On December 31, 2001 07:16 pm, Linus Torvalds wrote:
> How about using a descriptor structure instead of the macro, and making
> the filesystem declaration syntax look more like
>
> static struct file_system_type ext2_descriptor = {
> owner: THIS_MODULE,
> fs_flags: FS_REQUIRES_DEV,
> name: "ext2",
> read_super: ext2_read_super,
> super_size: sizeof(ext2_sb_info),
^^^^^---> changed sb to super, lines up better
> inode_size: sizeof(struct ext2_inode_info)
> };
>
> which is more readable, and inherently documents _what_ those things are.
>
> [snip halfway macro format]
>
> What do you think?
It's much nicer, here's (1 of 3) again, with the Linus-style ext2_fs
declaration.
-- Daniel--- ../2.4.16.uml.clean/arch/um/fs/hostfs/hostfs_kern.c Mon Dec 31 03:15:49 2001 +++ ./arch/um/fs/hostfs/hostfs_kern.c Mon Dec 31 18:28:57 2001 @@ -378,7 +378,7 @@ char *name; int type, err = 0, rdev; - inode = get_empty_inode(); + inode = get_empty_inode(sb); if(inode == NULL) return(NULL); inode->u.hostfs_i.host_filename = NULL; inode->u.hostfs_i.fd = -1; @@ -395,7 +395,6 @@ kfree(name); } else type = HOSTFS_DIR; - inode->i_sb = sb; if(type == HOSTFS_SYMLINK) inode->i_op = &page_symlink_inode_operations; --- ../2.4.16.uml.clean/drivers/block/rd.c Mon Dec 31 02:55:36 2001 +++ ./drivers/block/rd.c Mon Dec 31 18:28:57 2001 @@ -673,7 +673,7 @@ #endif ram_device = MKDEV(MAJOR_NR, unit); - if ((inode = get_empty_inode()) == NULL) + if ((inode = get_empty_inode(NULL)) == NULL) return; memset(&infile, 0, sizeof(infile)); memset(&in_dentry, 0, sizeof(in_dentry)); @@ -683,7 +683,7 @@ infile.f_op = &def_blk_fops; init_special_inode(inode, S_IFBLK | S_IRUSR, kdev_t_to_nr(device)); - if ((out_inode = get_empty_inode()) == NULL) + if ((out_inode = get_empty_inode(NULL)) == NULL) goto free_inode; memset(&outfile, 0, sizeof(outfile)); memset(&out_dentry, 0, sizeof(out_dentry)); --- ../2.4.16.uml.clean/fs/ext2/super.c Sun Dec 30 10:15:56 2001 +++ ./fs/ext2/super.c Mon Dec 31 19:19:01 2001 @@ -798,16 +798,23 @@ return 0; } -static DECLARE_FSTYPE_DEV(ext2_fs_type, "ext2", ext2_read_super); - +static struct file_system_type ext2_fs = { + owner: THIS_MODULE, + fs_flags: FS_REQUIRES_DEV, + name: "ext2", + read_super: ext2_read_super, + super_size: sizeof(struct ext2_sb_info), + inode_size: sizeof(struct ext2_inode_info) +}; + static int __init init_ext2_fs(void) { - return register_filesystem(&ext2_fs_type); + return register_filesystem(&ext2_fs); } static void __exit exit_ext2_fs(void) { - unregister_filesystem(&ext2_fs_type); + unregister_filesystem(&ext2_fs); } EXPORT_NO_SYMBOLS; --- ../2.4.16.uml.clean/fs/inode.c Mon Dec 31 02:55:36 2001 +++ ./fs/inode.c Mon Dec 31 18:53:23 2001 @@ -75,16 +75,23 @@ static kmem_cache_t * inode_cachep; -#define alloc_inode() \ - ((struct inode *) kmem_cache_alloc(inode_cachep, SLAB_KERNEL)) -static void destroy_inode(struct inode *inode) +int foo_count; + +static inline struct inode *alloc_inode (struct super_block *sb) { + kmem_cache_t *cache = sb? sb->s_type->inode_cache: NULL; + return (struct inode *) kmem_cache_alloc (cache? cache: inode_cachep, SLAB_KERNEL); +} + +static void destroy_inode (struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + kmem_cache_t *cache = sb? sb->s_type->inode_cache: NULL; if (inode_has_buffers(inode)) BUG(); - kmem_cache_free(inode_cachep, (inode)); + kmem_cache_free (cache? cache: inode_cachep, inode); } - /* * These are initializations that only need to be done * once, because the fields are idempotent across use @@ -661,7 +668,7 @@ !inode_has_buffers(inode)) #define INODE(entry) (list_entry(entry, struct inode, i_list)) -void prune_icache(int goal) +void prune_icache (int goal) { LIST_HEAD(list); struct list_head *entry, *freeable = &list; @@ -710,6 +717,7 @@ int shrink_icache_memory(int priority, int gfp_mask) { + struct file_system_type *fs; int count = 0; /* @@ -725,7 +733,15 @@ count = inodes_stat.nr_unused / priority; prune_icache(count); +#if 0 + /* Manfred thinks this isn't necessary */ kmem_cache_shrink(inode_cachep); + write_lock(&file_systems_lock); + for (fs = file_systems; fs; fs = fs->next) + kmem_cache_shrink (fs->inode_cache); + write_unlock(&file_systems_lock); + kmem_cache_shrink(inode_cachep); +#endif return 0; } @@ -765,12 +781,14 @@ * i_sb, i_ino, i_count, i_state and the lists have * been initialized elsewhere.. */ -static void clean_inode(struct inode *inode) +static void clean_inode (struct super_block *sb, struct inode *inode) { static struct address_space_operations empty_aops; static struct inode_operations empty_iops; static struct file_operations empty_fops; - memset(&inode->u, 0, sizeof(inode->u)); + unsigned given = sb? sb->s_type->inode_size: 0; // only rd.c has null sb + memset(&inode->u, 0, given? given: sizeof(inode->u)); + inode->i_sb = sb; inode->i_sock = 0; inode->i_op = &empty_iops; inode->i_fop = &empty_fops; @@ -802,20 +820,19 @@ * lists. */ -struct inode * get_empty_inode(void) +struct inode *get_empty_inode (struct super_block *sb) { static unsigned long last_ino; - struct inode * inode; + struct inode *inode; spin_lock_prefetch(&inode_lock); - - inode = alloc_inode(); + inode = alloc_inode (sb); if (inode) { spin_lock(&inode_lock); inodes_stat.nr_inodes++; list_add(&inode->i_list, &inode_in_use); - inode->i_sb = NULL; + inode->i_sb = NULL; // need this? inode->i_dev = 0; inode->i_blkbits = 0; inode->i_ino = ++last_ino; @@ -823,7 +840,7 @@ atomic_set(&inode->i_count, 1); inode->i_state = 0; spin_unlock(&inode_lock); - clean_inode(inode); + clean_inode(sb, inode); } return inode; } @@ -838,7 +855,7 @@ { struct inode * inode; - inode = alloc_inode(); + inode = alloc_inode (sb); if (inode) { struct inode * old; @@ -849,7 +866,6 @@ inodes_stat.nr_inodes++; list_add(&inode->i_list, &inode_in_use); list_add(&inode->i_hash, head); - inode->i_sb = sb; inode->i_dev = sb->s_dev; inode->i_blkbits = sb->s_blocksize_bits; inode->i_ino = ino; @@ -857,8 +873,7 @@ atomic_set(&inode->i_count, 1); inode->i_state = I_LOCK; spin_unlock(&inode_lock); - - clean_inode(inode); + clean_inode(sb, inode); /* reiserfs specific hack right here. We don't ** want this to last, and are looking for VFS changes @@ -897,6 +912,22 @@ wait_on_inode(inode); } return inode; +} + +int create_inode_cache (struct file_system_type *fs) +{ + if (fs->inode_size) + if (!(fs->inode_cache = kmem_cache_create (fs->name, + fs->inode_size + sizeof(struct inode) - sizeof(get_empty_inode(0)->u), + 0, SLAB_HWCACHE_ALIGN, init_once, NULL))) + return -ENOSPC; + return 0; +} + +int destroy_inode_cache (struct file_system_type *fs) +{ + printk("Destroying inode cache for %s\n", fs->name); + return kmem_cache_destroy (fs->inode_cache)? -EBUSY: 0; } static inline unsigned long hash(struct super_block *sb, unsigned long i_ino) --- ../2.4.16.uml.clean/fs/super.c Mon Dec 31 02:55:36 2001 +++ ./fs/super.c Mon Dec 31 18:28:57 2001 @@ -67,8 +67,8 @@ * Once the reference is obtained we can drop the spinlock. */ -static struct file_system_type *file_systems; -static rwlock_t file_systems_lock = RW_LOCK_UNLOCKED; +struct file_system_type *file_systems; +rwlock_t file_systems_lock = RW_LOCK_UNLOCKED; /* WARNING: This can be used only if we _already_ own a reference */ static void get_filesystem(struct file_system_type *fs) @@ -105,10 +105,10 @@ * unregistered. */ -int register_filesystem(struct file_system_type * fs) +int register_filesystem (struct file_system_type *fs) { - int res = 0; - struct file_system_type ** p; + struct file_system_type **p; + int err = 0; if (!fs) return -EINVAL; @@ -118,11 +118,12 @@ write_lock(&file_systems_lock); p = find_filesystem(fs->name); if (*p) - res = -EBUSY; + err = -EBUSY; else - *p = fs; + if (!(err = create_inode_cache (fs))) + *p = fs; write_unlock(&file_systems_lock); - return res; + return err; } /** @@ -137,23 +138,25 @@ * may be freed or reused. */ -int unregister_filesystem(struct file_system_type * fs) +int unregister_filesystem (struct file_system_type *fs) { - struct file_system_type ** tmp; - + struct file_system_type **p; + int err = -EINVAL; write_lock(&file_systems_lock); - tmp = &file_systems; - while (*tmp) { - if (fs == *tmp) { - *tmp = fs->next; + p = &file_systems; + while (*p) { + if (*p == fs) { + if (fs->inode_cache && (err = destroy_inode_cache (fs))) + break; + *p = fs->next; fs->next = NULL; - write_unlock(&file_systems_lock); - return 0; + err = 0; + break; } - tmp = &(*tmp)->next; + p = &(*p)->next; } write_unlock(&file_systems_lock); - return -EINVAL; + return err; } static int fs_index(const char * __name) --- ../2.4.16.uml.clean/include/linux/fs.h Mon Dec 31 02:55:36 2001 +++ ./include/linux/fs.h Mon Dec 31 18:50:45 2001 @@ -693,6 +693,9 @@ #include <linux/cramfs_fs_sb.h> #include <linux/jffs2_fs_sb.h> +extern struct file_system_type *file_systems; +extern rwlock_t file_systems_lock; + extern struct list_head super_blocks; extern spinlock_t sb_lock; @@ -950,10 +953,14 @@ int fs_flags; struct super_block *(*read_super) (struct super_block *, void *, int); struct module *owner; - struct file_system_type * next; + struct file_system_type *next; struct list_head fs_supers; + unsigned super_size, inode_size; + struct kmem_cache_s *inode_cache; }; +/* Backward compatible declarations, remove when all updated */ + #define DECLARE_FSTYPE(var,type,read,flags) \ struct file_system_type var = { \ name: type, \ @@ -1327,18 +1334,21 @@ } extern void clear_inode(struct inode *); -extern struct inode * get_empty_inode(void); +extern struct inode *get_empty_inode (struct super_block *sb); -static inline struct inode * new_inode(struct super_block *sb) +static inline struct inode *new_inode (struct super_block *sb) { - struct inode *inode = get_empty_inode(); + struct inode *inode = get_empty_inode(sb); if (inode) { - inode->i_sb = sb; inode->i_dev = sb->s_dev; inode->i_blkbits = sb->s_blocksize_bits; } return inode; } + +int create_inode_cache (struct file_system_type *fs); +int destroy_inode_cache (struct file_system_type *fs); + extern void remove_suid(struct inode *inode); extern void insert_inode_hash(struct inode *); --- ../2.4.16.uml.clean/net/socket.c Mon Dec 31 02:55:36 2001 +++ ./net/socket.c Mon Dec 31 18:28:58 2001 @@ -440,11 +440,10 @@ struct inode * inode; struct socket * sock; - inode = get_empty_inode(); + inode = get_empty_inode(sock_mnt->mnt_sb); if (!inode) return NULL; - inode->i_sb = sock_mnt->mnt_sb; sock = socki_lookup(inode); inode->i_mode = S_IFSOCK|S_IRWXUGO; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Dec 31 2001 - 21:00:25 EST