext4_es_is_delonly, |
|
end + 1, last); |
|
if (l_del) |
|
__insert_pending(inode, last); |
|
else |
|
__remove_pending(inode, last); |
|
} |
|
} else { |
|
first = EXT4_LBLK_CMASK(sbi, lblk); |
|
if (first != lblk) |
|
f_del = __es_scan_range(inode, &ext4_es_is_delonly, |
|
first, lblk - 1); |
|
if (f_del) |
|
__insert_pending(inode, first); |
|
else |
|
__remove_pending(inode, first); |
|
|
|
last = EXT4_LBLK_CMASK(sbi, end) + sbi->s_cluster_ratio - 1; |
|
if (last != end) |
|
l_del = __es_scan_range(inode, &ext4_es_is_delonly, |
|
end + 1, last); |
|
if (l_del) |
|
__insert_pending(inode, last); |
|
else |
|
__remove_pending(inode, last); |
|
} |
|
}
|
|
|