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Message-Id: <11870005502857-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 13 Aug 2007 15:52:22 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: alex@...sterfs.com
Cc: linux-ext4@...r.kernel.org, Alex Tomas <alex@...sterfs.com>
Subject: [PATCH 1/4] Add some new function for searching extent tree.
From: Alex Tomas <alex@...sterfs.com>
ext4_ext_search_left
ext4_ext_search_right
---
fs/ext4/extents.c | 142 +++++++++++++++++++++++++++++++++++++++
include/linux/ext4_fs_extents.h | 2 +
2 files changed, 144 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 78beb09..3084e09 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1015,6 +1015,148 @@ out:
}
/*
+ * search the closest allocated block to the left for *logical
+ * and returns it at @logical + it's physical address at @phys
+ * if *logical is the smallest allocated block, the function
+ * returns 0 at @phys
+ * return value contains 0 (success) or error code
+ */
+int
+ext4_ext_search_left(struct inode *inode, struct ext4_ext_path *path,
+ ext4_fsblk_t *logical, ext4_fsblk_t *phys)
+{
+ struct ext4_extent_idx *ix;
+ struct ext4_extent *ex;
+ int depth;
+
+ BUG_ON(path == NULL);
+ depth = path->p_depth;
+ *phys = 0;
+
+ if (depth == 0 && path->p_ext == NULL)
+ return 0;
+
+ /* usually extent in the path covers blocks smaller
+ * then *logical, but it can be that extent is the
+ * first one in the file */
+
+ ex = path[depth].p_ext;
+ if (*logical < le32_to_cpu(ex->ee_block)) {
+ BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
+ }
+ return 0;
+ }
+
+ BUG_ON(*logical < le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len));
+
+ *logical = le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len) - 1;
+ *phys = ext_pblock(ex) + le16_to_cpu(ex->ee_len) - 1;
+ return 0;
+}
+
+/*
+ * search the closest allocated block to the right for *logical
+ * and returns it at @logical + it's physical address at @phys
+ * if *logical is the smallest allocated block, the function
+ * returns 0 at @phys
+ * return value contains 0 (success) or error code
+ */
+int
+ext4_ext_search_right(struct inode *inode, struct ext4_ext_path *path,
+ ext4_fsblk_t *logical, ext4_fsblk_t *phys)
+{
+ struct buffer_head *bh = NULL;
+ struct ext4_extent_header *eh;
+ struct ext4_extent_idx *ix;
+ struct ext4_extent *ex;
+ ext4_fsblk_t block;
+ int depth;
+
+ BUG_ON(path == NULL);
+ depth = path->p_depth;
+ *phys = 0;
+
+ if (depth == 0 && path->p_ext == NULL)
+ return 0;
+
+ /* usually extent in the path covers blocks smaller
+ * then *logical, but it can be that extent is the
+ * first one in the file */
+
+ ex = path[depth].p_ext;
+ if (*logical < le32_to_cpu(ex->ee_block)) {
+ BUG_ON(EXT_FIRST_EXTENT(path[depth].p_hdr) != ex);
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ BUG_ON(ix != EXT_FIRST_INDEX(path[depth].p_hdr));
+ }
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ return 0;
+ }
+
+ BUG_ON(*logical < le32_to_cpu(ex->ee_block) + le16_to_cpu(ex->ee_len));
+
+ if (ex != EXT_LAST_EXTENT(path[depth].p_hdr)) {
+ /* next allocated block in this leaf */
+ ex++;
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ return 0;
+ }
+
+ /* go up and search for index to the right */
+ while (--depth >= 0) {
+ ix = path[depth].p_idx;
+ if (ix != EXT_LAST_INDEX(path[depth].p_hdr))
+ break;
+ }
+
+ if (depth < 0) {
+ /* we've gone up to the root and
+ * found no index to the right */
+ return 0;
+ }
+
+ /* we've found index to the right, let's
+ * follow it and find the closest allocated
+ * block to the right */
+ ix++;
+ block = idx_pblock(ix);
+ while (++depth < path->p_depth) {
+ bh = sb_bread(inode->i_sb, block);
+ if (bh == NULL)
+ return -EIO;
+ eh = ext_block_hdr(bh);
+ if (ext4_ext_check_header(inode, eh, depth)) {
+ brelse(bh);
+ return -EIO;
+ }
+ ix = EXT_FIRST_INDEX(eh);
+ block = idx_pblock(ix);
+ brelse(bh);
+ }
+
+ bh = sb_bread(inode->i_sb, block);
+ if (bh == NULL)
+ return -EIO;
+ eh = ext_block_hdr(bh);
+ if (ext4_ext_check_header(inode, eh, depth)) {
+ brelse(bh);
+ return -EIO;
+ }
+ ex = EXT_FIRST_EXTENT(eh);
+ *logical = le32_to_cpu(ex->ee_block);
+ *phys = ext_pblock(ex);
+ brelse(bh);
+ return 0;
+
+}
+
+/*
* ext4_ext_next_allocated_block:
* returns allocated block in subsequent extent or EXT_MAX_BLOCK.
* NOTE: it considers block number from index entry as
diff --git a/include/linux/ext4_fs_extents.h b/include/linux/ext4_fs_extents.h
index 81406f3..5ed0891 100644
--- a/include/linux/ext4_fs_extents.h
+++ b/include/linux/ext4_fs_extents.h
@@ -236,5 +236,7 @@ extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_pa
extern int ext4_ext_walk_space(struct inode *, unsigned long, unsigned long, ext_prepare_callback, void *);
extern struct ext4_ext_path * ext4_ext_find_extent(struct inode *, int, struct ext4_ext_path *);
+extern int ext4_ext_search_left(struct inode *, struct ext4_ext_path *, ext4_fsblk_t *, ext4_fsblk_t *);
+extern int ext4_ext_search_right(struct inode *, struct ext4_ext_path *, ext4_fsblk_t *, ext4_fsblk_t *);
#endif /* _LINUX_EXT4_EXTENTS */
--
1.5.3.rc4.67.gf9286-dirty
-
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