diff options
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 06dc95caa6f1..66c1d65bd476 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7782,10 +7782,12 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, } /* - * this will cow the extent, reset the len in case we changed - * it above + * this will cow the extent, if em is within [start, len], then + * probably we've found a preallocated/existing extent, let's + * give it a chance to use preallocated space. */ - len = bh_result->b_size; + len = min_t(u64, bh_result->b_size, em->len - (start - em->start)); + len = ALIGN(len, root->sectorsize); free_extent_map(em); em = btrfs_new_extent_direct(inode, start, len); if (IS_ERR(em)) { |