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-rw-r--r--include/linux/quotaops.h246
1 files changed, 246 insertions, 0 deletions
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
new file mode 100644
index 000000000000..e57baa85e744
--- /dev/null
+++ b/include/linux/quotaops.h
@@ -0,0 +1,246 @@
+/*
+ * 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/config.h>
+#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(int type, int format_id, struct dentry *dentry);
+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 sync_dquots_dev(dev,type) (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)
+extern __inline__ int DQUOT_PREALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
+{
+ inode_add_bytes(inode, nr);
+ return 0;
+}
+
+extern __inline__ int DQUOT_PREALLOC_SPACE(struct inode *inode, qsize_t nr)
+{
+ DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+extern __inline__ int DQUOT_ALLOC_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
+{
+ inode_add_bytes(inode, nr);
+ return 0;
+}
+
+extern __inline__ int DQUOT_ALLOC_SPACE(struct inode *inode, qsize_t nr)
+{
+ DQUOT_ALLOC_SPACE_NODIRTY(inode, nr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+extern __inline__ void DQUOT_FREE_SPACE_NODIRTY(struct inode *inode, qsize_t nr)
+{
+ inode_sub_bytes(inode, nr);
+}
+
+extern __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_ */
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