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btrfs: implement shutdown ioctl

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The shutdown ioctl should follow the XFS one, which use magic number 'X',
and ioctl number 125, with a uint32 as flags.

For now btrfs don't distinguish DEFAULT and LOGFLUSH flags (just like
f2fs), both will freeze the fs first (implies committing the current
transaction), setting the SHUTDOWN flag and finally thaw the fs.

For NOLOGFLUSH flag, the freeze/thaw part is skipped thus the current
transaction is aborted.

The new shutdown ioctl is hidden behind experimental features for more
testing.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Anand Jain <asj@kernel.org>
Tested-by: Anand Jain <asj@kernel.org>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
2025-10-13 10:22:04 +10:30
committed by David Sterba
parent 9b2839451d
commit 6b1ac78dd0
2 changed files with 50 additions and 0 deletions
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9
include/uapi/linux/btrfs.h
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@@ -1099,6 +1099,12 @@ enum btrfs_err_code {
BTRFS_ERROR_DEV_RAID1C4_MIN_NOT_MET,
};
/* Flags for IOC_SHUTDOWN, must match XFS_FSOP_GOING_FLAGS_* flags. */
#define BTRFS_SHUTDOWN_FLAGS_DEFAULT 0x0
#define BTRFS_SHUTDOWN_FLAGS_LOGFLUSH 0x1
#define BTRFS_SHUTDOWN_FLAGS_NOLOGFLUSH 0x2
#define BTRFS_SHUTDOWN_FLAGS_LAST 0x3
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -1220,6 +1226,9 @@ enum btrfs_err_code {
#define BTRFS_IOC_SUBVOL_SYNC_WAIT _IOW(BTRFS_IOCTL_MAGIC, 65, \
struct btrfs_ioctl_subvol_wait)
/* Shutdown ioctl should follow XFS's interfaces, thus not using btrfs magic. */
#define BTRFS_IOC_SHUTDOWN _IOR('X', 125, __u32)
#ifdef __cplusplus
}
#endif