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-rw-r--r--fs/super.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/fs/super.c b/fs/super.c
index 993ca8f128d6..6acc02237e3e 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -723,23 +723,33 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
/* If we are remounting RDONLY and current sb is read/write,
make sure there are no rw files opened */
if (remount_ro) {
- if (force)
+ if (force) {
mark_files_ro(sb);
- else if (!fs_may_remount_ro(sb))
- return -EBUSY;
+ } else {
+ retval = sb_prepare_remount_readonly(sb);
+ if (retval)
+ return retval;
+
+ retval = -EBUSY;
+ if (!fs_may_remount_ro(sb))
+ goto cancel_readonly;
+ }
}
if (sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
if (retval) {
if (!force)
- return retval;
+ goto cancel_readonly;
/* If forced remount, go ahead despite any errors */
WARN(1, "forced remount of a %s fs returned %i\n",
sb->s_type->name, retval);
}
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
+ /* Needs to be ordered wrt mnt_is_readonly() */
+ smp_wmb();
+ sb->s_readonly_remount = 0;
/*
* Some filesystems modify their metadata via some other path than the
@@ -752,6 +762,10 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
if (remount_ro && sb->s_bdev)
invalidate_bdev(sb->s_bdev);
return 0;
+
+cancel_readonly:
+ sb->s_readonly_remount = 0;
+ return retval;
}
static void do_emergency_remount(struct work_struct *work)