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Btrfs: Check INCOMPAT flags on remount and add helper function

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In support of the recently added capability to remount with lzo
compression, provide a helper function to check the compression
INCOMPAT flags when remounting with lzo compression, and set
the flags if necessary.

Also, implement the new helper function when defragmenting with
explicit lzo compression and when setting the default subvolume.

Signed-off-by: Mitch Harder <mitch.harder@sabayonlinux.org>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Mitch Harder
2012-07-24 11:58:43 -06:00
committed by Chris Mason
parent b478b2baa3
commit 2b0ce2c290
3 changed files with 20 additions and 14 deletions
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17
fs/btrfs/ctree.h
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@@ -3288,6 +3288,23 @@ void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *function,
unsigned int line, int errno);
#define btrfs_set_fs_incompat(__fs_info, opt) \
__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
u64 flag)
{
struct btrfs_super_block *disk_super;
u64 features;
disk_super = fs_info->super_copy;
features = btrfs_super_incompat_flags(disk_super);
if (!(features & flag)) {
features |= flag;
btrfs_set_super_incompat_flags(disk_super, features);
}
}
#define btrfs_abort_transaction(trans, root, errno) \
do { \
__btrfs_abort_transaction(trans, root, __func__, \