Some filesystems would like to keep private information together with each
dquot. Add callbacks alloc_dquot and destroy_dquot allowing filesystem to
allocate larger dquots from their private slab in a similar fashion we
currently allocate inodes.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/dquot.c | 19 +++++++++++++++----
include/linux/quota.h | 2 ++
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/fs/dquot.c b/fs/dquot.c
index 5e95261..e2ceb28 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -415,6 +415,14 @@ out_dqlock:
return ret;
}
+static void destroy_dquot(struct dquot *dquot)
+{
+ if (dquot->dq_sb->dq_op->destroy_dquot)
+ dquot->dq_sb->dq_op->destroy_dquot(dquot);
+ else
+ kmem_cache_free(dquot_cachep, dquot);
+}
+
/* Invalidate all dquots on the list. Note that this function is called after
* quota is disabled and pointers from inodes removed so there cannot be new
* quota users. There can still be some users of quotas due to inodes being
@@ -463,7 +471,7 @@ restart:
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
- kmem_cache_free(dquot_cachep, dquot);
+ destroy_dquot(dquot);
}
spin_unlock(&dq_list_lock);
}
@@ -527,7 +535,7 @@ static void prune_dqcache(int count)
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
- kmem_cache_free(dquot_cachep, dquot);
+ destroy_dquot(dquot);
count--;
head = free_dquots.prev;
}
@@ -629,7 +637,10 @@ static struct dquot *get_empty_dquot(struct super_block *sb, int type)
{
struct dquot *dquot;
- dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
+ if (sb->dq_op->alloc_dquot)
+ dquot = sb->dq_op->alloc_dquot(sb, type);
+ else
+ dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
if(!dquot)
return NODQUOT;
@@ -682,7 +693,7 @@ we_slept:
dqstats.lookups++;
spin_unlock(&dq_list_lock);
if (empty)
- kmem_cache_free(dquot_cachep, empty);
+ destroy_dquot(empty);
}
/* Wait for dq_lock - after this we know that either dquot_release() is already
* finished or it will be canceled due to dq_count > 1 test */
diff --git a/include/linux/quota.h b/include/linux/quota.h
index 40401b5..a46df6d 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -292,6 +292,8 @@ struct dquot_operations {
int (*free_inode) (const struct inode *, unsigned long);
int (*transfer) (struct inode *, struct iattr *);
int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
+ struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot (can be NULL if no special entries dquot are needed) */
+ void (*destroy_dquot)(struct dquot *); /* Free memory for dquot (can be NULL if alloc_dquot is NULL) */
int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
--
1.5.6
--
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