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Make statfs properly return read-only state after emergency remount

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Emergency remount (sysrq-u) sets MS_RDONLY to the superblock but doesn't set
MNT_READONLY to the mount point.

Once calculate_f_flags() only check for the mount point read only state,
when setting kstatfs flags, after an emergency remount, statfs does not
report the filesystem as read-only, even though it is.

Enable flags_by_sb() to also check for superblock read only state, so the
kstatfs and consequently statfs can properly show the read-only state of
the filesystem.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Carlos Maiolino 2017-06-29 11:25:40 +02:00 committed by Al Viro
parent 6916363f30
commit a8e2b63677
1 changed files with 2 additions and 0 deletions
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2
fs/statfs.c
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@ -38,6 +38,8 @@ static int flags_by_sb(int s_flags)
flags |= ST_SYNCHRONOUS; flags |= ST_SYNCHRONOUS;
if (s_flags & MS_MANDLOCK) if (s_flags & MS_MANDLOCK)
flags |= ST_MANDLOCK; flags |= ST_MANDLOCK;
if (s_flags & MS_RDONLY)
flags |= ST_RDONLY;
return flags; return flags;
} }