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linux_dsm_epyc7002/fs/reiserfs/super.c
Sudip Mukherjee ff7d080e52 reiserfs: fix dereference of ERR_PTR 
reiserfs_iget() returns either NULL or error code in ERR_PTR.  And we
were only checking for NULL, so in case of some other error we will try
to dereference the ERR_PTR(-errno) thinking it to be a valid pointer.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-21 17:20:51 -08:00

2567 lines
68 KiB
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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;
spin_lock(&sbi->old_work_lock);
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
reiserfs_sync_fs(s, 1);
}
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 (s->s_flags & MS_RDONLY || !(s->s_flags & MS_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);
}
static void cancel_old_flush(struct super_block *s)
{
struct reiserfs_sb_info *sbi = REISERFS_SB(s);
cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
spin_lock(&sbi->old_work_lock);
sbi->work_queued = 0;
spin_unlock(&sbi->old_work_lock);
}
static int reiserfs_freeze(struct super_block *s)
{
struct reiserfs_transaction_handle th;
cancel_old_flush(s);
reiserfs_write_lock(s);
if (!(s->s_flags & MS_RDONLY)) {
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)
{
reiserfs_allow_writes(s);
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 */
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 & MS_ACTIVE) {
ms_active_set = 0;
} else {
ms_active_set = 1;
s->s_flags |= MS_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;
}
ret = reiserfs_quota_on_mount(s, i);
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 &= ~MS_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);
}
static void reiserfs_put_super(struct super_block *s)
{
struct reiserfs_transaction_handle th;
th.t_trans_id = 0;
dquot_disable(s, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
reiserfs_write_lock(s);
/*
* change file system state to current state if it was mounted
* with read-write permissions
*/
if (!(s->s_flags & MS_RDONLY)) {
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(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_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
}
static void reiserfs_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, reiserfs_i_callback);
}
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 (inode->i_sb->s_flags & MS_RDONLY) {
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,
.destroy_inode = reiserfs_destroy_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, 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,
};
static const struct quotactl_ops reiserfs_qctl_operations = {
.quota_on = reiserfs_quota_on,
.quota_off = dquot_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 =
s->s_bdev->bd_inode->i_size >> 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 (*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 (qf_names[qtype] !=
REISERFS_SB(s)->s_qf_names[qtype])
kfree(qf_names[qtype]);
qf_names[qtype] = NULL;
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 = kstrdup(arg, GFP_KERNEL);
int err;
char *qf_names[REISERFS_MAXQUOTAS];
unsigned int qfmt = 0;
#ifdef CONFIG_QUOTA
int i;
#endif
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 & MS_RDONLY) {
reiserfs_write_unlock(s);
reiserfs_xattr_init(s, *mount_flags);
/* remount read-only */
if (s->s_flags & MS_RDONLY)
/* 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 (!(s->s_flags & MS_RDONLY)) {
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 &= ~MS_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 &= ~MS_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 & MS_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:
replace_mount_options(s, new_opts);
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(READ, 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 &&
!(s->s_flags & MS_RDONLY) &&
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;
save_mount_options(s, data);
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;
}
}
#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;
}
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;
if (bdev_read_only(s->s_bdev) && !(s->s_flags & MS_RDONLY)) {
SWARN(silent, s, "clm-7000",
"Detected readonly device, marking FS readonly");
s->s_flags |= MS_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 (!(s->s_flags & MS_RDONLY)) {
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);
cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
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->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,
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);
return dquot_quota_on(sb, type, format_id, path);
out:
reiserfs_write_unlock(sb);
return err;
}
/*
* 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_version++;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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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