ext4: online defrag-- Defragmentation for the relevant files (-r mode)
From: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
Relevant file fragmentation could be solved by moving
the files under the specified directory close together with
the block containing the directory data.
Signed-off-by: Akira Fujita <a-fujita@xxxxxxxxxxxxx>
Signed-off-by: Takashi Sato <t-sato@xxxxxxxxxxxxx>
---
fs/ext4/defrag.c | 51 ++++++++++++++++++++++++++++++++++++++++-----------
fs/ext4/ext4.h | 4 +++-
fs/ext4/inode.c | 2 +-
fs/ext4/ioctl.c | 1 +
4 files changed, 45 insertions(+), 13 deletions(-)
diff --git a/fs/ext4/defrag.c b/fs/ext4/defrag.c
index baa04d9..847f708 100644
--- a/fs/ext4/defrag.c
+++ b/fs/ext4/defrag.c
@@ -93,10 +93,23 @@ int ext4_defrag_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
int err = 0;
- if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
+ if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL ||
+ cmd == EXT4_IOC_FIBMAP))
return -EINVAL;
- if (cmd == EXT4_IOC_DEFRAG) {
+ if (cmd == EXT4_IOC_FIBMAP) {
+ ext4_fsblk_t __user *p = (ext4_fsblk_t __user *)arg;
+ ext4_fsblk_t block = 0;
+ struct address_space *mapping = filp->f_mapping;
+
+ if (copy_from_user(&block, (ext4_fsblk_t __user *)arg,
+ sizeof(block)))
+ return -EFAULT;
+
+ block = ext4_bmap(mapping, block);
+
+ return put_user(block, p);
+ } else if (cmd == EXT4_IOC_DEFRAG) {
struct ext4_ext_defrag_data defrag;
if (copy_from_user(&defrag,
@@ -104,7 +117,7 @@ int ext4_defrag_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
sizeof(defrag)))
return -EFAULT;
err = ext4_defrag(filp, defrag.start_offset,
- defrag.defrag_size);
+ defrag.defrag_size, defrag.goal);
}
return err;
@@ -729,13 +742,14 @@ out:
* @org_inode original inode
* @iblock file related offset
* @total_blocks contiguous blocks count
+ * @goal block offset for allocation
*
* If succeed, fuction returns count of extent we got,
* otherwise returns err.
*/
static int ext4_defrag_alloc_blocks(struct inode *dest_inode,
struct inode *org_inode, ext4_lblk_t iblock,
- ext4_fsblk_t total_blocks)
+ ext4_fsblk_t total_blocks, ext4_fsblk_t goal)
{
handle_t *handle = NULL;
struct ext4_ext_path *dest_path = NULL;
@@ -772,7 +786,10 @@ static int ext4_defrag_alloc_blocks(struct inode *dest_inode,
ar.flags = EXT4_MB_HINT_DATA | EXT4_MB_HINT_RESERVED
| EXT4_MB_HINT_NOPREALLOC;
- ar.goal = ext4_ext_find_goal(dest_inode, dest_path, iblock);
+ if (goal)
+ ar.goal = goal;
+ else
+ ar.goal = ext4_ext_find_goal(dest_inode, dest_path, iblock);
ar.logical = iblock;
ar.lleft = 0;
@@ -994,6 +1011,7 @@ out:
* @tar_start: starting offset to allocate in blocks
* @tar_blocks: the number of blocks to allocate
* @iblock: file related offset
+ * @goal: block offset for allocaton
*
* This function returns the value as below:
* 0(succeeded)
@@ -1003,7 +1021,8 @@ out:
static int
ext4_defrag_new_extent_tree(struct inode *inode, struct inode *tmp_inode,
struct ext4_ext_path *path, ext4_lblk_t tar_start,
- ext4_lblk_t tar_blocks, ext4_lblk_t iblock)
+ ext4_lblk_t tar_blocks, ext4_lblk_t iblock,
+ ext4_fsblk_t goal)
{
struct ext4_extent *ext = NULL;
struct ext4_extent_header *eh = NULL;
@@ -1017,7 +1036,7 @@ ext4_defrag_new_extent_tree(struct inode *inode, struct inode *tmp_inode,
/* Allocate contiguous blocks */
sum_tmp = ext4_defrag_alloc_blocks(tmp_inode, inode, iblock,
- tar_blocks);
+ tar_blocks, goal);
if (sum_tmp < 0) {
ret = sum_tmp;
goto out;
@@ -1034,7 +1053,7 @@ ext4_defrag_new_extent_tree(struct inode *inode, struct inode *tmp_inode,
le16_to_cpu(ext->ee_len) - 1 ||
last_extent) {
- if (sum_org == sum_tmp) {
+ if ((sum_org == sum_tmp) && !goal) {
/* Not improved */
ret = ext4_ext_remove_space(tmp_inode, 0);
if (!ret)
@@ -1065,15 +1084,17 @@ out:
* @filp: pointer to file
* @block_start: starting offset to defrag in blocks
* @defrag_size: size of defrag in blocks
+ * @goal: block offset for allocation
*
* This function returns the number of blocks if succeeded, otherwise
* returns error value.
*/
int
ext4_defrag(struct file *filp, ext4_lblk_t block_start,
- ext4_lblk_t defrag_size)
+ ext4_lblk_t defrag_size, ext4_fsblk_t goal)
{
struct inode *inode = filp->f_dentry->d_inode, *tmp_inode = NULL;
+ struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
struct ext4_ext_path *path = NULL, *holecheck_path = NULL;
struct ext4_extent *ext_prev = NULL, *ext_cur = NULL, *ext_dummy = NULL;
handle_t *handle;
@@ -1098,6 +1119,14 @@ ext4_defrag(struct file *filp, ext4_lblk_t block_start,
return -EINVAL;
}
+ /* Check goal offset if goal offset was given from userspace */
+ if (((0 < goal) && (ext4_blocks_count(es) < goal)) && (goal != -1)) {
+ printk(KERN_ERR "ext4 defrag: Invalid goal offset %llu, "
+ "you can set goal offset up to %llu\n", goal,
+ ext4_blocks_count(es) - 1);
+ return -EINVAL;
+ }
+
if (file_end < block_end)
defrag_size -= block_end - file_end;
@@ -1215,13 +1244,13 @@ ext4_defrag(struct file *filp, ext4_lblk_t block_start,
}
/* Found an isolated block */
- if (seq_extents == 1) {
+ if ((seq_extents == 1) && !goal) {
seq_start = le32_to_cpu(ext_cur->ee_block);
goto CLEANUP;
}
ret = ext4_defrag_new_extent_tree(inode, tmp_inode, path,
- seq_start, seq_blocks, block_start);
+ seq_start, seq_blocks, block_start, goal);
if (ret < 0) {
break;
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 18c1fcf..24c7144 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -298,6 +298,7 @@ struct ext4_new_group_data {
#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
#define EXT4_IOC_MIGRATE _IO('f', 7)
+#define EXT4_IOC_FIBMAP _IOW('f', 9, ext4_fsblk_t)
#define EXT4_IOC_DEFRAG _IOW('f', 10, struct ext4_ext_defrag_data)
/*
@@ -1013,6 +1014,7 @@ extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
struct ext4_dir_entry_2 *dirent);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);
+extern sector_t ext4_bmap(struct address_space *mapping, sector_t block);
/* fsync.c */
extern int ext4_sync_file (struct file *, struct dentry *, int);
@@ -1128,7 +1130,7 @@ extern void ext4_inode_table_set(struct super_block *sb,
extern handle_t *ext4_ext_journal_restart(handle_t *handle, int needed);
/* defrag.c */
extern int ext4_defrag(struct file *filp, ext4_lblk_t block_start,
- ext4_lblk_t defrag_size);
+ ext4_lblk_t defrag_size, ext4_fsblk_t goal);
extern int ext4_defrag_ioctl(struct inode *, struct file *, unsigned int,
unsigned long);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 53943b6..e9db7a7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1605,7 +1605,7 @@ out:
* So, if we see any bmap calls here on a modified, data-journaled file,
* take extra steps to flush any blocks which might be in the cache.
*/
-static sector_t ext4_bmap(struct address_space *mapping, sector_t block)
+sector_t ext4_bmap(struct address_space *mapping, sector_t block)
{
struct inode *inode = mapping->host;
journal_t *journal;
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 98b6f4a..da13cee 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -231,6 +231,7 @@ flags_err:
return err;
}
+ case EXT4_IOC_FIBMAP:
case EXT4_IOC_DEFRAG: {
return ext4_defrag_ioctl(inode, filp, cmd, arg);
}
--
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