#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/fs_context.h>
#include <linux/fs_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_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;
}
}
static void ext2_msg_fc(struct fs_context *fc, const char *prefix,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
const char *s_id;
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
s_id = fc->root->d_sb->s_id;
} else {
s_id = strrchr(fc->source, '/');
if (s_id)
s_id++;
else
s_id = fc->source;
}
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
printk("%sEXT2-fs (%s): %pV\n", prefix, s_id, &vaf);
va_end(args);
}
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);
}
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);
}
#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]);
kvfree(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, NULL);
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 = alloc_inode_sb(sb, 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);
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_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)
{
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, 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 __rcu **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,
.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);
inode = ext2_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 *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 = {
.encode_fh = generic_encode_ino32_fh,
.fh_to_dentry = ext2_fh_to_dentry,
.fh_to_parent = ext2_fh_to_parent,
.get_parent = ext2_get_parent,
};
enum {
Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, Opt_resgid, Opt_resuid,
Opt_sb, Opt_errors, Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
Opt_nobh, Opt_user_xattr, Opt_acl, Opt_xip, Opt_dax, Opt_ignore,
Opt_quota, Opt_usrquota, Opt_grpquota, Opt_reservation,
};
static const struct constant_table ext2_param_errors[] = {
{"continue", EXT2_MOUNT_ERRORS_CONT},
{"panic", EXT2_MOUNT_ERRORS_PANIC},
{"remount-ro", EXT2_MOUNT_ERRORS_RO},
{}
};
static const struct fs_parameter_spec ext2_param_spec[] = {
fsparam_flag ("bsddf", Opt_bsd_df),
fsparam_flag ("minixdf", Opt_minix_df),
fsparam_flag ("grpid", Opt_grpid),
fsparam_flag ("bsdgroups", Opt_grpid),
fsparam_flag ("nogrpid", Opt_nogrpid),
fsparam_flag ("sysvgroups", Opt_nogrpid),
fsparam_gid ("resgid", Opt_resgid),
fsparam_uid ("resuid", Opt_resuid),
fsparam_u32 ("sb", Opt_sb),
fsparam_enum ("errors", Opt_errors, ext2_param_errors),
fsparam_flag ("nouid32", Opt_nouid32),
fsparam_flag ("debug", Opt_debug),
fsparam_flag ("oldalloc", Opt_oldalloc),
fsparam_flag ("orlov", Opt_orlov),
fsparam_flag ("nobh", Opt_nobh),
fsparam_flag_no ("user_xattr", Opt_user_xattr),
fsparam_flag_no ("acl", Opt_acl),
fsparam_flag ("xip", Opt_xip),
fsparam_flag ("dax", Opt_dax),
fsparam_flag ("grpquota", Opt_grpquota),
fsparam_flag ("noquota", Opt_ignore),
fsparam_flag ("quota", Opt_quota),
fsparam_flag ("usrquota", Opt_usrquota),
fsparam_flag_no ("reservation", Opt_reservation),
{}
};
#define EXT2_SPEC_s_resuid (1 << 0)
#define EXT2_SPEC_s_resgid (1 << 1)
struct ext2_fs_context {
unsigned long vals_s_flags;
unsigned long mask_s_flags;
unsigned int vals_s_mount_opt;
unsigned int mask_s_mount_opt;
kuid_t s_resuid;
kgid_t s_resgid;
unsigned long s_sb_block;
unsigned int spec;
};
static inline void ctx_set_mount_opt(struct ext2_fs_context *ctx,
unsigned long flag)
{
ctx->mask_s_mount_opt |= flag;
ctx->vals_s_mount_opt |= flag;
}
static inline void ctx_clear_mount_opt(struct ext2_fs_context *ctx,
unsigned long flag)
{
ctx->mask_s_mount_opt |= flag;
ctx->vals_s_mount_opt &= ~flag;
}
static inline unsigned long
ctx_test_mount_opt(struct ext2_fs_context *ctx, unsigned long flag)
{
return (ctx->vals_s_mount_opt & flag);
}
static inline bool
ctx_parsed_mount_opt(struct ext2_fs_context *ctx, unsigned long flag)
{
return (ctx->mask_s_mount_opt & flag);
}
static void ext2_free_fc(struct fs_context *fc)
{
kfree(fc->fs_private);
}
static int ext2_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct ext2_fs_context *ctx = fc->fs_private;
int opt;
struct fs_parse_result result;
opt = fs_parse(fc, ext2_param_spec, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_bsd_df:
ctx_clear_mount_opt(ctx, EXT2_MOUNT_MINIX_DF);
break;
case Opt_minix_df:
ctx_set_mount_opt(ctx, EXT2_MOUNT_MINIX_DF);
break;
case Opt_grpid:
ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPID);
break;
case Opt_nogrpid:
ctx_clear_mount_opt(ctx, EXT2_MOUNT_GRPID);
break;
case Opt_resuid:
ctx->s_resuid = result.uid;
ctx->spec |= EXT2_SPEC_s_resuid;
break;
case Opt_resgid:
ctx->s_resgid = result.gid;
ctx->spec |= EXT2_SPEC_s_resgid;
break;
case Opt_sb:
ctx->s_sb_block = result.uint_32;
break;
case Opt_errors:
ctx_clear_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK);
ctx_set_mount_opt(ctx, result.uint_32);
break;
case Opt_nouid32:
ctx_set_mount_opt(ctx, EXT2_MOUNT_NO_UID32);
break;
case Opt_debug:
ctx_set_mount_opt(ctx, EXT2_MOUNT_DEBUG);
break;
case Opt_oldalloc:
ctx_set_mount_opt(ctx, EXT2_MOUNT_OLDALLOC);
break;
case Opt_orlov:
ctx_clear_mount_opt(ctx, EXT2_MOUNT_OLDALLOC);
break;
case Opt_nobh:
ext2_msg_fc(fc, KERN_INFO, "nobh option not supported\n");
break;
#ifdef CONFIG_EXT2_FS_XATTR
case Opt_user_xattr:
if (!result.negated)
ctx_set_mount_opt(ctx, EXT2_MOUNT_XATTR_USER);
else
ctx_clear_mount_opt(ctx, EXT2_MOUNT_XATTR_USER);
break;
#else
case Opt_user_xattr:
ext2_msg_fc(fc, KERN_INFO, "(no)user_xattr options not supported");
break;
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
case Opt_acl:
if (!result.negated)
ctx_set_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL);
else
ctx_clear_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL);
break;
#else
case Opt_acl:
ext2_msg_fc(fc, KERN_INFO, "(no)acl options not supported");
break;
#endif
case Opt_xip:
ext2_msg_fc(fc, KERN_INFO, "use dax instead of xip");
ctx_set_mount_opt(ctx, EXT2_MOUNT_XIP);
fallthrough;
case Opt_dax:
#ifdef CONFIG_FS_DAX
ext2_msg_fc(fc, KERN_WARNING,
"DAX enabled. Warning: DAX support in ext2 driver is deprecated"
" and will be removed at the end of 2025. Please use ext4 driver instead.");
ctx_set_mount_opt(ctx, EXT2_MOUNT_DAX);
#else
ext2_msg_fc(fc, KERN_INFO, "dax option not supported");
#endif
break;
#if defined(CONFIG_QUOTA)
case Opt_quota:
case Opt_usrquota:
ctx_set_mount_opt(ctx, EXT2_MOUNT_USRQUOTA);
break;
case Opt_grpquota:
ctx_set_mount_opt(ctx, EXT2_MOUNT_GRPQUOTA);
break;
#else
case Opt_quota:
case Opt_usrquota:
case Opt_grpquota:
ext2_msg_fc(fc, KERN_INFO, "quota operations not supported");
break;
#endif
case Opt_reservation:
if (!result.negated) {
ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
ext2_msg_fc(fc, KERN_INFO, "reservations ON");
} else {
ctx_clear_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
ext2_msg_fc(fc, KERN_INFO, "reservations OFF");
}
break;
case Opt_ignore:
break;
default:
return -EINVAL;
}
return 0;
}
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, gc=%lu, "
"bpg=%lu, ipg=%lu, mo=%04lx]",
EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
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;
}
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);
upper_limit = (1LL << 32) - 1;
upper_limit >>= (bits - 9);
res += 1LL << (bits-2);
res += 1LL << (2*(bits-2));
res += 1LL << (3*(bits-2));
meta_blocks = 1;
meta_blocks += 1 + ppb;
meta_blocks += 1 + ppb + ppb * ppb;
if (res + meta_blocks <= upper_limit)
goto check_lfs;
res = upper_limit;
upper_limit -= EXT2_NDIR_BLOCKS;
meta_blocks = 1;
upper_limit -= ppb;
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;
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 void ext2_set_options(struct fs_context *fc, struct ext2_sb_info *sbi)
{
struct ext2_fs_context *ctx = fc->fs_private;
struct ext2_super_block *es = sbi->s_es;
unsigned long def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
sbi->s_mount_opt = ctx->vals_s_mount_opt;
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_DEBUG) &&
def_mount_opts & EXT2_DEFM_DEBUG)
set_opt(sbi->s_mount_opt, DEBUG);
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_GRPID) &&
def_mount_opts & EXT2_DEFM_BSDGROUPS)
set_opt(sbi->s_mount_opt, GRPID);
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_NO_UID32) &&
def_mount_opts & EXT2_DEFM_UID16)
set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT2_FS_XATTR
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_XATTR_USER) &&
def_mount_opts & EXT2_DEFM_XATTR_USER)
set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_POSIX_ACL) &&
def_mount_opts & EXT2_DEFM_ACL)
set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
if (!ctx_parsed_mount_opt(ctx, EXT2_MOUNT_ERRORS_MASK)) {
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
set_opt(sbi->s_mount_opt, ERRORS_CONT);
else
set_opt(sbi->s_mount_opt, ERRORS_RO);
}
if (ctx->spec & EXT2_SPEC_s_resuid)
sbi->s_resuid = ctx->s_resuid;
else
sbi->s_resuid = make_kuid(&init_user_ns,
le16_to_cpu(es->s_def_resuid));
if (ctx->spec & EXT2_SPEC_s_resgid)
sbi->s_resgid = ctx->s_resgid;
else
sbi->s_resgid = make_kgid(&init_user_ns,
le16_to_cpu(es->s_def_resgid));
}
static int ext2_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct ext2_fs_context *ctx = fc->fs_private;
int silent = fc->sb_flags & SB_SILENT;
struct buffer_head * bh;
struct ext2_sb_info * sbi;
struct ext2_super_block * es;
struct inode *root;
unsigned long block;
unsigned long sb_block = ctx->s_sb_block;
unsigned long logic_sb_block;
unsigned long offset = 0;
long ret = -ENOMEM;
int blocksize = BLOCK_SIZE;
int db_count;
int i, j;
__le32 features;
int err;
sbi = kzalloc_obj(*sbi);
if (!sbi)
return -ENOMEM;
sbi->s_blockgroup_lock =
kzalloc_obj(struct blockgroup_lock);
if (!sbi->s_blockgroup_lock) {
kfree(sbi);
return -ENOMEM;
}
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off,
NULL, NULL);
spin_lock_init(&sbi->s_lock);
ret = -EINVAL;
blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
if (!blocksize) {
ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
goto failed_sbi;
}
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;
}
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;
ext2_set_options(fc, sbi);
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");
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;
}
if (le32_to_cpu(es->s_log_block_size) >
(EXT2_MAX_BLOCK_LOG_SIZE - BLOCK_SIZE_BITS)) {
ext2_msg(sb, KERN_ERR,
"Invalid log block size: %u",
le32_to_cpu(es->s_log_block_size));
goto failed_mount;
}
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
if (test_opt(sb, DAX)) {
if (!sbi->s_daxdev) {
ext2_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
clear_opt(sbi->s_mount_opt, DAX);
} else if (blocksize != PAGE_SIZE) {
ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n");
clear_opt(sbi->s_mount_opt, DAX);
}
}
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_blocks_per_group = le32_to_cpu(es->s_blocks_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 (es->s_log_frag_size != es->s_log_block_size) {
ext2_msg(sb, KERN_ERR,
"error: fragsize log %u != blocksize log %u",
le32_to_cpu(es->s_log_frag_size), sb->s_blocksize_bits);
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_blocks_per_group <= sbi->s_itb_per_group + 3) {
ext2_msg(sb, KERN_ERR,
"error: #blocks per group smaller than metadata size: %lu <= %lu",
sbi->s_blocks_per_group, sbi->s_inodes_per_group + 3);
goto failed_mount;
}
if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
sbi->s_inodes_per_group > sb->s_blocksize * 8) {
ext2_msg(sb, KERN_ERR,
"error: invalid #inodes per group: %lu",
sbi->s_inodes_per_group);
goto failed_mount;
}
if (sb_bdev_nr_blocks(sb) < le32_to_cpu(es->s_blocks_count)) {
ext2_msg(sb, KERN_ERR,
"bad geometry: block count %u exceeds size of device (%u blocks)",
le32_to_cpu(es->s_blocks_count),
(unsigned)sb_bdev_nr_blocks(sb));
goto failed_mount;
}
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;
if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group !=
le32_to_cpu(es->s_inodes_count)) {
ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu",
le32_to_cpu(es->s_inodes_count),
(u64)sbi->s_groups_count * sbi->s_inodes_per_group);
goto failed_mount;
}
db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
EXT2_DESC_PER_BLOCK(sb);
sbi->s_group_desc = kvmalloc_objs(struct buffer_head *, db_count);
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);
spin_lock_init(&sbi->s_rsv_window_lock);
sbi->s_rsv_window_root = RB_ROOT;
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
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:
kvfree(sbi->s_group_desc);
kfree(sbi->s_debts);
failed_mount:
brelse(bh);
failed_sbi:
fs_put_dax(sbi->s_daxdev, NULL);
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
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)) {
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());
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);
}
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;
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);
if (atomic_long_read(&sb->s_remove_count)) {
ext2_sync_fs(sb, 1);
return 0;
}
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)
{
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_reconfigure(struct fs_context *fc)
{
struct ext2_fs_context *ctx = fc->fs_private;
struct super_block *sb = fc->root->d_sb;
struct ext2_sb_info * sbi = EXT2_SB(sb);
struct ext2_super_block * es;
struct ext2_mount_options new_opts;
int flags = fc->sb_flags;
int err;
sync_filesystem(sb);
new_opts.s_mount_opt = ctx->vals_s_mount_opt;
new_opts.s_resuid = ctx->s_resuid;
new_opts.s_resgid = ctx->s_resgid;
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;
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;
}
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;
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();
overhead = le32_to_cpu(es->s_first_data_block);
for (i = 0; i < sbi->s_groups_count; i++)
overhead += ext2_bg_has_super(sb, i) +
ext2_bg_num_gdb(sb, i);
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;
buf->f_fsid = uuid_to_fsid(es->s_uuid);
spin_unlock(&sbi->s_lock);
return 0;
}
static int ext2_get_tree(struct fs_context *fc)
{
return get_tree_bdev(fc, ext2_fill_super);
}
#ifdef CONFIG_QUOTA
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 = min_t(size_t, 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))
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;
}
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 = min_t(size_t, 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_folio(bh->b_folio);
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_set_mtime_to_ts(inode, inode_set_ctime_current(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 const struct fs_context_operations ext2_context_ops = {
.parse_param = ext2_parse_param,
.get_tree = ext2_get_tree,
.reconfigure = ext2_reconfigure,
.free = ext2_free_fc,
};
static int ext2_init_fs_context(struct fs_context *fc)
{
struct ext2_fs_context *ctx;
ctx = kzalloc_obj(*ctx);
if (!ctx)
return -ENOMEM;
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
struct super_block *sb = fc->root->d_sb;
struct ext2_sb_info *sbi = EXT2_SB(sb);
spin_lock(&sbi->s_lock);
ctx->vals_s_mount_opt = sbi->s_mount_opt;
ctx->vals_s_flags = sb->s_flags;
ctx->s_resuid = sbi->s_resuid;
ctx->s_resgid = sbi->s_resgid;
spin_unlock(&sbi->s_lock);
} else {
ctx->s_sb_block = 1;
ctx_set_mount_opt(ctx, EXT2_MOUNT_RESERVATION);
}
fc->fs_private = ctx;
fc->ops = &ext2_context_ops;
return 0;
}
static struct file_system_type ext2_fs_type = {
.owner = THIS_MODULE,
.name = "ext2",
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
.init_fs_context = ext2_init_fs_context,
.parameters = ext2_param_spec,
};
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)
