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fs: rename inode_lock to inode_hash_lock 

All that remains of the inode_lock is protecting the inode hash list
manipulation and traversals. Rename the inode_lock to
inode_hash_lock to reflect it's actual function.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dave Chinner 2011-03-22 22:23:42 +11:00 committed by Al Viro
parent a66979abad
commit 67a23c4946
6 changed files with 65 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

115
fs/inode.c
View File

@ -39,10 +39,10 @@
* sb->s_inodes, inode->i_sb_list * sb->s_inodes, inode->i_sb_list
* inode_wb_list_lock protects: * inode_wb_list_lock protects:
* bdi->wb.b_{dirty,io,more_io}, inode->i_wb_list * bdi->wb.b_{dirty,io,more_io}, inode->i_wb_list
* inode_hash_lock protects:
* inode_hashtable, inode->i_hash
* *
* Lock ordering: * Lock ordering:
* inode_lock
* inode->i_lock
* *
* inode_sb_list_lock * inode_sb_list_lock
* inode->i_lock * inode->i_lock
@ -50,6 +50,13 @@
* *
* inode_wb_list_lock * inode_wb_list_lock
* inode->i_lock * inode->i_lock
*
* inode_hash_lock
* inode_sb_list_lock
* inode->i_lock
*
* iunique_lock
* inode_hash_lock
*/ */
/* /*
@ -85,6 +92,8 @@
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 __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
/* /*
* Each inode can be on two separate lists. One is * Each inode can be on two separate lists. One is
@ -100,15 +109,6 @@ static unsigned int i_hash_shift __read_mostly;
static LIST_HEAD(inode_lru); static LIST_HEAD(inode_lru);
static DEFINE_SPINLOCK(inode_lru_lock); static DEFINE_SPINLOCK(inode_lru_lock);
static struct hlist_head *inode_hashtable __read_mostly;
/*
* A simple spinlock to protect the list manipulations.
*
* NOTE! You also have to own the lock if you change
* the i_state of an inode while it is in use..
*/
DEFINE_SPINLOCK(inode_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock); __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock); __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock);
@ -433,11 +433,11 @@ void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{ {
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
hlist_add_head(&inode->i_hash, b); hlist_add_head(&inode->i_hash, b);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
} }
EXPORT_SYMBOL(__insert_inode_hash); EXPORT_SYMBOL(__insert_inode_hash);
@ -449,11 +449,11 @@ EXPORT_SYMBOL(__insert_inode_hash);
*/ */
void remove_inode_hash(struct inode *inode) void remove_inode_hash(struct inode *inode)
{ {
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
hlist_del_init(&inode->i_hash); hlist_del_init(&inode->i_hash);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
} }
EXPORT_SYMBOL(remove_inode_hash); EXPORT_SYMBOL(remove_inode_hash);
@ -778,11 +778,15 @@ static struct inode *find_inode(struct super_block *sb,
repeat: repeat:
hlist_for_each_entry(inode, node, head, i_hash) { hlist_for_each_entry(inode, node, head, i_hash) {
if (inode->i_sb != sb)
continue;
if (!test(inode, data))
continue;
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
if (inode->i_sb != sb) {
spin_unlock(&inode->i_lock);
continue;
}
if (!test(inode, data)) {
spin_unlock(&inode->i_lock);
continue;
}
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode); __wait_on_freeing_inode(inode);
goto repeat; goto repeat;
@ -806,11 +810,15 @@ static struct inode *find_inode_fast(struct super_block *sb,
repeat: repeat:
hlist_for_each_entry(inode, node, head, i_hash) { hlist_for_each_entry(inode, node, head, i_hash) {
if (inode->i_ino != ino)
continue;
if (inode->i_sb != sb)
continue;
spin_lock(&inode->i_lock); spin_lock(&inode->i_lock);
if (inode->i_ino != ino) {
spin_unlock(&inode->i_lock);
continue;
}
if (inode->i_sb != sb) {
spin_unlock(&inode->i_lock);
continue;
}
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
__wait_on_freeing_inode(inode); __wait_on_freeing_inode(inode);
goto repeat; goto repeat;
@ -924,7 +932,7 @@ void unlock_new_inode(struct inode *inode)
EXPORT_SYMBOL(unlock_new_inode); EXPORT_SYMBOL(unlock_new_inode);
/* /*
* This is called without the inode lock held.. Be careful. * This is called without the inode hash lock held.. Be careful.
* *
* We no longer cache the sb_flags in i_flags - see fs.h * We no longer cache the sb_flags in i_flags - see fs.h
* -- rmk@arm.uk.linux.org * -- rmk@arm.uk.linux.org
@ -941,7 +949,7 @@ static struct inode *get_new_inode(struct super_block *sb,
if (inode) { if (inode) {
struct inode *old; struct inode *old;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
/* We released the lock, so.. */ /* We released the lock, so.. */
old = find_inode(sb, head, test, data); old = find_inode(sb, head, test, data);
if (!old) { if (!old) {
@ -953,7 +961,7 @@ static struct inode *get_new_inode(struct super_block *sb,
hlist_add_head(&inode->i_hash, head); hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
inode_sb_list_add(inode); inode_sb_list_add(inode);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
/* Return the locked inode with I_NEW set, the /* Return the locked inode with I_NEW set, the
* caller is responsible for filling in the contents * caller is responsible for filling in the contents
@ -966,7 +974,7 @@ static struct inode *get_new_inode(struct super_block *sb,
* us. Use the old inode instead of the one we just * us. Use the old inode instead of the one we just
* allocated. * allocated.
*/ */
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
destroy_inode(inode); destroy_inode(inode);
inode = old; inode = old;
wait_on_inode(inode); wait_on_inode(inode);
@ -974,7 +982,7 @@ static struct inode *get_new_inode(struct super_block *sb,
return inode; return inode;
set_failed: set_failed:
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
destroy_inode(inode); destroy_inode(inode);
return NULL; return NULL;
} }
@ -992,7 +1000,7 @@ static struct inode *get_new_inode_fast(struct super_block *sb,
if (inode) { if (inode) {
struct inode *old; struct inode *old;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
/* We released the lock, so.. */ /* We released the lock, so.. */
old = find_inode_fast(sb, head, ino); old = find_inode_fast(sb, head, ino);
if (!old) { if (!old) {
@ -1002,7 +1010,7 @@ static struct inode *get_new_inode_fast(struct super_block *sb,
hlist_add_head(&inode->i_hash, head); hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
inode_sb_list_add(inode); inode_sb_list_add(inode);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
/* Return the locked inode with I_NEW set, the /* Return the locked inode with I_NEW set, the
* caller is responsible for filling in the contents * caller is responsible for filling in the contents
@ -1015,7 +1023,7 @@ static struct inode *get_new_inode_fast(struct super_block *sb,
* us. Use the old inode instead of the one we just * us. Use the old inode instead of the one we just
* allocated. * allocated.
*/ */
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
destroy_inode(inode); destroy_inode(inode);
inode = old; inode = old;
wait_on_inode(inode); wait_on_inode(inode);
@ -1036,10 +1044,14 @@ static int test_inode_iunique(struct super_block *sb, unsigned long ino)
struct hlist_node *node; struct hlist_node *node;
struct inode *inode; struct inode *inode;
spin_lock(&inode_hash_lock);
hlist_for_each_entry(inode, node, b, i_hash) { hlist_for_each_entry(inode, node, b, i_hash) {
if (inode->i_ino == ino && inode->i_sb == sb) if (inode->i_ino == ino && inode->i_sb == sb) {
spin_unlock(&inode_hash_lock);
return 0; return 0;
}
} }
spin_unlock(&inode_hash_lock);
return 1; return 1;
} }
@ -1069,7 +1081,6 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
static unsigned int counter; static unsigned int counter;
ino_t res; ino_t res;
spin_lock(&inode_lock);
spin_lock(&iunique_lock); spin_lock(&iunique_lock);
do { do {
if (counter <= max_reserved) if (counter <= max_reserved)
@ -1077,7 +1088,6 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
res = counter++; res = counter++;
} while (!test_inode_iunique(sb, res)); } while (!test_inode_iunique(sb, res));
spin_unlock(&iunique_lock); spin_unlock(&iunique_lock);
spin_unlock(&inode_lock);
return res; return res;
} }
@ -1119,7 +1129,7 @@ EXPORT_SYMBOL(igrab);
* *
* Otherwise NULL is returned. * Otherwise NULL is returned.
* *
* Note, @test is called with the inode_lock held, so can't sleep. * Note, @test is called with the inode_hash_lock held, so can't sleep.
*/ */
static struct inode *ifind(struct super_block *sb, static struct inode *ifind(struct super_block *sb,
struct hlist_head *head, int (*test)(struct inode *, void *), struct hlist_head *head, int (*test)(struct inode *, void *),
@ -1127,15 +1137,15 @@ static struct inode *ifind(struct super_block *sb,
{ {
struct inode *inode; struct inode *inode;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
inode = find_inode(sb, head, test, data); inode = find_inode(sb, head, test, data);
if (inode) { if (inode) {
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
if (likely(wait)) if (likely(wait))
wait_on_inode(inode); wait_on_inode(inode);
return inode; return inode;
} }
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
return NULL; return NULL;
} }
@ -1159,14 +1169,14 @@ static struct inode *ifind_fast(struct super_block *sb,
{ {
struct inode *inode; struct inode *inode;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
inode = find_inode_fast(sb, head, ino); inode = find_inode_fast(sb, head, ino);
if (inode) { if (inode) {
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
wait_on_inode(inode); wait_on_inode(inode);
return inode; return inode;
} }
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
return NULL; return NULL;
} }
@ -1189,7 +1199,7 @@ static struct inode *ifind_fast(struct super_block *sb,
* *
* Otherwise NULL is returned. * Otherwise NULL is returned.
* *
* Note, @test is called with the inode_lock held, so can't sleep. * Note, @test is called with the inode_hash_lock held, so can't sleep.
*/ */
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *), void *data) int (*test)(struct inode *, void *), void *data)
@ -1217,7 +1227,7 @@ EXPORT_SYMBOL(ilookup5_nowait);
* *
* Otherwise NULL is returned. * Otherwise NULL is returned.
* *
* Note, @test is called with the inode_lock held, so can't sleep. * Note, @test is called with the inode_hash_lock held, so can't sleep.
*/ */
struct inode *ilookup5(struct super_block *sb, unsigned long hashval, struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *), void *data) int (*test)(struct inode *, void *), void *data)
@ -1268,7 +1278,8 @@ EXPORT_SYMBOL(ilookup);
* inode and this is returned locked, hashed, and with the I_NEW flag set. The * inode and this is returned locked, hashed, and with the I_NEW flag set. The
* file system gets to fill it in before unlocking it via unlock_new_inode(). * file system gets to fill it in before unlocking it via unlock_new_inode().
* *
* Note both @test and @set are called with the inode_lock held, so can't sleep. * Note both @test and @set are called with the inode_hash_lock held, so can't
* sleep.
*/ */
struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *), int (*test)(struct inode *, void *),
@ -1328,7 +1339,7 @@ int insert_inode_locked(struct inode *inode)
while (1) { while (1) {
struct hlist_node *node; struct hlist_node *node;
struct inode *old = NULL; struct inode *old = NULL;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
hlist_for_each_entry(old, node, head, i_hash) { hlist_for_each_entry(old, node, head, i_hash) {
if (old->i_ino != ino) if (old->i_ino != ino)
continue; continue;
@ -1346,12 +1357,12 @@ int insert_inode_locked(struct inode *inode)
inode->i_state |= I_NEW; inode->i_state |= I_NEW;
hlist_add_head(&inode->i_hash, head); hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
return 0; return 0;
} }
__iget(old); __iget(old);
spin_unlock(&old->i_lock); spin_unlock(&old->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
wait_on_inode(old); wait_on_inode(old);
if (unlikely(!inode_unhashed(old))) { if (unlikely(!inode_unhashed(old))) {
iput(old); iput(old);
@ -1372,7 +1383,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
struct hlist_node *node; struct hlist_node *node;
struct inode *old = NULL; struct inode *old = NULL;
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
hlist_for_each_entry(old, node, head, i_hash) { hlist_for_each_entry(old, node, head, i_hash) {
if (old->i_sb != sb) if (old->i_sb != sb)
continue; continue;
@ -1390,12 +1401,12 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
inode->i_state |= I_NEW; inode->i_state |= I_NEW;
hlist_add_head(&inode->i_hash, head); hlist_add_head(&inode->i_hash, head);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
return 0; return 0;
} }
__iget(old); __iget(old);
spin_unlock(&old->i_lock); spin_unlock(&old->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
wait_on_inode(old); wait_on_inode(old);
if (unlikely(!inode_unhashed(old))) { if (unlikely(!inode_unhashed(old))) {
iput(old); iput(old);
@ -1674,10 +1685,10 @@ static void __wait_on_freeing_inode(struct inode *inode)
wq = bit_waitqueue(&inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW);
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
spin_unlock(&inode->i_lock); spin_unlock(&inode->i_lock);
spin_unlock(&inode_lock); spin_unlock(&inode_hash_lock);
schedule(); schedule();
finish_wait(wq, &wait.wait); finish_wait(wq, &wait.wait);
spin_lock(&inode_lock); spin_lock(&inode_hash_lock);
} }
static __initdata unsigned long ihash_entries; static __initdata unsigned long ihash_entries;

1
fs/notify/inode_mark.c
View File

@ -22,7 +22,6 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/writeback.h> /* for inode_lock */
#include <asm/atomic.h> #include <asm/atomic.h>

1
fs/notify/mark.c
View File

@ -91,7 +91,6 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/srcu.h> #include <linux/srcu.h>
#include <linux/writeback.h> /* for inode_lock */
#include <asm/atomic.h> #include <asm/atomic.h>

1
fs/notify/vfsmount_mark.c
View File

@ -23,7 +23,6 @@
#include <linux/mount.h> #include <linux/mount.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/writeback.h> /* for inode_lock */
#include <asm/atomic.h> #include <asm/atomic.h>

4
fs/ntfs/inode.c
View File

@ -54,7 +54,7 @@
* *
* Return 1 if the attributes match and 0 if not. * Return 1 if the attributes match and 0 if not.
* *
* NOTE: This function runs with the inode_lock spin lock held so it is not * NOTE: This function runs with the inode->i_lock spin lock held so it is not
* allowed to sleep. * allowed to sleep.
*/ */
int ntfs_test_inode(struct inode *vi, ntfs_attr *na) int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
@ -98,7 +98,7 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
* *
* Return 0 on success and -errno on error. * Return 0 on success and -errno on error.
* *
* NOTE: This function runs with the inode_lock spin lock held so it is not * NOTE: This function runs with the inode->i_lock spin lock held so it is not
* allowed to sleep. (Hence the GFP_ATOMIC allocation.) * allowed to sleep. (Hence the GFP_ATOMIC allocation.)
*/ */
static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na) static int ntfs_init_locked_inode(struct inode *vi, ntfs_attr *na)

1
include/linux/writeback.h
View File

@ -9,7 +9,6 @@
struct backing_dev_info; struct backing_dev_info;
extern spinlock_t inode_lock;
extern spinlock_t inode_wb_list_lock; extern spinlock_t inode_wb_list_lock;
/* /*