6 files changed, 36 insertions, 10 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-ext4 b/Documentation/ABI/testing/sysfs-fs-ext4
index 4e79074de282..5fb709997d96 100644
--- a/Documentation/ABI/testing/sysfs-fs-ext4
+++ b/Documentation/ABI/testing/sysfs-fs-ext4
@@ -79,3 +79,13 @@ Description:
                 This file is read-only and shows the number of
                 kilobytes of data that have been written to this
                 filesystem since it was mounted.
+
+What:           /sys/fs/ext4/<disk>/inode_goal
+Date:           June 2008
+Contact:        "Theodore Ts'o" <tytso@mit.edu>
+Description:
+                Tuning parameter which (if non-zero) controls the goal
+                inode used by the inode allocator in p0reference to
+                all other allocation hueristics.  This is intended for
+                debugging use only, and should be 0 on production
+                systems.
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d035cf149e0e..746cdcba969d 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -863,6 +863,7 @@ struct ext4_sb_info {
         int s_inode_size;
         int s_first_ino;
         unsigned int s_inode_readahead_blks;
+        unsigned int s_inode_goal;
         spinlock_t s_next_gen_lock;
         u32 s_next_generation;
         u32 s_hash_seed[4];
@@ -1316,7 +1317,7 @@ extern int ext4fs_dirhash(const char *name, int len, struct
 
 /* ialloc.c */
 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
-                                    const struct qstr *qstr);
+                                    const struct qstr *qstr, __u32 goal);
 extern void ext4_free_inode(handle_t *, struct inode *);
 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
 extern unsigned long ext4_count_free_inodes(struct super_block *);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 3f98ee712ff4..2f645732e3b7 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -799,7 +799,7 @@ err_ret:
  * group to find a free inode.
  */
 struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode,
-                             const struct qstr *qstr)
+                             const struct qstr *qstr, __u32 goal)
 {
         struct super_block *sb;
         struct buffer_head *inode_bitmap_bh = NULL;
@@ -830,6 +830,16 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, int mode,
         ei = EXT4_I(inode);
         sbi = EXT4_SB(sb);
 
+        if (!goal)
+                goal = sbi->s_inode_goal;
+
+        if (goal && goal < le32_to_cpu(sbi->s_es->s_inodes_count)) {
+                group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
+                ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
+                ret2 = 0;
+                goto got_group;
+        }
+
         if (sbi->s_log_groups_per_flex && test_opt(sb, OLDALLOC)) {
                 ret2 = find_group_flex(sb, dir, &group);
                 if (ret2 == -1) {
@@ -858,7 +868,7 @@ got_group:
         if (ret2 == -1)
                 goto out;
 
-        for (i = 0; i < ngroups; i++) {
+        for (i = 0; i < ngroups; i++, ino = 0) {
                 err = -EIO;
 
                 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
@@ -870,8 +880,6 @@ got_group:
                 if (!inode_bitmap_bh)
                         goto fail;
 
-                ino = 0;
-
 repeat_in_this_group:
                 ino = ext4_find_next_zero_bit((unsigned long *)
                                               inode_bitmap_bh->b_data,
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 80d075b8aeaf..313a50b39741 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -458,6 +458,7 @@ int ext4_ext_migrate(struct inode *inode)
         struct inode *tmp_inode = NULL;
         struct list_blocks_struct lb;
         unsigned long max_entries;
+        __u32 goal;
 
         /*
          * If the filesystem does not support extents, or the inode
@@ -483,8 +484,10 @@ int ext4_ext_migrate(struct inode *inode)
                 retval = PTR_ERR(handle);
                 return retval;
         }
+        goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
+                EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
         tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
-                                   S_IFREG, 0);
+                                   S_IFREG, 0, goal);
         if (IS_ERR(tmp_inode)) {
                 retval = -ENOMEM;
                 ext4_journal_stop(handle);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5f00d2418a83..de04013d16ff 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1782,7 +1782,7 @@ retry:
         if (IS_DIRSYNC(dir))
                 ext4_handle_sync(handle);
 
-        inode = ext4_new_inode(handle, dir, mode, &dentry->d_name);
+        inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0);
         err = PTR_ERR(inode);
         if (!IS_ERR(inode)) {
                 inode->i_op = &ext4_file_inode_operations;
@@ -1816,7 +1816,7 @@ retry:
         if (IS_DIRSYNC(dir))
                 ext4_handle_sync(handle);
 
-        inode = ext4_new_inode(handle, dir, mode, &dentry->d_name);
+        inode = ext4_new_inode(handle, dir, mode, &dentry->d_name, 0);
         err = PTR_ERR(inode);
         if (!IS_ERR(inode)) {
                 init_special_inode(inode, inode->i_mode, rdev);
@@ -1853,7 +1853,8 @@ retry:
         if (IS_DIRSYNC(dir))
                 ext4_handle_sync(handle);
 
-        inode = ext4_new_inode(handle, dir, S_IFDIR | mode, &dentry->d_name);
+        inode = ext4_new_inode(handle, dir, S_IFDIR | mode,
+                               &dentry->d_name, 0);
         err = PTR_ERR(inode);
         if (IS_ERR(inode))
                 goto out_stop;
@@ -2264,7 +2265,8 @@ retry:
         if (IS_DIRSYNC(dir))
                 ext4_handle_sync(handle);
 
-        inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO, &dentry->d_name);
+        inode = ext4_new_inode(handle, dir, S_IFLNK|S_IRWXUGO,
+                               &dentry->d_name, 0);
         err = PTR_ERR(inode);
         if (IS_ERR(inode))
                 goto out_stop;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 04486a53469f..23013d303f81 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2206,6 +2206,7 @@ EXT4_RO_ATTR(session_write_kbytes);
 EXT4_RO_ATTR(lifetime_write_kbytes);
 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
                  inode_readahead_blks_store, s_inode_readahead_blks);
+EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
@@ -2218,6 +2219,7 @@ static struct attribute *ext4_attrs[] = {
         ATTR_LIST(session_write_kbytes),
         ATTR_LIST(lifetime_write_kbytes),
         ATTR_LIST(inode_readahead_blks),
+        ATTR_LIST(inode_goal),
         ATTR_LIST(mb_stats),
         ATTR_LIST(mb_max_to_scan),
         ATTR_LIST(mb_min_to_scan),