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>
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@ -2132,6 +2132,7 @@ struct btrfs_ioctl_defrag_range_args {
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#define BTRFS_PENDING_SET_INODE_MAP_CACHE (0)
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#define BTRFS_PENDING_SET_INODE_MAP_CACHE (0)
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#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1)
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#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1)
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#define BTRFS_PENDING_COMMIT (2)
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#define btrfs_test_pending(info, opt) \
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#define btrfs_test_pending(info, opt) \
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test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
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test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
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@ -2036,6 +2036,11 @@ void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info)
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btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);
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btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE);
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prev &= ~bit;
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prev &= ~bit;
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bit = 1 << BTRFS_PENDING_COMMIT;
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if (prev & bit)
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btrfs_debug(fs_info, "pending commit done");
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prev &= ~bit;
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if (prev)
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if (prev)
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btrfs_warn(fs_info,
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btrfs_warn(fs_info,
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"unknown pending changes left 0x%lx, ignoring", prev);
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"unknown pending changes left 0x%lx, ignoring", prev);
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