diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 338e6f758c6..2daccaf4b54 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -833,7 +833,7 @@ static inline struct file *get_file(struct file *f) * * Lockd stuffs a "host" pointer into this. */ -typedef struct files_struct *fl_owner_t; +typedef void *fl_owner_t; struct file_lock_operations { void (*fl_copy_lock)(struct file_lock *, struct file_lock *); @@ -1921,6 +1921,12 @@ static inline int break_lease(struct inode *inode, unsigned int mode) static inline int break_deleg(struct inode *inode, unsigned int mode) { + /* + * Since this check is lockless, we must ensure that any refcounts + * taken are done before checking inode->i_flock. Otherwise, we could + * end up racing with tasks trying to set a new lease on this file. + */ + smp_mb(); if (inode->i_flock) return __break_lease(inode, mode, FL_DELEG); return 0; |