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-rw-r--r--fs/internal.h1
-rw-r--r--fs/namespace.c40
-rw-r--r--fs/super.c22
3 files changed, 58 insertions, 5 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 2523a402945..9962c59ba28 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -52,6 +52,7 @@ extern int finish_automount(struct vfsmount *, struct path *);
extern void mnt_make_longterm(struct vfsmount *);
extern void mnt_make_shortterm(struct vfsmount *);
+extern int sb_prepare_remount_readonly(struct super_block *);
extern void __init mnt_init(void);
diff --git a/fs/namespace.c b/fs/namespace.c
index 145217b088d..98ebc78b21a 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -273,6 +273,15 @@ static unsigned int mnt_get_writers(struct mount *mnt)
#endif
}
+static int mnt_is_readonly(struct vfsmount *mnt)
+{
+ if (mnt->mnt_sb->s_readonly_remount)
+ return 1;
+ /* Order wrt setting s_flags/s_readonly_remount in do_remount() */
+ smp_rmb();
+ return __mnt_is_readonly(mnt);
+}
+
/*
* Most r/o checks on a fs are for operations that take
* discrete amounts of time, like a write() or unlink().
@@ -312,7 +321,7 @@ int mnt_want_write(struct vfsmount *m)
* MNT_WRITE_HOLD is cleared.
*/
smp_rmb();
- if (__mnt_is_readonly(m)) {
+ if (mnt_is_readonly(m)) {
mnt_dec_writers(mnt);
ret = -EROFS;
goto out;
@@ -435,6 +444,35 @@ static void __mnt_unmake_readonly(struct mount *mnt)
br_write_unlock(vfsmount_lock);
}
+int sb_prepare_remount_readonly(struct super_block *sb)
+{
+ struct mount *mnt;
+ int err = 0;
+
+ br_write_lock(vfsmount_lock);
+ list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) {
+ if (!(mnt->mnt.mnt_flags & MNT_READONLY)) {
+ mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
+ smp_mb();
+ if (mnt_get_writers(mnt) > 0) {
+ err = -EBUSY;
+ break;
+ }
+ }
+ }
+ if (!err) {
+ sb->s_readonly_remount = 1;
+ smp_wmb();
+ }
+ list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) {
+ if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
+ mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
+ }
+ br_write_unlock(vfsmount_lock);
+
+ return err;
+}
+
static void free_vfsmnt(struct mount *mnt)
{
kfree(mnt->mnt_devname);
diff --git a/fs/super.c b/fs/super.c
index 993ca8f128d..6acc02237e3 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)