patch-2.4.15 linux/fs/ext3/super.c
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- Lines: 1746
- Date:
Fri Nov 9 14:25:04 2001
- Orig file:
v2.4.14/linux/fs/ext3/super.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.14/linux/fs/ext3/super.c linux/fs/ext3/super.c
@@ -0,0 +1,1745 @@
+/*
+ * linux/fs/ext3/super.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ * from
+ *
+ * linux/fs/minix/inode.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * Big-endian to little-endian byte-swapping/bitmaps by
+ * David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/locks.h>
+#include <linux/blkdev.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_JBD_DEBUG
+static int ext3_ro_after; /* Make fs read-only after this many jiffies */
+#endif
+
+static int ext3_load_journal(struct super_block *, struct ext3_super_block *);
+static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
+ int);
+static void ext3_commit_super (struct super_block * sb,
+ struct ext3_super_block * es,
+ int sync);
+static void ext3_mark_recovery_complete(struct super_block * sb,
+ struct ext3_super_block * es);
+static void ext3_clear_journal_err(struct super_block * sb,
+ struct ext3_super_block * es);
+
+#ifdef CONFIG_JBD_DEBUG
+int journal_no_write[2];
+
+/*
+ * Debug code for turning filesystems "read-only" after a specified
+ * amount of time. This is for crash/recovery testing.
+ */
+
+static void make_rdonly(kdev_t dev, int *no_write)
+{
+ if (dev) {
+ printk(KERN_WARNING "Turning device %s read-only\n",
+ bdevname(dev));
+ *no_write = 0xdead0000 + dev;
+ }
+}
+
+static void turn_fs_readonly(unsigned long arg)
+{
+ struct super_block *sb = (struct super_block *)arg;
+
+ make_rdonly(sb->s_dev, &journal_no_write[0]);
+ make_rdonly(EXT3_SB(sb)->s_journal->j_dev, &journal_no_write[1]);
+ wake_up(&EXT3_SB(sb)->ro_wait_queue);
+}
+
+static void setup_ro_after(struct super_block *sb)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ init_timer(&sbi->turn_ro_timer);
+ if (ext3_ro_after) {
+ printk(KERN_DEBUG "fs will go read-only in %d jiffies\n",
+ ext3_ro_after);
+ init_waitqueue_head(&sbi->ro_wait_queue);
+ journal_no_write[0] = 0;
+ journal_no_write[1] = 0;
+ sbi->turn_ro_timer.function = turn_fs_readonly;
+ sbi->turn_ro_timer.data = (unsigned long)sb;
+ sbi->turn_ro_timer.expires = jiffies + ext3_ro_after;
+ ext3_ro_after = 0;
+ add_timer(&sbi->turn_ro_timer);
+ }
+}
+
+static void clear_ro_after(struct super_block *sb)
+{
+ del_timer_sync(&EXT3_SB(sb)->turn_ro_timer);
+ journal_no_write[0] = 0;
+ journal_no_write[1] = 0;
+ ext3_ro_after = 0;
+}
+#else
+#define setup_ro_after(sb) do {} while (0)
+#define clear_ro_after(sb) do {} while (0)
+#endif
+
+
+static char error_buf[1024];
+
+/* Determine the appropriate response to ext3_error on a given filesystem */
+
+static int ext3_error_behaviour(struct super_block *sb)
+{
+ /* First check for mount-time options */
+ if (test_opt (sb, ERRORS_PANIC))
+ return EXT3_ERRORS_PANIC;
+ if (test_opt (sb, ERRORS_RO))
+ return EXT3_ERRORS_RO;
+ if (test_opt (sb, ERRORS_CONT))
+ return EXT3_ERRORS_CONTINUE;
+
+ /* If no overrides were specified on the mount, then fall back
+ * to the default behaviour set in the filesystem's superblock
+ * on disk. */
+ switch (le16_to_cpu(sb->u.ext3_sb.s_es->s_errors)) {
+ case EXT3_ERRORS_PANIC:
+ return EXT3_ERRORS_PANIC;
+ case EXT3_ERRORS_RO:
+ return EXT3_ERRORS_RO;
+ default:
+ break;
+ }
+ return EXT3_ERRORS_CONTINUE;
+}
+
+/* Deal with the reporting of failure conditions on a filesystem such as
+ * inconsistencies detected or read IO failures.
+ *
+ * On ext2, we can store the error state of the filesystem in the
+ * superblock. That is not possible on ext3, because we may have other
+ * write ordering constraints on the superblock which prevent us from
+ * writing it out straight away; and given that the journal is about to
+ * be aborted, we can't rely on the current, or future, transactions to
+ * write out the superblock safely.
+ *
+ * We'll just use the journal_abort() error code to record an error in
+ * the journal instead. On recovery, the journal will compain about
+ * that error until we've noted it down and cleared it.
+ */
+
+static void ext3_handle_error(struct super_block *sb)
+{
+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+
+ EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+ es->s_state |= cpu_to_le32(EXT3_ERROR_FS);
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ if (ext3_error_behaviour(sb) != EXT3_ERRORS_CONTINUE) {
+ EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
+ journal_abort(EXT3_SB(sb)->s_journal, -EIO);
+ }
+
+ if (ext3_error_behaviour(sb) == EXT3_ERRORS_PANIC)
+ panic ("EXT3-fs (device %s): panic forced after error\n",
+ bdevname(sb->s_dev));
+
+ if (ext3_error_behaviour(sb) == EXT3_ERRORS_RO) {
+ printk (KERN_CRIT "Remounting filesystem read-only\n");
+ sb->s_flags |= MS_RDONLY;
+ }
+
+ ext3_commit_super(sb, es, 1);
+}
+
+void ext3_error (struct super_block * sb, const char * function,
+ const char * fmt, ...)
+{
+ va_list args;
+
+ va_start (args, fmt);
+ vsprintf (error_buf, fmt, args);
+ va_end (args);
+
+ printk (KERN_CRIT "EXT3-fs error (device %s): %s: %s\n",
+ bdevname(sb->s_dev), function, error_buf);
+
+ ext3_handle_error(sb);
+}
+
+const char *ext3_decode_error(struct super_block * sb, int errno, char nbuf[16])
+{
+ char *errstr = NULL;
+
+ switch (errno) {
+ case -EIO:
+ errstr = "IO failure";
+ break;
+ case -ENOMEM:
+ errstr = "Out of memory";
+ break;
+ case -EROFS:
+ if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
+ errstr = "Journal has aborted";
+ else
+ errstr = "Readonly filesystem";
+ break;
+ default:
+ /* If the caller passed in an extra buffer for unknown
+ * errors, textualise them now. Else we just return
+ * NULL. */
+ if (nbuf) {
+ /* Check for truncated error codes... */
+ if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
+ errstr = nbuf;
+ }
+
+ break;
+ }
+
+ return errstr;
+}
+
+/* __ext3_std_error decodes expected errors from journaling functions
+ * automatically and invokes the appropriate error response. */
+
+void __ext3_std_error (struct super_block * sb, const char * function,
+ int errno)
+{
+ char nbuf[16];
+ const char *errstr = ext3_decode_error(sb, errno, nbuf);
+
+ printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
+ bdevname(sb->s_dev), function, errstr);
+
+ ext3_handle_error(sb);
+}
+
+/*
+ * ext3_abort is a much stronger failure handler than ext3_error. The
+ * abort function may be used to deal with unrecoverable failures such
+ * as journal IO errors or ENOMEM at a critical moment in log management.
+ *
+ * We unconditionally force the filesystem into an ABORT|READONLY state,
+ * unless the error response on the fs has been set to panic in which
+ * case we take the easy way out and panic immediately.
+ */
+
+void ext3_abort (struct super_block * sb, const char * function,
+ const char * fmt, ...)
+{
+ va_list args;
+
+ printk (KERN_CRIT "ext3_abort called.\n");
+
+ va_start (args, fmt);
+ vsprintf (error_buf, fmt, args);
+ va_end (args);
+
+ if (ext3_error_behaviour(sb) == EXT3_ERRORS_PANIC)
+ panic ("EXT3-fs panic (device %s): %s: %s\n",
+ bdevname(sb->s_dev), function, error_buf);
+
+ printk (KERN_CRIT "EXT3-fs abort (device %s): %s: %s\n",
+ bdevname(sb->s_dev), function, error_buf);
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ printk (KERN_CRIT "Remounting filesystem read-only\n");
+ sb->u.ext3_sb.s_mount_state |= EXT3_ERROR_FS;
+ sb->s_flags |= MS_RDONLY;
+ sb->u.ext3_sb.s_mount_opt |= EXT3_MOUNT_ABORT;
+ journal_abort(EXT3_SB(sb)->s_journal, -EIO);
+}
+
+/* Deal with the reporting of failure conditions while running, such as
+ * inconsistencies in operation or invalid system states.
+ *
+ * Use ext3_error() for cases of invalid filesystem states, as that will
+ * record an error on disk and force a filesystem check on the next boot.
+ */
+NORET_TYPE void ext3_panic (struct super_block * sb, const char * function,
+ const char * fmt, ...)
+{
+ va_list args;
+
+ va_start (args, fmt);
+ vsprintf (error_buf, fmt, args);
+ va_end (args);
+
+ /* this is to prevent panic from syncing this filesystem */
+ /* AKPM: is this sufficient? */
+ sb->s_flags |= MS_RDONLY;
+ panic ("EXT3-fs panic (device %s): %s: %s\n",
+ bdevname(sb->s_dev), function, error_buf);
+}
+
+void ext3_warning (struct super_block * sb, const char * function,
+ const char * fmt, ...)
+{
+ va_list args;
+
+ va_start (args, fmt);
+ vsprintf (error_buf, fmt, args);
+ va_end (args);
+ printk (KERN_WARNING "EXT3-fs warning (device %s): %s: %s\n",
+ bdevname(sb->s_dev), function, error_buf);
+}
+
+void ext3_update_dynamic_rev(struct super_block *sb)
+{
+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+
+ if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
+ return;
+
+ ext3_warning(sb, __FUNCTION__,
+ "updating to rev %d because of new feature flag, "
+ "running e2fsck is recommended",
+ EXT3_DYNAMIC_REV);
+
+ es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
+ es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
+ es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
+ /* leave es->s_feature_*compat flags alone */
+ /* es->s_uuid will be set by e2fsck if empty */
+
+ /*
+ * The rest of the superblock fields should be zero, and if not it
+ * means they are likely already in use, so leave them alone. We
+ * can leave it up to e2fsck to clean up any inconsistencies there.
+ */
+}
+
+/*
+ * Open the external journal device
+ */
+static struct block_device *ext3_blkdev_get(kdev_t dev)
+{
+ struct block_device *bdev;
+ int err = -ENODEV;
+
+ bdev = bdget(kdev_t_to_nr(dev));
+ if (bdev == NULL)
+ goto fail;
+ err = blkdev_get(bdev, FMODE_READ|FMODE_WRITE, 0, BDEV_FS);
+ if (err < 0)
+ goto fail;
+ return bdev;
+
+fail:
+ printk(KERN_ERR "EXT3: failed to open journal device %s: %d\n",
+ bdevname(dev), err);
+ return NULL;
+}
+
+/*
+ * Release the journal device
+ */
+static int ext3_blkdev_put(struct block_device *bdev)
+{
+ return blkdev_put(bdev, BDEV_FS);
+}
+
+static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
+{
+ struct block_device *bdev;
+ int ret = -ENODEV;
+
+ bdev = sbi->journal_bdev;
+ if (bdev) {
+ ret = ext3_blkdev_put(bdev);
+ sbi->journal_bdev = 0;
+ }
+ return ret;
+}
+
+#define orphan_list_entry(l) list_entry((l), struct inode, u.ext3_i.i_orphan)
+
+static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
+{
+ struct list_head *l;
+
+ printk(KERN_ERR "sb orphan head is %d\n",
+ le32_to_cpu(sbi->s_es->s_last_orphan));
+
+ printk(KERN_ERR "sb_info orphan list:\n");
+ list_for_each(l, &sbi->s_orphan) {
+ struct inode *inode = orphan_list_entry(l);
+ printk(KERN_ERR " "
+ "inode 0x%04x:%ld at %p: mode %o, nlink %d, next %d\n",
+ inode->i_dev, inode->i_ino, inode,
+ inode->i_mode, inode->i_nlink,
+ le32_to_cpu(NEXT_ORPHAN(inode)));
+ }
+}
+
+void ext3_put_super (struct super_block * sb)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ kdev_t j_dev = sbi->s_journal->j_dev;
+ int i;
+
+ journal_destroy(sbi->s_journal);
+ if (!(sb->s_flags & MS_RDONLY)) {
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ es->s_state = le16_to_cpu(sbi->s_mount_state);
+ BUFFER_TRACE(sbi->s_sbh, "marking dirty");
+ mark_buffer_dirty(sbi->s_sbh);
+ ext3_commit_super(sb, es, 1);
+ }
+
+ for (i = 0; i < sbi->s_gdb_count; i++)
+ brelse(sbi->s_group_desc[i]);
+ kfree(sbi->s_group_desc);
+ for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++)
+ brelse(sbi->s_inode_bitmap[i]);
+ for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++)
+ brelse(sbi->s_block_bitmap[i]);
+ brelse(sbi->s_sbh);
+
+ /* Debugging code just in case the in-memory inode orphan list
+ * isn't empty. The on-disk one can be non-empty if we've
+ * detected an error and taken the fs readonly, but the
+ * in-memory list had better be clean by this point. */
+ if (!list_empty(&sbi->s_orphan))
+ dump_orphan_list(sb, sbi);
+ J_ASSERT(list_empty(&sbi->s_orphan));
+
+ invalidate_buffers(sb->s_dev);
+ if (j_dev != sb->s_dev) {
+ /*
+ * Invalidate the journal device's buffers. We don't want them
+ * floating about in memory - the physical journal device may
+ * hotswapped, and it breaks the `ro-after' testing code.
+ */
+ fsync_no_super(j_dev);
+ invalidate_buffers(j_dev);
+ ext3_blkdev_remove(sbi);
+ }
+ clear_ro_after(sb);
+
+ return;
+}
+
+static struct super_operations ext3_sops = {
+ read_inode: ext3_read_inode, /* BKL held */
+ write_inode: ext3_write_inode, /* BKL not held. Don't need */
+ dirty_inode: ext3_dirty_inode, /* BKL not held. We take it */
+ put_inode: ext3_put_inode, /* BKL not held. Don't need */
+ delete_inode: ext3_delete_inode, /* BKL not held. We take it */
+ put_super: ext3_put_super, /* BKL held */
+ write_super: ext3_write_super, /* BKL held */
+ write_super_lockfs: ext3_write_super_lockfs, /* BKL not held. Take it */
+ unlockfs: ext3_unlockfs, /* BKL not held. We take it */
+ statfs: ext3_statfs, /* BKL held */
+ remount_fs: ext3_remount, /* BKL held */
+};
+
+static int want_value(char *value, char *option)
+{
+ if (!value || !*value) {
+ printk(KERN_NOTICE "EXT3-fs: the %s option needs an argument\n",
+ option);
+ return -1;
+ }
+ return 0;
+}
+
+static int want_null_value(char *value, char *option)
+{
+ if (*value) {
+ printk(KERN_NOTICE "EXT3-fs: Invalid %s argument: %s\n",
+ option, value);
+ return -1;
+ }
+ return 0;
+}
+
+static int want_numeric(char *value, char *option, unsigned long *number)
+{
+ if (want_value(value, option))
+ return -1;
+ *number = simple_strtoul(value, &value, 0);
+ if (want_null_value(value, option))
+ return -1;
+ return 0;
+}
+
+/*
+ * This function has been shamelessly adapted from the msdos fs
+ */
+static int parse_options (char * options, unsigned long * sb_block,
+ struct ext3_sb_info *sbi,
+ unsigned long * inum,
+ int is_remount)
+{
+ unsigned long *mount_options = &sbi->s_mount_opt;
+ uid_t *resuid = &sbi->s_resuid;
+ gid_t *resgid = &sbi->s_resgid;
+ char * this_char;
+ char * value;
+
+ if (!options)
+ return 1;
+ for (this_char = strtok (options, ",");
+ this_char != NULL;
+ this_char = strtok (NULL, ",")) {
+ if ((value = strchr (this_char, '=')) != NULL)
+ *value++ = 0;
+ if (!strcmp (this_char, "bsddf"))
+ clear_opt (*mount_options, MINIX_DF);
+ else if (!strcmp (this_char, "nouid32")) {
+ set_opt (*mount_options, NO_UID32);
+ }
+ else if (!strcmp (this_char, "abort"))
+ set_opt (*mount_options, ABORT);
+ else if (!strcmp (this_char, "check")) {
+ if (!value || !*value || !strcmp (value, "none"))
+ clear_opt (*mount_options, CHECK);
+ else
+#ifdef CONFIG_EXT3_CHECK
+ set_opt (*mount_options, CHECK);
+#else
+ printk(KERN_ERR
+ "EXT3 Check option not supported\n");
+#endif
+ }
+ else if (!strcmp (this_char, "debug"))
+ set_opt (*mount_options, DEBUG);
+ else if (!strcmp (this_char, "errors")) {
+ if (want_value(value, "errors"))
+ return 0;
+ if (!strcmp (value, "continue")) {
+ clear_opt (*mount_options, ERRORS_RO);
+ clear_opt (*mount_options, ERRORS_PANIC);
+ set_opt (*mount_options, ERRORS_CONT);
+ }
+ else if (!strcmp (value, "remount-ro")) {
+ clear_opt (*mount_options, ERRORS_CONT);
+ clear_opt (*mount_options, ERRORS_PANIC);
+ set_opt (*mount_options, ERRORS_RO);
+ }
+ else if (!strcmp (value, "panic")) {
+ clear_opt (*mount_options, ERRORS_CONT);
+ clear_opt (*mount_options, ERRORS_RO);
+ set_opt (*mount_options, ERRORS_PANIC);
+ }
+ else {
+ printk (KERN_ERR
+ "EXT3-fs: Invalid errors option: %s\n",
+ value);
+ return 0;
+ }
+ }
+ else if (!strcmp (this_char, "grpid") ||
+ !strcmp (this_char, "bsdgroups"))
+ set_opt (*mount_options, GRPID);
+ else if (!strcmp (this_char, "minixdf"))
+ set_opt (*mount_options, MINIX_DF);
+ else if (!strcmp (this_char, "nocheck"))
+ clear_opt (*mount_options, CHECK);
+ else if (!strcmp (this_char, "nogrpid") ||
+ !strcmp (this_char, "sysvgroups"))
+ clear_opt (*mount_options, GRPID);
+ else if (!strcmp (this_char, "resgid")) {
+ unsigned long v;
+ if (want_numeric(value, "resgid", &v))
+ return 0;
+ *resgid = v;
+ }
+ else if (!strcmp (this_char, "resuid")) {
+ unsigned long v;
+ if (want_numeric(value, "resuid", &v))
+ return 0;
+ *resuid = v;
+ }
+ else if (!strcmp (this_char, "sb")) {
+ if (want_numeric(value, "sb", sb_block))
+ return 0;
+ }
+#ifdef CONFIG_JBD_DEBUG
+ else if (!strcmp (this_char, "ro-after")) {
+ unsigned long v;
+ if (want_numeric(value, "ro-after", &v))
+ return 0;
+ ext3_ro_after = v;
+ }
+#endif
+ /* 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 if (!strcmp (this_char, "journal")) {
+ /* @@@ FIXME */
+ /* Eventually we will want to be able to create
+ a journal file here. For now, only allow the
+ user to specify an existing inode to be the
+ journal file. */
+ if (is_remount) {
+ printk(KERN_ERR "EXT3-fs: cannot specify "
+ "journal on remount\n");
+ return 0;
+ }
+
+ if (want_value(value, "journal"))
+ return 0;
+ if (!strcmp (value, "update"))
+ set_opt (*mount_options, UPDATE_JOURNAL);
+ else if (want_numeric(value, "journal", inum))
+ return 0;
+ }
+ else if (!strcmp (this_char, "noload"))
+ set_opt (*mount_options, NOLOAD);
+ else if (!strcmp (this_char, "data")) {
+ int data_opt = 0;
+
+ if (want_value(value, "data"))
+ return 0;
+ if (!strcmp (value, "journal"))
+ data_opt = EXT3_MOUNT_JOURNAL_DATA;
+ else if (!strcmp (value, "ordered"))
+ data_opt = EXT3_MOUNT_ORDERED_DATA;
+ else if (!strcmp (value, "writeback"))
+ data_opt = EXT3_MOUNT_WRITEBACK_DATA;
+ else {
+ printk (KERN_ERR
+ "EXT3-fs: Invalid data option: %s\n",
+ value);
+ return 0;
+ }
+ if (is_remount) {
+ if ((*mount_options & EXT3_MOUNT_DATA_FLAGS) !=
+ data_opt) {
+ printk(KERN_ERR
+ "EXT3-fs: cannot change data "
+ "mode on remount\n");
+ return 0;
+ }
+ } else {
+ *mount_options &= ~EXT3_MOUNT_DATA_FLAGS;
+ *mount_options |= data_opt;
+ }
+ } else {
+ printk (KERN_ERR
+ "EXT3-fs: Unrecognized mount option %s\n",
+ this_char);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
+ int read_only)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ int res = 0;
+
+ if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
+ printk (KERN_ERR "EXT3-fs warning: revision level too high, "
+ "forcing read-only mode\n");
+ res = MS_RDONLY;
+ }
+ if (read_only)
+ return res;
+ if (!(sbi->s_mount_state & EXT3_VALID_FS))
+ printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
+ "running e2fsck is recommended\n");
+ else if ((sbi->s_mount_state & EXT3_ERROR_FS))
+ printk (KERN_WARNING
+ "EXT3-fs warning: mounting fs with errors, "
+ "running e2fsck is recommended\n");
+ else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
+ le16_to_cpu(es->s_mnt_count) >=
+ (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
+ printk (KERN_WARNING
+ "EXT3-fs warning: maximal mount count reached, "
+ "running e2fsck is recommended\n");
+ else if (le32_to_cpu(es->s_checkinterval) &&
+ (le32_to_cpu(es->s_lastcheck) +
+ le32_to_cpu(es->s_checkinterval) <= CURRENT_TIME))
+ printk (KERN_WARNING
+ "EXT3-fs warning: checktime reached, "
+ "running e2fsck is recommended\n");
+#if 0
+ /* @@@ We _will_ want to clear the valid bit if we find
+ inconsistencies, to force a fsck at reboot. But for
+ a plain journaled filesystem we can keep it set as
+ valid forever! :) */
+ es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
+#endif
+ if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
+ es->s_max_mnt_count =
+ (__s16) cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
+ es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
+ es->s_mtime = cpu_to_le32(CURRENT_TIME);
+ ext3_update_dynamic_rev(sb);
+ EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ ext3_commit_super (sb, es, 1);
+ if (test_opt (sb, DEBUG))
+ printk (KERN_INFO
+ "[EXT3 FS %s, %s, bs=%lu, gc=%lu, "
+ "bpg=%lu, ipg=%lu, mo=%04lx]\n",
+ EXT3FS_VERSION, EXT3FS_DATE, sb->s_blocksize,
+ sbi->s_groups_count,
+ EXT3_BLOCKS_PER_GROUP(sb),
+ EXT3_INODES_PER_GROUP(sb),
+ sbi->s_mount_opt);
+ printk(KERN_INFO "EXT3 FS " EXT3FS_VERSION ", " EXT3FS_DATE " on %s, ",
+ bdevname(sb->s_dev));
+ if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
+ printk("external journal on %s\n",
+ bdevname(EXT3_SB(sb)->s_journal->j_dev));
+ } else {
+ printk("internal journal\n");
+ }
+#ifdef CONFIG_EXT3_CHECK
+ if (test_opt (sb, CHECK)) {
+ ext3_check_blocks_bitmap (sb);
+ ext3_check_inodes_bitmap (sb);
+ }
+#endif
+ setup_ro_after(sb);
+ return res;
+}
+
+static int ext3_check_descriptors (struct super_block * sb)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
+ struct ext3_group_desc * gdp = NULL;
+ int desc_block = 0;
+ int i;
+
+ ext3_debug ("Checking group descriptors");
+
+ for (i = 0; i < sbi->s_groups_count; i++)
+ {
+ if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
+ gdp = (struct ext3_group_desc *)
+ sbi->s_group_desc[desc_block++]->b_data;
+ if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
+ le32_to_cpu(gdp->bg_block_bitmap) >=
+ block + EXT3_BLOCKS_PER_GROUP(sb))
+ {
+ ext3_error (sb, "ext3_check_descriptors",
+ "Block bitmap for group %d"
+ " not in group (block %lu)!",
+ i, (unsigned long)
+ le32_to_cpu(gdp->bg_block_bitmap));
+ return 0;
+ }
+ if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
+ le32_to_cpu(gdp->bg_inode_bitmap) >=
+ block + EXT3_BLOCKS_PER_GROUP(sb))
+ {
+ ext3_error (sb, "ext3_check_descriptors",
+ "Inode bitmap for group %d"
+ " not in group (block %lu)!",
+ i, (unsigned long)
+ le32_to_cpu(gdp->bg_inode_bitmap));
+ return 0;
+ }
+ if (le32_to_cpu(gdp->bg_inode_table) < block ||
+ le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
+ block + EXT3_BLOCKS_PER_GROUP(sb))
+ {
+ ext3_error (sb, "ext3_check_descriptors",
+ "Inode table for group %d"
+ " not in group (block %lu)!",
+ i, (unsigned long)
+ le32_to_cpu(gdp->bg_inode_table));
+ return 0;
+ }
+ block += EXT3_BLOCKS_PER_GROUP(sb);
+ gdp++;
+ }
+ return 1;
+}
+
+
+/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
+ * the superblock) which were deleted from all directories, but held open by
+ * a process at the time of a crash. We walk the list and try to delete these
+ * inodes at recovery time (only with a read-write filesystem).
+ *
+ * In order to keep the orphan inode chain consistent during traversal (in
+ * case of crash during recovery), we link each inode into the superblock
+ * orphan list_head and handle it the same way as an inode deletion during
+ * normal operation (which journals the operations for us).
+ *
+ * We only do an iget() and an iput() on each inode, which is very safe if we
+ * accidentally point at an in-use or already deleted inode. The worst that
+ * can happen in this case is that we get a "bit already cleared" message from
+ * ext3_free_inode(). The only reason we would point at a wrong inode is if
+ * e2fsck was run on this filesystem, and it must have already done the orphan
+ * inode cleanup for us, so we can safely abort without any further action.
+ */
+static void ext3_orphan_cleanup (struct super_block * sb,
+ struct ext3_super_block * es)
+{
+ unsigned int s_flags = sb->s_flags;
+ int nr_orphans = 0, nr_truncates = 0;
+ if (!es->s_last_orphan) {
+ jbd_debug(4, "no orphan inodes to clean up\n");
+ return;
+ }
+
+ if (s_flags & MS_RDONLY) {
+ printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
+ bdevname(sb->s_dev));
+ sb->s_flags &= ~MS_RDONLY;
+ }
+
+ if (sb->u.ext3_sb.s_mount_state & EXT3_ERROR_FS) {
+ if (es->s_last_orphan)
+ jbd_debug(1, "Errors on filesystem, "
+ "clearing orphan list.\n");
+ es->s_last_orphan = 0;
+ jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
+ return;
+ }
+
+ while (es->s_last_orphan) {
+ struct inode *inode;
+
+ if (!(inode =
+ ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
+ es->s_last_orphan = 0;
+ break;
+ }
+
+ list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
+ if (inode->i_nlink) {
+ printk(KERN_DEBUG __FUNCTION__
+ ": truncating inode %ld to %Ld bytes\n",
+ inode->i_ino, inode->i_size);
+ jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
+ inode->i_ino, inode->i_size);
+ ext3_truncate(inode);
+ nr_truncates++;
+ } else {
+ printk(KERN_DEBUG __FUNCTION__
+ ": deleting unreferenced inode %ld\n",
+ inode->i_ino);
+ jbd_debug(2, "deleting unreferenced inode %ld\n",
+ inode->i_ino);
+ nr_orphans++;
+ }
+ iput(inode); /* The delete magic happens here! */
+ }
+
+#define PLURAL(x) (x), ((x)==1) ? "" : "s"
+
+ if (nr_orphans)
+ printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
+ bdevname(sb->s_dev), PLURAL(nr_orphans));
+ if (nr_truncates)
+ printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
+ bdevname(sb->s_dev), PLURAL(nr_truncates));
+ sb->s_flags = s_flags; /* Restore MS_RDONLY status */
+}
+
+#define log2(n) ffz(~(n))
+
+/*
+ * Maximal file size. There is a direct, and {,double-,triple-}indirect
+ * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
+ * We need to be 1 filesystem block less than the 2^32 sector limit.
+ */
+static loff_t ext3_max_size(int bits)
+{
+ loff_t res = EXT3_NDIR_BLOCKS;
+ res += 1LL << (bits-2);
+ res += 1LL << (2*(bits-2));
+ res += 1LL << (3*(bits-2));
+ res <<= bits;
+ if (res > (512LL << 32) - (1 << bits))
+ res = (512LL << 32) - (1 << bits);
+ return res;
+}
+
+struct super_block * ext3_read_super (struct super_block * sb, void * data,
+ int silent)
+{
+ struct buffer_head * bh;
+ struct ext3_super_block *es = 0;
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ unsigned long sb_block = 1;
+ unsigned long logic_sb_block = 1;
+ unsigned long offset = 0;
+ unsigned long journal_inum = 0;
+ kdev_t dev = sb->s_dev;
+ int blocksize;
+ int hblock;
+ int db_count;
+ int i;
+ int needs_recovery;
+
+#ifdef CONFIG_JBD_DEBUG
+ ext3_ro_after = 0;
+#endif
+ /*
+ * See what the current blocksize for the device is, and
+ * use that as the blocksize. Otherwise (or if the blocksize
+ * is smaller than the default) use the default.
+ * This is important for devices that have a hardware
+ * sectorsize that is larger than the default.
+ */
+ blocksize = EXT3_MIN_BLOCK_SIZE;
+ hblock = get_hardsect_size(dev);
+ if (blocksize < hblock)
+ blocksize = hblock;
+
+ sbi->s_mount_opt = 0;
+ sbi->s_resuid = EXT3_DEF_RESUID;
+ sbi->s_resgid = EXT3_DEF_RESGID;
+ if (!parse_options ((char *) data, &sb_block, sbi, &journal_inum, 0)) {
+ sb->s_dev = 0;
+ goto out_fail;
+ }
+
+ set_blocksize (dev, blocksize);
+
+ /*
+ * The ext3 superblock will not be buffer aligned for other than 1kB
+ * block sizes. We need to calculate the offset from buffer start.
+ */
+ if (blocksize != EXT3_MIN_BLOCK_SIZE) {
+ logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
+ offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
+ }
+
+ if (!(bh = bread (dev, logic_sb_block, blocksize))) {
+ printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
+ goto out_fail;
+ }
+ /*
+ * Note: s_es must be initialized as soon as possible because
+ * some ext3 macro-instructions depend on its value
+ */
+ es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
+ sbi->s_es = es;
+ sb->s_magic = le16_to_cpu(es->s_magic);
+ if (sb->s_magic != EXT3_SUPER_MAGIC) {
+ if (!silent)
+ printk(KERN_ERR
+ "VFS: Can't find ext3 filesystem on dev %s.\n",
+ bdevname(dev));
+ goto failed_mount;
+ }
+ if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
+ (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
+ EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
+ EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
+ printk(KERN_WARNING
+ "EXT3-fs warning: feature flags set on rev 0 fs, "
+ "running e2fsck is recommended\n");
+ /*
+ * Check feature flags regardless of the revision level, since we
+ * previously didn't change the revision level when setting the flags,
+ * so there is a chance incompat flags are set on a rev 0 filesystem.
+ */
+ if ((i = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))) {
+ printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
+ "unsupported optional features (%x).\n",
+ bdevname(dev), i);
+ goto failed_mount;
+ }
+ if (!(sb->s_flags & MS_RDONLY) &&
+ (i = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))){
+ printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
+ "unsupported optional features (%x).\n",
+ bdevname(dev), i);
+ goto failed_mount;
+ }
+ sb->s_blocksize_bits = le32_to_cpu(es->s_log_block_size) + 10;
+ sb->s_blocksize = 1 << sb->s_blocksize_bits;
+
+ if (sb->s_blocksize < EXT3_MIN_BLOCK_SIZE ||
+ sb->s_blocksize > EXT3_MAX_BLOCK_SIZE) {
+ printk(KERN_ERR
+ "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
+ blocksize, bdevname(dev));
+ goto failed_mount;
+ }
+
+ sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
+
+ if (sb->s_blocksize != blocksize) {
+ blocksize = sb->s_blocksize;
+
+ /*
+ * Make sure the blocksize for the filesystem is larger
+ * than the hardware sectorsize for the machine.
+ */
+ if (sb->s_blocksize < hblock) {
+ printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
+ "device blocksize %d.\n", blocksize, hblock);
+ goto failed_mount;
+ }
+
+ brelse (bh);
+ set_blocksize (dev, sb->s_blocksize);
+ logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
+ offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
+ bh = bread (dev, logic_sb_block, blocksize);
+ if (!bh) {
+ printk(KERN_ERR
+ "EXT3-fs: Can't read superblock on 2nd try.\n");
+ return NULL;
+ }
+ es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
+ sbi->s_es = es;
+ if (es->s_magic != le16_to_cpu(EXT3_SUPER_MAGIC)) {
+ printk (KERN_ERR
+ "EXT3-fs: Magic mismatch, very weird !\n");
+ goto failed_mount;
+ }
+ }
+
+ if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
+ sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
+ sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
+ } else {
+ sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
+ sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
+ if (sbi->s_inode_size != EXT3_GOOD_OLD_INODE_SIZE) {
+ printk (KERN_ERR
+ "EXT3-fs: unsupported inode size: %d\n",
+ sbi->s_inode_size);
+ goto failed_mount;
+ }
+ }
+ sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
+ le32_to_cpu(es->s_log_frag_size);
+ if (blocksize != sbi->s_frag_size) {
+ printk(KERN_ERR
+ "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
+ sbi->s_frag_size, blocksize);
+ goto failed_mount;
+ }
+ sbi->s_frags_per_block = 1;
+ sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
+ sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
+ sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
+ sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
+ sbi->s_itb_per_group = sbi->s_inodes_per_group /sbi->s_inodes_per_block;
+ sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
+ sbi->s_sbh = bh;
+ if (sbi->s_resuid == EXT3_DEF_RESUID)
+ sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
+ if (sbi->s_resgid == EXT3_DEF_RESGID)
+ sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
+ sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
+
+ if (sbi->s_blocks_per_group > blocksize * 8) {
+ printk (KERN_ERR
+ "EXT3-fs: #blocks per group too big: %lu\n",
+ sbi->s_blocks_per_group);
+ goto failed_mount;
+ }
+ if (sbi->s_frags_per_group > blocksize * 8) {
+ printk (KERN_ERR
+ "EXT3-fs: #fragments per group too big: %lu\n",
+ sbi->s_frags_per_group);
+ goto failed_mount;
+ }
+ if (sbi->s_inodes_per_group > blocksize * 8) {
+ printk (KERN_ERR
+ "EXT3-fs: #inodes per group too big: %lu\n",
+ sbi->s_inodes_per_group);
+ goto failed_mount;
+ }
+
+ sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
+ le32_to_cpu(es->s_first_data_block) +
+ EXT3_BLOCKS_PER_GROUP(sb) - 1) /
+ EXT3_BLOCKS_PER_GROUP(sb);
+ db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
+ EXT3_DESC_PER_BLOCK(sb);
+ sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
+ GFP_KERNEL);
+ if (sbi->s_group_desc == NULL) {
+ printk (KERN_ERR "EXT3-fs: not enough memory\n");
+ goto failed_mount;
+ }
+ for (i = 0; i < db_count; i++) {
+ sbi->s_group_desc[i] = bread(dev, logic_sb_block + i + 1,
+ blocksize);
+ if (!sbi->s_group_desc[i]) {
+ printk (KERN_ERR "EXT3-fs: "
+ "can't read group descriptor %d\n", i);
+ db_count = i;
+ goto failed_mount2;
+ }
+ }
+ if (!ext3_check_descriptors (sb)) {
+ printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
+ goto failed_mount2;
+ }
+ for (i = 0; i < EXT3_MAX_GROUP_LOADED; i++) {
+ sbi->s_inode_bitmap_number[i] = 0;
+ sbi->s_inode_bitmap[i] = NULL;
+ sbi->s_block_bitmap_number[i] = 0;
+ sbi->s_block_bitmap[i] = NULL;
+ }
+ sbi->s_loaded_inode_bitmaps = 0;
+ sbi->s_loaded_block_bitmaps = 0;
+ sbi->s_gdb_count = db_count;
+ /*
+ * set up enough so that it can read an inode
+ */
+ sb->s_op = &ext3_sops;
+ INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
+
+ sb->s_root = 0;
+
+ needs_recovery = (es->s_last_orphan != 0 ||
+ EXT3_HAS_INCOMPAT_FEATURE(sb,
+ EXT3_FEATURE_INCOMPAT_RECOVER));
+
+ /*
+ * The first inode we look at is the journal inode. Don't try
+ * root first: it may be modified in the journal!
+ */
+ if (!test_opt(sb, NOLOAD) &&
+ EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
+ if (ext3_load_journal(sb, es))
+ goto failed_mount2;
+ } else if (journal_inum) {
+ if (ext3_create_journal(sb, es, journal_inum))
+ goto failed_mount2;
+ } else {
+ if (!silent)
+ printk (KERN_ERR
+ "ext3: No journal on filesystem on %s\n",
+ bdevname(dev));
+ goto failed_mount2;
+ }
+
+ /* We have now updated the journal if required, so we can
+ * validate the data journaling mode. */
+ switch (test_opt(sb, DATA_FLAGS)) {
+ case 0:
+ /* No mode set, assume a default based on the journal
+ capabilities: ORDERED_DATA if the journal can
+ cope, else JOURNAL_DATA */
+ if (journal_check_available_features
+ (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
+ set_opt(sbi->s_mount_opt, ORDERED_DATA);
+ else
+ set_opt(sbi->s_mount_opt, JOURNAL_DATA);
+ break;
+
+ case EXT3_MOUNT_ORDERED_DATA:
+ case EXT3_MOUNT_WRITEBACK_DATA:
+ if (!journal_check_available_features
+ (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
+ printk(KERN_ERR "EXT3-fs: Journal does not support "
+ "requested data journaling mode\n");
+ goto failed_mount3;
+ }
+ default:
+ break;
+ }
+
+ /*
+ * The journal_load will have done any necessary log recovery,
+ * so we can safely mount the rest of the filesystem now.
+ */
+
+ sb->s_root = d_alloc_root(iget(sb, EXT3_ROOT_INO));
+ if (!sb->s_root || !S_ISDIR(sb->s_root->d_inode->i_mode) ||
+ !sb->s_root->d_inode->i_blocks || !sb->s_root->d_inode->i_size) {
+ if (sb->s_root) {
+ dput(sb->s_root);
+ sb->s_root = NULL;
+ printk(KERN_ERR
+ "EXT3-fs: corrupt root inode, run e2fsck\n");
+ } else
+ printk(KERN_ERR "EXT3-fs: get root inode failed\n");
+ goto failed_mount3;
+ }
+
+ ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
+ /*
+ * akpm: core read_super() calls in here with the superblock locked.
+ * That deadlocks, because orphan cleanup needs to lock the superblock
+ * in numerous places. Here we just pop the lock - it's relatively
+ * harmless, because we are now ready to accept write_super() requests,
+ * and aviro says that's the only reason for hanging onto the
+ * superblock lock.
+ */
+ EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
+ unlock_super(sb); /* akpm: sigh */
+ ext3_orphan_cleanup(sb, es);
+ lock_super(sb);
+ EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
+ if (needs_recovery)
+ printk (KERN_INFO "EXT3-fs: recovery complete.\n");
+ ext3_mark_recovery_complete(sb, es);
+ printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
+ test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
+ test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
+ "writeback");
+
+ return sb;
+
+failed_mount3:
+ journal_destroy(sbi->s_journal);
+failed_mount2:
+ for (i = 0; i < db_count; i++)
+ brelse(sbi->s_group_desc[i]);
+ kfree(sbi->s_group_desc);
+failed_mount:
+ ext3_blkdev_remove(sbi);
+ brelse(bh);
+out_fail:
+ return NULL;
+}
+
+static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
+{
+ struct inode *journal_inode;
+ journal_t *journal;
+
+ /* First, test for the existence of a valid inode on disk. Bad
+ * things happen if we iget() an unused inode, as the subsequent
+ * iput() will try to delete it. */
+
+ journal_inode = iget(sb, journal_inum);
+ if (!journal_inode) {
+ printk(KERN_ERR "EXT3-fs: no journal found.\n");
+ return NULL;
+ }
+ if (!journal_inode->i_nlink) {
+ make_bad_inode(journal_inode);
+ iput(journal_inode);
+ printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
+ return NULL;
+ }
+
+ jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
+ journal_inode, journal_inode->i_size);
+ if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
+ printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
+ iput(journal_inode);
+ return NULL;
+ }
+
+ journal = journal_init_inode(journal_inode);
+ if (!journal)
+ iput(journal_inode);
+ return journal;
+}
+
+static journal_t *ext3_get_dev_journal(struct super_block *sb,
+ int dev)
+{
+ struct buffer_head * bh;
+ journal_t *journal;
+ int start;
+ int len;
+ int hblock, blocksize;
+ unsigned long sb_block;
+ unsigned long offset;
+ kdev_t journal_dev = to_kdev_t(dev);
+ struct ext3_super_block * es;
+ struct block_device *bdev;
+
+ bdev = ext3_blkdev_get(journal_dev);
+ if (bdev == NULL)
+ return NULL;
+
+ blocksize = sb->s_blocksize;
+ hblock = get_hardsect_size(journal_dev);
+ if (blocksize < hblock) {
+ printk(KERN_ERR
+ "EXT3-fs: blocksize too small for journal device.\n");
+ goto out_bdev;
+ }
+
+ sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
+ offset = EXT3_MIN_BLOCK_SIZE % blocksize;
+ set_blocksize(dev, blocksize);
+ if (!(bh = bread(dev, sb_block, blocksize))) {
+ printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
+ "external journal\n");
+ goto out_bdev;
+ }
+
+ es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
+ if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
+ !(le32_to_cpu(es->s_feature_incompat) &
+ EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
+ printk(KERN_ERR "EXT3-fs: external journal has "
+ "bad superblock\n");
+ brelse(bh);
+ goto out_bdev;
+ }
+
+ if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
+ printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
+ brelse(bh);
+ goto out_bdev;
+ }
+
+ len = le32_to_cpu(es->s_blocks_count);
+ start = sb_block + 1;
+ brelse(bh); /* we're done with the superblock */
+
+ journal = journal_init_dev(journal_dev, sb->s_dev,
+ start, len, blocksize);
+ if (!journal) {
+ printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
+ goto out_bdev;
+ }
+ ll_rw_block(READ, 1, &journal->j_sb_buffer);
+ wait_on_buffer(journal->j_sb_buffer);
+ if (!buffer_uptodate(journal->j_sb_buffer)) {
+ printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
+ goto out_journal;
+ }
+ if (ntohl(journal->j_superblock->s_nr_users) != 1) {
+ printk(KERN_ERR "EXT3-fs: External journal has more than one "
+ "user (unsupported) - %d\n",
+ ntohl(journal->j_superblock->s_nr_users));
+ goto out_journal;
+ }
+ EXT3_SB(sb)->journal_bdev = bdev;
+ return journal;
+out_journal:
+ journal_destroy(journal);
+out_bdev:
+ ext3_blkdev_put(bdev);
+ return NULL;
+}
+
+static int ext3_load_journal(struct super_block * sb,
+ struct ext3_super_block * es)
+{
+ journal_t *journal;
+ int journal_inum = le32_to_cpu(es->s_journal_inum);
+ int journal_dev = le32_to_cpu(es->s_journal_dev);
+ int err;
+ int really_read_only;
+
+ really_read_only = is_read_only(sb->s_dev);
+
+ /*
+ * Are we loading a blank journal or performing recovery after a
+ * crash? For recovery, we need to check in advance whether we
+ * can get read-write access to the device.
+ */
+
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
+ if (sb->s_flags & MS_RDONLY) {
+ printk(KERN_INFO "EXT3-fs: INFO: recovery "
+ "required on readonly filesystem.\n");
+ if (really_read_only) {
+ printk(KERN_ERR "EXT3-fs: write access "
+ "unavailable, cannot proceed.\n");
+ return -EROFS;
+ }
+ printk (KERN_INFO "EXT3-fs: write access will "
+ "be enabled during recovery.\n");
+ }
+ }
+
+ if (journal_inum && journal_dev) {
+ printk(KERN_ERR "EXT3-fs: filesystem has both journal "
+ "and inode journals!\n");
+ return -EINVAL;
+ }
+
+ if (journal_inum) {
+ if (!(journal = ext3_get_journal(sb, journal_inum)))
+ return -EINVAL;
+ } else {
+ if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
+ return -EINVAL;
+ }
+
+
+ if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
+ err = journal_update_format(journal);
+ if (err) {
+ printk(KERN_ERR "EXT3-fs: error updating journal.\n");
+ journal_destroy(journal);
+ return err;
+ }
+ }
+
+ if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
+ journal_wipe(journal, !really_read_only);
+
+ err = journal_load(journal);
+ if (err) {
+ printk(KERN_ERR "EXT3-fs: error loading journal.\n");
+ journal_destroy(journal);
+ return err;
+ }
+
+ EXT3_SB(sb)->s_journal = journal;
+ ext3_clear_journal_err(sb, es);
+ return 0;
+}
+
+static int ext3_create_journal(struct super_block * sb,
+ struct ext3_super_block * es,
+ int journal_inum)
+{
+ journal_t *journal;
+
+ if (sb->s_flags & MS_RDONLY) {
+ printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
+ "create journal.\n");
+ return -EROFS;
+ }
+
+ if (!(journal = ext3_get_journal(sb, journal_inum)))
+ return -EINVAL;
+
+ printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
+ journal_inum);
+
+ if (journal_create(journal)) {
+ printk(KERN_ERR "EXT3-fs: error creating journal.\n");
+ journal_destroy(journal);
+ return -EIO;
+ }
+
+ EXT3_SB(sb)->s_journal = journal;
+
+ ext3_update_dynamic_rev(sb);
+ EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
+
+ es->s_journal_inum = cpu_to_le32(journal_inum);
+ sb->s_dirt = 1;
+
+ /* Make sure we flush the recovery flag to disk. */
+ ext3_commit_super(sb, es, 1);
+
+ return 0;
+}
+
+static void ext3_commit_super (struct super_block * sb,
+ struct ext3_super_block * es,
+ int sync)
+{
+ es->s_wtime = cpu_to_le32(CURRENT_TIME);
+ BUFFER_TRACE(sb->u.ext3_sb.s_sbh, "marking dirty");
+ mark_buffer_dirty(sb->u.ext3_sb.s_sbh);
+ if (sync) {
+ ll_rw_block(WRITE, 1, &sb->u.ext3_sb.s_sbh);
+ wait_on_buffer(sb->u.ext3_sb.s_sbh);
+ }
+}
+
+
+/*
+ * Have we just finished recovery? If so, and if we are mounting (or
+ * remounting) the filesystem readonly, then we will end up with a
+ * consistent fs on disk. Record that fact.
+ */
+static void ext3_mark_recovery_complete(struct super_block * sb,
+ struct ext3_super_block * es)
+{
+ journal_flush(EXT3_SB(sb)->s_journal);
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
+ sb->s_flags & MS_RDONLY) {
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ sb->s_dirt = 0;
+ ext3_commit_super(sb, es, 1);
+ }
+}
+
+/*
+ * If we are mounting (or read-write remounting) a filesystem whose journal
+ * has recorded an error from a previous lifetime, move that error to the
+ * main filesystem now.
+ */
+static void ext3_clear_journal_err(struct super_block * sb,
+ struct ext3_super_block * es)
+{
+ journal_t *journal;
+ int j_errno;
+ const char *errstr;
+
+ journal = EXT3_SB(sb)->s_journal;
+
+ /*
+ * Now check for any error status which may have been recorded in the
+ * journal by a prior ext3_error() or ext3_abort()
+ */
+
+ j_errno = journal_errno(journal);
+ if (j_errno) {
+ char nbuf[16];
+
+ errstr = ext3_decode_error(sb, j_errno, nbuf);
+ ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
+ "from previous mount: %s", errstr);
+ ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
+ "filesystem check.");
+
+ sb->u.ext3_sb.s_mount_state |= EXT3_ERROR_FS;
+ es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
+ ext3_commit_super (sb, es, 1);
+
+ journal_clear_err(journal);
+ }
+}
+
+/*
+ * Force the running and committing transactions to commit,
+ * and wait on the commit.
+ */
+int ext3_force_commit(struct super_block *sb)
+{
+ journal_t *journal;
+ int ret;
+
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ journal = EXT3_SB(sb)->s_journal;
+ sb->s_dirt = 0;
+ lock_kernel(); /* important: lock down j_running_transaction */
+ ret = ext3_journal_force_commit(journal);
+ unlock_kernel();
+ return ret;
+}
+
+/*
+ * Ext3 always journals updates to the superblock itself, so we don't
+ * have to propagate any other updates to the superblock on disk at this
+ * point. Just start an async writeback to get the buffers on their way
+ * to the disk.
+ *
+ * This implicitly triggers the writebehind on sync().
+ */
+
+static int do_sync_supers = 0;
+MODULE_PARM(do_sync_supers, "i");
+MODULE_PARM_DESC(do_sync_supers, "Write superblocks synchronously");
+
+void ext3_write_super (struct super_block * sb)
+{
+ tid_t target;
+
+ if (down_trylock(&sb->s_lock) == 0)
+ BUG(); /* aviro detector */
+ sb->s_dirt = 0;
+ target = log_start_commit(EXT3_SB(sb)->s_journal, NULL);
+
+ if (do_sync_supers) {
+ unlock_super(sb);
+ log_wait_commit(EXT3_SB(sb)->s_journal, target);
+ lock_super(sb);
+ }
+}
+
+/*
+ * LVM calls this function before a (read-only) snapshot is created. This
+ * gives us a chance to flush the journal completely and mark the fs clean.
+ */
+void ext3_write_super_lockfs(struct super_block *sb)
+{
+ sb->s_dirt = 0;
+
+ lock_kernel(); /* 2.4.5 forgot to do this for us */
+ if (!(sb->s_flags & MS_RDONLY)) {
+ journal_t *journal = EXT3_SB(sb)->s_journal;
+
+ /* Now we set up the journal barrier. */
+ journal_lock_updates(journal);
+ journal_flush(journal);
+
+ /* Journal blocked and flushed, clear needs_recovery flag. */
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+ }
+ unlock_kernel();
+}
+
+/*
+ * Called by LVM after the snapshot is done. We need to reset the RECOVER
+ * flag here, even though the filesystem is not technically dirty yet.
+ */
+void ext3_unlockfs(struct super_block *sb)
+{
+ if (!(sb->s_flags & MS_RDONLY)) {
+ lock_kernel();
+ lock_super(sb);
+ /* Reser the needs_recovery flag before the fs is unlocked. */
+ EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+ unlock_super(sb);
+ journal_unlock_updates(EXT3_SB(sb)->s_journal);
+ unlock_kernel();
+ }
+}
+
+int ext3_remount (struct super_block * sb, int * flags, char * data)
+{
+ struct ext3_super_block * es;
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ unsigned long tmp;
+
+ clear_ro_after(sb);
+
+ /*
+ * Allow the "check" option to be passed as a remount option.
+ */
+ if (!parse_options(data, &tmp, sbi, &tmp, 1))
+ return -EINVAL;
+
+ if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
+ ext3_abort(sb, __FUNCTION__, "Abort forced by user");
+
+ es = sbi->s_es;
+
+ if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
+ if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
+ return -EROFS;
+
+ if (*flags & MS_RDONLY) {
+ /*
+ * First of all, the unconditional stuff we have to do
+ * to disable replay of the journal when we next remount
+ */
+ sb->s_flags |= MS_RDONLY;
+
+ /*
+ * OK, test if we are remounting a valid rw partition
+ * readonly, and if so set the rdonly flag and then
+ * mark the partition as valid again.
+ */
+ if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
+ (sbi->s_mount_state & EXT3_VALID_FS))
+ es->s_state = cpu_to_le16(sbi->s_mount_state);
+
+ ext3_mark_recovery_complete(sb, es);
+ } else {
+ int ret;
+ if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
+ ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
+ printk(KERN_WARNING "EXT3-fs: %s: couldn't "
+ "remount RDWR because of unsupported "
+ "optional features (%x).\n",
+ bdevname(sb->s_dev), ret);
+ return -EROFS;
+ }
+ /*
+ * Mounting a RDONLY partition read-write, so reread
+ * and store the current valid flag. (It may have
+ * been changed by e2fsck since we originally mounted
+ * the partition.)
+ */
+ ext3_clear_journal_err(sb, es);
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ if (!ext3_setup_super (sb, es, 0))
+ sb->s_flags &= ~MS_RDONLY;
+ }
+ }
+ setup_ro_after(sb);
+ return 0;
+}
+
+int ext3_statfs (struct super_block * sb, struct statfs * buf)
+{
+ struct ext3_super_block *es = EXT3_SB(sb)->s_es;
+ unsigned long overhead;
+ int i;
+
+ if (test_opt (sb, MINIX_DF))
+ overhead = 0;
+ else {
+ /*
+ * Compute the overhead (FS structures)
+ */
+
+ /*
+ * All of the blocks before first_data_block are
+ * overhead
+ */
+ overhead = le32_to_cpu(es->s_first_data_block);
+
+ /*
+ * Add the overhead attributed to the superblock and
+ * block group descriptors. If the sparse superblocks
+ * feature is turned on, then not all groups have this.
+ */
+ for (i = 0; i < EXT3_SB(sb)->s_groups_count; i++)
+ overhead += ext3_bg_has_super(sb, i) +
+ ext3_bg_num_gdb(sb, i);
+
+ /*
+ * Every block group has an inode bitmap, a block
+ * bitmap, and an inode table.
+ */
+ overhead += (EXT3_SB(sb)->s_groups_count *
+ (2 + EXT3_SB(sb)->s_itb_per_group));
+ }
+
+ buf->f_type = EXT3_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
+ buf->f_bfree = ext3_count_free_blocks (sb);
+ buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
+ if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
+ buf->f_bavail = 0;
+ buf->f_files = le32_to_cpu(es->s_inodes_count);
+ buf->f_ffree = ext3_count_free_inodes (sb);
+ buf->f_namelen = EXT3_NAME_LEN;
+ return 0;
+}
+
+static DECLARE_FSTYPE_DEV(ext3_fs_type, "ext3", ext3_read_super);
+
+static int __init init_ext3_fs(void)
+{
+ return register_filesystem(&ext3_fs_type);
+}
+
+static void __exit exit_ext3_fs(void)
+{
+ unregister_filesystem(&ext3_fs_type);
+}
+
+EXPORT_NO_SYMBOLS;
+
+MODULE_LICENSE("GPL");
+module_init(init_ext3_fs)
+module_exit(exit_ext3_fs)
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)