diff options
author | J. Bruce Fields <bfields@redhat.com> | 2012-08-28 07:50:40 -0700 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-11-09 00:16:42 -0500 |
commit | 5a14696c1795d3843673b5cf1982d0e5357a5bbf (patch) | |
tree | 8d0ec4f82f90fc5f3e50cfc8cdd78ee7a4fb2263 /include/linux/fs.h | |
parent | b21996e36c8e3b92a84e972378bde80b43acd890 (diff) | |
download | linux-stable-5a14696c1795d3843673b5cf1982d0e5357a5bbf.tar.gz linux-stable-5a14696c1795d3843673b5cf1982d0e5357a5bbf.tar.bz2 linux-stable-5a14696c1795d3843673b5cf1982d0e5357a5bbf.zip |
locks: helper functions for delegation breaking
We'll need the same logic for rename and link.
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r-- | include/linux/fs.h | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index a5799233142a..931f919f44e1 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1905,6 +1905,9 @@ extern bool fs_fully_visible(struct file_system_type *); extern int current_umask(void); +extern void ihold(struct inode * inode); +extern void iput(struct inode *); + /* /sys/fs */ extern struct kobject *fs_kobj; @@ -1972,6 +1975,28 @@ static inline int break_deleg(struct inode *inode, unsigned int mode) return 0; } +static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) +{ + int ret; + + ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); + if (ret == -EWOULDBLOCK && delegated_inode) { + *delegated_inode = inode; + ihold(inode); + } + return ret; +} + +static inline int break_deleg_wait(struct inode **delegated_inode) +{ + int ret; + + ret = break_deleg(*delegated_inode, O_WRONLY); + iput(*delegated_inode); + *delegated_inode = NULL; + return ret; +} + #else /* !CONFIG_FILE_LOCKING */ static inline int locks_mandatory_locked(struct inode *inode) { @@ -2015,6 +2040,18 @@ static inline int break_deleg(struct inode *inode, unsigned int mode) { return 0; } + +static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) +{ + return 0; +} + +static inline int break_deleg_wait(struct inode **delegated_inode) +{ + BUG(); + return 0; +} + #endif /* CONFIG_FILE_LOCKING */ /* fs/open.c */ @@ -2350,8 +2387,6 @@ extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); extern int inode_init_always(struct super_block *, struct inode *); extern void inode_init_once(struct inode *); extern void address_space_init_once(struct address_space *mapping); -extern void ihold(struct inode * inode); -extern void iput(struct inode *); extern struct inode * igrab(struct inode *); extern ino_t iunique(struct super_block *, ino_t); extern int inode_needs_sync(struct inode *inode); |