diff options
Diffstat (limited to 'fs')
109 files changed, 10486 insertions, 12845 deletions
diff --git a/fs/inode.c b/fs/inode.c index 0487ddba1397..098a2443196f 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -108,84 +108,100 @@ static void wake_up_inode(struct inode *inode) wake_up_bit(&inode->i_state, __I_LOCK); } -static struct inode *alloc_inode(struct super_block *sb) +/** + * inode_init_always - perform inode structure intialisation + * @sb - superblock inode belongs to. + * @inode - inode to initialise + * + * These are initializations that need to be done on every inode + * allocation as the fields are not initialised by slab allocation. + */ +struct inode *inode_init_always(struct super_block *sb, struct inode *inode) { static const struct address_space_operations empty_aops; static struct inode_operations empty_iops; static const struct file_operations empty_fops; - struct inode *inode; - - if (sb->s_op->alloc_inode) - inode = sb->s_op->alloc_inode(sb); - else - inode = (struct inode *) kmem_cache_alloc(inode_cachep, GFP_KERNEL); - if (inode) { - struct address_space * const mapping = &inode->i_data; - - inode->i_sb = sb; - inode->i_blkbits = sb->s_blocksize_bits; - inode->i_flags = 0; - atomic_set(&inode->i_count, 1); - inode->i_op = &empty_iops; - inode->i_fop = &empty_fops; - inode->i_nlink = 1; - atomic_set(&inode->i_writecount, 0); - inode->i_size = 0; - inode->i_blocks = 0; - inode->i_bytes = 0; - inode->i_generation = 0; + struct address_space * const mapping = &inode->i_data; + + inode->i_sb = sb; + inode->i_blkbits = sb->s_blocksize_bits; + inode->i_flags = 0; + atomic_set(&inode->i_count, 1); + inode->i_op = &empty_iops; + inode->i_fop = &empty_fops; + inode->i_nlink = 1; + atomic_set(&inode->i_writecount, 0); + inode->i_size = 0; + inode->i_blocks = 0; + inode->i_bytes = 0; + inode->i_generation = 0; #ifdef CONFIG_QUOTA - memset(&inode->i_dquot, 0, sizeof(inode->i_dquot)); + memset(&inode->i_dquot, 0, sizeof(inode->i_dquot)); #endif - inode->i_pipe = NULL; - inode->i_bdev = NULL; - inode->i_cdev = NULL; - inode->i_rdev = 0; - inode->dirtied_when = 0; - if (security_inode_alloc(inode)) { - if (inode->i_sb->s_op->destroy_inode) - inode->i_sb->s_op->destroy_inode(inode); - else - kmem_cache_free(inode_cachep, (inode)); - return NULL; - } + inode->i_pipe = NULL; + inode->i_bdev = NULL; + inode->i_cdev = NULL; + inode->i_rdev = 0; + inode->dirtied_when = 0; + if (security_inode_alloc(inode)) { + if (inode->i_sb->s_op->destroy_inode) + inode->i_sb->s_op->destroy_inode(inode); + else + kmem_cache_free(inode_cachep, (inode)); + return NULL; + } - spin_lock_init(&inode->i_lock); - lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key); + spin_lock_init(&inode->i_lock); + lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key); - mutex_init(&inode->i_mutex); - lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key); + mutex_init(&inode->i_mutex); + lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key); - init_rwsem(&inode->i_alloc_sem); - lockdep_set_class(&inode->i_alloc_sem, &sb->s_type->i_alloc_sem_key); + init_rwsem(&inode->i_alloc_sem); + lockdep_set_class(&inode->i_alloc_sem, &sb->s_type->i_alloc_sem_key); - mapping->a_ops = &empty_aops; - mapping->host = inode; - mapping->flags = 0; - mapping_set_gfp_mask(mapping, GFP_HIGHUSER_PAGECACHE); - mapping->assoc_mapping = NULL; - mapping->backing_dev_info = &default_backing_dev_info; - mapping->writeback_index = 0; + mapping->a_ops = &empty_aops; + mapping->host = inode; + mapping->flags = 0; + mapping_set_gfp_mask(mapping, GFP_HIGHUSER_PAGECACHE); + mapping->assoc_mapping = NULL; + mapping->backing_dev_info = &default_backing_dev_info; + mapping->writeback_index = 0; - /* - * If the block_device provides a backing_dev_info for client - * inodes then use that. Otherwise the inode share the bdev's - * backing_dev_info. - */ - if (sb->s_bdev) { - struct backing_dev_info *bdi; + /* + * If the block_device provides a backing_dev_info for client + * inodes then use that. Otherwise the inode share the bdev's + * backing_dev_info. + */ + if (sb->s_bdev) { + struct backing_dev_info *bdi; - bdi = sb->s_bdev->bd_inode_backing_dev_info; - if (!bdi) - bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; - mapping->backing_dev_info = bdi; - } - inode->i_private = NULL; - inode->i_mapping = mapping; + bdi = sb->s_bdev->bd_inode_backing_dev_info; + if (!bdi) + bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; + mapping->backing_dev_info = bdi; } + inode->i_private = NULL; + inode->i_mapping = mapping; + return inode; } +EXPORT_SYMBOL(inode_init_always); + +static struct inode *alloc_inode(struct super_block *sb) +{ + struct inode *inode; + + if (sb->s_op->alloc_inode) + inode = sb->s_op->alloc_inode(sb); + else + inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL); + + if (inode) + return inode_init_always(sb, inode); + return NULL; +} void destroy_inode(struct inode *inode) { @@ -196,6 +212,7 @@ void destroy_inode(struct inode *inode) else kmem_cache_free(inode_cachep, (inode)); } +EXPORT_SYMBOL(destroy_inode); /* @@ -534,6 +551,49 @@ repeat: return node ? inode : NULL; } +static unsigned long hash(struct super_block *sb, unsigned long hashval) +{ + unsigned long tmp; + + tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / + L1_CACHE_BYTES; + tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS); + return tmp & I_HASHMASK; +} + +static inline void +__inode_add_to_lists(struct super_block *sb, struct hlist_head *head, + struct inode *inode) +{ + inodes_stat.nr_inodes++; + list_add(&inode->i_list, &inode_in_use); + list_add(&inode->i_sb_list, &sb->s_inodes); + if (head) + hlist_add_head(&inode->i_hash, head); +} + +/** + * inode_add_to_lists - add a new inode to relevant lists + * @sb - superblock inode belongs to. + * @inode - inode to mark in use + * + * When an inode is allocated it needs to be accounted for, added to the in use + * list, the owning superblock and the inode hash. This needs to be done under + * the inode_lock, so export a function to do this |