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-rw-r--r--fs/Kconfig8
-rw-r--r--fs/jffs2/jffs2_fs_sb.h3
-rw-r--r--fs/jffs2/wbuf.c73
3 files changed, 74 insertions, 10 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index e9c5b81dd665..e19423a2aa7d 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1228,6 +1228,14 @@ config JFFS2_FS_WRITEBUFFER
- NOR flash with transparent ECC
- DataFlash
+config JFFS2_FS_WBUF_VERIFY
+ bool "Verify JFFS2 write-buffer reads"
+ depends on JFFS2_FS_WRITEBUFFER
+ default n
+ help
+ This causes JFFS2 to read back every page written through the
+ write-buffer, and check for errors.
+
config JFFS2_SUMMARY
bool "JFFS2 summary support (EXPERIMENTAL)"
depends on JFFS2_FS && EXPERIMENTAL
diff --git a/fs/jffs2/jffs2_fs_sb.h b/fs/jffs2/jffs2_fs_sb.h
index b13298a824ed..ae99cd7fd43b 100644
--- a/fs/jffs2/jffs2_fs_sb.h
+++ b/fs/jffs2/jffs2_fs_sb.h
@@ -106,6 +106,9 @@ struct jffs2_sb_info {
uint32_t wbuf_pagesize; /* 0 for NOR and other flashes with no wbuf */
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ unsigned char *wbuf_verify; /* read-back buffer for verification */
+#endif
#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
unsigned char *wbuf; /* Write-behind buffer for NAND flash */
uint32_t wbuf_ofs;
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 64f8d7add7e8..ec99c8ec83ae 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -220,6 +220,47 @@ static struct jffs2_raw_node_ref **jffs2_incore_replace_raw(struct jffs2_sb_info
return NULL;
}
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+static int jffs2_verify_write(struct jffs2_sb_info *c, unsigned char *buf,
+ uint32_t ofs)
+{
+ int ret;
+ size_t retlen;
+ char *eccstr;
+
+ ret = c->mtd->read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
+ if (ret && ret != -EUCLEAN && ret != -EBADMSG) {
+ printk(KERN_WARNING "jffs2_verify_write(): Read back of page at %08x failed: %d\n", c->wbuf_ofs, ret);
+ return ret;
+ } else if (retlen != c->wbuf_pagesize) {
+ printk(KERN_WARNING "jffs2_verify_write(): Read back of page at %08x gave short read: %zd not %d.\n", ofs, retlen, c->wbuf_pagesize);
+ return -EIO;
+ }
+ if (!memcmp(buf, c->wbuf_verify, c->wbuf_pagesize))
+ return 0;
+
+ if (ret == -EUCLEAN)
+ eccstr = "corrected";
+ else if (ret == -EBADMSG)
+ eccstr = "correction failed";
+ else
+ eccstr = "OK or unused";
+
+ printk(KERN_WARNING "Write verify error (ECC %s) at %08x. Wrote:\n",
+ eccstr, c->wbuf_ofs);
+ print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
+ c->wbuf, c->wbuf_pagesize, 0);
+
+ printk(KERN_WARNING "Read back:\n");
+ print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
+ c->wbuf_verify, c->wbuf_pagesize, 0);
+
+ return -EIO;
+}
+#else
+#define jffs2_verify_write(c,b,o) (0)
+#endif
+
/* Recover from failure to write wbuf. Recover the nodes up to the
* wbuf, not the one which we were starting to try to write. */
@@ -380,7 +421,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
ret = c->mtd->write(c->mtd, ofs, towrite, &retlen,
rewrite_buf);
- if (ret || retlen != towrite) {
+ if (ret || retlen != towrite || jffs2_verify_write(c, rewrite_buf, ofs)) {
/* Argh. We tried. Really we did. */
printk(KERN_CRIT "Recovery of wbuf failed due to a second write error\n");
kfree(buf);
@@ -587,15 +628,16 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
ret = c->mtd->write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf);
- if (ret || retlen != c->wbuf_pagesize) {
- if (ret)
- printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n",ret);
- else {
- printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
- retlen, c->wbuf_pagesize);
- ret = -EIO;
- }
-
+ if (ret) {
+ printk(KERN_WARNING "jffs2_flush_wbuf(): Write failed with %d\n", ret);
+ goto wfail;
+ } else if (retlen != c->wbuf_pagesize) {
+ printk(KERN_WARNING "jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
+ retlen, c->wbuf_pagesize);
+ ret = -EIO;
+ goto wfail;
+ } else if ((ret = jffs2_verify_write(c, c->wbuf, c->wbuf_ofs))) {
+ wfail:
jffs2_wbuf_recover(c);
return ret;
@@ -1138,11 +1180,22 @@ int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
return -ENOMEM;
}
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf_verify) {
+ kfree(c->oobbuf);
+ kfree(c->wbuf);
+ return -ENOMEM;
+ }
+#endif
return 0;
}
void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
{
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ kfree(c->wbuf_verify);
+#endif
kfree(c->wbuf);
kfree(c->oobbuf);
}