diff options
Diffstat (limited to 'fs/jfs/super.c')
| -rw-r--r-- | fs/jfs/super.c | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/fs/jfs/super.c b/fs/jfs/super.c new file mode 100644 index 00000000000..5856866e24f --- /dev/null +++ b/fs/jfs/super.c @@ -0,0 +1,700 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * 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/fs.h> +#include <linux/config.h> +#include <linux/module.h> +#include <linux/parser.h> +#include <linux/completion.h> +#include <linux/vfs.h> +#include <linux/moduleparam.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_acl.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 struct super_operations jfs_super_operations; +static struct export_operations jfs_export_operations; +static struct file_system_type jfs_fs_type; + +#define MAX_COMMIT_THREADS 64 +static int commit_threads = 0; +module_param(commit_threads, int, 0); +MODULE_PARM_DESC(commit_threads, "Number of commit threads"); + +int jfs_stop_threads; +static pid_t jfsIOthread; +static pid_t jfsCommitThread[MAX_COMMIT_THREADS]; +static pid_t jfsSyncThread; +DECLARE_COMPLETION(jfsIOwait); + +#ifdef CONFIG_JFS_DEBUG +int jfsloglevel = JFS_LOGLEVEL_WARN; +module_param(jfsloglevel, int, 0644); +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_read_inode(struct inode *inode); +extern void jfs_dirty_inode(struct inode *inode); +extern void jfs_delete_inode(struct inode *inode); +extern int jfs_write_inode(struct inode *inode, int wait); + +extern struct dentry *jfs_get_parent(struct dentry *dentry); +extern int jfs_extendfs(struct super_block *, s64, int); + +extern struct dentry_operations jfs_ci_dentry_operations; + +#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", + sb->s_id); + else if (sbi->flag & JFS_ERR_REMOUNT_RO) { + jfs_err("ERROR: (device %s): remounting filesystem " + "as read-only\n", + sb->s_id); + 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", sb->s_id, error_buf); + + jfs_handle_error(sb); +} + +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) +{ + struct jfs_inode_info *ji = JFS_IP(inode); + + spin_lock_irq(&ji->ag_lock); + if (ji->active_ag != -1) { + struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; + atomic_dec(&bmap->db_active[ji->active_ag]); + ji->active_ag = -1; + } + spin_unlock_irq(&ji->ag_lock); + +#ifdef CONFIG_JFS_POSIX_ACL + if (ji->i_acl != JFS_ACL_NOT_CACHED) { + posix_acl_release(ji->i_acl); + ji->i_acl = JFS_ACL_NOT_CACHED; + } + if (ji->i_default_acl != JFS_ACL_NOT_CACHED) { + posix_acl_release(ji->i_default_acl); + ji->i_default_acl = JFS_ACL_NOT_CACHED; + } +#endif + + kmem_cache_free(jfs_inode_cachep, ji); +} + +static int jfs_statfs(struct super_block *sb, struct kstatfs *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); +} + +enum { + Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, + Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, +}; + +static match_table_t tokens = { + {Opt_integrity, "integrity"}, + {Opt_nointegrity, "nointegrity"}, + {Opt_iocharset, "iocharset=%s"}, + {Opt_resize, "resize=%u"}, + {Opt_resize_nosize, "resize"}, + {Opt_errors, "errors=%s"}, + {Opt_ignore, "noquota"}, + {Opt_ignore, "quota"}, + {Opt_ignore, "usrquota"}, + {Opt_ignore, "grpquota"}, + {Opt_err, NULL} +}; + +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 *p; + struct jfs_sb_info *sbi = JFS_SBI(sb); + + *newLVSize = 0; + + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + substring_t args[MAX_OPT_ARGS]; + int token; + if (!*p) + continue; + + token = match_token(p, tokens, args); + switch (token) { + case Opt_integrity: + *flag &= ~JFS_NOINTEGRITY; + break; + case Opt_nointegrity: + *flag |= JFS_NOINTEGRITY; + break; + case Opt_ignore: + /* Silently ignore the quota options */ + /* Don't do anything ;-) */ + break; + case Opt_iocharset: + if (nls_map && nls_map != (void *) -1) + unload_nls(nls_map); + if (!strcmp(args[0].from, "none")) + nls_map = NULL; + else { + nls_map = load_nls(args[0].from); + if (!nls_map) { + printk(KERN_ERR + "JFS: charset not found\n"); + goto cleanup; + } + } + break; + case Opt_resize: + { + char *resize = args[0].from; + *newLVSize = simple_strtoull(resize, &resize, 0); + break; + } + case Opt_resize_nosize: + { + *newLVSize = sb->s_bdev->bd_inode->i_size >> + sb->s_blocksize_bits; + if (*newLVSize == 0) + printk(KERN_ERR + "JFS: Cannot determine volume size\n"); + break; + } + case Opt_errors: + { + char *errors = args[0].from; + if (!errors || !*errors) + goto cleanup; + if (!strcmp(errors, "continue")) { + *flag &= ~JFS_ERR_REMOUNT_RO; + *flag &= ~JFS_ERR_PANIC; + *flag |= JFS_ERR_CONTINUE; + } else if (!strcmp(errors, "remount-ro")) { + *flag &= ~JFS_ERR_CONTINUE; + *flag &= ~JFS_ERR_PANIC; + *flag |= JFS_ERR_REMOUNT_RO; + } else if (!strcmp(errors, "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", + errors); + goto cleanup; + } + break; + } + default: + printk("jfs: Unrecognized mount option \"%s\" " + " or missing value\n", p); + goto cleanup; + } + } + + if (nls_map != (void *) -1) { + /* Discard old (if remount) */ + if (sbi->nls_tab) + unload_nls(sbi->nls_tab); + sbi->nls_tab = nls_map; + } + return 1; + +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 int jfs_fill_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_flags=0x%lx", sb->s_flags); + + if (!new_valid_dev(sb->s_bdev->bd_dev)) + return -EOVERFLOW; + + sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOSPC; + memset(sbi, 0, sizeof (struct jfs_sb_info)); + sb->s_fs_info = sbi; + sbi->sb = sb; + + /* initialize the mount flag and determine the default error handler */ + flag = JFS_ERR_REMOUNT_RO; + + if (!parse_options((char *) data, sb, &newLVSize, &flag)) { + kfree(sbi); + return -EINVAL; + } + sbi->flag = flag; + +#ifdef CONFIG_JFS_POSIX_ACL + sb->s_flags |= MS_POSIXACL; +#endif + + if (newLVSize) { + printk(KERN_ERR "resize option for remount only\n"); + return -EINVAL; + } + + /* + * Initialize blocksize to 4K. + */ + sb_set_blocksize(sb, PSIZE); + + /* + * Set method vectors. + */ + sb->s_op = &jfs_super_operations; + sb->s_export_op = &jfs_export_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 = NULL; + 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->mntflag & JFS_OS2) + sb->s_root->d_op = &jfs_ci_dentry_operations; + + /* 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 + sb->s_time_gran = 1; + return 0; + +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) + unload_nls(sbi->nls_tab); + kfree(sbi); + return -EINVAL; +} + +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 struct super_block *jfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super); +} + +static int jfs_sync_fs(struct super_block *sb, int wait) +{ + struct jfs_log *log = JFS_SBI(sb)->log; + + /* log == NULL indicates read-only mount */ + if (log) + jfs_flush_journal(log, wait); + + return 0; +} + +static struct super_operations jfs_super_operations = { + .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, + .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 export_operations jfs_export_operations = { + .get_parent = jfs_get_parent, +}; + +static struct file_system_type jfs_fs_type = { + .owner = THIS_MODULE, + .name = "jfs", + .get_sb = jfs_get_sb, + .kill_sb = kill_block_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); + init_rwsem(&jfs_ip->xattr_sem); + spin_lock_init(&jfs_ip->ag_lock); + jfs_ip->active_ag = -1; +#ifdef CONFIG_JFS_POSIX_ACL + jfs_ip->i_acl = JFS_ACL_NOT_CACHED; + jfs_ip->i_default_acl = JFS_ACL_NOT_CACHED; +#endif + inode_init_once(&jfs_ip->vfs_inode); + } +} + +static int __init init_jfs_fs(void) +{ + int i; + int rc; + + jfs_inode_cachep = + kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, + SLAB_RECLAIM_ACCOUNT, 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, NULL, CLONE_KERNEL); + 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 */ + + if (commit_threads < 1) + commit_threads = num_online_cpus(); + if (commit_threads > MAX_COMMIT_THREADS) + commit_threads = MAX_COMMIT_THREADS; + + for (i = 0; i < commit_threads; i++) { + jfsCommitThread[i] = kernel_thread(jfs_lazycommit, NULL, + CLONE_KERNEL); + if (jfsCommitThread[i] < 0) { + jfs_err("init_jfs_fs: fork failed w/rc = %d", + jfsCommitThread[i]); + commit_threads = i; + goto kill_committask; + } + /* Wait until thread starts */ + wait_for_completion(&jfsIOwait); + } + + jfsSyncThread = kernel_thread(jfs_sync, NULL, CLONE_KERNEL); + 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_all(&jfs_commit_thread_wait); + for (i = 0; i < commit_threads; i++) + wait_for_completion(&jfsIOwait); + + 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) +{ + int i; + + jfs_info("exit_jfs_fs called"); + + jfs_stop_threads = 1; + txExit(); + metapage_exit(); + wake_up(&jfs_IO_thread_wait); + wait_for_completion(&jfsIOwait); /* Wait until IO thread exits */ + wake_up_all(&jfs_commit_thread_wait); + for (i = 0; i < commit_threads; i++) + wait_for_completion(&jfsIOwait); + wake_up(&jfs_sync_thread_wait); + wait_for_completion(&jfsIOwait); /* Wait until Sync thread exits */ +#ifdef PROC_FS_JFS + jfs_proc_clean(); +#endif + unregister_filesystem(&jfs_fs_type); + kmem_cache_destroy(jfs_inode_cachep); +} + +module_init(init_jfs_fs) +module_exit(exit_jfs_fs) |