ext4: lookup block mapping in extent status tree

[deliverable/linux.git] / fs / ext4 / extents_status.h

diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index 077f82db092a215095c26bfca10515edd9c9ac6c..8ffc90c784fac340190366cfe0cb3057fbcbbd6c 100644 (file)
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -20,10 +20,21 @@
 #define es_debug(fmt, ...)     no_printk(fmt, ##__VA_ARGS__)
 #endif
 
+#define EXTENT_STATUS_WRITTEN  0x80000000      /* written extent */
+#define EXTENT_STATUS_UNWRITTEN        0x40000000      /* unwritten extent */
+#define EXTENT_STATUS_DELAYED  0x20000000      /* delayed extent */
+#define EXTENT_STATUS_HOLE     0x10000000      /* hole */
+
+#define EXTENT_STATUS_FLAGS    (EXTENT_STATUS_WRITTEN | \
+                                EXTENT_STATUS_UNWRITTEN | \
+                                EXTENT_STATUS_DELAYED | \
+                                EXTENT_STATUS_HOLE)
+
 struct extent_status {
        struct rb_node rb_node;
-       ext4_lblk_t start;      /* first block extent covers */
-       ext4_lblk_t len;        /* length of extent in block */
+       ext4_lblk_t es_lblk;    /* first logical block extent covers */
+       ext4_lblk_t es_len;     /* length of extent in block */
+       ext4_fsblk_t es_pblk;   /* first physical block */
 };
 
 struct ext4_es_tree {
@@ -35,11 +46,64 @@ extern int __init ext4_init_es(void);
 extern void ext4_exit_es(void);
 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
 
-extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t start,
+extern int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
+                                ext4_lblk_t len, ext4_fsblk_t pblk,
+                                unsigned long long status);
+extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t lblk,
                                 ext4_lblk_t len);
-extern int ext4_es_remove_extent(struct inode *inode, ext4_lblk_t start,
-                                ext4_lblk_t len);
-extern ext4_lblk_t ext4_es_find_extent(struct inode *inode,
-                               struct extent_status *es);
+extern void ext4_es_find_delayed_extent(struct inode *inode, ext4_lblk_t lblk,
+                                       struct extent_status *es);
+extern int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
+                                struct extent_status *es);
+
+static inline int ext4_es_is_written(struct extent_status *es)
+{
+       return (es->es_pblk & EXTENT_STATUS_WRITTEN);
+}
+
+static inline int ext4_es_is_unwritten(struct extent_status *es)
+{
+       return (es->es_pblk & EXTENT_STATUS_UNWRITTEN);
+}
+
+static inline int ext4_es_is_delayed(struct extent_status *es)
+{
+       return (es->es_pblk & EXTENT_STATUS_DELAYED);
+}
+
+static inline int ext4_es_is_hole(struct extent_status *es)
+{
+       return (es->es_pblk & EXTENT_STATUS_HOLE);
+}
+
+static inline ext4_fsblk_t ext4_es_status(struct extent_status *es)
+{
+       return (es->es_pblk & EXTENT_STATUS_FLAGS);
+}
+
+static inline ext4_fsblk_t ext4_es_pblock(struct extent_status *es)
+{
+       return (es->es_pblk & ~EXTENT_STATUS_FLAGS);
+}
+
+static inline void ext4_es_store_pblock(struct extent_status *es,
+                                       ext4_fsblk_t pb)
+{
+       ext4_fsblk_t block;
+
+       block = (pb & ~EXTENT_STATUS_FLAGS) |
+               (es->es_pblk & EXTENT_STATUS_FLAGS);
+       es->es_pblk = block;
+}
+
+static inline void ext4_es_store_status(struct extent_status *es,
+                                       unsigned long long status)
+{
+       ext4_fsblk_t block;
+
+       block = (status & EXTENT_STATUS_FLAGS) |
+               (es->es_pblk & ~EXTENT_STATUS_FLAGS);
+       es->es_pblk = block;
+}
 
 #endif /* _EXT4_EXTENTS_STATUS_H */