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Date: Thu, 21 Jun 2007 10:54:43 +0900
From: "Takashi Sato" <t-sato@...jp.nec.com>
To: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [RFC][PATCH 6/10] Move files from target block group to other block group
- To make contiguous free blocks, move files from the target block group
to other block group.
Signed-off-by: Takashi Sato <t-sato@...jp.nec.com>
Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
---
diff -X Online-Defrag_linux-2.6.19-rc6-git/Documentation/dontdiff -upNr Online-Defrag_linux-2.6.19-rc6-git-MOVE_VICTIM/fs/ext4/extents.c Online-Defrag_linux-2.6.19-rc6-git-RESERVE_BLOCK/fs/ext4/extents.c
--- Online-Defrag_linux-2.6.19-rc6-git-MOVE_VICTIM/fs/ext4/extents.c 2007-06-20 08:27:44.000000000 +0900
+++ Online-Defrag_linux-2.6.19-rc6-git-RESERVE_BLOCK/fs/ext4/extents.c 2007-06-19 21:40:55.000000000 +0900
@@ -1279,20 +1279,20 @@ ext4_can_extents_be_merged(struct inode
}
/*
- * ext4_ext_insert_extent:
- * tries to merge requsted extent into the existing extent or
- * inserts requested extent as new one into the tree,
- * creating new leaf in the no-space case.
+ * ext4_ext_insert_extent_defrag:
+ * The difference from ext4_ext_insert_extent is to use the first block
+ * in newext as the goal of the new index block.
*/
-int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
+int ext4_ext_insert_extent_defrag(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
- struct ext4_extent *newext)
+ struct ext4_extent *newext, int defrag)
{
struct ext4_extent_header * eh;
struct ext4_extent *ex, *fex;
struct ext4_extent *nearex; /* nearest extent */
struct ext4_ext_path *npath = NULL;
int depth, len, err, next;
+ ext4_fsblk_t defrag_goal;
BUG_ON(newext->ee_len == 0);
depth = ext_depth(inode);
@@ -1342,11 +1342,17 @@ repeat:
le16_to_cpu(eh->eh_entries), le16_to_cpu(eh->eh_max));
}
+ if (defrag) {
+ defrag_goal = ext_pblock(newext);
+ } else {
+ defrag_goal = 0;
+ }
/*
* There is no free space in the found leaf.
* We're gonna add a new leaf in the tree.
*/
- err = ext4_ext_create_new_leaf(handle, inode, path, newext);
+ err = ext4_ext_create_new_leaf(handle, inode, path,
+ newext, defrag_goal);
if (err)
goto cleanup;
depth = ext_depth(inode);
@@ -1438,6 +1444,19 @@ cleanup:
return err;
}
+/*
+ * ext4_ext_insert_extent:
+ * tries to merge requsted extent into the existing extent or
+ * inserts requested extent as new one into the tree,
+ * creating new leaf in the no-space case.
+ */
+int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
+ struct ext4_ext_path *path,
+ struct ext4_extent *newext)
+{
+ return ext4_ext_insert_extent_defrag(handle, inode, path, newext, 0);
+}
+
int ext4_ext_walk_space(struct inode *inode, unsigned long block,
unsigned long num, ext_prepare_callback func,
void *cbdata)
@@ -2600,6 +2619,70 @@ out:
}
/**
+ * ext4_ext_defrag_victim - Create free space for defrag
+ * @filp target file
+ * @ex_info target extents array to move
+ *
+ * This function returns 0 if succeeded, otherwise
+ * returns error value
+ */
+static int ext4_ext_defrag_victim(struct file *target_filp,
+ struct ext4_extents_info *ex_info)
+{
+ struct inode *target_inode = target_filp->f_dentry->d_inode;
+ struct super_block *sb = target_inode->i_sb;
+ struct file victim_file;
+ struct dentry victim_dent;
+ struct inode *victim_inode;
+ ext4_fsblk_t goal = ex_info->goal;
+ int ret = 0;
+ int i = 0;
+ int flag = DEFRAG_RESERVE_BLOCKS_SECOND;
+ struct ext4_extent_data ext;
+ unsigned long group;
+ ext4_grpblk_t grp_off;
+
+ /* Setup dummy entent data */
+ ext.len = 0;
+
+ /* Get the inode of the victim file */
+ victim_inode = iget(sb, ex_info->ino);
+ if (!victim_inode)
+ return -EACCES;
+
+ /* Setup file for the victim file */
+ victim_dent.d_inode = victim_inode;
+ victim_file.f_dentry = &victim_dent;
+
+ /* Set the goal appropriate offset */
+ if (goal == -1) {
+ ext4_get_group_no_and_offset(victim_inode->i_sb,
+ ex_info->ext[0].start, &group, &grp_off);
+ goal = ext4_group_first_block_no(sb, group + 1);
+ }
+
+ for (i = 0; i < ex_info->entries; i++ ) {
+ /* Move original blocks to another block group */
+ if ((ret = ext4_ext_defrag(&victim_file, ex_info->ext[i].block,
+ ex_info->ext[i].len, goal, flag, &ext)) < 0)
+ goto ERR;
+
+ /* Sync journal blocks before reservation */
+ if (do_fsync(target_filp, 0))
+ goto ERR;
+ }
+
+ iput(victim_inode);
+ return 0;
+ERR:
+ mutex_lock(&EXT4_I(target_inode)->truncate_mutex);
+ ext4_discard_reservation(target_inode);
+ mutex_unlock(&EXT4_I(target_inode)->truncate_mutex);
+ iput(victim_inode);
+ return ret;
+}
+
+/**
* ext4_ext_fblocks_distribution - Search free block distribution
* @filp target file
* @ex_info ext4_extents_info
@@ -2788,6 +2871,16 @@ int ext4_ext_ioctl(struct inode *inode,
&ext_info, sizeof(ext_info)))
return -EFAULT;
}
+ } else if (cmd == EXT4_IOC_MOVE_VICTIM) {
+ struct ext4_extents_info ext_info;
+
+ if (copy_from_user(&ext_info,
+ (struct ext4_extents_info __user *)arg,
+ sizeof(ext_info)))
+ return -EFAULT;
+
+ err = ext4_ext_defrag_victim(filp, &ext_info);
+
} else if (cmd == EXT4_IOC_DEFRAG) {
struct ext4_ext_defrag_data defrag;
-
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