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#include <linux/fs.h>
  15
  16static inline struct quota_info *sb_dqopt(struct super_block *sb)
  17{
  18        return &sb->s_dquot;
  19}
  20
  21#if defined(CONFIG_QUOTA)
  22
  23/*
  24 * declaration of quota_function calls in kernel.
  25 */
  26void sync_dquots(struct super_block *sb, int type);
  27
  28int dquot_initialize(struct inode *inode, int type);
  29int dquot_drop(struct inode *inode);
  30
  31int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
  32int dquot_alloc_inode(const struct inode *inode, unsigned long number);
  33
  34int dquot_free_space(struct inode *inode, qsize_t number);
  35int dquot_free_inode(const struct inode *inode, unsigned long number);
  36
  37int dquot_transfer(struct inode *inode, struct iattr *iattr);
  38int dquot_commit(struct dquot *dquot);
  39int dquot_acquire(struct dquot *dquot);
  40int dquot_release(struct dquot *dquot);
  41int dquot_commit_info(struct super_block *sb, int type);
  42int dquot_mark_dquot_dirty(struct dquot *dquot);
  43
  44int vfs_quota_on(struct super_block *sb, int type, int format_id,
  45        char *path, int remount);
  46int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
  47        struct path *path);
  48int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
  49        int format_id, int type);
  50int vfs_quota_off(struct super_block *sb, int type, int remount);
  51int vfs_quota_sync(struct super_block *sb, int type);
  52int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  53int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  54int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  55int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
  56
  57void vfs_dq_drop(struct inode *inode);
  58int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
  59int vfs_dq_quota_on_remount(struct super_block *sb);
  60
  61static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  62{
  63        return sb_dqopt(sb)->info + type;
  64}
  65
  66/*
  67 * Functions for checking status of quota
  68 */
  69
  70static inline int sb_has_quota_enabled(struct super_block *sb, int type)
  71{
  72        if (type == USRQUOTA)
  73                return sb_dqopt(sb)->flags & DQUOT_USR_ENABLED;
  74        return sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED;
  75}
  76
  77static inline int sb_any_quota_enabled(struct super_block *sb)
  78{
  79        return sb_has_quota_enabled(sb, USRQUOTA) ||
  80                sb_has_quota_enabled(sb, GRPQUOTA);
  81}
  82
  83static inline int sb_has_quota_suspended(struct super_block *sb, int type)
  84{
  85        if (type == USRQUOTA)
  86                return sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED;
  87        return sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED;
  88}
  89
  90static inline int sb_any_quota_suspended(struct super_block *sb)
  91{
  92        return sb_has_quota_suspended(sb, USRQUOTA) ||
  93                sb_has_quota_suspended(sb, GRPQUOTA);
  94}
  95
  96/*
  97 * Operations supported for diskquotas.
  98 */
  99extern struct dquot_operations dquot_operations;
 100extern struct quotactl_ops vfs_quotactl_ops;
 101
 102#define sb_dquot_ops (&dquot_operations)
 103#define sb_quotactl_ops (&vfs_quotactl_ops)
 104
 105/* It is better to call this function outside of any transaction as it might
 106 * need a lot of space in journal for dquot structure allocation. */
 107static inline void vfs_dq_init(struct inode *inode)
 108{
 109        BUG_ON(!inode->i_sb);
 110        if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
 111                inode->i_sb->dq_op->initialize(inode, -1);
 112}
 113
 114/* The following allocation/freeing/transfer functions *must* be called inside
 115 * a transaction (deadlocks possible otherwise) */
 116static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 117{
 118        if (sb_any_quota_enabled(inode->i_sb)) {
 119                /* Used space is updated in alloc_space() */
 120                if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
 121                        return 1;
 122        }
 123        else
 124                inode_add_bytes(inode, nr);
 125        return 0;
 126}
 127
 128static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 129{
 130        int ret;
 131        if (!(ret =  vfs_dq_prealloc_space_nodirty(inode, nr)))
 132                mark_inode_dirty(inode);
 133        return ret;
 134}
 135
 136static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 137{
 138        if (sb_any_quota_enabled(inode->i_sb)) {
 139                /* Used space is updated in alloc_space() */
 140                if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
 141                        return 1;
 142        }
 143        else
 144                inode_add_bytes(inode, nr);
 145        return 0;
 146}
 147
 148static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 149{
 150        int ret;
 151        if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
 152                mark_inode_dirty(inode);
 153        return ret;
 154}
 155
 156static inline int vfs_dq_alloc_inode(struct inode *inode)
 157{
 158        if (sb_any_quota_enabled(inode->i_sb)) {
 159                vfs_dq_init(inode);
 160                if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
 161                        return 1;
 162        }
 163        return 0;
 164}
 165
 166static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 167{
 168        if (sb_any_quota_enabled(inode->i_sb))
 169                inode->i_sb->dq_op->free_space(inode, nr);
 170        else
 171                inode_sub_bytes(inode, nr);
 172}
 173
 174static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 175{
 176        vfs_dq_free_space_nodirty(inode, nr);
 177        mark_inode_dirty(inode);
 178}
 179
 180static inline void vfs_dq_free_inode(struct inode *inode)
 181{
 182        if (sb_any_quota_enabled(inode->i_sb))
 183                inode->i_sb->dq_op->free_inode(inode, 1);
 184}
 185
 186/* The following two functions cannot be called inside a transaction */
 187static inline void vfs_dq_sync(struct super_block *sb)
 188{
 189        sync_dquots(sb, -1);
 190}
 191
 192static inline int vfs_dq_off(struct super_block *sb, int remount)
 193{
 194        int ret = -ENOSYS;
 195
 196        if (sb->s_qcop && sb->s_qcop->quota_off)
 197                ret = sb->s_qcop->quota_off(sb, -1, remount);
 198        return ret;
 199}
 200
 201#else
 202
 203static inline int sb_has_quota_enabled(struct super_block *sb, int type)
 204{
 205        return 0;
 206}
 207
 208static inline int sb_any_quota_enabled(struct super_block *sb)
 209{
 210        return 0;
 211}
 212
 213static inline int sb_has_quota_suspended(struct super_block *sb, int type)
 214{
 215        return 0;
 216}
 217
 218static inline int sb_any_quota_suspended(struct super_block *sb)
 219{
 220        return 0;
 221}
 222
 223/*
 224 * NO-OP when quota not configured.
 225 */
 226#define sb_dquot_ops                            (NULL)
 227#define sb_quotactl_ops                         (NULL)
 228
 229static inline void vfs_dq_init(struct inode *inode)
 230{
 231}
 232
 233static inline void vfs_dq_drop(struct inode *inode)
 234{
 235}
 236
 237static inline int vfs_dq_alloc_inode(struct inode *inode)
 238{
 239        return 0;
 240}
 241
 242static inline void vfs_dq_free_inode(struct inode *inode)
 243{
 244}
 245
 246static inline void vfs_dq_sync(struct super_block *sb)
 247{
 248}
 249
 250static inline int vfs_dq_off(struct super_block *sb, int remount)
 251{
 252        return 0;
 253}
 254
 255static inline int vfs_dq_quota_on_remount(struct super_block *sb)
 256{
 257        return 0;
 258}
 259
 260static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
 261{
 262        return 0;
 263}
 264
 265static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
 266{
 267        inode_add_bytes(inode, nr);
 268        return 0;
 269}
 270
 271static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
 272{
 273        vfs_dq_prealloc_space_nodirty(inode, nr);
 274        mark_inode_dirty(inode);
 275        return 0;
 276}
 277
 278static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
 279{
 280        inode_add_bytes(inode, nr);
 281        return 0;
 282}
 283
 284static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
 285{
 286        vfs_dq_alloc_space_nodirty(inode, nr);
 287        mark_inode_dirty(inode);
 288        return 0;
 289}
 290
 291static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
 292{
 293        inode_sub_bytes(inode, nr);
 294}
 295
 296static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
 297{
 298        vfs_dq_free_space_nodirty(inode, nr);
 299        mark_inode_dirty(inode);
 300}       
 301
 302#endif /* CONFIG_QUOTA */
 303
 304static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
 305{
 306        return vfs_dq_prealloc_space_nodirty(inode,
 307                        nr << inode->i_sb->s_blocksize_bits);
 308}
 309
 310static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
 311{
 312        return vfs_dq_prealloc_space(inode,
 313                        nr << inode->i_sb->s_blocksize_bits);
 314}
 315
 316static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
 317{
 318        return vfs_dq_alloc_space_nodirty(inode,
 319                        nr << inode->i_sb->s_blocksize_bits);
 320}
 321
 322static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
 323{
 324        return vfs_dq_alloc_space(inode,
 325                        nr << inode->i_sb->s_blocksize_bits);
 326}
 327
 328static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
 329{
 330        vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
 331}
 332
 333static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
 334{
 335        vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
 336}
 337
 338/*
 339 * Define uppercase equivalents for compatibility with old function names
 340 * Can go away when we think all users have been converted (15/04/2008)
 341 */
 342#define DQUOT_INIT(inode) vfs_dq_init(inode)
 343#define DQUOT_DROP(inode) vfs_dq_drop(inode)
 344#define DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr) \
 345                                vfs_dq_prealloc_space_nodirty(inode, nr)
 346#define DQUOT_PREALLOC_SPACE(inode, nr) vfs_dq_prealloc_space(inode, nr)
 347#define DQUOT_ALLOC_SPACE_NODIRTY(inode, nr) \
 348                                vfs_dq_alloc_space_nodirty(inode, nr)
 349#define DQUOT_ALLOC_SPACE(inode, nr) vfs_dq_alloc_space(inode, nr)
 350#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) \
 351                                vfs_dq_prealloc_block_nodirty(inode, nr)
 352#define DQUOT_PREALLOC_BLOCK(inode, nr) vfs_dq_prealloc_block(inode, nr)
 353#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) \
 354                                vfs_dq_alloc_block_nodirty(inode, nr)
 355#define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr)
 356#define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode)
 357#define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \
 358                                vfs_dq_free_space_nodirty(inode, nr)
 359#define DQUOT_FREE_SPACE(inode, nr) vfs_dq_free_space(inode, nr)
 360#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) \
 361                                vfs_dq_free_block_nodirty(inode, nr)
 362#define DQUOT_FREE_BLOCK(inode, nr) vfs_dq_free_block(inode, nr)
 363#define DQUOT_FREE_INODE(inode) vfs_dq_free_inode(inode)
 364#define DQUOT_TRANSFER(inode, iattr) vfs_dq_transfer(inode, iattr)
 365#define DQUOT_SYNC(sb) vfs_dq_sync(sb)
 366#define DQUOT_OFF(sb, remount) vfs_dq_off(sb, remount)
 367#define DQUOT_ON_REMOUNT(sb) vfs_dq_quota_on_remount(sb)
 368
 369#endif /* _LINUX_QUOTAOPS_ */
 370