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* [PATCH 0/2] provide fsid in sysfs devinfo
@ 2021-10-19  0:22 Anand Jain
  2021-10-19  0:22 ` [PATCH 1/2] btrfs: sysfs convert scnprintf and snprintf to use sysfs_emit Anand Jain
                   ` (2 more replies)
  0 siblings, 3 replies; 14+ messages in thread
From: Anand Jain @ 2021-10-19  0:22 UTC (permalink / raw)
  To: linux-btrfs, dsterba

btrfs-progs tries to read the fsid from the super-block for a missing
device and, it fails. It needs to find out if the device is a seed
device. It does it by comparing the device's fsid with the fsid of the
mounted filesystem. To help this scenario introduce a new sysfs file to
read the fsid from the kernel.
     /sys/fs/btrfs/<fsid>/devinfo/<devid>/fsid

Patch 1 is a cleanup converts scnprtin()f and snprintf() to sysfs_emit()
Patch 2 introduces the new sysfs interface as above

The other implementation choice is to add another parameter to the
struct btrfs_ioctl_dev_info_args and use BTRFS_IOC_DEV_INFO ioctl. But
then backward kernel compatibility with the newer btrfs-progs is more
complicated. If needed, we can add that too.

Related btrfs-progs patches:
  btrfs-progs: prepare helper device_is_seed
  btrfs-progs: read fsid from the sysfs in device_is_seed

Anand Jain (2):
  btrfs: sysfs convert scnprintf and snprintf to use sysfs_emit
  btrfs: sysfs add devinfo/fsid to retrieve fsid from the device

 fs/btrfs/sysfs.c | 113 +++++++++++++++++++++++++----------------------
 1 file changed, 60 insertions(+), 53 deletions(-)

-- 
2.31.1


^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2021-10-21 16:19 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2021-10-19  0:22 [PATCH 0/2] provide fsid in sysfs devinfo Anand Jain
2021-10-19  0:22 ` [PATCH 1/2] btrfs: sysfs convert scnprintf and snprintf to use sysfs_emit Anand Jain
2021-10-21 13:35   ` [btrfs] 0f80799866: WARNING:at_fs/sysfs/file.c:#sysfs_emit kernel test robot
2021-10-21 15:30     ` Anand Jain
2021-10-21 16:06     ` David Sterba
2021-10-21 16:18       ` Anand Jain
2021-10-21 16:00   ` [PATCH 1/2] btrfs: sysfs convert scnprintf and snprintf to use sysfs_emit David Sterba
2021-10-21 16:15     ` Anand Jain
2021-10-19  0:22 ` [PATCH 2/2] btrfs: sysfs add devinfo/fsid to retrieve fsid from the device Anand Jain
2021-10-20 18:59   ` David Sterba
2021-10-21  4:03     ` Anand Jain
2021-10-21  8:55       ` Anand Jain
2021-10-19 13:57 ` [PATCH 0/2] provide fsid in sysfs devinfo Josef Bacik
2021-10-20  2:26   ` Anand Jain

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