[CHANGELOG] v2: - Enhance and rename shutdown() callback Rename it to remove_bdev() and add a @bdev parameter. For the existing call backs in filesystems, keep their callback function names, now something like ".remove_bdev = ext4_shutdown," will be a quick indicator of the behavior. - Remove the @surprise parameter for the remove_bdev() parameter. The fs_bdev_mark_dead() is already trying to sync the fs if it's not a surprise removal. So there isn't much a filesystem can do with the @surprise parameter. - Fix btrfs error handling when the devices are not opened There are several cases that the fs_devices is not opened, including: * sget_fc() failure * an existing super block is returned * a new super block is returned but btrfS_open_fs_devices() failed Handle the error properly so that fs_devices is not freed twice. RFC->v1: - Add a new remove_bdev() callback Thanks all the feedback from Christian, Christoph and Jan on this new name. - Add a @surprise parameter to the remove_bdev() callback To keep it the same as the bdev_mark_dead(). - Hide the shutdown ioctl and remove_bdev callback behind experimental With the shutdown ioctl, there are at least 2 test failures (g/388, g/508). G/388 is related to the error handling with COW fixup. G/508 looks like something related to log replay. And the remove_bdev() doesn't have any btrfs specific test case yet to check the auto-degraded behavior, nor the auto-degraded behavior is fully discussed. So hide both of them behind experimental features. - Do not use btrfs_handle_fs_error() to avoid freeze/thaw behavior change btrfs_handle_fs_error() will flips the fs read-only, which will affect freeze/thaw behavior. And no other fs set the fs read-only when shutting down, so follow the other fs to have a more consistent behavior. Qu Wenruo (6): fs: enhance and rename shutdown() callback to remove_bdev() btrfs: introduce a new fs state, EMERGENCY_SHUTDOWN btrfs: reject file operations if in shutdown state btrfs: reject delalloc ranges if in shutdown state btrfs: implement shutdown ioctl btrfs: implement remove_bdev super operation callback fs/btrfs/file.c | 25 ++++++++++++++++++++- fs/btrfs/fs.h | 28 ++++++++++++++++++++++++ fs/btrfs/inode.c | 14 +++++++++++- fs/btrfs/ioctl.c | 43 ++++++++++++++++++++++++++++++++++++ fs/btrfs/messages.c | 1 + fs/btrfs/reflink.c | 3 +++ fs/btrfs/super.c | 45 ++++++++++++++++++++++++++++++++++++++ fs/btrfs/volumes.c | 2 ++ fs/btrfs/volumes.h | 5 +++++ fs/exfat/super.c | 4 ++-- fs/ext4/super.c | 4 ++-- fs/f2fs/super.c | 4 ++-- fs/ntfs3/super.c | 4 ++-- fs/super.c | 4 ++-- fs/xfs/xfs_super.c | 5 +++-- include/linux/fs.h | 7 +++++- include/uapi/linux/btrfs.h | 9 ++++++++ 17 files changed, 192 insertions(+), 15 deletions(-) -- 2.50.0
