f2fs: readahead multi pages of directory for performance
We have no so such readahead mechanism in ->iterate() path as the one in
->read() path, it cause low performance when we read large directory.
This patch add readahead in f2fs_readdir() for better performance.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 972fd0e..3581c2b 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -637,11 +637,17 @@
struct f2fs_dentry_block *dentry_blk = NULL;
struct f2fs_dir_entry *de = NULL;
struct page *dentry_page = NULL;
+ struct file_ra_state *ra = &file->f_ra;
unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
unsigned char d_type = DT_UNKNOWN;
bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK);
+ /* readahead for multi pages of dir */
+ if (npages - n > 1 && !ra_has_index(ra, n))
+ page_cache_sync_readahead(inode->i_mapping, ra, file, n,
+ min(npages - n, (pgoff_t)MAX_DIR_RA_PAGES));
+
for (; n < npages; n++) {
dentry_page = get_lock_data_page(inode, n);
if (IS_ERR(dentry_page))