1 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/dqblk_qtree.h b/include/linux/dqblk_qtree.h
new file mode 100644
index 000000000000..82a16527b367
--- /dev/null
+++ b/include/linux/dqblk_qtree.h
@@ -0,0 +1,56 @@
+/*
+ *      Definitions of structures and functions for quota formats using trie
+ */
+
+#ifndef _LINUX_DQBLK_QTREE_H
+#define _LINUX_DQBLK_QTREE_H
+
+#include <linux/types.h>
+
+/* Numbers of blocks needed for updates - we count with the smallest
+ * possible block size (1024) */
+#define QTREE_INIT_ALLOC 4
+#define QTREE_INIT_REWRITE 2
+#define QTREE_DEL_ALLOC 0
+#define QTREE_DEL_REWRITE 6
+
+struct dquot;
+
+/* Operations */
+struct qtree_fmt_operations {
+        void (*mem2disk_dqblk)(void *disk, struct dquot *dquot);        /* Convert given entry from in memory format to disk one */
+        void (*disk2mem_dqblk)(struct dquot *dquot, void *disk);        /* Convert given entry from disk format to in memory one */
+        int (*is_id)(void *disk, struct dquot *dquot);  /* Is this structure for given id? */
+};
+
+/* Inmemory copy of version specific information */
+struct qtree_mem_dqinfo {
+        struct super_block *dqi_sb;     /* Sb quota is on */
+        int dqi_type;                   /* Quota type */
+        unsigned int dqi_blocks;        /* # of blocks in quota file */
+        unsigned int dqi_free_blk;      /* First block in list of free blocks */
+        unsigned int dqi_free_entry;    /* First block with free entry */
+        unsigned int dqi_blocksize_bits;        /* Block size of quota file */
+        unsigned int dqi_entry_size;    /* Size of quota entry in quota file */
+        unsigned int dqi_usable_bs;     /* Space usable in block for quota data */
+        unsigned int dqi_qtree_depth;   /* Precomputed depth of quota tree */
+        struct qtree_fmt_operations *dqi_ops;   /* Operations for entry manipulation */
+};
+
+int qtree_write_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
+int qtree_read_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
+int qtree_delete_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
+int qtree_release_dquot(struct qtree_mem_dqinfo *info, struct dquot *dquot);
+int qtree_entry_unused(struct qtree_mem_dqinfo *info, char *disk);
+static inline int qtree_depth(struct qtree_mem_dqinfo *info)
+{
+        unsigned int epb = info->dqi_usable_bs >> 2;
+        unsigned long long entries = epb;
+        int i;
+
+        for (i = 1; entries < (1ULL << 32); i++)
+                entries *= epb;
+        return i;
+}
+
+#endif /* _LINUX_DQBLK_QTREE_H */