patch-2.4.20 linux-2.4.20/fs/jfs/super.c

• Lines: 491
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/super.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/super.c linux-2.4.20/fs/jfs/super.c
@@ -0,0 +1,490 @@
+/*
+ *   Copyright (c) International Business Machines Corp., 2000-2002
+ *   Portions Copyright (c) Christoph Hellwig, 2001-2002
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or 
+ *   (at your option) any later version.
+ * 
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program;  if not, write to the Free Software 
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/config.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/completion.h>
+#include <asm/uaccess.h>
+#include "jfs_incore.h"
+#include "jfs_filsys.h"
+#include "jfs_metapage.h"
+#include "jfs_superblock.h"
+#include "jfs_dmap.h"
+#include "jfs_imap.h"
+#include "jfs_debug.h"
+
+MODULE_DESCRIPTION("The Journaled Filesystem (JFS)");
+MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM");
+MODULE_LICENSE("GPL");
+
+static struct super_operations jfs_super_operations;
+static struct file_system_type jfs_fs_type;
+
+int jfs_stop_threads;
+static pid_t jfsIOthread;
+static pid_t jfsCommitThread;
+static pid_t jfsSyncThread;
+DECLARE_COMPLETION(jfsIOwait);
+
+#ifdef CONFIG_JFS_DEBUG
+int jfsloglevel = 1;
+MODULE_PARM(jfsloglevel, "i");
+MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)");
+#endif
+
+/*
+ * External declarations
+ */
+extern int jfs_mount(struct super_block *);
+extern int jfs_mount_rw(struct super_block *, int);
+extern int jfs_umount(struct super_block *);
+extern int jfs_umount_rw(struct super_block *);
+
+extern int jfsIOWait(void *);
+extern int jfs_lazycommit(void *);
+extern int jfs_sync(void *);
+extern void jfs_clear_inode(struct inode *inode);
+extern void jfs_read_inode(struct inode *inode);
+extern void jfs_dirty_inode(struct inode *inode);
+extern void jfs_delete_inode(struct inode *inode);
+extern void jfs_write_inode(struct inode *inode, int wait);
+extern int jfs_extendfs(struct super_block *, s64, int);
+
+#ifdef PROC_FS_JFS		/* see jfs_debug.h */
+extern void jfs_proc_init(void);
+extern void jfs_proc_clean(void);
+#endif
+
+extern wait_queue_head_t jfs_IO_thread_wait;
+extern wait_queue_head_t jfs_commit_thread_wait;
+extern wait_queue_head_t jfs_sync_thread_wait;
+
+static int jfs_statfs(struct super_block *sb, struct statfs *buf)
+{
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+	s64 maxinodes;
+	struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap;
+
+	jFYI(1, ("In jfs_statfs\n"));
+	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;
+
+	jFYI(1, ("In jfs_put_super\n"));
+	rc = jfs_umount(sb);
+	if (rc) {
+		jERROR(1, ("jfs_umount failed with return code %d\n", rc));
+	}
+	unload_nls(sbi->nls_tab);
+	sbi->nls_tab = NULL;
+
+	kfree(sbi);
+}
+
+static int parse_options(char *options, struct super_block *sb, s64 *newLVSize)
+{
+	void *nls_map = NULL;
+	char *this_char;
+	char *value;
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+
+	*newLVSize = 0;
+
+	if (!options)
+		return 1;
+	while ((this_char = strsep(&options, ",")) != NULL) {
+		if (!*this_char)
+			continue;
+		if ((value = strchr(this_char, '=')) != NULL)
+			*value++ = 0;
+		if (!strcmp(this_char, "iocharset")) {
+			if (!value || !*value)
+				goto needs_arg;
+			if (nls_map)	/* specified iocharset twice! */
+				unload_nls(nls_map);
+			nls_map = load_nls(value);
+			if (!nls_map) {
+				printk(KERN_ERR "JFS: charset not found\n");
+				goto cleanup;
+			}
+		} else if (!strcmp(this_char, "resize")) {
+			if (!value || !*value) {
+				*newLVSize = sb->s_bdev->bd_inode->i_size >>
+					sb->s_blocksize_bits;
+				if (*newLVSize == 0)
+					printk(KERN_ERR
+					 "JFS: Cannot determine volume size\n");
+			} else
+				*newLVSize = simple_strtoull(value, &value, 0);
+
+			/* Silently ignore the quota options */
+		} else if (!strcmp(this_char, "grpquota")
+			   || !strcmp(this_char, "noquota")
+			   || !strcmp(this_char, "quota")
+			   || !strcmp(this_char, "usrquota"))
+			/* Don't do anything ;-) */ ;
+		else {
+			printk("jfs: Unrecognized mount option %s\n",
+			       this_char);
+			goto cleanup;
+		}
+	}
+	if (nls_map) {
+		/* Discard old (if remount) */
+		if (sbi->nls_tab)
+			unload_nls(sbi->nls_tab);
+		sbi->nls_tab = nls_map;
+	}
+	return 1;
+needs_arg:
+	printk(KERN_ERR "JFS: %s needs an argument\n", this_char);
+cleanup:
+	if (nls_map)
+		unload_nls(nls_map);
+	return 0;
+}
+
+int jfs_remount(struct super_block *sb, int *flags, char *data)
+{
+	s64 newLVSize = 0;
+	int rc = 0;
+
+	if (!parse_options(data, sb, &newLVSize)) {
+		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))
+		return jfs_mount_rw(sb, 1);
+	else if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY))
+		return jfs_umount_rw(sb);
+
+	return 0;
+}
+
+static struct super_block *jfs_read_super(struct super_block *sb,
+					  void *data, int silent)
+{
+	struct jfs_sb_info *sbi;
+	struct inode *inode;
+	int rc;
+	s64 newLVSize = 0;
+
+	jFYI(1,
+	     ("In jfs_read_super s_dev=0x%x s_flags=0x%lx\n", sb->s_dev,
+	      sb->s_flags));
+
+	sbi = kmalloc(sizeof (struct jfs_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return NULL;
+	memset(sbi, 0, sizeof (struct jfs_sb_info));
+	sb->u.generic_sbp = sbi;
+
+	if (!parse_options((char *) data, sb, &newLVSize)) {
+		kfree(sbi);
+		return NULL;
+	}
+
+	if (newLVSize) {
+		printk(KERN_ERR "resize option for remount only\n");
+		return NULL;
+	}
+
+	/*
+	 * Initialize blocksize to 4K.
+	 */
+	sb_set_blocksize(sb, PSIZE);
+
+	/*
+	 * Set method vectors.
+	 */
+	sb->s_op = &jfs_super_operations;
+
+	rc = jfs_mount(sb);
+	if (rc) {
+		if (!silent) {
+			jERROR(1,
+			       ("jfs_mount failed w/return code = %d\n", rc));
+		}
+		goto out_kfree;
+	}
+	if (sb->s_flags & MS_RDONLY)
+		sbi->log = 0;
+	else {
+		rc = jfs_mount_rw(sb, 0);
+		if (rc) {
+			if (!silent) {
+				jERROR(1,
+				       ("jfs_mount_rw failed w/return code = %d\n",
+					rc));
+			}
+			goto out_no_rw;
+		}
+	}
+
+	sb->s_magic = JFS_SUPER_MAGIC;
+
+	inode = iget(sb, ROOT_I);
+	if (!inode || is_bad_inode(inode))
+		goto out_no_root;
+	sb->s_root = d_alloc_root(inode);
+	if (!sb->s_root)
+		goto out_no_root;
+
+	if (!sbi->nls_tab)
+		sbi->nls_tab = load_nls_default();
+
+	/* logical blocks are represented by 40 bits in pxd_t, etc. */
+	sb->s_maxbytes = ((u64) sb->s_blocksize) << 40;
+#if BITS_PER_LONG == 32
+	/*
+	 * Page cache is indexed by long.
+	 * I would use MAX_LFS_FILESIZE, but it's only half as big
+	 */
+	sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, sb->s_maxbytes);
+#endif
+
+	return sb;
+
+out_no_root:
+	jEVENT(1, ("jfs_read_super: get root inode failed\n"));
+	if (inode)
+		iput(inode);
+
+out_no_rw:
+	rc = jfs_umount(sb);
+	if (rc) {
+		jERROR(1, ("jfs_umount failed with return code %d\n", rc));
+	}
+out_kfree:
+	if (sbi->nls_tab)
+		unload_nls(sbi->nls_tab);
+	kfree(sbi);
+	return NULL;
+}
+
+static void jfs_write_super_lockfs(struct super_block *sb)
+{
+	struct jfs_sb_info *sbi = JFS_SBI(sb);
+	struct jfs_log *log = sbi->log;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		txQuiesce(sb);
+		lmLogShutdown(log);
+	}
+}
+
+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)) {
+		if ((rc = lmLogInit(log)))
+			jERROR(1,
+			       ("jfs_unlock failed with return code %d\n", rc));
+		else
+			txResume(sb);
+	}
+}
+
+
+static struct super_operations jfs_super_operations = {
+	.read_inode	= jfs_read_inode,
+	.dirty_inode	= jfs_dirty_inode,
+	.write_inode	= jfs_write_inode,
+	.clear_inode	= jfs_clear_inode,
+	.delete_inode	= jfs_delete_inode,
+	.put_super	= jfs_put_super,
+	.write_super_lockfs = jfs_write_super_lockfs,
+	.unlockfs       = jfs_unlockfs,
+	.statfs		= jfs_statfs,
+	.remount_fs	= jfs_remount,
+};
+
+static struct file_system_type jfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "jfs",
+	.read_super	= jfs_read_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+
+extern int metapage_init(void);
+extern int txInit(void);
+extern void txExit(void);
+extern void metapage_exit(void);
+
+static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR) {
+		INIT_LIST_HEAD(&jfs_ip->anon_inode_list);
+		INIT_LIST_HEAD(&jfs_ip->mp_list);
+		init_rwsem(&jfs_ip->rdwrlock);
+		init_MUTEX(&jfs_ip->commit_sem);
+		jfs_ip->atlhead = 0;
+		jfs_ip->active_ag = -1;
+	}
+}
+
+static int __init init_jfs_fs(void)
+{
+	int rc;
+
+	jfs_inode_cachep =
+	    kmem_cache_create("jfs_ip", sizeof (struct jfs_inode_info), 0, 0,
+			      init_once, NULL);
+	if (jfs_inode_cachep == NULL)
+		return -ENOMEM;
+
+	/*
+	 * Metapage initialization
+	 */
+	rc = metapage_init();
+	if (rc) {
+		jERROR(1, ("metapage_init failed w/rc = %d\n", rc));
+		goto free_slab;
+	}
+
+	/*
+	 * Transaction Manager initialization
+	 */
+	rc = txInit();
+	if (rc) {
+		jERROR(1, ("txInit failed w/rc = %d\n", rc));
+		goto free_metapage;
+	}
+
+	/*
+	 * I/O completion thread (endio)
+	 */
+	jfsIOthread = kernel_thread(jfsIOWait, 0,
+				    CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
+	if (jfsIOthread < 0) {
+		jERROR(1,
+		       ("init_jfs_fs: fork failed w/rc = %d\n", jfsIOthread));
+		goto end_txmngr;
+	}
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
+
+	jfsCommitThread = kernel_thread(jfs_lazycommit, 0,
+					CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
+	if (jfsCommitThread < 0) {
+		jERROR(1,
+		       ("init_jfs_fs: fork failed w/rc = %d\n",
+			jfsCommitThread));
+		goto kill_iotask;
+	}
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
+
+	jfsSyncThread = kernel_thread(jfs_sync, 0,
+				      CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
+	if (jfsSyncThread < 0) {
+		jERROR(1,
+		       ("init_jfs_fs: fork failed w/rc = %d\n", jfsSyncThread));
+		goto kill_committask;
+	}
+	wait_for_completion(&jfsIOwait);	/* Wait until thread starts */
+
+#ifdef PROC_FS_JFS
+	jfs_proc_init();
+#endif
+
+	return register_filesystem(&jfs_fs_type);
+
+kill_committask:
+	jfs_stop_threads = 1;
+	wake_up(&jfs_commit_thread_wait);
+	wait_for_completion(&jfsIOwait);	/* Wait for thread exit */
+kill_iotask:
+	jfs_stop_threads = 1;
+	wake_up(&jfs_IO_thread_wait);
+	wait_for_completion(&jfsIOwait);	/* Wait for thread exit */
+end_txmngr:
+	txExit();
+free_metapage:
+	metapage_exit();
+free_slab:
+	kmem_cache_destroy(jfs_inode_cachep);
+	return -rc;
+}
+
+static void __exit exit_jfs_fs(void)
+{
+	jFYI(1, ("exit_jfs_fs called\n"));
+
+	jfs_stop_threads = 1;
+	txExit();
+	metapage_exit();
+	wake_up(&jfs_IO_thread_wait);
+	wait_for_completion(&jfsIOwait);	/* Wait for IO thread exit */
+	wake_up(&jfs_commit_thread_wait);
+	wait_for_completion(&jfsIOwait);	/* Wait for Commit thread exit */
+	wake_up(&jfs_sync_thread_wait);
+	wait_for_completion(&jfsIOwait);	/* Wait for Sync thread exit */
+#ifdef PROC_FS_JFS
+	jfs_proc_clean();
+#endif
+	unregister_filesystem(&jfs_fs_type);
+	kmem_cache_destroy(jfs_inode_cachep);
+}
+
+EXPORT_NO_SYMBOLS;
+
+module_init(init_jfs_fs)
+module_exit(exit_jfs_fs)