--- /dev/null
+/*
+ * 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/module.h>
+#include <linux/blkdev.h>
+#include <linux/parser.h>
+#include <linux/exportfs.h>
+#include <linux/statfs.h>
+#include <linux/random.h>
+#include <linux/mount.h>
+#include <linux/quotaops.h>
+#include <linux/seq_file.h>
+#include <linux/log2.h>
+#include <linux/cleancache.h>
+#include <linux/namei.h>
+
+#include <asm/uaccess.h>
+
+#define CREATE_TRACE_POINTS
+
+#include "ext3.h"
+#include "xattr.h"
+#include "acl.h"
+#include "namei.h"
+
+#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
+ #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
+#else
+ #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
+#endif
+
+static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
+ unsigned long journal_devnum);
+static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
+ unsigned int);
+static int 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);
+static int ext3_sync_fs(struct super_block *sb, int wait);
+static const char *ext3_decode_error(struct super_block * sb, int errno,
+ char nbuf[16]);
+static int ext3_remount (struct super_block * sb, int * flags, char * data);
+static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
+static int ext3_unfreeze(struct super_block *sb);
+static int ext3_freeze(struct super_block *sb);
+
+/*
+ * Wrappers for journal_start/end.
+ */
+handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
+{
+ journal_t *journal;
+
+ if (sb->s_flags & MS_RDONLY)
+ return ERR_PTR(-EROFS);
+
+ /* Special case here: if the journal has aborted behind our
+ * backs (eg. EIO in the commit thread), then we still need to
+ * take the FS itself readonly cleanly. */
+ journal = EXT3_SB(sb)->s_journal;
+ if (is_journal_aborted(journal)) {
+ ext3_abort(sb, __func__,
+ "Detected aborted journal");
+ return ERR_PTR(-EROFS);
+ }
+
+ return journal_start(journal, nblocks);
+}
+
+int __ext3_journal_stop(const char *where, handle_t *handle)
+{
+ struct super_block *sb;
+ int err;
+ int rc;
+
+ sb = handle->h_transaction->t_journal->j_private;
+ err = handle->h_err;
+ rc = journal_stop(handle);
+
+ if (!err)
+ err = rc;
+ if (err)
+ __ext3_std_error(sb, where, err);
+ return err;
+}
+
+void ext3_journal_abort_handle(const char *caller, const char *err_fn,
+ struct buffer_head *bh, handle_t *handle, int err)
+{
+ char nbuf[16];
+ const char *errstr = ext3_decode_error(NULL, err, nbuf);
+
+ if (bh)
+ BUFFER_TRACE(bh, "abort");
+
+ if (!handle->h_err)
+ handle->h_err = err;
+
+ if (is_handle_aborted(handle))
+ return;
+
+ printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n",
+ caller, errstr, err_fn);
+
+ journal_abort_handle(handle);
+}
+
+void ext3_msg(struct super_block *sb, const char *prefix,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
+
+ va_end(args);
+}
+
+/* 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 complain 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_le16(EXT3_ERROR_FS);
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ if (!test_opt (sb, ERRORS_CONT)) {
+ journal_t *journal = EXT3_SB(sb)->s_journal;
+
+ set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
+ if (journal)
+ journal_abort(journal, -EIO);
+ }
+ if (test_opt (sb, ERRORS_RO)) {
+ ext3_msg(sb, KERN_CRIT,
+ "error: remounting filesystem read-only");
+ /*
+ * Make sure updated value of ->s_mount_state will be visible
+ * before ->s_flags update.
+ */
+ smp_wmb();
+ sb->s_flags |= MS_RDONLY;
+ }
+ ext3_commit_super(sb, es, 1);
+ if (test_opt(sb, ERRORS_PANIC))
+ panic("EXT3-fs (%s): panic forced after error\n",
+ sb->s_id);
+}
+
+void ext3_error(struct super_block *sb, const char *function,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n",
+ sb->s_id, function, &vaf);
+
+ va_end(args);
+
+ ext3_handle_error(sb);
+}
+
+static 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;
+
+ /* Special case: if the error is EROFS, and we're not already
+ * inside a transaction, then there's really no point in logging
+ * an error. */
+ if (errno == -EROFS && journal_current_handle() == NULL &&
+ (sb->s_flags & MS_RDONLY))
+ return;
+
+ errstr = ext3_decode_error(sb, errno, nbuf);
+ ext3_msg(sb, KERN_CRIT, "error in %s: %s", 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, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n",
+ sb->s_id, function, &vaf);
+
+ va_end(args);
+
+ if (test_opt(sb, ERRORS_PANIC))
+ panic("EXT3-fs: panic from previous error\n");
+
+ if (sb->s_flags & MS_RDONLY)
+ return;
+
+ ext3_msg(sb, KERN_CRIT,
+ "error: remounting filesystem read-only");
+ EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
+ set_opt(EXT3_SB(sb)->s_mount_opt, ABORT);
+ /*
+ * Make sure updated value of ->s_mount_state will be visible
+ * before ->s_flags update.
+ */
+ smp_wmb();
+ sb->s_flags |= MS_RDONLY;
+
+ if (EXT3_SB(sb)->s_journal)
+ journal_abort(EXT3_SB(sb)->s_journal, -EIO);
+}
+
+void ext3_warning(struct super_block *sb, const char *function,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n",
+ sb->s_id, function, &vaf);
+
+ va_end(args);
+}
+
+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_msg(sb, KERN_WARNING,
+ "warning: 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(dev_t dev, struct super_block *sb)
+{
+ struct block_device *bdev;
+ char b[BDEVNAME_SIZE];
+
+ bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
+ if (IS_ERR(bdev))
+ goto fail;
+ return bdev;
+
+fail:
+ ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld",
+ __bdevname(dev, b), PTR_ERR(bdev));
+
+ return NULL;
+}
+
+/*
+ * Release the journal device
+ */
+static void ext3_blkdev_put(struct block_device *bdev)
+{
+ blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
+}
+
+static void ext3_blkdev_remove(struct ext3_sb_info *sbi)
+{
+ struct block_device *bdev;
+ bdev = sbi->journal_bdev;
+ if (bdev) {
+ ext3_blkdev_put(bdev);
+ sbi->journal_bdev = NULL;
+ }
+}
+
+static inline struct inode *orphan_list_entry(struct list_head *l)
+{
+ return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
+}
+
+static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
+{
+ struct list_head *l;
+
+ ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d",
+ le32_to_cpu(sbi->s_es->s_last_orphan));
+
+ ext3_msg(sb, KERN_ERR, "sb_info orphan list:");
+ list_for_each(l, &sbi->s_orphan) {
+ struct inode *inode = orphan_list_entry(l);
+ ext3_msg(sb, KERN_ERR, " "
+ "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
+ inode->i_sb->s_id, inode->i_ino, inode,
+ inode->i_mode, inode->i_nlink,
+ NEXT_ORPHAN(inode));
+ }
+}
+
+static void ext3_put_super (struct super_block * sb)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ int i, err;
+
+ dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
+ ext3_xattr_put_super(sb);
+ err = journal_destroy(sbi->s_journal);
+ sbi->s_journal = NULL;
+ if (err < 0)
+ ext3_abort(sb, __func__, "Couldn't clean up the journal");
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ es->s_state = cpu_to_le16(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);
+ percpu_counter_destroy(&sbi->s_freeblocks_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ brelse(sbi->s_sbh);
+#ifdef CONFIG_QUOTA
+ for (i = 0; i < EXT3_MAXQUOTAS; i++)
+ kfree(sbi->s_qf_names[i]);
+#endif
+
+ /* 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_bdev(sb->s_bdev);
+ if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
+ /*
+ * 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.
+ */
+ sync_blockdev(sbi->journal_bdev);
+ invalidate_bdev(sbi->journal_bdev);
+ ext3_blkdev_remove(sbi);
+ }
+ sb->s_fs_info = NULL;
+ kfree(sbi->s_blockgroup_lock);
+ mutex_destroy(&sbi->s_orphan_lock);
+ mutex_destroy(&sbi->s_resize_lock);
+ kfree(sbi);
+}
+
+static struct kmem_cache *ext3_inode_cachep;
+
+/*
+ * Called inside transaction, so use GFP_NOFS
+ */
+static struct inode *ext3_alloc_inode(struct super_block *sb)
+{
+ struct ext3_inode_info *ei;
+
+ ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
+ if (!ei)
+ return NULL;
+ ei->i_block_alloc_info = NULL;
+ ei->vfs_inode.i_version = 1;
+ atomic_set(&ei->i_datasync_tid, 0);
+ atomic_set(&ei->i_sync_tid, 0);
+#ifdef CONFIG_QUOTA
+ memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
+#endif
+
+ return &ei->vfs_inode;
+}
+
+static int ext3_drop_inode(struct inode *inode)
+{
+ int drop = generic_drop_inode(inode);
+
+ trace_ext3_drop_inode(inode, drop);
+ return drop;
+}
+
+static void ext3_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
+}
+
+static void ext3_destroy_inode(struct inode *inode)
+{
+ if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
+ printk("EXT3 Inode %p: orphan list check failed!\n",
+ EXT3_I(inode));
+ print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
+ EXT3_I(inode), sizeof(struct ext3_inode_info),
+ false);
+ dump_stack();
+ }
+ call_rcu(&inode->i_rcu, ext3_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
+
+ INIT_LIST_HEAD(&ei->i_orphan);
+#ifdef CONFIG_EXT3_FS_XATTR
+ init_rwsem(&ei->xattr_sem);
+#endif
+ mutex_init(&ei->truncate_mutex);
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+ ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
+ sizeof(struct ext3_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once);
+ if (ext3_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(ext3_inode_cachep);
+}
+
+static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
+{
+#if defined(CONFIG_QUOTA)
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+
+ if (sbi->s_jquota_fmt) {
+ char *fmtname = "";
+
+ switch (sbi->s_jquota_fmt) {
+ case QFMT_VFS_OLD:
+ fmtname = "vfsold";
+ break;
+ case QFMT_VFS_V0:
+ fmtname = "vfsv0";
+ break;
+ case QFMT_VFS_V1:
+ fmtname = "vfsv1";
+ break;
+ }
+ seq_printf(seq, ",jqfmt=%s", fmtname);
+ }
+
+ if (sbi->s_qf_names[USRQUOTA])
+ seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
+
+ if (sbi->s_qf_names[GRPQUOTA])
+ seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
+
+ if (test_opt(sb, USRQUOTA))
+ seq_puts(seq, ",usrquota");
+
+ if (test_opt(sb, GRPQUOTA))
+ seq_puts(seq, ",grpquota");
+#endif
+}
+
+static char *data_mode_string(unsigned long mode)
+{
+ switch (mode) {
+ case EXT3_MOUNT_JOURNAL_DATA:
+ return "journal";
+ case EXT3_MOUNT_ORDERED_DATA:
+ return "ordered";
+ case EXT3_MOUNT_WRITEBACK_DATA:
+ return "writeback";
+ }
+ return "unknown";
+}
+
+/*
+ * Show an option if
+ * - it's set to a non-default value OR
+ * - if the per-sb default is different from the global default
+ */
+static int ext3_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct super_block *sb = root->d_sb;
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ unsigned long def_mount_opts;
+
+ def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+
+ if (sbi->s_sb_block != 1)
+ seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
+ if (test_opt(sb, MINIX_DF))
+ seq_puts(seq, ",minixdf");
+ if (test_opt(sb, GRPID))
+ seq_puts(seq, ",grpid");
+ if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
+ seq_puts(seq, ",nogrpid");
+ if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) ||
+ le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
+ seq_printf(seq, ",resuid=%u",
+ from_kuid_munged(&init_user_ns, sbi->s_resuid));
+ }
+ if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) ||
+ le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
+ seq_printf(seq, ",resgid=%u",
+ from_kgid_munged(&init_user_ns, sbi->s_resgid));
+ }
+ if (test_opt(sb, ERRORS_RO)) {
+ int def_errors = le16_to_cpu(es->s_errors);
+
+ if (def_errors == EXT3_ERRORS_PANIC ||
+ def_errors == EXT3_ERRORS_CONTINUE) {
+ seq_puts(seq, ",errors=remount-ro");
+ }
+ }
+ if (test_opt(sb, ERRORS_CONT))
+ seq_puts(seq, ",errors=continue");
+ if (test_opt(sb, ERRORS_PANIC))
+ seq_puts(seq, ",errors=panic");
+ if (test_opt(sb, NO_UID32))
+ seq_puts(seq, ",nouid32");
+ if (test_opt(sb, DEBUG))
+ seq_puts(seq, ",debug");
+#ifdef CONFIG_EXT3_FS_XATTR
+ if (test_opt(sb, XATTR_USER))
+ seq_puts(seq, ",user_xattr");
+ if (!test_opt(sb, XATTR_USER) &&
+ (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
+ seq_puts(seq, ",nouser_xattr");
+ }
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+ if (test_opt(sb, POSIX_ACL))
+ seq_puts(seq, ",acl");
+ if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
+ seq_puts(seq, ",noacl");
+#endif
+ if (!test_opt(sb, RESERVATION))
+ seq_puts(seq, ",noreservation");
+ if (sbi->s_commit_interval) {
+ seq_printf(seq, ",commit=%u",
+ (unsigned) (sbi->s_commit_interval / HZ));
+ }
+
+ /*
+ * Always display barrier state so it's clear what the status is.
+ */
+ seq_puts(seq, ",barrier=");
+ seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
+ seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS)));
+ if (test_opt(sb, DATA_ERR_ABORT))
+ seq_puts(seq, ",data_err=abort");
+
+ if (test_opt(sb, NOLOAD))
+ seq_puts(seq, ",norecovery");
+
+ ext3_show_quota_options(seq, sb);
+
+ return 0;
+}
+
+
+static struct inode *ext3_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
+ return ERR_PTR(-ESTALE);
+ if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
+ return ERR_PTR(-ESTALE);
+
+ /* iget isn't really right if the inode is currently unallocated!!
+ *
+ * ext3_read_inode will return a bad_inode if the inode had been
+ * deleted, so we should be safe.
+ *
+ * Currently we don't know the generation for parent directory, so
+ * a generation of 0 means "accept any"
+ */
+ inode = ext3_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+
+ return inode;
+}
+
+static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ ext3_nfs_get_inode);
+}
+
+static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ ext3_nfs_get_inode);
+}
+
+/*
+ * Try to release metadata pages (indirect blocks, directories) which are
+ * mapped via the block device. Since these pages could have journal heads
+ * which would prevent try_to_free_buffers() from freeing them, we must use
+ * jbd layer's try_to_free_buffers() function to release them.
+ */
+static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
+ gfp_t wait)
+{
+ journal_t *journal = EXT3_SB(sb)->s_journal;
+
+ WARN_ON(PageChecked(page));
+ if (!page_has_buffers(page))
+ return 0;
+ if (journal)
+ return journal_try_to_free_buffers(journal, page,
+ wait & ~__GFP_WAIT);
+ return try_to_free_buffers(page);
+}
+
+#ifdef CONFIG_QUOTA
+#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
+#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
+
+static int ext3_write_dquot(struct dquot *dquot);
+static int ext3_acquire_dquot(struct dquot *dquot);
+static int ext3_release_dquot(struct dquot *dquot);
+static int ext3_mark_dquot_dirty(struct dquot *dquot);
+static int ext3_write_info(struct super_block *sb, int type);
+static int ext3_quota_on(struct super_block *sb, int type, int format_id,
+ struct path *path);
+static int ext3_quota_on_mount(struct super_block *sb, int type);
+static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off);
+static ssize_t ext3_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off);
+static struct dquot **ext3_get_dquots(struct inode *inode)
+{
+ return EXT3_I(inode)->i_dquot;
+}
+
+static const struct dquot_operations ext3_quota_operations = {
+ .write_dquot = ext3_write_dquot,
+ .acquire_dquot = ext3_acquire_dquot,
+ .release_dquot = ext3_release_dquot,
+ .mark_dirty = ext3_mark_dquot_dirty,
+ .write_info = ext3_write_info,
+ .alloc_dquot = dquot_alloc,
+ .destroy_dquot = dquot_destroy,
+};
+
+static const struct quotactl_ops ext3_qctl_operations = {
+ .quota_on = ext3_quota_on,
+ .quota_off = dquot_quota_off,
+ .quota_sync = dquot_quota_sync,
+ .get_state = dquot_get_state,
+ .set_info = dquot_set_dqinfo,
+ .get_dqblk = dquot_get_dqblk,
+ .set_dqblk = dquot_set_dqblk
+};
+#endif
+
+static const struct super_operations ext3_sops = {
+ .alloc_inode = ext3_alloc_inode,
+ .destroy_inode = ext3_destroy_inode,
+ .write_inode = ext3_write_inode,
+ .dirty_inode = ext3_dirty_inode,
+ .drop_inode = ext3_drop_inode,
+ .evict_inode = ext3_evict_inode,
+ .put_super = ext3_put_super,
+ .sync_fs = ext3_sync_fs,
+ .freeze_fs = ext3_freeze,
+ .unfreeze_fs = ext3_unfreeze,
+ .statfs = ext3_statfs,
+ .remount_fs = ext3_remount,
+ .show_options = ext3_show_options,
+#ifdef CONFIG_QUOTA
+ .quota_read = ext3_quota_read,
+ .quota_write = ext3_quota_write,
+ .get_dquots = ext3_get_dquots,
+#endif
+ .bdev_try_to_free_page = bdev_try_to_free_page,
+};
+
+static const struct export_operations ext3_export_ops = {
+ .fh_to_dentry = ext3_fh_to_dentry,
+ .fh_to_parent = ext3_fh_to_parent,
+ .get_parent = ext3_get_parent,
+};
+
+enum {
+ Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
+ Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
+ Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
+ Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
+ Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
+ Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
+ Opt_journal_path,
+ Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
+ Opt_data_err_abort, Opt_data_err_ignore,
+ Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
+ Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
+ Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
+ Opt_resize, Opt_usrquota, Opt_grpquota
+};
+
+static const match_table_t tokens = {
+ {Opt_bsd_df, "bsddf"},
+ {Opt_minix_df, "minixdf"},
+ {Opt_grpid, "grpid"},
+ {Opt_grpid, "bsdgroups"},
+ {Opt_nogrpid, "nogrpid"},
+ {Opt_nogrpid, "sysvgroups"},
+ {Opt_resgid, "resgid=%u"},
+ {Opt_resuid, "resuid=%u"},
+ {Opt_sb, "sb=%u"},
+ {Opt_err_cont, "errors=continue"},
+ {Opt_err_panic, "errors=panic"},
+ {Opt_err_ro, "errors=remount-ro"},
+ {Opt_nouid32, "nouid32"},
+ {Opt_nocheck, "nocheck"},
+ {Opt_nocheck, "check=none"},
+ {Opt_debug, "debug"},
+ {Opt_oldalloc, "oldalloc"},
+ {Opt_orlov, "orlov"},
+ {Opt_user_xattr, "user_xattr"},
+ {Opt_nouser_xattr, "nouser_xattr"},
+ {Opt_acl, "acl"},
+ {Opt_noacl, "noacl"},
+ {Opt_reservation, "reservation"},
+ {Opt_noreservation, "noreservation"},
+ {Opt_noload, "noload"},
+ {Opt_noload, "norecovery"},
+ {Opt_nobh, "nobh"},
+ {Opt_bh, "bh"},
+ {Opt_commit, "commit=%u"},
+ {Opt_journal_update, "journal=update"},
+ {Opt_journal_inum, "journal=%u"},
+ {Opt_journal_dev, "journal_dev=%u"},
+ {Opt_journal_path, "journal_path=%s"},
+ {Opt_abort, "abort"},
+ {Opt_data_journal, "data=journal"},
+ {Opt_data_ordered, "data=ordered"},
+ {Opt_data_writeback, "data=writeback"},
+ {Opt_data_err_abort, "data_err=abort"},
+ {Opt_data_err_ignore, "data_err=ignore"},
+ {Opt_offusrjquota, "usrjquota="},
+ {Opt_usrjquota, "usrjquota=%s"},
+ {Opt_offgrpjquota, "grpjquota="},
+ {Opt_grpjquota, "grpjquota=%s"},
+ {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
+ {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
+ {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
+ {Opt_grpquota, "grpquota"},
+ {Opt_noquota, "noquota"},
+ {Opt_quota, "quota"},
+ {Opt_usrquota, "usrquota"},
+ {Opt_barrier, "barrier=%u"},
+ {Opt_barrier, "barrier"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_resize, "resize"},
+ {Opt_err, NULL},
+};
+
+static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb)
+{
+ ext3_fsblk_t sb_block;
+ char *options = (char *) *data;
+
+ if (!options || strncmp(options, "sb=", 3) != 0)
+ return 1; /* Default location */
+ options += 3;
+ /*todo: use simple_strtoll with >32bit ext3 */
+ sb_block = simple_strtoul(options, &options, 0);
+ if (*options && *options != ',') {
+ ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s",
+ (char *) *data);
+ return 1;
+ }
+ if (*options == ',')
+ options++;
+ *data = (void *) options;
+ return sb_block;
+}
+
+#ifdef CONFIG_QUOTA
+static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ char *qname;
+
+ if (sb_any_quota_loaded(sb) &&
+ !sbi->s_qf_names[qtype]) {
+ ext3_msg(sb, KERN_ERR,
+ "Cannot change journaled "
+ "quota options when quota turned on");
+ return 0;
+ }
+ qname = match_strdup(args);
+ if (!qname) {
+ ext3_msg(sb, KERN_ERR,
+ "Not enough memory for storing quotafile name");
+ return 0;
+ }
+ if (sbi->s_qf_names[qtype]) {
+ int same = !strcmp(sbi->s_qf_names[qtype], qname);
+
+ kfree(qname);
+ if (!same) {
+ ext3_msg(sb, KERN_ERR,
+ "%s quota file already specified",
+ QTYPE2NAME(qtype));
+ }
+ return same;
+ }
+ if (strchr(qname, '/')) {
+ ext3_msg(sb, KERN_ERR,
+ "quotafile must be on filesystem root");
+ kfree(qname);
+ return 0;
+ }
+ sbi->s_qf_names[qtype] = qname;
+ set_opt(sbi->s_mount_opt, QUOTA);
+ return 1;
+}
+
+static int clear_qf_name(struct super_block *sb, int qtype) {
+
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+
+ if (sb_any_quota_loaded(sb) &&
+ sbi->s_qf_names[qtype]) {
+ ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options"
+ " when quota turned on");
+ return 0;
+ }
+ if (sbi->s_qf_names[qtype]) {
+ kfree(sbi->s_qf_names[qtype]);
+ sbi->s_qf_names[qtype] = NULL;
+ }
+ return 1;
+}
+#endif
+
+static int parse_options (char *options, struct super_block *sb,
+ unsigned int *inum, unsigned long *journal_devnum,
+ ext3_fsblk_t *n_blocks_count, int is_remount)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ char * p;
+ substring_t args[MAX_OPT_ARGS];
+ int data_opt = 0;
+ int option;
+ kuid_t uid;
+ kgid_t gid;
+ char *journal_path;
+ struct inode *journal_inode;
+ struct path path;
+ int error;
+
+#ifdef CONFIG_QUOTA
+ int qfmt;
+#endif
+
+ if (!options)
+ return 1;
+
+ while ((p = strsep (&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+ /*
+ * Initialize args struct so we know whether arg was
+ * found; some options take optional arguments.
+ */
+ args[0].to = args[0].from = NULL;
+ token = match_token(p, tokens, args);
+ switch (token) {
+ case Opt_bsd_df:
+ clear_opt (sbi->s_mount_opt, MINIX_DF);
+ break;
+ case Opt_minix_df:
+ set_opt (sbi->s_mount_opt, MINIX_DF);
+ break;
+ case Opt_grpid:
+ set_opt (sbi->s_mount_opt, GRPID);
+ break;
+ case Opt_nogrpid:
+ clear_opt (sbi->s_mount_opt, GRPID);
+ break;
+ case Opt_resuid:
+ if (match_int(&args[0], &option))
+ return 0;
+ uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(uid)) {
+ ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option);
+ return 0;
+
+ }
+ sbi->s_resuid = uid;
+ break;
+ case Opt_resgid:
+ if (match_int(&args[0], &option))
+ return 0;
+ gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(gid)) {
+ ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option);
+ return 0;
+ }
+ sbi->s_resgid = gid;
+ break;
+ case Opt_sb:
+ /* handled by get_sb_block() instead of here */
+ /* *sb_block = match_int(&args[0]); */
+ break;
+ case Opt_err_panic:
+ clear_opt (sbi->s_mount_opt, ERRORS_CONT);
+ clear_opt (sbi->s_mount_opt, ERRORS_RO);
+ set_opt (sbi->s_mount_opt, ERRORS_PANIC);
+ break;
+ case Opt_err_ro:
+ clear_opt (sbi->s_mount_opt, ERRORS_CONT);
+ clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
+ set_opt (sbi->s_mount_opt, ERRORS_RO);
+ break;
+ case Opt_err_cont:
+ clear_opt (sbi->s_mount_opt, ERRORS_RO);
+ clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
+ set_opt (sbi->s_mount_opt, ERRORS_CONT);
+ break;
+ case Opt_nouid32:
+ set_opt (sbi->s_mount_opt, NO_UID32);
+ break;
+ case Opt_nocheck:
+ clear_opt (sbi->s_mount_opt, CHECK);
+ break;
+ case Opt_debug:
+ set_opt (sbi->s_mount_opt, DEBUG);
+ break;
+ case Opt_oldalloc:
+ ext3_msg(sb, KERN_WARNING,
+ "Ignoring deprecated oldalloc option");
+ break;
+ case Opt_orlov:
+ ext3_msg(sb, KERN_WARNING,
+ "Ignoring deprecated orlov option");
+ break;
+#ifdef CONFIG_EXT3_FS_XATTR
+ case Opt_user_xattr:
+ set_opt (sbi->s_mount_opt, XATTR_USER);
+ break;
+ case Opt_nouser_xattr:
+ clear_opt (sbi->s_mount_opt, XATTR_USER);
+ break;
+#else
+ case Opt_user_xattr:
+ case Opt_nouser_xattr:
+ ext3_msg(sb, KERN_INFO,
+ "(no)user_xattr options not supported");
+ break;
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+ case Opt_acl:
+ set_opt(sbi->s_mount_opt, POSIX_ACL);
+ break;
+ case Opt_noacl:
+ clear_opt(sbi->s_mount_opt, POSIX_ACL);
+ break;
+#else
+ case Opt_acl:
+ case Opt_noacl:
+ ext3_msg(sb, KERN_INFO,
+ "(no)acl options not supported");
+ break;
+#endif
+ case Opt_reservation:
+ set_opt(sbi->s_mount_opt, RESERVATION);
+ break;
+ case Opt_noreservation:
+ clear_opt(sbi->s_mount_opt, RESERVATION);
+ break;
+ case Opt_journal_update:
+ /* @@@ 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) {
+ ext3_msg(sb, KERN_ERR, "error: cannot specify "
+ "journal on remount");
+ return 0;
+ }
+ set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
+ break;
+ case Opt_journal_inum:
+ if (is_remount) {
+ ext3_msg(sb, KERN_ERR, "error: cannot specify "
+ "journal on remount");
+ return 0;
+ }
+ if (match_int(&args[0], &option))
+ return 0;
+ *inum = option;
+ break;
+ case Opt_journal_dev:
+ if (is_remount) {
+ ext3_msg(sb, KERN_ERR, "error: cannot specify "
+ "journal on remount");
+ return 0;
+ }
+ if (match_int(&args[0], &option))
+ return 0;
+ *journal_devnum = option;
+ break;
+ case Opt_journal_path:
+ if (is_remount) {
+ ext3_msg(sb, KERN_ERR, "error: cannot specify "
+ "journal on remount");
+ return 0;
+ }
+
+ journal_path = match_strdup(&args[0]);
+ if (!journal_path) {
+ ext3_msg(sb, KERN_ERR, "error: could not dup "
+ "journal device string");
+ return 0;
+ }
+
+ error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
+ if (error) {
+ ext3_msg(sb, KERN_ERR, "error: could not find "
+ "journal device path: error %d", error);
+ kfree(journal_path);
+ return 0;
+ }
+
+ journal_inode = d_inode(path.dentry);
+ if (!S_ISBLK(journal_inode->i_mode)) {
+ ext3_msg(sb, KERN_ERR, "error: journal path %s "
+ "is not a block device", journal_path);
+ path_put(&path);
+ kfree(journal_path);
+ return 0;
+ }
+
+ *journal_devnum = new_encode_dev(journal_inode->i_rdev);
+ path_put(&path);
+ kfree(journal_path);
+ break;
+ case Opt_noload:
+ set_opt (sbi->s_mount_opt, NOLOAD);
+ break;
+ case Opt_commit:
+ if (match_int(&args[0], &option))
+ return 0;
+ if (option < 0)
+ return 0;
+ if (option == 0)
+ option = JBD_DEFAULT_MAX_COMMIT_AGE;
+ sbi->s_commit_interval = HZ * option;
+ break;
+ case Opt_data_journal:
+ data_opt = EXT3_MOUNT_JOURNAL_DATA;
+ goto datacheck;
+ case Opt_data_ordered:
+ data_opt = EXT3_MOUNT_ORDERED_DATA;
+ goto datacheck;
+ case Opt_data_writeback:
+ data_opt = EXT3_MOUNT_WRITEBACK_DATA;
+ datacheck:
+ if (is_remount) {
+ if (test_opt(sb, DATA_FLAGS) == data_opt)
+ break;
+ ext3_msg(sb, KERN_ERR,
+ "error: cannot change "
+ "data mode on remount. The filesystem "
+ "is mounted in data=%s mode and you "
+ "try to remount it in data=%s mode.",
+ data_mode_string(test_opt(sb,
+ DATA_FLAGS)),
+ data_mode_string(data_opt));
+ return 0;
+ } else {
+ clear_opt(sbi->s_mount_opt, DATA_FLAGS);
+ sbi->s_mount_opt |= data_opt;
+ }
+ break;
+ case Opt_data_err_abort:
+ set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
+ break;
+ case Opt_data_err_ignore:
+ clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
+ break;
+#ifdef CONFIG_QUOTA
+ case Opt_usrjquota:
+ if (!set_qf_name(sb, USRQUOTA, &args[0]))
+ return 0;
+ break;
+ case Opt_grpjquota:
+ if (!set_qf_name(sb, GRPQUOTA, &args[0]))
+ return 0;
+ break;
+ case Opt_offusrjquota:
+ if (!clear_qf_name(sb, USRQUOTA))
+ return 0;
+ break;
+ case Opt_offgrpjquota:
+ if (!clear_qf_name(sb, GRPQUOTA))
+ return 0;
+ break;
+ case Opt_jqfmt_vfsold:
+ qfmt = QFMT_VFS_OLD;
+ goto set_qf_format;
+ case Opt_jqfmt_vfsv0:
+ qfmt = QFMT_VFS_V0;
+ goto set_qf_format;
+ case Opt_jqfmt_vfsv1:
+ qfmt = QFMT_VFS_V1;
+set_qf_format:
+ if (sb_any_quota_loaded(sb) &&
+ sbi->s_jquota_fmt != qfmt) {
+ ext3_msg(sb, KERN_ERR, "error: cannot change "
+ "journaled quota options when "
+ "quota turned on.");
+ return 0;
+ }
+ sbi->s_jquota_fmt = qfmt;
+ break;
+ case Opt_quota:
+ case Opt_usrquota:
+ set_opt(sbi->s_mount_opt, QUOTA);
+ set_opt(sbi->s_mount_opt, USRQUOTA);
+ break;
+ case Opt_grpquota:
+ set_opt(sbi->s_mount_opt, QUOTA);
+ set_opt(sbi->s_mount_opt, GRPQUOTA);
+ break;
+ case Opt_noquota:
+ if (sb_any_quota_loaded(sb)) {
+ ext3_msg(sb, KERN_ERR, "error: cannot change "
+ "quota options when quota turned on.");
+ return 0;
+ }
+ clear_opt(sbi->s_mount_opt, QUOTA);
+ clear_opt(sbi->s_mount_opt, USRQUOTA);
+ clear_opt(sbi->s_mount_opt, GRPQUOTA);
+ break;
+#else
+ case Opt_quota:
+ case Opt_usrquota:
+ case Opt_grpquota:
+ ext3_msg(sb, KERN_ERR,
+ "error: quota options not supported.");
+ break;
+ case Opt_usrjquota:
+ case Opt_grpjquota:
+ case Opt_offusrjquota:
+ case Opt_offgrpjquota:
+ case Opt_jqfmt_vfsold:
+ case Opt_jqfmt_vfsv0:
+ case Opt_jqfmt_vfsv1:
+ ext3_msg(sb, KERN_ERR,
+ "error: journaled quota options not "
+ "supported.");
+ break;
+ case Opt_noquota:
+ break;
+#endif
+ case Opt_abort:
+ set_opt(sbi->s_mount_opt, ABORT);
+ break;
+ case Opt_nobarrier:
+ clear_opt(sbi->s_mount_opt, BARRIER);
+ break;
+ case Opt_barrier:
+ if (args[0].from) {
+ if (match_int(&args[0], &option))
+ return 0;
+ } else
+ option = 1; /* No argument, default to 1 */
+ if (option)
+ set_opt(sbi->s_mount_opt, BARRIER);
+ else
+ clear_opt(sbi->s_mount_opt, BARRIER);
+ break;
+ case Opt_ignore:
+ break;
+ case Opt_resize:
+ if (!is_remount) {
+ ext3_msg(sb, KERN_ERR,
+ "error: resize option only available "
+ "for remount");
+ return 0;
+ }
+ if (match_int(&args[0], &option) != 0)
+ return 0;
+ *n_blocks_count = option;
+ break;
+ case Opt_nobh:
+ ext3_msg(sb, KERN_WARNING,
+ "warning: ignoring deprecated nobh option");
+ break;
+ case Opt_bh:
+ ext3_msg(sb, KERN_WARNING,
+ "warning: ignoring deprecated bh option");
+ break;
+ default:
+ ext3_msg(sb, KERN_ERR,
+ "error: unrecognized mount option \"%s\" "
+ "or missing value", p);
+ return 0;
+ }
+ }
+#ifdef CONFIG_QUOTA
+ if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
+ if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
+ clear_opt(sbi->s_mount_opt, USRQUOTA);
+ if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
+ clear_opt(sbi->s_mount_opt, GRPQUOTA);
+
+ if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
+ ext3_msg(sb, KERN_ERR, "error: old and new quota "
+ "format mixing.");
+ return 0;
+ }
+
+ if (!sbi->s_jquota_fmt) {
+ ext3_msg(sb, KERN_ERR, "error: journaled quota format "
+ "not specified.");
+ return 0;
+ }
+ }
+#endif
+ 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) {
+ ext3_msg(sb, KERN_ERR,
+ "error: revision level too high, "
+ "forcing read-only mode");
+ res = MS_RDONLY;
+ }
+ if (read_only)
+ return res;
+ if (!(sbi->s_mount_state & EXT3_VALID_FS))
+ ext3_msg(sb, KERN_WARNING,
+ "warning: mounting unchecked fs, "
+ "running e2fsck is recommended");
+ else if ((sbi->s_mount_state & EXT3_ERROR_FS))
+ ext3_msg(sb, KERN_WARNING,
+ "warning: mounting fs with errors, "
+ "running e2fsck is recommended");
+ else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
+ le16_to_cpu(es->s_mnt_count) >=
+ le16_to_cpu(es->s_max_mnt_count))
+ ext3_msg(sb, KERN_WARNING,
+ "warning: maximal mount count reached, "
+ "running e2fsck is recommended");
+ else if (le32_to_cpu(es->s_checkinterval) &&
+ (le32_to_cpu(es->s_lastcheck) +
+ le32_to_cpu(es->s_checkinterval) <= get_seconds()))
+ ext3_msg(sb, KERN_WARNING,
+ "warning: checktime reached, "
+ "running e2fsck is recommended");
+#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(~EXT3_VALID_FS);
+#endif
+ if (!le16_to_cpu(es->s_max_mnt_count))
+ es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
+ le16_add_cpu(&es->s_mnt_count, 1);
+ es->s_mtime = cpu_to_le32(get_seconds());
+ 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))
+ ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, "
+ "bpg=%lu, ipg=%lu, mo=%04lx]",
+ sb->s_blocksize,
+ sbi->s_groups_count,
+ EXT3_BLOCKS_PER_GROUP(sb),
+ EXT3_INODES_PER_GROUP(sb),
+ sbi->s_mount_opt);
+
+ if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
+ char b[BDEVNAME_SIZE];
+ ext3_msg(sb, KERN_INFO, "using external journal on %s",
+ bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
+ } else {
+ ext3_msg(sb, KERN_INFO, "using internal journal");
+ }
+ cleancache_init_fs(sb);
+ return res;
+}
+
+/* Called at mount-time, super-block is locked */
+static int ext3_check_descriptors(struct super_block *sb)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ int i;
+
+ ext3_debug ("Checking group descriptors");
+
+ for (i = 0; i < sbi->s_groups_count; i++) {
+ struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
+ ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
+ ext3_fsblk_t last_block;
+
+ if (i == sbi->s_groups_count - 1)
+ last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
+ else
+ last_block = first_block +
+ (EXT3_BLOCKS_PER_GROUP(sb) - 1);
+
+ if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
+ le32_to_cpu(gdp->bg_block_bitmap) > last_block)
+ {
+ 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) < first_block ||
+ le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
+ {
+ 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) < first_block ||
+ le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
+ last_block)
+ {
+ 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;
+ }
+ }
+
+ sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
+ sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
+ 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;
+#ifdef CONFIG_QUOTA
+ int i;
+#endif
+ if (!es->s_last_orphan) {
+ jbd_debug(4, "no orphan inodes to clean up\n");
+ return;
+ }
+
+ if (bdev_read_only(sb->s_bdev)) {
+ ext3_msg(sb, KERN_ERR, "error: write access "
+ "unavailable, skipping orphan cleanup.");
+ return;
+ }
+
+ /* Check if feature set allows readwrite operations */
+ if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) {
+ ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
+ "unknown ROCOMPAT features");
+ return;
+ }
+
+ if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
+ /* don't clear list on RO mount w/ errors */
+ if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
+ 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;
+ }
+
+ if (s_flags & MS_RDONLY) {
+ ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
+ sb->s_flags &= ~MS_RDONLY;
+ }
+#ifdef CONFIG_QUOTA
+ /* Needed for iput() to work correctly and not trash data */
+ sb->s_flags |= MS_ACTIVE;
+ /* Turn on quotas so that they are updated correctly */
+ for (i = 0; i < EXT3_MAXQUOTAS; i++) {
+ if (EXT3_SB(sb)->s_qf_names[i]) {
+ int ret = ext3_quota_on_mount(sb, i);
+ if (ret < 0)
+ ext3_msg(sb, KERN_ERR,
+ "error: cannot turn on journaled "
+ "quota: %d", ret);
+ }
+ }
+#endif
+
+ while (es->s_last_orphan) {
+ struct inode *inode;
+
+ inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
+ if (IS_ERR(inode)) {
+ es->s_last_orphan = 0;
+ break;
+ }
+
+ list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
+ dquot_initialize(inode);
+ if (inode->i_nlink) {
+ printk(KERN_DEBUG
+ "%s: truncating inode %lu to %Ld bytes\n",
+ __func__, inode->i_ino, inode->i_size);
+ jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
+ inode->i_ino, inode->i_size);
+ ext3_truncate(inode);
+ nr_truncates++;
+ } else {
+ printk(KERN_DEBUG
+ "%s: deleting unreferenced inode %lu\n",
+ __func__, inode->i_ino);
+ jbd_debug(2, "deleting unreferenced inode %lu\n",
+ inode->i_ino);
+ nr_orphans++;
+ }
+ iput(inode); /* The delete magic happens here! */
+ }
+
+#define PLURAL(x) (x), ((x)==1) ? "" : "s"
+
+ if (nr_orphans)
+ ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
+ PLURAL(nr_orphans));
+ if (nr_truncates)
+ ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
+ PLURAL(nr_truncates));
+#ifdef CONFIG_QUOTA
+ /* Turn quotas off */
+ for (i = 0; i < EXT3_MAXQUOTAS; i++) {
+ if (sb_dqopt(sb)->files[i])
+ dquot_quota_off(sb, i);
+ }
+#endif
+ sb->s_flags = s_flags; /* Restore MS_RDONLY status */
+}
+
+/*
+ * 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;
+ int meta_blocks;
+ loff_t upper_limit;
+
+ /* This is calculated to be the largest file size for a
+ * dense, file such that the total number of
+ * sectors in the file, including data and all indirect blocks,
+ * does not exceed 2^32 -1
+ * __u32 i_blocks representing the total number of
+ * 512 bytes blocks of the file
+ */
+ upper_limit = (1LL << 32) - 1;
+
+ /* total blocks in file system block size */
+ upper_limit >>= (bits - 9);
+
+
+ /* indirect blocks */
+ meta_blocks = 1;
+ /* double indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2));
+ /* tripple indirect blocks */
+ meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
+
+ upper_limit -= meta_blocks;
+ upper_limit <<= bits;
+
+ res += 1LL << (bits-2);
+ res += 1LL << (2*(bits-2));
+ res += 1LL << (3*(bits-2));
+ res <<= bits;
+ if (res > upper_limit)
+ res = upper_limit;
+
+ if (res > MAX_LFS_FILESIZE)
+ res = MAX_LFS_FILESIZE;
+
+ return res;
+}
+
+static ext3_fsblk_t descriptor_loc(struct super_block *sb,
+ ext3_fsblk_t logic_sb_block,
+ int nr)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ unsigned long bg, first_meta_bg;
+ int has_super = 0;
+
+ first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
+
+ if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
+ nr < first_meta_bg)
+ return (logic_sb_block + nr + 1);
+ bg = sbi->s_desc_per_block * nr;
+ if (ext3_bg_has_super(sb, bg))
+ has_super = 1;
+ return (has_super + ext3_group_first_block_no(sb, bg));
+}
+
+
+static int ext3_fill_super (struct super_block *sb, void *data, int silent)
+{
+ struct buffer_head * bh;
+ struct ext3_super_block *es = NULL;
+ struct ext3_sb_info *sbi;
+ ext3_fsblk_t block;
+ ext3_fsblk_t sb_block = get_sb_block(&data, sb);
+ ext3_fsblk_t logic_sb_block;
+ unsigned long offset = 0;
+ unsigned int journal_inum = 0;
+ unsigned long journal_devnum = 0;
+ unsigned long def_mount_opts;
+ struct inode *root;
+ int blocksize;
+ int hblock;
+ int db_count;
+ int i;
+ int needs_recovery;
+ int ret = -EINVAL;
+ __le32 features;
+ int err;
+
+ sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+
+ sbi->s_blockgroup_lock =
+ kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
+ if (!sbi->s_blockgroup_lock) {
+ kfree(sbi);
+ return -ENOMEM;
+ }
+ sb->s_fs_info = sbi;
+ sbi->s_sb_block = sb_block;
+
+ blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
+ if (!blocksize) {
+ ext3_msg(sb, KERN_ERR, "error: unable to set blocksize");
+ goto out_fail;
+ }
+
+ /*
+ * 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;
+ } else {
+ logic_sb_block = sb_block;
+ }
+
+ if (!(bh = sb_bread(sb, logic_sb_block))) {
+ ext3_msg(sb, KERN_ERR, "error: unable to read superblock");
+ 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 *) (bh->b_data + offset);
+ sbi->s_es = es;
+ sb->s_magic = le16_to_cpu(es->s_magic);
+ if (sb->s_magic != EXT3_SUPER_MAGIC)
+ goto cantfind_ext3;
+
+ /* Set defaults before we parse the mount options */
+ def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
+ if (def_mount_opts & EXT3_DEFM_DEBUG)
+ set_opt(sbi->s_mount_opt, DEBUG);
+ if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
+ set_opt(sbi->s_mount_opt, GRPID);
+ if (def_mount_opts & EXT3_DEFM_UID16)
+ set_opt(sbi->s_mount_opt, NO_UID32);
+#ifdef CONFIG_EXT3_FS_XATTR
+ if (def_mount_opts & EXT3_DEFM_XATTR_USER)
+ set_opt(sbi->s_mount_opt, XATTR_USER);
+#endif
+#ifdef CONFIG_EXT3_FS_POSIX_ACL
+ if (def_mount_opts & EXT3_DEFM_ACL)
+ set_opt(sbi->s_mount_opt, POSIX_ACL);
+#endif
+ if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
+ set_opt(sbi->s_mount_opt, JOURNAL_DATA);
+ else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
+ set_opt(sbi->s_mount_opt, ORDERED_DATA);
+ else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
+ set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
+
+ if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
+ set_opt(sbi->s_mount_opt, ERRORS_PANIC);
+ else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
+ set_opt(sbi->s_mount_opt, ERRORS_CONT);
+ else
+ set_opt(sbi->s_mount_opt, ERRORS_RO);
+
+ sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
+ sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
+
+ /* enable barriers by default */
+ set_opt(sbi->s_mount_opt, BARRIER);
+ set_opt(sbi->s_mount_opt, RESERVATION);
+
+ if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
+ NULL, 0))
+ goto failed_mount;
+
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+
+ 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)))
+ ext3_msg(sb, KERN_WARNING,
+ "warning: feature flags set on rev 0 fs, "
+ "running e2fsck is recommended");
+ /*
+ * 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.
+ */
+ features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
+ if (features) {
+ ext3_msg(sb, KERN_ERR,
+ "error: couldn't mount because of unsupported "
+ "optional features (%x)", le32_to_cpu(features));
+ goto failed_mount;
+ }
+ features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
+ if (!(sb->s_flags & MS_RDONLY) && features) {
+ ext3_msg(sb, KERN_ERR,
+ "error: couldn't mount RDWR because of unsupported "
+ "optional features (%x)", le32_to_cpu(features));
+ goto failed_mount;
+ }
+ blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
+
+ if (blocksize < EXT3_MIN_BLOCK_SIZE ||
+ blocksize > EXT3_MAX_BLOCK_SIZE) {
+ ext3_msg(sb, KERN_ERR,
+ "error: couldn't mount because of unsupported "
+ "filesystem blocksize %d", blocksize);
+ goto failed_mount;
+ }
+
+ hblock = bdev_logical_block_size(sb->s_bdev);
+ if (sb->s_blocksize != blocksize) {
+ /*
+ * Make sure the blocksize for the filesystem is larger
+ * than the hardware sectorsize for the machine.
+ */
+ if (blocksize < hblock) {
+ ext3_msg(sb, KERN_ERR,
+ "error: fsblocksize %d too small for "
+ "hardware sectorsize %d", blocksize, hblock);
+ goto failed_mount;
+ }
+
+ brelse (bh);
+ if (!sb_set_blocksize(sb, blocksize)) {
+ ext3_msg(sb, KERN_ERR,
+ "error: bad blocksize %d", blocksize);
+ goto out_fail;
+ }
+ logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
+ offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
+ bh = sb_bread(sb, logic_sb_block);
+ if (!bh) {
+ ext3_msg(sb, KERN_ERR,
+ "error: can't read superblock on 2nd try");
+ goto failed_mount;
+ }
+ es = (struct ext3_super_block *)(bh->b_data + offset);
+ sbi->s_es = es;
+ if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
+ ext3_msg(sb, KERN_ERR,
+ "error: magic mismatch");
+ goto failed_mount;
+ }
+ }
+
+ sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
+
+ 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) ||
+ (!is_power_of_2(sbi->s_inode_size)) ||
+ (sbi->s_inode_size > blocksize)) {
+ ext3_msg(sb, KERN_ERR,
+ "error: unsupported inode size: %d",
+ 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) {
+ ext3_msg(sb, KERN_ERR,
+ "error: fragsize %lu != blocksize %u (unsupported)",
+ 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);
+ if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
+ goto cantfind_ext3;
+ sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
+ if (sbi->s_inodes_per_block == 0)
+ goto cantfind_ext3;
+ 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;
+ sbi->s_mount_state = le16_to_cpu(es->s_state);
+ sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
+ sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
+ for (i=0; i < 4; i++)
+ sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
+ sbi->s_def_hash_version = es->s_def_hash_version;
+ i = le32_to_cpu(es->s_flags);
+ if (i & EXT2_FLAGS_UNSIGNED_HASH)
+ sbi->s_hash_unsigned = 3;
+ else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
+#ifdef __CHAR_UNSIGNED__
+ es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
+ sbi->s_hash_unsigned = 3;
+#else
+ es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
+#endif
+ }
+
+ if (sbi->s_blocks_per_group > blocksize * 8) {
+ ext3_msg(sb, KERN_ERR,
+ "#blocks per group too big: %lu",
+ sbi->s_blocks_per_group);
+ goto failed_mount;
+ }
+ if (sbi->s_frags_per_group > blocksize * 8) {
+ ext3_msg(sb, KERN_ERR,
+ "error: #fragments per group too big: %lu",
+ sbi->s_frags_per_group);
+ goto failed_mount;
+ }
+ if (sbi->s_inodes_per_group > blocksize * 8) {
+ ext3_msg(sb, KERN_ERR,
+ "error: #inodes per group too big: %lu",
+ sbi->s_inodes_per_group);
+ goto failed_mount;
+ }
+
+ err = generic_check_addressable(sb->s_blocksize_bits,
+ le32_to_cpu(es->s_blocks_count));
+ if (err) {
+ ext3_msg(sb, KERN_ERR,
+ "error: filesystem is too large to mount safely");
+ if (sizeof(sector_t) < 8)
+ ext3_msg(sb, KERN_ERR,
+ "error: CONFIG_LBDAF not enabled");
+ ret = err;
+ goto failed_mount;
+ }
+
+ if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
+ goto cantfind_ext3;
+ sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
+ le32_to_cpu(es->s_first_data_block) - 1)
+ / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
+ db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb));
+ sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
+ GFP_KERNEL);
+ if (sbi->s_group_desc == NULL) {
+ ext3_msg(sb, KERN_ERR,
+ "error: not enough memory");
+ ret = -ENOMEM;
+ goto failed_mount;
+ }
+
+ bgl_lock_init(sbi->s_blockgroup_lock);
+
+ for (i = 0; i < db_count; i++) {
+ block = descriptor_loc(sb, logic_sb_block, i);
+ sbi->s_group_desc[i] = sb_bread(sb, block);
+ if (!sbi->s_group_desc[i]) {
+ ext3_msg(sb, KERN_ERR,
+ "error: can't read group descriptor %d", i);
+ db_count = i;
+ goto failed_mount2;
+ }
+ }
+ if (!ext3_check_descriptors (sb)) {
+ ext3_msg(sb, KERN_ERR,
+ "error: group descriptors corrupted");
+ goto failed_mount2;
+ }
+ sbi->s_gdb_count = db_count;
+ get_random_bytes(&sbi->s_next_generation, sizeof(u32));
+ spin_lock_init(&sbi->s_next_gen_lock);
+
+ /* per fileystem reservation list head & lock */
+ spin_lock_init(&sbi->s_rsv_window_lock);
+ sbi->s_rsv_window_root = RB_ROOT;
+ /* Add a single, static dummy reservation to the start of the
+ * reservation window list --- it gives us a placeholder for
+ * append-at-start-of-list which makes the allocation logic
+ * _much_ simpler. */
+ sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
+ sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
+ sbi->s_rsv_window_head.rsv_alloc_hit = 0;
+ sbi->s_rsv_window_head.rsv_goal_size = 0;
+ ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
+
+ /*
+ * set up enough so that it can read an inode
+ */
+ sb->s_op = &ext3_sops;
+ sb->s_export_op = &ext3_export_ops;
+ sb->s_xattr = ext3_xattr_handlers;
+#ifdef CONFIG_QUOTA
+ sb->s_qcop = &ext3_qctl_operations;
+ sb->dq_op = &ext3_quota_operations;
+ sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
+#endif
+ memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
+ INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
+ mutex_init(&sbi->s_orphan_lock);
+ mutex_init(&sbi->s_resize_lock);
+
+ sb->s_root = NULL;
+
+ 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, journal_devnum))
+ goto failed_mount2;
+ } else if (journal_inum) {
+ if (ext3_create_journal(sb, es, journal_inum))
+ goto failed_mount2;
+ } else {
+ if (!silent)
+ ext3_msg(sb, KERN_ERR,
+ "error: no journal found. "
+ "mounting ext3 over ext2?");
+ goto failed_mount2;
+ }
+ err = percpu_counter_init(&sbi->s_freeblocks_counter,
+ ext3_count_free_blocks(sb), GFP_KERNEL);
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_freeinodes_counter,
+ ext3_count_free_inodes(sb), GFP_KERNEL);
+ }
+ if (!err) {
+ err = percpu_counter_init(&sbi->s_dirs_counter,
+ ext3_count_dirs(sb), GFP_KERNEL);
+ }
+ if (err) {
+ ext3_msg(sb, KERN_ERR, "error: insufficient memory");
+ ret = err;
+ goto failed_mount3;
+ }
+
+ /* 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, DEFAULT_DATA_MODE);
+ 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)) {
+ ext3_msg(sb, KERN_ERR,
+ "error: journal does not support "
+ "requested data journaling mode");
+ 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.
+ */
+
+ root = ext3_iget(sb, EXT3_ROOT_INO);
+ if (IS_ERR(root)) {
+ ext3_msg(sb, KERN_ERR, "error: get root inode failed");
+ ret = PTR_ERR(root);
+ goto failed_mount3;
+ }
+ if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
+ iput(root);
+ ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
+ goto failed_mount3;
+ }
+ sb->s_root = d_make_root(root);
+ if (!sb->s_root) {
+ ext3_msg(sb, KERN_ERR, "error: get root dentry failed");
+ ret = -ENOMEM;
+ goto failed_mount3;
+ }
+
+ if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY))
+ sb->s_flags |= MS_RDONLY;
+
+ EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
+ ext3_orphan_cleanup(sb, es);
+ EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
+ if (needs_recovery) {
+ ext3_mark_recovery_complete(sb, es);
+ ext3_msg(sb, KERN_INFO, "recovery complete");
+ }
+ ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode",
+ test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
+ test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
+ "writeback");
+
+ return 0;
+
+cantfind_ext3:
+ if (!silent)
+ ext3_msg(sb, KERN_INFO,
+ "error: can't find ext3 filesystem on dev %s.",
+ sb->s_id);
+ goto failed_mount;
+
+failed_mount3:
+ percpu_counter_destroy(&sbi->s_freeblocks_counter);
+ percpu_counter_destroy(&sbi->s_freeinodes_counter);
+ percpu_counter_destroy(&sbi->s_dirs_counter);
+ 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:
+#ifdef CONFIG_QUOTA
+ for (i = 0; i < EXT3_MAXQUOTAS; i++)
+ kfree(sbi->s_qf_names[i]);
+#endif
+ ext3_blkdev_remove(sbi);
+ brelse(bh);
+out_fail:
+ sb->s_fs_info = NULL;
+ kfree(sbi->s_blockgroup_lock);
+ kfree(sbi);
+ return ret;
+}
+
+/*
+ * Setup any per-fs journal parameters now. We'll do this both on
+ * initial mount, once the journal has been initialised but before we've
+ * done any recovery; and again on any subsequent remount.
+ */
+static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
+{
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+
+ if (sbi->s_commit_interval)
+ journal->j_commit_interval = sbi->s_commit_interval;
+ /* We could also set up an ext3-specific default for the commit
+ * interval here, but for now we'll just fall back to the jbd
+ * default. */
+
+ spin_lock(&journal->j_state_lock);
+ if (test_opt(sb, BARRIER))
+ journal->j_flags |= JFS_BARRIER;
+ else
+ journal->j_flags &= ~JFS_BARRIER;
+ if (test_opt(sb, DATA_ERR_ABORT))
+ journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
+ else
+ journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
+ spin_unlock(&journal->j_state_lock);
+}
+
+static journal_t *ext3_get_journal(struct super_block *sb,
+ unsigned 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 = ext3_iget(sb, journal_inum);
+ if (IS_ERR(journal_inode)) {
+ ext3_msg(sb, KERN_ERR, "error: no journal found");
+ return NULL;
+ }
+ if (!journal_inode->i_nlink) {
+ make_bad_inode(journal_inode);
+ iput(journal_inode);
+ ext3_msg(sb, KERN_ERR, "error: journal inode is deleted");
+ return NULL;
+ }
+
+ jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
+ journal_inode, journal_inode->i_size);
+ if (!S_ISREG(journal_inode->i_mode)) {
+ ext3_msg(sb, KERN_ERR, "error: invalid journal inode");
+ iput(journal_inode);
+ return NULL;
+ }
+
+ journal = journal_init_inode(journal_inode);
+ if (!journal) {
+ ext3_msg(sb, KERN_ERR, "error: could not load journal inode");
+ iput(journal_inode);
+ return NULL;
+ }
+ journal->j_private = sb;
+ ext3_init_journal_params(sb, journal);
+ return journal;
+}
+
+static journal_t *ext3_get_dev_journal(struct super_block *sb,
+ dev_t j_dev)
+{
+ struct buffer_head * bh;
+ journal_t *journal;
+ ext3_fsblk_t start;
+ ext3_fsblk_t len;
+ int hblock, blocksize;
+ ext3_fsblk_t sb_block;
+ unsigned long offset;
+ struct ext3_super_block * es;
+ struct block_device *bdev;
+
+ bdev = ext3_blkdev_get(j_dev, sb);
+ if (bdev == NULL)
+ return NULL;
+
+ blocksize = sb->s_blocksize;
+ hblock = bdev_logical_block_size(bdev);
+ if (blocksize < hblock) {
+ ext3_msg(sb, KERN_ERR,
+ "error: blocksize too small for journal device");
+ goto out_bdev;
+ }
+
+ sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
+ offset = EXT3_MIN_BLOCK_SIZE % blocksize;
+ set_blocksize(bdev, blocksize);
+ if (!(bh = __bread(bdev, sb_block, blocksize))) {
+ ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of "
+ "external journal");
+ goto out_bdev;
+ }
+
+ es = (struct ext3_super_block *) (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)) {
+ ext3_msg(sb, KERN_ERR, "error: external journal has "
+ "bad superblock");
+ brelse(bh);
+ goto out_bdev;
+ }
+
+ if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
+ ext3_msg(sb, KERN_ERR, "error: journal UUID does not match");
+ 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(bdev, sb->s_bdev,
+ start, len, blocksize);
+ if (!journal) {
+ ext3_msg(sb, KERN_ERR,
+ "error: failed to create device journal");
+ goto out_bdev;
+ }
+ journal->j_private = sb;
+ if (!bh_uptodate_or_lock(journal->j_sb_buffer)) {
+ if (bh_submit_read(journal->j_sb_buffer)) {
+ ext3_msg(sb, KERN_ERR, "I/O error on journal device");
+ goto out_journal;
+ }
+ }
+ if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
+ ext3_msg(sb, KERN_ERR,
+ "error: external journal has more than one "
+ "user (unsupported) - %d",
+ be32_to_cpu(journal->j_superblock->s_nr_users));
+ goto out_journal;
+ }
+ EXT3_SB(sb)->journal_bdev = bdev;
+ ext3_init_journal_params(sb, journal);
+ 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,
+ unsigned long journal_devnum)
+{
+ journal_t *journal;
+ unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
+ dev_t journal_dev;
+ int err = 0;
+ int really_read_only;
+
+ if (journal_devnum &&
+ journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+ ext3_msg(sb, KERN_INFO, "external journal device major/minor "
+ "numbers have changed");
+ journal_dev = new_decode_dev(journal_devnum);
+ } else
+ journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
+
+ really_read_only = bdev_read_only(sb->s_bdev);
+
+ /*
+ * 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) {
+ ext3_msg(sb, KERN_INFO,
+ "recovery required on readonly filesystem");
+ if (really_read_only) {
+ ext3_msg(sb, KERN_ERR, "error: write access "
+ "unavailable, cannot proceed");
+ return -EROFS;
+ }
+ ext3_msg(sb, KERN_INFO,
+ "write access will be enabled during recovery");
+ }
+ }
+
+ if (journal_inum && journal_dev) {
+ ext3_msg(sb, KERN_ERR, "error: filesystem has both journal "
+ "and inode journals");
+ 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 (!(journal->j_flags & JFS_BARRIER))
+ printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
+
+ if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
+ err = journal_update_format(journal);
+ if (err) {
+ ext3_msg(sb, KERN_ERR, "error updating journal");
+ journal_destroy(journal);
+ return err;
+ }
+ }
+
+ if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
+ err = journal_wipe(journal, !really_read_only);
+ if (!err)
+ err = journal_load(journal);
+
+ if (err) {
+ ext3_msg(sb, KERN_ERR, "error loading journal");
+ journal_destroy(journal);
+ return err;
+ }
+
+ EXT3_SB(sb)->s_journal = journal;
+ ext3_clear_journal_err(sb, es);
+
+ if (!really_read_only && journal_devnum &&
+ journal_devnum != le32_to_cpu(es->s_journal_dev)) {
+ es->s_journal_dev = cpu_to_le32(journal_devnum);
+
+ /* Make sure we flush the recovery flag to disk. */
+ ext3_commit_super(sb, es, 1);
+ }
+
+ return 0;
+}
+
+static int ext3_create_journal(struct super_block *sb,
+ struct ext3_super_block *es,
+ unsigned int journal_inum)
+{
+ journal_t *journal;
+ int err;
+
+ if (sb->s_flags & MS_RDONLY) {
+ ext3_msg(sb, KERN_ERR,
+ "error: readonly filesystem when trying to "
+ "create journal");
+ return -EROFS;
+ }
+
+ journal = ext3_get_journal(sb, journal_inum);
+ if (!journal)
+ return -EINVAL;
+
+ ext3_msg(sb, KERN_INFO, "creating new journal on inode %u",
+ journal_inum);
+
+ err = journal_create(journal);
+ if (err) {
+ ext3_msg(sb, KERN_ERR, "error creating journal");
+ 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);
+
+ /* Make sure we flush the recovery flag to disk. */
+ ext3_commit_super(sb, es, 1);
+
+ return 0;
+}
+
+static int ext3_commit_super(struct super_block *sb,
+ struct ext3_super_block *es,
+ int sync)
+{
+ struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
+ int error = 0;
+
+ if (!sbh)
+ return error;
+
+ if (buffer_write_io_error(sbh)) {
+ /*
+ * Oh, dear. A previous attempt to write the
+ * superblock failed. This could happen because the
+ * USB device was yanked out. Or it could happen to
+ * be a transient write error and maybe the block will
+ * be remapped. Nothing we can do but to retry the
+ * write and hope for the best.
+ */
+ ext3_msg(sb, KERN_ERR, "previous I/O error to "
+ "superblock detected");
+ clear_buffer_write_io_error(sbh);
+ set_buffer_uptodate(sbh);
+ }
+ /*
+ * If the file system is mounted read-only, don't update the
+ * superblock write time. This avoids updating the superblock
+ * write time when we are mounting the root file system
+ * read/only but we need to replay the journal; at that point,
+ * for people who are east of GMT and who make their clock
+ * tick in localtime for Windows bug-for-bug compatibility,
+ * the clock is set in the future, and this will cause e2fsck
+ * to complain and force a full file system check.
+ */
+ if (!(sb->s_flags & MS_RDONLY))
+ es->s_wtime = cpu_to_le32(get_seconds());
+ es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
+ es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
+ BUFFER_TRACE(sbh, "marking dirty");
+ mark_buffer_dirty(sbh);
+ if (sync) {
+ error = sync_dirty_buffer(sbh);
+ if (buffer_write_io_error(sbh)) {
+ ext3_msg(sb, KERN_ERR, "I/O error while writing "
+ "superblock");
+ clear_buffer_write_io_error(sbh);
+ set_buffer_uptodate(sbh);
+ }
+ }
+ return error;
+}
+
+
+/*
+ * 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_t *journal = EXT3_SB(sb)->s_journal;
+
+ journal_lock_updates(journal);
+ if (journal_flush(journal) < 0)
+ goto out;
+
+ if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
+ sb->s_flags & MS_RDONLY) {
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ ext3_commit_super(sb, es, 1);
+ }
+
+out:
+ journal_unlock_updates(journal);
+}
+
+/*
+ * 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, __func__, "Filesystem error recorded "
+ "from previous mount: %s", errstr);
+ ext3_warning(sb, __func__, "Marking fs in need of "
+ "filesystem check.");
+
+ EXT3_SB(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;
+ ret = ext3_journal_force_commit(journal);
+ return ret;
+}
+
+static int ext3_sync_fs(struct super_block *sb, int wait)
+{
+ tid_t target;
+
+ trace_ext3_sync_fs(sb, wait);
+ /*
+ * Writeback quota in non-journalled quota case - journalled quota has
+ * no dirty dquots
+ */
+ dquot_writeback_dquots(sb, -1);
+ if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
+ if (wait)
+ log_wait_commit(EXT3_SB(sb)->s_journal, target);
+ }
+ return 0;
+}
+
+/*
+ * 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.
+ */
+static int ext3_freeze(struct super_block *sb)
+{
+ int error = 0;
+ journal_t *journal;
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ journal = EXT3_SB(sb)->s_journal;
+
+ /* Now we set up the journal barrier. */
+ journal_lock_updates(journal);
+
+ /*
+ * We don't want to clear needs_recovery flag when we failed
+ * to flush the journal.
+ */
+ error = journal_flush(journal);
+ if (error < 0)
+ goto out;
+
+ /* Journal blocked and flushed, clear needs_recovery flag. */
+ EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
+ error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
+ if (error)
+ goto out;
+ }
+ return 0;
+
+out:
+ journal_unlock_updates(journal);
+ return error;
+}
+
+/*
+ * 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.
+ */
+static int ext3_unfreeze(struct super_block *sb)
+{
+ if (!(sb->s_flags & MS_RDONLY)) {
+ /* 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);
+ journal_unlock_updates(EXT3_SB(sb)->s_journal);
+ }
+ return 0;
+}
+
+static int ext3_remount (struct super_block * sb, int * flags, char * data)
+{
+ struct ext3_super_block * es;
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ ext3_fsblk_t n_blocks_count = 0;
+ unsigned long old_sb_flags;
+ struct ext3_mount_options old_opts;
+ int enable_quota = 0;
+ int err;
+#ifdef CONFIG_QUOTA
+ int i;
+#endif
+
+ sync_filesystem(sb);
+
+ /* Store the original options */
+ old_sb_flags = sb->s_flags;
+ old_opts.s_mount_opt = sbi->s_mount_opt;
+ old_opts.s_resuid = sbi->s_resuid;
+ old_opts.s_resgid = sbi->s_resgid;
+ old_opts.s_commit_interval = sbi->s_commit_interval;
+#ifdef CONFIG_QUOTA
+ old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
+ for (i = 0; i < EXT3_MAXQUOTAS; i++)
+ if (sbi->s_qf_names[i]) {
+ old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
+ GFP_KERNEL);
+ if (!old_opts.s_qf_names[i]) {
+ int j;
+
+ for (j = 0; j < i; j++)
+ kfree(old_opts.s_qf_names[j]);
+ return -ENOMEM;
+ }
+ } else
+ old_opts.s_qf_names[i] = NULL;
+#endif
+
+ /*
+ * Allow the "check" option to be passed as a remount option.
+ */
+ if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
+ if (test_opt(sb, ABORT))
+ ext3_abort(sb, __func__, "Abort forced by user");
+
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+
+ es = sbi->s_es;
+
+ ext3_init_journal_params(sb, sbi->s_journal);
+
+ if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
+ n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
+ if (test_opt(sb, ABORT)) {
+ err = -EROFS;
+ goto restore_opts;
+ }
+
+ if (*flags & MS_RDONLY) {
+ err = dquot_suspend(sb, -1);
+ if (err < 0)
+ goto restore_opts;
+
+ /*
+ * 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 {
+ __le32 ret;
+ if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
+ ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
+ ext3_msg(sb, KERN_WARNING,
+ "warning: couldn't remount RDWR "
+ "because of unsupported optional "
+ "features (%x)", le32_to_cpu(ret));
+ err = -EROFS;
+ goto restore_opts;
+ }
+
+ /*
+ * If we have an unprocessed orphan list hanging
+ * around from a previously readonly bdev mount,
+ * require a full umount & mount for now.
+ */
+ if (es->s_last_orphan) {
+ ext3_msg(sb, KERN_WARNING, "warning: couldn't "
+ "remount RDWR because of unprocessed "
+ "orphan inode list. Please "
+ "umount & mount instead.");
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
+ /*
+ * 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 ((err = ext3_group_extend(sb, es, n_blocks_count)))
+ goto restore_opts;
+ if (!ext3_setup_super (sb, es, 0))
+ sb->s_flags &= ~MS_RDONLY;
+ enable_quota = 1;
+ }
+ }
+#ifdef CONFIG_QUOTA
+ /* Release old quota file names */
+ for (i = 0; i < EXT3_MAXQUOTAS; i++)
+ kfree(old_opts.s_qf_names[i]);
+#endif
+ if (enable_quota)
+ dquot_resume(sb, -1);
+ return 0;
+restore_opts:
+ sb->s_flags = old_sb_flags;
+ sbi->s_mount_opt = old_opts.s_mount_opt;
+ sbi->s_resuid = old_opts.s_resuid;
+ sbi->s_resgid = old_opts.s_resgid;
+ sbi->s_commit_interval = old_opts.s_commit_interval;
+#ifdef CONFIG_QUOTA
+ sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
+ for (i = 0; i < EXT3_MAXQUOTAS; i++) {
+ kfree(sbi->s_qf_names[i]);
+ sbi->s_qf_names[i] = old_opts.s_qf_names[i];
+ }
+#endif
+ return err;
+}
+
+static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct ext3_sb_info *sbi = EXT3_SB(sb);
+ struct ext3_super_block *es = sbi->s_es;
+ u64 fsid;
+
+ if (test_opt(sb, MINIX_DF)) {
+ sbi->s_overhead_last = 0;
+ } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
+ unsigned long ngroups = sbi->s_groups_count, i;
+ ext3_fsblk_t overhead = 0;
+ smp_rmb();
+
+ /*
+ * Compute the overhead (FS structures). This is constant
+ * for a given filesystem unless the number of block groups
+ * changes so we cache the previous value until it does.
+ */
+
+ /*
+ * 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 < ngroups; i++) {
+ overhead += ext3_bg_has_super(sb, i) +
+ ext3_bg_num_gdb(sb, i);
+ cond_resched();
+ }
+
+ /*
+ * Every block group has an inode bitmap, a block
+ * bitmap, and an inode table.
+ */
+ overhead += ngroups * (2 + sbi->s_itb_per_group);
+
+ /* Add the internal journal blocks as well */
+ if (sbi->s_journal && !sbi->journal_bdev)
+ overhead += sbi->s_journal->j_maxlen;
+
+ sbi->s_overhead_last = overhead;
+ smp_wmb();
+ sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
+ }
+
+ buf->f_type = EXT3_SUPER_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
+ buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
+ 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 = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
+ buf->f_namelen = EXT3_NAME_LEN;
+ fsid = le64_to_cpup((void *)es->s_uuid) ^
+ le64_to_cpup((void *)es->s_uuid + sizeof(u64));
+ buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
+ buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
+ return 0;
+}
+
+/* Helper function for writing quotas on sync - we need to start transaction before quota file
+ * is locked for write. Otherwise the are possible deadlocks:
+ * Process 1 Process 2
+ * ext3_create() quota_sync()
+ * journal_start() write_dquot()
+ * dquot_initialize() down(dqio_mutex)
+ * down(dqio_mutex) journal_start()
+ *
+ */
+
+#ifdef CONFIG_QUOTA
+
+static inline struct inode *dquot_to_inode(struct dquot *dquot)
+{
+ return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
+}
+
+static int ext3_write_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+ struct inode *inode;
+
+ inode = dquot_to_inode(dquot);
+ handle = ext3_journal_start(inode,
+ EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_commit(dquot);
+ err = ext3_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext3_acquire_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+
+ handle = ext3_journal_start(dquot_to_inode(dquot),
+ EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_acquire(dquot);
+ err = ext3_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext3_release_dquot(struct dquot *dquot)
+{
+ int ret, err;
+ handle_t *handle;
+
+ handle = ext3_journal_start(dquot_to_inode(dquot),
+ EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
+ if (IS_ERR(handle)) {
+ /* Release dquot anyway to avoid endless cycle in dqput() */
+ dquot_release(dquot);
+ return PTR_ERR(handle);
+ }
+ ret = dquot_release(dquot);
+ err = ext3_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+static int ext3_mark_dquot_dirty(struct dquot *dquot)
+{
+ /* Are we journaling quotas? */
+ if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
+ EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
+ dquot_mark_dquot_dirty(dquot);
+ return ext3_write_dquot(dquot);
+ } else {
+ return dquot_mark_dquot_dirty(dquot);
+ }
+}
+
+static int ext3_write_info(struct super_block *sb, int type)
+{
+ int ret, err;
+ handle_t *handle;
+
+ /* Data block + inode block */
+ handle = ext3_journal_start(d_inode(sb->s_root), 2);
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ ret = dquot_commit_info(sb, type);
+ err = ext3_journal_stop(handle);
+ if (!ret)
+ ret = err;
+ return ret;
+}
+
+/*
+ * Turn on quotas during mount time - we need to find
+ * the quota file and such...
+ */
+static int ext3_quota_on_mount(struct super_block *sb, int type)
+{
+ return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
+ EXT3_SB(sb)->s_jquota_fmt, type);
+}
+
+/*
+ * Standard function to be called on quota_on
+ */
+static int ext3_quota_on(struct super_block *sb, int type, int format_id,
+ struct path *path)
+{
+ int err;
+
+ if (!test_opt(sb, QUOTA))
+ return -EINVAL;
+
+ /* Quotafile not on the same filesystem? */
+ if (path->dentry->d_sb != sb)
+ return -EXDEV;
+ /* Journaling quota? */
+ if (EXT3_SB(sb)->s_qf_names[type]) {
+ /* Quotafile not of fs root? */
+ if (path->dentry->d_parent != sb->s_root)
+ ext3_msg(sb, KERN_WARNING,
+ "warning: Quota file not on filesystem root. "
+ "Journaled quota will not work.");
+ }
+
+ /*
+ * When we journal data on quota file, we have to flush journal to see
+ * all updates to the file when we bypass pagecache...
+ */
+ if (ext3_should_journal_data(d_inode(path->dentry))) {
+ /*
+ * We don't need to lock updates but journal_flush() could
+ * otherwise be livelocked...
+ */
+ journal_lock_updates(EXT3_SB(sb)->s_journal);
+ err = journal_flush(EXT3_SB(sb)->s_journal);
+ journal_unlock_updates(EXT3_SB(sb)->s_journal);
+ if (err)
+ return err;
+ }
+
+ return dquot_quota_on(sb, type, format_id, path);
+}
+
+/* Read data from quotafile - avoid pagecache and such because we cannot afford
+ * acquiring the locks... As quota files are never truncated and quota code
+ * itself serializes the operations (and no one else should touch the files)
+ * we don't have to be afraid of races */
+static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
+ size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ int tocopy;
+ size_t toread;
+ struct buffer_head *bh;
+ loff_t i_size = i_size_read(inode);
+
+ if (off > i_size)
+ return 0;
+ if (off+len > i_size)
+ len = i_size-off;
+ toread = len;
+ while (toread > 0) {
+ tocopy = sb->s_blocksize - offset < toread ?
+ sb->s_blocksize - offset : toread;
+ bh = ext3_bread(NULL, inode, blk, 0, &err);
+ if (err)
+ return err;
+ if (!bh) /* A hole? */
+ memset(data, 0, tocopy);
+ else
+ memcpy(data, bh->b_data+offset, tocopy);
+ brelse(bh);
+ offset = 0;
+ toread -= tocopy;
+ data += tocopy;
+ blk++;
+ }
+ return len;
+}
+
+/* Write to quotafile (we know the transaction is already started and has
+ * enough credits) */
+static ssize_t ext3_quota_write(struct super_block *sb, int type,
+ const char *data, size_t len, loff_t off)
+{
+ struct inode *inode = sb_dqopt(sb)->files[type];
+ sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
+ int err = 0;
+ int offset = off & (sb->s_blocksize - 1);
+ int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
+ struct buffer_head *bh;
+ handle_t *handle = journal_current_handle();
+
+ if (!handle) {
+ ext3_msg(sb, KERN_WARNING,
+ "warning: quota write (off=%llu, len=%llu)"
+ " cancelled because transaction is not started.",
+ (unsigned long long)off, (unsigned long long)len);
+ return -EIO;
+ }
+
+ /*
+ * Since we account only one data block in transaction credits,
+ * then it is impossible to cross a block boundary.
+ */
+ if (sb->s_blocksize - offset < len) {
+ ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
+ " cancelled because not block aligned",
+ (unsigned long long)off, (unsigned long long)len);
+ return -EIO;
+ }
+ bh = ext3_bread(handle, inode, blk, 1, &err);
+ if (!bh)
+ goto out;
+ if (journal_quota) {
+ err = ext3_journal_get_write_access(handle, bh);
+ if (err) {
+ brelse(bh);
+ goto out;
+ }
+ }
+ lock_buffer(bh);
+ memcpy(bh->b_data+offset, data, len);
+ flush_dcache_page(bh->b_page);
+ unlock_buffer(bh);
+ if (journal_quota)
+ err = ext3_journal_dirty_metadata(handle, bh);
+ else {
+ /* Always do at least ordered writes for quotas */
+ err = ext3_journal_dirty_data(handle, bh);
+ mark_buffer_dirty(bh);
+ }
+ brelse(bh);
+out:
+ if (err)
+ return err;
+ if (inode->i_size < off + len) {
+ i_size_write(inode, off + len);
+ EXT3_I(inode)->i_disksize = inode->i_size;
+ }
+ inode->i_version++;
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ ext3_mark_inode_dirty(handle, inode);
+ return len;
+}
+
+#endif
+
+static struct dentry *ext3_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
+}
+
+static struct file_system_type ext3_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ext3",
+ .mount = ext3_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("ext3");
+
+static int __init init_ext3_fs(void)
+{
+ int err = init_ext3_xattr();
+ if (err)
+ return err;
+ err = init_inodecache();
+ if (err)
+ goto out1;
+ err = register_filesystem(&ext3_fs_type);
+ if (err)
+ goto out;
+ return 0;
+out:
+ destroy_inodecache();
+out1:
+ exit_ext3_xattr();
+ return err;
+}
+
+static void __exit exit_ext3_fs(void)
+{
+ unregister_filesystem(&ext3_fs_type);
+ destroy_inodecache();
+ exit_ext3_xattr();
+}
+
+MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
+MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
+MODULE_LICENSE("GPL");
+module_init(init_ext3_fs)
+module_exit(exit_ext3_fs)
Code Review / kvmfornfv.git / blobdiff