blob: cebbab30af5e6fbe4af5dbc1f7f559fbe505be4b [file] [log] [blame]
/*
* linux/fs/ext4/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/string.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/jbd2.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/log2.h>
#include <linux/crc16.h>
#include <linux/cleancache.h>
#include <asm/uaccess.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include "ext4.h"
#include "ext4_extents.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
#include "mballoc.h"
#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>
static struct proc_dir_entry *ext4_proc_root;
static struct kset *ext4_kset;
static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
static struct ext4_features *ext4_feat;
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
unsigned long journal_devnum);
static int ext4_commit_super(struct super_block *sb, int sync);
static void ext4_mark_recovery_complete(struct super_block *sb,
struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
struct ext4_super_block *es);
static int ext4_sync_fs(struct super_block *sb, int wait);
static const char *ext4_decode_error(struct super_block *sb, int errno,
char nbuf[16]);
static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
static int ext4_unfreeze(struct super_block *sb);
static void ext4_write_super(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data);
static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
static int ext4_feature_set_ok(struct super_block *sb, int readonly);
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
static void ext4_clear_request_list(void);
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext2_fs_type = {
.owner = THIS_MODULE,
.name = "ext2",
.mount = ext4_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext3_fs_type = {
.owner = THIS_MODULE,
.name = "ext3",
.mount = ext4_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
#else
#define IS_EXT3_SB(sb) (0)
#endif
void *ext4_kvmalloc(size_t size, gfp_t flags)
{
void *ret;
ret = kmalloc(size, flags);
if (!ret)
ret = __vmalloc(size, flags, PAGE_KERNEL);
return ret;
}
void *ext4_kvzalloc(size_t size, gfp_t flags)
{
void *ret;
ret = kzalloc(size, flags);
if (!ret)
ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
return ret;
}
void ext4_kvfree(void *ptr)
{
if (is_vmalloc_addr(ptr))
vfree(ptr);
else
kfree(ptr);
}
ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le32_to_cpu(bg->bg_block_bitmap_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
}
ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le32_to_cpu(bg->bg_inode_bitmap_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
}
ext4_fsblk_t ext4_inode_table(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le32_to_cpu(bg->bg_inode_table_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
}
__u32 ext4_free_group_clusters(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le16_to_cpu(bg->bg_free_blocks_count_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
}
__u32 ext4_free_inodes_count(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le16_to_cpu(bg->bg_free_inodes_count_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
}
__u32 ext4_used_dirs_count(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le16_to_cpu(bg->bg_used_dirs_count_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
}
__u32 ext4_itable_unused_count(struct super_block *sb,
struct ext4_group_desc *bg)
{
return le16_to_cpu(bg->bg_itable_unused_lo) |
(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
(__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
}
void ext4_block_bitmap_set(struct super_block *sb,
struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
}
void ext4_inode_bitmap_set(struct super_block *sb,
struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
}
void ext4_inode_table_set(struct super_block *sb,
struct ext4_group_desc *bg, ext4_fsblk_t blk)
{
bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
}
void ext4_free_group_clusters_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count)
{
bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}
void ext4_free_inodes_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count)
{
bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
}
void ext4_used_dirs_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count)
{
bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
}
void ext4_itable_unused_set(struct super_block *sb,
struct ext4_group_desc *bg, __u32 count)
{
bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
}
/* Just increment the non-pointer handle value */
static handle_t *ext4_get_nojournal(void)
{
handle_t *handle = current->journal_info;
unsigned long ref_cnt = (unsigned long)handle;
BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
ref_cnt++;
handle = (handle_t *)ref_cnt;
current->journal_info = handle;
return handle;
}
/* Decrement the non-pointer handle value */
static void ext4_put_nojournal(handle_t *handle)
{
unsigned long ref_cnt = (unsigned long)handle;
BUG_ON(ref_cnt == 0);
ref_cnt--;
handle = (handle_t *)ref_cnt;
current->journal_info = handle;
}
/*
* Wrappers for jbd2_journal_start/end.
*
* The only special thing we need to do here is to make sure that all
* journal_end calls result in the superblock being marked dirty, so
* that sync() will call the filesystem's write_super callback if
* appropriate.
*
* To avoid j_barrier hold in userspace when a user calls freeze(),
* ext4 prevents a new handle from being started by s_frozen, which
* is in an upper layer.
*/
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
{
journal_t *journal;
handle_t *handle;
trace_ext4_journal_start(sb, nblocks, _RET_IP_);
if (sb->s_flags & MS_RDONLY)
return ERR_PTR(-EROFS);
journal = EXT4_SB(sb)->s_journal;
handle = ext4_journal_current_handle();
/*
* If a handle has been started, it should be allowed to
* finish, otherwise deadlock could happen between freeze
* and others(e.g. truncate) due to the restart of the
* journal handle if the filesystem is forzen and active
* handles are not stopped.
*/
if (!handle)
vfs_check_frozen(sb, SB_FREEZE_TRANS);
if (!journal)
return ext4_get_nojournal();
/*
* 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.
*/
if (is_journal_aborted(journal)) {
ext4_abort(sb, "Detected aborted journal");
return ERR_PTR(-EROFS);
}
return jbd2_journal_start(journal, nblocks);
}
/*
* The only special thing we need to do here is to make sure that all
* jbd2_journal_stop calls result in the superblock being marked dirty, so
* that sync() will call the filesystem's write_super callback if
* appropriate.
*/
int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
{
struct super_block *sb;
int err;
int rc;
if (!ext4_handle_valid(handle)) {
ext4_put_nojournal(handle);
return 0;
}
sb = handle->h_transaction->t_journal->j_private;
err = handle->h_err;
rc = jbd2_journal_stop(handle);
if (!err)
err = rc;
if (err)
__ext4_std_error(sb, where, line, err);
return err;
}
void ext4_journal_abort_handle(const char *caller, unsigned int line,
const char *err_fn, struct buffer_head *bh,
handle_t *handle, int err)
{
char nbuf[16];
const char *errstr = ext4_decode_error(NULL, err, nbuf);
BUG_ON(!ext4_handle_valid(handle));
if (bh)
BUFFER_TRACE(bh, "abort");
if (!handle->h_err)
handle->h_err = err;
if (is_handle_aborted(handle))
return;
printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
caller, line, errstr, err_fn);
jbd2_journal_abort_handle(handle);
}
static void __save_error_info(struct super_block *sb, const char *func,
unsigned int line)
{
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
es->s_last_error_time = cpu_to_le32(get_seconds());
strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
es->s_last_error_line = cpu_to_le32(line);
if (!es->s_first_error_time) {
es->s_first_error_time = es->s_last_error_time;
strncpy(es->s_first_error_func, func,
sizeof(es->s_first_error_func));
es->s_first_error_line = cpu_to_le32(line);
es->s_first_error_ino = es->s_last_error_ino;
es->s_first_error_block = es->s_last_error_block;
}
/*
* Start the daily error reporting function if it hasn't been
* started already
*/
if (!es->s_error_count)
mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
}
static void save_error_info(struct super_block *sb, const char *func,
unsigned int line)
{
__save_error_info(sb, func, line);
ext4_commit_super(sb, 1);
}
/*
* The del_gendisk() function uninitializes the disk-specific data
* structures, including the bdi structure, without telling anyone
* else. Once this happens, any attempt to call mark_buffer_dirty()
* (for example, by ext4_commit_super), will cause a kernel OOPS.
* This is a kludge to prevent these oops until we can put in a proper
* hook in del_gendisk() to inform the VFS and file system layers.
*/
static int block_device_ejected(struct super_block *sb)
{
struct inode *bd_inode = sb->s_bdev->bd_inode;
struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
return bdi->dev == NULL;
}
/* 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 ext4, 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 jbd2_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 ext4_handle_error(struct super_block *sb)
{
if (sb->s_flags & MS_RDONLY)
return;
if (!test_opt(sb, ERRORS_CONT)) {
journal_t *journal = EXT4_SB(sb)->s_journal;
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
if (journal)
jbd2_journal_abort(journal, -EIO);
}
if (test_opt(sb, ERRORS_RO)) {
ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
sb->s_flags |= MS_RDONLY;
}
if (test_opt(sb, ERRORS_PANIC))
panic("EXT4-fs (device %s): panic forced after error\n",
sb->s_id);
}
void __ext4_error(struct super_block *sb, const char *function,
unsigned int line, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
sb->s_id, function, line, current->comm, &vaf);
va_end(args);
save_error_info(sb, function, line);
ext4_handle_error(sb);
}
void ext4_error_inode(struct inode *inode, const char *function,
unsigned int line, ext4_fsblk_t block,
const char *fmt, ...)
{
va_list args;
struct va_format vaf;
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
es->s_last_error_ino = cpu_to_le32(inode->i_ino);
es->s_last_error_block = cpu_to_le64(block);
save_error_info(inode->i_sb, function, line);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
inode->i_sb->s_id, function, line, inode->i_ino);
if (block)
printk(KERN_CONT "block %llu: ", block);
printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
va_end(args);
ext4_handle_error(inode->i_sb);
}
void ext4_error_file(struct file *file, const char *function,
unsigned int line, ext4_fsblk_t block,
const char *fmt, ...)
{
va_list args;
struct va_format vaf;
struct ext4_super_block *es;
struct inode *inode = file->f_dentry->d_inode;
char pathname[80], *path;
es = EXT4_SB(inode->i_sb)->s_es;
es->s_last_error_ino = cpu_to_le32(inode->i_ino);
save_error_info(inode->i_sb, function, line);
path = d_path(&(file->f_path), pathname, sizeof(pathname));
if (IS_ERR(path))
path = "(unknown)";
printk(KERN_CRIT
"EXT4-fs error (device %s): %s:%d: inode #%lu: ",
inode->i_sb->s_id, function, line, inode->i_ino);
if (block)
printk(KERN_CONT "block %llu: ", block);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
va_end(args);
ext4_handle_error(inode->i_sb);
}
static const char *ext4_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 || (EXT4_SB(sb)->s_journal &&
EXT4_SB(sb)->s_journal->j_flags & JBD2_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;
}
/* __ext4_std_error decodes expected errors from journaling functions
* automatically and invokes the appropriate error response. */
void __ext4_std_error(struct super_block *sb, const char *function,
unsigned int line, 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 = ext4_decode_error(sb, errno, nbuf);
printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
sb->s_id, function, line, errstr);
save_error_info(sb, function, line);
ext4_handle_error(sb);
}
/*
* ext4_abort is a much stronger failure handler than ext4_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 __ext4_abort(struct super_block *sb, const char *function,
unsigned int line, const char *fmt, ...)
{
va_list args;
save_error_info(sb, function, line);
va_start(args, fmt);
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
function, line);
vprintk(fmt, args);
printk("\n");
va_end(args);
if ((sb->s_flags & MS_RDONLY) == 0) {
ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
sb->s_flags |= MS_RDONLY;
EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
if (EXT4_SB(sb)->s_journal)
jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
save_error_info(sb, function, line);
}
if (test_opt(sb, ERRORS_PANIC))
panic("EXT4-fs panic from previous error\n");
}
void ext4_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("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
va_end(args);
}
void __ext4_warning(struct super_block *sb, const char *function,
unsigned int line, const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
sb->s_id, function, line, &vaf);
va_end(args);
}
void __ext4_grp_locked_error(const char *function, unsigned int line,
struct super_block *sb, ext4_group_t grp,
unsigned long ino, ext4_fsblk_t block,
const char *fmt, ...)
__releases(bitlock)
__acquires(bitlock)
{
struct va_format vaf;
va_list args;
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
es->s_last_error_ino = cpu_to_le32(ino);
es->s_last_error_block = cpu_to_le64(block);
__save_error_info(sb, function, line);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
sb->s_id, function, line, grp);
if (ino)
printk(KERN_CONT "inode %lu: ", ino);
if (block)
printk(KERN_CONT "block %llu:", (unsigned long long) block);
printk(KERN_CONT "%pV\n", &vaf);
va_end(args);
if (test_opt(sb, ERRORS_CONT)) {
ext4_commit_super(sb, 0);
return;
}
ext4_unlock_group(sb, grp);
ext4_handle_error(sb);
/*
* We only get here in the ERRORS_RO case; relocking the group
* may be dangerous, but nothing bad will happen since the
* filesystem will have already been marked read/only and the
* journal has been aborted. We return 1 as a hint to callers
* who might what to use the return value from
* ext4_grp_locked_error() to distinguish between the
* ERRORS_CONT and ERRORS_RO case, and perhaps return more
* aggressively from the ext4 function in question, with a
* more appropriate error code.
*/
ext4_lock_group(sb, grp);
return;
}
void ext4_update_dynamic_rev(struct super_block *sb)
{
struct ext4_super_block *es = EXT4_SB(sb)->s_es;
if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
return;
ext4_warning(sb,
"updating to rev %d because of new feature flag, "
"running e2fsck is recommended",
EXT4_DYNAMIC_REV);
es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
es->s_rev_level = cpu_to_le32(EXT4_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 *ext4_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:
ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
__bdevname(dev, b), PTR_ERR(bdev));
return NULL;
}
/*
* Manage pinning (and unpinning) block bitmaps
*/
static void ext4_pin_block_bitmaps(struct super_block *sb)
{
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
struct ext4_group_info *grinfo;
for (i = 0; i < ngroups; i++) {
grinfo = ext4_get_group_info(sb, i);
if (!grinfo->bb_bh)
grinfo->bb_bh = ext4_read_block_bitmap(sb, i);
}
}
static void ext4_unpin_block_bitmaps(struct super_block *sb)
{
ext4_group_t i, ngroups = ext4_get_groups_count(sb);
struct ext4_group_info *grinfo;
for (i = 0; i < ngroups; i++) {
grinfo = ext4_get_group_info(sb, i);
brelse(grinfo->bb_bh);
grinfo->bb_bh = NULL;
}
}
/*
* Release the journal device
*/
static int ext4_blkdev_put(struct block_device *bdev)
{
return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}
static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
{
struct block_device *bdev;
int ret = -ENODEV;
bdev = sbi->journal_bdev;
if (bdev) {
ret = ext4_blkdev_put(bdev);
sbi->journal_bdev = NULL;
}
return ret;
}
static inline struct inode *orphan_list_entry(struct list_head *l)
{
return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
}
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
{
struct list_head *l;
ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
le32_to_cpu(sbi->s_es->s_last_orphan));
printk(KERN_ERR "sb_info orphan list:\n");
list_for_each(l, &sbi->s_orphan) {
struct inode *inode = orphan_list_entry(l);
printk(KERN_ERR " "
"inode %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 ext4_put_super(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
int i, err;
ext4_unregister_li_request(sb);
dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
flush_workqueue(sbi->dio_unwritten_wq);
destroy_workqueue(sbi->dio_unwritten_wq);
lock_super(sb);
if (sb->s_dirt)
ext4_commit_super(sb, 1);
if (sbi->s_journal) {
err = jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
if (err < 0)
ext4_abort(sb, "Couldn't clean up the journal");
}
del_timer(&sbi->s_err_report);
ext4_release_system_zone(sb);
ext4_unpin_block_bitmaps(sb);
ext4_mb_release(sb);
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
if (!(sb->s_flags & MS_RDONLY)) {
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
es->s_state = cpu_to_le16(sbi->s_mount_state);
ext4_commit_super(sb, 1);
}
if (sbi->s_proc) {
remove_proc_entry(sb->s_id, ext4_proc_root);
}
kobject_del(&sbi->s_kobj);
for (i = 0; i < sbi->s_gdb_count; i++)
brelse(sbi->s_group_desc[i]);
ext4_kvfree(sbi->s_group_desc);
ext4_kvfree(sbi->s_flex_groups);
percpu_counter_destroy(&sbi->s_freeclusters_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
for (i = 0; i < 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);
ext4_blkdev_remove(sbi);
}
if (sbi->s_mmp_tsk)
kthread_stop(sbi->s_mmp_tsk);
sb->s_fs_info = NULL;
/*
* Now that we are completely done shutting down the
* superblock, we need to actually destroy the kobject.
*/
unlock_super(sb);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
}
static struct kmem_cache *ext4_inode_cachep;
/*
* Called inside transaction, so use GFP_NOFS
*/
static struct inode *ext4_alloc_inode(struct super_block *sb)
{
struct ext4_inode_info *ei;
ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
if (!ei)
return NULL;
ei->vfs_inode.i_version = 1;
ei->vfs_inode.i_data.writeback_index = 0;
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
INIT_LIST_HEAD(&ei->i_prealloc_list);
spin_lock_init(&ei->i_prealloc_lock);
ei->i_reserved_data_blocks = 0;
ei->i_reserved_meta_blocks = 0;
ei->i_allocated_meta_blocks = 0;
ei->i_da_metadata_calc_len = 0;
spin_lock_init(&(ei->i_block_reservation_lock));
#ifdef CONFIG_QUOTA
ei->i_reserved_quota = 0;
#endif
ei->jinode = NULL;
INIT_LIST_HEAD(&ei->i_completed_io_list);
spin_lock_init(&ei->i_completed_io_lock);
ei->cur_aio_dio = NULL;
ei->i_sync_tid = 0;
ei->i_datasync_tid = 0;
atomic_set(&ei->i_ioend_count, 0);
atomic_set(&ei->i_aiodio_unwritten, 0);
return &ei->vfs_inode;
}
static int ext4_drop_inode(struct inode *inode)
{
int drop = generic_drop_inode(inode);
trace_ext4_drop_inode(inode, drop);
return drop;
}
static void ext4_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}
static void ext4_destroy_inode(struct inode *inode)
{
if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
ext4_msg(inode->i_sb, KERN_ERR,
"Inode %lu (%p): orphan list check failed!",
inode->i_ino, EXT4_I(inode));
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
EXT4_I(inode), sizeof(struct ext4_inode_info),
true);
dump_stack();
}
call_rcu(&inode->i_rcu, ext4_i_callback);
}
static void init_once(void *foo)
{
struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
INIT_LIST_HEAD(&ei->i_orphan);
#ifdef CONFIG_EXT4_FS_XATTR
init_rwsem(&ei->xattr_sem);
#endif
init_rwsem(&ei->i_data_sem);
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
sizeof(struct ext4_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD),
init_once);
if (ext4_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
kmem_cache_destroy(ext4_inode_cachep);
}
void ext4_clear_inode(struct inode *inode)
{
invalidate_inode_buffers(inode);
end_writeback(inode);
dquot_drop(inode);
ext4_discard_preallocations(inode);
if (EXT4_I(inode)->jinode) {
jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
EXT4_I(inode)->jinode);
jbd2_free_inode(EXT4_I(inode)->jinode);
EXT4_I(inode)->jinode = NULL;
}
}
static inline void ext4_show_quota_options(struct seq_file *seq,
struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
struct ext4_sb_info *sbi = EXT4_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
}
/*
* 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 ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
int def_errors;
unsigned long def_mount_opts;
struct super_block *sb = vfs->mnt_sb;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
def_errors = le16_to_cpu(es->s_errors);
if (sbi->s_sb_block != 1)
seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
if (test_opt(sb, MINIX_DF))
seq_puts(seq, ",minixdf");
if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
seq_puts(seq, ",grpid");
if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
seq_puts(seq, ",nogrpid");
if (sbi->s_resuid != EXT4_DEF_RESUID ||
le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
seq_printf(seq, ",resuid=%u", sbi->s_resuid);
}
if (sbi->s_resgid != EXT4_DEF_RESGID ||
le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
seq_printf(seq, ",resgid=%u", sbi->s_resgid);
}
if (test_opt(sb, ERRORS_RO)) {
if (def_errors == EXT4_ERRORS_PANIC ||
def_errors == EXT4_ERRORS_CONTINUE) {
seq_puts(seq, ",errors=remount-ro");
}
}
if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
seq_puts(seq, ",errors=continue");
if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
seq_puts(seq, ",errors=panic");
if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
seq_puts(seq, ",nouid32");
if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
seq_puts(seq, ",debug");
#ifdef CONFIG_EXT4_FS_XATTR
if (test_opt(sb, XATTR_USER))
seq_puts(seq, ",user_xattr");
if (!test_opt(sb, XATTR_USER))
seq_puts(seq, ",nouser_xattr");
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",acl");
if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",noacl");
#endif
if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
seq_printf(seq, ",commit=%u",
(unsigned) (sbi->s_commit_interval / HZ));
}
if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
seq_printf(seq, ",min_batch_time=%u",
(unsigned) sbi->s_min_batch_time);
}
if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
seq_printf(seq, ",max_batch_time=%u",
(unsigned) sbi->s_max_batch_time);
}
/*
* We're changing the default of barrier mount option, so
* let's always display its mount state so it's clear what its
* status is.
*/
seq_puts(seq, ",barrier=");
seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
seq_puts(seq, ",journal_async_commit");
else if (test_opt(sb, JOURNAL_CHECKSUM))
seq_puts(seq, ",journal_checksum");
if (test_opt(sb, I_VERSION))
seq_puts(seq, ",i_version");
if (!test_opt(sb, DELALLOC) &&
!(def_mount_opts & EXT4_DEFM_NODELALLOC))
seq_puts(seq, ",nodelalloc");
if (!test_opt(sb, MBLK_IO_SUBMIT))
seq_puts(seq, ",nomblk_io_submit");
if (sbi->s_stripe)
seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
/*
* journal mode get enabled in different ways
* So just print the value even if we didn't specify it
*/
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
seq_puts(seq, ",data=journal");
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
seq_puts(seq, ",data=ordered");
else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
seq_puts(seq, ",data=writeback");
if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
seq_printf(seq, ",inode_readahead_blks=%u",
sbi->s_inode_readahead_blks);
if (test_opt(sb, DATA_ERR_ABORT))
seq_puts(seq, ",data_err=abort");
if (test_opt(sb, NO_AUTO_DA_ALLOC))
seq_puts(seq, ",noauto_da_alloc");
if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
seq_puts(seq, ",discard");
if (test_opt(sb, NOLOAD))
seq_puts(seq, ",norecovery");
if (test_opt(sb, DIOREAD_NOLOCK))
seq_puts(seq, ",dioread_nolock");
if (test_opt(sb, BLOCK_VALIDITY) &&
!(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
seq_puts(seq, ",block_validity");
if (!test_opt(sb, INIT_INODE_TABLE))
seq_puts(seq, ",noinit_itable");
else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
seq_printf(seq, ",init_itable=%u",
(unsigned) sbi->s_li_wait_mult);
if (sbi->no_hide_stale_gid != -1)
seq_printf(seq, ",nohide_stale_gid=%u", sbi->no_hide_stale_gid);
if (test_opt(sb, PIN_BLOCK_BITMAPS))
seq_puts(seq, ",pin_block_bitmaps");
ext4_show_quota_options(seq, sb);
return 0;
}
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
u64 ino, u32 generation)
{
struct inode *inode;
if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
return ERR_PTR(-ESTALE);
if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
return ERR_PTR(-ESTALE);
/* iget isn't really right if the inode is currently unallocated!!
*
* ext4_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 = ext4_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 *ext4_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,
ext4_nfs_get_inode);
}
static struct dentry *ext4_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,
ext4_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
* jbd2 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 = EXT4_SB(sb)->s_journal;
WARN_ON(PageChecked(page));
if (!page_has_buffers(page))
return 0;
if (journal)
return jbd2_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 ext4_write_dquot(struct dquot *dquot);
static int ext4_acquire_dquot(struct dquot *dquot);
static int ext4_release_dquot(struct dquot *dquot);
static int ext4_mark_dquot_dirty(struct dquot *dquot);
static int ext4_write_info(struct super_block *sb, int type);
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
struct path *path);
static int ext4_quota_off(struct super_block *sb, int type);
static int ext4_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off);
static ssize_t ext4_quota_write(struct super_block *sb, int type,
const char *data, size_t len, loff_t off);
static const struct dquot_operations ext4_quota_operations = {
.get_reserved_space = ext4_get_reserved_space,
.write_dquot = ext4_write_dquot,
.acquire_dquot = ext4_acquire_dquot,
.release_dquot = ext4_release_dquot,
.mark_dirty = ext4_mark_dquot_dirty,
.write_info = ext4_write_info,
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
};
static const struct quotactl_ops ext4_qctl_operations = {
.quota_on = ext4_quota_on,
.quota_off = ext4_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 ext4_sops = {
.alloc_inode = ext4_alloc_inode,
.destroy_inode = ext4_destroy_inode,
.write_inode = ext4_write_inode,
.dirty_inode = ext4_dirty_inode,
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.put_super = ext4_put_super,
.sync_fs = ext4_sync_fs,
.freeze_fs = ext4_freeze,
.unfreeze_fs = ext4_unfreeze,
.statfs = ext4_statfs,
.remount_fs = ext4_remount,
.show_options = ext4_show_options,
#ifdef CONFIG_QUOTA
.quota_read = ext4_quota_read,
.quota_write = ext4_quota_write,
#endif
.bdev_try_to_free_page = bdev_try_to_free_page,
};
static const struct super_operations ext4_nojournal_sops = {
.alloc_inode = ext4_alloc_inode,
.destroy_inode = ext4_destroy_inode,
.write_inode = ext4_write_inode,
.dirty_inode = ext4_dirty_inode,
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.write_super = ext4_write_super,
.put_super = ext4_put_super,
.statfs = ext4_statfs,
.remount_fs = ext4_remount,
.show_options = ext4_show_options,
#ifdef CONFIG_QUOTA
.quota_read = ext4_quota_read,
.quota_write = ext4_quota_write,
#endif
.bdev_try_to_free_page = bdev_try_to_free_page,
};
static const struct export_operations ext4_export_ops = {
.fh_to_dentry = ext4_fh_to_dentry,
.fh_to_parent = ext4_fh_to_parent,
.get_parent = ext4_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_debug, Opt_oldalloc, Opt_orlov,
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
Opt_journal_update, Opt_journal_dev,
Opt_journal_checksum, Opt_journal_async_commit,
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, Opt_i_version,
Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
Opt_inode_readahead_blks, Opt_journal_ioprio,
Opt_dioread_nolock, Opt_dioread_lock,
Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Opt_nohide_stale_gid,
Opt_pin_block_bitmaps, Opt_nopin_block_bitmaps,
};
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_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_noload, "noload"},
{Opt_noload, "norecovery"},
{Opt_nobh, "nobh"},
{Opt_bh, "bh"},
{Opt_commit, "commit=%u"},
{Opt_min_batch_time, "min_batch_time=%u"},
{Opt_max_batch_time, "max_batch_time=%u"},
{Opt_journal_update, "journal=update"},
{Opt_journal_dev, "journal_dev=%u"},
{Opt_journal_checksum, "journal_checksum"},
{Opt_journal_async_commit, "journal_async_commit"},
{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_i_version, "i_version"},
{Opt_stripe, "stripe=%u"},
{Opt_resize, "resize"},
{Opt_delalloc, "delalloc"},
{Opt_nodelalloc, "nodelalloc"},
{Opt_mblk_io_submit, "mblk_io_submit"},
{Opt_nomblk_io_submit, "nomblk_io_submit"},
{Opt_block_validity, "block_validity"},
{Opt_noblock_validity, "noblock_validity"},
{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
{Opt_journal_ioprio, "journal_ioprio=%u"},
{Opt_auto_da_alloc, "auto_da_alloc=%u"},
{Opt_auto_da_alloc, "auto_da_alloc"},
{Opt_noauto_da_alloc, "noauto_da_alloc"},
{Opt_dioread_nolock, "dioread_nolock"},
{Opt_dioread_lock, "dioread_lock"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
{Opt_init_itable, "init_itable=%u"},
{Opt_init_itable, "init_itable"},
{Opt_noinit_itable, "noinit_itable"},
{Opt_nohide_stale_gid, "nohide_stale_gid=%u"},
{Opt_pin_block_bitmaps, "pin_block_bitmaps"},
{Opt_nopin_block_bitmaps, "nopin_block_bitmaps"},
{Opt_err, NULL},
};
static ext4_fsblk_t get_sb_block(void **data)
{
ext4_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 ext4 */
sb_block = simple_strtoul(options, &options, 0);
if (*options && *options != ',') {
printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
(char *) *data);
return 1;
}
if (*options == ',')
options++;
*data = (void *) options;
return sb_block;
}
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
#ifdef CONFIG_QUOTA
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
char *qname;
if (sb_any_quota_loaded(sb) &&
!sbi->s_qf_names[qtype]) {
ext4_msg(sb, KERN_ERR,
"Cannot change journaled "
"quota options when quota turned on");
return 0;
}
qname = match_strdup(args);
if (!qname) {
ext4_msg(sb, KERN_ERR,
"Not enough memory for storing quotafile name");
return 0;
}
if (sbi->s_qf_names[qtype] &&
strcmp(sbi->s_qf_names[qtype], qname)) {
ext4_msg(sb, KERN_ERR,
"%s quota file already specified", QTYPE2NAME(qtype));
kfree(qname);
return 0;
}
sbi->s_qf_names[qtype] = qname;
if (strchr(sbi->s_qf_names[qtype], '/')) {
ext4_msg(sb, KERN_ERR,
"quotafile must be on filesystem root");
kfree(sbi->s_qf_names[qtype]);
sbi->s_qf_names[qtype] = NULL;
return 0;
}
set_opt(sb, QUOTA);
return 1;
}
static int clear_qf_name(struct super_block *sb, int qtype)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (sb_any_quota_loaded(sb) &&
sbi->s_qf_names[qtype]) {
ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
" when quota turned on");
return 0;
}
/*
* The space will be released later when all options are confirmed
* to be correct
*/
sbi->s_qf_names[qtype] = NULL;
return 1;
}
#endif
static int parse_options(char *options, struct super_block *sb,
unsigned long *journal_devnum,
unsigned int *journal_ioprio,
ext4_fsblk_t *n_blocks_count, int is_remount)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
char *p;
substring_t args[MAX_OPT_ARGS];
int data_opt = 0;
int option;
#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:
ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
clear_opt(sb, MINIX_DF);
break;
case Opt_minix_df:
ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
set_opt(sb, MINIX_DF);
break;
case Opt_grpid:
ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
set_opt(sb, GRPID);
break;
case Opt_nogrpid:
ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
clear_opt(sb, GRPID);
break;
case Opt_resuid:
if (match_int(&args[0], &option))
return 0;
sbi->s_resuid = option;
break;
case Opt_resgid:
if (match_int(&args[0], &option))
return 0;
sbi->s_resgid = option;
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(sb, ERRORS_CONT);
clear_opt(sb, ERRORS_RO);
set_opt(sb, ERRORS_PANIC);
break;
case Opt_err_ro:
clear_opt(sb, ERRORS_CONT);
clear_opt(sb, ERRORS_PANIC);
set_opt(sb, ERRORS_RO);
break;
case Opt_err_cont:
clear_opt(sb, ERRORS_RO);
clear_opt(sb, ERRORS_PANIC);
set_opt(sb, ERRORS_CONT);
break;
case Opt_nouid32:
set_opt(sb, NO_UID32);
break;
case Opt_debug:
set_opt(sb, DEBUG);
break;
case Opt_oldalloc:
ext4_msg(sb, KERN_WARNING,
"Ignoring deprecated oldalloc option");
break;
case Opt_orlov:
ext4_msg(sb, KERN_WARNING,
"Ignoring deprecated orlov option");
break;
#ifdef CONFIG_EXT4_FS_XATTR
case Opt_user_xattr:
set_opt(sb, XATTR_USER);
break;
case Opt_nouser_xattr:
clear_opt(sb, XATTR_USER);
break;
#else
case Opt_user_xattr:
case Opt_nouser_xattr:
ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
break;
#endif
#ifdef CONFIG_EXT4_FS_POSIX_ACL
case Opt_acl:
set_opt(sb, POSIX_ACL);
break;
case Opt_noacl:
clear_opt(sb, POSIX_ACL);
break;
#else
case Opt_acl:
case Opt_noacl:
ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
break;
#endif
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) {
ext4_msg(sb, KERN_ERR,
"Cannot specify journal on remount");
return 0;
}
set_opt(sb, UPDATE_JOURNAL);
break;
case Opt_journal_dev:
if (is_remount) {
ext4_msg(sb, KERN_ERR,
"Cannot specify journal on remount");
return 0;
}
if (match_int(&args[0], &option))
return 0;
*journal_devnum = option;
break;
case Opt_journal_checksum:
set_opt(sb, JOURNAL_CHECKSUM);
break;
case Opt_journal_async_commit:
set_opt(sb, JOURNAL_ASYNC_COMMIT);
set_opt(sb, JOURNAL_CHECKSUM);
break;
case Opt_noload:
set_opt(sb, NOLOAD);
break;
case Opt_commit:
if (match_int(&args[0], &option))
return 0;
if (option < 0)
return 0;
if (option == 0)
option = JBD2_DEFAULT_MAX_COMMIT_AGE;
sbi->s_commit_interval = HZ * option;
break;
case Opt_max_batch_time:
if (match_int(&args[0], &option))
return 0;
if (option < 0)
return 0;
if (option == 0)
option = EXT4_DEF_MAX_BATCH_TIME;
sbi->s_max_batch_time = option;
break;
case Opt_min_batch_time:
if (match_int(&args[0], &option))
return 0;
if (option < 0)
return 0;
sbi->s_min_batch_time = option;
break;
case Opt_data_journal:
data_opt = EXT4_MOUNT_JOURNAL_DATA;
goto datacheck;
case Opt_data_ordered:
data_opt = EXT4_MOUNT_ORDERED_DATA;
goto datacheck;
case Opt_data_writeback:
data_opt = EXT4_MOUNT_WRITEBACK_DATA;
datacheck:
if (is_remount) {
if (!sbi->s_journal)
ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
else if (test_opt(sb, DATA_FLAGS) != data_opt) {
ext4_msg(sb, KERN_ERR,
"Cannot change data mode on remount");
return 0;
}
} else {
clear_opt(sb, DATA_FLAGS);
sbi->s_mount_opt |= data_opt;
}
break;
case Opt_data_err_abort:
set_opt(sb, DATA_ERR_ABORT);
break;
case Opt_data_err_ignore:
clear_opt(sb, 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) {
ext4_msg(sb, KERN_ERR, "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(sb, QUOTA);
set_opt(sb, USRQUOTA);
break;
case Opt_grpquota:
set_opt(sb, QUOTA);
set_opt(sb, GRPQUOTA);
break;
case Opt_noquota:
if (sb_any_quota_loaded(sb)) {
ext4_msg(sb, KERN_ERR, "Cannot change quota "
"options when quota turned on");
return 0;
}
clear_opt(sb, QUOTA);
clear_opt(sb, USRQUOTA);
clear_opt(sb, GRPQUOTA);
break;
#else
case Opt_quota:
case Opt_usrquota:
case Opt_grpquota:
ext4_msg(sb, KERN_ERR,
"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:
ext4_msg(sb, KERN_ERR,
"journaled quota options not supported");
break;
case Opt_noquota:
break;
#endif
case Opt_abort:
sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
break;
case Opt_nobarrier:
clear_opt(sb, 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(sb, BARRIER);
else
clear_opt(sb, BARRIER);
break;
case Opt_ignore:
break;
case Opt_resize:
if (!is_remount) {
ext4_msg(sb, KERN_ERR,
"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:
ext4_msg(sb, KERN_WARNING,
"Ignoring deprecated nobh option");
break;
case Opt_bh:
ext4_msg(sb, KERN_WARNING,
"Ignoring deprecated bh option");
break;
case Opt_i_version:
set_opt(sb, I_VERSION);
sb->s_flags |= MS_I_VERSION;
break;
case Opt_nodelalloc:
clear_opt(sb, DELALLOC);
clear_opt2(sb, EXPLICIT_DELALLOC);
break;
case Opt_mblk_io_submit:
set_opt(sb, MBLK_IO_SUBMIT);
break;
case Opt_nomblk_io_submit:
clear_opt(sb, MBLK_IO_SUBMIT);
break;
case Opt_stripe:
if (match_int(&args[0], &option))
return 0;
if (option < 0)
return 0;
sbi->s_stripe = option;
break;
case Opt_delalloc:
set_opt(sb, DELALLOC);
set_opt2(sb, EXPLICIT_DELALLOC);
break;
case Opt_block_validity:
set_opt(sb, BLOCK_VALIDITY);
break;
case Opt_noblock_validity:
clear_opt(sb, BLOCK_VALIDITY);
break;
case Opt_inode_readahead_blks:
if (match_int(&args[0], &option))
return 0;
if (option < 0 || option > (1 << 30))
return 0;
if (option && !is_power_of_2(option)) {
ext4_msg(sb, KERN_ERR,
"EXT4-fs: inode_readahead_blks"
" must be a power of 2");
return 0;
}
sbi->s_inode_readahead_blks = option;
break;
case Opt_journal_ioprio:
if (match_int(&args[0], &option))
return 0;
if (option < 0 || option > 7)
break;
*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
option);
break;
case Opt_noauto_da_alloc:
set_opt(sb, NO_AUTO_DA_ALLOC);
break;
case Opt_auto_da_alloc:
if (args[0].from) {
if (match_int(&args[0], &option))
return 0;
} else
option = 1; /* No argument, default to 1 */
if (option)
clear_opt(sb, NO_AUTO_DA_ALLOC);
else
set_opt(sb,NO_AUTO_DA_ALLOC);
break;
case Opt_discard:
set_opt(sb, DISCARD);
break;
case Opt_nodiscard:
clear_opt(sb, DISCARD);
break;
case Opt_dioread_nolock:
set_opt(sb, DIOREAD_NOLOCK);
break;
case Opt_dioread_lock:
clear_opt(sb, DIOREAD_NOLOCK);
break;
case Opt_init_itable:
set_opt(sb, INIT_INODE_TABLE);
if (args[0].from) {
if (match_int(&args[0], &option))
return 0;
} else
option = EXT4_DEF_LI_WAIT_MULT;
if (option < 0)
return 0;
sbi->s_li_wait_mult = option;
break;
case Opt_nohide_stale_gid:
if (match_int(&args[0], &option))
return 0;
/* -1 for disabled, otherwise it's valid. */
sbi->no_hide_stale_gid = option;
break;
case Opt_noinit_itable:
clear_opt(sb, INIT_INODE_TABLE);
break;
case Opt_pin_block_bitmaps:
set_opt(sb, PIN_BLOCK_BITMAPS);
break;
case Opt_nopin_block_bitmaps:
clear_opt(sb, PIN_BLOCK_BITMAPS);
break;
default:
ext4_msg(sb, KERN_ERR,
"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(sb, USRQUOTA);
if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
clear_opt(sb, GRPQUOTA);
if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
ext4_msg(sb, KERN_ERR, "old and new quota "
"format mixing");
return 0;
}
if (!sbi->s_jquota_fmt) {
ext4_msg(sb, KERN_ERR, "journaled quota format "
"not specified");
return 0;
}
} else {
if (sbi->s_jquota_fmt) {
ext4_msg(sb, KERN_ERR, "journaled quota format "
"specified with no journaling "
"enabled");
return 0;
}
}
#endif
return 1;
}
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
int read_only)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
int res = 0;
if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
ext4_msg(sb, KERN_ERR, "revision level too high, "
"forcing read-only mode");
res = MS_RDONLY;
}
if (read_only)
goto done;
if (!(sbi->s_mount_state & EXT4_VALID_FS))
ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
"running e2fsck is recommended");
else if ((sbi->s_mount_state & EXT4_ERROR_FS))
ext4_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) >=
(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
ext4_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()))
ext4_msg(sb, KERN_WARNING,
"warning: checktime reached, "
"running e2fsck is recommended");
if (!sbi->s_journal)
es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
le16_add_cpu(&es->s_mnt_count, 1);
es->s_mtime = cpu_to_le32(get_seconds());
ext4_update_dynamic_rev(sb);
if (sbi->s_journal)
EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ext4_commit_super(sb, 1);
done:
if (test_opt(sb, DEBUG))
printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
sb->s_blocksize,
sbi->s_groups_count,
EXT4_BLOCKS_PER_GROUP(sb),
EXT4_INODES_PER_GROUP(sb),
sbi->s_mount_opt, sbi->s_mount_opt2);
cleancache_init_fs(sb);
return res;
}
static int ext4_fill_flex_info(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *gdp = NULL;
ext4_group_t flex_group_count;
ext4_group_t flex_group;
unsigned int groups_per_flex = 0;
size_t size;
int i;
sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
sbi->s_log_groups_per_flex = 0;
return 1;
}
groups_per_flex = 1 << sbi->s_log_groups_per_flex;
/* We allocate both existing and potentially added groups */
flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
size = flex_group_count * sizeof(struct flex_groups);
sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
if (sbi->s_flex_groups == NULL) {
ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
flex_group_count);
goto failed;
}
for (i = 0; i < sbi->s_groups_count; i++) {
gdp = ext4_get_group_desc(sb, i, NULL);
flex_group = ext4_flex_group(sbi, i);
atomic_add(ext4_free_inodes_count(sb, gdp),
&sbi->s_flex_groups[flex_group].free_inodes);
atomic_add(ext4_free_group_clusters(sb, gdp),
&sbi->s_flex_groups[flex_group].free_clusters);
atomic_add(ext4_used_dirs_count(sb, gdp),
&sbi->s_flex_groups[flex_group].used_dirs);
}
return 1;
failed:
return 0;
}
__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
struct ext4_group_desc *gdp)
{
__u16 crc = 0;
if (sbi->s_es->s_feature_ro_compat &
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
int offset = offsetof(struct ext4_group_desc, bg_checksum);
__le32 le_group = cpu_to_le32(block_group);
crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
crc = crc16(crc, (__u8 *)gdp, offset);
offset += sizeof(gdp->bg_checksum); /* skip checksum */
/* for checksum of struct ext4_group_desc do the rest...*/
if ((sbi->s_es->s_feature_incompat &
cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
offset < le16_to_cpu(sbi->s_es->s_desc_size))
crc = crc16(crc, (__u8 *)gdp + offset,
le16_to_cpu(sbi->s_es->s_desc_size) -
offset);
}
return cpu_to_le16(crc);
}
int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
struct ext4_group_desc *gdp)
{
if ((sbi->s_es->s_feature_ro_compat &
cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
(gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
return 0;
return 1;
}
/* Called at mount-time, super-block is locked */
static int ext4_check_descriptors(struct super_block *sb,
ext4_group_t *first_not_zeroed)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
ext4_fsblk_t last_block;
ext4_fsblk_t block_bitmap;
ext4_fsblk_t inode_bitmap;
ext4_fsblk_t inode_table;
int flexbg_flag = 0;
ext4_group_t i, grp = sbi->s_groups_count;
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
flexbg_flag = 1;
ext4_debug("Checking group descriptors");
for (i = 0; i < sbi->s_groups_count; i++) {
struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
if (i == sbi->s_groups_count - 1 || flexbg_flag)
last_block = ext4_blocks_count(sbi->s_es) - 1;
else
last_block = first_block +
(EXT4_BLOCKS_PER_GROUP(sb) - 1);
if ((grp == sbi->s_groups_count) &&
!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
grp = i;
block_bitmap = ext4_block_bitmap(sb, gdp);
if (block_bitmap < first_block || block_bitmap > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Block bitmap for group %u not in group "
"(block %llu)!", i, block_bitmap);
return 0;
}
inode_bitmap = ext4_inode_bitmap(sb, gdp);
if (inode_bitmap < first_block || inode_bitmap > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Inode bitmap for group %u not in group "
"(block %llu)!", i, inode_bitmap);
return 0;
}
inode_table = ext4_inode_table(sb, gdp);
if (inode_table < first_block ||
inode_table + sbi->s_itb_per_group - 1 > last_block) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Inode table for group %u not in group "
"(block %llu)!", i, inode_table);
return 0;
}
ext4_lock_group(sb, i);
if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
"Checksum for group %u failed (%u!=%u)",
i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
gdp)), le16_to_cpu(gdp->bg_checksum));
if (!(sb->s_flags & MS_RDONLY)) {
ext4_unlock_group(sb, i);
return 0;
}
}
ext4_unlock_group(sb, i);
if (!flexbg_flag)
first_block += EXT4_BLOCKS_PER_GROUP(sb);
}
if (NULL != first_not_zeroed)
*first_not_zeroed = grp;
ext4_free_blocks_count_set(sbi->s_es,
EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
return 1;
}
/* ext4_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
* ext4_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 ext4_orphan_cleanup(struct super_block *sb,
struct ext4_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)) {
ext4_msg(sb, KERN_ERR, "write access "
"unavailable, skipping orphan cleanup");
return;
}
/* Check if feature set would not allow a r/w mount */
if (!ext4_feature_set_ok(sb, 0)) {
ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
"unknown ROCOMPAT features");
return;
}
if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
if (es->s_last_orphan)
jbd_debug(1, "Errors on filesystem, "
"clearing orphan list.\n");
es->s_last_orphan = 0;
jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
return;
}
if (s_flags & MS_RDONLY) {
ext4_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 < MAXQUOTAS; i++) {
if (EXT4_SB(sb)->s_qf_names[i]) {
int ret = ext4_quota_on_mount(sb, i);
if (ret < 0)
ext4_msg(sb, KERN_ERR,
"Cannot turn on journaled "
"quota: error %d", ret);
}
}
#endif
while (es->s_last_orphan) {
struct inode *inode;
inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
if (IS_ERR(inode)) {
es->s_last_orphan = 0;
break;
}
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
dquot_initialize(inode);
if (inode->i_nlink) {
ext4_msg(sb, KERN_DEBUG,
"%s: truncating inode %lu to %lld bytes",
__func__, inode->i_ino, inode->i_size);
jbd_debug(2, "truncating inode %lu to %lld bytes\n",
inode->i_ino, inode->i_size);
ext4_truncate(inode);
nr_truncates++;
} else {
ext4_msg(sb, KERN_DEBUG,
"%s: deleting unreferenced inode %lu",
__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)
ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
PLURAL(nr_orphans));
if (nr_truncates)
ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
PLURAL(nr_truncates));
#ifdef CONFIG_QUOTA
/* Turn quotas off */
for (i = 0; i < MAXQUOTAS; i++) {
if (sb_dqopt(sb)->files[i])
dquot_quota_off(sb, i);
}
#endif
sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
/*
* Maximal extent format file size.
* Resulting logical blkno at s_maxbytes must fit in our on-disk
* extent format containers, within a sector_t, and within i_blocks
* in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
* so that won't be a limiting factor.
*
* However there is other limiting factor. We do store extents in the form
* of starting block and length, hence the resulting length of the extent
* covering maximum file size must fit into on-disk format containers as
* well. Given that length is always by 1 unit bigger than max unit (because
* we count 0 as well) we have to lower the s_maxbytes by one fs block.
*
* Note, this does *not* consider any metadata overhead for vfs i_blocks.
*/
static loff_t ext4_max_size(int blkbits, int has_huge_files)
{
loff_t res;
loff_t upper_limit = MAX_LFS_FILESIZE;
/* small i_blocks in vfs inode? */
if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
/*
* CONFIG_LBDAF is not enabled implies the inode
* i_block represent total blocks in 512 bytes
* 32 == size of vfs inode i_blocks * 8
*/
upper_limit = (1LL << 32) - 1;
/* total blocks in file system block size */
upper_limit >>= (blkbits - 9);
upper_limit <<= blkbits;
}
/*
* 32-bit extent-start container, ee_block. We lower the maxbytes
* by one fs block, so ee_len can cover the extent of maximum file
* size
*/
res = (1LL << 32) - 1;
res <<= blkbits;
/* Sanity check against vm- & vfs- imposed limits */
if (res > upper_limit)
res = upper_limit;
return res;
}
/*
* Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
* block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
* We need to be 1 filesystem block less than the 2^48 sector limit.
*/
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
{
loff_t res = EXT4_NDIR_BLOCKS;
int meta_blocks;
loff_t upper_limit;
/* This is calculated to be the largest file size for a dense, block
* mapped file such that the file's total number of 512-byte sectors,
* including data and all indirect blocks, does not exceed (2^48 - 1).
*
* __u32 i_blocks_lo and _u16 i_blocks_high represent the total
* number of 512-byte sectors of the file.
*/
if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
/*
* !has_huge_files or CONFIG_LBDAF not enabled implies that
* the inode i_block field represents total file blocks in
* 2^32 512-byte sectors == size of vfs inode i_blocks * 8
*/
upper_limit = (1LL << 32) - 1;
/* total blocks in file system block size */
upper_limit >>= (bits - 9);
} else {
/*
* We use 48 bit ext4_inode i_blocks
* With EXT4_HUGE_FILE_FL set the i_blocks
* represent total number of blocks in
* file system block size
*/
upper_limit = (1LL << 48) - 1;
}
/* 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 ext4_fsblk_t descriptor_loc(struct super_block *sb,
ext4_fsblk_t logical_sb_block, int nr)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
ext4_group_t bg, first_meta_bg;
int has_super = 0;
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
nr < first_meta_bg)
return logical_sb_block + nr + 1;
bg = sbi->s_desc_per_block * nr;
if (ext4_bg_has_super(sb, bg))
has_super = 1;
return (has_super + ext4_group_first_block_no(sb, bg));
}
/**
* ext4_get_stripe_size: Get the stripe size.
* @sbi: In memory super block info
*
* If we have specified it via mount option, then
* use the mount option value. If the value specified at mount time is
* greater than the blocks per group use the super block value.
* If the super block value is greater than blocks per group return 0.
* Allocator needs it be less than blocks per group.
*
*/
static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
{
unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
unsigned long stripe_width =
le32_to_cpu(sbi->s_es->s_raid_stripe_width);
int ret;
if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
ret = sbi->s_stripe;
else if (stripe_width <= sbi->s_blocks_per_group)
ret = stripe_width;
else if (stride <= sbi->s_blocks_per_group)
ret = stride;
else
ret = 0;
/*
* If the stripe width is 1, this makes no sense and
* we set it to 0 to turn off stripe handling code.
*/
if (ret <= 1)
ret = 0;
return ret;
}
/* sysfs supprt */
struct ext4_attr {
struct attribute attr;
ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
const char *, size_t);
int offset;
};
static int parse_strtoul(const char *buf,
unsigned long max, unsigned long *value)
{
char *endp;
*value = simple_strtoul(skip_spaces(buf), &endp, 0);
endp = skip_spaces(endp);
if (*endp || *value > max)
return -EINVAL;
return 0;
}
static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
struct ext4_sb_info *sbi,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%llu\n",
(s64) EXT4_C2B(sbi,
percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
}
static ssize_t session_write_kbytes_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
struct super_block *sb = sbi->s_buddy_cache->i_sb;
if (!sb->s_bdev->bd_part)
return snprintf(buf, PAGE_SIZE, "0\n");
return snprintf(buf, PAGE_SIZE, "%lu\n",
(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
sbi->s_sectors_written_start) >> 1);
}
static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
struct super_block *sb = sbi->s_buddy_cache->i_sb;
if (!sb->s_bdev->bd_part)
return snprintf(buf, PAGE_SIZE, "0\n");
return snprintf(buf, PAGE_SIZE, "%llu\n",
(unsigned long long)(sbi->s_kbytes_written +
((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
EXT4_SB(sb)->s_sectors_written_start) >> 1)));
}
static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
struct ext4_sb_info *sbi,
const char *buf, size_t count)
{
unsigned long t;
if (parse_strtoul(buf, 0x40000000, &t))
return -EINVAL;
if (t && !is_power_of_2(t))
return -EINVAL;
sbi->s_inode_readahead_blks = t;
return count;
}
static ssize_t sbi_ui_show(struct ext4_attr *a,
struct ext4_sb_info *sbi, char *buf)
{
unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}
static ssize_t sbi_ui_store(struct ext4_attr *a,
struct ext4_sb_info *sbi,
const char *buf, size_t count)
{
unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
unsigned long t;
if (parse_strtoul(buf, 0xffffffff, &t))
return -EINVAL;
*ui = t;
return count;
}
#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
static struct ext4_attr ext4_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
.offset = offsetof(struct ext4_sb_info, _elname), \
}
#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname) \
EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
#define ATTR_LIST(name) &ext4_attr_##name.attr
EXT4_RO_ATTR(delayed_allocation_blocks);
EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
inode_readahead_blks_store, s_inode_readahead_blks);
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
static struct attribute *ext4_attrs[] = {
ATTR_LIST(delayed_allocation_blocks),
ATTR_LIST(session_write_kbytes),
ATTR_LIST(lifetime_write_kbytes),
ATTR_LIST(inode_readahead_blks),
ATTR_LIST(inode_goal),
ATTR_LIST(mb_stats),
ATTR_LIST(mb_max_to_scan),
ATTR_LIST(mb_min_to_scan),
ATTR_LIST(mb_order2_req),
ATTR_LIST(mb_stream_req),
ATTR_LIST(mb_group_prealloc),
ATTR_LIST(max_writeback_mb_bump),
NULL,
};
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
EXT4_INFO_ATTR(batched_discard);
static struct attribute *ext4_feat_attrs[] = {
ATTR_LIST(lazy_itable_init),
ATTR_LIST(batched_discard),
NULL,
};
static ssize_t ext4_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
s_kobj);
struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
return a->show ? a->show(a, sbi, buf) : 0;
}
static ssize_t ext4_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t len)
{
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
s_kobj);
struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
return a->store ? a->store(a, sbi, buf, len) : 0;
}
static void ext4_sb_release(struct kobject *kobj)
{
struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
s_kobj);
complete(&sbi->s_kobj_unregister);
}
static const struct sysfs_ops ext4_attr_ops = {
.show = ext4_attr_show,
.store = ext4_attr_store,
};
static struct kobj_type ext4_ktype = {
.default_attrs = ext4_attrs,
.sysfs_ops = &ext4_attr_ops,
.release = ext4_sb_release,
};
static void ext4_feat_release(struct kobject *kobj)
{
complete(&ext4_feat->f_kobj_unregister);
}
static struct kobj_type ext4_feat_ktype = {
.default_attrs = ext4_feat_attrs,
.sysfs_ops = &ext4_attr_ops,
.release = ext4_feat_release,
};
/*
* Check whether this filesystem can be mounted based on
* the features present and the RDONLY/RDWR mount requested.
* Returns 1 if this filesystem can be mounted as requested,
* 0 if it cannot be.
*/
static int ext4_feature_set_ok(struct super_block *sb, int readonly)
{
if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
ext4_msg(sb, KERN_ERR,
"Couldn't mount because of "
"unsupported optional features (%x)",
(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
~EXT4_FEATURE_INCOMPAT_SUPP));
return 0;
}
if (readonly)
return 1;
/* Check that feature set is OK for a read-write mount */
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
"unsupported optional features (%x)",
(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
~EXT4_FEATURE_RO_COMPAT_SUPP));
return 0;
}
/*
* Large file size enabled file system can only be mounted
* read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
*/
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
if (sizeof(blkcnt_t) < sizeof(u64)) {
ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
"cannot be mounted RDWR without "
"CONFIG_LBDAF");
return 0;
}
}
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
ext4_msg(sb, KERN_ERR,
"Can't support bigalloc feature without "
"extents feature\n");
return 0;
}
return 1;
}
/*
* This function is called once a day if we have errors logged
* on the file system
*/
static void print_daily_error_info(unsigned long arg)
{
struct super_block *sb = (struct super_block *) arg;
struct ext4_sb_info *sbi;
struct ext4_super_block *es;
sbi = EXT4_SB(sb);
es = sbi->s_es;
if (es->s_error_count)
ext4_msg(sb, KERN_NOTICE, "error count: %u",
le32_to_cpu(es->s_error_count));
if (es->s_first_error_time) {
printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
sb->s_id, le32_to_cpu(es->s_first_error_time),
(int) sizeof(es->s_first_error_func),
es->s_first_error_func,
le32_to_cpu(es->s_first_error_line));
if (es->s_first_error_ino)
printk(": inode %u",
le32_to_cpu(es->s_first_error_ino));
if (es->s_first_error_block)
printk(": block %llu", (unsigned long long)
le64_to_cpu(es->s_first_error_block));
printk("\n");
}
if (es->s_last_error_time) {
printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
sb->s_id, le32_to_cpu(es->s_last_error_time),
(int) sizeof(es->s_last_error_func),
es->s_last_error_func,
le32_to_cpu(es->s_last_error_line));
if (es->s_last_error_ino)
printk(": inode %u",
le32_to_cpu(es->s_last_error_ino));
if (es->s_last_error_block)
printk(": block %llu", (unsigned long long)
le64_to_cpu(es->s_last_error_block));
printk("\n");
}
mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
}
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
struct ext4_group_desc *gdp = NULL;
ext4_group_t group, ngroups;
struct super_block *sb;
unsigned long timeout = 0;
int ret = 0;
sb = elr->lr_super;
ngroups = EXT4_SB(sb)->s_groups_count;
for (group = elr->lr_next_group; group < ngroups; group++) {
gdp = ext4_get_group_desc(sb, group, NULL);
if (!gdp) {
ret = 1;
break;
}
if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
break;
}
if (group == ngroups)
ret = 1;
if (!ret) {
timeout = jiffies;
ret = ext4_init_inode_table(sb, group,
elr->lr_timeout ? 0 : 1);
if (elr->lr_timeout == 0) {
timeout = (jiffies - timeout) *
elr->lr_sbi->s_li_wait_mult;
elr->lr_timeout = timeout;
}
elr->lr_next_sched = jiffies + elr->lr_timeout;
elr->lr_next_group = group + 1;
}
return ret;
}
/*
* Remove lr_request from the list_request and free the
* request structure. Should be called with li_list_mtx held
*/
static void ext4_remove_li_request(struct ext4_li_request *elr)
{
struct ext4_sb_info *sbi;
if (!elr)
return;
sbi = elr->lr_sbi;
list_del(&elr->lr_request);
sbi->s_li_request = NULL;
kfree(elr);
}
static void ext4_unregister_li_request(struct super_block *sb)
{
mutex_lock(&ext4_li_mtx);
if (!ext4_li_info) {
mutex_unlock(&ext4_li_mtx);
return;
}
mutex_lock(&ext4_li_info->li_list_mtx);
ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
mutex_unlock(&ext4_li_info->li_list_mtx);
mutex_unlock(&ext4_li_mtx);
}
static struct task_struct *ext4_lazyinit_task;
/*
* This is the function where ext4lazyinit thread lives. It walks
* through the request list searching for next scheduled filesystem.
* When such a fs is found, run the lazy initialization request
* (ext4_rn_li_request) and keep track of the time spend in this
* function. Based on that time we compute next schedule time of
* the request. When walking through the list is complete, compute
* next waking time and put itself into sleep.
*/
static int ext4_lazyinit_thread(void *arg)
{
struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
struct list_head *pos, *n;
struct ext4_li_request *elr;
unsigned long next_wakeup, cur;
BUG_ON(NULL == eli);
cont_thread:
while (true) {
next_wakeup = MAX_JIFFY_OFFSET;
mutex_lock(&eli->li_list_mtx);
if (list_empty(&eli->li_request_list)) {
mutex_unlock(&eli->li_list_mtx);
goto exit_thread;
}
list_for_each_safe(pos, n, &eli->li_request_list) {
elr = list_entry(pos, struct ext4_li_request,
lr_request);
if (time_after_eq(jiffies, elr->lr_next_sched)) {
if (ext4_run_li_request(elr) != 0) {
/* error, remove the lazy_init job */
ext4_remove_li_request(elr);
continue;
}
}
if (time_before(elr->lr_next_sched, next_wakeup))
next_wakeup = elr->lr_next_sched;
}
mutex_unlock(&eli->li_list_mtx);
if (freezing(current))
refrigerator();
cur = jiffies;
if ((time_after_eq(cur, next_wakeup)) ||
(MAX_JIFFY_OFFSET == next_wakeup)) {
cond_resched();
continue;
}
schedule_timeout_interruptible(next_wakeup - cur);
if (kthread_should_stop()) {
ext4_clear_request_list();
goto exit_thread;
}
}
exit_thread:
/*
* It looks like the request list is empty, but we need
* to check it under the li_list_mtx lock, to prevent any
* additions into it, and of course we should lock ext4_li_mtx
* to atomically free the list and ext4_li_info, because at
* this point another ext4 filesystem could be registering
* new one.
*/
mutex_lock(&ext4_li_mtx);
mutex_lock(&eli->li_list_mtx);
if (!list_empty(&eli->li_request_list)) {
mutex_unlock(&eli->li_list_mtx);
mutex_unlock(&ext4_li_mtx);
goto cont_thread;
}
mutex_unlock(&eli->li_list_mtx);
kfree(ext4_li_info);
ext4_li_info = NULL;
mutex_unlock(&ext4_li_mtx);
return 0;
}
static void ext4_clear_request_list(void)
{
struct list_head *pos, *n;
struct ext4_li_request *elr;
mutex_lock(&ext4_li_info->li_list_mtx);
list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
elr = list_entry(pos