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btrfs: introduce pending action: commit 

In some contexts, like in sysfs handlers, we don't want to trigger a
transaction commit. It's a heavy operation, we don't know what external
locks may be taken. Instead, make it possible to finish the operation
through sync syscall or SYNC_FS ioctl.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2014-11-12 14:24:35 +01:00
parent 7e1876aca8
commit d51033d055
2 changed files with 6 additions and 0 deletions
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1
fs/btrfs/ctree.h
View File

@ -2132,6 +2132,7 @@ struct btrfs_ioctl_defrag_range_args {
#define BTRFS_PENDING_SET_INODE_MAP_CACHE (0)
#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1)
#define BTRFS_PENDING_COMMIT (2)
#define btrfs_test_pending(info, opt) \
test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)

5
fs/btrfs/transaction.c
View File

@ -2036,6 +2036,11 @@ void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info)
btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);
prev &= ~bit;
bit = 1 << BTRFS_PENDING_COMMIT;
if (prev & bit)
btrfs_debug(fs_info, "pending commit done");
prev &= ~bit;
if (prev)
btrfs_warn(fs_info,
"unknown pending changes left 0x%lx, ignoring", prev);