We may be doing more metadata readahead in future. Acked-by: Jan Kara Signed-off-by: Wu Fengguang --- fs/ext3/dir.c | 1 + fs/ext4/dir.c | 1 + include/linux/fs.h | 1 + mm/readahead.c | 1 + 4 files changed, 4 insertions(+) --- linux-next.orig/fs/ext3/dir.c 2012-01-25 15:57:46.000000000 +0800 +++ linux-next/fs/ext3/dir.c 2012-01-25 15:57:52.000000000 +0800 @@ -136,6 +136,7 @@ static int ext3_readdir(struct file * fi pgoff_t index = map_bh.b_blocknr >> (PAGE_CACHE_SHIFT - inode->i_blkbits); if (!ra_has_index(&filp->f_ra, index)) + filp->f_ra.for_metadata = 1; page_cache_sync_readahead( sb->s_bdev->bd_inode->i_mapping, &filp->f_ra, filp, --- linux-next.orig/fs/ext4/dir.c 2012-01-25 15:57:46.000000000 +0800 +++ linux-next/fs/ext4/dir.c 2012-01-25 15:57:52.000000000 +0800 @@ -153,6 +153,7 @@ static int ext4_readdir(struct file *fil pgoff_t index = map.m_pblk >> (PAGE_CACHE_SHIFT - inode->i_blkbits); if (!ra_has_index(&filp->f_ra, index)) + filp->f_ra.for_metadata = 1; page_cache_sync_readahead( sb->s_bdev->bd_inode->i_mapping, &filp->f_ra, filp, --- linux-next.orig/include/linux/fs.h 2012-01-25 15:57:51.000000000 +0800 +++ linux-next/include/linux/fs.h 2012-01-25 15:57:52.000000000 +0800 @@ -955,6 +955,7 @@ struct file_ra_state { u16 mmap_miss; /* Cache miss stat for mmap accesses */ u8 pattern; /* one of RA_PATTERN_* */ unsigned int for_mmap:1; /* readahead for mmap accesses */ + unsigned int for_metadata:1; /* readahead for meta data */ loff_t prev_pos; /* Cache last read() position */ }; --- linux-next.orig/mm/readahead.c 2012-01-25 15:57:51.000000000 +0800 +++ linux-next/mm/readahead.c 2012-01-25 15:57:52.000000000 +0800 @@ -260,6 +260,7 @@ unsigned long ra_submit(struct file_ra_s ra->start, ra->size, ra->async_size); ra->for_mmap = 0; + ra->for_metadata = 0; return actual; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/