struct dqstats dqstats;
-static void dqput(struct dquot *dquot);
-
static inline unsigned int
hashfn(const struct super_block *sb, unsigned int id, int type)
{
return ret;
}
-static void dquot_destroy(struct dquot *dquot)
+void dquot_destroy(struct dquot *dquot)
{
kmem_cache_free(dquot_cachep, dquot);
}
+EXPORT_SYMBOL(dquot_destroy);
static inline void do_destroy_dquot(struct dquot *dquot)
{
spin_unlock(&dq_list_lock);
}
+/* Call callback for every active dquot on given filesystem */
+int dquot_scan_active(struct super_block *sb,
+ int (*fn)(struct dquot *dquot, unsigned long priv),
+ unsigned long priv)
+{
+ struct dquot *dquot, *old_dquot = NULL;
+ int ret = 0;
+
+ mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
+ spin_lock(&dq_list_lock);
+ list_for_each_entry(dquot, &inuse_list, dq_inuse) {
+ if (!test_bit(DQ_ACTIVE_B, &dquot->dq_flags))
+ continue;
+ if (dquot->dq_sb != sb)
+ continue;
+ /* Now we have active dquot so we can just increase use count */
+ atomic_inc(&dquot->dq_count);
+ dqstats.lookups++;
+ spin_unlock(&dq_list_lock);
+ dqput(old_dquot);
+ old_dquot = dquot;
+ ret = fn(dquot, priv);
+ if (ret < 0)
+ goto out;
+ spin_lock(&dq_list_lock);
+ /* We are safe to continue now because our dquot could not
+ * be moved out of the inuse list while we hold the reference */
+ }
+ spin_unlock(&dq_list_lock);
+out:
+ dqput(old_dquot);
+ mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ return ret;
+}
+
int vfs_quota_sync(struct super_block *sb, int type)
{
struct list_head *dirty;
* NOTE: If you change this function please check whether dqput_blocks() works right...
* MUST be called with either dqptr_sem or dqonoff_mutex held
*/
-static void dqput(struct dquot *dquot)
+void dqput(struct dquot *dquot)
{
int ret;
spin_unlock(&dq_list_lock);
}
-static struct dquot *dquot_alloc(struct super_block *sb, int type)
+struct dquot *dquot_alloc(struct super_block *sb, int type)
{
return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
}
+EXPORT_SYMBOL(dquot_alloc);
static struct dquot *get_empty_dquot(struct super_block *sb, int type)
{
}
/*
+ * Check whether dquot is in memory.
+ * MUST be called with either dqptr_sem or dqonoff_mutex held
+ */
+int dquot_is_cached(struct super_block *sb, unsigned int id, int type)
+{
+ unsigned int hashent = hashfn(sb, id, type);
+ int ret = 0;
+
+ if (!sb_has_quota_active(sb, type))
+ return 0;
+ spin_lock(&dq_list_lock);
+ if (find_dquot(hashent, sb, id, type) != NODQUOT)
+ ret = 1;
+ spin_unlock(&dq_list_lock);
+ return ret;
+}
+
+/*
* Get reference to dquot
* MUST be called with either dqptr_sem or dqonoff_mutex held
*/
-static struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
+struct dquot *dqget(struct super_block *sb, unsigned int id, int type)
{
unsigned int hashent = hashfn(sb, id, type);
struct dquot *dquot, *empty = NODQUOT;
static inline void dquot_decr_inodes(struct dquot *dquot, qsize_t number)
{
- if (dquot->dq_dqb.dqb_curinodes > number)
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
+ dquot->dq_dqb.dqb_curinodes >= number)
dquot->dq_dqb.dqb_curinodes -= number;
else
dquot->dq_dqb.dqb_curinodes = 0;
static inline void dquot_decr_space(struct dquot *dquot, qsize_t number)
{
- if (dquot->dq_dqb.dqb_curspace > number)
+ if (sb_dqopt(dquot->dq_sb)->flags & DQUOT_NEGATIVE_USAGE ||
+ dquot->dq_dqb.dqb_curspace >= number)
dquot->dq_dqb.dqb_curspace -= number;
else
dquot->dq_dqb.dqb_curspace = 0;
* Release all quotas referenced by inode
* Transaction must be started at an entry
*/
-int dquot_drop(struct inode *inode)
+int dquot_drop_locked(struct inode *inode)
{
int cnt;
- down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
if (inode->i_dquot[cnt] != NODQUOT) {
dqput(inode->i_dquot[cnt]);
inode->i_dquot[cnt] = NODQUOT;
}
}
+ return 0;
+}
+
+int dquot_drop(struct inode *inode)
+{
+ down_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
+ dquot_drop_locked(inode);
up_write(&sb_dqopt(inode->i_sb)->dqptr_sem);
return 0;
}
dqopt->ops[cnt] = NULL;
}
mutex_unlock(&dqopt->dqonoff_mutex);
+
+ /* Skip syncing and setting flags if quota files are hidden */
+ if (dqopt->flags & DQUOT_QUOTA_SYS_FILE)
+ goto put_inodes;
+
/* Sync the superblock so that buffers with quota data are written to
* disk (and so userspace sees correct data afterwards). */
if (sb->s_op->sync_fs)
mark_inode_dirty(toputinode[cnt]);
}
mutex_unlock(&dqopt->dqonoff_mutex);
+ }
+ if (sb->s_bdev)
+ invalidate_bdev(sb->s_bdev);
+put_inodes:
+ 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_
else if (!toputinode[cnt]->i_nlink)
ret = -EBUSY;
}
- if (sb->s_bdev)
- invalidate_bdev(sb->s_bdev);
return ret;
}
goto out_fmt;
}
- /* As we bypass the pagecache we must now flush the inode so that
- * we see all the changes from userspace... */
- write_inode_now(inode, 1);
- /* And now flush the block cache so that kernel sees the changes */
- invalidate_bdev(sb->s_bdev);
+ if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
+ /* As we bypass the pagecache we must now flush the inode so
+ * that we see all the changes from userspace... */
+ write_inode_now(inode, 1);
+ /* And now flush the block cache so that kernel sees the
+ * changes */
+ invalidate_bdev(sb->s_bdev);
+ }
mutex_lock(&inode->i_mutex);
mutex_lock(&dqopt->dqonoff_mutex);
if (sb_has_quota_loaded(sb, type)) {
error = -EBUSY;
goto out_lock;
}
- /* 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. */
- down_write(&dqopt->dqptr_sem);
- oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
- inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
- up_write(&dqopt->dqptr_sem);
- sb->dq_op->drop(inode);
+
+ 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. */
+ down_write(&dqopt->dqptr_sem);
+ oldflags = inode->i_flags & (S_NOATIME | S_IMMUTABLE | S_NOQUOTA);
+ inode->i_flags |= S_NOQUOTA | S_NOATIME | S_IMMUTABLE;
+ up_write(&dqopt->dqptr_sem);
+ sb->dq_op->drop(inode);
+ }
error = -EIO;
dqopt->files[type] = igrab(inode);
if (di->dqb_valid & QIF_SPACE) {
dm->dqb_curspace = di->dqb_curspace;
check_blim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
}
if (di->dqb_valid & QIF_BLIMITS) {
dm->dqb_bsoftlimit = qbtos(di->dqb_bsoftlimit);
dm->dqb_bhardlimit = qbtos(di->dqb_bhardlimit);
check_blim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
}
if (di->dqb_valid & QIF_INODES) {
dm->dqb_curinodes = di->dqb_curinodes;
check_ilim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
}
if (di->dqb_valid & QIF_ILIMITS) {
dm->dqb_isoftlimit = di->dqb_isoftlimit;
dm->dqb_ihardlimit = di->dqb_ihardlimit;
check_ilim = 1;
+ __set_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
}
- if (di->dqb_valid & QIF_BTIME)
+ if (di->dqb_valid & QIF_BTIME) {
dm->dqb_btime = di->dqb_btime;
- if (di->dqb_valid & QIF_ITIME)
+ __set_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
+ }
+ if (di->dqb_valid & QIF_ITIME) {
dm->dqb_itime = di->dqb_itime;
+ __set_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
+ }
if (check_blim) {
if (!dm->dqb_bsoftlimit || dm->dqb_curspace < dm->dqb_bsoftlimit) {
EXPORT_SYMBOL(vfs_quota_on_mount);
EXPORT_SYMBOL(vfs_quota_disable);
EXPORT_SYMBOL(vfs_quota_off);
+EXPORT_SYMBOL(dquot_scan_active);
EXPORT_SYMBOL(vfs_quota_sync);
EXPORT_SYMBOL(vfs_get_dqinfo);
EXPORT_SYMBOL(vfs_set_dqinfo);
EXPORT_SYMBOL(dquot_mark_dquot_dirty);
EXPORT_SYMBOL(dquot_initialize);
EXPORT_SYMBOL(dquot_drop);
+EXPORT_SYMBOL(dquot_drop_locked);
EXPORT_SYMBOL(vfs_dq_drop);
+EXPORT_SYMBOL(dqget);
+EXPORT_SYMBOL(dqput);
+EXPORT_SYMBOL(dquot_is_cached);
EXPORT_SYMBOL(dquot_alloc_space);
EXPORT_SYMBOL(dquot_alloc_inode);
EXPORT_SYMBOL(dquot_free_space);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff