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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fairly outdated and/or incorrect comments, move Andrea's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>
This commit is contained in:
Christoph Hellwig 2011-05-27 09:28:01 -04:00 committed by Al Viro
parent c642808454
commit 4b4563dc80
1 changed files with 5 additions and 49 deletions
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54
fs/inode.c
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@ -1,9 +1,7 @@
/* /*
* linux/fs/inode.c
*
* (C) 1997 Linus Torvalds * (C) 1997 Linus Torvalds
* (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation)
*/ */
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/dcache.h> #include <linux/dcache.h>
@ -27,10 +25,11 @@
#include <linux/prefetch.h> #include <linux/prefetch.h>
#include <linux/ima.h> #include <linux/ima.h>
#include <linux/cred.h> #include <linux/cred.h>
#include <linux/buffer_head.h> /* for inode_has_buffers */
#include "internal.h" #include "internal.h"
/* /*
* inode locking rules. * Inode locking rules:
* *
* inode->i_lock protects: * inode->i_lock protects:
* inode->i_state, inode->i_hash, __iget() * inode->i_state, inode->i_hash, __iget()
@ -60,54 +59,11 @@
* inode_hash_lock * 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_mask __read_mostly;
static unsigned int i_hash_shift __read_mostly; static unsigned int i_hash_shift __read_mostly;
static struct hlist_head *inode_hashtable __read_mostly; static struct hlist_head *inode_hashtable __read_mostly;
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); 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 LIST_HEAD(inode_lru);
static DEFINE_SPINLOCK(inode_lru_lock); 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) / tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
L1_CACHE_BYTES; L1_CACHE_BYTES;
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS); tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift);
return tmp & I_HASHMASK; return tmp & i_hash_mask;
} }
/** /**