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 /*
  18  * declaration of quota_function calls in kernel.
  19  */
  20 extern void dquot_initialize(struct inode *inode, short type);
  21 extern void dquot_drop(struct inode *inode);
  22 extern void invalidate_dquots(kdev_t dev, short type);
  23 extern int  quota_off(kdev_t dev, short type);
  24 extern int  sync_dquots(kdev_t dev, short type);
  25
  26 extern int  dquot_alloc_block(const struct inode *inode, unsigned long number,
  27                               uid_t initiator, char warn);
  28 extern int  dquot_alloc_inode(const struct inode *inode, unsigned long number,
  29                               uid_t initiator);
  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 inode *inode, struct iattr *iattr,
  35                            char direction, uid_t initiator);
  36
  37 /*
  38  * Operations supported for diskquotas.
  39  */
  40 extern __inline__ void DQUOT_INIT(struct inode *inode)
  41 {
  42         if (inode->i_sb && inode->i_sb->dq_op)
  43                 inode->i_sb->dq_op->initialize(inode, -1);
  44 }
  45
  46 extern __inline__ void DQUOT_DROP(struct inode *inode)
  47 {
  48         if (IS_QUOTAINIT(inode)) {
  49                 if (inode->i_sb && inode->i_sb->dq_op)
  50                         inode->i_sb->dq_op->drop(inode);
  51         }
  52 }
  53
  54 extern __inline__ int DQUOT_PREALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  55 {
  56         if (sb->dq_op) {
  57                 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize),
  58                                            current->fsuid, 0) == NO_QUOTA)
  59                         return 1;
  60         }
  61         return 0;
  62 }
  63
  64 extern __inline__ int DQUOT_ALLOC_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  65 {
  66         if (sb->dq_op) {
  67                 if (sb->dq_op->alloc_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize),
  68                                            current->fsuid, 1) == NO_QUOTA)
  69                         return 1;
  70         }
  71         return 0;
  72 }
  73
  74 extern __inline__ int DQUOT_ALLOC_INODE(struct super_block *sb, struct inode *inode)
  75 {
  76         if (sb->dq_op) {
  77                 sb->dq_op->initialize (inode, -1);
  78                 if (sb->dq_op->alloc_inode (inode, 1, current->fsuid))
  79                         return 1;
  80         }
  81         inode->i_flags |= S_QUOTA;
  82         return 0;
  83 }
  84
  85 extern __inline__ void DQUOT_FREE_BLOCK(struct super_block *sb, const struct inode *inode, int nr)
  86 {
  87         if (sb->dq_op)
  88                 sb->dq_op->free_block(inode, fs_to_dq_blocks(nr, sb->s_blocksize));
  89 }
  90
  91 extern __inline__ void DQUOT_FREE_INODE(struct super_block *sb, struct inode *inode)
  92 {
  93         if (sb->dq_op)
  94                 sb->dq_op->free_inode(inode, 1);
  95 }
  96
  97 extern __inline__ int DQUOT_TRANSFER(struct dentry *dentry, struct iattr *iattr)
  98 {
  99         int error = -EDQUOT;
 100
 101         if (dentry->d_inode->i_sb->dq_op) {
 102                 if (IS_QUOTAINIT(dentry->d_inode) == 0)
 103                         dentry->d_inode->i_sb->dq_op->initialize(dentry->d_inode, -1);
 104                 if (dentry->d_inode->i_sb->dq_op->transfer(dentry->d_inode, iattr, 0, current->fsuid))
 105                         goto out;
 106                 error = notify_change(dentry, iattr);
 107                 if (error)
 108                         dentry->d_inode->i_sb->dq_op->transfer(dentry->d_inode, iattr, 1, current->fsuid);
 109         } else {
 110                 error = notify_change(dentry, iattr);
 111         }
 112 out:
 113         return error;
 114 }
 115
 116 #define DQUOT_SYNC(dev) sync_dquots(dev, -1)
 117 #define DQUOT_OFF(dev)  quota_off(dev, -1)
 118
 119 #else
 120
 121 /*
 122  * NO-OP when quota not configured.
 123  */
 124 #define DQUOT_INIT(inode)                       do { } while(0)
 125 #define DQUOT_DROP(inode)                       do { } while(0)
 126 #define DQUOT_PREALLOC_BLOCK(sb, inode, nr)     (0)
 127 #define DQUOT_ALLOC_BLOCK(sb, inode, nr)        (0)
 128 #define DQUOT_ALLOC_INODE(sb, inode)            (0)
 129 #define DQUOT_FREE_BLOCK(sb, inode, nr)         do { } while(0)
 130 #define DQUOT_FREE_INODE(sb, inode)             do { } while(0)
 131 #define DQUOT_SYNC(dev)                         do { } while(0)
 132 #define DQUOT_OFF(dev)                          do { } while(0)
 133
 134 /*
 135  * Special case expands to a simple notify_change.
 136  */
 137 #define DQUOT_TRANSFER(dentry, iattr) notify_change(dentry, iattr)
 138
 139 #endif /* CONFIG_QUOTA */
 140 #endif /* _LINUX_QUOTAOPS_ */