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authorEric Sandeen <sandeen@redhat.com>2008-10-07 00:46:36 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-07 00:46:36 -0400
commit6873fa0de14e49c433f1f181c54e511f4f3d459d (patch)
tree4759862db403c037c11f570f0b2ca5e25198073e /fs/ext4/ext4_extents.h
parent68c9d702bb72f367f3b148963ec6cf5e07ff7f65 (diff)
downloadop-kernel-dev-6873fa0de14e49c433f1f181c54e511f4f3d459d.zip
op-kernel-dev-6873fa0de14e49c433f1f181c54e511f4f3d459d.tar.gz
Hook ext4 to the vfs fiemap interface.
ext4_ext_walk_space() was reinstated to be used for iterating over file extents with a callback; it is used by the ext4 fiemap implementation. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org
Diffstat (limited to 'fs/ext4/ext4_extents.h')
-rw-r--r--fs/ext4/ext4_extents.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index d33dc56..bec7ce5 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -124,6 +124,19 @@ struct ext4_ext_path {
#define EXT4_EXT_CACHE_GAP 1
#define EXT4_EXT_CACHE_EXTENT 2
+/*
+ * to be called by ext4_ext_walk_space()
+ * negative retcode - error
+ * positive retcode - signal for ext4_ext_walk_space(), see below
+ * callback must return valid extent (passed or newly created)
+ */
+typedef int (*ext_prepare_callback)(struct inode *, struct ext4_ext_path *,
+ struct ext4_ext_cache *,
+ struct ext4_extent *, void *);
+
+#define EXT_CONTINUE 0
+#define EXT_BREAK 1
+#define EXT_REPEAT 2
#define EXT_MAX_BLOCK 0xffffffff
@@ -224,6 +237,8 @@ extern int ext4_ext_try_to_merge(struct inode *inode,
struct ext4_extent *);
extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);
extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *);
+extern int ext4_ext_walk_space(struct inode *, ext4_lblk_t, ext4_lblk_t,
+ ext_prepare_callback, void *);
extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
struct ext4_ext_path *);
extern int ext4_ext_search_left(struct inode *, struct ext4_ext_path *,
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