From 2953e73f1ce4b3284b409aefb9d46bbde6515c37 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 4 Sep 2008 16:26:00 +0300 Subject: UBIFS: add no_chk_data_crc mount option UBIFS read performance can be improved by skipping the CRC check when data nodes are read. This option can be used if the underlying media is considered to be highly reliable. Note that CRCs are always checked for metadata. Read speed on Arm platform with OneNAND goes from 19 MiB/s to 27 MiB/s with data CRC checking disabled. Signed-off-by: Adrian Hunter --- fs/ubifs/tnc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/ubifs/tnc.c') diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c index d279012..66dc571 100644 --- a/fs/ubifs/tnc.c +++ b/fs/ubifs/tnc.c @@ -470,6 +470,10 @@ static int try_read_node(const struct ubifs_info *c, void *buf, int type, if (node_len != len) return 0; + if (type == UBIFS_DATA_NODE && !c->always_chk_crc) + if (c->no_chk_data_crc) + return 0; + crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8); node_crc = le32_to_cpu(ch->crc); if (crc != node_crc) @@ -1687,7 +1691,7 @@ static int validate_data_node(struct ubifs_info *c, void *buf, goto out_err; } - err = ubifs_check_node(c, buf, zbr->lnum, zbr->offs, 0); + err = ubifs_check_node(c, buf, zbr->lnum, zbr->offs, 0, 0); if (err) { ubifs_err("expected node type %d", UBIFS_DATA_NODE); goto out; -- cgit v1.1