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btrfs: factor btrfs_check_rw_degradable() to check given device

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Update btrfs_check_rw_degradable() to check against the given device if
its lost.

We can use this function to know if the volume is going to be in
degraded mode OR failed state, when the given device fails.  Which is
needed when we are handling the device failed state.

A preparatory patch does not affect the flow as such.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
[ enhance comment ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2017-12-18 17:08:59 +08:00 • committed by David Sterba
parent e43bbe5e16
commit 6528b99d3d
4 changed files with 13 additions and 7 deletions
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4
fs/btrfs/disk-io.c
View file

@ -2866,7 +2866,7 @@ retry_root_backup:
goto fail_sysfs;
}
if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info)) {
if (!sb_rdonly(sb) && !btrfs_check_rw_degradable(fs_info, NULL)) {
btrfs_warn(fs_info,
"writeable mount is not allowed due to too many missing devices");
goto fail_sysfs;
@ -3369,7 +3369,7 @@ static blk_status_t wait_dev_flush(struct btrfs_device *device)
static int check_barrier_error(struct btrfs_fs_info *fs_info)
{
if (!btrfs_check_rw_degradable(fs_info))
if (!btrfs_check_rw_degradable(fs_info, NULL))
return -EIO;
return 0;
}