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authorChristoph Hellwig <hch@infradead.org>2011-05-27 17:28:01 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-05-27 17:43:00 +0400
commit4b4563dc80594c6a2580aa52d9fcf0177a27074e (patch)
tree1930ae6b71c7d69c7072e05cc2e2c55fb83547f4 /fs/inode.c
parentc642808454ac81d6a6701da6022e93bbe47bb38b (diff)
downloadlinux-4b4563dc80594c6a2580aa52d9fcf0177a27074e.tar.xz
fs: cosmetic inode.c cleanups
Move the lock order description after all the includes, remove several fairly outdated and/or incorrect comments, move Andrea's copyright/changelog to the top where it belongs, remove the pointless filename in the top of the file comment, and remove to useless macros. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c54
1 files changed, 5 insertions, 49 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 990d284877a1..0f7e88a7803f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1,9 +1,7 @@
/*
- * linux/fs/inode.c
- *
* (C) 1997 Linus Torvalds
+ * (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation)
*/
-
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/dcache.h>
@@ -27,10 +25,11 @@
#include <linux/prefetch.h>
#include <linux/ima.h>
#include <linux/cred.h>
+#include <linux/buffer_head.h> /* for inode_has_buffers */
#include "internal.h"
/*
- * inode locking rules.
+ * Inode locking rules:
*
* inode->i_lock protects:
* inode->i_state, inode->i_hash, __iget()
@@ -60,54 +59,11 @@
* inode_hash_lock
*/
-/*
- * This is needed for the following functions:
- * - inode_has_buffers
- * - invalidate_bdev
- *
- * FIXME: remove all knowledge of the buffer layer from this file
- */
-#include <linux/buffer_head.h>
-
-/*
- * New inode.c implementation.
- *
- * This implementation has the basic premise of trying
- * to be extremely low-overhead and SMP-safe, yet be
- * simple enough to be "obviously correct".
- *
- * Famous last words.
- */
-
-/* inode dynamic allocation 1999, Andrea Arcangeli <andrea@suse.de> */
-
-/* #define INODE_PARANOIA 1 */
-/* #define INODE_DEBUG 1 */
-
-/*
- * Inode lookup is no longer as critical as it used to be:
- * most of the lookups are going to be through the dcache.
- */
-#define I_HASHBITS i_hash_shift
-#define I_HASHMASK i_hash_mask
-
static unsigned int i_hash_mask __read_mostly;
static unsigned int i_hash_shift __read_mostly;
static struct hlist_head *inode_hashtable __read_mostly;
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
-/*
- * Each inode can be on two separate lists. One is
- * the hash list of the inode, used for lookups. The
- * other linked list is the "type" list:
- * "in_use" - valid inode, i_count > 0, i_nlink > 0
- * "dirty" - as "in_use" but also dirty
- * "unused" - valid inode, i_count = 0
- *
- * A "dirty" list is maintained for each super block,
- * allowing for low-overhead inode sync() operations.
- */
-
static LIST_HEAD(inode_lru);
static DEFINE_SPINLOCK(inode_lru_lock);
@@ -424,8 +380,8 @@ static unsigned long hash(struct super_block *sb, unsigned long hashval)
tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
L1_CACHE_BYTES;
- tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS);
- return tmp & I_HASHMASK;
+ tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift);
+ return tmp & i_hash_mask;
}
/**