[PATCH] hugetlbfs: move free_inodes accounting
Move hugetlbfs accounting into ->alloc_inode / ->destroy_inode. This keeps the code simpler, fixes a loeak where a failing inode allocation wouldn't decrement the counter and moves hugetlbfs_delete_inode and hugetlbfs_forget_inode closer to their generic counterparts. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -224,8 +224,6 @@ static void truncate_hugepages(struct address_space *mapping, loff_t lstart)
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static void hugetlbfs_delete_inode(struct inode *inode)
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{
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struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(inode->i_sb);
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hlist_del_init(&inode->i_hash);
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list_del_init(&inode->i_list);
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list_del_init(&inode->i_sb_list);
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@ -238,12 +236,6 @@ static void hugetlbfs_delete_inode(struct inode *inode)
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security_inode_delete(inode);
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if (sbinfo->free_inodes >= 0) {
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spin_lock(&sbinfo->stat_lock);
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sbinfo->free_inodes++;
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spin_unlock(&sbinfo->stat_lock);
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}
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clear_inode(inode);
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destroy_inode(inode);
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}
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@ -251,7 +243,6 @@ static void hugetlbfs_delete_inode(struct inode *inode)
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static void hugetlbfs_forget_inode(struct inode *inode)
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{
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struct super_block *super_block = inode->i_sb;
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struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(super_block);
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if (hlist_unhashed(&inode->i_hash))
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goto out_truncate;
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@ -278,12 +269,6 @@ out_truncate:
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if (inode->i_data.nrpages)
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truncate_hugepages(&inode->i_data, 0);
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if (sbinfo->free_inodes >= 0) {
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spin_lock(&sbinfo->stat_lock);
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sbinfo->free_inodes++;
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spin_unlock(&sbinfo->stat_lock);
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}
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clear_inode(inode);
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destroy_inode(inode);
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}
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@ -375,17 +360,6 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
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gid_t gid, int mode, dev_t dev)
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{
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struct inode *inode;
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struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
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if (sbinfo->free_inodes >= 0) {
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spin_lock(&sbinfo->stat_lock);
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if (!sbinfo->free_inodes) {
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spin_unlock(&sbinfo->stat_lock);
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return NULL;
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}
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sbinfo->free_inodes--;
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spin_unlock(&sbinfo->stat_lock);
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}
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inode = new_inode(sb);
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if (inode) {
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@ -527,29 +501,51 @@ static void hugetlbfs_put_super(struct super_block *sb)
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}
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}
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static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo)
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{
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if (sbinfo->free_inodes >= 0) {
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spin_lock(&sbinfo->stat_lock);
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if (unlikely(!sbinfo->free_inodes)) {
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spin_unlock(&sbinfo->stat_lock);
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return 0;
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}
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sbinfo->free_inodes--;
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spin_unlock(&sbinfo->stat_lock);
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}
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return 1;
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}
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static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo)
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{
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if (sbinfo->free_inodes >= 0) {
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spin_lock(&sbinfo->stat_lock);
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sbinfo->free_inodes++;
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spin_unlock(&sbinfo->stat_lock);
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}
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}
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static kmem_cache_t *hugetlbfs_inode_cachep;
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static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
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{
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struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
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struct hugetlbfs_inode_info *p;
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p = kmem_cache_alloc(hugetlbfs_inode_cachep, SLAB_KERNEL);
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if (!p)
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if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo)))
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return NULL;
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p = kmem_cache_alloc(hugetlbfs_inode_cachep, SLAB_KERNEL);
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if (unlikely(!p)) {
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hugetlbfs_inc_free_inodes(sbinfo);
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return NULL;
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}
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return &p->vfs_inode;
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}
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static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
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{
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struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR)
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inode_init_once(&ei->vfs_inode);
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}
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static void hugetlbfs_destroy_inode(struct inode *inode)
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{
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hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
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mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
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kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
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}
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@ -561,6 +557,16 @@ static struct address_space_operations hugetlbfs_aops = {
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.set_page_dirty = hugetlbfs_set_page_dirty,
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};
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static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
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{
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struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR)
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inode_init_once(&ei->vfs_inode);
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}
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struct file_operations hugetlbfs_file_operations = {
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.mmap = hugetlbfs_file_mmap,
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.fsync = simple_sync_file,
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