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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>
This commit is contained in:
Chao Yu 2014-04-28 17:59:43 +08:00 committed by Jaegeuk Kim
parent 5c1f9927ec
commit 817202d937
2 changed files with 8 additions and 0 deletions
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6
fs/f2fs/dir.c
View File

@ -637,11 +637,17 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
struct f2fs_dentry_block *dentry_blk = NULL; struct f2fs_dentry_block *dentry_blk = NULL;
struct f2fs_dir_entry *de = NULL; struct f2fs_dir_entry *de = NULL;
struct page *dentry_page = 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 int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
unsigned char d_type = DT_UNKNOWN; unsigned char d_type = DT_UNKNOWN;
bit_pos = ((unsigned long)ctx->pos % NR_DENTRY_IN_BLOCK); 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++) { for (; n < npages; n++) {
dentry_page = get_lock_data_page(inode, n); dentry_page = get_lock_data_page(inode, n);
if (IS_ERR(dentry_page)) if (IS_ERR(dentry_page))

2
fs/f2fs/f2fs.h
View File

@ -182,6 +182,8 @@ enum {
#define F2FS_LINK_MAX 32000 /* maximum link count per file */ #define F2FS_LINK_MAX 32000 /* maximum link count per file */
#define MAX_DIR_RA_PAGES 4 /* maximum ra pages of dir */
/* for in-memory extent cache entry */ /* for in-memory extent cache entry */
#define F2FS_MIN_EXTENT_LEN 16 /* minimum extent length */ #define F2FS_MIN_EXTENT_LEN 16 /* minimum extent length */