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super.c
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/*
* linux/fs/ext3/super.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card ([email protected])
* 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 ([email protected]), 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_info = dquot_get_dqinfo,
.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