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-rw-r--r--fs/locks.c50
-rw-r--r--fs/namespace.c2
-rw-r--r--fs/open.c2
-rw-r--r--fs/overlayfs/super.c2
-rw-r--r--include/linux/fs.h16
-rw-r--r--include/uapi/linux/fs.h1
6 files changed, 46 insertions, 27 deletions
diff --git a/fs/locks.c b/fs/locks.c
index ee1b15f6fc13..c1656cff53ee 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -139,6 +139,11 @@
#define IS_LEASE(fl) (fl->fl_flags & (FL_LEASE|FL_DELEG|FL_LAYOUT))
#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
+static inline bool is_remote_lock(struct file *filp)
+{
+ return likely(!(filp->f_path.dentry->d_sb->s_flags & MS_NOREMOTELOCK));
+}
+
static bool lease_breaking(struct file_lock *fl)
{
return fl->fl_flags & (FL_UNLOCK_PENDING | FL_DOWNGRADE_PENDING);
@@ -791,7 +796,7 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
{
struct file_lock *cfl;
struct file_lock_context *ctx;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx || list_empty_careful(&ctx->flc_posix)) {
@@ -1192,7 +1197,7 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request,
int posix_lock_file(struct file *filp, struct file_lock *fl,
struct file_lock *conflock)
{
- return posix_lock_inode(file_inode(filp), fl, conflock);
+ return posix_lock_inode(locks_inode(filp), fl, conflock);
}
EXPORT_SYMBOL(posix_lock_file);
@@ -1232,7 +1237,7 @@ static int posix_lock_inode_wait(struct inode *inode, struct file_lock *fl)
int locks_mandatory_locked(struct file *file)
{
int ret;
- struct inode *inode = file_inode(file);
+ struct inode *inode = locks_inode(file);
struct file_lock_context *ctx;
struct file_lock *fl;
@@ -1572,7 +1577,7 @@ EXPORT_SYMBOL(lease_get_mtime);
int fcntl_getlease(struct file *filp)
{
struct file_lock *fl;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
struct file_lock_context *ctx;
int type = F_UNLCK;
LIST_HEAD(dispose);
@@ -1580,7 +1585,7 @@ int fcntl_getlease(struct file *filp)
ctx = smp_load_acquire(&inode->i_flctx);
if (ctx && !list_empty_careful(&ctx->flc_lease)) {
spin_lock(&ctx->flc_lock);
- time_out_leases(file_inode(filp), &dispose);
+ time_out_leases(inode, &dispose);
list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
if (fl->fl_file != filp)
continue;
@@ -1628,7 +1633,7 @@ generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **pr
{
struct file_lock *fl, *my_fl = NULL, *lease;
struct dentry *dentry = filp->f_path.dentry;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = dentry->d_inode;
struct file_lock_context *ctx;
bool is_deleg = (*flp)->fl_flags & FL_DELEG;
int error;
@@ -1742,7 +1747,7 @@ static int generic_delete_lease(struct file *filp, void *owner)
{
int error = -EAGAIN;
struct file_lock *fl, *victim = NULL;
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
struct file_lock_context *ctx;
LIST_HEAD(dispose);
@@ -1782,7 +1787,7 @@ static int generic_delete_lease(struct file *filp, void *owner)
int generic_setlease(struct file *filp, long arg, struct file_lock **flp,
void **priv)
{
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
int error;
if ((!uid_eq(current_fsuid(), inode->i_uid)) && !capable(CAP_LEASE))
@@ -1830,7 +1835,7 @@ EXPORT_SYMBOL(generic_setlease);
int
vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
{
- if (filp->f_op->setlease)
+ if (filp->f_op->setlease && is_remote_lock(filp))
return filp->f_op->setlease(filp, arg, lease, priv);
else
return generic_setlease(filp, arg, lease, priv);
@@ -1979,7 +1984,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
if (error)
goto out_free;
- if (f.file->f_op->flock)
+ if (f.file->f_op->flock && is_remote_lock(f.file))
error = f.file->f_op->flock(f.file,
(can_sleep) ? F_SETLKW : F_SETLK,
lock);
@@ -2005,7 +2010,7 @@ 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)
+ if (filp->f_op->lock && is_remote_lock(filp))
return filp->f_op->lock(filp, F_GETLK, fl);
posix_test_lock(filp, fl);
return 0;
@@ -2129,7 +2134,7 @@ out:
*/
int vfs_lock_file(struct file *filp, unsigned int cmd, struct file_lock *fl, struct file_lock *conf)
{
- if (filp->f_op->lock)
+ if (filp->f_op->lock && is_remote_lock(filp))
return filp->f_op->lock(filp, cmd, fl);
else
return posix_lock_file(filp, fl, conf);
@@ -2191,7 +2196,7 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
if (file_lock == NULL)
return -ENOLCK;
- inode = file_inode(filp);
+ inode = locks_inode(filp);
/*
* This might block, so we do it before checking the inode.
@@ -2343,7 +2348,7 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
if (copy_from_user(&flock, l, sizeof(flock)))
goto out;
- inode = file_inode(filp);
+ inode = locks_inode(filp);
/* Don't allow mandatory locks on files that may be memory mapped
* and shared.
@@ -2426,6 +2431,7 @@ out:
void locks_remove_posix(struct file *filp, fl_owner_t owner)
{
int error;
+ struct inode *inode = locks_inode(filp);
struct file_lock lock;
struct file_lock_context *ctx;
@@ -2434,7 +2440,7 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
* posix_lock_file(). Another process could be setting a lock on this
* file at the same time, but we wouldn't remove that lock anyway.
*/
- ctx = smp_load_acquire(&file_inode(filp)->i_flctx);
+ ctx = smp_load_acquire(&inode->i_flctx);
if (!ctx || list_empty(&ctx->flc_posix))
return;
@@ -2452,7 +2458,7 @@ void locks_remove_posix(struct file *filp, fl_owner_t owner)
if (lock.fl_ops && lock.fl_ops->fl_release_private)
lock.fl_ops->fl_release_private(&lock);
- trace_locks_remove_posix(file_inode(filp), &lock, error);
+ trace_locks_remove_posix(inode, &lock, error);
}
EXPORT_SYMBOL(locks_remove_posix);
@@ -2469,12 +2475,12 @@ locks_remove_flock(struct file *filp, struct file_lock_context *flctx)
.fl_type = F_UNLCK,
.fl_end = OFFSET_MAX,
};
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
if (list_empty(&flctx->flc_flock))
return;
- if (filp->f_op->flock)
+ if (filp->f_op->flock && is_remote_lock(filp))
filp->f_op->flock(filp, F_SETLKW, &fl);
else
flock_lock_inode(inode, &fl);
@@ -2508,7 +2514,7 @@ void locks_remove_file(struct file *filp)
{
struct file_lock_context *ctx;
- ctx = smp_load_acquire(&file_inode(filp)->i_flctx);
+ ctx = smp_load_acquire(&locks_inode(filp)->i_flctx);
if (!ctx)
return;
@@ -2552,7 +2558,7 @@ EXPORT_SYMBOL(posix_unblock_lock);
*/
int vfs_cancel_lock(struct file *filp, struct file_lock *fl)
{
- if (filp->f_op->lock)
+ if (filp->f_op->lock && is_remote_lock(filp))
return filp->f_op->lock(filp, F_CANCELLK, fl);
return 0;
}
@@ -2580,7 +2586,7 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
fl_pid = fl->fl_pid;
if (fl->fl_file != NULL)
- inode = file_inode(fl->fl_file);
+ inode = locks_inode(fl->fl_file);
seq_printf(f, "%lld:%s ", id, pfx);
if (IS_POSIX(fl)) {
@@ -2682,7 +2688,7 @@ static void __show_fd_locks(struct seq_file *f,
void show_fd_locks(struct seq_file *f,
struct file *filp, struct files_struct *files)
{
- struct inode *inode = file_inode(filp);
+ struct inode *inode = locks_inode(filp);
struct file_lock_context *ctx;
int id = 0;
diff --git a/fs/namespace.c b/fs/namespace.c
index 7bb2cda3bfef..dcd9afe21e62 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2700,7 +2700,7 @@ long do_mount(const char *dev_name, const char __user *dir_name,
flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE | MS_BORN |
MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT |
- MS_STRICTATIME);
+ MS_STRICTATIME | MS_NOREMOTELOCK);
if (flags & MS_REMOUNT)
retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags,
diff --git a/fs/open.c b/fs/open.c
index 4fd6e256f4f4..648fb9d3e97a 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -726,7 +726,7 @@ static int do_dentry_open(struct file *f,
if (error)
goto cleanup_all;
- error = break_lease(inode, f->f_flags);
+ error = break_lease(locks_inode(f), f->f_flags);
if (error)
goto cleanup_all;
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e2a94a26767b..3d0b9dee2b76 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1320,7 +1320,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_xattr = ovl_xattr_handlers;
sb->s_root = root_dentry;
sb->s_fs_info = ufs;
- sb->s_flags |= MS_POSIXACL;
+ sb->s_flags |= MS_POSIXACL | MS_NOREMOTELOCK;
return 0;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7db097d673a8..8ee0f011547f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1065,6 +1065,18 @@ 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;
+}
+
#ifdef CONFIG_FILE_LOCKING
extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *);
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
@@ -1252,7 +1264,7 @@ static inline struct dentry *file_dentry(const struct file *file)
static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
{
- return locks_lock_inode_wait(file_inode(filp), fl);
+ return locks_lock_inode_wait(locks_inode(filp), fl);
}
struct fasync_struct {
@@ -2155,7 +2167,7 @@ static inline int mandatory_lock(struct inode *ino)
static inline int locks_verify_locked(struct file *file)
{
- if (mandatory_lock(file_inode(file)))
+ if (mandatory_lock(locks_inode(file)))
return locks_mandatory_locked(file);
return 0;
}
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 3b00f7c8943f..2473272169f2 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -132,6 +132,7 @@ struct inodes_stat_t {
#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
/* These sb flags are internal to the kernel */
+#define MS_NOREMOTELOCK (1<<27)
#define MS_NOSEC (1<<28)
#define MS_BORN (1<<29)
#define MS_ACTIVE (1<<30)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 16:11:05 +0000