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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-02 22:41:01 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-11-02 22:41:01 +0400 |
| commit | d211858837ff8d8e31942ca7d27e6e08b3b46f5e (patch) | |
| tree | a8ec83a791066e64ad02052498dbe39ebefacab9 /include/linux/fs.h | |
| parent | f1f8935a5c38a2c61e86a42bc971a2539eef2211 (diff) | |
| parent | f0023bc617ba600956b9226f1806033d7486c8ba (diff) | |
| download | linux-d211858837ff8d8e31942ca7d27e6e08b3b46f5e.tar.xz | |
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/vfs-queue:
vfs: add d_prune dentry operation
vfs: protect i_nlink
filesystems: add set_nlink()
filesystems: add missing nlink wrappers
logfs: remove unnecessary nlink setting
ocfs2: remove unnecessary nlink setting
jfs: remove unnecessary nlink setting
hypfs: remove unnecessary nlink setting
vfs: ignore error on forced remount
readlinkat: ensure we return ENOENT for the empty pathname for normal lookups
vfs: fix dentry leak in simple_fill_super()
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 78af9385f415..0c4df261af7e 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -768,7 +768,17 @@ struct inode { /* Stat data, not accessed from path walking */ unsigned long i_ino; - unsigned int i_nlink; + /* + * Filesystems may only read i_nlink directly. They shall use the + * following functions for modification: + * + * (set|clear|inc|drop)_nlink + * inode_(inc|dec)_link_count + */ + union { + const unsigned int i_nlink; + unsigned int __i_nlink; + }; dev_t i_rdev; struct timespec i_atime; struct timespec i_mtime; @@ -1755,6 +1765,19 @@ static inline void mark_inode_dirty_sync(struct inode *inode) } /** + * set_nlink - directly set an inode's link count + * @inode: inode + * @nlink: new nlink (should be non-zero) + * + * This is a low-level filesystem helper to replace any + * direct filesystem manipulation of i_nlink. + */ +static inline void set_nlink(struct inode *inode, unsigned int nlink) +{ + inode->__i_nlink = nlink; +} + +/** * inc_nlink - directly increment an inode's link count * @inode: inode * @@ -1764,7 +1787,7 @@ static inline void mark_inode_dirty_sync(struct inode *inode) */ static inline void inc_nlink(struct inode *inode) { - inode->i_nlink++; + inode->__i_nlink++; } static inline void inode_inc_link_count(struct inode *inode) @@ -1786,7 +1809,7 @@ static inline void inode_inc_link_count(struct inode *inode) */ static inline void drop_nlink(struct inode *inode) { - inode->i_nlink--; + inode->__i_nlink--; } /** @@ -1799,7 +1822,7 @@ static inline void drop_nlink(struct inode *inode) */ static inline void clear_nlink(struct inode *inode) { - inode->i_nlink = 0; + inode->__i_nlink = 0; } static inline void inode_dec_link_count(struct inode *inode) |