LXR linux/include/linux/quotaops.h

   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
  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 */
  22extern void sync_dquots(struct super_block *sb, int type);
  23
  24extern int dquot_initialize(struct inode *inode, int type);
  25extern int dquot_drop(struct inode *inode);
  26
  27extern int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  28extern int dquot_alloc_inode(const struct inode *inode, unsigned long number);
  29
  30extern int dquot_free_space(struct inode *inode, qsize_t number);
  31extern int dquot_free_inode(const struct inode *inode, unsigned long number);
  32
  33extern int dquot_transfer(struct inode *inode, struct iattr *iattr);
  34extern int dquot_commit(struct dquot *dquot);
  35extern int dquot_acquire(struct dquot *dquot);
  36extern int dquot_release(struct dquot *dquot);
  37extern int dquot_commit_info(struct super_block *sb, int type);
  38extern int dquot_mark_dquot_dirty(struct dquot *dquot);
  39
  40extern int vfs_quota_on(struct super_block *sb, int type, int format_id,
  41                char *path, int remount);
  42extern int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  43                int format_id, int type);
  44extern int vfs_quota_off(struct super_block *sb, int type, int remount);
  45extern int vfs_quota_sync(struct super_block *sb, int type);
  46extern int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  47extern int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  48extern int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  49extern 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 */
  54extern struct dquot_operations dquot_operations;
  55extern 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. */
  62static 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 */
  70static 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) */
  93static 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
 105static 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
 113static 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
 125static 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
 133static 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
 143static 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
 151static 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
 157static 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
 163static 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 */
 174static inline void DQUOT_SYNC(struct super_block *sb)
 175{
 176        sync_dquots(sb, -1);
 177}
 178
 179static inline int DQUOT_OFF(struct super_block *sb, int remount)
 180{
 181        int ret = -ENOSYS;
 182
 183        if (sb->s_qcop && sb->s_qcop->quota_off)
 184                ret = sb->s_qcop->quota_off(sb, -1, remount);
 185        return ret;
 186}
 187
 188static inline int DQUOT_ON_REMOUNT(struct super_block *sb)
 189{
 190        int cnt;
 191        int ret = 0, err;
 192
 193        if (!sb->s_qcop || !sb->s_qcop->quota_on)
 194                return -ENOSYS;
 195        for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 196                err = sb->s_qcop->quota_on(sb, cnt, 0, NULL, 1);
 197                if (err < 0 && !ret)
 198                        ret = err;
 199        }
 200        return ret;
 201}
 202
 203#else
 204
 205/*
 206 * NO-OP when quota not configured.
 207 */
 208#define sb_dquot_ops                            (NULL)
 209#define sb_quotactl_ops                         (NULL)
 210
 211static inline void DQUOT_INIT(struct inode *inode)
 212{
 213}
 214
 215static inline void DQUOT_DROP(struct inode *inode)
 216{
 217}
 218
 219static inline int DQUOT_ALLOC_INODE(struct inode *inode)
 220{
 221        return 0;
 222}
 223
 224static inline void DQUOT_FREE_INODE(struct inode *inode)
 225{
 226}
 227
 228static inline void DQUOT_SYNC(struct super_block *sb)
 229{
 230}
 231
 232static inline int DQUOT_OFF(struct super_block *sb, int remount)
 233{
 234        return 0;
 235}
 236
 237static inline int DQUOT_ON_REMOUNT(struct super_block *sb)
 238{
 239        return 0;
 240}
 241
 242static inline int DQUOT_TRANSFER(struct inode *inode, struct iattr *iattr)
 243{
 244        return 0;
 245}
 246
 247static inline int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 248{
 249        inode_add_bytes(inode, nr);
 250        return 0;
 251}
 252
 253static inline int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
 254{
 255        DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
 256        mark_inode_dirty(inode);
 257        return 0;
 258}
 259
 260static inline int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 261{
 262        inode_add_bytes(inode, nr);
 263        return 0;
 264}
 265
 266static inline int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
 267{
 268        DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
 269        mark_inode_dirty(inode);
 270        return 0;
 271}
 272
 273static inline void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
 274{
 275        inode_sub_bytes(inode, nr);
 276}
 277
 278static inline void DQUOT_FREE_SPACE(struct inode *inode, qsize_t nr)
 279{
 280        DQUOT_FREE_SPACE_NODIRTY(inode, nr);
 281        mark_inode_dirty(inode);
 282}       
 283
 284#endif /* CONFIG_QUOTA */
 285
 286static inline int DQUOT_PREALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 287{
 288        return DQUOT_PREALLOC_SPACE_NODIRTY(inode,
 289                        nr << inode->i_sb->s_blocksize_bits);
 290}
 291
 292static inline int DQUOT_PREALLOC_BLOCK(struct inode *inode, qsize_t nr)
 293{
 294        return DQUOT_PREALLOC_SPACE(inode,
 295                        nr << inode->i_sb->s_blocksize_bits);
 296}
 297
 298static inline int DQUOT_ALLOC_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 299{
 300        return DQUOT_ALLOC_SPACE_NODIRTY(inode,
 301                        nr << inode->i_sb->s_blocksize_bits);
 302}
 303
 304static inline int DQUOT_ALLOC_BLOCK(struct inode *inode, qsize_t nr)
 305{
 306        return DQUOT_ALLOC_SPACE(inode,
 307                        nr << inode->i_sb->s_blocksize_bits);
 308}
 309
 310static inline void DQUOT_FREE_BLOCK_NODIRTY(struct inode *inode, qsize_t nr)
 311{
 312        DQUOT_FREE_SPACE_NODIRTY(inode, nr << inode->i_sb->s_blocksize_bits);
 313}
 314
 315static inline void DQUOT_FREE_BLOCK(struct inode *inode, qsize_t nr)
 316{
 317        DQUOT_FREE_SPACE(inode, nr << inode->i_sb->s_blocksize_bits);
 318}
 319
 320#endif /* _LINUX_QUOTAOPS_ */
 321