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linux/fs/reiserfs/super.c
Jan Kara e9d4709fcc reiserfs: Fix memory leak in reiserfs_parse_options() 
When a usrjquota or grpjquota mount option is used multiple times, we
will leak memory allocated for the file name. Make sure the last setting
is used and all the previous ones are properly freed.

Reported-by: syzbot+c9e294bbe0333a6b7640@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
2020-08-28 17:11:53 +02:00

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/*
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
*
* Trivial changes by Alan Cox to add the LFS fixes
*
* Trivial Changes:
* Rights granted to Hans Reiser to redistribute under other terms providing
* he accepts all liability including but not limited to patent, fitness
* for purpose, and direct or indirect claims arising from failure to perform.
*
* NO WARRANTY
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <linux/uaccess.h>
#include "reiserfs.h"
#include "acl.h"
#include "xattr.h"
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/quotaops.h>
#include <linux/vfs.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/crc32.h>
#include <linux/seq_file.h>
struct file_system_type reiserfs_fs_type;
static const char reiserfs_3_5_magic_string[] = REISERFS_SUPER_MAGIC_STRING;
static const char reiserfs_3_6_magic_string[] = REISER2FS_SUPER_MAGIC_STRING;
static const char reiserfs_jr_magic_string[] = REISER2FS_JR_SUPER_MAGIC_STRING;
int is_reiserfs_3_5(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_3_5_magic_string,
strlen(reiserfs_3_5_magic_string));
}
int is_reiserfs_3_6(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_3_6_magic_string,
strlen(reiserfs_3_6_magic_string));
}
int is_reiserfs_jr(struct reiserfs_super_block *rs)
{
return !strncmp(rs->s_v1.s_magic, reiserfs_jr_magic_string,
strlen(reiserfs_jr_magic_string));
}
static int is_any_reiserfs_magic_string(struct reiserfs_super_block *rs)
{
return (is_reiserfs_3_5(rs) || is_reiserfs_3_6(rs) ||
is_reiserfs_jr(rs));
}
static int reiserfs_remount(struct super_block *s, int *flags, char *data);
static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf);
static int reiserfs_sync_fs(struct super_block *s, int wait)
{
struct reiserfs_transaction_handle th;
/*
* Writeback quota in non-journalled quota case - journalled quota has
* no dirty dquots
*/
dquot_writeback_dquots(s, -1);
reiserfs_write_lock(s);
if (!journal_begin(&th, s, 1))
if (!journal_end_sync(&th))
reiserfs_flush_old_commits(s);
reiserfs_write_unlock(s);
return 0;
}
static void flush_old_commits(struct work_struct *work)
{
struct reiserfs_sb_info *sbi;
struct super_block *s;
sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
s = sbi->s_journal->j_work_sb;
/*
* We need s_umount for protecting quota writeback. We have to use
* trylock as reiserfs_cancel_old_flush() may be waiting for this work
* to complete with s_umount held.
*/
if (!down_read_trylock(&s->s_umount)) {
/* Requeue work if we are not cancelling it */
spin_lock(&sbi->old_work_lock);
if (sbi->work_queued == 1)
queue_delayed_work(system_long_wq, &sbi->old_work, HZ);
spin_unlock(&sbi->old_work_lock);
return;
}
spin_lock(&sbi->old_work_lock);
/* Avoid clobbering the cancel state... */
if (sbi->work_queued == 1)
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
reiserfs_sync_fs(s, 1);
up_read(&s->s_umount);
}
void reiserfs_schedule_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
unsigned long delay;
/*
* Avoid scheduling flush when sb is being shut down. It can race
* with journal shutdown and free still queued delayed work.
*/
if (sb_rdonly(s) || !(s->s_flags & SB_ACTIVE))
return;
spin_lock(&sbi->old_work_lock);
if (!sbi->work_queued) {
delay = msecs_to_jiffies(dirty_writeback_interval * 10);
queue_delayed_work(system_long_wq, &sbi->old_work, delay);
sbi->work_queued = 1;
}
spin_unlock(&sbi->old_work_lock);
}
void reiserfs_cancel_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
spin_lock(&sbi->old_work_lock);
/* Make sure no new flushes will be queued */
sbi->work_queued = 2;
spin_unlock(&sbi->old_work_lock);
cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
}
static int reiserfs_freeze(struct super_block *s)
{
struct reiserfs_transaction_handle th;
reiserfs_cancel_old_flush(s);
reiserfs_write_lock(s);
if (!sb_rdonly(s)) {
int err = journal_begin(&th, s, 1);
if (err) {
reiserfs_block_writes(&th);
} else {
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
1);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
reiserfs_block_writes(&th);
journal_end_sync(&th);
}
}
reiserfs_write_unlock(s);
return 0;
}
static int reiserfs_unfreeze(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
reiserfs_allow_writes(s);
spin_lock(&sbi->old_work_lock);
/* Allow old_work to run again */
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
return 0;
}
extern const struct in_core_key MAX_IN_CORE_KEY;
/*
* this is used to delete "save link" when there are no items of a
* file it points to. It can either happen if unlink is completed but
* "save unlink" removal, or if file has both unlink and truncate
* pending and as unlink completes first (because key of "save link"
* protecting unlink is bigger that a key lf "save link" which
* protects truncate), so there left no items to make truncate
* completion on
*/
static int remove_save_link_only(struct super_block *s,
struct reiserfs_key *key, int oid_free)
{
struct reiserfs_transaction_handle th;
int err;
/* we are going to do one balancing */
err = journal_begin(&th, s, JOURNAL_PER_BALANCE_CNT);
if (err)
return err;
reiserfs_delete_solid_item(&th, NULL, key);
if (oid_free)
/* removals are protected by direct items */
reiserfs_release_objectid(&th, le32_to_cpu(key->k_objectid));
return journal_end(&th);
}
#ifdef CONFIG_QUOTA
static int reiserfs_quota_on_mount(struct super_block *, int);
#endif
/*
* Look for uncompleted unlinks and truncates and complete them
*
* Called with superblock write locked. If quotas are enabled, we have to
* release/retake lest we call dquot_quota_on_mount(), proceed to
* schedule_on_each_cpu() in invalidate_bdev() and deadlock waiting for the per
* cpu worklets to complete flush_async_commits() that in turn wait for the
* superblock write lock.
*/
static int finish_unfinished(struct super_block *s)
{
INITIALIZE_PATH(path);
struct cpu_key max_cpu_key, obj_key;
struct reiserfs_key save_link_key, last_inode_key;
int retval = 0;
struct item_head *ih;
struct buffer_head *bh;
int item_pos;
char *item;
int done;
struct inode *inode;
int truncate;
#ifdef CONFIG_QUOTA
int i;
int ms_active_set;
int quota_enabled[REISERFS_MAXQUOTAS];
#endif
/* compose key to look for "save" links */
max_cpu_key.version = KEY_FORMAT_3_5;
max_cpu_key.on_disk_key.k_dir_id = ~0U;
max_cpu_key.on_disk_key.k_objectid = ~0U;
set_cpu_key_k_offset(&max_cpu_key, ~0U);
max_cpu_key.key_length = 3;
memset(&last_inode_key, 0, sizeof(last_inode_key));
#ifdef CONFIG_QUOTA
/* Needed for iput() to work correctly and not trash data */
if (s->s_flags & SB_ACTIVE) {
ms_active_set = 0;
} else {
ms_active_set = 1;
s->s_flags |= SB_ACTIVE;
}
/* Turn on quotas so that they are updated correctly */
for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
quota_enabled[i] = 1;
if (REISERFS_SB(s)->s_qf_names[i]) {
int ret;
if (sb_has_quota_active(s, i)) {
quota_enabled[i] = 0;
continue;
}
reiserfs_write_unlock(s);
ret = reiserfs_quota_on_mount(s, i);
reiserfs_write_lock(s);
if (ret < 0)
reiserfs_warning(s, "reiserfs-2500",
"cannot turn on journaled "
"quota: error %d", ret);
}
}
#endif
done = 0;
REISERFS_SB(s)->s_is_unlinked_ok = 1;
while (!retval) {
int depth;
retval = search_item(s, &max_cpu_key, &path);
if (retval != ITEM_NOT_FOUND) {
reiserfs_error(s, "vs-2140",
"search_by_key returned %d", retval);
break;
}
bh = get_last_bh(&path);
item_pos = get_item_pos(&path);
if (item_pos != B_NR_ITEMS(bh)) {
reiserfs_warning(s, "vs-2060",
"wrong position found");
break;
}
item_pos--;
ih = item_head(bh, item_pos);
if (le32_to_cpu(ih->ih_key.k_dir_id) != MAX_KEY_OBJECTID)
/* there are no "save" links anymore */
break;
save_link_key = ih->ih_key;
if (is_indirect_le_ih(ih))
truncate = 1;
else
truncate = 0;
/* reiserfs_iget needs k_dirid and k_objectid only */
item = ih_item_body(bh, ih);
obj_key.on_disk_key.k_dir_id = le32_to_cpu(*(__le32 *) item);
obj_key.on_disk_key.k_objectid =
le32_to_cpu(ih->ih_key.k_objectid);
obj_key.on_disk_key.k_offset = 0;
obj_key.on_disk_key.k_type = 0;
pathrelse(&path);
inode = reiserfs_iget(s, &obj_key);
if (IS_ERR_OR_NULL(inode)) {
/*
* the unlink almost completed, it just did not
* manage to remove "save" link and release objectid
*/
reiserfs_warning(s, "vs-2180", "iget failed for %K",
&obj_key);
retval = remove_save_link_only(s, &save_link_key, 1);
continue;
}
if (!truncate && inode->i_nlink) {
/* file is not unlinked */
reiserfs_warning(s, "vs-2185",
"file %K is not unlinked",
&obj_key);
retval = remove_save_link_only(s, &save_link_key, 0);
continue;
}
depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_initialize(inode);
reiserfs_write_lock_nested(inode->i_sb, depth);
if (truncate && S_ISDIR(inode->i_mode)) {
/*
* We got a truncate request for a dir which
* is impossible. The only imaginable way is to
* execute unfinished truncate request then boot
* into old kernel, remove the file and create dir
* with the same key.
*/
reiserfs_warning(s, "green-2101",
"impossible truncate on a "
"directory %k. Please report",
INODE_PKEY(inode));
retval = remove_save_link_only(s, &save_link_key, 0);
truncate = 0;
iput(inode);
continue;
}
if (truncate) {
REISERFS_I(inode)->i_flags |=
i_link_saved_truncate_mask;
/*
* not completed truncate found. New size was
* committed together with "save" link
*/
reiserfs_info(s, "Truncating %k to %lld ..",
INODE_PKEY(inode), inode->i_size);
/* don't update modification time */
reiserfs_truncate_file(inode, 0);
retval = remove_save_link(inode, truncate);
} else {
REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
/* not completed unlink (rmdir) found */
reiserfs_info(s, "Removing %k..", INODE_PKEY(inode));
if (memcmp(&last_inode_key, INODE_PKEY(inode),
sizeof(last_inode_key))){
last_inode_key = *INODE_PKEY(inode);
/* removal gets completed in iput */
retval = 0;
} else {
reiserfs_warning(s, "super-2189", "Dead loop "
"in finish_unfinished "
"detected, just remove "
"save link\n");
retval = remove_save_link_only(s,
&save_link_key, 0);
}
}
iput(inode);
printk("done\n");
done++;
}
REISERFS_SB(s)->s_is_unlinked_ok = 0;
#ifdef CONFIG_QUOTA
/* Turn quotas off */
reiserfs_write_unlock(s);
for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
if (sb_dqopt(s)->files[i] && quota_enabled[i])
dquot_quota_off(s, i);
}
reiserfs_write_lock(s);
if (ms_active_set)
/* Restore the flag back */
s->s_flags &= ~SB_ACTIVE;
#endif
pathrelse(&path);
if (done)
reiserfs_info(s, "There were %d uncompleted unlinks/truncates. "
"Completed\n", done);
return retval;
}
/*
* to protect file being unlinked from getting lost we "safe" link files
* being unlinked. This link will be deleted in the same transaction with last
* item of file. mounting the filesystem we scan all these links and remove
* files which almost got lost
*/
void add_save_link(struct reiserfs_transaction_handle *th,
struct inode *inode, int truncate)
{
INITIALIZE_PATH(path);
int retval;
struct cpu_key key;
struct item_head ih;
__le32 link;
BUG_ON(!th->t_trans_id);
/* file can only get one "save link" of each kind */
RFALSE(truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask),
"saved link already exists for truncated inode %lx",
(long)inode->i_ino);
RFALSE(!truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask),
"saved link already exists for unlinked inode %lx",
(long)inode->i_ino);
/* setup key of "save" link */
key.version = KEY_FORMAT_3_5;
key.on_disk_key.k_dir_id = MAX_KEY_OBJECTID;
key.on_disk_key.k_objectid = inode->i_ino;
if (!truncate) {
/* unlink, rmdir, rename */
set_cpu_key_k_offset(&key, 1 + inode->i_sb->s_blocksize);
set_cpu_key_k_type(&key, TYPE_DIRECT);
/* item head of "safe" link */
make_le_item_head(&ih, &key, key.version,
1 + inode->i_sb->s_blocksize, TYPE_DIRECT,
4 /*length */ , 0xffff /*free space */ );
} else {
/* truncate */
if (S_ISDIR(inode->i_mode))
reiserfs_warning(inode->i_sb, "green-2102",
"Adding a truncate savelink for "
"a directory %k! Please report",
INODE_PKEY(inode));
set_cpu_key_k_offset(&key, 1);
set_cpu_key_k_type(&key, TYPE_INDIRECT);
/* item head of "safe" link */
make_le_item_head(&ih, &key, key.version, 1, TYPE_INDIRECT,
4 /*length */ , 0 /*free space */ );
}
key.key_length = 3;
/* look for its place in the tree */
retval = search_item(inode->i_sb, &key, &path);
if (retval != ITEM_NOT_FOUND) {
if (retval != -ENOSPC)
reiserfs_error(inode->i_sb, "vs-2100",
"search_by_key (%K) returned %d", &key,
retval);
pathrelse(&path);
return;
}
/* body of "save" link */
link = INODE_PKEY(inode)->k_dir_id;
/* put "save" link into tree, don't charge quota to anyone */
retval =
reiserfs_insert_item(th, &path, &key, &ih, NULL, (char *)&link);
if (retval) {
if (retval != -ENOSPC)
reiserfs_error(inode->i_sb, "vs-2120",
"insert_item returned %d", retval);
} else {
if (truncate)
REISERFS_I(inode)->i_flags |=
i_link_saved_truncate_mask;
else
REISERFS_I(inode)->i_flags |= i_link_saved_unlink_mask;
}
}
/* this opens transaction unlike add_save_link */
int remove_save_link(struct inode *inode, int truncate)
{
struct reiserfs_transaction_handle th;
struct reiserfs_key key;
int err;
/* we are going to do one balancing only */
err = journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT);
if (err)
return err;
/* setup key of "save" link */
key.k_dir_id = cpu_to_le32(MAX_KEY_OBJECTID);
key.k_objectid = INODE_PKEY(inode)->k_objectid;
if (!truncate) {
/* unlink, rmdir, rename */
set_le_key_k_offset(KEY_FORMAT_3_5, &key,
1 + inode->i_sb->s_blocksize);
set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_DIRECT);
} else {
/* truncate */
set_le_key_k_offset(KEY_FORMAT_3_5, &key, 1);
set_le_key_k_type(KEY_FORMAT_3_5, &key, TYPE_INDIRECT);
}
if ((truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_truncate_mask)) ||
(!truncate &&
(REISERFS_I(inode)->i_flags & i_link_saved_unlink_mask)))
/* don't take quota bytes from anywhere */
reiserfs_delete_solid_item(&th, NULL, &key);
if (!truncate) {
reiserfs_release_objectid(&th, inode->i_ino);
REISERFS_I(inode)->i_flags &= ~i_link_saved_unlink_mask;
} else
REISERFS_I(inode)->i_flags &= ~i_link_saved_truncate_mask;
return journal_end(&th);
}
static void reiserfs_kill_sb(struct super_block *s)
{
if (REISERFS_SB(s)) {
reiserfs_proc_info_done(s);
/*
* Force any pending inode evictions to occur now. Any
* inodes to be removed that have extended attributes
* associated with them need to clean them up before
* we can release the extended attribute root dentries.
* shrink_dcache_for_umount will BUG if we don't release
* those before it's called so ->put_super is too late.
*/
shrink_dcache_sb(s);
dput(REISERFS_SB(s)->xattr_root);
REISERFS_SB(s)->xattr_root = NULL;
dput(REISERFS_SB(s)->priv_root);
REISERFS_SB(s)->priv_root = NULL;
}
kill_block_super(s);
}
#ifdef CONFIG_QUOTA
static int reiserfs_quota_off(struct super_block *sb, int type);
static void reiserfs_quota_off_umount(struct super_block *s)
{
int type;
for (type = 0; type < REISERFS_MAXQUOTAS; type++)
reiserfs_quota_off(s, type);
}
#else
static inline void reiserfs_quota_off_umount(struct super_block *s)
{
}
#endif
static void reiserfs_put_super(struct super_block *s)
{
struct reiserfs_transaction_handle th;
th.t_trans_id = 0;
reiserfs_quota_off_umount(s);
reiserfs_write_lock(s);
/*
* change file system state to current state if it was mounted
* with read-write permissions
*/
if (!sb_rdonly(s)) {
if (!journal_begin(&th, s, 10)) {
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
1);
set_sb_umount_state(SB_DISK_SUPER_BLOCK(s),
REISERFS_SB(s)->s_mount_state);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
}
}
/*
* note, journal_release checks for readonly mount, and can
* decide not to do a journal_end
*/
journal_release(&th, s);
reiserfs_free_bitmap_cache(s);
brelse(SB_BUFFER_WITH_SB(s));
print_statistics(s);
if (REISERFS_SB(s)->reserved_blocks != 0) {
reiserfs_warning(s, "green-2005", "reserved blocks left %d",
REISERFS_SB(s)->reserved_blocks);
}
reiserfs_write_unlock(s);
mutex_destroy(&REISERFS_SB(s)->lock);
destroy_workqueue(REISERFS_SB(s)->commit_wq);
kfree(REISERFS_SB(s)->s_jdev);
kfree(s->s_fs_info);
s->s_fs_info = NULL;
}
static struct kmem_cache *reiserfs_inode_cachep;
static struct inode *reiserfs_alloc_inode(struct super_block *sb)
{
struct reiserfs_inode_info *ei;
ei = kmem_cache_alloc(reiserfs_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
atomic_set(&ei->openers, 0);
mutex_init(&ei->tailpack);
#ifdef CONFIG_QUOTA
memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
#endif
return &ei->vfs_inode;
}
static void reiserfs_free_inode(struct inode *inode)
{
kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
}
static void init_once(void *foo)
{
struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
INIT_LIST_HEAD(&ei->i_prealloc_list);
inode_init_once(&ei->vfs_inode);
}
static int __init init_inodecache(void)
{
reiserfs_inode_cachep = kmem_cache_create("reiser_inode_cache",
sizeof(struct
reiserfs_inode_info),
0, (SLAB_RECLAIM_ACCOUNT|
SLAB_MEM_SPREAD|
SLAB_ACCOUNT),
init_once);
if (reiserfs_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(reiserfs_inode_cachep);
}
/* we don't mark inodes dirty, we just log them */
static void reiserfs_dirty_inode(struct inode *inode, int flags)
{
struct reiserfs_transaction_handle th;
int err = 0;
if (sb_rdonly(inode->i_sb)) {
reiserfs_warning(inode->i_sb, "clm-6006",
"writing inode %lu on readonly FS",
inode->i_ino);
return;
}
reiserfs_write_lock(inode->i_sb);
/*
* this is really only used for atime updates, so they don't have
* to be included in O_SYNC or fsync
*/
err = journal_begin(&th, inode->i_sb, 1);
if (err)
goto out;
reiserfs_update_sd(&th, inode);
journal_end(&th);
out:
reiserfs_write_unlock(inode->i_sb);
}
static int reiserfs_show_options(struct seq_file *seq, struct dentry *root)
{
struct super_block *s = root->d_sb;
struct reiserfs_journal *journal = SB_JOURNAL(s);
long opts = REISERFS_SB(s)->s_mount_opt;
if (opts & (1 << REISERFS_LARGETAIL))
seq_puts(seq, ",tails=on");
else if (!(opts & (1 << REISERFS_SMALLTAIL)))
seq_puts(seq, ",notail");
/* tails=small is default so we don't show it */
if (!(opts & (1 << REISERFS_BARRIER_FLUSH)))
seq_puts(seq, ",barrier=none");
/* barrier=flush is default so we don't show it */
if (opts & (1 << REISERFS_ERROR_CONTINUE))
seq_puts(seq, ",errors=continue");
else if (opts & (1 << REISERFS_ERROR_PANIC))
seq_puts(seq, ",errors=panic");
/* errors=ro is default so we don't show it */
if (opts & (1 << REISERFS_DATA_LOG))
seq_puts(seq, ",data=journal");
else if (opts & (1 << REISERFS_DATA_WRITEBACK))
seq_puts(seq, ",data=writeback");
/* data=ordered is default so we don't show it */
if (opts & (1 << REISERFS_ATTRS))
seq_puts(seq, ",attrs");
if (opts & (1 << REISERFS_XATTRS_USER))
seq_puts(seq, ",user_xattr");
if (opts & (1 << REISERFS_EXPOSE_PRIVROOT))
seq_puts(seq, ",expose_privroot");
if (opts & (1 << REISERFS_POSIXACL))
seq_puts(seq, ",acl");
if (REISERFS_SB(s)->s_jdev)
seq_show_option(seq, "jdev", REISERFS_SB(s)->s_jdev);
if (journal->j_max_commit_age != journal->j_default_max_commit_age)
seq_printf(seq, ",commit=%d", journal->j_max_commit_age);
#ifdef CONFIG_QUOTA
if (REISERFS_SB(s)->s_qf_names[USRQUOTA])
seq_show_option(seq, "usrjquota",
REISERFS_SB(s)->s_qf_names[USRQUOTA]);
else if (opts & (1 << REISERFS_USRQUOTA))
seq_puts(seq, ",usrquota");
if (REISERFS_SB(s)->s_qf_names[GRPQUOTA])
seq_show_option(seq, "grpjquota",
REISERFS_SB(s)->s_qf_names[GRPQUOTA]);
else if (opts & (1 << REISERFS_GRPQUOTA))
seq_puts(seq, ",grpquota");
if (REISERFS_SB(s)->s_jquota_fmt) {
if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_OLD)
seq_puts(seq, ",jqfmt=vfsold");
else if (REISERFS_SB(s)->s_jquota_fmt == QFMT_VFS_V0)
seq_puts(seq, ",jqfmt=vfsv0");
}
#endif
/* Block allocator options */
if (opts & (1 << REISERFS_NO_BORDER))
seq_puts(seq, ",block-allocator=noborder");
if (opts & (1 << REISERFS_NO_UNHASHED_RELOCATION))
seq_puts(seq, ",block-allocator=no_unhashed_relocation");
if (opts & (1 << REISERFS_HASHED_RELOCATION))
seq_puts(seq, ",block-allocator=hashed_relocation");
if (opts & (1 << REISERFS_TEST4))
seq_puts(seq, ",block-allocator=test4");
show_alloc_options(seq, s);
return 0;
}
#ifdef CONFIG_QUOTA
static ssize_t reiserfs_quota_write(struct super_block *, int, const char *,
size_t, loff_t);
static ssize_t reiserfs_quota_read(struct super_block *, int, char *, size_t,
loff_t);
static struct dquot **reiserfs_get_dquots(struct inode *inode)
{
return REISERFS_I(inode)->i_dquot;
}
#endif
static const struct super_operations reiserfs_sops = {
.alloc_inode = reiserfs_alloc_inode,
.free_inode = reiserfs_free_inode,
.write_inode = reiserfs_write_inode,
.dirty_inode = reiserfs_dirty_inode,
.evict_inode = reiserfs_evict_inode,
.put_super = reiserfs_put_super,
.sync_fs = reiserfs_sync_fs,
.freeze_fs = reiserfs_freeze,
.unfreeze_fs = reiserfs_unfreeze,
.statfs = reiserfs_statfs,
.remount_fs = reiserfs_remount,
.show_options = reiserfs_show_options,
#ifdef CONFIG_QUOTA
.quota_read = reiserfs_quota_read,
.quota_write = reiserfs_quota_write,
.get_dquots = reiserfs_get_dquots,
#endif
};
#ifdef CONFIG_QUOTA
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
static int reiserfs_write_dquot(struct dquot *);
static int reiserfs_acquire_dquot(struct dquot *);
static int reiserfs_release_dquot(struct dquot *);
static int reiserfs_mark_dquot_dirty(struct dquot *);
static int reiserfs_write_info(struct super_block *, int);
static int reiserfs_quota_on(struct super_block *, int, int, const struct path *);
static const struct dquot_operations reiserfs_quota_operations = {
.write_dquot = reiserfs_write_dquot,
.acquire_dquot = reiserfs_acquire_dquot,
.release_dquot = reiserfs_release_dquot,
.mark_dirty = reiserfs_mark_dquot_dirty,
.write_info = reiserfs_write_info,
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
.get_next_id = dquot_get_next_id,
};
static const struct quotactl_ops reiserfs_qctl_operations = {
.quota_on = reiserfs_quota_on,
.quota_off = reiserfs_quota_off,
.quota_sync = dquot_quota_sync,
.get_state = dquot_get_state,
.set_info = dquot_set_dqinfo,
.get_dqblk = dquot_get_dqblk,
.set_dqblk = dquot_set_dqblk,
};
#endif
static const struct export_operations reiserfs_export_ops = {
.encode_fh = reiserfs_encode_fh,
.fh_to_dentry = reiserfs_fh_to_dentry,
.fh_to_parent = reiserfs_fh_to_parent,
.get_parent = reiserfs_get_parent,
};
/*
* this struct is used in reiserfs_getopt () for containing the value for
* those mount options that have values rather than being toggles.
*/
typedef struct {
char *value;
/*
* bitmask which is to set on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
*/
int setmask;
/*
* bitmask which is to clear on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
* This is applied BEFORE setmask
*/
int clrmask;
} arg_desc_t;
/* Set this bit in arg_required to allow empty arguments */
#define REISERFS_OPT_ALLOWEMPTY 31
/*
* this struct is used in reiserfs_getopt() for describing the
* set of reiserfs mount options
*/
typedef struct {
char *option_name;
/* 0 if argument is not required, not 0 otherwise */
int arg_required;
/* list of values accepted by an option */
const arg_desc_t *values;
/*
* bitmask which is to set on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
*/
int setmask;
/*
* bitmask which is to clear on mount_options bitmask
* when this value is found, 0 is no bits are to be changed.
* This is applied BEFORE setmask
*/
int clrmask;
} opt_desc_t;
/* possible values for -o data= */
static const arg_desc_t logging_mode[] = {
{"ordered", 1 << REISERFS_DATA_ORDERED,
(1 << REISERFS_DATA_LOG | 1 << REISERFS_DATA_WRITEBACK)},
{"journal", 1 << REISERFS_DATA_LOG,
(1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_WRITEBACK)},
{"writeback", 1 << REISERFS_DATA_WRITEBACK,
(1 << REISERFS_DATA_ORDERED | 1 << REISERFS_DATA_LOG)},
{.value = NULL}
};
/* possible values for -o barrier= */
static const arg_desc_t barrier_mode[] = {
{"none", 1 << REISERFS_BARRIER_NONE, 1 << REISERFS_BARRIER_FLUSH},
{"flush", 1 << REISERFS_BARRIER_FLUSH, 1 << REISERFS_BARRIER_NONE},
{.value = NULL}
};
/*
* possible values for "-o block-allocator=" and bits which are to be set in
* s_mount_opt of reiserfs specific part of in-core super block
*/
static const arg_desc_t balloc[] = {
{"noborder", 1 << REISERFS_NO_BORDER, 0},
{"border", 0, 1 << REISERFS_NO_BORDER},
{"no_unhashed_relocation", 1 << REISERFS_NO_UNHASHED_RELOCATION, 0},
{"hashed_relocation", 1 << REISERFS_HASHED_RELOCATION, 0},
{"test4", 1 << REISERFS_TEST4, 0},
{"notest4", 0, 1 << REISERFS_TEST4},
{NULL, 0, 0}
};
static const arg_desc_t tails[] = {
{"on", 1 << REISERFS_LARGETAIL, 1 << REISERFS_SMALLTAIL},
{"off", 0, (1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
{"small", 1 << REISERFS_SMALLTAIL, 1 << REISERFS_LARGETAIL},
{NULL, 0, 0}
};
static const arg_desc_t error_actions[] = {
{"panic", 1 << REISERFS_ERROR_PANIC,
(1 << REISERFS_ERROR_RO | 1 << REISERFS_ERROR_CONTINUE)},
{"ro-remount", 1 << REISERFS_ERROR_RO,
(1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_CONTINUE)},
#ifdef REISERFS_JOURNAL_ERROR_ALLOWS_NO_LOG
{"continue", 1 << REISERFS_ERROR_CONTINUE,
(1 << REISERFS_ERROR_PANIC | 1 << REISERFS_ERROR_RO)},
#endif
{NULL, 0, 0},
};
/*
* proceed only one option from a list *cur - string containing of mount
* options
* opts - array of options which are accepted
* opt_arg - if option is found and requires an argument and if it is specifed
* in the input - pointer to the argument is stored here
* bit_flags - if option requires to set a certain bit - it is set here
* return -1 if unknown option is found, opt->arg_required otherwise
*/
static int reiserfs_getopt(struct super_block *s, char **cur, opt_desc_t * opts,
char **opt_arg, unsigned long *bit_flags)
{
char *p;
/*
* foo=bar,
* ^ ^ ^
* | | +-- option_end
* | +-- arg_start
* +-- option_start
*/
const opt_desc_t *opt;
const arg_desc_t *arg;
p = *cur;
/* assume argument cannot contain commas */
*cur = strchr(p, ',');
if (*cur) {
*(*cur) = '\0';
(*cur)++;
}
if (!strncmp(p, "alloc=", 6)) {
/*
* Ugly special case, probably we should redo options
* parser so that it can understand several arguments for
* some options, also so that it can fill several bitfields
* with option values.
*/
if (reiserfs_parse_alloc_options(s, p + 6)) {
return -1;
} else {
return 0;
}
}
/* for every option in the list */
for (opt = opts; opt->option_name; opt++) {
if (!strncmp(p, opt->option_name, strlen(opt->option_name))) {
if (bit_flags) {
if (opt->clrmask ==
(1 << REISERFS_UNSUPPORTED_OPT))
reiserfs_warning(s, "super-6500",
"%s not supported.\n",
p);
else
*bit_flags &= ~opt->clrmask;
if (opt->setmask ==
(1 << REISERFS_UNSUPPORTED_OPT))
reiserfs_warning(s, "super-6501",
"%s not supported.\n",
p);
else
*bit_flags |= opt->setmask;
}
break;
}
}
if (!opt->option_name) {
reiserfs_warning(s, "super-6502",
"unknown mount option \"%s\"", p);
return -1;
}
p += strlen(opt->option_name);
switch (*p) {
case '=':
if (!opt->arg_required) {
reiserfs_warning(s, "super-6503",
"the option \"%s\" does not "
"require an argument\n",
opt->option_name);
return -1;
}
break;
case 0:
if (opt->arg_required) {
reiserfs_warning(s, "super-6504",
"the option \"%s\" requires an "
"argument\n", opt->option_name);
return -1;
}
break;
default:
reiserfs_warning(s, "super-6505",
"head of option \"%s\" is only correct\n",
opt->option_name);
return -1;
}
/*
* move to the argument, or to next option if argument is not
* required
*/
p++;
if (opt->arg_required
&& !(opt->arg_required & (1 << REISERFS_OPT_ALLOWEMPTY))
&& !strlen(p)) {
/* this catches "option=," if not allowed */
reiserfs_warning(s, "super-6506",
"empty argument for \"%s\"\n",
opt->option_name);
return -1;
}
if (!opt->values) {
/* *=NULLopt_arg contains pointer to argument */
*opt_arg = p;
return opt->arg_required & ~(1 << REISERFS_OPT_ALLOWEMPTY);
}
/* values possible for this option are listed in opt->values */
for (arg = opt->values; arg->value; arg++) {
if (!strcmp(p, arg->value)) {
if (bit_flags) {
*bit_flags &= ~arg->clrmask;
*bit_flags |= arg->setmask;
}
return opt->arg_required;
}
}
reiserfs_warning(s, "super-6506",
"bad value \"%s\" for option \"%s\"\n", p,
opt->option_name);
return -1;
}
/* returns 0 if something is wrong in option string, 1 - otherwise */
static int reiserfs_parse_options(struct super_block *s,
/* string given via mount's -o */
char *options,
/*
* after the parsing phase, contains the
* collection of bitflags defining what
* mount options were selected.
*/
unsigned long *mount_options,
/* strtol-ed from NNN of resize=NNN */
unsigned long *blocks,
char **jdev_name,
unsigned int *commit_max_age,
char **qf_names,
unsigned int *qfmt)
{
int c;
char *arg = NULL;
char *pos;
opt_desc_t opts[] = {
/*
* Compatibility stuff, so that -o notail for old
* setups still work
*/
{"tails",.arg_required = 't',.values = tails},
{"notail",.clrmask =
(1 << REISERFS_LARGETAIL) | (1 << REISERFS_SMALLTAIL)},
{"conv",.setmask = 1 << REISERFS_CONVERT},
{"attrs",.setmask = 1 << REISERFS_ATTRS},
{"noattrs",.clrmask = 1 << REISERFS_ATTRS},
{"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
#ifdef CONFIG_REISERFS_FS_XATTR
{"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
{"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
#else
{"user_xattr",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
{"nouser_xattr",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
#endif
#ifdef CONFIG_REISERFS_FS_POSIX_ACL
{"acl",.setmask = 1 << REISERFS_POSIXACL},
{"noacl",.clrmask = 1 << REISERFS_POSIXACL},
#else
{"acl",.setmask = 1 << REISERFS_UNSUPPORTED_OPT},
{"noacl",.clrmask = 1 << REISERFS_UNSUPPORTED_OPT},
#endif
{.option_name = "nolog"},
{"replayonly",.setmask = 1 << REPLAYONLY},
{"block-allocator",.arg_required = 'a',.values = balloc},
{"data",.arg_required = 'd',.values = logging_mode},
{"barrier",.arg_required = 'b',.values = barrier_mode},
{"resize",.arg_required = 'r',.values = NULL},
{"jdev",.arg_required = 'j',.values = NULL},
{"nolargeio",.arg_required = 'w',.values = NULL},
{"commit",.arg_required = 'c',.values = NULL},
{"usrquota",.setmask = 1 << REISERFS_USRQUOTA},
{"grpquota",.setmask = 1 << REISERFS_GRPQUOTA},
{"noquota",.clrmask = 1 << REISERFS_USRQUOTA | 1 << REISERFS_GRPQUOTA},
{"errors",.arg_required = 'e',.values = error_actions},
{"usrjquota",.arg_required =
'u' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
{"grpjquota",.arg_required =
'g' | (1 << REISERFS_OPT_ALLOWEMPTY),.values = NULL},
{"jqfmt",.arg_required = 'f',.values = NULL},
{.option_name = NULL}
};
*blocks = 0;
if (!options || !*options)
/*
* use default configuration: create tails, journaling on, no
* conversion to newest format
*/
return 1;
for (pos = options; pos;) {
c = reiserfs_getopt(s, &pos, opts, &arg, mount_options);
if (c == -1)
/* wrong option is given */
return 0;
if (c == 'r') {
char *p;
p = NULL;
/* "resize=NNN" or "resize=auto" */
if (!strcmp(arg, "auto")) {
/* From JFS code, to auto-get the size. */
*blocks =
i_size_read(s->s_bdev->bd_inode) >> s->
s_blocksize_bits;
} else {
*blocks = simple_strtoul(arg, &p, 0);
if (*p != '\0') {
/* NNN does not look like a number */
reiserfs_warning(s, "super-6507",
"bad value %s for "
"-oresize\n", arg);
return 0;
}
}
}
if (c == 'c') {
char *p = NULL;
unsigned long val = simple_strtoul(arg, &p, 0);
/* commit=NNN (time in seconds) */
if (*p != '\0' || val >= (unsigned int)-1) {
reiserfs_warning(s, "super-6508",
"bad value %s for -ocommit\n",
arg);
return 0;
}
*commit_max_age = (unsigned int)val;
}
if (c == 'w') {
reiserfs_warning(s, "super-6509", "nolargeio option "
"is no longer supported");
return 0;
}
if (c == 'j') {
if (arg && *arg && jdev_name) {
/* Hm, already assigned? */
if (*jdev_name) {
reiserfs_warning(s, "super-6510",
"journal device was "
"already specified to "
"be %s", *jdev_name);
return 0;
}
*jdev_name = arg;
}
}
#ifdef CONFIG_QUOTA
if (c == 'u' || c == 'g') {
int qtype = c == 'u' ? USRQUOTA : GRPQUOTA;
if (sb_any_quota_loaded(s) &&
(!*arg != !REISERFS_SB(s)->s_qf_names[qtype])) {
reiserfs_warning(s, "super-6511",
"cannot change journaled "
"quota options when quota "
"turned on.");
return 0;
}
if (qf_names[qtype] !=
REISERFS_SB(s)->s_qf_names[qtype])
kfree(qf_names[qtype]);
qf_names[qtype] = NULL;
if (*arg) { /* Some filename specified? */
if (REISERFS_SB(s)->s_qf_names[qtype]
&& strcmp(REISERFS_SB(s)->s_qf_names[qtype],
arg)) {
reiserfs_warning(s, "super-6512",
"%s quota file "
"already specified.",
QTYPE2NAME(qtype));
return 0;
}
if (strchr(arg, '/')) {
reiserfs_warning(s, "super-6513",
"quotafile must be "
"on filesystem root.");
return 0;
}
qf_names[qtype] = kstrdup(arg, GFP_KERNEL);
if (!qf_names[qtype]) {
reiserfs_warning(s, "reiserfs-2502",
"not enough memory "
"for storing "
"quotafile name.");
return 0;
}
if (qtype == USRQUOTA)
*mount_options |= 1 << REISERFS_USRQUOTA;
else
*mount_options |= 1 << REISERFS_GRPQUOTA;
} else {
if (qtype == USRQUOTA)
*mount_options &= ~(1 << REISERFS_USRQUOTA);
else
*mount_options &= ~(1 << REISERFS_GRPQUOTA);
}
}
if (c == 'f') {
if (!strcmp(arg, "vfsold"))
*qfmt = QFMT_VFS_OLD;
else if (!strcmp(arg, "vfsv0"))
*qfmt = QFMT_VFS_V0;
else {
reiserfs_warning(s, "super-6514",
"unknown quota format "
"specified.");
return 0;
}
if (sb_any_quota_loaded(s) &&
*qfmt != REISERFS_SB(s)->s_jquota_fmt) {
reiserfs_warning(s, "super-6515",
"cannot change journaled "
"quota options when quota "
"turned on.");
return 0;
}
}
#else
if (c == 'u' || c == 'g' || c == 'f') {
reiserfs_warning(s, "reiserfs-2503", "journaled "
"quota options not supported.");
return 0;
}
#endif
}
#ifdef CONFIG_QUOTA
if (!REISERFS_SB(s)->s_jquota_fmt && !*qfmt
&& (qf_names[USRQUOTA] || qf_names[GRPQUOTA])) {
reiserfs_warning(s, "super-6515",
"journaled quota format not specified.");
return 0;
}
if ((!(*mount_options & (1 << REISERFS_USRQUOTA)) &&
sb_has_quota_loaded(s, USRQUOTA)) ||
(!(*mount_options & (1 << REISERFS_GRPQUOTA)) &&
sb_has_quota_loaded(s, GRPQUOTA))) {
reiserfs_warning(s, "super-6516", "quota options must "
"be present when quota is turned on.");
return 0;
}
#endif
return 1;
}
static void switch_data_mode(struct super_block *s, unsigned long mode)
{
REISERFS_SB(s)->s_mount_opt &= ~((1 << REISERFS_DATA_LOG) |
(1 << REISERFS_DATA_ORDERED) |
(1 << REISERFS_DATA_WRITEBACK));
REISERFS_SB(s)->s_mount_opt |= (1 << mode);
}
static void handle_data_mode(struct super_block *s, unsigned long mount_options)
{
if (mount_options & (1 << REISERFS_DATA_LOG)) {
if (!reiserfs_data_log(s)) {
switch_data_mode(s, REISERFS_DATA_LOG);
reiserfs_info(s, "switching to journaled data mode\n");
}
} else if (mount_options & (1 << REISERFS_DATA_ORDERED)) {
if (!reiserfs_data_ordered(s)) {
switch_data_mode(s, REISERFS_DATA_ORDERED);
reiserfs_info(s, "switching to ordered data mode\n");
}
} else if (mount_options & (1 << REISERFS_DATA_WRITEBACK)) {
if (!reiserfs_data_writeback(s)) {
switch_data_mode(s, REISERFS_DATA_WRITEBACK);
reiserfs_info(s, "switching to writeback data mode\n");
}
}
}
static void handle_barrier_mode(struct super_block *s, unsigned long bits)
{
int flush = (1 << REISERFS_BARRIER_FLUSH);
int none = (1 << REISERFS_BARRIER_NONE);
int all_barrier = flush | none;
if (bits & all_barrier) {
REISERFS_SB(s)->s_mount_opt &= ~all_barrier;
if (bits & flush) {
REISERFS_SB(s)->s_mount_opt |= flush;
printk("reiserfs: enabling write barrier flush mode\n");
} else if (bits & none) {
REISERFS_SB(s)->s_mount_opt |= none;
printk("reiserfs: write barriers turned off\n");
}
}
}
static void handle_attrs(struct super_block *s)
{
struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(s);
if (reiserfs_attrs(s)) {
if (old_format_only(s)) {
reiserfs_warning(s, "super-6517", "cannot support "
"attributes on 3.5.x disk format");
REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
return;
}
if (!(le32_to_cpu(rs->s_flags) & reiserfs_attrs_cleared)) {
reiserfs_warning(s, "super-6518", "cannot support "
"attributes until flag is set in "
"super-block");
REISERFS_SB(s)->s_mount_opt &= ~(1 << REISERFS_ATTRS);
}
}
}
#ifdef CONFIG_QUOTA
static void handle_quota_files(struct super_block *s, char **qf_names,
unsigned int *qfmt)
{
int i;
for (i = 0; i < REISERFS_MAXQUOTAS; i++) {
if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
kfree(REISERFS_SB(s)->s_qf_names[i]);
REISERFS_SB(s)->s_qf_names[i] = qf_names[i];
}
if (*qfmt)
REISERFS_SB(s)->s_jquota_fmt = *qfmt;
}
#endif
static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
{
struct reiserfs_super_block *rs;
struct reiserfs_transaction_handle th;
unsigned long blocks;
unsigned long mount_options = REISERFS_SB(s)->s_mount_opt;
unsigned long safe_mask = 0;
unsigned int commit_max_age = (unsigned int)-1;
struct reiserfs_journal *journal = SB_JOURNAL(s);
char *new_opts;
int err;
char *qf_names[REISERFS_MAXQUOTAS];
unsigned int qfmt = 0;
#ifdef CONFIG_QUOTA
int i;
#endif
new_opts = kstrdup(arg, GFP_KERNEL);
if (arg && !new_opts)
return -ENOMEM;
sync_filesystem(s);
reiserfs_write_lock(s);
#ifdef CONFIG_QUOTA
memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names));
#endif
rs = SB_DISK_SUPER_BLOCK(s);
if (!reiserfs_parse_options
(s, arg, &mount_options, &blocks, NULL, &commit_max_age,
qf_names, &qfmt)) {
#ifdef CONFIG_QUOTA
for (i = 0; i < REISERFS_MAXQUOTAS; i++)
if (qf_names[i] != REISERFS_SB(s)->s_qf_names[i])
kfree(qf_names[i]);
#endif
err = -EINVAL;
goto out_err_unlock;
}
#ifdef CONFIG_QUOTA
handle_quota_files(s, qf_names, &qfmt);
#endif
handle_attrs(s);
/* Add options that are safe here */
safe_mask |= 1 << REISERFS_SMALLTAIL;
safe_mask |= 1 << REISERFS_LARGETAIL;
safe_mask |= 1 << REISERFS_NO_BORDER;
safe_mask |= 1 << REISERFS_NO_UNHASHED_RELOCATION;
safe_mask |= 1 << REISERFS_HASHED_RELOCATION;
safe_mask |= 1 << REISERFS_TEST4;
safe_mask |= 1 << REISERFS_ATTRS;
safe_mask |= 1 << REISERFS_XATTRS_USER;
safe_mask |= 1 << REISERFS_POSIXACL;
safe_mask |= 1 << REISERFS_BARRIER_FLUSH;
safe_mask |= 1 << REISERFS_BARRIER_NONE;
safe_mask |= 1 << REISERFS_ERROR_RO;
safe_mask |= 1 << REISERFS_ERROR_CONTINUE;
safe_mask |= 1 << REISERFS_ERROR_PANIC;
safe_mask |= 1 << REISERFS_USRQUOTA;
safe_mask |= 1 << REISERFS_GRPQUOTA;
/*
* Update the bitmask, taking care to keep
* the bits we're not allowed to change here
*/
REISERFS_SB(s)->s_mount_opt =
(REISERFS_SB(s)->
s_mount_opt & ~safe_mask) | (mount_options & safe_mask);
if (commit_max_age != 0 && commit_max_age != (unsigned int)-1) {
journal->j_max_commit_age = commit_max_age;
journal->j_max_trans_age = commit_max_age;
} else if (commit_max_age == 0) {
/* 0 means restore defaults. */
journal->j_max_commit_age = journal->j_default_max_commit_age;
journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
}
if (blocks) {
err = reiserfs_resize(s, blocks);
if (err != 0)
goto out_err_unlock;
}
if (*mount_flags & SB_RDONLY) {
reiserfs_write_unlock(s);
reiserfs_xattr_init(s, *mount_flags);
/* remount read-only */
if (sb_rdonly(s))
/* it is read-only already */
goto out_ok_unlocked;
err = dquot_suspend(s, -1);
if (err < 0)
goto out_err;
/* try to remount file system with read-only permissions */
if (sb_umount_state(rs) == REISERFS_VALID_FS
|| REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
goto out_ok_unlocked;
}
reiserfs_write_lock(s);
err = journal_begin(&th, s, 10);
if (err)
goto out_err_unlock;
/* Mounting a rw partition read-only. */
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
set_sb_umount_state(rs, REISERFS_SB(s)->s_mount_state);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
} else {
/* remount read-write */
if (!sb_rdonly(s)) {
reiserfs_write_unlock(s);
reiserfs_xattr_init(s, *mount_flags);
goto out_ok_unlocked; /* We are read-write already */
}
if (reiserfs_is_journal_aborted(journal)) {
err = journal->j_errno;
goto out_err_unlock;
}
handle_data_mode(s, mount_options);
handle_barrier_mode(s, mount_options);
REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
/* now it is safe to call journal_begin */
s->s_flags &= ~SB_RDONLY;
err = journal_begin(&th, s, 10);
if (err)
goto out_err_unlock;
/* Mount a partition which is read-only, read-write */
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
REISERFS_SB(s)->s_mount_state = sb_umount_state(rs);
s->s_flags &= ~SB_RDONLY;
set_sb_umount_state(rs, REISERFS_ERROR_FS);
if (!old_format_only(s))
set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
/* mark_buffer_dirty (SB_BUFFER_WITH_SB (s), 1); */
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
REISERFS_SB(s)->s_mount_state = REISERFS_VALID_FS;
}
/* this will force a full flush of all journal lists */
SB_JOURNAL(s)->j_must_wait = 1;
err = journal_end(&th);
if (err)
goto out_err_unlock;
reiserfs_write_unlock(s);
if (!(*mount_flags & SB_RDONLY)) {
dquot_resume(s, -1);
reiserfs_write_lock(s);
finish_unfinished(s);
reiserfs_write_unlock(s);
reiserfs_xattr_init(s, *mount_flags);
}
out_ok_unlocked:
return 0;
out_err_unlock:
reiserfs_write_unlock(s);
out_err:
kfree(new_opts);
return err;
}
static int read_super_block(struct super_block *s, int offset)
{
struct buffer_head *bh;
struct reiserfs_super_block *rs;
int fs_blocksize;
bh = sb_bread(s, offset / s->s_blocksize);
if (!bh) {
reiserfs_warning(s, "sh-2006",
"bread failed (dev %s, block %lu, size %lu)",
s->s_id, offset / s->s_blocksize,
s->s_blocksize);
return 1;
}
rs = (struct reiserfs_super_block *)bh->b_data;
if (!is_any_reiserfs_magic_string(rs)) {
brelse(bh);
return 1;
}
/*
* ok, reiserfs signature (old or new) found in at the given offset
*/
fs_blocksize = sb_blocksize(rs);
brelse(bh);
sb_set_blocksize(s, fs_blocksize);
bh = sb_bread(s, offset / s->s_blocksize);
if (!bh) {
reiserfs_warning(s, "sh-2007",
"bread failed (dev %s, block %lu, size %lu)",
s->s_id, offset / s->s_blocksize,
s->s_blocksize);
return 1;
}
rs = (struct reiserfs_super_block *)bh->b_data;
if (sb_blocksize(rs) != s->s_blocksize) {
reiserfs_warning(s, "sh-2011", "can't find a reiserfs "
"filesystem on (dev %s, block %llu, size %lu)",
s->s_id,
(unsigned long long)bh->b_blocknr,
s->s_blocksize);
brelse(bh);
return 1;
}
if (rs->s_v1.s_root_block == cpu_to_le32(-1)) {
brelse(bh);
reiserfs_warning(s, "super-6519", "Unfinished reiserfsck "
"--rebuild-tree run detected. Please run\n"
"reiserfsck --rebuild-tree and wait for a "
"completion. If that fails\n"
"get newer reiserfsprogs package");
return 1;
}
SB_BUFFER_WITH_SB(s) = bh;
SB_DISK_SUPER_BLOCK(s) = rs;
/*
* magic is of non-standard journal filesystem, look at s_version to
* find which format is in use
*/
if (is_reiserfs_jr(rs)) {
if (sb_version(rs) == REISERFS_VERSION_2)
reiserfs_info(s, "found reiserfs format \"3.6\""
" with non-standard journal\n");
else if (sb_version(rs) == REISERFS_VERSION_1)
reiserfs_info(s, "found reiserfs format \"3.5\""
" with non-standard journal\n");
else {
reiserfs_warning(s, "sh-2012", "found unknown "
"format \"%u\" of reiserfs with "
"non-standard magic", sb_version(rs));
return 1;
}
} else
/*
* s_version of standard format may contain incorrect
* information, so we just look at the magic string
*/
reiserfs_info(s,
"found reiserfs format \"%s\" with standard journal\n",
is_reiserfs_3_5(rs) ? "3.5" : "3.6");
s->s_op = &reiserfs_sops;
s->s_export_op = &reiserfs_export_ops;
#ifdef CONFIG_QUOTA
s->s_qcop = &reiserfs_qctl_operations;
s->dq_op = &reiserfs_quota_operations;
s->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
#endif
/*
* new format is limited by the 32 bit wide i_blocks field, want to
* be one full block below that.
*/
s->s_maxbytes = (512LL << 32) - s->s_blocksize;
return 0;
}
/* after journal replay, reread all bitmap and super blocks */
static int reread_meta_blocks(struct super_block *s)
{
ll_rw_block(REQ_OP_READ, 0, 1, &SB_BUFFER_WITH_SB(s));
wait_on_buffer(SB_BUFFER_WITH_SB(s));
if (!buffer_uptodate(SB_BUFFER_WITH_SB(s))) {
reiserfs_warning(s, "reiserfs-2504", "error reading the super");
return 1;
}
return 0;
}
/* hash detection stuff */
/*
* if root directory is empty - we set default - Yura's - hash and
* warn about it
* FIXME: we look for only one name in a directory. If tea and yura
* both have the same value - we ask user to send report to the
* mailing list
*/
static __u32 find_hash_out(struct super_block *s)
{
int retval;
struct inode *inode;
struct cpu_key key;
INITIALIZE_PATH(path);
struct reiserfs_dir_entry de;
struct reiserfs_de_head *deh;
__u32 hash = DEFAULT_HASH;
__u32 deh_hashval, teahash, r5hash, yurahash;
inode = d_inode(s->s_root);
make_cpu_key(&key, inode, ~0, TYPE_DIRENTRY, 3);
retval = search_by_entry_key(s, &key, &path, &de);
if (retval == IO_ERROR) {
pathrelse(&path);
return UNSET_HASH;
}
if (retval == NAME_NOT_FOUND)
de.de_entry_num--;
set_de_name_and_namelen(&de);
deh = de.de_deh + de.de_entry_num;
if (deh_offset(deh) == DOT_DOT_OFFSET) {
/* allow override in this case */
if (reiserfs_rupasov_hash(s))
hash = YURA_HASH;
reiserfs_info(s, "FS seems to be empty, autodetect is using the default hash\n");
goto out;
}
deh_hashval = GET_HASH_VALUE(deh_offset(deh));
r5hash = GET_HASH_VALUE(r5_hash(de.de_name, de.de_namelen));
teahash = GET_HASH_VALUE(keyed_hash(de.de_name, de.de_namelen));
yurahash = GET_HASH_VALUE(yura_hash(de.de_name, de.de_namelen));
if ((teahash == r5hash && deh_hashval == r5hash) ||
(teahash == yurahash && deh_hashval == yurahash) ||
(r5hash == yurahash && deh_hashval == yurahash)) {
reiserfs_warning(s, "reiserfs-2506",
"Unable to automatically detect hash "
"function. Please mount with -o "
"hash={tea,rupasov,r5}");
hash = UNSET_HASH;
goto out;
}
if (deh_hashval == yurahash)
hash = YURA_HASH;
else if (deh_hashval == teahash)
hash = TEA_HASH;
else if (deh_hashval == r5hash)
hash = R5_HASH;
else {
reiserfs_warning(s, "reiserfs-2506",
"Unrecognised hash function");
hash = UNSET_HASH;
}
out:
pathrelse(&path);
return hash;
}
/* finds out which hash names are sorted with */
static int what_hash(struct super_block *s)
{
__u32 code;
code = sb_hash_function_code(SB_DISK_SUPER_BLOCK(s));
/*
* reiserfs_hash_detect() == true if any of the hash mount options
* were used. We must check them to make sure the user isn't
* using a bad hash value
*/
if (code == UNSET_HASH || reiserfs_hash_detect(s))
code = find_hash_out(s);
if (code != UNSET_HASH && reiserfs_hash_detect(s)) {
/*
* detection has found the hash, and we must check against the
* mount options
*/
if (reiserfs_rupasov_hash(s) && code != YURA_HASH) {
reiserfs_warning(s, "reiserfs-2507",
"Error, %s hash detected, "
"unable to force rupasov hash",
reiserfs_hashname(code));
code = UNSET_HASH;
} else if (reiserfs_tea_hash(s) && code != TEA_HASH) {
reiserfs_warning(s, "reiserfs-2508",
"Error, %s hash detected, "
"unable to force tea hash",
reiserfs_hashname(code));
code = UNSET_HASH;
} else if (reiserfs_r5_hash(s) && code != R5_HASH) {
reiserfs_warning(s, "reiserfs-2509",
"Error, %s hash detected, "
"unable to force r5 hash",
reiserfs_hashname(code));
code = UNSET_HASH;
}
} else {
/*
* find_hash_out was not called or
* could not determine the hash
*/
if (reiserfs_rupasov_hash(s)) {
code = YURA_HASH;
} else if (reiserfs_tea_hash(s)) {
code = TEA_HASH;
} else if (reiserfs_r5_hash(s)) {
code = R5_HASH;
}
}
/*
* if we are mounted RW, and we have a new valid hash code, update
* the super
*/
if (code != UNSET_HASH &&
!sb_rdonly(s) &&
code != sb_hash_function_code(SB_DISK_SUPER_BLOCK(s))) {
set_sb_hash_function_code(SB_DISK_SUPER_BLOCK(s), code);
}
return code;
}
/* return pointer to appropriate function */
static hashf_t hash_function(struct super_block *s)
{
switch (what_hash(s)) {
case TEA_HASH:
reiserfs_info(s, "Using tea hash to sort names\n");
return keyed_hash;
case YURA_HASH:
reiserfs_info(s, "Using rupasov hash to sort names\n");
return yura_hash;
case R5_HASH:
reiserfs_info(s, "Using r5 hash to sort names\n");
return r5_hash;
}
return NULL;
}
/* this is used to set up correct value for old partitions */
static int function2code(hashf_t func)
{
if (func == keyed_hash)
return TEA_HASH;
if (func == yura_hash)
return YURA_HASH;
if (func == r5_hash)
return R5_HASH;
BUG(); /* should never happen */
return 0;
}
#define SWARN(silent, s, id, ...) \
if (!(silent)) \
reiserfs_warning(s, id, __VA_ARGS__)
static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
{
struct inode *root_inode;
struct reiserfs_transaction_handle th;
int old_format = 0;
unsigned long blocks;
unsigned int commit_max_age = 0;
int jinit_done = 0;
struct reiserfs_iget_args args;
struct reiserfs_super_block *rs;
char *jdev_name;
struct reiserfs_sb_info *sbi;
int errval = -EINVAL;
char *qf_names[REISERFS_MAXQUOTAS] = {};
unsigned int qfmt = 0;
sbi = kzalloc(sizeof(struct reiserfs_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
s->s_fs_info = sbi;
/* Set default values for options: non-aggressive tails, RO on errors */
sbi->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
sbi->s_mount_opt |= (1 << REISERFS_ERROR_RO);
sbi->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
/* no preallocation minimum, be smart in reiserfs_file_write instead */
sbi->s_alloc_options.preallocmin = 0;
/* Preallocate by 16 blocks (17-1) at once */
sbi->s_alloc_options.preallocsize = 17;
/* setup default block allocator options */
reiserfs_init_alloc_options(s);
spin_lock_init(&sbi->old_work_lock);
INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
mutex_init(&sbi->lock);
sbi->lock_depth = -1;
sbi->commit_wq = alloc_workqueue("reiserfs/%s", WQ_MEM_RECLAIM, 0,
s->s_id);
if (!sbi->commit_wq) {
SWARN(silent, s, "", "Cannot allocate commit workqueue");
errval = -ENOMEM;
goto error_unlocked;
}
jdev_name = NULL;
if (reiserfs_parse_options
(s, (char *)data, &sbi->s_mount_opt, &blocks, &jdev_name,
&commit_max_age, qf_names, &qfmt) == 0) {
goto error_unlocked;
}
if (jdev_name && jdev_name[0]) {
sbi->s_jdev = kstrdup(jdev_name, GFP_KERNEL);
if (!sbi->s_jdev) {
SWARN(silent, s, "", "Cannot allocate memory for "
"journal device name");
goto error_unlocked;
}
}
#ifdef CONFIG_QUOTA
handle_quota_files(s, qf_names, &qfmt);
#endif
if (blocks) {
SWARN(silent, s, "jmacd-7", "resize option for remount only");
goto error_unlocked;
}
/*
* try old format (undistributed bitmap, super block in 8-th 1k
* block of a device)
*/
if (!read_super_block(s, REISERFS_OLD_DISK_OFFSET_IN_BYTES))
old_format = 1;
/*
* try new format (64-th 1k block), which can contain reiserfs
* super block
*/
else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
s->s_id);
goto error_unlocked;
}
s->s_time_min = 0;
s->s_time_max = U32_MAX;
rs = SB_DISK_SUPER_BLOCK(s);
/*
* Let's do basic sanity check to verify that underlying device is not
* smaller than the filesystem. If the check fails then abort and
* scream, because bad stuff will happen otherwise.
*/
if (s->s_bdev && s->s_bdev->bd_inode
&& i_size_read(s->s_bdev->bd_inode) <
sb_block_count(rs) * sb_blocksize(rs)) {
SWARN(silent, s, "", "Filesystem cannot be "
"mounted because it is bigger than the device");
SWARN(silent, s, "", "You may need to run fsck "
"or increase size of your LVM partition");
SWARN(silent, s, "", "Or may be you forgot to "
"reboot after fdisk when it told you to");
goto error_unlocked;
}
sbi->s_mount_state = SB_REISERFS_STATE(s);
sbi->s_mount_state = REISERFS_VALID_FS;
if ((errval = reiserfs_init_bitmap_cache(s))) {
SWARN(silent, s, "jmacd-8", "unable to read bitmap");
goto error_unlocked;
}
errval = -EINVAL;
#ifdef CONFIG_REISERFS_CHECK
SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
SWARN(silent, s, "", "- it is slow mode for debugging.");
#endif
/* make data=ordered the default */
if (!reiserfs_data_log(s) && !reiserfs_data_ordered(s) &&
!reiserfs_data_writeback(s)) {
sbi->s_mount_opt |= (1 << REISERFS_DATA_ORDERED);
}
if (reiserfs_data_log(s)) {
reiserfs_info(s, "using journaled data mode\n");
} else if (reiserfs_data_ordered(s)) {
reiserfs_info(s, "using ordered data mode\n");
} else {
reiserfs_info(s, "using writeback data mode\n");
}
if (reiserfs_barrier_flush(s)) {
printk("reiserfs: using flush barriers\n");
}
if (journal_init(s, jdev_name, old_format, commit_max_age)) {
SWARN(silent, s, "sh-2022",
"unable to initialize journal space");
goto error_unlocked;
} else {
/*
* once this is set, journal_release must be called
* if we error out of the mount
*/
jinit_done = 1;
}
if (reread_meta_blocks(s)) {
SWARN(silent, s, "jmacd-9",
"unable to reread meta blocks after journal init");
goto error_unlocked;
}
if (replay_only(s))
goto error_unlocked;
s->s_xattr = reiserfs_xattr_handlers;
if (bdev_read_only(s->s_bdev) && !sb_rdonly(s)) {
SWARN(silent, s, "clm-7000",
"Detected readonly device, marking FS readonly");
s->s_flags |= SB_RDONLY;
}
args.objectid = REISERFS_ROOT_OBJECTID;
args.dirid = REISERFS_ROOT_PARENT_OBJECTID;
root_inode =
iget5_locked(s, REISERFS_ROOT_OBJECTID, reiserfs_find_actor,
reiserfs_init_locked_inode, (void *)&args);
if (!root_inode) {
SWARN(silent, s, "jmacd-10", "get root inode failed");
goto error_unlocked;
}
/*
* This path assumed to be called with the BKL in the old times.
* Now we have inherited the big reiserfs lock from it and many
* reiserfs helpers called in the mount path and elsewhere require
* this lock to be held even if it's not always necessary. Let's be
* conservative and hold it early. The window can be reduced after
* careful review of the code.
*/
reiserfs_write_lock(s);
if (root_inode->i_state & I_NEW) {
reiserfs_read_locked_inode(root_inode, &args);
unlock_new_inode(root_inode);
}
s->s_root = d_make_root(root_inode);
if (!s->s_root)
goto error;
/* define and initialize hash function */
sbi->s_hash_function = hash_function(s);
if (sbi->s_hash_function == NULL) {
dput(s->s_root);
s->s_root = NULL;
goto error;
}
if (is_reiserfs_3_5(rs)
|| (is_reiserfs_jr(rs) && SB_VERSION(s) == REISERFS_VERSION_1))
set_bit(REISERFS_3_5, &sbi->s_properties);
else if (old_format)
set_bit(REISERFS_OLD_FORMAT, &sbi->s_properties);
else
set_bit(REISERFS_3_6, &sbi->s_properties);
if (!sb_rdonly(s)) {
errval = journal_begin(&th, s, 1);
if (errval) {
dput(s->s_root);
s->s_root = NULL;
goto error;
}
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
set_sb_umount_state(rs, REISERFS_ERROR_FS);
set_sb_fs_state(rs, 0);
/*
* Clear out s_bmap_nr if it would wrap. We can handle this
* case, but older revisions can't. This will cause the
* file system to fail mount on those older implementations,
* avoiding corruption. -jeffm
*/
if (bmap_would_wrap(reiserfs_bmap_count(s)) &&
sb_bmap_nr(rs) != 0) {
reiserfs_warning(s, "super-2030", "This file system "
"claims to use %u bitmap blocks in "
"its super block, but requires %u. "
"Clearing to zero.", sb_bmap_nr(rs),
reiserfs_bmap_count(s));
set_sb_bmap_nr(rs, 0);
}
if (old_format_only(s)) {
/*
* filesystem of format 3.5 either with standard
* or non-standard journal
*/
if (convert_reiserfs(s)) {
/* and -o conv is given */
if (!silent)
reiserfs_info(s,
"converting 3.5 filesystem to the 3.6 format");
if (is_reiserfs_3_5(rs))
/*
* put magic string of 3.6 format.
* 2.2 will not be able to
* mount this filesystem anymore
*/
memcpy(rs->s_v1.s_magic,
reiserfs_3_6_magic_string,
sizeof
(reiserfs_3_6_magic_string));
set_sb_version(rs, REISERFS_VERSION_2);
reiserfs_convert_objectid_map_v1(s);
set_bit(REISERFS_3_6, &sbi->s_properties);
clear_bit(REISERFS_3_5, &sbi->s_properties);
} else if (!silent) {
reiserfs_info(s, "using 3.5.x disk format\n");
}
} else
set_sb_mnt_count(rs, sb_mnt_count(rs) + 1);
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(s));
errval = journal_end(&th);
if (errval) {
dput(s->s_root);
s->s_root = NULL;
goto error;
}
reiserfs_write_unlock(s);
if ((errval = reiserfs_lookup_privroot(s)) ||
(errval = reiserfs_xattr_init(s, s->s_flags))) {
dput(s->s_root);
s->s_root = NULL;
goto error_unlocked;
}
reiserfs_write_lock(s);
/*
* look for files which were to be removed in previous session
*/
finish_unfinished(s);
} else {
if (old_format_only(s) && !silent) {
reiserfs_info(s, "using 3.5.x disk format\n");
}
reiserfs_write_unlock(s);
if ((errval = reiserfs_lookup_privroot(s)) ||
(errval = reiserfs_xattr_init(s, s->s_flags))) {
dput(s->s_root);
s->s_root = NULL;
goto error_unlocked;
}
reiserfs_write_lock(s);
}
/*
* mark hash in super block: it could be unset. overwrite should be ok
*/
set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));
handle_attrs(s);
reiserfs_proc_info_init(s);
init_waitqueue_head(&(sbi->s_wait));
spin_lock_init(&sbi->bitmap_lock);
reiserfs_write_unlock(s);
return (0);
error:
reiserfs_write_unlock(s);
error_unlocked:
/* kill the commit thread, free journal ram */
if (jinit_done) {
reiserfs_write_lock(s);
journal_release_error(NULL, s);
reiserfs_write_unlock(s);
}
if (sbi->commit_wq)
destroy_workqueue(sbi->commit_wq);
reiserfs_cancel_old_flush(s);
reiserfs_free_bitmap_cache(s);
if (SB_BUFFER_WITH_SB(s))
brelse(SB_BUFFER_WITH_SB(s));
#ifdef CONFIG_QUOTA
{
int j;
for (j = 0; j < REISERFS_MAXQUOTAS; j++)
kfree(qf_names[j]);
}
#endif
kfree(sbi->s_jdev);
kfree(sbi);
s->s_fs_info = NULL;
return errval;
}
static int reiserfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct reiserfs_super_block *rs = SB_DISK_SUPER_BLOCK(dentry->d_sb);
buf->f_namelen = (REISERFS_MAX_NAME(s->s_blocksize));
buf->f_bfree = sb_free_blocks(rs);
buf->f_bavail = buf->f_bfree;
buf->f_blocks = sb_block_count(rs) - sb_bmap_nr(rs) - 1;
buf->f_bsize = dentry->d_sb->s_blocksize;
/* changed to accommodate gcc folks. */
buf->f_type = REISERFS_SUPER_MAGIC;
buf->f_fsid.val[0] = (u32)crc32_le(0, rs->s_uuid, sizeof(rs->s_uuid)/2);
buf->f_fsid.val[1] = (u32)crc32_le(0, rs->s_uuid + sizeof(rs->s_uuid)/2,
sizeof(rs->s_uuid)/2);
return 0;
}
#ifdef CONFIG_QUOTA
static int reiserfs_write_dquot(struct dquot *dquot)
{
struct reiserfs_transaction_handle th;
int ret, err;
int depth;
reiserfs_write_lock(dquot->dq_sb);
ret =
journal_begin(&th, dquot->dq_sb,
REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
if (ret)
goto out;
depth = reiserfs_write_unlock_nested(dquot->dq_sb);
ret = dquot_commit(dquot);
reiserfs_write_lock_nested(dquot->dq_sb, depth);
err = journal_end(&th);
if (!ret && err)
ret = err;
out:
reiserfs_write_unlock(dquot->dq_sb);
return ret;
}
static int reiserfs_acquire_dquot(struct dquot *dquot)
{
struct reiserfs_transaction_handle th;
int ret, err;
int depth;
reiserfs_write_lock(dquot->dq_sb);
ret =
journal_begin(&th, dquot->dq_sb,
REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
if (ret)
goto out;
depth = reiserfs_write_unlock_nested(dquot->dq_sb);
ret = dquot_acquire(dquot);
reiserfs_write_lock_nested(dquot->dq_sb, depth);
err = journal_end(&th);
if (!ret && err)
ret = err;
out:
reiserfs_write_unlock(dquot->dq_sb);
return ret;
}
static int reiserfs_release_dquot(struct dquot *dquot)
{
struct reiserfs_transaction_handle th;
int ret, err;
reiserfs_write_lock(dquot->dq_sb);
ret =
journal_begin(&th, dquot->dq_sb,
REISERFS_QUOTA_DEL_BLOCKS(dquot->dq_sb));
reiserfs_write_unlock(dquot->dq_sb);
if (ret) {
/* Release dquot anyway to avoid endless cycle in dqput() */
dquot_release(dquot);
goto out;
}
ret = dquot_release(dquot);
reiserfs_write_lock(dquot->dq_sb);
err = journal_end(&th);
if (!ret && err)
ret = err;
reiserfs_write_unlock(dquot->dq_sb);
out:
return ret;
}
static int reiserfs_mark_dquot_dirty(struct dquot *dquot)
{
/* Are we journaling quotas? */
if (REISERFS_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
REISERFS_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
dquot_mark_dquot_dirty(dquot);
return reiserfs_write_dquot(dquot);
} else
return dquot_mark_dquot_dirty(dquot);
}
static int reiserfs_write_info(struct super_block *sb, int type)
{
struct reiserfs_transaction_handle th;
int ret, err;
int depth;
/* Data block + inode block */
reiserfs_write_lock(sb);
ret = journal_begin(&th, sb, 2);
if (ret)
goto out;
depth = reiserfs_write_unlock_nested(sb);
ret = dquot_commit_info(sb, type);
reiserfs_write_lock_nested(sb, depth);
err = journal_end(&th);
if (!ret && err)
ret = err;
out:
reiserfs_write_unlock(sb);
return ret;
}
/*
* Turn on quotas during mount time - we need to find the quota file and such...
*/
static int reiserfs_quota_on_mount(struct super_block *sb, int type)
{
return dquot_quota_on_mount(sb, REISERFS_SB(sb)->s_qf_names[type],
REISERFS_SB(sb)->s_jquota_fmt, type);
}
/*
* Standard function to be called on quota_on
*/
static int reiserfs_quota_on(struct super_block *sb, int type, int format_id,
const struct path *path)
{
int err;
struct inode *inode;
struct reiserfs_transaction_handle th;
int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;
reiserfs_write_lock(sb);
if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
err = -EINVAL;
goto out;
}
/* Quotafile not on the same filesystem? */
if (path->dentry->d_sb != sb) {
err = -EXDEV;
goto out;
}
inode = d_inode(path->dentry);
/*
* We must not pack tails for quota files on reiserfs for quota
* IO to work
*/
if (!(REISERFS_I(inode)->i_flags & i_nopack_mask)) {
err = reiserfs_unpack(inode, NULL);
if (err) {
reiserfs_warning(sb, "super-6520",
"Unpacking tail of quota file failed"
" (%d). Cannot turn on quotas.", err);
err = -EINVAL;
goto out;
}
mark_inode_dirty(inode);
}
/* Journaling quota? */
if (REISERFS_SB(sb)->s_qf_names[type]) {
/* Quotafile not of fs root? */
if (path->dentry->d_parent != sb->s_root)
reiserfs_warning(sb, "super-6521",
"Quota file not on filesystem root. "
"Journalled quota will not work.");
}
/*
* When we journal data on quota file, we have to flush journal to see
* all updates to the file when we bypass pagecache...
*/
if (reiserfs_file_data_log(inode)) {
/* Just start temporary transaction and finish it */
err = journal_begin(&th, sb, 1);
if (err)
goto out;
err = journal_end_sync(&th);
if (err)
goto out;
}
reiserfs_write_unlock(sb);
err = dquot_quota_on(sb, type, format_id, path);
if (!err) {
inode_lock(inode);
REISERFS_I(inode)->i_attrs |= REISERFS_IMMUTABLE_FL |
REISERFS_NOATIME_FL;
inode_set_flags(inode, S_IMMUTABLE | S_NOATIME,
S_IMMUTABLE | S_NOATIME);
inode_unlock(inode);
mark_inode_dirty(inode);
}
return err;
out:
reiserfs_write_unlock(sb);
return err;
}
static int reiserfs_quota_off(struct super_block *sb, int type)
{
int err;
struct inode *inode = sb_dqopt(sb)->files[type];
if (!inode || !igrab(inode))
goto out;
err = dquot_quota_off(sb, type);
if (err)
goto out_put;
inode_lock(inode);
REISERFS_I(inode)->i_attrs &= ~(REISERFS_IMMUTABLE_FL |
REISERFS_NOATIME_FL);
inode_set_flags(inode, 0, S_IMMUTABLE | S_NOATIME);
inode_unlock(inode);
mark_inode_dirty(inode);
out_put:
iput(inode);
return err;
out:
return dquot_quota_off(sb, type);
}
/*
* 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 reiserfs_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off)
{
struct inode *inode = sb_dqopt(sb)->files[type];
unsigned long blk = off >> sb->s_blocksize_bits;
int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
size_t toread;
struct buffer_head tmp_bh, *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;
/*
* Quota files are without tails so we can safely
* use this function
*/
reiserfs_write_lock(sb);
err = reiserfs_get_block(inode, blk, &tmp_bh, 0);
reiserfs_write_unlock(sb);
if (err)
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 (we know the transaction is already started and has
* enough credits)
*/
static ssize_t reiserfs_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];
unsigned long blk = off >> sb->s_blocksize_bits;
int err = 0, offset = off & (sb->s_blocksize - 1), tocopy;
int journal_quota = REISERFS_SB(sb)->s_qf_names[type] != NULL;
size_t towrite = len;
struct buffer_head tmp_bh, *bh;
if (!current->journal_info) {
printk(KERN_WARNING "reiserfs: Quota write (off=%llu, len=%llu) cancelled because transaction is not started.\n",
(unsigned long long)off, (unsigned long long)len);
return -EIO;
}
while (towrite > 0) {
tocopy = sb->s_blocksize - offset < towrite ?
sb->s_blocksize - offset : towrite;
tmp_bh.b_state = 0;
reiserfs_write_lock(sb);
err = reiserfs_get_block(inode, blk, &tmp_bh, GET_BLOCK_CREATE);
reiserfs_write_unlock(sb);
if (err)
goto out;
if (offset || tocopy != sb->s_blocksize)
bh = sb_bread(sb, tmp_bh.b_blocknr);
else
bh = sb_getblk(sb, tmp_bh.b_blocknr);
if (!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);
unlock_buffer(bh);
reiserfs_write_lock(sb);
reiserfs_prepare_for_journal(sb, bh, 1);
journal_mark_dirty(current->journal_info, bh);
if (!journal_quota)
reiserfs_add_ordered_list(inode, bh);
reiserfs_write_unlock(sb);
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->i_mtime = inode->i_ctime = current_time(inode);
mark_inode_dirty(inode);
return len - towrite;
}
#endif
static struct dentry *get_super_block(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data)
{
return mount_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
}
static int __init init_reiserfs_fs(void)
{
int ret;
ret = init_inodecache();
if (ret)
return ret;
reiserfs_proc_info_global_init();
ret = register_filesystem(&reiserfs_fs_type);
if (ret)
goto out;
return 0;
out:
reiserfs_proc_info_global_done();
destroy_inodecache();
return ret;
}
static void __exit exit_reiserfs_fs(void)
{
reiserfs_proc_info_global_done();
unregister_filesystem(&reiserfs_fs_type);
destroy_inodecache();
}
struct file_system_type reiserfs_fs_type = {
.owner = THIS_MODULE,
.name = "reiserfs",
.mount = get_super_block,
.kill_sb = reiserfs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
MODULE_ALIAS_FS("reiserfs");
MODULE_DESCRIPTION("ReiserFS journaled filesystem");
MODULE_AUTHOR("Hans Reiser <reiser@namesys.com>");
MODULE_LICENSE("GPL");
module_init(init_reiserfs_fs);
module_exit(exit_reiserfs_fs);
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