diff options
| author | J. Bruce Fields <bfields@redhat.com> | 2012-08-28 18:50:40 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-11-09 09:16:42 +0400 |
| commit | 5a14696c1795d3843673b5cf1982d0e5357a5bbf (patch) | |
| tree | 8d0ec4f82f90fc5f3e50cfc8cdd78ee7a4fb2263 | |
| parent | b21996e36c8e3b92a84e972378bde80b43acd890 (diff) | |
| download | linux-5a14696c1795d3843673b5cf1982d0e5357a5bbf.tar.xz | |
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>
| -rw-r--r-- | fs/namei.c | 13 | ||||
| -rw-r--r-- | include/linux/fs.h | 39 |
2 files changed, 40 insertions, 12 deletions
diff --git a/fs/namei.c b/fs/namei.c index 67ce331a3ed8..cfaeaae0f2db 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3650,14 +3650,9 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry, struct inode **delegate else { error = security_inode_unlink(dir, dentry); if (!error) { - error = break_deleg(target, O_WRONLY|O_NONBLOCK); - if (error) { - if (error == -EWOULDBLOCK && delegated_inode) { - *delegated_inode = target; - ihold(target); - } + error = try_break_deleg(target, delegated_inode); + if (error) goto out; - } error = dir->i_op->unlink(dir, dentry); if (!error) dont_mount(dentry); @@ -3727,9 +3722,7 @@ exit2: iput(inode); /* truncate the inode here */ inode = NULL; if (delegated_inode) { - error = break_deleg(delegated_inode, O_WRONLY); - iput(delegated_inode); - delegated_inode = NULL; + error = break_deleg_wait(&delegated_inode); if (!error) goto retry_deleg; } 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); |