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document nlink function

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These should have been documented from the beginning.  Fix it.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Hansen 2007-06-23 17:16:42 -07:00 committed by Linus Torvalds
parent 0faa454802
commit 71c4215790
1 changed files with 27 additions and 0 deletions
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27
include/linux/fs.h
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@ -1211,6 +1211,14 @@ static inline void mark_inode_dirty_sync(struct inode *inode)
__mark_inode_dirty(inode, I_DIRTY_SYNC);
}
/**
* inc_nlink - directly increment an inode's link count
* @inode: inode
*
* This is a low-level filesystem helper to replace any
* direct filesystem manipulation of i_nlink. Currently,
* it is only here for parity with dec_nlink().
*/
static inline void inc_nlink(struct inode *inode)
{
inode->i_nlink++;
@ -1222,11 +1230,30 @@ static inline void inode_inc_link_count(struct inode *inode)
mark_inode_dirty(inode);
}
/**
* drop_nlink - directly drop an inode's link count
* @inode: inode
*
* This is a low-level filesystem helper to replace any
* direct filesystem manipulation of i_nlink. In cases
* where we are attempting to track writes to the
* filesystem, a decrement to zero means an imminent
* write when the file is truncated and actually unlinked
* on the filesystem.
*/
static inline void drop_nlink(struct inode *inode)
{
inode->i_nlink--;
}
/**
* clear_nlink - directly zero an inode's link count
* @inode: inode
*
* This is a low-level filesystem helper to replace any
* direct filesystem manipulation of i_nlink. See
* drop_nlink() for why we care about i_nlink hitting zero.
*/
static inline void clear_nlink(struct inode *inode)
{
inode->i_nlink = 0;