| /* |
| * Copyright (C) International Business Machines Corp., 2000-2005 |
| * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
| * |
| * 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/config.h> |
| #include <linux/fs.h> |
| #include <linux/module.h> |
| #include <linux/blkdev.h> |
| #include <linux/completion.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 struct super_operations jfs_super_operations; |
| static struct file_system_type jfs_fs_type; |
| |
| int jfs_stop_threads; |
| static pid_t jfsIOthread; |
| static pid_t jfsCommitThread; |
| static pid_t jfsSyncThread; |
| DECLARE_COMPLETION(jfsIOwait); |
| |
| #ifdef CONFIG_JFS_DEBUG |
| int jfsloglevel = JFS_LOGLEVEL_WARN; |
| 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_clear_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); |
| extern int jfs_extendfs(struct super_block *, s64, int); |
| |
| #ifdef PROC_FS_JFS /* see jfs_debug.h */ |
| extern void jfs_proc_init(void); |
| extern void jfs_proc_clean(void); |
| #endif |
| |
| extern wait_queue_head_t jfs_IO_thread_wait; |
| extern wait_queue_head_t jfs_commit_thread_wait; |
| extern wait_queue_head_t jfs_sync_thread_wait; |
| |
| static void jfs_handle_error(struct super_block *sb) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| |
| if (sb->s_flags & MS_RDONLY) |
| return; |
| |
| updateSuper(sb, FM_DIRTY); |
| |
| if (sbi->flag & JFS_ERR_PANIC) |
| panic("JFS (device %s): panic forced after error\n", |
| bdevname(sb->s_dev)); |
| else if (sbi->flag & JFS_ERR_REMOUNT_RO) { |
| jfs_err("ERROR: (device %s): remounting filesystem " |
| "as read-only\n", |
| bdevname(sb->s_dev)); |
| sb->s_flags |= MS_RDONLY; |
| } |
| |
| /* nothing is done for continue beyond marking the superblock dirty */ |
| } |
| |
| void jfs_error(struct super_block *sb, const char * function, ...) |
| { |
| static char error_buf[256]; |
| va_list args; |
| |
| va_start(args, function); |
| vsprintf(error_buf, function, args); |
| va_end(args); |
| |
| printk(KERN_ERR "ERROR: (device %s): %s\n", bdevname(sb->s_dev), |
| error_buf); |
| |
| jfs_handle_error(sb); |
| } |
| |
| static int jfs_statfs(struct super_block *sb, struct statfs *buf) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| s64 maxinodes; |
| struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; |
| |
| jfs_info("In jfs_statfs"); |
| 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; |
| |
| jfs_info("In jfs_put_super"); |
| rc = jfs_umount(sb); |
| if (rc) |
| jfs_err("jfs_umount failed with return code %d", rc); |
| if (sbi->nls_tab) { |
| unload_nls(sbi->nls_tab); |
| sbi->nls_tab = NULL; |
| } |
| |
| kfree(sbi); |
| } |
| |
| s64 jfs_get_volume_size(struct super_block *sb) |
| { |
| uint blocks = 0; |
| s64 bytes; |
| kdev_t dev = sb->s_dev; |
| int major = MAJOR(dev); |
| int minor = MINOR(dev); |
| |
| if (blk_size[major]) { |
| blocks = blk_size[major][minor]; |
| if (blocks) { |
| bytes = ((s64)blocks) << BLOCK_SIZE_BITS; |
| return bytes >> sb->s_blocksize_bits; |
| } |
| } |
| return 0; |
| } |
| |
| static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, |
| int *flag) |
| { |
| void *nls_map = (void *)-1; /* -1: no change; NULL: none */ |
| char *this_char; |
| char *value; |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| |
| *newLVSize = 0; |
| |
| if (!options) |
| return 1; |
| while ((this_char = strsep(&options, ",")) != NULL) { |
| if (!*this_char) |
| continue; |
| if ((value = strchr(this_char, '=')) != NULL) |
| *value++ = 0; |
| if (!strcmp(this_char, "errors")) { |
| if (!value || !*value) |
| goto needs_arg; |
| if (!strcmp(value, "continue")) { |
| *flag &= ~JFS_ERR_REMOUNT_RO; |
| *flag &= ~JFS_ERR_PANIC; |
| *flag |= JFS_ERR_CONTINUE; |
| } else if (!strcmp(value, "remount-ro")) { |
| *flag &= ~JFS_ERR_CONTINUE; |
| *flag &= ~JFS_ERR_PANIC; |
| *flag |= JFS_ERR_REMOUNT_RO; |
| } else if (!strcmp(value, "panic")) { |
| *flag &= ~JFS_ERR_CONTINUE; |
| *flag &= ~JFS_ERR_REMOUNT_RO; |
| *flag |= JFS_ERR_PANIC; |
| } else { |
| printk(KERN_ERR "JFS: %s is an invalid error handler\n", value); |
| goto cleanup; |
| } |
| } else if (!strcmp(this_char, "integrity")) { |
| *flag &= ~JFS_NOINTEGRITY; |
| } else if (!strcmp(this_char, "nointegrity")) { |
| *flag |= JFS_NOINTEGRITY; |
| } else if (!strcmp(this_char, "iocharset")) { |
| if (!value || !*value) |
| goto needs_arg; |
| if (nls_map && nls_map != (void *) -1) |
| unload_nls(nls_map); |
| if (!strcmp(value, "none")) |
| nls_map = NULL; |
| else |
| nls_map = load_nls(value); |
| } else if (!strcmp(this_char, "resize")) { |
| if (!value || !*value) { |
| *newLVSize = jfs_get_volume_size(sb); |
| if (*newLVSize == 0) |
| printk(KERN_ERR |
| "JFS: Cannot determine volume size\n"); |
| } else |
| *newLVSize = simple_strtoull(value, &value, 0); |
| |
| /* 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 != (void *) -1) { |
| /* Discard old (if remount) */ |
| if (sbi->nls_tab && sbi->nls_tab != (void *) -1) |
| 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 && nls_map != (void *) -1) |
| unload_nls(nls_map); |
| return 0; |
| } |
| |
| static int jfs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| s64 newLVSize = 0; |
| int rc = 0; |
| int flag = JFS_SBI(sb)->flag; |
| |
| if (!parse_options(data, sb, &newLVSize, &flag)) { |
| return -EINVAL; |
| } |
| if (newLVSize) { |
| if (sb->s_flags & MS_RDONLY) { |
| printk(KERN_ERR |
| "JFS: resize requires volume to be mounted read-write\n"); |
| return -EROFS; |
| } |
| rc = jfs_extendfs(sb, newLVSize, 0); |
| if (rc) |
| return rc; |
| } |
| |
| if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { |
| JFS_SBI(sb)->flag = flag; |
| return jfs_mount_rw(sb, 1); |
| } |
| if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { |
| rc = jfs_umount_rw(sb); |
| JFS_SBI(sb)->flag = flag; |
| return rc; |
| } |
| if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) |
| if (!(sb->s_flags & MS_RDONLY)) { |
| rc = jfs_umount_rw(sb); |
| if (rc) |
| return rc; |
| JFS_SBI(sb)->flag = flag; |
| return jfs_mount_rw(sb, 1); |
| } |
| JFS_SBI(sb)->flag = flag; |
| |
| return 0; |
| } |
| |
| static struct super_block *jfs_read_super(struct super_block *sb, |
| void *data, int silent) |
| { |
| struct jfs_sb_info *sbi; |
| struct inode *inode; |
| int rc; |
| s64 newLVSize = 0; |
| int flag; |
| |
| jfs_info("In jfs_read_super s_dev=0x%x s_flags=0x%lx", sb->s_dev, |
| sb->s_flags); |
| |
| sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); |
| if (!sbi) |
| return NULL; |
| memset(sbi, 0, sizeof (struct jfs_sb_info)); |
| sb->u.generic_sbp = sbi; |
| |
| /* initialize the mount flag and determine the default error handler */ |
| flag = JFS_ERR_REMOUNT_RO; |
| |
| /* nls_tab will be set to NULL if no character mapping is requested */ |
| sbi->nls_tab = (void *) -1; |
| if (!parse_options((char *) data, sb, &newLVSize, &flag)) { |
| kfree(sbi); |
| return NULL; |
| } |
| sbi->flag = flag; |
| |
| if (newLVSize) { |
| printk(KERN_ERR "resize option for remount only\n"); |
| return NULL; |
| } |
| |
| /* |
| * Initialize blocksize to 4K. |
| */ |
| sb_set_blocksize(sb, PSIZE); |
| |
| /* |
| * Set method vectors. |
| */ |
| sb->s_op = &jfs_super_operations; |
| |
| rc = jfs_mount(sb); |
| if (rc) { |
| if (!silent) { |
| jfs_err("jfs_mount failed w/return code = %d", rc); |
| } |
| goto out_kfree; |
| } |
| if (sb->s_flags & MS_RDONLY) |
| sbi->log = 0; |
| else { |
| rc = jfs_mount_rw(sb, 0); |
| if (rc) { |
| if (!silent) { |
| jfs_err("jfs_mount_rw failed, return code = %d", |
| 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 == (void *) -1) |
| sbi->nls_tab = load_nls_default(); |
| |
| /* logical blocks are represented by 40 bits in pxd_t, etc. */ |
| sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; |
| #if BITS_PER_LONG == 32 |
| /* |
| * Page cache is indexed by long. |
| * I would use MAX_LFS_FILESIZE, but it's only half as big |
| */ |
| sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes); |
| #endif |
| |
| return sb; |
| |
| out_no_root: |
| jfs_err("jfs_read_super: get root inode failed"); |
| if (inode) |
| iput(inode); |
| |
| out_no_rw: |
| rc = jfs_umount(sb); |
| if (rc) { |
| jfs_err("jfs_umount failed with return code %d", rc); |
| } |
| out_kfree: |
| if (sbi->nls_tab && sbi->nls_tab != (void *) -1) |
| unload_nls(sbi->nls_tab); |
| kfree(sbi); |
| return NULL; |
| } |
| |
| static void jfs_write_super_lockfs(struct super_block *sb) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| struct jfs_log *log = sbi->log; |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| txQuiesce(sb); |
| lmLogShutdown(log); |
| updateSuper(sb, FM_CLEAN); |
| } |
| } |
| |
| static void jfs_unlockfs(struct super_block *sb) |
| { |
| struct jfs_sb_info *sbi = JFS_SBI(sb); |
| struct jfs_log *log = sbi->log; |
| int rc = 0; |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| updateSuper(sb, FM_MOUNT); |
| if ((rc = lmLogInit(log))) |
| jfs_err("jfs_unlock failed with return code %d", rc); |
| else |
| txResume(sb); |
| } |
| } |
| |
| |
| static int jfs_sync_fs(struct super_block *sb) |
| { |
| struct jfs_log *log = JFS_SBI(sb)->log; |
| |
| /* log == NULL indicates read-only mount */ |
| if (log) |
| jfs_flush_journal(log, 1); |
| |
| return 0; |
| } |
| |
| static struct super_operations jfs_super_operations = { |
| .read_inode = jfs_read_inode, |
| .dirty_inode = jfs_dirty_inode, |
| .write_inode = jfs_write_inode, |
| .clear_inode = jfs_clear_inode, |
| .delete_inode = jfs_delete_inode, |
| .put_super = jfs_put_super, |
| .sync_fs = jfs_sync_fs, |
| .write_super_lockfs = jfs_write_super_lockfs, |
| .unlockfs = jfs_unlockfs, |
| .statfs = jfs_statfs, |
| .remount_fs = jfs_remount, |
| }; |
| |
| static struct file_system_type jfs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "jfs", |
| .read_super = jfs_read_super, |
| .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) { |
| memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); |
| INIT_LIST_HEAD(&jfs_ip->anon_inode_list); |
| init_rwsem(&jfs_ip->rdwrlock); |
| init_MUTEX(&jfs_ip->commit_sem); |
| spin_lock_init(&jfs_ip->ag_lock); |
| jfs_ip->active_ag = -1; |
| } |
| } |
| |
| 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) { |
| jfs_err("metapage_init failed w/rc = %d", rc); |
| goto free_slab; |
| } |
| |
| /* |
| * Transaction Manager initialization |
| */ |
| rc = txInit(); |
| if (rc) { |
| jfs_err("txInit failed w/rc = %d", rc); |
| goto free_metapage; |
| } |
| |
| /* |
| * I/O completion thread (endio) |
| */ |
| jfsIOthread = kernel_thread(jfsIOWait, 0, |
| CLONE_FS | CLONE_FILES | CLONE_SIGHAND); |
| if (jfsIOthread < 0) { |
| jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsIOthread); |
| goto end_txmngr; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until thread starts */ |
| |
| jfsCommitThread = kernel_thread(jfs_lazycommit, 0, |
| CLONE_FS | CLONE_FILES | CLONE_SIGHAND); |
| if (jfsCommitThread < 0) { |
| jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsCommitThread); |
| goto kill_iotask; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until thread starts */ |
| |
| jfsSyncThread = kernel_thread(jfs_sync, 0, |
| CLONE_FS | CLONE_FILES | CLONE_SIGHAND); |
| if (jfsSyncThread < 0) { |
| jfs_err("init_jfs_fs: fork failed w/rc = %d", jfsSyncThread); |
| goto kill_committask; |
| } |
| wait_for_completion(&jfsIOwait); /* Wait until thread starts */ |
| |
| #ifdef PROC_FS_JFS |
| jfs_proc_init(); |
| #endif |
| |
| return register_filesystem(&jfs_fs_type); |
| |
| kill_committask: |
| jfs_stop_threads = 1; |
| wake_up(&jfs_commit_thread_wait); |
| wait_for_completion(&jfsIOwait); /* Wait for thread exit */ |
| kill_iotask: |
| jfs_stop_threads = 1; |
| wake_up(&jfs_IO_thread_wait); |
| wait_for_completion(&jfsIOwait); /* Wait for thread exit */ |
| end_txmngr: |
| txExit(); |
| free_metapage: |
| metapage_exit(); |
| free_slab: |
| kmem_cache_destroy(jfs_inode_cachep); |
| return rc; |
| } |
| |
| static void __exit exit_jfs_fs(void) |
| { |
| jfs_info("exit_jfs_fs called"); |
| |
| jfs_stop_threads = 1; |
| txExit(); |
| metapage_exit(); |
| wake_up(&jfs_IO_thread_wait); |
| wait_for_completion(&jfsIOwait); /* Wait for IO thread exit */ |
| wake_up(&jfs_commit_thread_wait); |
| wait_for_completion(&jfsIOwait); /* Wait for Commit thread exit */ |
| wake_up(&jfs_sync_thread_wait); |
| wait_for_completion(&jfsIOwait); /* Wait for Sync thread exit */ |
| #ifdef PROC_FS_JFS |
| 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) |