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btrfs: zoned: wait for existing extents before truncating

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When truncating a file, file buffers which have already been allocated
but not yet written may be truncated. Truncating these buffers could
cause breakage of a sequential write pattern in a block group if the
truncated blocks are for example followed by blocks allocated to another
file. To avoid this problem, always wait for write out of all unwritten
buffers before proceeding with the truncate execution.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-02-04 19:22:09 +09:00 committed by David Sterba
parent 0bc09ca129
commit 24c0a7227f
1 changed files with 9 additions and 0 deletions
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9
fs/btrfs/inode.c
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@ -5169,6 +5169,15 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr)
btrfs_drew_write_unlock(&root->snapshot_lock);
btrfs_end_transaction(trans);
} else {
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
if (btrfs_is_zoned(fs_info)) {
ret = btrfs_wait_ordered_range(inode,
ALIGN(newsize, fs_info->sectorsize),
(u64)-1);
if (ret)
return ret;
}
/*
* We're truncating a file that used to have good data down to