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Btrfs: do not reduce profile in do_chunk_alloc() 

Every caller of do_chunk_alloc() feeds it the reduced allocation
profile, so stop trying to reduce it one more time.  Instead check the
validity of the passed profile.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2012-01-16 22:04:48 +02:00
parent ea67176ae8
commit 70922617b0
2 changed files with 19 additions and 1 deletions
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18
fs/btrfs/ctree.h
View File

@ -2536,6 +2536,24 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info->super_for_commit);
kfree(fs_info);
}
/**
* profile_is_valid - tests whether a given profile is valid and reduced
* @flags: profile to validate
* @extended: if true @flags is treated as an extended profile
*/
static inline int profile_is_valid(u64 flags, int extended)
{
u64 mask = ~BTRFS_BLOCK_GROUP_PROFILE_MASK;
flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK;
if (extended)
mask &= ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
if (flags & mask)
return 0;
/* true if zero or exactly one bit set */
return (flags & (~flags + 1)) == flags;
}
/* root-item.c */
int btrfs_find_root_ref(struct btrfs_root *tree_root,

2
fs/btrfs/extent-tree.c
View File

@ -3295,7 +3295,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
int wait_for_alloc = 0;
int ret = 0;
flags = btrfs_reduce_alloc_profile(extent_root, flags);
BUG_ON(!profile_is_valid(flags, 0));
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {