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linux/fs/jfs/super.c
Dave Kleikamp ac17b8b570 JFS: make special inodes play nicely with page balancing 
This patch fixes up a few problems with jfs's reserved inodes.

1. There is no need for the jfs code setting the I_DIRTY bits in i_state.
   I am ashamed that the code ever did this, and surprised it hasn't been
   noticed until now.

2. Make sure special inodes are on an inode hash list.  If the inodes are
   unhashed, __mark_inode_dirty will fail to put the inode on the
   superblock's dirty list, and the data will not be flushed under memory
   pressure.

3. Force writing journal data to disk when metapage_writepage is unable to
   write a metadata page due to pending journal I/O.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2005-10-03 15:32:11 -05:00

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/*
* 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/mount.h>
#include <linux/moduleparam.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");
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
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 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;
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
};
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_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
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 = 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;
/*
* 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_fdatawrite(sbi->direct_inode->i_mapping);
filemap_fdatawait(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 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);
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->flag & JFS_NOINTEGRITY)
seq_puts(seq, ",nointegrity");
else
seq_puts(seq, ",integrity");
#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);
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)
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