| /* |
| * |
| * Copyright (c) International Business Machines Corp., 2000 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| * the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/locks.h> |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <asm/uaccess.h> |
| #include "jfs_incore.h" |
| #include "jfs_filsys.h" |
| #include "jfs_metapage.h" |
| #include "jfs_superblock.h" |
| #include "jfs_dmap.h" |
| #include "jfs_imap.h" |
| #include "jfs_debug.h" |
| |
| MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); |
| MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); |
| MODULE_LICENSE("GPL"); |
| |
| static kmem_cache_t * jfs_inode_cachep; |
| |
| static int in_shutdown; |
| static pid_t jfsIOthread; |
| static pid_t jfsCommitThread; |
| static pid_t jfsSyncThread; |
| struct task_struct *jfsIOtask; |
| struct task_struct *jfsCommitTask; |
| struct task_struct *jfsSyncTask; |
| DECLARE_COMPLETION(jfsIOwait); |
| |
| #ifdef CONFIG_JFS_DEBUG |
| int jfsloglevel = 1; |
| MODULE_PARM(jfsloglevel, "i"); |
| MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); |
| #endif |
| |
| /* |
| * External declarations |
| */ |
| extern int jfs_mount(struct super_block *); |
| extern int jfs_mount_rw(struct super_block *, int); |
| extern int jfs_umount(struct super_block *); |
| extern int jfs_umount_rw(struct super_block *); |
| |
| extern int jfsIOWait(void *); |
| extern int jfs_lazycommit(void *); |
| extern int jfs_sync(void *); |
| extern void jfs_put_inode(struct inode *inode); |
| extern void jfs_read_inode(struct inode *inode); |
| extern void jfs_dirty_inode(struct inode *inode); |
| extern void jfs_delete_inode(struct inode *inode); |
| extern void jfs_write_inode(struct inode *inode, int wait); |
| |
| #if defined(CONFIG_JFS_DEBUG) && defined(CONFIG_PROC_FS) |
| extern void jfs_proc_init(void); |
| extern void jfs_proc_clean(void); |
| #endif |
| |
| int jfs_thread_stopped(void) |
| { |
| unsigned long signr; |
| siginfo_t info; |
| |
| spin_lock_irq(¤t->sigmask_lock); |
| signr = dequeue_signal(¤t->blocked, &info); |
| spin_unlock_irq(¤t->sigmask_lock); |
| |
| if (signr == SIGKILL && in_shutdown) |
| return 1; |
| return 0; |
| } |
| |
| static struct inode *jfs_alloc_inode(struct super_block *sb) |
| { |
| struct jfs_inode_info *jfs_inode; |
| |
| jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); |
| if (!jfs_inode) |
| return NULL; |
| return &jfs_inode->vfs_inode; |
| } |
| |
| static void jfs_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(jfs_inode_cachep, JFS_IP(inode)); |
| } |
| |
| static int jfs_statfs(struct super_block *sb, struct statfs *buf) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| s64 maxinodes; |
| imap_t *imap = JFS_IP(sbi->ipimap)->i_imap; |
| |
| jFYI(1, ("In jfs_statfs\n")); |
| buf->f_type = JFS_SUPER_MAGIC; |
| buf->f_bsize = sbi->bsize; |
| buf->f_blocks = sbi->bmap->db_mapsize; |
| buf->f_bfree = sbi->bmap->db_nfree; |
| buf->f_bavail = sbi->bmap->db_nfree; |
| /* |
| * If we really return the number of allocated & free inodes, some |
| * applications will fail because they won't see enough free inodes. |
| * We'll try to calculate some guess as to how may inodes we can |
| * really allocate |
| * |
| * buf->f_files = atomic_read(&imap->im_numinos); |
| * buf->f_ffree = atomic_read(&imap->im_numfree); |
| */ |
| maxinodes = min((s64) atomic_read(&imap->im_numinos) + |
| ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) |
| << L2INOSPEREXT), (s64)0xffffffffLL); |
| buf->f_files = maxinodes; |
| buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - |
| atomic_read(&imap->im_numfree)); |
| |
| buf->f_namelen = JFS_NAME_MAX; |
| return 0; |
| } |
| |
| static void jfs_put_super(struct super_block *sb) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| int rc; |
| |
| jFYI(1, ("In jfs_put_super\n")); |
| rc = jfs_umount(sb); |
| if (rc) { |
| jERROR(1, ("jfs_umount failed with return code %d\n", rc)); |
| } |
| unload_nls(sbi->nls_tab); |
| sbi->nls_tab = NULL; |
| |
| /* |
| * We need to clean out the direct_inode pages since this inode |
| * is not in the inode hash. |
| */ |
| fsync_inode_data_buffers(sbi->direct_inode); |
| truncate_inode_pages(sbi->direct_mapping, 0); |
| iput(sbi->direct_inode); |
| sbi->direct_inode = NULL; |
| sbi->direct_mapping = NULL; |
| |
| JFS_SBI(sb) = 0; |
| kfree(sbi); |
| } |
| |
| static int parse_options (char * options, struct jfs_sb_info *sbi) |
| { |
| void *nls_map = NULL; |
| char * this_char; |
| char * value; |
| |
| if (!options) |
| return 1; |
| for (this_char = strtok (options, ","); |
| this_char != NULL; |
| this_char = strtok (NULL, ",")) { |
| if ((value = strchr (this_char, '=')) != NULL) |
| *value++ = 0; |
| if (!strcmp (this_char, "iocharset")) { |
| if (!value || !*value) |
| goto needs_arg; |
| if (nls_map) /* specified iocharset twice! */ |
| unload_nls(nls_map); |
| nls_map = load_nls(value); |
| if (!nls_map) { |
| printk(KERN_ERR "JFS: charset not found\n"); |
| goto cleanup; |
| } |
| /* Silently ignore the quota options */ |
| } else if (!strcmp (this_char, "grpquota") |
| || !strcmp (this_char, "noquota") |
| || !strcmp (this_char, "quota") |
| || !strcmp (this_char, "usrquota")) |
| /* Don't do anything ;-) */ ; |
| else { |
| printk ("jfs: Unrecognized mount option %s\n", this_char); |
| goto cleanup; |
| } |
| } |
| if (nls_map) { |
| /* Discard old (if remount) */ |
| if (sbi->nls_tab) |
| unload_nls(sbi->nls_tab); |
| sbi->nls_tab = nls_map; |
| } |
| return 1; |
| needs_arg: |
| printk(KERN_ERR "JFS: %s needs an argument\n", this_char); |
| cleanup: |
| if (nls_map) |
| unload_nls(nls_map); |
| return 0; |
| } |
| |
| int jfs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| |
| if (!parse_options(data, sbi)) { |
| return -EINVAL; |
| } |
| |
| if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
| /* |
| * Invalidate any previously read metadata. fsck may |
| * have changed the on-disk data since we mounted r/o |
| */ |
| truncate_inode_pages(sbi->direct_mapping, 0); |
| |
| return jfs_mount_rw(sb, 1); |
| } else if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) |
| return jfs_umount_rw(sb); |
| |
| return 0; |
| } |
| |
| static struct super_operations jfs_sops = { |
| alloc_inode: jfs_alloc_inode, |
| destroy_inode: jfs_destroy_inode, |
| read_inode: jfs_read_inode, |
| dirty_inode: jfs_dirty_inode, |
| write_inode: jfs_write_inode, |
| put_inode: jfs_put_inode, |
| delete_inode: jfs_delete_inode, |
| put_super: jfs_put_super, |
| statfs: jfs_statfs, |
| remount_fs: jfs_remount, |
| }; |
| |
| static int jfs_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct jfs_sb_info *sbi; |
| struct inode *inode; |
| int rc; |
| |
| jFYI(1, ("In jfs_read_super: s_flags=0x%lx\n", sb->s_flags)); |
| |
| sbi = kmalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); |
| JFS_SBI(sb) = sbi; |
| if (!sbi) |
| return -ENOSPC; |
| memset(sbi, 0, sizeof(struct jfs_sb_info)); |
| |
| if (!parse_options((char *)data, sbi)) { |
| kfree(sbi); |
| return -EINVAL; |
| } |
| |
| /* |
| * Initialize blocksize to 4K. |
| */ |
| sb->s_blocksize = PSIZE; |
| sb->s_blocksize_bits = L2PSIZE; |
| set_blocksize(sb->s_dev, PSIZE); |
| |
| sb->s_op = &jfs_sops; |
| /* |
| * Initialize direct-mapping inode/address-space |
| */ |
| inode = new_inode(sb); |
| if (inode == NULL) |
| goto out_kfree; |
| inode->i_ino = 0; |
| inode->i_nlink = 1; |
| inode->i_size = 0x0000010000000000LL; |
| inode->i_mapping->a_ops = &direct_aops; |
| inode->i_mapping->gfp_mask = GFP_NOFS; |
| |
| sbi->direct_inode = inode; |
| sbi->direct_mapping = inode->i_mapping; |
| |
| rc = jfs_mount(sb); |
| if (rc) { |
| if (!silent) { |
| jERROR(1, |
| ("jfs_mount failed w/return code = %d\n", |
| rc)); |
| } |
| goto out_mount_failed; |
| } |
| if (sb->s_flags & MS_RDONLY) |
| sbi->log = 0; |
| else { |
| rc = jfs_mount_rw(sb, 0); |
| if (rc) { |
| if (!silent) { |
| jERROR(1, |
| ("jfs_mount_rw failed w/return code = %d\n", |
| rc)); |
| } |
| goto out_no_rw; |
| } |
| } |
| |
| sb->s_magic = JFS_SUPER_MAGIC; |
| |
| inode = iget(sb, ROOT_I); |
| if (!inode || is_bad_inode(inode)) |
| goto out_no_root; |
| sb->s_root = d_alloc_root(inode); |
| if (!sb->s_root) |
| goto out_no_root; |
| |
| if (!sbi->nls_tab) |
| sbi->nls_tab = load_nls_default(); |
| |
| sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; |
| #if BITS_PER_LONG == 32 |
| sb->s_maxbytes = min((u64)PAGE_CACHE_SIZE << 32, sb->s_maxbytes); |
| #endif |
| |
| return 0; |
| |
| out_no_root: |
| jEVENT(1, ("jfs_read_super: get root inode failed\n")); |
| if (inode) |
| iput(inode); |
| |
| out_no_rw: |
| rc = jfs_umount(sb); |
| if (rc) { |
| jERROR(1, ("jfs_umount failed with return code %d\n", rc)); |
| } |
| out_mount_failed: |
| fsync_inode_data_buffers(sbi->direct_inode); |
| truncate_inode_pages(sbi->direct_mapping, 0); |
| make_bad_inode(sbi->direct_inode); |
| iput(sbi->direct_inode); |
| sbi->direct_inode = NULL; |
| sbi->direct_mapping = NULL; |
| out_kfree: |
| if (sbi->nls_tab) |
| unload_nls(sbi->nls_tab); |
| kfree(sbi); |
| return -EINVAL; |
| } |
| |
| static struct super_block *jfs_get_sb(struct file_system_type *fs_type, |
| int flags, char *dev_name, void *data) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super); |
| } |
| |
| static struct file_system_type jfs_fs_type = { |
| owner: THIS_MODULE, |
| name: "jfs", |
| get_sb: jfs_get_sb, |
| fs_flags: FS_REQUIRES_DEV, |
| }; |
| |
| extern int metapage_init(void); |
| extern int txInit(void); |
| extern void txExit(void); |
| extern void metapage_exit(void); |
| |
| static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| { |
| struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; |
| |
| if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| SLAB_CTOR_CONSTRUCTOR) { |
| INIT_LIST_HEAD(&jfs_ip->anon_inode_list); |
| INIT_LIST_HEAD(&jfs_ip->mp_list); |
| RDWRLOCK_INIT(&jfs_ip->rdwrlock); |
| inode_init_once(&jfs_ip->vfs_inode); |
| } |
| } |
| |
| static int __init init_jfs_fs(void) |
| { |
| int rc; |
| |
| jfs_inode_cachep = |
| kmem_cache_create("jfs_ip", |
| sizeof(struct jfs_inode_info), |
| 0, 0, init_once, NULL); |
| if (jfs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| /* |
| * Metapage initialization |
| */ |
| rc = metapage_init(); |
| if (rc) { |
| jERROR(1, ("metapage_init failed w/rc = %d\n", rc)); |
| goto free_slab; |
| } |
| |
| /* |
| * Transaction Manager initialization |
| */ |
| rc = txInit(); |
| if (rc) { |
| jERROR(1, ("txInit failed w/rc = %d\n", rc)); |
| goto free_metapage; |
| } |
| |
| /* |
| * I/O completion thread (endio) |
| */ |
| jfsIOthread = kernel_thread(jfsIOWait, 0, |
| CLONE_FS | CLONE_FILES | |
| CLONE_SIGHAND); |
| if (jfsIOthread < 0) { |
| jERROR(1, |
| ("init_jfs_fs: fork failed w/rc = %d\n", |
| jfsIOthread)); |
| goto end_txmngr; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until IO thread starts */ |
| |
| jfsCommitThread = kernel_thread(jfs_lazycommit, 0, |
| CLONE_FS | CLONE_FILES | |
| CLONE_SIGHAND); |
| if (jfsCommitThread < 0) { |
| jERROR(1, |
| ("init_jfs_fs: fork failed w/rc = %d\n", |
| jfsCommitThread)); |
| goto kill_iotask; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until IO thread starts */ |
| |
| jfsSyncThread = kernel_thread(jfs_sync, 0, |
| CLONE_FS | CLONE_FILES | |
| CLONE_SIGHAND); |
| if (jfsSyncThread < 0) { |
| jERROR(1, |
| ("init_jfs_fs: fork failed w/rc = %d\n", |
| jfsSyncThread)); |
| goto kill_committask; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until IO thread starts */ |
| |
| #if defined(CONFIG_JFS_DEBUG) && defined(CONFIG_PROC_FS) |
| jfs_proc_init(); |
| #endif |
| |
| return register_filesystem(&jfs_fs_type); |
| |
| |
| kill_committask: |
| send_sig(SIGKILL, jfsCommitTask, 1); |
| wait_for_completion(&jfsIOwait); /* Wait until Commit thread exits */ |
| kill_iotask: |
| send_sig(SIGKILL, jfsIOtask, 1); |
| wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */ |
| end_txmngr: |
| txExit(); |
| free_metapage: |
| metapage_exit(); |
| free_slab: |
| kmem_cache_destroy(jfs_inode_cachep); |
| return -rc; |
| } |
| |
| static void __exit exit_jfs_fs(void) |
| { |
| jFYI(1, ("exit_jfs_fs called\n")); |
| |
| in_shutdown = 1; |
| txExit(); |
| metapage_exit(); |
| send_sig(SIGKILL, jfsIOtask, 1); |
| wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */ |
| send_sig(SIGKILL, jfsCommitTask, 1); |
| wait_for_completion(&jfsIOwait); /* Wait until Commit thread exits */ |
| send_sig(SIGKILL, jfsSyncTask, 1); |
| wait_for_completion(&jfsIOwait); /* Wait until Sync thread exits */ |
| #if defined(CONFIG_JFS_DEBUG) && defined(CONFIG_PROC_FS) |
| jfs_proc_clean(); |
| #endif |
| unregister_filesystem(&jfs_fs_type); |
| kmem_cache_destroy(jfs_inode_cachep); |
| } |
| |
| |
| EXPORT_NO_SYMBOLS; |
| |
| module_init(init_jfs_fs) |
| module_exit(exit_jfs_fs) |