Commit 96527980 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds

[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: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent b8072f09
...@@ -224,8 +224,6 @@ static void truncate_hugepages(struct address_space *mapping, loff_t lstart) ...@@ -224,8 +224,6 @@ static void truncate_hugepages(struct address_space *mapping, loff_t lstart)
static void hugetlbfs_delete_inode(struct inode *inode) static void hugetlbfs_delete_inode(struct inode *inode)
{ {
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(inode->i_sb);
hlist_del_init(&inode->i_hash); hlist_del_init(&inode->i_hash);
list_del_init(&inode->i_list); list_del_init(&inode->i_list);
list_del_init(&inode->i_sb_list); list_del_init(&inode->i_sb_list);
...@@ -238,12 +236,6 @@ static void hugetlbfs_delete_inode(struct inode *inode) ...@@ -238,12 +236,6 @@ static void hugetlbfs_delete_inode(struct inode *inode)
security_inode_delete(inode); security_inode_delete(inode);
if (sbinfo->free_inodes >= 0) {
spin_lock(&sbinfo->stat_lock);
sbinfo->free_inodes++;
spin_unlock(&sbinfo->stat_lock);
}
clear_inode(inode); clear_inode(inode);
destroy_inode(inode); destroy_inode(inode);
} }
...@@ -251,7 +243,6 @@ static void hugetlbfs_delete_inode(struct inode *inode) ...@@ -251,7 +243,6 @@ static void hugetlbfs_delete_inode(struct inode *inode)
static void hugetlbfs_forget_inode(struct inode *inode) static void hugetlbfs_forget_inode(struct inode *inode)
{ {
struct super_block *super_block = inode->i_sb; struct super_block *super_block = inode->i_sb;
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(super_block);
if (hlist_unhashed(&inode->i_hash)) if (hlist_unhashed(&inode->i_hash))
goto out_truncate; goto out_truncate;
...@@ -278,12 +269,6 @@ static void hugetlbfs_forget_inode(struct inode *inode) ...@@ -278,12 +269,6 @@ static void hugetlbfs_forget_inode(struct inode *inode)
if (inode->i_data.nrpages) if (inode->i_data.nrpages)
truncate_hugepages(&inode->i_data, 0); truncate_hugepages(&inode->i_data, 0);
if (sbinfo->free_inodes >= 0) {
spin_lock(&sbinfo->stat_lock);
sbinfo->free_inodes++;
spin_unlock(&sbinfo->stat_lock);
}
clear_inode(inode); clear_inode(inode);
destroy_inode(inode); destroy_inode(inode);
} }
...@@ -375,17 +360,6 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid, ...@@ -375,17 +360,6 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, uid_t uid,
gid_t gid, int mode, dev_t dev) gid_t gid, int mode, dev_t dev)
{ {
struct inode *inode; struct inode *inode;
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
if (sbinfo->free_inodes >= 0) {
spin_lock(&sbinfo->stat_lock);
if (!sbinfo->free_inodes) {
spin_unlock(&sbinfo->stat_lock);
return NULL;
}
sbinfo->free_inodes--;
spin_unlock(&sbinfo->stat_lock);
}
inode = new_inode(sb); inode = new_inode(sb);
if (inode) { if (inode) {
...@@ -527,29 +501,51 @@ static void hugetlbfs_put_super(struct super_block *sb) ...@@ -527,29 +501,51 @@ static void hugetlbfs_put_super(struct super_block *sb)
} }
} }
static inline int hugetlbfs_dec_free_inodes(struct hugetlbfs_sb_info *sbinfo)
{
if (sbinfo->free_inodes >= 0) {
spin_lock(&sbinfo->stat_lock);
if (unlikely(!sbinfo->free_inodes)) {
spin_unlock(&sbinfo->stat_lock);
return 0;
}
sbinfo->free_inodes--;
spin_unlock(&sbinfo->stat_lock);
}
return 1;
}
static void hugetlbfs_inc_free_inodes(struct hugetlbfs_sb_info *sbinfo)
{
if (sbinfo->free_inodes >= 0) {
spin_lock(&sbinfo->stat_lock);
sbinfo->free_inodes++;
spin_unlock(&sbinfo->stat_lock);
}
}
static kmem_cache_t *hugetlbfs_inode_cachep; static kmem_cache_t *hugetlbfs_inode_cachep;
static struct inode *hugetlbfs_alloc_inode(struct super_block *sb) static struct inode *hugetlbfs_alloc_inode(struct super_block *sb)
{ {
struct hugetlbfs_sb_info *sbinfo = HUGETLBFS_SB(sb);
struct hugetlbfs_inode_info *p; struct hugetlbfs_inode_info *p;
if (unlikely(!hugetlbfs_dec_free_inodes(sbinfo)))
return NULL;
p = kmem_cache_alloc(hugetlbfs_inode_cachep, SLAB_KERNEL); p = kmem_cache_alloc(hugetlbfs_inode_cachep, SLAB_KERNEL);
if (!p) if (unlikely(!p)) {
hugetlbfs_inc_free_inodes(sbinfo);
return NULL; return NULL;
}
return &p->vfs_inode; return &p->vfs_inode;
} }
static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
{
struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&ei->vfs_inode);
}
static void hugetlbfs_destroy_inode(struct inode *inode) static void hugetlbfs_destroy_inode(struct inode *inode)
{ {
hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy); mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode)); kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
} }
...@@ -561,6 +557,16 @@ static struct address_space_operations hugetlbfs_aops = { ...@@ -561,6 +557,16 @@ static struct address_space_operations hugetlbfs_aops = {
.set_page_dirty = hugetlbfs_set_page_dirty, .set_page_dirty = hugetlbfs_set_page_dirty,
}; };
static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
{
struct hugetlbfs_inode_info *ei = (struct hugetlbfs_inode_info *)foo;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&ei->vfs_inode);
}
struct file_operations hugetlbfs_file_operations = { struct file_operations hugetlbfs_file_operations = {
.mmap = hugetlbfs_file_mmap, .mmap = hugetlbfs_file_mmap,
.fsync = simple_sync_file, .fsync = simple_sync_file,
......
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