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Btrfs: enforce min_bytes parameter during extent allocation

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Commit 24542bf7ea changed preallocation of
extents to cap the max size we try to allocate.  It's a valid change,
but the extent reservation code is also used by balance, and that
can't tolerate a smaller extent being allocated.

__btrfs_prealloc_file_range already has a min_size parameter, which is
used by relocation to request a specific extent size.  This commit
adds an extra check to enforce that minimum extent size.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Reported-by: Stefan Behrens <sbehrens@giantdisaster.de>
This commit is contained in:
Chris Mason 2013-03-05 11:11:26 -05:00
parent d7011f5b9d
commit 154ea28930
1 changed files with 4 additions and 2 deletions
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6
fs/btrfs/inode.c
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@ -8502,6 +8502,7 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
struct btrfs_key ins; struct btrfs_key ins;
u64 cur_offset = start; u64 cur_offset = start;
u64 i_size; u64 i_size;
u64 cur_bytes;
int ret = 0; int ret = 0;
bool own_trans = true; bool own_trans = true;
@ -8516,8 +8517,9 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
} }
} }
ret = btrfs_reserve_extent(trans, root, cur_bytes = min(num_bytes, 256ULL * 1024 * 1024);
min(num_bytes, 256ULL * 1024 * 1024), cur_bytes = max(cur_bytes, min_size);
ret = btrfs_reserve_extent(trans, root, cur_bytes,
min_size, 0, *alloc_hint, &ins, 1); min_size, 0, *alloc_hint, &ins, 1);
if (ret) { if (ret) {
if (own_trans) if (own_trans)