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[PATCH] ufs: little directory lookup optimization

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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>
This commit is contained in:
Evgeniy Dushistov 2006-06-25 05:47:25 -07:00 committed by Linus Torvalds
parent abf5d15fd2
commit dd187a2603
4 changed files with 8 additions and 5 deletions
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7
fs/ufs/dir.c
View file

@ -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 @@ struct ufs_dir_entry *ufs_find_entry(struct inode *dir, struct dentry *dentry,
found:
*res_page = page;
/* ei->i_dir_start_lookup = n; */
ui->i_dir_start_lookup = n;
return de;
}

1
fs/ufs/ialloc.c
View file

@ -264,6 +264,7 @@ struct inode * ufs_new_inode(struct inode * dir, int mode)
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);

4
fs/ufs/inode.c
View file

@ -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];
}

1
include/linux/ufs_fs_i.h
View file

@ -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;
};