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btrfs: always pass readahead state to defrag

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Defrag ioctl passes readahead from the file, but autodefrag does not
have a file so the readahead state is allocated when needed.

The autodefrag loop in cleaner thread iterates over inodes so we can
simply provide an on-stack readahead state and will not need to allocate
it in btrfs_defrag_file(). The size is 32 bytes which is acceptable.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-08-27 04:26:51 +02:00
parent 11e3107d47
commit df2825e985
1 changed files with 11 additions and 21 deletions
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32
fs/btrfs/defrag.c
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@ -219,7 +219,8 @@ void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info)
#define BTRFS_DEFRAG_BATCH 1024
static int btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
struct inode_defrag *defrag)
struct inode_defrag *defrag,
struct file_ra_state *ra)
{
struct btrfs_root *inode_root;
struct inode *inode;
@ -258,9 +259,10 @@ again:
range.len = (u64)-1;
range.start = cur;
range.extent_thresh = defrag->extent_thresh;
file_ra_state_init(ra, inode->i_mapping);
sb_start_write(fs_info->sb);
ret = btrfs_defrag_file(inode, NULL, &range, defrag->transid,
ret = btrfs_defrag_file(inode, ra, &range, defrag->transid,
BTRFS_DEFRAG_BATCH);
sb_end_write(fs_info->sb);
iput(inode);
@ -287,6 +289,8 @@ int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
atomic_inc(&fs_info->defrag_running);
while (1) {
struct file_ra_state ra = { 0 };
/* Pause the auto defragger. */
if (test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state))
break;
@ -309,7 +313,7 @@ int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info)
first_ino = defrag->ino + 1;
root_objectid = defrag->root;
btrfs_run_defrag_inode(fs_info, defrag);
btrfs_run_defrag_inode(fs_info, defrag, &ra);
}
atomic_dec(&fs_info->defrag_running);
@ -1302,8 +1306,7 @@ static int defrag_one_cluster(struct btrfs_inode *inode,
if (entry->start + range_len <= *last_scanned_ret)
continue;
if (ra)
page_cache_sync_readahead(inode->vfs_inode.i_mapping,
page_cache_sync_readahead(inode->vfs_inode.i_mapping,
ra, NULL, entry->start >> PAGE_SHIFT,
((entry->start + range_len - 1) >> PAGE_SHIFT) -
(entry->start >> PAGE_SHIFT) + 1);
@ -1335,7 +1338,7 @@ out:
* Entry point to file defragmentation.
*
* @inode: inode to be defragged
* @ra: readahead state (can be NUL)
* @ra: readahead state
* @range: defrag options including range and flags
* @newer_than: minimum transid to defrag
* @max_to_defrag: max number of sectors to be defragged, if 0, the whole inode
@ -1357,12 +1360,13 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
u64 cur;
u64 last_byte;
bool do_compress = (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS);
bool ra_allocated = false;
int compress_type = BTRFS_COMPRESS_ZLIB;
int ret = 0;
u32 extent_thresh = range->extent_thresh;
pgoff_t start_index;
ASSERT(ra);
if (isize == 0)
return 0;
@ -1391,18 +1395,6 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
cur = round_down(range->start, fs_info->sectorsize);
last_byte = round_up(last_byte, fs_info->sectorsize) - 1;
/*
* If we were not given a ra, allocate a readahead context. As
* readahead is just an optimization, defrag will work without it so
* we don't error out.
*/
if (!ra) {
ra_allocated = true;
ra = kzalloc(sizeof(*ra), GFP_KERNEL);
if (ra)
file_ra_state_init(ra, inode->i_mapping);
}
/*
* Make writeback start from the beginning of the range, so that the
* defrag range can be written sequentially.
@ -1457,8 +1449,6 @@ int btrfs_defrag_file(struct inode *inode, struct file_ra_state *ra,
cond_resched();
}
if (ra_allocated)
kfree(ra);
/*
* Update range.start for autodefrag, this will indicate where to start
* in next run.