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authorIlya Dryomov <idryomov@gmail.com>2012-03-27 17:09:17 +0300
committerIlya Dryomov <idryomov@gmail.com>2012-03-27 17:09:17 +0300
commite8920a640be5d4ebe3fee0670639a81d4ffc904c (patch)
tree0c999adbdce223ac0365ca98c008da8db7bb7cb3
parent899c81eac890bcfa5f3636f4c43f68e8393ac1f8 (diff)
downloadlinux-linaro-stable-e8920a640be5d4ebe3fee0670639a81d4ffc904c.tar.gz
Btrfs: make profile_is_valid() check more strict
"0" is a valid value for an on-disk chunk profile, but it is not a valid extended profile. (We have a separate bit for single chunks in extended case) Also rename it to alloc_profile_is_valid() for clarity. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
-rw-r--r--fs/btrfs/ctree.h21
-rw-r--r--fs/btrfs/extent-tree.c2
-rw-r--r--fs/btrfs/volumes.c6
3 files changed, 17 insertions, 12 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index aba7832a2285..f057e92df39f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2735,22 +2735,27 @@ static inline void free_fs_info(struct btrfs_fs_info *fs_info)
kfree(fs_info);
}
/**
- * profile_is_valid - tests whether a given profile is valid and reduced
+ * alloc_profile_is_valid - see if 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)
+static inline int alloc_profile_is_valid(u64 flags, int extended)
{
- u64 mask = ~BTRFS_BLOCK_GROUP_PROFILE_MASK;
+ u64 mask = (extended ? BTRFS_EXTENDED_PROFILE_MASK :
+ BTRFS_BLOCK_GROUP_PROFILE_MASK);
flags &= ~BTRFS_BLOCK_GROUP_TYPE_MASK;
- if (extended)
- mask &= ~BTRFS_AVAIL_ALLOC_BIT_SINGLE;
- if (flags & mask)
+ /* 1) check that all other bits are zeroed */
+ if (flags & ~mask)
return 0;
- /* true if zero or exactly one bit set */
- return (flags & (~flags + 1)) == flags;
+
+ /* 2) see if profile is reduced */
+ if (flags == 0)
+ return !extended; /* "0" is valid for usual profiles */
+
+ /* true if exactly one bit set */
+ return (flags & (flags - 1)) == 0;
}
/* root-item.c */
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9f16fdb463c7..8c5bd8fa8245 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3400,7 +3400,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
int wait_for_alloc = 0;
int ret = 0;
- BUG_ON(!profile_is_valid(flags, 0));
+ BUG_ON(!alloc_profile_is_valid(flags, 0));
space_info = __find_space_info(extent_root->fs_info, flags);
if (!space_info) {
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 4b263a2009b0..e4ef0f2fdb73 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2669,7 +2669,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_RAID10);
- if (!profile_is_valid(bctl->data.target, 1) ||
+ if (!alloc_profile_is_valid(bctl->data.target, 1) ||
bctl->data.target & ~allowed) {
printk(KERN_ERR "btrfs: unable to start balance with target "
"data profile %llu\n",
@@ -2677,7 +2677,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
ret = -EINVAL;
goto out;
}
- if (!profile_is_valid(bctl->meta.target, 1) ||
+ if (!alloc_profile_is_valid(bctl->meta.target, 1) ||
bctl->meta.target & ~allowed) {
printk(KERN_ERR "btrfs: unable to start balance with target "
"metadata profile %llu\n",
@@ -2685,7 +2685,7 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
ret = -EINVAL;
goto out;
}
- if (!profile_is_valid(bctl->sys.target, 1) ||
+ if (!alloc_profile_is_valid(bctl->sys.target, 1) ||
bctl->sys.target & ~allowed) {
printk(KERN_ERR "btrfs: unable to start balance with target "
"system profile %llu\n",