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    Subject[patch 36/52] fs: icache per-bucket inode hash locks
    Remove the global inode_hash_lock and replace it with per-hash-bucket locks.

    Signed-off-by: Nick Piggin <npiggin@suse.de>
    ---
    fs/inode.c | 167 ++++++++++++++++++++++++++++++++-----------------------------
    1 file changed, 90 insertions(+), 77 deletions(-)

    Index: linux-2.6/fs/inode.c
    ===================================================================
    --- linux-2.6.orig/fs/inode.c
    +++ linux-2.6/fs/inode.c
    @@ -25,12 +25,13 @@
    #include <linux/mount.h>
    #include <linux/async.h>
    #include <linux/posix_acl.h>
    +#include <linux/bit_spinlock.h>

    /*
    * Usage:
    * sb_inode_list_lock protects:
    * s_inodes, i_sb_list
    - * inode_hash_lock protects:
    + * inode_hash_bucket lock protects:
    * inode hash table, i_hash
    * wb_inode_list_lock protects:
    * inode_in_use, inode_unused, b_io, b_more_io, b_dirty, i_list
    @@ -46,7 +47,7 @@
    * sb_inode_list_lock
    * inode->i_lock
    * wb_inode_list_lock
    - * inode_hash_lock
    + * inode_hash_bucket lock
    */
    /*
    * This is needed for the following functions:
    @@ -97,7 +98,22 @@ static unsigned int i_hash_shift __read_

    LIST_HEAD(inode_in_use);
    LIST_HEAD(inode_unused);
    -static struct hlist_head *inode_hashtable __read_mostly;
    +
    +struct inode_hash_bucket {
    + struct hlist_bl_head head;
    +};
    +
    +static inline void spin_lock_bucket(struct inode_hash_bucket *b)
    +{
    + bit_spin_lock(0, (unsigned long *)b);
    +}
    +
    +static inline void spin_unlock_bucket(struct inode_hash_bucket *b)
    +{
    + __bit_spin_unlock(0, (unsigned long *)b);
    +}
    +
    +static struct inode_hash_bucket *inode_hashtable __read_mostly;

    /*
    * A simple spinlock to protect the list manipulations.
    @@ -107,7 +123,6 @@ static struct hlist_head *inode_hashtabl
    */
    DEFINE_SPINLOCK(sb_inode_list_lock);
    DEFINE_SPINLOCK(wb_inode_list_lock);
    -static DEFINE_SPINLOCK(inode_hash_lock);

    /*
    * iprune_sem provides exclusion between the kswapd or try_to_free_pages
    @@ -280,7 +295,7 @@ 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_RADIX_TREE(&inode->i_data.page_tree, GFP_ATOMIC);
    @@ -596,20 +611,21 @@ static void __wait_on_freeing_inode(stru
    * add any additional branch in the common code.
    */
    static struct inode *find_inode(struct super_block *sb,
    - struct hlist_head *head,
    + struct inode_hash_bucket *b,
    int (*test)(struct inode *, void *),
    void *data)
    {
    - struct hlist_node *node;
    + struct hlist_bl_node *node;
    struct inode *inode = NULL;

    repeat:
    - spin_lock(&inode_hash_lock);
    - hlist_for_each_entry(inode, node, head, i_hash) {
    + spin_lock_bucket(b);
    + hlist_bl_for_each_entry(inode, node, &b->head, i_hash) {
    if (inode->i_sb != sb)
    continue;
    if (!spin_trylock(&inode->i_lock)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    + cpu_relax();
    goto repeat;
    }
    if (!test(inode, data)) {
    @@ -617,13 +633,13 @@ repeat:
    continue;
    }
    if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    __wait_on_freeing_inode(inode);
    goto repeat;
    }
    break;
    }
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    return node ? inode : NULL;
    }

    @@ -632,30 +648,32 @@ repeat:
    * iget_locked for details.
    */
    static struct inode *find_inode_fast(struct super_block *sb,
    - struct hlist_head *head, unsigned long ino)
    + struct inode_hash_bucket *b,
    + unsigned long ino)
    {
    - struct hlist_node *node;
    + struct hlist_bl_node *node;
    struct inode *inode = NULL;

    repeat:
    - spin_lock(&inode_hash_lock);
    - hlist_for_each_entry(inode, node, head, i_hash) {
    + spin_lock_bucket(b);
    + hlist_bl_for_each_entry(inode, node, &b->head, i_hash) {
    if (inode->i_ino != ino)
    continue;
    if (inode->i_sb != sb)
    continue;
    if (!spin_trylock(&inode->i_lock)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    + cpu_relax();
    goto repeat;
    }
    if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    __wait_on_freeing_inode(inode);
    goto repeat;
    }
    break;
    }
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    return node ? inode : NULL;
    }

    @@ -670,7 +688,7 @@ static unsigned long hash(struct super_b
    }

    static inline void
    -__inode_add_to_lists(struct super_block *sb, struct hlist_head *head,
    +__inode_add_to_lists(struct super_block *sb, struct inode_hash_bucket *b,
    struct inode *inode)
    {
    atomic_inc(&inodes_stat.nr_inodes);
    @@ -679,10 +697,10 @@ __inode_add_to_lists(struct super_block
    spin_lock(&wb_inode_list_lock);
    list_add(&inode->i_list, &inode_in_use);
    spin_unlock(&wb_inode_list_lock);
    - if (head) {
    - spin_lock(&inode_hash_lock);
    - hlist_add_head(&inode->i_hash, head);
    - spin_unlock(&inode_hash_lock);
    + if (b) {
    + spin_lock_bucket(b);
    + hlist_bl_add_head(&inode->i_hash, &b->head);
    + spin_unlock_bucket(b);
    }
    }

    @@ -700,11 +718,11 @@ __inode_add_to_lists(struct super_block
    */
    void inode_add_to_lists(struct super_block *sb, struct inode *inode)
    {
    - struct hlist_head *head = inode_hashtable + hash(sb, inode->i_ino);
    + struct inode_hash_bucket *b = inode_hashtable + hash(sb, inode->i_ino);

    spin_lock(&sb_inode_list_lock);
    spin_lock(&inode->i_lock);
    - __inode_add_to_lists(sb, head, inode);
    + __inode_add_to_lists(sb, b, inode);
    spin_unlock(&inode->i_lock);
    }
    EXPORT_SYMBOL_GPL(inode_add_to_lists);
    @@ -786,7 +804,7 @@ 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 inode_hash_bucket *b,
    int (*test)(struct inode *, void *),
    int (*set)(struct inode *, void *),
    void *data)
    @@ -798,7 +816,7 @@ static struct inode *get_new_inode(struc
    struct inode *old;

    /* We released the lock, so.. */
    - old = find_inode(sb, head, test, data);
    + old = find_inode(sb, b, test, data);
    if (!old) {
    spin_lock(&sb_inode_list_lock);
    spin_lock(&inode->i_lock);
    @@ -806,7 +824,7 @@ static struct inode *get_new_inode(struc
    goto set_failed;

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

    /* Return the locked inode with I_NEW set, the
    @@ -840,7 +858,7 @@ 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 inode_hash_bucket *b, unsigned long ino)
    {
    struct inode *inode;

    @@ -849,13 +867,13 @@ static struct inode *get_new_inode_fast(
    struct inode *old;

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

    /* Return the locked inode with I_NEW set, the
    @@ -878,19 +896,20 @@ static struct inode *get_new_inode_fast(
    return inode;
    }

    -static int test_inode_iunique(struct super_block * sb, struct hlist_head *head, unsigned long ino)
    +static int test_inode_iunique(struct super_block *sb,
    + struct inode_hash_bucket *b, unsigned long ino)
    {
    - struct hlist_node *node;
    - struct inode * inode = NULL;
    + struct hlist_bl_node *node;
    + struct inode *inode = NULL;

    - spin_lock(&inode_hash_lock);
    - hlist_for_each_entry(inode, node, head, i_hash) {
    + spin_lock_bucket(b);
    + hlist_bl_for_each_entry(inode, node, &b->head, i_hash) {
    if (inode->i_ino == ino && inode->i_sb == sb) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    return 0;
    }
    }
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    return 1;
    }

    @@ -917,7 +936,7 @@ ino_t iunique(struct super_block *sb, in
    */
    static DEFINE_SPINLOCK(unique_lock);
    static unsigned int counter;
    - struct hlist_head *head;
    + struct inode_hash_bucket *b;
    ino_t res;

    spin_lock(&unique_lock);
    @@ -925,8 +944,8 @@ ino_t iunique(struct super_block *sb, in
    if (counter <= max_reserved)
    counter = max_reserved + 1;
    res = counter++;
    - head = inode_hashtable + hash(sb, res);
    - } while (!test_inode_iunique(sb, head, res));
    + b = inode_hashtable + hash(sb, res);
    + } while (!test_inode_iunique(sb, b, res));
    spin_unlock(&unique_lock);

    return res;
    @@ -973,12 +992,13 @@ 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 inode_hash_bucket *b,
    + int (*test)(struct inode *, void *),
    void *data, const int wait)
    {
    struct inode *inode;

    - inode = find_inode(sb, head, test, data);
    + inode = find_inode(sb, b, test, data);
    if (inode) {
    __iget(inode);
    spin_unlock(&inode->i_lock);
    @@ -1005,11 +1025,12 @@ static struct inode *ifind(struct super_
    * Otherwise NULL is returned.
    */
    static struct inode *ifind_fast(struct super_block *sb,
    - struct hlist_head *head, unsigned long ino)
    + struct inode_hash_bucket *b,
    + unsigned long ino)
    {
    struct inode *inode;

    - inode = find_inode_fast(sb, head, ino);
    + inode = find_inode_fast(sb, b, ino);
    if (inode) {
    __iget(inode);
    spin_unlock(&inode->i_lock);
    @@ -1043,9 +1064,9 @@ static struct inode *ifind_fast(struct s
    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 inode_hash_bucket *b = inode_hashtable + hash(sb, hashval);

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

    @@ -1071,9 +1092,9 @@ 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 inode_hash_bucket *b = inode_hashtable + hash(sb, hashval);

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

    @@ -1093,9 +1114,9 @@ EXPORT_SYMBOL(ilookup5);
    */
    struct inode *ilookup(struct super_block *sb, unsigned long ino)
    {
    - struct hlist_head *head = inode_hashtable + hash(sb, ino);
    + struct inode_hash_bucket *b = inode_hashtable + hash(sb, ino);

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

    @@ -1123,17 +1144,17 @@ struct inode *iget5_locked(struct super_
    int (*test)(struct inode *, void *),
    int (*set)(struct inode *, void *), void *data)
    {
    - struct hlist_head *head = inode_hashtable + hash(sb, hashval);
    + struct inode_hash_bucket *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);

    @@ -1154,17 +1175,17 @@ 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 inode_hash_bucket *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);

    @@ -1172,16 +1193,16 @@ int insert_inode_locked(struct inode *in
    {
    struct super_block *sb = inode->i_sb;
    ino_t ino = inode->i_ino;
    - struct hlist_head *head = inode_hashtable + hash(sb, ino);
    + struct inode_hash_bucket *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;

    repeat:
    - spin_lock(&inode_hash_lock);
    - hlist_for_each_entry(old, node, head, i_hash) {
    + spin_lock_bucket(b);
    + hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
    if (old->i_ino != ino)
    continue;
    if (old->i_sb != sb)
    @@ -1189,21 +1210,21 @@ repeat:
    if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
    continue;
    if (!spin_trylock(&old->i_lock)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    goto repeat;
    }
    break;
    }
    if (likely(!node)) {
    - hlist_add_head(&inode->i_hash, head);
    - spin_unlock(&inode_hash_lock);
    + hlist_bl_add_head(&inode->i_hash, &b->head);
    + spin_unlock_bucket(b);
    return 0;
    }
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    __iget(old);
    spin_unlock(&old->i_lock);
    wait_on_inode(old);
    - if (unlikely(!hlist_unhashed(&old->i_hash))) {
    + if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
    iput(old);
    return -EBUSY;
    }
    @@ -1216,17 +1237,17 @@ int insert_inode_locked4(struct inode *i
    int (*test)(struct inode *, void *), void *data)
    {
    struct super_block *sb = inode->i_sb;
    - struct hlist_head *head = inode_hashtable + hash(sb, hashval);
    + struct inode_hash_bucket *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;

    repeat:
    - spin_lock(&inode_hash_lock);
    - hlist_for_each_entry(old, node, head, i_hash) {
    + spin_lock_bucket(b);
    + hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
    if (old->i_sb != sb)
    continue;
    if (!test(old, data))
    @@ -1234,21 +1255,21 @@ repeat:
    if (old->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE))
    continue;
    if (!spin_trylock(&old->i_lock)) {
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    goto repeat;
    }
    break;
    }
    if (likely(!node)) {
    - hlist_add_head(&inode->i_hash, head);
    - spin_unlock(&inode_hash_lock);
    + hlist_bl_add_head(&inode->i_hash, &b->head);
    + spin_unlock_bucket(b);
    return 0;
    }
    - spin_unlock(&inode_hash_lock);
    + spin_unlock_bucket(b);
    __iget(old);
    spin_unlock(&old->i_lock);
    wait_on_inode(old);
    - if (unlikely(!hlist_unhashed(&old->i_hash))) {
    + if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
    iput(old);
    return -EBUSY;
    }
    @@ -1267,12 +1288,12 @@ EXPORT_SYMBOL(insert_inode_locked4);
    */
    void __insert_inode_hash(struct inode *inode, unsigned long hashval)
    {
    - struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval);
    + struct inode_hash_bucket *b = inode_hashtable + hash(inode->i_sb, hashval);

    spin_lock(&inode->i_lock);
    - spin_lock(&inode_hash_lock);
    - hlist_add_head(&inode->i_hash, head);
    - spin_unlock(&inode_hash_lock);
    + spin_lock_bucket(b);
    + hlist_bl_add_head(&inode->i_hash, &b->head);
    + spin_unlock_bucket(b);
    spin_unlock(&inode->i_lock);
    }
    EXPORT_SYMBOL(__insert_inode_hash);
    @@ -1286,9 +1307,10 @@ EXPORT_SYMBOL(__insert_inode_hash);
    */
    void __remove_inode_hash(struct inode *inode)
    {
    - spin_lock(&inode_hash_lock);
    - hlist_del_init(&inode->i_hash);
    - spin_unlock(&inode_hash_lock);
    + struct inode_hash_bucket *b = inode_hashtable + hash(inode->i_sb, inode->i_ino);
    + spin_lock_bucket(b);
    + hlist_bl_del_init(&inode->i_hash);
    + spin_unlock_bucket(b);
    }

    /**
    @@ -1370,7 +1392,7 @@ int generic_detach_inode(struct inode *i
    {
    struct super_block *sb = inode->i_sb;

    - if (!hlist_unhashed(&inode->i_hash)) {
    + if (!hlist_bl_unhashed(&inode->i_hash)) {
    if (!(inode->i_state & (I_DIRTY|I_SYNC))) {
    spin_lock(&wb_inode_list_lock);
    list_move(&inode->i_list, &inode_unused);
    @@ -1699,7 +1721,7 @@ void __init inode_init_early(void)

    inode_hashtable =
    alloc_large_system_hash("Inode-cache",
    - sizeof(struct hlist_head),
    + sizeof(struct inode_hash_bucket),
    ihash_entries,
    14,
    HASH_EARLY,
    @@ -1708,7 +1730,7 @@ void __init inode_init_early(void)
    0);

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

    void __init inode_init(void)
    @@ -1730,7 +1752,7 @@ void __init inode_init(void)

    inode_hashtable =
    alloc_large_system_hash("Inode-cache",
    - sizeof(struct hlist_head),
    + sizeof(struct inode_hash_bucket),
    ihash_entries,
    14,
    0,
    @@ -1739,7 +1761,7 @@ 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].head);
    }

    void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
    Index: linux-2.6/fs/fs-writeback.c
    ===================================================================
    --- linux-2.6.orig/fs/fs-writeback.c
    +++ linux-2.6/fs/fs-writeback.c
    @@ -1147,7 +1147,7 @@ void __mark_inode_dirty(struct inode *in
    * dirty list. Add blockdev inodes as well.
    */
    if (!S_ISBLK(inode->i_mode)) {
    - if (hlist_unhashed(&inode->i_hash))
    + if (hlist_bl_unhashed(&inode->i_hash))
    goto out;
    }
    if (inode->i_state & (I_FREEING|I_CLEAR))
    Index: linux-2.6/include/linux/fs.h
    ===================================================================
    --- linux-2.6.orig/include/linux/fs.h
    +++ linux-2.6/include/linux/fs.h
    @@ -723,7 +723,7 @@ 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_list; /* backing dev IO list */
    struct list_head i_sb_list;
    struct list_head i_dentry;
    Index: linux-2.6/mm/shmem.c
    ===================================================================
    --- linux-2.6.orig/mm/shmem.c
    +++ linux-2.6/mm/shmem.c
    @@ -2122,7 +2122,7 @@ static int shmem_encode_fh(struct dentry
    if (*len < 3)
    return 255;

    - if (hlist_unhashed(&inode->i_hash)) {
    + if (hlist_bl_unhashed(&inode->i_hash)) {
    /* 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
    @@ -2130,7 +2130,7 @@ static int shmem_encode_fh(struct dentry
    */
    static DEFINE_SPINLOCK(lock);
    spin_lock(&lock);
    - if (hlist_unhashed(&inode->i_hash))
    + if (hlist_bl_unhashed(&inode->i_hash))
    __insert_inode_hash(inode,
    inode->i_ino + inode->i_generation);
    spin_unlock(&lock);
    Index: linux-2.6/fs/btrfs/inode.c
    ===================================================================
    --- linux-2.6.orig/fs/btrfs/inode.c
    +++ linux-2.6/fs/btrfs/inode.c
    @@ -3849,7 +3849,7 @@ again:
    p = &root->inode_tree.rb_node;
    parent = NULL;

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

    spin_lock(&root->inode_lock);
    Index: linux-2.6/fs/reiserfs/xattr.c
    ===================================================================
    --- linux-2.6.orig/fs/reiserfs/xattr.c
    +++ linux-2.6/fs/reiserfs/xattr.c
    @@ -424,7 +424,7 @@ int reiserfs_prepare_write(struct file *
    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 (hlist_bl_unhashed(&inode->i_hash) || !inode->i_nlink ||
    timespec_equal(&inode->i_ctime, &now))
    return;

    Index: linux-2.6/fs/hfs/hfs_fs.h
    ===================================================================
    --- linux-2.6.orig/fs/hfs/hfs_fs.h
    +++ linux-2.6/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
    Index: linux-2.6/fs/hfs/inode.c
    ===================================================================
    --- linux-2.6.orig/fs/hfs/inode.c
    +++ linux-2.6/fs/hfs/inode.c
    @@ -500,7 +500,7 @@ static struct dentry *hfs_file_lookup(st
    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);
    Index: linux-2.6/fs/hfsplus/hfsplus_fs.h
    ===================================================================
    --- linux-2.6.orig/fs/hfsplus/hfsplus_fs.h
    +++ linux-2.6/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
    Index: linux-2.6/fs/hfsplus/inode.c
    ===================================================================
    --- linux-2.6.orig/fs/hfsplus/inode.c
    +++ linux-2.6/fs/hfsplus/inode.c
    @@ -178,7 +178,7 @@ static struct dentry *hfsplus_file_looku
    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);
    Index: linux-2.6/fs/nilfs2/gcinode.c
    ===================================================================
    --- linux-2.6.orig/fs/nilfs2/gcinode.c
    +++ linux-2.6/fs/nilfs2/gcinode.c
    @@ -187,13 +187,13 @@ int nilfs_init_gccache(struct the_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;
    }

    @@ -245,18 +245,18 @@ static unsigned long ihash(ino_t ino, __
    */
    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;
    @@ -275,14 +275,14 @@ void nilfs_clear_gcinode(struct inode *i
    */
    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, *n;
    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);
    + hlist_bl_for_each_entry_safe(inode, node, n, head, i_hash) {
    + hlist_bl_del_init(&inode->i_hash);
    list_del_init(&NILFS_I(inode)->i_dirty);
    nilfs_clear_gcinode(inode); /* might sleep */
    }
    Index: linux-2.6/fs/nilfs2/segment.c
    ===================================================================
    --- linux-2.6.orig/fs/nilfs2/segment.c
    +++ linux-2.6/fs/nilfs2/segment.c
    @@ -2447,7 +2447,7 @@ nilfs_remove_written_gcinodes(struct the
    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);
    }
    Index: linux-2.6/fs/nilfs2/the_nilfs.h
    ===================================================================
    --- linux-2.6.orig/fs/nilfs2/the_nilfs.h
    +++ linux-2.6/fs/nilfs2/the_nilfs.h
    @@ -164,7 +164,7 @@ 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;



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