[mirror_ubuntu-artful-kernel.git] / include / linux / quotaops.h

/*
 * Definitions for diskquota-operations. When diskquota is configured these
 * macros expand to the right source-code.
 *
 * Author:  Marco van Wieringen <mvw@planets.elm.net>
 *
 * Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
 *
 */
#ifndef _LINUX_QUOTAOPS_
#define _LINUX_QUOTAOPS_

#include <linux/smp_lock.h>

#include <linux/fs.h>

#if defined(CONFIG_QUOTA)

/*
 * declaration of quota_function calls in kernel.
 */
extern void sync_dquots(struct super_block *sb, int type);

extern int dquot_initialize(struct inode *inode, int type);
extern int dquot_drop(struct inode *inode);

extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);

extern int dquot_free_space(struct inode *inode, qsize_t number);
extern int dquot_free_inode(const struct inode *inode, unsigned long number);

extern int dquot_transfer(struct inode *inode, struct iattr *iattr);
extern int dquot_commit(struct dquot *dquot);
extern int dquot_acquire(struct dquot *dquot);
extern int dquot_release(struct dquot *dquot);
extern int dquot_commit_info(struct super_block *sb, int type);
extern int dquot_mark_dquot_dirty(struct dquot *dquot);

extern int vfs_quota_on(struct super_block *sb, int type, int format_id, char *path);
extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
		int format_id, int type);
extern int vfs_quota_off(struct super_block *sb, int type);
#define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type)
extern int vfs_quota_sync(struct super_block *sb, int type);
extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
extern int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);

/*
 * Operations supported for diskquotas.
 */
extern struct dquot_operations dquot_operations;
extern struct quotactl_ops vfs_quotactl_ops;

#define sb_dquot_ops (&dquot_operations)
#define sb_quotactl_ops (&vfs_quotactl_ops)

/* It is better to call this function outside of any transaction as it might
 * need a lot of space in journal for dquot structure allocation. */
static __inline__ void DQUOT_INIT(struct inode *inode)
{
	BUG_ON(!inode->i_sb);
	if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
		inode->i_sb->dq_op->initialize(inode, -1);
}

/* The same as with DQUOT_INIT */
static __inline__ void DQUOT_DROP(struct inode *inode)
{
	/* Here we can get arbitrary inode from clear_inode() so we have
	 * to be careful. OTOH we don't need locking as quota operations
	 * are allowed to change only at mount time */
	if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
	    && inode->i_sb->dq_op->drop) {
		int cnt;
		/* Test before calling to rule out calls from proc and such
                 * where we are not allowed to block. Note that this is
		 * actually reliable test even without the lock - the caller
		 * must assure that nobody can come after the DQUOT_DROP and
		 * add quota pointers back anyway */
		for (cnt = 0; cnt < MAXQUOTAS; cnt++)
			if (inode->i_dquot[cnt] != NODQUOT)
				break;
		if (cnt < MAXQUOTAS)
			inode->i_sb->dq_op->drop(inode);
	}
}

/* The following allocation/freeing/transfer functions *must* be called inside
 * a transaction (deadlocks possible otherwise) */
static __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	if (sb_any_quota_enabled(inode->i_sb)) {
		/* Used space is updated in alloc_space() */
		if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
			return 1;
	}
	else
		inode_add_bytes(inode, nr);
	return 0;
}

static __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
{
	int ret;
        if (!(ret =  DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
		mark_inode_dirty(inode);
	return ret;
}

static __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	if (sb_any_quota_enabled(inode->i_sb)) {
		/* Used space is updated in alloc_space() */
		if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
			return 1;
	}
	else
		inode_add_bytes(inode, nr);
	return 0;
}

static __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
{
	int ret;
	if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
		mark_inode_dirty(inode);
	return ret;
}

static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode)
{
	if (sb_any_quota_enabled(inode->i_sb)) {
		DQUOT_INIT(inode);
		if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
			return 1;
	}
	return 0;
}

static __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	if (sb_any_quota_enabled(inode->i_sb))
		inode->i_sb->dq_op->free_space(inode, nr);
	else
		inode_sub_bytes(inode, nr);
}

static __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
{
	DQUOT_FREE_SPACE_NODIRTY(inode, nr);
	mark_inode_dirty(inode);
}

static __inline__ void DQUOT_FREE_INODE(struct inode *inode)
{
	if (sb_any_quota_enabled(inode->i_sb))
		inode->i_sb->dq_op->free_inode(inode, 1);
}

static __inline__ int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
{
	if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
		DQUOT_INIT(inode);
		if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
			return 1;
	}
	return 0;
}

/* The following two functions cannot be called inside a transaction */
#define DQUOT_SYNC(sb)	sync_dquots(sb, -1)

static __inline__ int DQUOT_OFF(struct super_block *sb)
{
	int ret = -ENOSYS;

	if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
		ret = sb->s_qcop->quota_off(sb, -1);
	return ret;
}

#else

/*
 * NO-OP when quota not configured.
 */
#define sb_dquot_ops				(NULL)
#define sb_quotactl_ops				(NULL)
#define DQUOT_INIT(inode)			do { } while(0)
#define DQUOT_DROP(inode)			do { } while(0)
#define DQUOT_ALLOC_INODE(inode)		(0)
#define DQUOT_FREE_INODE(inode)			do { } while(0)
#define DQUOT_SYNC(sb)				do { } while(0)
#define DQUOT_OFF(sb)				do { } while(0)
#define DQUOT_TRANSFER(inode, iattr)		(0)
static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	inode_add_bytes(inode, nr);
	return 0;
}

static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
{
	DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
	mark_inode_dirty(inode);
	return 0;
}

static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	inode_add_bytes(inode, nr);
	return 0;
}

static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
{
	DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
	mark_inode_dirty(inode);
	return 0;
}

static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
{
	inode_sub_bytes(inode, nr);
}

static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
{
	DQUOT_FREE_SPACE_NODIRTY(inode, nr);
	mark_inode_dirty(inode);
}	

#endif /* CONFIG_QUOTA */

#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr)	DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
#define DQUOT_PREALLOC_BLOCK(inode, nr)	DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
#define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
#define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)

#endif /* _LINUX_QUOTAOPS_ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Definitions for diskquota-operations. When diskquota is configured these
	3	* macros expand to the right source-code.
	4	*
	5	* Author: Marco van Wieringen <mvw@planets.elm.net>
	6	*
	7	* Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
	8	*
	9	*/
	10	#ifndef _LINUX_QUOTAOPS_
	11	#define _LINUX_QUOTAOPS_
	12
1da177e4 LT	13	#include <linux/smp_lock.h>
	14
	15	#include <linux/fs.h>
	16
	17	#if defined(CONFIG_QUOTA)
	18
	19	/*
	20	* declaration of quota_function calls in kernel.
	21	*/
	22	extern void sync_dquots(struct super_block *sb, int type);
	23
	24	extern int dquot_initialize(struct inode *inode, int type);
	25	extern int dquot_drop(struct inode *inode);
	26
	27	extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
	28	extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
	29
	30	extern int dquot_free_space(struct inode *inode, qsize_t number);
	31	extern int dquot_free_inode(const struct inode *inode, unsigned long number);
	32
	33	extern int dquot_transfer(struct inode inode, struct iattr iattr);
	34	extern int dquot_commit(struct dquot *dquot);
	35	extern int dquot_acquire(struct dquot *dquot);
	36	extern int dquot_release(struct dquot *dquot);
	37	extern int dquot_commit_info(struct super_block *sb, int type);
	38	extern int dquot_mark_dquot_dirty(struct dquot *dquot);
	39
	40	extern int vfs_quota_on(struct super_block sb, int type, int format_id, char path);
84de856e CH	41	extern int vfs_quota_on_mount(struct super_block sb, char qf_name,
84de856e CH	42	int format_id, int type);
1da177e4 LT	43	extern int vfs_quota_off(struct super_block *sb, int type);
	44	#define vfs_quota_off_mount(sb, type) vfs_quota_off(sb, type)
	45	extern int vfs_quota_sync(struct super_block *sb, int type);
	46	extern int vfs_get_dqinfo(struct super_block sb, int type, struct if_dqinfo ii);
	47	extern int vfs_set_dqinfo(struct super_block sb, int type, struct if_dqinfo ii);
	48	extern int vfs_get_dqblk(struct super_block sb, int type, qid_t id, struct if_dqblk di);
	49	extern int vfs_set_dqblk(struct super_block sb, int type, qid_t id, struct if_dqblk di);
	50
	51	/*
	52	* Operations supported for diskquotas.
	53	*/
	54	extern struct dquot_operations dquot_operations;
	55	extern struct quotactl_ops vfs_quotactl_ops;
	56
	57	#define sb_dquot_ops (&dquot_operations)
	58	#define sb_quotactl_ops (&vfs_quotactl_ops)
	59
	60	/* It is better to call this function outside of any transaction as it might
	61	* need a lot of space in journal for dquot structure allocation. */
	62	static __inline__ void DQUOT_INIT(struct inode *inode)
	63	{
	64	BUG_ON(!inode->i_sb);
	65	if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
	66	inode->i_sb->dq_op->initialize(inode, -1);
	67	}
	68
	69	/* The same as with DQUOT_INIT */
	70	static __inline__ void DQUOT_DROP(struct inode *inode)
	71	{
	72	/* Here we can get arbitrary inode from clear_inode() so we have
	73	* to be careful. OTOH we don't need locking as quota operations
	74	* are allowed to change only at mount time */
	75	if (!IS_NOQUOTA(inode) && inode->i_sb && inode->i_sb->dq_op
	76	&& inode->i_sb->dq_op->drop) {
	77	int cnt;
	78	/* Test before calling to rule out calls from proc and such
	79	* where we are not allowed to block. Note that this is
	80	* actually reliable test even without the lock - the caller
	81	* must assure that nobody can come after the DQUOT_DROP and
	82	* add quota pointers back anyway */
	83	for (cnt = 0; cnt < MAXQUOTAS; cnt++)
	84	if (inode->i_dquot[cnt] != NODQUOT)
	85	break;
	86	if (cnt < MAXQUOTAS)
	87	inode->i_sb->dq_op->drop(inode);
	88	}
	89	}
	90
	91	/* The following allocation/freeing/transfer functions must be called inside
	92	* a transaction (deadlocks possible otherwise) */
	93	static __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
	94	{
	95	if (sb_any_quota_enabled(inode->i_sb)) {
	96	/* Used space is updated in alloc_space() */
	97	if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
	98	return 1;
	99	}
	100	else
	101	inode_add_bytes(inode, nr);
	102	return 0;
	103	}
	104
	105	static __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
	106	{
107	int ret;
108	if (!(ret = DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr)))
109	mark_inode_dirty(inode);
110	return ret;
111	}
112
113	static __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
114	{
115	if (sb_any_quota_enabled(inode->i_sb)) {
116	/* Used space is updated in alloc_space() */
117	if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
118	return 1;
119	}
120	else
121	inode_add_bytes(inode, nr);
122	return 0;
123	}
124
125	static __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
126	{
127	int ret;
128	if (!(ret = DQUOT_ALLOC_SPACE_NODIRTY(inode, nr)))
129	mark_inode_dirty(inode);
130	return ret;
131	}
132
133	static __inline__ int DQUOT_ALLOC_INODE(struct inode *inode)
134	{
135	if (sb_any_quota_enabled(inode->i_sb)) {
136	DQUOT_INIT(inode);
137	if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
138	return 1;
139	}
140	return 0;
141	}
142
143	static __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
144	{
145	if (sb_any_quota_enabled(inode->i_sb))
146	inode->i_sb->dq_op->free_space(inode, nr);
147	else
148	inode_sub_bytes(inode, nr);
149	}
150
151	static __inline__ void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
152	{
153	DQUOT_FREE_SPACE_NODIRTY(inode, nr);
154	mark_inode_dirty(inode);
155	}
156
157	static __inline__ void DQUOT_FREE_INODE(struct inode *inode)
158	{
159	if (sb_any_quota_enabled(inode->i_sb))
160	inode->i_sb->dq_op->free_inode(inode, 1);
161	}
162
163	static __inline__ int DQUOT_TRANSFER(struct inode inode, struct iattr iattr)
164	{
165	if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode)) {
166	DQUOT_INIT(inode);
167	if (inode->i_sb->dq_op->transfer(inode, iattr) == NO_QUOTA)
168	return 1;
169	}
170	return 0;
171	}
172
173	/* The following two functions cannot be called inside a transaction */
174	#define DQUOT_SYNC(sb) sync_dquots(sb, -1)
175
176	static __inline__ int DQUOT_OFF(struct super_block *sb)
177	{
178	int ret = -ENOSYS;
179
180	if (sb_any_quota_enabled(sb) && sb->s_qcop && sb->s_qcop->quota_off)
181	ret = sb->s_qcop->quota_off(sb, -1);
182	return ret;
183	}
184
185	#else
186
187	/*
188	* NO-OP when quota not configured.
189	*/
190	#define sb_dquot_ops (NULL)
191	#define sb_quotactl_ops (NULL)
1da177e4 LT	192	#define DQUOT_INIT(inode) do { } while(0)
	193	#define DQUOT_DROP(inode) do { } while(0)
	194	#define DQUOT_ALLOC_INODE(inode) (0)
	195	#define DQUOT_FREE_INODE(inode) do { } while(0)
	196	#define DQUOT_SYNC(sb) do { } while(0)
	197	#define DQUOT_OFF(sb) do { } while(0)
	198	#define DQUOT_TRANSFER(inode, iattr) (0)
be586bab	199	static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
1da177e4 LT	200	{
	201	inode_add_bytes(inode, nr);
	202	return 0;
	203	}
	204
be586bab	205	static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
1da177e4 LT	206	{
	207	DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
	208	mark_inode_dirty(inode);
	209	return 0;
	210	}
	211
be586bab	212	static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
1da177e4 LT	213	{
	214	inode_add_bytes(inode, nr);
	215	return 0;
	216	}
	217
be586bab	218	static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
1da177e4 LT	219	{
	220	DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
	221	mark_inode_dirty(inode);
	222	return 0;
	223	}
	224
be586bab	225	static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
1da177e4 LT	226	{
	227	inode_sub_bytes(inode, nr);
	228	}
	229
be586bab	230	static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
1da177e4 LT	231	{
	232	DQUOT_FREE_SPACE_NODIRTY(inode, nr);
	233	mark_inode_dirty(inode);
	234	}
	235
	236	#endif /* CONFIG_QUOTA */
	237
	238	#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_PREALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	239	#define DQUOT_PREALLOC_BLOCK(inode, nr) DQUOT_PREALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	240	#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) DQUOT_ALLOC_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	241	#define DQUOT_ALLOC_BLOCK(inode, nr) DQUOT_ALLOC_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	242	#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) DQUOT_FREE_SPACE_NODIRTY(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	243	#define DQUOT_FREE_BLOCK(inode, nr) DQUOT_FREE_SPACE(inode, ((qsize_t)(nr)) << (inode)->i_sb->s_blocksize_bits)
	244
	245	#endif /* _LINUX_QUOTAOPS_ */