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Subject[PATCH 09/18] fs: Introduce per-bucket inode hash locks
Date
Protect the inode hash with a single lock is not scalable.  Convert
the inode hash to use the new bit-locked hash list implementation
that allows per-bucket locks to be used. This allows us to replace
the global inode_lock with finer grained locking without increasing
the size of the hash table.

Based on a patch originally from Nick Piggin.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/btrfs/inode.c | 2 +-
fs/fs-writeback.c | 2 +-
fs/hfs/hfs_fs.h | 2 +-
fs/hfs/inode.c | 2 +-
fs/hfsplus/hfsplus_fs.h | 2 +-
fs/hfsplus/inode.c | 2 +-
fs/inode.c | 149 ++++++++++++++++++++++++++++------------------
fs/nilfs2/gcinode.c | 22 ++++---
fs/nilfs2/segment.c | 2 +-
fs/nilfs2/the_nilfs.h | 2 +-
fs/reiserfs/xattr.c | 2 +-
include/linux/fs.h | 8 ++-
include/linux/list_bl.h | 18 ++++++
mm/shmem.c | 4 +-
14 files changed, 139 insertions(+), 80 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7947bf0..c7a2bef 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -3855,7 +3855,7 @@ again:
p = &root->inode_tree.rb_node;
parent = NULL;

- if (hlist_unhashed(&inode->i_hash))
+ if (inode_unhashed(inode))
return;

spin_lock(&root->inode_lock);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index be40b8d..31d7f35 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -958,7 +958,7 @@ void __mark_inode_dirty(struct inode *inode, int flags)
* dirty list. Add blockdev inodes as well.
*/
if (!S_ISBLK(inode->i_mode)) {
- if (hlist_unhashed(&inode->i_hash))
+ if (inode_unhashed(inode))
goto out;
}
if (inode->i_state & I_FREEING)
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 4f55651..24591be 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -148,7 +148,7 @@ struct hfs_sb_info {

int fs_div;

- struct hlist_head rsrc_inodes;
+ struct hlist_bl_head rsrc_inodes;
};

#define HFS_FLG_BITMAP_DIRTY 0
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 397b7ad..7778298 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -524,7 +524,7 @@ static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
HFS_I(inode)->rsrc_inode = dir;
HFS_I(dir)->rsrc_inode = inode;
igrab(dir);
- hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes);
+ hlist_bl_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes);
mark_inode_dirty(inode);
out:
d_add(dentry, inode);
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index dc856be..499f5a5 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -144,7 +144,7 @@ struct hfsplus_sb_info {

unsigned long flags;

- struct hlist_head rsrc_inodes;
+ struct hlist_bl_head rsrc_inodes;
};

#define HFSPLUS_SB_WRITEBACKUP 0x0001
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index c5a979d..b755cf0 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -202,7 +202,7 @@ static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dent
HFSPLUS_I(inode).rsrc_inode = dir;
HFSPLUS_I(dir).rsrc_inode = inode;
igrab(dir);
- hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
+ hlist_bl_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
mark_inode_dirty(inode);
out:
d_add(dentry, inode);
diff --git a/fs/inode.c b/fs/inode.c
index f595542..dd3270a 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -24,12 +24,20 @@
#include <linux/mount.h>
#include <linux/async.h>
#include <linux/posix_acl.h>
+#include <linux/bit_spinlock.h>

/*
* Locking rules.
*
* inode->i_lock protects:
* i_ref
+ * inode hash lock protects:
+ * inode hash table, i_hash
+ *
+ * Lock orders
+ * inode_lock
+ * inode hash bucket lock
+ * inode->i_lock
*/

/*
@@ -66,6 +74,7 @@

static unsigned int i_hash_mask __read_mostly;
static unsigned int i_hash_shift __read_mostly;
+static struct hlist_bl_head *inode_hashtable __read_mostly;

/*
* Each inode can be on two separate lists. One is
@@ -78,9 +87,7 @@ static unsigned int i_hash_shift __read_mostly;
* A "dirty" list is maintained for each super block,
* allowing for low-overhead inode sync() operations.
*/
-
static LIST_HEAD(inode_lru);
-static struct hlist_head *inode_hashtable __read_mostly;

/*
* A simple spinlock to protect the list manipulations.
@@ -295,7 +302,7 @@ void destroy_inode(struct inode *inode)
void inode_init_once(struct inode *inode)
{
memset(inode, 0, sizeof(*inode));
- INIT_HLIST_NODE(&inode->i_hash);
+ init_hlist_bl_node(&inode->i_hash);
INIT_LIST_HEAD(&inode->i_dentry);
INIT_LIST_HEAD(&inode->i_devices);
INIT_LIST_HEAD(&inode->i_wb_list);
@@ -377,9 +384,13 @@ static unsigned long hash(struct super_block *sb, unsigned long hashval)
*/
void __insert_inode_hash(struct inode *inode, unsigned long hashval)
{
- struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval);
+ struct hlist_bl_head *b;
+
+ b = inode_hashtable + hash(inode->i_sb, hashval);
spin_lock(&inode_lock);
- hlist_add_head(&inode->i_hash, head);
+ hlist_bl_lock(b);
+ hlist_bl_add_head(&inode->i_hash, b);
+ hlist_bl_unlock(b);
spin_unlock(&inode_lock);
}
EXPORT_SYMBOL(__insert_inode_hash);
@@ -393,7 +404,12 @@ EXPORT_SYMBOL(__insert_inode_hash);
*/
static void __remove_inode_hash(struct inode *inode)
{
- hlist_del_init(&inode->i_hash);
+ struct hlist_bl_head *b;
+
+ b = inode_hashtable + hash(inode->i_sb, inode->i_ino);
+ hlist_bl_lock(b);
+ hlist_bl_del_init(&inode->i_hash);
+ hlist_bl_unlock(b);
}

/**
@@ -405,7 +421,7 @@ static void __remove_inode_hash(struct inode *inode)
void remove_inode_hash(struct inode *inode)
{
spin_lock(&inode_lock);
- hlist_del_init(&inode->i_hash);
+ __remove_inode_hash(inode);
spin_unlock(&inode_lock);
}
EXPORT_SYMBOL(remove_inode_hash);
@@ -673,25 +689,28 @@ static void __wait_on_freeing_inode(struct inode *inode);
* add any additional branch in the common code.
*/
static struct inode *find_inode(struct super_block *sb,
- struct hlist_head *head,
+ struct hlist_bl_head *b,
int (*test)(struct inode *, void *),
void *data)
{
- struct hlist_node *node;
+ struct hlist_bl_node *node;
struct inode *inode = NULL;

repeat:
- hlist_for_each_entry(inode, node, head, i_hash) {
+ hlist_bl_lock(b);
+ hlist_bl_for_each_entry(inode, node, b, i_hash) {
if (inode->i_sb != sb)
continue;
if (!test(inode, data))
continue;
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
+ hlist_bl_unlock(b);
__wait_on_freeing_inode(inode);
goto repeat;
}
break;
}
+ hlist_bl_unlock(b);
return node ? inode : NULL;
}

@@ -700,33 +719,40 @@ repeat:
* iget_locked for details.
*/
static struct inode *find_inode_fast(struct super_block *sb,
- struct hlist_head *head, unsigned long ino)
+ struct hlist_bl_head *b,
+ unsigned long ino)
{
- struct hlist_node *node;
+ struct hlist_bl_node *node;
struct inode *inode = NULL;

repeat:
- hlist_for_each_entry(inode, node, head, i_hash) {
+ hlist_bl_lock(b);
+ hlist_bl_for_each_entry(inode, node, b, i_hash) {
if (inode->i_ino != ino)
continue;
if (inode->i_sb != sb)
continue;
if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
+ hlist_bl_unlock(b);
__wait_on_freeing_inode(inode);
goto repeat;
}
break;
}
+ hlist_bl_unlock(b);
return node ? inode : NULL;
}

static inline void
-__inode_add_to_lists(struct super_block *sb, struct hlist_head *head,
+__inode_add_to_lists(struct super_block *sb, struct hlist_bl_head *b,
struct inode *inode)
{
list_add(&inode->i_sb_list, &sb->s_inodes);
- if (head)
- hlist_add_head(&inode->i_hash, head);
+ if (b) {
+ hlist_bl_lock(b);
+ hlist_bl_add_head(&inode->i_hash, b);
+ hlist_bl_unlock(b);
+ }
}

/**
@@ -743,10 +769,10 @@ __inode_add_to_lists(struct super_block *sb, struct hlist_head *head,
*/
void inode_add_to_lists(struct super_block *sb, struct inode *inode)
{
- struct hlist_head *head = inode_hashtable + hash(sb, inode->i_ino);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, inode->i_ino);

spin_lock(&inode_lock);
- __inode_add_to_lists(sb, head, inode);
+ __inode_add_to_lists(sb, b, inode);
spin_unlock(&inode_lock);
}
EXPORT_SYMBOL_GPL(inode_add_to_lists);
@@ -829,7 +855,7 @@ EXPORT_SYMBOL(unlock_new_inode);
* -- rmk@arm.uk.linux.org
*/
static struct inode *get_new_inode(struct super_block *sb,
- struct hlist_head *head,
+ struct hlist_bl_head *b,
int (*test)(struct inode *, void *),
int (*set)(struct inode *, void *),
void *data)
@@ -842,12 +868,12 @@ static struct inode *get_new_inode(struct super_block *sb,

spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode(sb, head, test, data);
+ old = find_inode(sb, b, test, data);
if (!old) {
if (set(inode, data))
goto set_failed;

- __inode_add_to_lists(sb, head, inode);
+ __inode_add_to_lists(sb, b, inode);
inode->i_state = I_NEW;
spin_unlock(&inode_lock);

@@ -883,7 +909,7 @@ set_failed:
* comment at iget_locked for details.
*/
static struct inode *get_new_inode_fast(struct super_block *sb,
- struct hlist_head *head, unsigned long ino)
+ struct hlist_bl_head *b, unsigned long ino)
{
struct inode *inode;

@@ -893,10 +919,10 @@ static struct inode *get_new_inode_fast(struct super_block *sb,

spin_lock(&inode_lock);
/* We released the lock, so.. */
- old = find_inode_fast(sb, head, ino);
+ old = find_inode_fast(sb, b, ino);
if (!old) {
inode->i_ino = ino;
- __inode_add_to_lists(sb, head, inode);
+ __inode_add_to_lists(sb, b, inode);
inode->i_state = I_NEW;
spin_unlock(&inode_lock);

@@ -945,7 +971,7 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
*/
static unsigned int counter;
struct inode *inode;
- struct hlist_head *head;
+ struct hlist_bl_head *b;
ino_t res;

spin_lock(&inode_lock);
@@ -953,8 +979,8 @@ ino_t iunique(struct super_block *sb, ino_t max_reserved)
if (counter <= max_reserved)
counter = max_reserved + 1;
res = counter++;
- head = inode_hashtable + hash(sb, res);
- inode = find_inode_fast(sb, head, res);
+ b = inode_hashtable + hash(sb, res);
+ inode = find_inode_fast(sb, b, res);
} while (inode != NULL);
spin_unlock(&inode_lock);

@@ -1003,13 +1029,14 @@ EXPORT_SYMBOL(igrab);
* Note, @test is called with the inode_lock held, so can't sleep.
*/
static struct inode *ifind(struct super_block *sb,
- struct hlist_head *head, int (*test)(struct inode *, void *),
+ struct hlist_bl_head *b,
+ int (*test)(struct inode *, void *),
void *data, const int wait)
{
struct inode *inode;

spin_lock(&inode_lock);
- inode = find_inode(sb, head, test, data);
+ inode = find_inode(sb, b, test, data);
if (inode) {
spin_lock(&inode->i_lock);
inode->i_ref++;
@@ -1039,12 +1066,13 @@ static struct inode *ifind(struct super_block *sb,
* Otherwise NULL is returned.
*/
static struct inode *ifind_fast(struct super_block *sb,
- struct hlist_head *head, unsigned long ino)
+ struct hlist_bl_head *b,
+ unsigned long ino)
{
struct inode *inode;

spin_lock(&inode_lock);
- inode = find_inode_fast(sb, head, ino);
+ inode = find_inode_fast(sb, b, ino);
if (inode) {
spin_lock(&inode->i_lock);
inode->i_ref++;
@@ -1081,9 +1109,9 @@ static struct inode *ifind_fast(struct super_block *sb,
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *), void *data)
{
- struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, hashval);

- return ifind(sb, head, test, data, 0);
+ return ifind(sb, b, test, data, 0);
}
EXPORT_SYMBOL(ilookup5_nowait);

@@ -1109,9 +1137,9 @@ EXPORT_SYMBOL(ilookup5_nowait);
struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *), void *data)
{
- struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, hashval);

- return ifind(sb, head, test, data, 1);
+ return ifind(sb, b, test, data, 1);
}
EXPORT_SYMBOL(ilookup5);

@@ -1131,9 +1159,9 @@ EXPORT_SYMBOL(ilookup5);
*/
struct inode *ilookup(struct super_block *sb, unsigned long ino)
{
- struct hlist_head *head = inode_hashtable + hash(sb, ino);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, ino);

- return ifind_fast(sb, head, ino);
+ return ifind_fast(sb, b, ino);
}
EXPORT_SYMBOL(ilookup);

@@ -1161,17 +1189,17 @@ struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
int (*test)(struct inode *, void *),
int (*set)(struct inode *, void *), void *data)
{
- struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, hashval);
struct inode *inode;

- inode = ifind(sb, head, test, data, 1);
+ inode = ifind(sb, b, test, data, 1);
if (inode)
return inode;
/*
* get_new_inode() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode(sb, head, test, set, data);
+ return get_new_inode(sb, b, test, set, data);
}
EXPORT_SYMBOL(iget5_locked);

@@ -1192,17 +1220,17 @@ EXPORT_SYMBOL(iget5_locked);
*/
struct inode *iget_locked(struct super_block *sb, unsigned long ino)
{
- struct hlist_head *head = inode_hashtable + hash(sb, ino);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, ino);
struct inode *inode;

- inode = ifind_fast(sb, head, ino);
+ inode = ifind_fast(sb, b, ino);
if (inode)
return inode;
/*
* get_new_inode_fast() will do the right thing, re-trying the search
* in case it had to block at any point.
*/
- return get_new_inode_fast(sb, head, ino);
+ return get_new_inode_fast(sb, b, ino);
}
EXPORT_SYMBOL(iget_locked);

@@ -1210,14 +1238,15 @@ int insert_inode_locked(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
ino_t ino = inode->i_ino;
- struct hlist_head *head = inode_hashtable + hash(sb, ino);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, ino);

inode->i_state |= I_NEW;
while (1) {
- struct hlist_node *node;
+ struct hlist_bl_node *node;
struct inode *old = NULL;
spin_lock(&inode_lock);
- hlist_for_each_entry(old, node, head, i_hash) {
+ hlist_bl_lock(b);
+ hlist_bl_for_each_entry(old, node, b, i_hash) {
if (old->i_ino != ino)
continue;
if (old->i_sb != sb)
@@ -1227,16 +1256,18 @@ int insert_inode_locked(struct inode *inode)
break;
}
if (likely(!node)) {
- hlist_add_head(&inode->i_hash, head);
+ hlist_bl_add_head(&inode->i_hash, b);
+ hlist_bl_unlock(b);
spin_unlock(&inode_lock);
return 0;
}
spin_lock(&old->i_lock);
old->i_ref++;
spin_unlock(&old->i_lock);
+ hlist_bl_unlock(b);
spin_unlock(&inode_lock);
wait_on_inode(old);
- if (unlikely(!hlist_unhashed(&old->i_hash))) {
+ if (unlikely(!inode_unhashed(old))) {
iput(old);
return -EBUSY;
}
@@ -1249,16 +1280,17 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
int (*test)(struct inode *, void *), void *data)
{
struct super_block *sb = inode->i_sb;
- struct hlist_head *head = inode_hashtable + hash(sb, hashval);
+ struct hlist_bl_head *b = inode_hashtable + hash(sb, hashval);

inode->i_state |= I_NEW;

while (1) {
- struct hlist_node *node;
+ struct hlist_bl_node *node;
struct inode *old = NULL;

spin_lock(&inode_lock);
- hlist_for_each_entry(old, node, head, i_hash) {
+ hlist_bl_lock(b);
+ hlist_bl_for_each_entry(old, node, b, i_hash) {
if (old->i_sb != sb)
continue;
if (!test(old, data))
@@ -1268,16 +1300,18 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
break;
}
if (likely(!node)) {
- hlist_add_head(&inode->i_hash, head);
+ hlist_bl_add_head(&inode->i_hash, b);
+ hlist_bl_unlock(b);
spin_unlock(&inode_lock);
return 0;
}
spin_lock(&old->i_lock);
old->i_ref++;
spin_unlock(&old->i_lock);
+ hlist_bl_unlock(b);
spin_unlock(&inode_lock);
wait_on_inode(old);
- if (unlikely(!hlist_unhashed(&old->i_hash))) {
+ if (unlikely(!inode_unhashed(old))) {
iput(old);
return -EBUSY;
}
@@ -1300,7 +1334,7 @@ EXPORT_SYMBOL(generic_delete_inode);
*/
int generic_drop_inode(struct inode *inode)
{
- return !inode->i_nlink || hlist_unhashed(&inode->i_hash);
+ return !inode->i_nlink || inode_unhashed(inode);
}
EXPORT_SYMBOL_GPL(generic_drop_inode);

@@ -1340,7 +1374,6 @@ static void iput_final(struct inode *inode)
spin_lock(&inode_lock);
WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_WILL_FREE;
- hlist_del_init(&inode->i_hash);
__remove_inode_hash(inode);
}
list_del_init(&inode->i_wb_list);
@@ -1604,7 +1637,7 @@ void __init inode_init_early(void)

inode_hashtable =
alloc_large_system_hash("Inode-cache",
- sizeof(struct hlist_head),
+ sizeof(struct hlist_bl_head),
ihash_entries,
14,
HASH_EARLY,
@@ -1637,7 +1670,7 @@ void __init inode_init(void)

inode_hashtable =
alloc_large_system_hash("Inode-cache",
- sizeof(struct hlist_head),
+ sizeof(struct hlist_bl_head),
ihash_entries,
14,
0,
@@ -1646,7 +1679,7 @@ void __init inode_init(void)
0);

for (loop = 0; loop < (1 << i_hash_shift); loop++)
- INIT_HLIST_HEAD(&inode_hashtable[loop]);
+ INIT_HLIST_BL_HEAD(&inode_hashtable[loop]);
}

void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index bed3a78..ce7344e 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -196,13 +196,13 @@ int nilfs_init_gccache(struct the_nilfs *nilfs)
INIT_LIST_HEAD(&nilfs->ns_gc_inodes);

nilfs->ns_gc_inodes_h =
- kmalloc(sizeof(struct hlist_head) * NILFS_GCINODE_HASH_SIZE,
+ kmalloc(sizeof(struct hlist_bl_head) * NILFS_GCINODE_HASH_SIZE,
GFP_NOFS);
if (nilfs->ns_gc_inodes_h == NULL)
return -ENOMEM;

for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++)
- INIT_HLIST_HEAD(&nilfs->ns_gc_inodes_h[loop]);
+ INIT_HLIST_BL_HEAD(&nilfs->ns_gc_inodes_h[loop]);
return 0;
}

@@ -254,18 +254,18 @@ static unsigned long ihash(ino_t ino, __u64 cno)
*/
struct inode *nilfs_gc_iget(struct the_nilfs *nilfs, ino_t ino, __u64 cno)
{
- struct hlist_head *head = nilfs->ns_gc_inodes_h + ihash(ino, cno);
- struct hlist_node *node;
+ struct hlist_bl_head *head = nilfs->ns_gc_inodes_h + ihash(ino, cno);
+ struct hlist_bl_node *node;
struct inode *inode;

- hlist_for_each_entry(inode, node, head, i_hash) {
+ hlist_bl_for_each_entry(inode, node, head, i_hash) {
if (inode->i_ino == ino && NILFS_I(inode)->i_cno == cno)
return inode;
}

inode = alloc_gcinode(nilfs, ino, cno);
if (likely(inode)) {
- hlist_add_head(&inode->i_hash, head);
+ hlist_bl_add_head(&inode->i_hash, head);
list_add(&NILFS_I(inode)->i_dirty, &nilfs->ns_gc_inodes);
}
return inode;
@@ -284,16 +284,18 @@ void nilfs_clear_gcinode(struct inode *inode)
*/
void nilfs_remove_all_gcinode(struct the_nilfs *nilfs)
{
- struct hlist_head *head = nilfs->ns_gc_inodes_h;
- struct hlist_node *node, *n;
+ struct hlist_bl_head *head = nilfs->ns_gc_inodes_h;
+ struct hlist_bl_node *node;
struct inode *inode;
int loop;

for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++, head++) {
- hlist_for_each_entry_safe(inode, node, n, head, i_hash) {
- hlist_del_init(&inode->i_hash);
+restart:
+ hlist_bl_for_each_entry(inode, node, head, i_hash) {
+ hlist_bl_del_init(&inode->i_hash);
list_del_init(&NILFS_I(inode)->i_dirty);
nilfs_clear_gcinode(inode); /* might sleep */
+ goto restart;
}
}
}
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 9fd051a..038251c 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2452,7 +2452,7 @@ nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head)
list_for_each_entry_safe(ii, n, head, i_dirty) {
if (!test_bit(NILFS_I_UPDATED, &ii->i_state))
continue;
- hlist_del_init(&ii->vfs_inode.i_hash);
+ hlist_bl_del_init(&ii->vfs_inode.i_hash);
list_del_init(&ii->i_dirty);
nilfs_clear_gcinode(&ii->vfs_inode);
}
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index f785a7b..1ab441a 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -167,7 +167,7 @@ struct the_nilfs {

/* GC inode list and hash table head */
struct list_head ns_gc_inodes;
- struct hlist_head *ns_gc_inodes_h;
+ struct hlist_bl_head *ns_gc_inodes_h;

/* Disk layout information (static) */
unsigned int ns_blocksize_bits;
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 8c4cf27..b246e3c 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -424,7 +424,7 @@ int reiserfs_prepare_write(struct file *f, struct page *page,
static void update_ctime(struct inode *inode)
{
struct timespec now = current_fs_time(inode->i_sb);
- if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink ||
+ if (inode_unhashed(inode) || !inode->i_nlink ||
timespec_equal(&inode->i_ctime, &now))
return;

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0b6ee34..67dd926 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -383,6 +383,7 @@ struct inodes_stat_t {
#include <linux/capability.h>
#include <linux/semaphore.h>
#include <linux/fiemap.h>
+#include <linux/list_bl.h>

#include <asm/atomic.h>
#include <asm/byteorder.h>
@@ -724,7 +725,7 @@ struct posix_acl;
#define ACL_NOT_CACHED ((void *)(-1))

struct inode {
- struct hlist_node i_hash;
+ struct hlist_bl_node i_hash;
struct list_head i_wb_list; /* backing dev IO list */
struct list_head i_lru; /* inode LRU list */
struct list_head i_sb_list;
@@ -789,6 +790,11 @@ struct inode {
void *i_private; /* fs or device private pointer */
};

+static inline int inode_unhashed(struct inode *inode)
+{
+ return hlist_bl_unhashed(&inode->i_hash);
+}
+
/*
* inode->i_mutex nesting subclasses for the lock validator:
*
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 961bc89..0d791ff 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -125,3 +125,21 @@ static inline void hlist_bl_del_init(struct hlist_bl_node *n)
pos = pos->next)

#endif
+
+/**
+ * hlist_bl_lock - lock a hash list
+ * @h: hash list head to lock
+ */
+static inline void hlist_bl_lock(struct hlist_bl_head *h)
+{
+ bit_spin_lock(0, (unsigned long *)h);
+}
+
+/**
+ * hlist_bl_unlock - unlock a hash list
+ * @h: hash list head to unlock
+ */
+static inline void hlist_bl_unlock(struct hlist_bl_head *h)
+{
+ __bit_spin_unlock(0, (unsigned long *)h);
+}
diff --git a/mm/shmem.c b/mm/shmem.c
index 7d0bc16..419de2c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2146,7 +2146,7 @@ static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
if (*len < 3)
return 255;

- if (hlist_unhashed(&inode->i_hash)) {
+ if (inode_unhashed(inode)) {
/* Unfortunately insert_inode_hash is not idempotent,
* so as we hash inodes here rather than at creation
* time, we need a lock to ensure we only try
@@ -2154,7 +2154,7 @@ static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
*/
static DEFINE_SPINLOCK(lock);
spin_lock(&lock);
- if (hlist_unhashed(&inode->i_hash))
+ if (inode_unhashed(inode))
__insert_inode_hash(inode,
inode->i_ino + inode->i_generation);
spin_unlock(&lock);
--
1.7.1


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