mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1654 lines
44 KiB
1654 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* linux/fs/ext2/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/string.h> |
|
#include <linux/fs.h> |
|
#include <linux/slab.h> |
|
#include <linux/init.h> |
|
#include <linux/blkdev.h> |
|
#include <linux/parser.h> |
|
#include <linux/random.h> |
|
#include <linux/buffer_head.h> |
|
#include <linux/exportfs.h> |
|
#include <linux/vfs.h> |
|
#include <linux/seq_file.h> |
|
#include <linux/mount.h> |
|
#include <linux/log2.h> |
|
#include <linux/quotaops.h> |
|
#include <linux/uaccess.h> |
|
#include <linux/dax.h> |
|
#include <linux/iversion.h> |
|
#include "ext2.h" |
|
#include "xattr.h" |
|
#include "acl.h" |
|
|
|
static void ext2_write_super(struct super_block *sb); |
|
static int ext2_remount (struct super_block * sb, int * flags, char * data); |
|
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
|
static int ext2_sync_fs(struct super_block *sb, int wait); |
|
static int ext2_freeze(struct super_block *sb); |
|
static int ext2_unfreeze(struct super_block *sb); |
|
|
|
void ext2_error(struct super_block *sb, const char *function, |
|
const char *fmt, ...) |
|
{ |
|
struct va_format vaf; |
|
va_list args; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
struct ext2_super_block *es = sbi->s_es; |
|
|
|
if (!sb_rdonly(sb)) { |
|
spin_lock(&sbi->s_lock); |
|
sbi->s_mount_state |= EXT2_ERROR_FS; |
|
es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
|
spin_unlock(&sbi->s_lock); |
|
ext2_sync_super(sb, es, 1); |
|
} |
|
|
|
va_start(args, fmt); |
|
|
|
vaf.fmt = fmt; |
|
vaf.va = &args; |
|
|
|
printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", |
|
sb->s_id, function, &vaf); |
|
|
|
va_end(args); |
|
|
|
if (test_opt(sb, ERRORS_PANIC)) |
|
panic("EXT2-fs: panic from previous error\n"); |
|
if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { |
|
ext2_msg(sb, KERN_CRIT, |
|
"error: remounting filesystem read-only"); |
|
sb->s_flags |= SB_RDONLY; |
|
} |
|
} |
|
|
|
void ext2_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("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
|
|
|
va_end(args); |
|
} |
|
|
|
/* |
|
* This must be called with sbi->s_lock held. |
|
*/ |
|
void ext2_update_dynamic_rev(struct super_block *sb) |
|
{ |
|
struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
|
return; |
|
|
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: updating to rev %d because of " |
|
"new feature flag, running e2fsck is recommended", |
|
EXT2_DYNAMIC_REV); |
|
|
|
es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
|
es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
|
es->s_rev_level = cpu_to_le32(EXT2_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. |
|
*/ |
|
} |
|
|
|
#ifdef CONFIG_QUOTA |
|
static int ext2_quota_off(struct super_block *sb, int type); |
|
|
|
static void ext2_quota_off_umount(struct super_block *sb) |
|
{ |
|
int type; |
|
|
|
for (type = 0; type < MAXQUOTAS; type++) |
|
ext2_quota_off(sb, type); |
|
} |
|
#else |
|
static inline void ext2_quota_off_umount(struct super_block *sb) |
|
{ |
|
} |
|
#endif |
|
|
|
static void ext2_put_super (struct super_block * sb) |
|
{ |
|
int db_count; |
|
int i; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
|
|
ext2_quota_off_umount(sb); |
|
|
|
ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
|
sbi->s_ea_block_cache = NULL; |
|
|
|
if (!sb_rdonly(sb)) { |
|
struct ext2_super_block *es = sbi->s_es; |
|
|
|
spin_lock(&sbi->s_lock); |
|
es->s_state = cpu_to_le16(sbi->s_mount_state); |
|
spin_unlock(&sbi->s_lock); |
|
ext2_sync_super(sb, es, 1); |
|
} |
|
db_count = sbi->s_gdb_count; |
|
for (i = 0; i < db_count; i++) |
|
brelse(sbi->s_group_desc[i]); |
|
kfree(sbi->s_group_desc); |
|
kfree(sbi->s_debts); |
|
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); |
|
sb->s_fs_info = NULL; |
|
kfree(sbi->s_blockgroup_lock); |
|
fs_put_dax(sbi->s_daxdev); |
|
kfree(sbi); |
|
} |
|
|
|
static struct kmem_cache * ext2_inode_cachep; |
|
|
|
static struct inode *ext2_alloc_inode(struct super_block *sb) |
|
{ |
|
struct ext2_inode_info *ei; |
|
ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
|
if (!ei) |
|
return NULL; |
|
ei->i_block_alloc_info = NULL; |
|
inode_set_iversion(&ei->vfs_inode, 1); |
|
#ifdef CONFIG_QUOTA |
|
memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
|
#endif |
|
|
|
return &ei->vfs_inode; |
|
} |
|
|
|
static void ext2_free_in_core_inode(struct inode *inode) |
|
{ |
|
kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
|
} |
|
|
|
static void init_once(void *foo) |
|
{ |
|
struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
|
|
|
rwlock_init(&ei->i_meta_lock); |
|
#ifdef CONFIG_EXT2_FS_XATTR |
|
init_rwsem(&ei->xattr_sem); |
|
#endif |
|
mutex_init(&ei->truncate_mutex); |
|
#ifdef CONFIG_FS_DAX |
|
init_rwsem(&ei->dax_sem); |
|
#endif |
|
inode_init_once(&ei->vfs_inode); |
|
} |
|
|
|
static int __init init_inodecache(void) |
|
{ |
|
ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", |
|
sizeof(struct ext2_inode_info), 0, |
|
(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
|
SLAB_ACCOUNT), |
|
offsetof(struct ext2_inode_info, i_data), |
|
sizeof_field(struct ext2_inode_info, i_data), |
|
init_once); |
|
if (ext2_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(ext2_inode_cachep); |
|
} |
|
|
|
static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
|
{ |
|
struct super_block *sb = root->d_sb; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
struct ext2_super_block *es = sbi->s_es; |
|
unsigned long def_mount_opts; |
|
|
|
spin_lock(&sbi->s_lock); |
|
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 & EXT2_DEFM_BSDGROUPS)) |
|
seq_puts(seq, ",nogrpid"); |
|
if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
|
le16_to_cpu(es->s_def_resuid) != EXT2_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, EXT2_DEF_RESGID)) || |
|
le16_to_cpu(es->s_def_resgid) != EXT2_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 == EXT2_ERRORS_PANIC || |
|
def_errors == EXT2_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"); |
|
if (test_opt(sb, OLDALLOC)) |
|
seq_puts(seq, ",oldalloc"); |
|
|
|
#ifdef CONFIG_EXT2_FS_XATTR |
|
if (test_opt(sb, XATTR_USER)) |
|
seq_puts(seq, ",user_xattr"); |
|
if (!test_opt(sb, XATTR_USER) && |
|
(def_mount_opts & EXT2_DEFM_XATTR_USER)) { |
|
seq_puts(seq, ",nouser_xattr"); |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL |
|
if (test_opt(sb, POSIX_ACL)) |
|
seq_puts(seq, ",acl"); |
|
if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) |
|
seq_puts(seq, ",noacl"); |
|
#endif |
|
|
|
if (test_opt(sb, NOBH)) |
|
seq_puts(seq, ",nobh"); |
|
|
|
if (test_opt(sb, USRQUOTA)) |
|
seq_puts(seq, ",usrquota"); |
|
|
|
if (test_opt(sb, GRPQUOTA)) |
|
seq_puts(seq, ",grpquota"); |
|
|
|
if (test_opt(sb, XIP)) |
|
seq_puts(seq, ",xip"); |
|
|
|
if (test_opt(sb, DAX)) |
|
seq_puts(seq, ",dax"); |
|
|
|
if (!test_opt(sb, RESERVATION)) |
|
seq_puts(seq, ",noreservation"); |
|
|
|
spin_unlock(&sbi->s_lock); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_QUOTA |
|
static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
|
static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
|
static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
|
const struct path *path); |
|
static struct dquot **ext2_get_dquots(struct inode *inode) |
|
{ |
|
return EXT2_I(inode)->i_dquot; |
|
} |
|
|
|
static const struct quotactl_ops ext2_quotactl_ops = { |
|
.quota_on = ext2_quota_on, |
|
.quota_off = ext2_quota_off, |
|
.quota_sync = dquot_quota_sync, |
|
.get_state = dquot_get_state, |
|
.set_info = dquot_set_dqinfo, |
|
.get_dqblk = dquot_get_dqblk, |
|
.set_dqblk = dquot_set_dqblk, |
|
.get_nextdqblk = dquot_get_next_dqblk, |
|
}; |
|
#endif |
|
|
|
static const struct super_operations ext2_sops = { |
|
.alloc_inode = ext2_alloc_inode, |
|
.free_inode = ext2_free_in_core_inode, |
|
.write_inode = ext2_write_inode, |
|
.evict_inode = ext2_evict_inode, |
|
.put_super = ext2_put_super, |
|
.sync_fs = ext2_sync_fs, |
|
.freeze_fs = ext2_freeze, |
|
.unfreeze_fs = ext2_unfreeze, |
|
.statfs = ext2_statfs, |
|
.remount_fs = ext2_remount, |
|
.show_options = ext2_show_options, |
|
#ifdef CONFIG_QUOTA |
|
.quota_read = ext2_quota_read, |
|
.quota_write = ext2_quota_write, |
|
.get_dquots = ext2_get_dquots, |
|
#endif |
|
}; |
|
|
|
static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
|
u64 ino, u32 generation) |
|
{ |
|
struct inode *inode; |
|
|
|
if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
|
return ERR_PTR(-ESTALE); |
|
if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
|
return ERR_PTR(-ESTALE); |
|
|
|
/* |
|
* ext2_iget isn't quite right if the inode is currently unallocated! |
|
* However ext2_iget currently does appropriate checks to handle stale |
|
* inodes so everything is OK. |
|
*/ |
|
inode = ext2_iget(sb, ino); |
|
if (IS_ERR(inode)) |
|
return ERR_CAST(inode); |
|
if (generation && inode->i_generation != generation) { |
|
/* we didn't find the right inode.. */ |
|
iput(inode); |
|
return ERR_PTR(-ESTALE); |
|
} |
|
return inode; |
|
} |
|
|
|
static struct dentry *ext2_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, |
|
ext2_nfs_get_inode); |
|
} |
|
|
|
static struct dentry *ext2_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, |
|
ext2_nfs_get_inode); |
|
} |
|
|
|
static const struct export_operations ext2_export_ops = { |
|
.fh_to_dentry = ext2_fh_to_dentry, |
|
.fh_to_parent = ext2_fh_to_parent, |
|
.get_parent = ext2_get_parent, |
|
}; |
|
|
|
static unsigned long get_sb_block(void **data) |
|
{ |
|
unsigned long sb_block; |
|
char *options = (char *) *data; |
|
|
|
if (!options || strncmp(options, "sb=", 3) != 0) |
|
return 1; /* Default location */ |
|
options += 3; |
|
sb_block = simple_strtoul(options, &options, 0); |
|
if (*options && *options != ',') { |
|
printk("EXT2-fs: Invalid sb specification: %s\n", |
|
(char *) *data); |
|
return 1; |
|
} |
|
if (*options == ',') |
|
options++; |
|
*data = (void *) options; |
|
return sb_block; |
|
} |
|
|
|
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_nobh, Opt_user_xattr, Opt_nouser_xattr, |
|
Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
|
Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
|
}; |
|
|
|
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_nobh, "nobh"}, |
|
{Opt_user_xattr, "user_xattr"}, |
|
{Opt_nouser_xattr, "nouser_xattr"}, |
|
{Opt_acl, "acl"}, |
|
{Opt_noacl, "noacl"}, |
|
{Opt_xip, "xip"}, |
|
{Opt_dax, "dax"}, |
|
{Opt_grpquota, "grpquota"}, |
|
{Opt_ignore, "noquota"}, |
|
{Opt_quota, "quota"}, |
|
{Opt_usrquota, "usrquota"}, |
|
{Opt_reservation, "reservation"}, |
|
{Opt_noreservation, "noreservation"}, |
|
{Opt_err, NULL} |
|
}; |
|
|
|
static int parse_options(char *options, struct super_block *sb, |
|
struct ext2_mount_options *opts) |
|
{ |
|
char *p; |
|
substring_t args[MAX_OPT_ARGS]; |
|
int option; |
|
kuid_t uid; |
|
kgid_t gid; |
|
|
|
if (!options) |
|
return 1; |
|
|
|
while ((p = strsep (&options, ",")) != NULL) { |
|
int token; |
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
case Opt_bsd_df: |
|
clear_opt (opts->s_mount_opt, MINIX_DF); |
|
break; |
|
case Opt_minix_df: |
|
set_opt (opts->s_mount_opt, MINIX_DF); |
|
break; |
|
case Opt_grpid: |
|
set_opt (opts->s_mount_opt, GRPID); |
|
break; |
|
case Opt_nogrpid: |
|
clear_opt (opts->s_mount_opt, GRPID); |
|
break; |
|
case Opt_resuid: |
|
if (match_int(&args[0], &option)) |
|
return 0; |
|
uid = make_kuid(current_user_ns(), option); |
|
if (!uid_valid(uid)) { |
|
ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); |
|
return 0; |
|
|
|
} |
|
opts->s_resuid = uid; |
|
break; |
|
case Opt_resgid: |
|
if (match_int(&args[0], &option)) |
|
return 0; |
|
gid = make_kgid(current_user_ns(), option); |
|
if (!gid_valid(gid)) { |
|
ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); |
|
return 0; |
|
} |
|
opts->s_resgid = gid; |
|
break; |
|
case Opt_sb: |
|
/* handled by get_sb_block() instead of here */ |
|
/* *sb_block = match_int(&args[0]); */ |
|
break; |
|
case Opt_err_panic: |
|
clear_opt (opts->s_mount_opt, ERRORS_CONT); |
|
clear_opt (opts->s_mount_opt, ERRORS_RO); |
|
set_opt (opts->s_mount_opt, ERRORS_PANIC); |
|
break; |
|
case Opt_err_ro: |
|
clear_opt (opts->s_mount_opt, ERRORS_CONT); |
|
clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
|
set_opt (opts->s_mount_opt, ERRORS_RO); |
|
break; |
|
case Opt_err_cont: |
|
clear_opt (opts->s_mount_opt, ERRORS_RO); |
|
clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
|
set_opt (opts->s_mount_opt, ERRORS_CONT); |
|
break; |
|
case Opt_nouid32: |
|
set_opt (opts->s_mount_opt, NO_UID32); |
|
break; |
|
case Opt_debug: |
|
set_opt (opts->s_mount_opt, DEBUG); |
|
break; |
|
case Opt_oldalloc: |
|
set_opt (opts->s_mount_opt, OLDALLOC); |
|
break; |
|
case Opt_orlov: |
|
clear_opt (opts->s_mount_opt, OLDALLOC); |
|
break; |
|
case Opt_nobh: |
|
set_opt (opts->s_mount_opt, NOBH); |
|
break; |
|
#ifdef CONFIG_EXT2_FS_XATTR |
|
case Opt_user_xattr: |
|
set_opt (opts->s_mount_opt, XATTR_USER); |
|
break; |
|
case Opt_nouser_xattr: |
|
clear_opt (opts->s_mount_opt, XATTR_USER); |
|
break; |
|
#else |
|
case Opt_user_xattr: |
|
case Opt_nouser_xattr: |
|
ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
|
"not supported"); |
|
break; |
|
#endif |
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL |
|
case Opt_acl: |
|
set_opt(opts->s_mount_opt, POSIX_ACL); |
|
break; |
|
case Opt_noacl: |
|
clear_opt(opts->s_mount_opt, POSIX_ACL); |
|
break; |
|
#else |
|
case Opt_acl: |
|
case Opt_noacl: |
|
ext2_msg(sb, KERN_INFO, |
|
"(no)acl options not supported"); |
|
break; |
|
#endif |
|
case Opt_xip: |
|
ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
|
set_opt(opts->s_mount_opt, XIP); |
|
fallthrough; |
|
case Opt_dax: |
|
#ifdef CONFIG_FS_DAX |
|
ext2_msg(sb, KERN_WARNING, |
|
"DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); |
|
set_opt(opts->s_mount_opt, DAX); |
|
#else |
|
ext2_msg(sb, KERN_INFO, "dax option not supported"); |
|
#endif |
|
break; |
|
|
|
#if defined(CONFIG_QUOTA) |
|
case Opt_quota: |
|
case Opt_usrquota: |
|
set_opt(opts->s_mount_opt, USRQUOTA); |
|
break; |
|
|
|
case Opt_grpquota: |
|
set_opt(opts->s_mount_opt, GRPQUOTA); |
|
break; |
|
#else |
|
case Opt_quota: |
|
case Opt_usrquota: |
|
case Opt_grpquota: |
|
ext2_msg(sb, KERN_INFO, |
|
"quota operations not supported"); |
|
break; |
|
#endif |
|
|
|
case Opt_reservation: |
|
set_opt(opts->s_mount_opt, RESERVATION); |
|
ext2_msg(sb, KERN_INFO, "reservations ON"); |
|
break; |
|
case Opt_noreservation: |
|
clear_opt(opts->s_mount_opt, RESERVATION); |
|
ext2_msg(sb, KERN_INFO, "reservations OFF"); |
|
break; |
|
case Opt_ignore: |
|
break; |
|
default: |
|
return 0; |
|
} |
|
} |
|
return 1; |
|
} |
|
|
|
static int ext2_setup_super (struct super_block * sb, |
|
struct ext2_super_block * es, |
|
int read_only) |
|
{ |
|
int res = 0; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: revision level too high, " |
|
"forcing read-only mode"); |
|
res = SB_RDONLY; |
|
} |
|
if (read_only) |
|
return res; |
|
if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: mounting unchecked fs, " |
|
"running e2fsck is recommended"); |
|
else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
|
ext2_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)) |
|
ext2_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) <= |
|
ktime_get_real_seconds())) |
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: checktime reached, " |
|
"running e2fsck is recommended"); |
|
if (!le16_to_cpu(es->s_max_mnt_count)) |
|
es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
|
le16_add_cpu(&es->s_mnt_count, 1); |
|
if (test_opt (sb, DEBUG)) |
|
ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
|
"bpg=%lu, ipg=%lu, mo=%04lx]", |
|
EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
|
sbi->s_frag_size, |
|
sbi->s_groups_count, |
|
EXT2_BLOCKS_PER_GROUP(sb), |
|
EXT2_INODES_PER_GROUP(sb), |
|
sbi->s_mount_opt); |
|
return res; |
|
} |
|
|
|
static int ext2_check_descriptors(struct super_block *sb) |
|
{ |
|
int i; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
|
|
ext2_debug ("Checking group descriptors"); |
|
|
|
for (i = 0; i < sbi->s_groups_count; i++) { |
|
struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); |
|
ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
|
ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); |
|
|
|
if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
|
le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
|
{ |
|
ext2_error (sb, "ext2_check_descriptors", |
|
"Block bitmap for group %d" |
|
" not in group (block %lu)!", |
|
i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
|
return 0; |
|
} |
|
if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
|
le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
|
{ |
|
ext2_error (sb, "ext2_check_descriptors", |
|
"Inode bitmap for group %d" |
|
" not in group (block %lu)!", |
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
|
return 0; |
|
} |
|
if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
|
le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
|
last_block) |
|
{ |
|
ext2_error (sb, "ext2_check_descriptors", |
|
"Inode table for group %d" |
|
" not in group (block %lu)!", |
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
|
return 0; |
|
} |
|
} |
|
return 1; |
|
} |
|
|
|
/* |
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect |
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
|
* We need to be 1 filesystem block less than the 2^32 sector limit. |
|
*/ |
|
static loff_t ext2_max_size(int bits) |
|
{ |
|
loff_t res = EXT2_NDIR_BLOCKS; |
|
int meta_blocks; |
|
unsigned int upper_limit; |
|
unsigned int ppb = 1 << (bits-2); |
|
|
|
/* This is calculated to be the largest file size for a |
|
* dense, file such that the total number of |
|
* sectors in the file, including data and all indirect blocks, |
|
* does not exceed 2^32 -1 |
|
* __u32 i_blocks representing the total number of |
|
* 512 bytes blocks of the file |
|
*/ |
|
upper_limit = (1LL << 32) - 1; |
|
|
|
/* total blocks in file system block size */ |
|
upper_limit >>= (bits - 9); |
|
|
|
/* Compute how many blocks we can address by block tree */ |
|
res += 1LL << (bits-2); |
|
res += 1LL << (2*(bits-2)); |
|
res += 1LL << (3*(bits-2)); |
|
/* Does block tree limit file size? */ |
|
if (res < upper_limit) |
|
goto check_lfs; |
|
|
|
res = upper_limit; |
|
/* How many metadata blocks are needed for addressing upper_limit? */ |
|
upper_limit -= EXT2_NDIR_BLOCKS; |
|
/* indirect blocks */ |
|
meta_blocks = 1; |
|
upper_limit -= ppb; |
|
/* double indirect blocks */ |
|
if (upper_limit < ppb * ppb) { |
|
meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); |
|
res -= meta_blocks; |
|
goto check_lfs; |
|
} |
|
meta_blocks += 1 + ppb; |
|
upper_limit -= ppb * ppb; |
|
/* tripple indirect blocks for the rest */ |
|
meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + |
|
DIV_ROUND_UP(upper_limit, ppb*ppb); |
|
res -= meta_blocks; |
|
check_lfs: |
|
res <<= bits; |
|
if (res > MAX_LFS_FILESIZE) |
|
res = MAX_LFS_FILESIZE; |
|
|
|
return res; |
|
} |
|
|
|
static unsigned long descriptor_loc(struct super_block *sb, |
|
unsigned long logic_sb_block, |
|
int nr) |
|
{ |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
unsigned long bg, first_meta_bg; |
|
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
|
|
|
if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
|
nr < first_meta_bg) |
|
return (logic_sb_block + nr + 1); |
|
bg = sbi->s_desc_per_block * nr; |
|
|
|
return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); |
|
} |
|
|
|
static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
|
{ |
|
struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
|
struct buffer_head * bh; |
|
struct ext2_sb_info * sbi; |
|
struct ext2_super_block * es; |
|
struct inode *root; |
|
unsigned long block; |
|
unsigned long sb_block = get_sb_block(&data); |
|
unsigned long logic_sb_block; |
|
unsigned long offset = 0; |
|
unsigned long def_mount_opts; |
|
long ret = -ENOMEM; |
|
int blocksize = BLOCK_SIZE; |
|
int db_count; |
|
int i, j; |
|
__le32 features; |
|
int err; |
|
struct ext2_mount_options opts; |
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
|
if (!sbi) |
|
goto failed; |
|
|
|
sbi->s_blockgroup_lock = |
|
kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
|
if (!sbi->s_blockgroup_lock) { |
|
kfree(sbi); |
|
goto failed; |
|
} |
|
sb->s_fs_info = sbi; |
|
sbi->s_sb_block = sb_block; |
|
sbi->s_daxdev = dax_dev; |
|
|
|
spin_lock_init(&sbi->s_lock); |
|
ret = -EINVAL; |
|
|
|
/* |
|
* See what the current blocksize for the device is, and |
|
* use that as the blocksize. Otherwise (or if the blocksize |
|
* is smaller than the default) use the default. |
|
* This is important for devices that have a hardware |
|
* sectorsize that is larger than the default. |
|
*/ |
|
blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
|
if (!blocksize) { |
|
ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
|
goto failed_sbi; |
|
} |
|
|
|
/* |
|
* If the superblock doesn't start on a hardware sector boundary, |
|
* calculate the offset. |
|
*/ |
|
if (blocksize != BLOCK_SIZE) { |
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
|
offset = (sb_block*BLOCK_SIZE) % blocksize; |
|
} else { |
|
logic_sb_block = sb_block; |
|
} |
|
|
|
if (!(bh = sb_bread(sb, logic_sb_block))) { |
|
ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
|
goto failed_sbi; |
|
} |
|
/* |
|
* Note: s_es must be initialized as soon as possible because |
|
* some ext2 macro-instructions depend on its value |
|
*/ |
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
|
sbi->s_es = es; |
|
sb->s_magic = le16_to_cpu(es->s_magic); |
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC) |
|
goto cantfind_ext2; |
|
|
|
opts.s_mount_opt = 0; |
|
/* Set defaults before we parse the mount options */ |
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
|
if (def_mount_opts & EXT2_DEFM_DEBUG) |
|
set_opt(opts.s_mount_opt, DEBUG); |
|
if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
|
set_opt(opts.s_mount_opt, GRPID); |
|
if (def_mount_opts & EXT2_DEFM_UID16) |
|
set_opt(opts.s_mount_opt, NO_UID32); |
|
#ifdef CONFIG_EXT2_FS_XATTR |
|
if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
|
set_opt(opts.s_mount_opt, XATTR_USER); |
|
#endif |
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL |
|
if (def_mount_opts & EXT2_DEFM_ACL) |
|
set_opt(opts.s_mount_opt, POSIX_ACL); |
|
#endif |
|
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
|
set_opt(opts.s_mount_opt, ERRORS_PANIC); |
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
|
set_opt(opts.s_mount_opt, ERRORS_CONT); |
|
else |
|
set_opt(opts.s_mount_opt, ERRORS_RO); |
|
|
|
opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
|
opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); |
|
|
|
set_opt(opts.s_mount_opt, RESERVATION); |
|
|
|
if (!parse_options((char *) data, sb, &opts)) |
|
goto failed_mount; |
|
|
|
sbi->s_mount_opt = opts.s_mount_opt; |
|
sbi->s_resuid = opts.s_resuid; |
|
sbi->s_resgid = opts.s_resgid; |
|
|
|
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
|
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
|
sb->s_iflags |= SB_I_CGROUPWB; |
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
|
(EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
|
EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
|
EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: feature flags set on rev 0 fs, " |
|
"running e2fsck is recommended"); |
|
/* |
|
* Check feature flags regardless of the revision level, since we |
|
* previously didn't change the revision level when setting the flags, |
|
* so there is a chance incompat flags are set on a rev 0 filesystem. |
|
*/ |
|
features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
|
if (features) { |
|
ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
|
"unsupported optional features (%x)", |
|
le32_to_cpu(features)); |
|
goto failed_mount; |
|
} |
|
if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
|
ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
|
"unsupported optional features (%x)", |
|
le32_to_cpu(features)); |
|
goto failed_mount; |
|
} |
|
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
|
|
|
if (test_opt(sb, DAX)) { |
|
if (!bdev_dax_supported(sb->s_bdev, blocksize)) { |
|
ext2_msg(sb, KERN_ERR, |
|
"DAX unsupported by block device. Turning off DAX."); |
|
clear_opt(sbi->s_mount_opt, DAX); |
|
} |
|
} |
|
|
|
/* If the blocksize doesn't match, re-read the thing.. */ |
|
if (sb->s_blocksize != blocksize) { |
|
brelse(bh); |
|
|
|
if (!sb_set_blocksize(sb, blocksize)) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: bad blocksize %d", blocksize); |
|
goto failed_sbi; |
|
} |
|
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
|
offset = (sb_block*BLOCK_SIZE) % blocksize; |
|
bh = sb_bread(sb, logic_sb_block); |
|
if(!bh) { |
|
ext2_msg(sb, KERN_ERR, "error: couldn't read" |
|
"superblock on 2nd try"); |
|
goto failed_sbi; |
|
} |
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
|
sbi->s_es = es; |
|
if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
|
ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
|
goto failed_mount; |
|
} |
|
} |
|
|
|
sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
|
sb->s_max_links = EXT2_LINK_MAX; |
|
sb->s_time_min = S32_MIN; |
|
sb->s_time_max = S32_MAX; |
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
|
sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
|
sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
|
} else { |
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
|
if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
|
!is_power_of_2(sbi->s_inode_size) || |
|
(sbi->s_inode_size > blocksize)) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: unsupported inode size: %d", |
|
sbi->s_inode_size); |
|
goto failed_mount; |
|
} |
|
} |
|
|
|
sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << |
|
le32_to_cpu(es->s_log_frag_size); |
|
if (sbi->s_frag_size == 0) |
|
goto cantfind_ext2; |
|
sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; |
|
|
|
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
|
sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
|
|
|
sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
|
if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
|
goto cantfind_ext2; |
|
sbi->s_itb_per_group = sbi->s_inodes_per_group / |
|
sbi->s_inodes_per_block; |
|
sbi->s_desc_per_block = sb->s_blocksize / |
|
sizeof (struct ext2_group_desc); |
|
sbi->s_sbh = bh; |
|
sbi->s_mount_state = le16_to_cpu(es->s_state); |
|
sbi->s_addr_per_block_bits = |
|
ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
|
sbi->s_desc_per_block_bits = |
|
ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC) |
|
goto cantfind_ext2; |
|
|
|
if (sb->s_blocksize != bh->b_size) { |
|
if (!silent) |
|
ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
|
goto failed_mount; |
|
} |
|
|
|
if (sb->s_blocksize != sbi->s_frag_size) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: fragsize %lu != blocksize %lu" |
|
"(not supported yet)", |
|
sbi->s_frag_size, sb->s_blocksize); |
|
goto failed_mount; |
|
} |
|
|
|
if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: #blocks per group too big: %lu", |
|
sbi->s_blocks_per_group); |
|
goto failed_mount; |
|
} |
|
if (sbi->s_frags_per_group > sb->s_blocksize * 8) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: #fragments per group too big: %lu", |
|
sbi->s_frags_per_group); |
|
goto failed_mount; |
|
} |
|
if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
|
ext2_msg(sb, KERN_ERR, |
|
"error: #inodes per group too big: %lu", |
|
sbi->s_inodes_per_group); |
|
goto failed_mount; |
|
} |
|
|
|
if (EXT2_BLOCKS_PER_GROUP(sb) == 0) |
|
goto cantfind_ext2; |
|
sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
|
le32_to_cpu(es->s_first_data_block) - 1) |
|
/ EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
|
db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
|
EXT2_DESC_PER_BLOCK(sb); |
|
sbi->s_group_desc = kmalloc_array(db_count, |
|
sizeof(struct buffer_head *), |
|
GFP_KERNEL); |
|
if (sbi->s_group_desc == NULL) { |
|
ret = -ENOMEM; |
|
ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
|
goto failed_mount; |
|
} |
|
bgl_lock_init(sbi->s_blockgroup_lock); |
|
sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
|
if (!sbi->s_debts) { |
|
ret = -ENOMEM; |
|
ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
|
goto failed_mount_group_desc; |
|
} |
|
for (i = 0; i < db_count; i++) { |
|
block = descriptor_loc(sb, logic_sb_block, i); |
|
sbi->s_group_desc[i] = sb_bread(sb, block); |
|
if (!sbi->s_group_desc[i]) { |
|
for (j = 0; j < i; j++) |
|
brelse (sbi->s_group_desc[j]); |
|
ext2_msg(sb, KERN_ERR, |
|
"error: unable to read group descriptors"); |
|
goto failed_mount_group_desc; |
|
} |
|
} |
|
if (!ext2_check_descriptors (sb)) { |
|
ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
|
goto failed_mount2; |
|
} |
|
sbi->s_gdb_count = db_count; |
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
|
spin_lock_init(&sbi->s_next_gen_lock); |
|
|
|
/* per fileystem reservation list head & lock */ |
|
spin_lock_init(&sbi->s_rsv_window_lock); |
|
sbi->s_rsv_window_root = RB_ROOT; |
|
/* |
|
* Add a single, static dummy reservation to the start of the |
|
* reservation window list --- it gives us a placeholder for |
|
* append-at-start-of-list which makes the allocation logic |
|
* _much_ simpler. |
|
*/ |
|
sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
|
sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
|
sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
|
sbi->s_rsv_window_head.rsv_goal_size = 0; |
|
ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); |
|
|
|
err = percpu_counter_init(&sbi->s_freeblocks_counter, |
|
ext2_count_free_blocks(sb), GFP_KERNEL); |
|
if (!err) { |
|
err = percpu_counter_init(&sbi->s_freeinodes_counter, |
|
ext2_count_free_inodes(sb), GFP_KERNEL); |
|
} |
|
if (!err) { |
|
err = percpu_counter_init(&sbi->s_dirs_counter, |
|
ext2_count_dirs(sb), GFP_KERNEL); |
|
} |
|
if (err) { |
|
ret = err; |
|
ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
|
goto failed_mount3; |
|
} |
|
|
|
#ifdef CONFIG_EXT2_FS_XATTR |
|
sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
|
if (!sbi->s_ea_block_cache) { |
|
ret = -ENOMEM; |
|
ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); |
|
goto failed_mount3; |
|
} |
|
#endif |
|
/* |
|
* set up enough so that it can read an inode |
|
*/ |
|
sb->s_op = &ext2_sops; |
|
sb->s_export_op = &ext2_export_ops; |
|
sb->s_xattr = ext2_xattr_handlers; |
|
|
|
#ifdef CONFIG_QUOTA |
|
sb->dq_op = &dquot_operations; |
|
sb->s_qcop = &ext2_quotactl_ops; |
|
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
|
#endif |
|
|
|
root = ext2_iget(sb, EXT2_ROOT_INO); |
|
if (IS_ERR(root)) { |
|
ret = PTR_ERR(root); |
|
goto failed_mount3; |
|
} |
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
|
iput(root); |
|
ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
|
goto failed_mount3; |
|
} |
|
|
|
sb->s_root = d_make_root(root); |
|
if (!sb->s_root) { |
|
ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
|
ret = -ENOMEM; |
|
goto failed_mount3; |
|
} |
|
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: mounting ext3 filesystem as ext2"); |
|
if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
|
sb->s_flags |= SB_RDONLY; |
|
ext2_write_super(sb); |
|
return 0; |
|
|
|
cantfind_ext2: |
|
if (!silent) |
|
ext2_msg(sb, KERN_ERR, |
|
"error: can't find an ext2 filesystem on dev %s.", |
|
sb->s_id); |
|
goto failed_mount; |
|
failed_mount3: |
|
ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
|
percpu_counter_destroy(&sbi->s_freeblocks_counter); |
|
percpu_counter_destroy(&sbi->s_freeinodes_counter); |
|
percpu_counter_destroy(&sbi->s_dirs_counter); |
|
failed_mount2: |
|
for (i = 0; i < db_count; i++) |
|
brelse(sbi->s_group_desc[i]); |
|
failed_mount_group_desc: |
|
kfree(sbi->s_group_desc); |
|
kfree(sbi->s_debts); |
|
failed_mount: |
|
brelse(bh); |
|
failed_sbi: |
|
sb->s_fs_info = NULL; |
|
kfree(sbi->s_blockgroup_lock); |
|
kfree(sbi); |
|
failed: |
|
fs_put_dax(dax_dev); |
|
return ret; |
|
} |
|
|
|
static void ext2_clear_super_error(struct super_block *sb) |
|
{ |
|
struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; |
|
|
|
if (buffer_write_io_error(sbh)) { |
|
/* |
|
* Oh, dear. A previous attempt to write the |
|
* superblock failed. This could happen because the |
|
* USB device was yanked out. Or it could happen to |
|
* be a transient write error and maybe the block will |
|
* be remapped. Nothing we can do but to retry the |
|
* write and hope for the best. |
|
*/ |
|
ext2_msg(sb, KERN_ERR, |
|
"previous I/O error to superblock detected"); |
|
clear_buffer_write_io_error(sbh); |
|
set_buffer_uptodate(sbh); |
|
} |
|
} |
|
|
|
void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
|
int wait) |
|
{ |
|
ext2_clear_super_error(sb); |
|
spin_lock(&EXT2_SB(sb)->s_lock); |
|
es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
|
es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
|
es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
|
/* unlock before we do IO */ |
|
spin_unlock(&EXT2_SB(sb)->s_lock); |
|
mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
|
if (wait) |
|
sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
|
} |
|
|
|
/* |
|
* In the second extended file system, it is not necessary to |
|
* write the super block since we use a mapping of the |
|
* disk super block in a buffer. |
|
* |
|
* However, this function is still used to set the fs valid |
|
* flags to 0. We need to set this flag to 0 since the fs |
|
* may have been checked while mounted and e2fsck may have |
|
* set s_state to EXT2_VALID_FS after some corrections. |
|
*/ |
|
static int ext2_sync_fs(struct super_block *sb, int wait) |
|
{ |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
|
|
|
/* |
|
* Write quota structures to quota file, sync_blockdev() will write |
|
* them to disk later |
|
*/ |
|
dquot_writeback_dquots(sb, -1); |
|
|
|
spin_lock(&sbi->s_lock); |
|
if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
|
ext2_debug("setting valid to 0\n"); |
|
es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
|
} |
|
spin_unlock(&sbi->s_lock); |
|
ext2_sync_super(sb, es, wait); |
|
return 0; |
|
} |
|
|
|
static int ext2_freeze(struct super_block *sb) |
|
{ |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
|
|
/* |
|
* Open but unlinked files present? Keep EXT2_VALID_FS flag cleared |
|
* because we have unattached inodes and thus filesystem is not fully |
|
* consistent. |
|
*/ |
|
if (atomic_long_read(&sb->s_remove_count)) { |
|
ext2_sync_fs(sb, 1); |
|
return 0; |
|
} |
|
/* Set EXT2_FS_VALID flag */ |
|
spin_lock(&sbi->s_lock); |
|
sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); |
|
spin_unlock(&sbi->s_lock); |
|
ext2_sync_super(sb, sbi->s_es, 1); |
|
|
|
return 0; |
|
} |
|
|
|
static int ext2_unfreeze(struct super_block *sb) |
|
{ |
|
/* Just write sb to clear EXT2_VALID_FS flag */ |
|
ext2_write_super(sb); |
|
|
|
return 0; |
|
} |
|
|
|
static void ext2_write_super(struct super_block *sb) |
|
{ |
|
if (!sb_rdonly(sb)) |
|
ext2_sync_fs(sb, 1); |
|
} |
|
|
|
static int ext2_remount (struct super_block * sb, int * flags, char * data) |
|
{ |
|
struct ext2_sb_info * sbi = EXT2_SB(sb); |
|
struct ext2_super_block * es; |
|
struct ext2_mount_options new_opts; |
|
int err; |
|
|
|
sync_filesystem(sb); |
|
|
|
spin_lock(&sbi->s_lock); |
|
new_opts.s_mount_opt = sbi->s_mount_opt; |
|
new_opts.s_resuid = sbi->s_resuid; |
|
new_opts.s_resgid = sbi->s_resgid; |
|
spin_unlock(&sbi->s_lock); |
|
|
|
if (!parse_options(data, sb, &new_opts)) |
|
return -EINVAL; |
|
|
|
spin_lock(&sbi->s_lock); |
|
es = sbi->s_es; |
|
if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
|
ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
|
"dax flag with busy inodes while remounting"); |
|
new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
|
} |
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
|
goto out_set; |
|
if (*flags & SB_RDONLY) { |
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
|
!(sbi->s_mount_state & EXT2_VALID_FS)) |
|
goto out_set; |
|
|
|
/* |
|
* OK, we are remounting a valid rw partition rdonly, so set |
|
* the rdonly flag and then mark the partition as valid again. |
|
*/ |
|
es->s_state = cpu_to_le16(sbi->s_mount_state); |
|
es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
|
spin_unlock(&sbi->s_lock); |
|
|
|
err = dquot_suspend(sb, -1); |
|
if (err < 0) |
|
return err; |
|
|
|
ext2_sync_super(sb, es, 1); |
|
} else { |
|
__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
|
~EXT2_FEATURE_RO_COMPAT_SUPP); |
|
if (ret) { |
|
spin_unlock(&sbi->s_lock); |
|
ext2_msg(sb, KERN_WARNING, |
|
"warning: couldn't remount RDWR because of " |
|
"unsupported optional features (%x).", |
|
le32_to_cpu(ret)); |
|
return -EROFS; |
|
} |
|
/* |
|
* Mounting a RDONLY partition read-write, so reread and |
|
* store the current valid flag. (It may have been changed |
|
* by e2fsck since we originally mounted the partition.) |
|
*/ |
|
sbi->s_mount_state = le16_to_cpu(es->s_state); |
|
if (!ext2_setup_super (sb, es, 0)) |
|
sb->s_flags &= ~SB_RDONLY; |
|
spin_unlock(&sbi->s_lock); |
|
|
|
ext2_write_super(sb); |
|
|
|
dquot_resume(sb, -1); |
|
} |
|
|
|
spin_lock(&sbi->s_lock); |
|
out_set: |
|
sbi->s_mount_opt = new_opts.s_mount_opt; |
|
sbi->s_resuid = new_opts.s_resuid; |
|
sbi->s_resgid = new_opts.s_resgid; |
|
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
|
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
|
spin_unlock(&sbi->s_lock); |
|
|
|
return 0; |
|
} |
|
|
|
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
|
{ |
|
struct super_block *sb = dentry->d_sb; |
|
struct ext2_sb_info *sbi = EXT2_SB(sb); |
|
struct ext2_super_block *es = sbi->s_es; |
|
u64 fsid; |
|
|
|
spin_lock(&sbi->s_lock); |
|
|
|
if (test_opt (sb, MINIX_DF)) |
|
sbi->s_overhead_last = 0; |
|
else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
|
unsigned long i, overhead = 0; |
|
smp_rmb(); |
|
|
|
/* |
|
* Compute the overhead (FS structures). This is constant |
|
* for a given filesystem unless the number of block groups |
|
* changes so we cache the previous value until it does. |
|
*/ |
|
|
|
/* |
|
* All of the blocks before first_data_block are |
|
* overhead |
|
*/ |
|
overhead = le32_to_cpu(es->s_first_data_block); |
|
|
|
/* |
|
* Add the overhead attributed to the superblock and |
|
* block group descriptors. If the sparse superblocks |
|
* feature is turned on, then not all groups have this. |
|
*/ |
|
for (i = 0; i < sbi->s_groups_count; i++) |
|
overhead += ext2_bg_has_super(sb, i) + |
|
ext2_bg_num_gdb(sb, i); |
|
|
|
/* |
|
* Every block group has an inode bitmap, a block |
|
* bitmap, and an inode table. |
|
*/ |
|
overhead += (sbi->s_groups_count * |
|
(2 + sbi->s_itb_per_group)); |
|
sbi->s_overhead_last = overhead; |
|
smp_wmb(); |
|
sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
|
} |
|
|
|
buf->f_type = EXT2_SUPER_MAGIC; |
|
buf->f_bsize = sb->s_blocksize; |
|
buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
|
buf->f_bfree = ext2_count_free_blocks(sb); |
|
es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
|
buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
|
if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
|
buf->f_bavail = 0; |
|
buf->f_files = le32_to_cpu(es->s_inodes_count); |
|
buf->f_ffree = ext2_count_free_inodes(sb); |
|
es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
|
buf->f_namelen = EXT2_NAME_LEN; |
|
fsid = le64_to_cpup((void *)es->s_uuid) ^ |
|
le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
|
buf->f_fsid = u64_to_fsid(fsid); |
|
spin_unlock(&sbi->s_lock); |
|
return 0; |
|
} |
|
|
|
static struct dentry *ext2_mount(struct file_system_type *fs_type, |
|
int flags, const char *dev_name, void *data) |
|
{ |
|
return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
|
} |
|
|
|
#ifdef CONFIG_QUOTA |
|
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford |
|
* acquiring the locks... As quota files are never truncated and quota code |
|
* itself serializes the operations (and no one else should touch the files) |
|
* we don't have to be afraid of races */ |
|
static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
|
size_t len, loff_t off) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
|
int err = 0; |
|
int offset = off & (sb->s_blocksize - 1); |
|
int tocopy; |
|
size_t toread; |
|
struct buffer_head tmp_bh; |
|
struct buffer_head *bh; |
|
loff_t i_size = i_size_read(inode); |
|
|
|
if (off > i_size) |
|
return 0; |
|
if (off+len > i_size) |
|
len = i_size-off; |
|
toread = len; |
|
while (toread > 0) { |
|
tocopy = sb->s_blocksize - offset < toread ? |
|
sb->s_blocksize - offset : toread; |
|
|
|
tmp_bh.b_state = 0; |
|
tmp_bh.b_size = sb->s_blocksize; |
|
err = ext2_get_block(inode, blk, &tmp_bh, 0); |
|
if (err < 0) |
|
return err; |
|
if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
|
memset(data, 0, tocopy); |
|
else { |
|
bh = sb_bread(sb, tmp_bh.b_blocknr); |
|
if (!bh) |
|
return -EIO; |
|
memcpy(data, bh->b_data+offset, tocopy); |
|
brelse(bh); |
|
} |
|
offset = 0; |
|
toread -= tocopy; |
|
data += tocopy; |
|
blk++; |
|
} |
|
return len; |
|
} |
|
|
|
/* Write to quotafile */ |
|
static ssize_t ext2_quota_write(struct super_block *sb, int type, |
|
const char *data, size_t len, loff_t off) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
|
int err = 0; |
|
int offset = off & (sb->s_blocksize - 1); |
|
int tocopy; |
|
size_t towrite = len; |
|
struct buffer_head tmp_bh; |
|
struct buffer_head *bh; |
|
|
|
while (towrite > 0) { |
|
tocopy = sb->s_blocksize - offset < towrite ? |
|
sb->s_blocksize - offset : towrite; |
|
|
|
tmp_bh.b_state = 0; |
|
tmp_bh.b_size = sb->s_blocksize; |
|
err = ext2_get_block(inode, blk, &tmp_bh, 1); |
|
if (err < 0) |
|
goto out; |
|
if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
|
bh = sb_bread(sb, tmp_bh.b_blocknr); |
|
else |
|
bh = sb_getblk(sb, tmp_bh.b_blocknr); |
|
if (unlikely(!bh)) { |
|
err = -EIO; |
|
goto out; |
|
} |
|
lock_buffer(bh); |
|
memcpy(bh->b_data+offset, data, tocopy); |
|
flush_dcache_page(bh->b_page); |
|
set_buffer_uptodate(bh); |
|
mark_buffer_dirty(bh); |
|
unlock_buffer(bh); |
|
brelse(bh); |
|
offset = 0; |
|
towrite -= tocopy; |
|
data += tocopy; |
|
blk++; |
|
} |
|
out: |
|
if (len == towrite) |
|
return err; |
|
if (inode->i_size < off+len-towrite) |
|
i_size_write(inode, off+len-towrite); |
|
inode_inc_iversion(inode); |
|
inode->i_mtime = inode->i_ctime = current_time(inode); |
|
mark_inode_dirty(inode); |
|
return len - towrite; |
|
} |
|
|
|
static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
|
const struct path *path) |
|
{ |
|
int err; |
|
struct inode *inode; |
|
|
|
err = dquot_quota_on(sb, type, format_id, path); |
|
if (err) |
|
return err; |
|
|
|
inode = d_inode(path->dentry); |
|
inode_lock(inode); |
|
EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; |
|
inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, |
|
S_NOATIME | S_IMMUTABLE); |
|
inode_unlock(inode); |
|
mark_inode_dirty(inode); |
|
|
|
return 0; |
|
} |
|
|
|
static int ext2_quota_off(struct super_block *sb, int type) |
|
{ |
|
struct inode *inode = sb_dqopt(sb)->files[type]; |
|
int err; |
|
|
|
if (!inode || !igrab(inode)) |
|
goto out; |
|
|
|
err = dquot_quota_off(sb, type); |
|
if (err) |
|
goto out_put; |
|
|
|
inode_lock(inode); |
|
EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); |
|
inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); |
|
inode_unlock(inode); |
|
mark_inode_dirty(inode); |
|
out_put: |
|
iput(inode); |
|
return err; |
|
out: |
|
return dquot_quota_off(sb, type); |
|
} |
|
|
|
#endif |
|
|
|
static struct file_system_type ext2_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "ext2", |
|
.mount = ext2_mount, |
|
.kill_sb = kill_block_super, |
|
.fs_flags = FS_REQUIRES_DEV, |
|
}; |
|
MODULE_ALIAS_FS("ext2"); |
|
|
|
static int __init init_ext2_fs(void) |
|
{ |
|
int err; |
|
|
|
err = init_inodecache(); |
|
if (err) |
|
return err; |
|
err = register_filesystem(&ext2_fs_type); |
|
if (err) |
|
goto out; |
|
return 0; |
|
out: |
|
destroy_inodecache(); |
|
return err; |
|
} |
|
|
|
static void __exit exit_ext2_fs(void) |
|
{ |
|
unregister_filesystem(&ext2_fs_type); |
|
destroy_inodecache(); |
|
} |
|
|
|
MODULE_AUTHOR("Remy Card and others"); |
|
MODULE_DESCRIPTION("Second Extended Filesystem"); |
|
MODULE_LICENSE("GPL"); |
|
module_init(init_ext2_fs) |
|
module_exit(exit_ext2_fs)
|
|
|