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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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2
fs/btrfs/super.c
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@@ -1844,7 +1844,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
goto restore;
}
if (!btrfs_check_rw_degradable(fs_info)) {
if (!btrfs_check_rw_degradable(fs_info, NULL)) {
btrfs_warn(fs_info,
"too many missing devices, writeable remount is not allowed");
ret = -EACCES;