+++ /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