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UBIFS: add no_chk_data_crc mount option

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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 <ext-adrian.hunter@nokia.com>
This commit is contained in:
Adrian Hunter
2008-09-04 16:26:00 +03:00
committed by Artem Bityutskiy
parent 4793e7c5e1
commit 2953e73f1c
6 changed files with 61 additions and 9 deletions
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6
fs/ubifs/tnc.c
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@@ -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;