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authorDave Hansen <haveblue@us.ibm.com>2007-06-24 00:16:42 (GMT)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-24 15:59:11 (GMT)
commit71c42157904404a37f89fff3b2536c55115823a5 (patch)
tree477793f825fa8777640ad4e9b705ccb98b83d18d /include
parent0faa45480261a52323fe88bfab6aea1e8eb87b65 (diff)
document nlink function
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index b3ae77c..6a41f4c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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;

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