1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
700 lines
17 KiB
C
700 lines
17 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/parser.h>
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#include <linux/completion.h>
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#include <linux/vfs.h>
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#include <linux/moduleparam.h>
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#include <asm/uaccess.h>
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#include "jfs_incore.h"
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#include "jfs_filsys.h"
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#include "jfs_metapage.h"
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#include "jfs_superblock.h"
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#include "jfs_dmap.h"
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#include "jfs_imap.h"
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#include "jfs_acl.h"
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#include "jfs_debug.h"
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MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
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MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
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MODULE_LICENSE("GPL");
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static kmem_cache_t * jfs_inode_cachep;
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static struct super_operations jfs_super_operations;
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static struct export_operations jfs_export_operations;
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static struct file_system_type jfs_fs_type;
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#define MAX_COMMIT_THREADS 64
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static int commit_threads = 0;
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module_param(commit_threads, int, 0);
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MODULE_PARM_DESC(commit_threads, "Number of commit threads");
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int jfs_stop_threads;
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static pid_t jfsIOthread;
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static pid_t jfsCommitThread[MAX_COMMIT_THREADS];
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static pid_t jfsSyncThread;
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DECLARE_COMPLETION(jfsIOwait);
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#ifdef CONFIG_JFS_DEBUG
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int jfsloglevel = JFS_LOGLEVEL_WARN;
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module_param(jfsloglevel, int, 0644);
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MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
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#endif
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/*
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* External declarations
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*/
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extern int jfs_mount(struct super_block *);
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extern int jfs_mount_rw(struct super_block *, int);
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extern int jfs_umount(struct super_block *);
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extern int jfs_umount_rw(struct super_block *);
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extern int jfsIOWait(void *);
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extern int jfs_lazycommit(void *);
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extern int jfs_sync(void *);
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extern void jfs_read_inode(struct inode *inode);
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extern void jfs_dirty_inode(struct inode *inode);
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extern void jfs_delete_inode(struct inode *inode);
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extern int jfs_write_inode(struct inode *inode, int wait);
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extern struct dentry *jfs_get_parent(struct dentry *dentry);
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extern int jfs_extendfs(struct super_block *, s64, int);
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extern struct dentry_operations jfs_ci_dentry_operations;
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#ifdef PROC_FS_JFS /* see jfs_debug.h */
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extern void jfs_proc_init(void);
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extern void jfs_proc_clean(void);
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#endif
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extern wait_queue_head_t jfs_IO_thread_wait;
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extern wait_queue_head_t jfs_commit_thread_wait;
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extern wait_queue_head_t jfs_sync_thread_wait;
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static void jfs_handle_error(struct super_block *sb)
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{
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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if (sb->s_flags & MS_RDONLY)
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return;
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updateSuper(sb, FM_DIRTY);
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if (sbi->flag & JFS_ERR_PANIC)
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panic("JFS (device %s): panic forced after error\n",
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sb->s_id);
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else if (sbi->flag & JFS_ERR_REMOUNT_RO) {
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jfs_err("ERROR: (device %s): remounting filesystem "
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"as read-only\n",
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sb->s_id);
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sb->s_flags |= MS_RDONLY;
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}
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/* nothing is done for continue beyond marking the superblock dirty */
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}
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void jfs_error(struct super_block *sb, const char * function, ...)
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{
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static char error_buf[256];
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va_list args;
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va_start(args, function);
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vsprintf(error_buf, function, args);
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va_end(args);
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printk(KERN_ERR "ERROR: (device %s): %s\n", sb->s_id, error_buf);
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jfs_handle_error(sb);
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}
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static struct inode *jfs_alloc_inode(struct super_block *sb)
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{
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struct jfs_inode_info *jfs_inode;
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jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS);
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if (!jfs_inode)
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return NULL;
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return &jfs_inode->vfs_inode;
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}
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static void jfs_destroy_inode(struct inode *inode)
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{
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struct jfs_inode_info *ji = JFS_IP(inode);
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spin_lock_irq(&ji->ag_lock);
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if (ji->active_ag != -1) {
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struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
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atomic_dec(&bmap->db_active[ji->active_ag]);
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ji->active_ag = -1;
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}
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spin_unlock_irq(&ji->ag_lock);
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#ifdef CONFIG_JFS_POSIX_ACL
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if (ji->i_acl != JFS_ACL_NOT_CACHED) {
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posix_acl_release(ji->i_acl);
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ji->i_acl = JFS_ACL_NOT_CACHED;
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}
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if (ji->i_default_acl != JFS_ACL_NOT_CACHED) {
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posix_acl_release(ji->i_default_acl);
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ji->i_default_acl = JFS_ACL_NOT_CACHED;
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}
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#endif
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kmem_cache_free(jfs_inode_cachep, ji);
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}
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static int jfs_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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s64 maxinodes;
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struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
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jfs_info("In jfs_statfs");
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buf->f_type = JFS_SUPER_MAGIC;
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buf->f_bsize = sbi->bsize;
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buf->f_blocks = sbi->bmap->db_mapsize;
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buf->f_bfree = sbi->bmap->db_nfree;
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buf->f_bavail = sbi->bmap->db_nfree;
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/*
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* If we really return the number of allocated & free inodes, some
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* applications will fail because they won't see enough free inodes.
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* We'll try to calculate some guess as to how may inodes we can
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* really allocate
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*
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* buf->f_files = atomic_read(&imap->im_numinos);
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* buf->f_ffree = atomic_read(&imap->im_numfree);
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*/
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maxinodes = min((s64) atomic_read(&imap->im_numinos) +
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((sbi->bmap->db_nfree >> imap->im_l2nbperiext)
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<< L2INOSPEREXT), (s64) 0xffffffffLL);
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buf->f_files = maxinodes;
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buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) -
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atomic_read(&imap->im_numfree));
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buf->f_namelen = JFS_NAME_MAX;
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return 0;
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}
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static void jfs_put_super(struct super_block *sb)
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{
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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int rc;
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jfs_info("In jfs_put_super");
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rc = jfs_umount(sb);
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if (rc)
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jfs_err("jfs_umount failed with return code %d", rc);
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if (sbi->nls_tab)
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unload_nls(sbi->nls_tab);
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sbi->nls_tab = NULL;
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kfree(sbi);
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}
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enum {
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Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize,
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Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err,
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};
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static match_table_t tokens = {
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{Opt_integrity, "integrity"},
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{Opt_nointegrity, "nointegrity"},
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{Opt_iocharset, "iocharset=%s"},
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{Opt_resize, "resize=%u"},
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{Opt_resize_nosize, "resize"},
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{Opt_errors, "errors=%s"},
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{Opt_ignore, "noquota"},
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{Opt_ignore, "quota"},
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{Opt_ignore, "usrquota"},
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{Opt_ignore, "grpquota"},
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{Opt_err, NULL}
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};
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static int parse_options(char *options, struct super_block *sb, s64 *newLVSize,
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int *flag)
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{
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void *nls_map = (void *)-1; /* -1: no change; NULL: none */
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char *p;
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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*newLVSize = 0;
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if (!options)
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return 1;
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while ((p = strsep(&options, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_integrity:
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*flag &= ~JFS_NOINTEGRITY;
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break;
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case Opt_nointegrity:
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*flag |= JFS_NOINTEGRITY;
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break;
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case Opt_ignore:
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/* Silently ignore the quota options */
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/* Don't do anything ;-) */
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break;
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case Opt_iocharset:
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if (nls_map && nls_map != (void *) -1)
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unload_nls(nls_map);
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if (!strcmp(args[0].from, "none"))
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nls_map = NULL;
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else {
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nls_map = load_nls(args[0].from);
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if (!nls_map) {
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printk(KERN_ERR
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"JFS: charset not found\n");
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goto cleanup;
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}
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}
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break;
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case Opt_resize:
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{
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char *resize = args[0].from;
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*newLVSize = simple_strtoull(resize, &resize, 0);
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break;
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}
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case Opt_resize_nosize:
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{
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*newLVSize = sb->s_bdev->bd_inode->i_size >>
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sb->s_blocksize_bits;
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if (*newLVSize == 0)
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printk(KERN_ERR
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"JFS: Cannot determine volume size\n");
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break;
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}
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case Opt_errors:
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{
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char *errors = args[0].from;
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if (!errors || !*errors)
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goto cleanup;
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if (!strcmp(errors, "continue")) {
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*flag &= ~JFS_ERR_REMOUNT_RO;
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*flag &= ~JFS_ERR_PANIC;
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*flag |= JFS_ERR_CONTINUE;
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} else if (!strcmp(errors, "remount-ro")) {
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*flag &= ~JFS_ERR_CONTINUE;
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*flag &= ~JFS_ERR_PANIC;
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*flag |= JFS_ERR_REMOUNT_RO;
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} else if (!strcmp(errors, "panic")) {
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*flag &= ~JFS_ERR_CONTINUE;
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*flag &= ~JFS_ERR_REMOUNT_RO;
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*flag |= JFS_ERR_PANIC;
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} else {
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printk(KERN_ERR
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"JFS: %s is an invalid error handler\n",
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errors);
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goto cleanup;
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}
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break;
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}
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default:
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printk("jfs: Unrecognized mount option \"%s\" "
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" or missing value\n", p);
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goto cleanup;
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}
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}
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if (nls_map != (void *) -1) {
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/* Discard old (if remount) */
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if (sbi->nls_tab)
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unload_nls(sbi->nls_tab);
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sbi->nls_tab = nls_map;
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}
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return 1;
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cleanup:
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if (nls_map && nls_map != (void *) -1)
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unload_nls(nls_map);
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return 0;
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}
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static int jfs_remount(struct super_block *sb, int *flags, char *data)
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{
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s64 newLVSize = 0;
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int rc = 0;
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int flag = JFS_SBI(sb)->flag;
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if (!parse_options(data, sb, &newLVSize, &flag)) {
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return -EINVAL;
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}
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if (newLVSize) {
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if (sb->s_flags & MS_RDONLY) {
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printk(KERN_ERR
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"JFS: resize requires volume to be mounted read-write\n");
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return -EROFS;
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}
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rc = jfs_extendfs(sb, newLVSize, 0);
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if (rc)
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return rc;
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}
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if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
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JFS_SBI(sb)->flag = flag;
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return jfs_mount_rw(sb, 1);
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}
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if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) {
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rc = jfs_umount_rw(sb);
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JFS_SBI(sb)->flag = flag;
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return rc;
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}
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if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY))
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if (!(sb->s_flags & MS_RDONLY)) {
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rc = jfs_umount_rw(sb);
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if (rc)
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return rc;
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JFS_SBI(sb)->flag = flag;
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return jfs_mount_rw(sb, 1);
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}
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JFS_SBI(sb)->flag = flag;
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return 0;
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}
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static int jfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct jfs_sb_info *sbi;
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struct inode *inode;
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int rc;
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s64 newLVSize = 0;
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int flag;
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jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
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if (!new_valid_dev(sb->s_bdev->bd_dev))
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return -EOVERFLOW;
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sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOSPC;
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memset(sbi, 0, sizeof (struct jfs_sb_info));
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sb->s_fs_info = sbi;
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sbi->sb = sb;
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/* initialize the mount flag and determine the default error handler */
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flag = JFS_ERR_REMOUNT_RO;
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if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
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kfree(sbi);
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return -EINVAL;
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}
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sbi->flag = flag;
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#ifdef CONFIG_JFS_POSIX_ACL
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sb->s_flags |= MS_POSIXACL;
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#endif
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if (newLVSize) {
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printk(KERN_ERR "resize option for remount only\n");
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return -EINVAL;
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}
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/*
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* Initialize blocksize to 4K.
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*/
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sb_set_blocksize(sb, PSIZE);
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/*
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* Set method vectors.
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*/
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sb->s_op = &jfs_super_operations;
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sb->s_export_op = &jfs_export_operations;
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rc = jfs_mount(sb);
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if (rc) {
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if (!silent) {
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jfs_err("jfs_mount failed w/return code = %d", rc);
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}
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goto out_kfree;
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}
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if (sb->s_flags & MS_RDONLY)
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sbi->log = NULL;
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else {
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rc = jfs_mount_rw(sb, 0);
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if (rc) {
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if (!silent) {
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jfs_err("jfs_mount_rw failed, return code = %d",
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rc);
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}
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goto out_no_rw;
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}
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}
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sb->s_magic = JFS_SUPER_MAGIC;
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inode = iget(sb, ROOT_I);
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if (!inode || is_bad_inode(inode))
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goto out_no_root;
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sb->s_root = d_alloc_root(inode);
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if (!sb->s_root)
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goto out_no_root;
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if (sbi->mntflag & JFS_OS2)
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sb->s_root->d_op = &jfs_ci_dentry_operations;
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/* logical blocks are represented by 40 bits in pxd_t, etc. */
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sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
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#if BITS_PER_LONG == 32
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/*
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* Page cache is indexed by long.
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* I would use MAX_LFS_FILESIZE, but it's only half as big
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*/
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sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
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#endif
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sb->s_time_gran = 1;
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return 0;
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out_no_root:
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jfs_err("jfs_read_super: get root inode failed");
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if (inode)
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iput(inode);
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out_no_rw:
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rc = jfs_umount(sb);
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if (rc) {
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jfs_err("jfs_umount failed with return code %d", rc);
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}
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out_kfree:
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if (sbi->nls_tab)
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unload_nls(sbi->nls_tab);
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kfree(sbi);
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return -EINVAL;
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}
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static void jfs_write_super_lockfs(struct super_block *sb)
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{
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struct jfs_sb_info *sbi = JFS_SBI(sb);
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struct jfs_log *log = sbi->log;
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if (!(sb->s_flags & MS_RDONLY)) {
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txQuiesce(sb);
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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)
|