/* * 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/module.h> #include <linux/parser.h> #include <linux/completion.h> #include <linux/vfs.h> #include <linux/mount.h> #include <linux/moduleparam.h> #include <linux/kthread.h> #include <linux/posix_acl.h> #include <asm/uaccess.h> #include <linux/seq_file.h> #include "jfs_incore.h" #include "jfs_filsys.h" #include "jfs_inode.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"); static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; struct task_struct *jfsIOthread; struct task_struct *jfsSyncThread; #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 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); BUG_ON(!list_empty(&ji->anon_inode_list)); 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 dentry *dentry, struct kstatfs *buf) { struct jfs_sb_info *sbi = JFS_SBI(dentry->d_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; truncate_inode_pages(sbi->direct_inode->i_mapping, 0); iput(sbi->direct_inode); sbi->direct_inode = NULL; kfree(sbi); } enum { Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask }; 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_usrquota, "usrquota"}, {Opt_grpquota, "grpquota"}, {Opt_uid, "uid=%u"}, {Opt_gid, "gid=%u"}, {Opt_umask, "umask=%u"}, {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; } #if defined(CONFIG_QUOTA) case Opt_quota: case Opt_usrquota: *flag |= JFS_USRQUOTA; break; case Opt_grpquota: *flag |= JFS_GRPQUOTA; break; #else case Opt_usrquota: case Opt_grpquota: case Opt_quota: printk(KERN_ERR "JFS: quota operations not supported\n"); break; #endif case Opt_uid: { char *uid = args[0].from; sbi->uid = simple_strtoul(uid, &uid, 0); break; } case Opt_gid: { char *gid = args[0].from; sbi->gid = simple_strtoul(gid, &gid, 0); break; } case Opt_umask: { char *umask = args[0].from; sbi->umask = simple_strtoul(umask, &umask, 8); if (sbi->umask & ~0777) { printk(KERN_ERR "JFS: Invalid value of umask\n"); 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)) { /* * Invalidate any previously read metadata. fsck may have * changed the on-disk data since we mounted r/o */ truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); 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 = kzalloc(sizeof (struct jfs_sb_info), GFP_KERNEL); if (!sbi) return -ENOSPC; sb->s_fs_info = sbi; sbi->sb = sb; sbi->uid = sbi->gid = sbi->umask = -1; /* 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; /* * 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 = sb->s_bdev->bd_inode->i_size; inode->i_mapping->a_ops = &jfs_metapage_aops; insert_inode_hash(inode); mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); sbi->direct_inode = inode; rc = jfs_mount(sb); if (rc) { if (!silent) { jfs_err("jfs_mount failed w/return code = %d", rc); } goto out_mount_failed; } 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_mount_failed: filemap_write_and_wait(sbi->direct_inode->i_mapping); truncate_inode_pages(sbi->direct_inode->i_mapping, 0); make_bad_inode(sbi->direct_inode); iput(sbi->direct_inode); sbi->direct_inode = NULL; 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 int jfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super, mnt); } 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); jfs_syncpt(log, 0); } return 0; } static int jfs_show_options(struct seq_file *seq, struct vfsmount *vfs) { struct jfs_sb_info *sbi = JFS_SBI(vfs->mnt_sb); if (sbi->uid != -1) seq_printf(seq, ",uid=%d", sbi->uid); if (sbi->gid != -1) seq_printf(seq, ",gid=%d", sbi->gid); if (sbi->umask != -1) seq_printf(seq, ",umask=%03o", sbi->umask); if (sbi->flag & JFS_NOINTEGRITY) seq_puts(seq, ",nointegrity"); #if defined(CONFIG_QUOTA) if (sbi->flag & JFS_USRQUOTA) seq_puts(seq, ",usrquota"); if (sbi->flag & JFS_GRPQUOTA) seq_puts(seq, ",grpquota"); #endif 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, .show_options = jfs_show_options }; 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, }; 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); mutex_init(&jfs_ip->commit_mutex); 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|SLAB_MEM_SPREAD, 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 = kthread_run(jfsIOWait, NULL, "jfsIO"); if (IS_ERR(jfsIOthread)) { rc = PTR_ERR(jfsIOthread); jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); goto end_txmngr; } 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] = kthread_run(jfs_lazycommit, NULL, "jfsCommit"); if (IS_ERR(jfsCommitThread[i])) { rc = PTR_ERR(jfsCommitThread[i]); jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); commit_threads = i; goto kill_committask; } } jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); if (IS_ERR(jfsSyncThread)) { rc = PTR_ERR(jfsSyncThread); jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); goto kill_committask; } #ifdef PROC_FS_JFS jfs_proc_init(); #endif return register_filesystem(&jfs_fs_type); kill_committask: for (i = 0; i < commit_threads; i++) kthread_stop(jfsCommitThread[i]); kthread_stop(jfsIOthread); 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"); txExit(); metapage_exit(); kthread_stop(jfsIOthread); for (i = 0; i < commit_threads; i++) kthread_stop(jfsCommitThread[i]); kthread_stop(jfsSyncThread); #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)