document nlink function (71c42157) · Commits · 戴 / test

include/linux/fs.h

+27 −0

Original line number	Diff line number	Diff line
		@@ -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;