Commit b8072d5b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for_v5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull ext2, quota, reiserfs cleanups and fixes from Jan Kara:

 - Refactor the quota on/off kernel internal interfaces (mostly for
   ubifs quota support as ubifs does not want to have inodes holding
   quota information)

 - A few other small quota fixes and cleanups

 - Various small ext2 fixes and cleanups

 - Reiserfs xattr fix and one cleanup

* tag 'for_v5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (28 commits)
  ext2: code cleanup for descriptor_loc()
  fs/quota: handle overflows of sysctl fs.quota.* and report as unsigned long
  ext2: fix improper function comment
  ext2: code cleanup for ext2_try_to_allocate()
  ext2: skip unnecessary operations in ext2_try_to_allocate()
  ext2: Simplify initialization in ext2_try_to_allocate()
  ext2: code cleanup by calling ext2_group_last_block_no()
  ext2: introduce new helper ext2_group_last_block_no()
  reiserfs: replace open-coded atomic_dec_and_mutex_lock()
  ext2: check err when partial != NULL
  quota: Handle quotas without quota inodes in dquot_get_state()
  quota: Make dquot_disable() work without quota inodes
  quota: Drop dquot_enable()
  fs: Use dquot_load_quota_inode() from filesystems
  quota: Rename vfs_load_quota_inode() to dquot_load_quota_inode()
  quota: Simplify dquot_resume()
  quota: Factor out setup of quota inode
  quota: Check that quota is not dirty before release
  quota: fix livelock in dquot_writeback_dquots
  ext2: don't set *count in the case of failure in ext2_try_to_allocate()
  ...
parents e2d73c30 545886fe
......@@ -269,7 +269,7 @@ goal_in_my_reservation(struct ext2_reserve_window *rsv, ext2_grpblk_t grp_goal,
ext2_fsblk_t group_first_block, group_last_block;
group_first_block = ext2_group_first_block_no(sb, group);
group_last_block = group_first_block + EXT2_BLOCKS_PER_GROUP(sb) - 1;
group_last_block = ext2_group_last_block_no(sb, group);
if ((rsv->_rsv_start > group_last_block) ||
(rsv->_rsv_end < group_first_block))
......@@ -666,37 +666,24 @@ ext2_try_to_allocate(struct super_block *sb, int group,
unsigned long *count,
struct ext2_reserve_window *my_rsv)
{
ext2_fsblk_t group_first_block;
ext2_fsblk_t group_first_block = ext2_group_first_block_no(sb, group);
ext2_fsblk_t group_last_block = ext2_group_last_block_no(sb, group);
ext2_grpblk_t start, end;
unsigned long num = 0;
start = 0;
end = group_last_block - group_first_block + 1;
/* we do allocation within the reservation window if we have a window */
if (my_rsv) {
group_first_block = ext2_group_first_block_no(sb, group);
if (my_rsv->_rsv_start >= group_first_block)
start = my_rsv->_rsv_start - group_first_block;
else
/* reservation window cross group boundary */
start = 0;
end = my_rsv->_rsv_end - group_first_block + 1;
if (end > EXT2_BLOCKS_PER_GROUP(sb))
/* reservation window crosses group boundary */
end = EXT2_BLOCKS_PER_GROUP(sb);
if ((start <= grp_goal) && (grp_goal < end))
start = grp_goal;
else
if (my_rsv->_rsv_end < group_last_block)
end = my_rsv->_rsv_end - group_first_block + 1;
if (grp_goal < start || grp_goal >= end)
grp_goal = -1;
} else {
if (grp_goal > 0)
start = grp_goal;
else
start = 0;
end = EXT2_BLOCKS_PER_GROUP(sb);
}
BUG_ON(start > EXT2_BLOCKS_PER_GROUP(sb));
repeat:
if (grp_goal < 0) {
grp_goal = find_next_usable_block(start, bitmap_bh, end);
if (grp_goal < 0)
......@@ -711,32 +698,23 @@ ext2_try_to_allocate(struct super_block *sb, int group,
;
}
}
start = grp_goal;
if (ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group), grp_goal,
bitmap_bh->b_data)) {
/*
* The block was allocated by another thread, or it was
* allocated and then freed by another thread
*/
start++;
grp_goal++;
if (start >= end)
goto fail_access;
goto repeat;
}
num++;
grp_goal++;
while (num < *count && grp_goal < end
&& !ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group),
for (; num < *count && grp_goal < end; grp_goal++) {
if (ext2_set_bit_atomic(sb_bgl_lock(EXT2_SB(sb), group),
grp_goal, bitmap_bh->b_data)) {
if (num == 0)
continue;
break;
}
num++;
grp_goal++;
}
if (num == 0)
goto fail_access;
*count = num;
return grp_goal - num;
fail_access:
*count = num;
return -1;
}
......@@ -754,10 +732,9 @@ ext2_try_to_allocate(struct super_block *sb, int group,
* but we will shift to the place where start_block is,
* then start from there, when looking for a reservable space.
*
* @size: the target new reservation window size
* @sb: the super block.
*
* @group_first_block: the first block we consider to start
* the real search from
* @start_block: the first block we consider to start the real search from
*
* @last_block:
* the maximum block number that our goal reservable space
......@@ -908,7 +885,7 @@ static int alloc_new_reservation(struct ext2_reserve_window_node *my_rsv,
spinlock_t *rsv_lock = &EXT2_SB(sb)->s_rsv_window_lock;
group_first_block = ext2_group_first_block_no(sb, group);
group_end_block = group_first_block + (EXT2_BLOCKS_PER_GROUP(sb) - 1);
group_end_block = ext2_group_last_block_no(sb, group);
if (grp_goal < 0)
start_block = group_first_block;
......@@ -1115,7 +1092,7 @@ ext2_try_to_allocate_with_rsv(struct super_block *sb, unsigned int group,
* first block is the block number of the first block in this group
*/
group_first_block = ext2_group_first_block_no(sb, group);
group_last_block = group_first_block + (EXT2_BLOCKS_PER_GROUP(sb) - 1);
group_last_block = ext2_group_last_block_no(sb, group);
/*
* Basically we will allocate a new block from inode's reservation
......@@ -1313,6 +1290,13 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
if (free_blocks > 0) {
grp_target_blk = ((goal - le32_to_cpu(es->s_first_data_block)) %
EXT2_BLOCKS_PER_GROUP(sb));
/*
* In case we retry allocation (due to fs reservation not
* working out or fs corruption), the bitmap_bh is non-null
* pointer and we have to release it before calling
* read_block_bitmap().
*/
brelse(bitmap_bh);
bitmap_bh = read_block_bitmap(sb, group_no);
if (!bitmap_bh)
goto io_error;
......@@ -1404,6 +1388,7 @@ ext2_fsblk_t ext2_new_blocks(struct inode *inode, ext2_fsblk_t goal,
* use. So we may want to selectively mark some of the blocks
* as free
*/
num = *count;
goto retry_alloc;
}
......
......@@ -813,6 +813,18 @@ ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
}
static inline ext2_fsblk_t
ext2_group_last_block_no(struct super_block *sb, unsigned long group_no)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
if (group_no == sbi->s_groups_count - 1)
return le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
else
return ext2_group_first_block_no(sb, group_no) +
EXT2_BLOCKS_PER_GROUP(sb) - 1;
}
#define ext2_set_bit __test_and_set_bit_le
#define ext2_clear_bit __test_and_clear_bit_le
#define ext2_test_bit test_bit_le
......
......@@ -701,10 +701,13 @@ static int ext2_get_blocks(struct inode *inode,
if (!partial) {
count++;
mutex_unlock(&ei->truncate_mutex);
if (err)
goto cleanup;
goto got_it;
}
if (err) {
mutex_unlock(&ei->truncate_mutex);
goto cleanup;
}
}
/*
......
......@@ -145,10 +145,13 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (ei->i_block_alloc_info){
struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
rsv->rsv_goal_size = rsv_window_size;
} else {
ret = -ENOMEM;
}
mutex_unlock(&ei->truncate_mutex);
mnt_drop_write_file(filp);
return 0;
return ret;
}
default:
return -ENOTTY;
......
......@@ -702,13 +702,7 @@ static int ext2_check_descriptors(struct super_block *sb)
for (i = 0; i < sbi->s_groups_count; i++) {
struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL);
ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i);
ext2_fsblk_t last_block;
if (i == sbi->s_groups_count - 1)
last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
else
last_block = first_block +
(EXT2_BLOCKS_PER_GROUP(sb) - 1);
ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i);
if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
le32_to_cpu(gdp->bg_block_bitmap) > last_block)
......@@ -806,7 +800,6 @@ static unsigned long descriptor_loc(struct super_block *sb,
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
unsigned long bg, first_meta_bg;
int has_super = 0;
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
......@@ -814,10 +807,8 @@ static unsigned long descriptor_loc(struct super_block *sb,
nr < first_meta_bg)
return (logic_sb_block + nr + 1);
bg = sbi->s_desc_per_block * nr;
if (ext2_bg_has_super(sb, bg))
has_super = 1;
return ext2_group_first_block_no(sb, bg) + has_super;
return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg);
}
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
......
......@@ -5834,7 +5834,7 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
/* Don't account quota for quota files to avoid recursion */
qf_inode->i_flags |= S_NOQUOTA;
lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
err = dquot_enable(qf_inode, type, format_id, flags);
err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
if (err)
lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
iput(qf_inode);
......
......@@ -1940,7 +1940,7 @@ static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
/* Don't account quota for quota files to avoid recursion */
qf_inode->i_flags |= S_NOQUOTA;
err = dquot_enable(qf_inode, type, format_id, flags);
err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
iput(qf_inode);
return err;
}
......
......@@ -728,7 +728,7 @@ static int ocfs2_release_dquot(struct dquot *dquot)
mutex_lock(&dquot->dq_lock);
/* Check whether we are not racing with some other dqget() */
if (atomic_read(&dquot->dq_count) > 1)
if (dquot_is_busy(dquot))
goto out;
/* Running from downconvert thread? Postpone quota processing to wq */
if (current == osb->dc_task) {
......
......@@ -926,8 +926,8 @@ static int ocfs2_enable_quotas(struct ocfs2_super *osb)
status = -ENOENT;
goto out_quota_off;
}
status = dquot_enable(inode[type], type, QFMT_OCFS2,
DQUOT_USAGE_ENABLED);
status = dquot_load_quota_inode(inode[type], type, QFMT_OCFS2,
DQUOT_USAGE_ENABLED);
if (status < 0)
goto out_quota_off;
}
......
......@@ -497,7 +497,7 @@ int dquot_release(struct dquot *dquot)
mutex_lock(&dquot->dq_lock);
/* Check whether we are not racing with some other dqget() */
if (atomic_read(&dquot->dq_count) > 1)
if (dquot_is_busy(dquot))
goto out_dqlock;
if (dqopt->ops[dquot->dq_id.type]->release_dqblk) {
ret = dqopt->ops[dquot->dq_id.type]->release_dqblk(dquot);
......@@ -595,7 +595,6 @@ int dquot_scan_active(struct super_block *sb,
/* Now we have active dquot so we can just increase use count */
atomic_inc(&dquot->dq_count);
spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
dqput(old_dquot);
old_dquot = dquot;
/*
......@@ -623,7 +622,7 @@ EXPORT_SYMBOL(dquot_scan_active);
/* Write all dquot structures to quota files */
int dquot_writeback_dquots(struct super_block *sb, int type)
{
struct list_head *dirty;
struct list_head dirty;
struct dquot *dquot;
struct quota_info *dqopt = sb_dqopt(sb);
int cnt;
......@@ -637,9 +636,10 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
if (!sb_has_quota_active(sb, cnt))
continue;
spin_lock(&dq_list_lock);
dirty = &dqopt->info[cnt].dqi_dirty_list;
while (!list_empty(dirty)) {
dquot = list_first_entry(dirty, struct dquot,
/* Move list away to avoid livelock. */
list_replace_init(&dqopt->info[cnt].dqi_dirty_list, &dirty);
while (!list_empty(&dirty)) {
dquot = list_first_entry(&dirty, struct dquot,
dq_dirty);
WARN_ON(!test_bit(DQ_ACTIVE_B, &dquot->dq_flags));
......@@ -649,7 +649,6 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
* use count */
dqgrab(dquot);
spin_unlock(&dq_list_lock);
dqstats_inc(DQST_LOOKUPS);
err = sb->dq_op->write_dquot(dquot);
if (err) {
/*
......@@ -2162,14 +2161,29 @@ int dquot_file_open(struct inode *inode, struct file *file)
}
EXPORT_SYMBOL(dquot_file_open);
static void vfs_cleanup_quota_inode(struct super_block *sb, int type)
{
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *inode = dqopt->files[type];
if (!inode)
return;
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
inode_lock(inode);
inode->i_flags &= ~S_NOQUOTA;
inode_unlock(inode);
}
dqopt->files[type] = NULL;
iput(inode);
}
/*
* Turn quota off on a device. type == -1 ==> quotaoff for all types (umount)
*/
int dquot_disable(struct super_block *sb, int type, unsigned int flags)
{
int cnt, ret = 0;
int cnt;
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *toputinode[MAXQUOTAS];
/* s_umount should be held in exclusive mode */
if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
......@@ -2191,7 +2205,6 @@ int dquot_disable(struct super_block *sb, int type, unsigned int flags)
return 0;
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
toputinode[cnt] = NULL;
if (type != -1 && cnt != type)
continue;
if (!sb_has_quota_loaded(sb, cnt))
......@@ -2211,8 +2224,7 @@ int dquot_disable(struct super_block *sb, int type, unsigned int flags)
dqopt->flags &= ~dquot_state_flag(
DQUOT_SUSPENDED, cnt);
spin_unlock(&dq_state_lock);
iput(dqopt->files[cnt]);
dqopt->files[cnt] = NULL;
vfs_cleanup_quota_inode(sb, cnt);
continue;
}
spin_unlock(&dq_state_lock);
......@@ -2234,10 +2246,6 @@ int dquot_disable(struct super_block *sb, int type, unsigned int flags)
if (dqopt->ops[cnt]->free_file_info)
dqopt->ops[cnt]->free_file_info(sb, cnt);
put_quota_format(dqopt->info[cnt].dqi_format);
toputinode[cnt] = dqopt->files[cnt];
if (!sb_has_quota_loaded(sb, cnt))
dqopt->files[cnt] = NULL;
dqopt->info[cnt].dqi_flags = 0;
dqopt->info[cnt].dqi_igrace = 0;
dqopt->info[cnt].dqi_bgrace = 0;
......@@ -2259,32 +2267,22 @@ int dquot_disable(struct super_block *sb, int type, unsigned int flags)
* must also discard the blockdev buffers so that we see the
* changes done by userspace on the next quotaon() */
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
/* This can happen when suspending quotas on remount-ro... */
if (toputinode[cnt] && !sb_has_quota_loaded(sb, cnt)) {
inode_lock(toputinode[cnt]);
toputinode[cnt]->i_flags &= ~S_NOQUOTA;
truncate_inode_pages(&toputinode[cnt]->i_data, 0);
inode_unlock(toputinode[cnt]);
mark_inode_dirty_sync(toputinode[cnt]);
if (!sb_has_quota_loaded(sb, cnt) && dqopt->files[cnt]) {
inode_lock(dqopt->files[cnt]);
truncate_inode_pages(&dqopt->files[cnt]->i_data, 0);
inode_unlock(dqopt->files[cnt]);
}
if (sb->s_bdev)
invalidate_bdev(sb->s_bdev);
put_inodes:
/* We are done when suspending quotas */
if (flags & DQUOT_SUSPENDED)
return 0;
for (cnt = 0; cnt < MAXQUOTAS; cnt++)
if (toputinode[cnt]) {
/* On remount RO, we keep the inode pointer so that we
* can reenable quota on the subsequent remount RW. We
* have to check 'flags' variable and not use sb_has_
* function because another quotaon / quotaoff could
* change global state before we got here. We refuse
* to suspend quotas when there is pending delete on
* the quota file... */
if (!(flags & DQUOT_SUSPENDED))
iput(toputinode[cnt]);
else if (!toputinode[cnt]->i_nlink)
ret = -EBUSY;
}
return ret;
if (!sb_has_quota_loaded(sb, cnt))
vfs_cleanup_quota_inode(sb, cnt);
return 0;
}
EXPORT_SYMBOL(dquot_disable);
......@@ -2299,28 +2297,52 @@ EXPORT_SYMBOL(dquot_quota_off);
* Turn quotas on on a device
*/
/*
* Helper function to turn quotas on when we already have the inode of
* quota file and no quota information is loaded.
*/
static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
static int vfs_setup_quota_inode(struct inode *inode, int type)
{
struct super_block *sb = inode->i_sb;
struct quota_info *dqopt = sb_dqopt(sb);
if (!S_ISREG(inode->i_mode))
return -EACCES;
if (IS_RDONLY(inode))
return -EROFS;
if (sb_has_quota_loaded(sb, type))
return -EBUSY;
dqopt->files[type] = igrab(inode);
if (!dqopt->files[type])
return -EIO;
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
/* We don't want quota and atime on quota files (deadlocks
* possible) Also nobody should write to the file - we use
* special IO operations which ignore the immutable bit. */
inode_lock(inode);
inode->i_flags |= S_NOQUOTA;
inode_unlock(inode);
/*
* When S_NOQUOTA is set, remove dquot references as no more
* references can be added
*/
__dquot_drop(inode);
}
return 0;
}
int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
unsigned int flags)
{
struct quota_format_type *fmt = find_quota_format(format_id);
struct super_block *sb = inode->i_sb;
struct quota_info *dqopt = sb_dqopt(sb);
int error;
/* Just unsuspend quotas? */
BUG_ON(flags & DQUOT_SUSPENDED);
/* s_umount should be held in exclusive mode */
if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
up_read(&sb->s_umount);
if (!fmt)
return -ESRCH;
if (!S_ISREG(inode->i_mode)) {
error = -EACCES;
goto out_fmt;
}
if (IS_RDONLY(inode)) {
error = -EROFS;
goto out_fmt;
}
if (!sb->s_op->quota_write || !sb->s_op->quota_read ||
(type == PRJQUOTA && sb->dq_op->get_projid == NULL)) {
error = -EINVAL;
......@@ -2352,27 +2374,9 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
invalidate_bdev(sb->s_bdev);
}
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
/* We don't want quota and atime on quota files (deadlocks
* possible) Also nobody should write to the file - we use
* special IO operations which ignore the immutable bit. */
inode_lock(inode);
inode->i_flags |= S_NOQUOTA;
inode_unlock(inode);
/*
* When S_NOQUOTA is set, remove dquot references as no more
* references can be added
*/
__dquot_drop(inode);
}
error = -EIO;
dqopt->files[type] = igrab(inode);
if (!dqopt->files[type])
goto out_file_flags;
error = -EINVAL;
if (!fmt->qf_ops->check_quota_file(sb, type))
goto out_file_init;
goto out_fmt;
dqopt->ops[type] = fmt->qf_ops;
dqopt->info[type].dqi_format = fmt;
......@@ -2380,7 +2384,7 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
INIT_LIST_HEAD(&dqopt->info[type].dqi_dirty_list);
error = dqopt->ops[type]->read_file_info(sb, type);
if (error < 0)
goto out_file_init;
goto out_fmt;
if (dqopt->flags & DQUOT_QUOTA_SYS_FILE) {
spin_lock(&dq_data_lock);
dqopt->info[type].dqi_flags |= DQF_SYS_FILE;
......@@ -2395,24 +2399,36 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
dquot_disable(sb, type, flags);
return error;
out_file_init:
dqopt->files[type] = NULL;
iput(inode);
out_file_flags:
inode_lock(inode);
inode->i_flags &= ~S_NOQUOTA;
inode_unlock(inode);
out_fmt:
put_quota_format(fmt);
return error;
}
EXPORT_SYMBOL(dquot_load_quota_sb);
/*
* More powerful function for turning on quotas on given quota inode allowing
* setting of individual quota flags
*/
int dquot_load_quota_inode(struct inode *inode, int type, int format_id,
unsigned int flags)
{
int err;
err = vfs_setup_quota_inode(inode, type);
if (err < 0)
return err;
err = dquot_load_quota_sb(inode->i_sb, type, format_id, flags);
if (err < 0)
vfs_cleanup_quota_inode(inode->i_sb, type);
return err;
}
EXPORT_SYMBOL(dquot_load_quota_inode);
/* Reenable quotas on remount RW */
int dquot_resume(struct super_block *sb, int type)
{
struct quota_info *dqopt = sb_dqopt(sb);
struct inode *inode;
int ret = 0, cnt;
unsigned int flags;
......@@ -2426,8 +2442,6 @@ int dquot_resume(struct super_block *sb, int type)
if (!sb_has_quota_suspended(sb, cnt))
continue;
inode = dqopt->files[cnt];
dqopt->files[cnt] = NULL;
spin_lock(&dq_state_lock);
flags = dqopt->flags & dquot_state_flag(DQUOT_USAGE_ENABLED |
DQUOT_LIMITS_ENABLED,
......@@ -2436,9 +2450,10 @@ int dquot_resume(struct super_block *sb, int type)
spin_unlock(&dq_state_lock);
flags = dquot_generic_flag(flags, cnt);
ret = vfs_load_quota_inode(inode, cnt,
dqopt->info[cnt].dqi_fmt_id, flags);
iput(inode);
ret = dquot_load_quota_sb(sb, cnt, dqopt->info[cnt].dqi_fmt_id,
flags);
if (ret < 0)
vfs_cleanup_quota_inode(sb, type);
}
return ret;
......@@ -2455,48 +2470,13 @@ int dquot_quota_on(struct super_block *sb, int type, int format_id,
if (path->dentry->d_sb != sb)
error = -EXDEV;
else
error = vfs_load_quota_inode(d_inode(path->dentry), type,
error = dquot_load_quota_inode(d_inode(path->dentry), type,
format_id, DQUOT_USAGE_ENABLED |
DQUOT_LIMITS_ENABLED);
return error;
}
EXPORT_SYMBOL(dquot_quota_on);
/*
* More powerful function for turning on quotas allowing setting
* of individual quota flags
*/
int dquot_enable(struct inode *inode, int type, int format_id,
unsigned int flags)
{
struct super_block *sb = inode->i_sb;
/* Just unsuspend quotas? */
BUG_ON(flags & DQUOT_SUSPENDED);
/* s_umount should be held in exclusive mode */
if (WARN_ON_ONCE(down_read_trylock(&sb->s_umount)))
up_read<