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Commit e8920a64 authored by Ilya Dryomov's avatar Ilya Dryomov
Browse files

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: default avatarIlya Dryomov <idryomov@gmail.com>
parent 899c81ea

fs/btrfs/ctree.h

+13 −8
Original line number Diff line number Diff line
@@ -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 */

fs/btrfs/extent-tree.c

+1 −1
Original line number Diff line number Diff line
@@ -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) {

fs/btrfs/volumes.c

+3 −3
Original line number Diff line number Diff line
@@ -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",