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/config.h>
  14
  15 #if defined(CONFIG_QUOTA)
  16
  17 #include <linux/smp_lock.h>
  18
  19 /*
  20  * declaration of quota_function calls in kernel.
  21  */
  22 extern void dquot_initialize(struct inode *inode, short type);
  23 extern void dquot_drop(struct inode *inode);
  24 extern void invalidate_dquots(kdev_t dev, short type);
  25 extern int  quota_off(struct super_block *sb, short type);
  26 extern int  sync_dquots(kdev_t dev, short type);
  27
  28 extern int  dquot_alloc_block(const struct inode *inode, unsigned long number, char prealloc);
  29 extern int  dquot_alloc_inode(const struct inode *inode, unsigned long number);
  30
  31 extern void dquot_free_block(const struct inode *inode, unsigned long number);
  32 extern void dquot_free_inode(const struct inode *inode, unsigned long number);
  33
  34 extern int  dquot_transfer(struct dentry *dentry, struct iattr *iattr);
  35
  36 /*
  37  * Operations supported for diskquotas.
  38  */
  39 extern __inline__ void DQUOT_INIT(struct inode *inode)
  40 {
  41         if (inode->i_sb && inode->i_sb->dq_op)
  42                 inode->i_sb->dq_op->initialize(inode, -1);
  43 }
  44
  45 extern __inline__ void DQUOT_DROP(struct inode *inode)
  46 {
  47         if (IS_QUOTAINIT(inode)) {
  48                 if (inode->i_sb && inode->i_sb->dq_op)
  49                         inode->i_sb->dq_op->drop(inode);
  50         }
  51 }
  52
  53 extern __inline__ int DQUOT_PREALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  54 {
  55         if (sb->dq_op) {
  56                 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize), 1) == NO_QUOTA)
  57                         return 1;
  58         }
  59         return 0;
  60 }
  61
  62 extern __inline__ int DQUOT_ALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  63 {
  64         if (sb->dq_op) {
  65                 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize), 0) == NO_QUOTA)
  66                         return 1;
  67         }
  68         return 0;
  69 }
  70
  71 extern __inline__ int DQUOT_ALLOC_INODE(struct super_block *sb, struct inode *inode)
  72 {
  73         if (sb->dq_op) {
  74                 sb->dq_op->initialize (inode, -1);
  75                 if (sb->dq_op->alloc_inode (inode, 1))
  76                         return 1;
  77         }
  78         inode->i_flags |= S_QUOTA;
  79         return 0;
  80 }
  81
  82 extern __inline__ void DQUOT_FREE_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  83 {
  84         if (sb->dq_op)
  85                 sb->dq_op->free_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize));
  86 }
  87
  88 extern __inline__ void DQUOT_FREE_INODE(struct super_block *sb, struct inode *inode)
  89 {
  90         if (sb->dq_op)
  91                 sb->dq_op->free_inode(inode, 1);
  92 }
  93
  94 extern __inline__ int DQUOT_TRANSFER(struct dentry *dentry, struct iattr *iattr)
  95 {
  96         int error = -EDQUOT;
  97
  98         if (dentry->d_inode->i_sb->dq_op) {
  99                 dentry->d_inode->i_sb->dq_op->initialize(dentry->d_inode, -1);
 100                 error = dentry->d_inode->i_sb->dq_op->transfer(dentry, iattr);
 101         } else {
 102                 error = notify_change(dentry, iattr);
 103         }
 104         return error;
 105 }
 106
 107 #define DQUOT_SYNC(dev) sync_dquots(dev, -1)
 108 #define DQUOT_OFF(sb)   quota_off(sb, -1)
 109
 110 #else
 111
 112 /*
 113  * NO-OP when quota not configured.
 114  */
 115 #define DQUOT_INIT(inode)                       do { } while(0)
 116 #define DQUOT_DROP(inode)                       do { } while(0)
 117 #define DQUOT_PREALLOC_BLOCK(sb, inode, nr)     (0)
 118 #define DQUOT_ALLOC_BLOCK(sb, inode, nr)        (0)
 119 #define DQUOT_ALLOC_INODE(sb, inode)            (0)
 120 #define DQUOT_FREE_BLOCK(sb, inode, nr)         do { } while(0)
 121 #define DQUOT_FREE_INODE(sb, inode)             do { } while(0)
 122 #define DQUOT_SYNC(dev)                         do { } while(0)
 123 #define DQUOT_OFF(sb)                           do { } while(0)
 124
 125 /*
 126  * Special case expands to a simple notify_change.
 127  */
 128 #define DQUOT_TRANSFER(dentry, iattr) notify_change(dentry, iattr)
 129
 130 #endif /* CONFIG_QUOTA */
 131 #endif /* _LINUX_QUOTAOPS_ */