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quota: Add callbacks for allocating and destroying dquot structures

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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@suse.cz>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Jan Kara 2008-08-19 14:51:22 +02:00 committed by Mark Fasheh
parent 9f868f16e4
commit 74f783af95
2 changed files with 24 additions and 5 deletions
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27
fs/dquot.c
View File

@ -415,6 +415,16 @@ out_dqlock:
return ret;
}
static void dquot_destroy(struct dquot *dquot)
{
kmem_cache_free(dquot_cachep, dquot);
}
static inline void do_destroy_dquot(struct dquot *dquot)
{
dquot->dq_sb->dq_op->destroy_dquot(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 +473,7 @@ restart:
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
kmem_cache_free(dquot_cachep, dquot);
do_destroy_dquot(dquot);
}
spin_unlock(&dq_list_lock);
}
@ -527,7 +537,7 @@ static void prune_dqcache(int count)
remove_dquot_hash(dquot);
remove_free_dquot(dquot);
remove_inuse(dquot);
kmem_cache_free(dquot_cachep, dquot);
do_destroy_dquot(dquot);
count--;
head = free_dquots.prev;
}
@ -625,11 +635,16 @@ we_slept:
spin_unlock(&dq_list_lock);
}
static struct dquot *dquot_alloc(struct super_block *sb, int type)
{
return kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
}
static struct dquot *get_empty_dquot(struct super_block *sb, int type)
{
struct dquot *dquot;
dquot = kmem_cache_zalloc(dquot_cachep, GFP_NOFS);
dquot = sb->dq_op->alloc_dquot(sb, type);
if(!dquot)
return NODQUOT;
@ -682,7 +697,7 @@ we_slept:
dqstats.lookups++;
spin_unlock(&dq_list_lock);
if (empty)
kmem_cache_free(dquot_cachep, empty);
do_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 */
@ -1533,7 +1548,9 @@ struct dquot_operations dquot_operations = {
.acquire_dquot = dquot_acquire,
.release_dquot = dquot_release,
.mark_dirty = dquot_mark_dquot_dirty,
.write_info = dquot_commit_info
.write_info = dquot_commit_info,
.alloc_dquot = dquot_alloc,
.destroy_dquot = dquot_destroy,
};
static inline void set_enable_flags(struct quota_info *dqopt, int type)

2
include/linux/quota.h
View File

@ -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 */
void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
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 */