[PATCH] ufs: little directory lookup optimization

This patch make little optimization of ufs_find_entry like "ext2" does.  Save
number of page and reuse it again in the next call.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 8 insertions, 5 deletions

diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 732c3fd2b6f2..7f0a0aa63584 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -252,6 +252,7 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
         unsigned long start, n;
         unsigned long npages = ufs_dir_pages(dir);
         struct page *page = NULL;
+        struct ufs_inode_info *ui = UFS_I(dir);
         struct ufs_dir_entry *de;
 
         UFSD("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen);
@@ -262,8 +263,8 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
         /* OFFSET_CACHE */
         *res_page = NULL;
 
-        /* start = ei->i_dir_start_lookup; */
-        start = 0;
+        start = ui->i_dir_start_lookup;
+
         if (start >= npages)
                 start = 0;
         n = start;
@@ -295,7 +296,7 @@ out:
 
 found:
         *res_page = page;
-        /* ei->i_dir_start_lookup = n; */
+        ui->i_dir_start_lookup = n;
         return de;
 }
 
diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index ad017fa2dd21..c684aaad9998 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -264,6 +264,7 @@ cg_found:
         ufsi->i_shadow = 0;
         ufsi->i_osync = 0;
         ufsi->i_oeftflag = 0;
+        ufsi->i_dir_start_lookup = 0;
         memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1));
 
         insert_inode_hash(inode);
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 01f754462341..c57612d443d0 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -628,12 +628,12 @@ void ufs_read_inode (struct inode * inode)
         ufsi->i_shadow = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_shadow);
         ufsi->i_oeftflag = fs32_to_cpu(sb, ufs_inode->ui_u3.ui_sun.ui_oeftflag);
         ufsi->i_lastfrag = (inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
+        ufsi->i_dir_start_lookup = 0;
         
         if (S_ISCHR(mode) || S_ISBLK(mode) || inode->i_blocks) {
                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR); i++)
                         ufsi->i_u1.i_data[i] = ufs_inode->ui_u2.ui_addr.ui_db[i];
-        }
-        else {
+        } else {
                 for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
                         ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
         }
diff --git a/include/linux/ufs_fs_i.h b/include/linux/ufs_fs_i.h
index 21665a953978..f50ce3b0cd52 100644
--- a/include/linux/ufs_fs_i.h
+++ b/include/linux/ufs_fs_i.h
@@ -27,6 +27,7 @@ struct ufs_inode_info {
         __u32   i_oeftflag;
         __u16   i_osync;
         __u32   i_lastfrag;
+        __u32   i_dir_start_lookup;
         struct inode vfs_inode;
 };