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authorMiklos Szeredi <mszeredi@redhat.com>2018-07-18 15:44:43 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-18 15:44:43 +0200
commitde2a4a501e716bbf5ff691ba16faf59a35320228 (patch)
tree92a505a3870fce449fab03cba16631c7cb867dc7
parent8cf9ee5061037accf61775f438ad7513576d4413 (diff)
Partially revert "locks: fix file locking on overlayfs"
This partially reverts commit c568d68341be7030f5647def68851e469b21ca11. Overlayfs files will now automatically get the correct locks, no need to hack overlay support in VFS. It is a partial revert, because it leaves the locks_inode() calls in place and defines locks_inode() to file_inode(). We could revert those as well, but it would be unnecessary code churn and it makes sense to document that we are getting the inode for locking purposes. Don't revert MS_NOREMOTELOCK yet since that has been part of the userspace API for some time (though not in a useful way). Will try to remove internal flags later when the dust around the new mount API settles. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Acked-by: Jeff Layton <jlayton@kernel.org>
-rw-r--r--fs/locks.c17
-rw-r--r--fs/overlayfs/super.c2
-rw-r--r--include/linux/fs.h13
3 files changed, 8 insertions, 24 deletions
diff --git a/fs/locks.c b/fs/locks.c
index baa564841c03..dab4e72f8bff 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -139,11 +139,6 @@
#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
#define IS_REMOTELCK(fl) (fl->fl_pid <= 0)
-static inline bool is_remote_lock(struct file *filp)
-{
- return likely(!(filp->f_path.dentry->d_sb->s_flags & SB_NOREMOTELOCK));
-}
-
static bool lease_breaking(struct file_lock *fl)
{
return fl->fl_flags & (FL_UNLOCK_PENDING | FL_DOWNGRADE_PENDING);
@@ -1875,7 +1870,7 @@ EXPORT_SYMBOL(generic_setlease);
int
vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
{
- if (filp->f_op->setlease && is_remote_lock(filp))
+ if (filp->f_op->setlease)
return filp->f_op->setlease(filp, arg, lease, priv);
else
return generic_setlease(filp, arg, lease, priv);
@@ -2022,7 +2017,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
if (error)
goto out_free;
- if (f.file->f_op->flock && is_remote_lock(f.file))
+ if (f.file->f_op->flock)
error = f.file->f_op->flock(f.file,
(can_sleep) ? F_SETLKW : F_SETLK,
lock);
@@ -2048,7 +2043,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
*/
int vfs_test_lock(struct file *filp, struct file_lock *fl)
{
- if (filp->f_op->lock && is_remote_lock(filp))
+ if (filp->f_op->lock)
return filp->f_op->lock(filp, F_GETLK, fl);
posix_test_lock(filp, fl);
return 0;
@@ -2191,7 +2186,7 @@ out:
*/
int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf)
{
- if (filp->f_op->lock && is_remote_lock(filp))
+ if (filp->f_op->lock)
return filp->f_op->lock(filp, cmd, fl);
else
return posix_lock_file(filp, fl, conf);
@@ -2513,7 +2508,7 @@ locks_remove_flock(struct file *filp, struct file_lock_context *flctx)
if (list_empty(&flctx->flc_flock))
return;
- if (filp->f_op->flock && is_remote_lock(filp))
+ if (filp->f_op->flock)
filp->f_op->flock(filp, F_SETLKW, &fl);
else
flock_lock_inode(inode, &fl);
@@ -2600,7 +2595,7 @@ EXPORT_SYMBOL(posix_unblock_lock);
*/
int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
- if (filp->f_op->lock && is_remote_lock(filp))
+ if (filp->f_op->lock)
return filp->f_op->lock(filp, F_CANCELLK, fl);
return 0;
}
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 5bc261de5041..c63beccad4fc 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1456,7 +1456,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &ovl_super_operations;
sb->s_xattr = ovl_xattr_handlers;
sb->s_fs_info = ofs;
- sb->s_flags |= SB_POSIXACL | SB_NOREMOTELOCK;
+ sb->s_flags |= SB_POSIXACL;
err = -ENOMEM;
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR, 0));
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 16e2741cec3c..1cbcf37c45e1 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1054,17 +1054,7 @@ struct file_lock_context {
extern void send_sigio(struct fown_struct *fown, int fd, int band);
-/*
- * Return the inode to use for locking
- *
- * For overlayfs this should be the overlay inode, not the real inode returned
- * by file_inode(). For any other fs file_inode(filp) and locks_inode(filp) are
- * equal.
- */
-static inline struct inode *locks_inode(const struct file *f)
-{
- return f->f_path.dentry->d_inode;
-}
+#define locks_inode(f) file_inode(f)
#ifdef CONFIG_FILE_LOCKING
extern int fcntl_getlk(struct file *, unsigned int, struct flock *);
@@ -1305,7 +1295,6 @@ extern int send_sigurg(struct fown_struct *fown);
/* These sb flags are internal to the kernel */
#define SB_SUBMOUNT (1<<26)
-#define SB_NOREMOTELOCK (1<<27)
#define SB_NOSEC (1<<28)
#define SB_BORN (1<<29)
#define SB_ACTIVE (1<<30)