From: Sascha Hauer <s.hauer@pengutronix.de>
To: Barebox List <barebox@lists.infradead.org>
Subject: [PATCH 41/42] state: Remove -EUCLEAN check from userspace tool
Date: Fri, 31 Mar 2017 09:03:45 +0200 [thread overview]
Message-ID: <20170331070346.26878-42-s.hauer@pengutronix.de> (raw)
In-Reply-To: <20170331070346.26878-1-s.hauer@pengutronix.de>
The state code is used for the userspace tool aswell, kept in sync
manually. This patch only introduces a change for the userspace
tool, not for barebox.
In Linux userspace there is no direct possibility to check for -EUCLEAN.
To indirectly check for -EUCLEAN the state tool reads the number of
corrected bits before and after reading a block. Unfortunately it does
not take the number of acceptable bitflips into account, but instead
returns -EUCLEAN even when only a single bitflip occurred on a whole
page. To be correct the algorithm must be more complicated: We would
have to read the bitflip_threshold from sysfs. This value is per ECC
step (often 512 byte), not per page. We would have to read the page
in ECC step size chunks, testing for bitflips lower than the threshold
for each chunk. Even if we would do that, there's still another issue.
The eccstats ioctl delivers the eccstats for the whole device, so a
concurrent reader would falsify the result.
Let's decide that this is not worth the hassle and assume that no
device has enough uptime that a cleanup in barebox is not sufficient.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
common/state/backend_bucket_circular.c | 21 ---------------------
1 file changed, 21 deletions(-)
diff --git a/common/state/backend_bucket_circular.c b/common/state/backend_bucket_circular.c
index d99ba39126..5279ec9ce2 100644
--- a/common/state/backend_bucket_circular.c
+++ b/common/state/backend_bucket_circular.c
@@ -171,33 +171,12 @@ static int state_mtd_peb_read(struct state_backend_storage_bucket_circular *circ
dev_dbg(circ->dev, "Read state from %ld length %zd\n", offset,
len);
- ret = ioctl(circ->fd, ECCGETSTATS, &stat1);
- if (ret)
- nostats = true;
ret = read_full(circ->fd, buf, len);
if (ret < 0) {
dev_err(circ->dev, "Failed to read circular storage len %zd, %d\n",
len, ret);
free(buf);
- return ret;
- }
-
- if (nostats)
- return 0;
-
- ret = ioctl(circ->fd, ECCGETSTATS, &stat2);
- if (ret)
- return 0;
-
- if (stat2.failed - stat1.failed > 0) {
- ret = -EUCLEAN;
- dev_dbg(circ->dev, "PEB %u has ECC error, forcing rewrite\n",
- circ->eraseblock);
- } else if (stat2.corrected - stat1.corrected > 0) {
- ret = -EUCLEAN;
- dev_dbg(circ->dev, "PEB %u is unclean, forcing rewrite\n",
- circ->eraseblock);
}
return ret;
--
2.11.0
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next prev parent reply other threads:[~2017-03-31 7:04 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-31 7:03 State patches Sascha Hauer
2017-03-31 7:03 ` [PATCH 01/42] state: Make pointing to the backend using a phandle the only supported method Sascha Hauer
2017-05-15 9:18 ` Jan Remmet
2017-05-15 10:14 ` Jan Remmet
2017-05-16 5:33 ` Sascha Hauer
2017-05-17 9:13 ` Jan Remmet
2017-03-31 7:03 ` [PATCH 02/42] state: Use positive logic Sascha Hauer
2017-03-31 7:03 ` [PATCH 03/42] state: backend: remove .get_packed_len Sascha Hauer
2017-03-31 7:03 ` [PATCH 04/42] state: backend: remove len_hint argument from state_storage_read Sascha Hauer
2017-03-31 7:03 ` [PATCH 05/42] state: Drop backend as extra struct type Sascha Hauer
2017-03-31 7:03 ` [PATCH 06/42] state: merge backend.c into state.c Sascha Hauer
2017-03-31 7:03 ` [PATCH 07/42] state: open code state_backend_init in caller Sascha Hauer
2017-03-31 7:03 ` [PATCH 08/42] state: remove unnecessary argument from state_format_init Sascha Hauer
2017-03-31 7:03 ` [PATCH 09/42] state: pass struct state * to storage functions Sascha Hauer
2017-03-31 7:03 ` [PATCH 10/42] state: storage: initialize variable once outside loop Sascha Hauer
2017-03-31 7:03 ` [PATCH 11/42] state: backend_circular: Read whole PEB Sascha Hauer
2017-04-15 8:40 ` Sam Ravnborg
2017-03-31 7:03 ` [PATCH 12/42] state: drop lazy_init Sascha Hauer
2017-03-31 7:03 ` [PATCH 13/42] state: simplify direct backend Sascha Hauer
2017-03-31 7:03 ` [PATCH 14/42] state: replace len_hint logic Sascha Hauer
2017-03-31 7:03 ` [PATCH 15/42] state: Convert all bufs to void * Sascha Hauer
2017-03-31 7:03 ` [PATCH 16/42] state: Drop cache bucket Sascha Hauer
2017-04-15 8:53 ` Sam Ravnborg
2017-04-19 8:22 ` Sascha Hauer
2017-03-31 7:03 ` [PATCH 17/42] state: backend-direct: Fix max_size Sascha Hauer
2017-03-31 7:03 ` [PATCH 18/42] state: bucket: Make output more informative Sascha Hauer
2017-03-31 7:03 ` [PATCH 19/42] state: backend_bucket_direct: max_size is always given Sascha Hauer
2017-03-31 7:03 ` [PATCH 20/42] state: backend: Add more fields to struct state_backend_storage Sascha Hauer
2017-03-31 7:03 ` [PATCH 21/42] state: backend_circular: remove unnecessary warning Sascha Hauer
2017-03-31 7:03 ` [PATCH 22/42] state: storage: direct: do not close file that is not opened Sascha Hauer
2017-03-31 7:03 ` [PATCH 23/42] state: backend: Add some documentation Sascha Hauer
2017-03-31 7:03 ` [PATCH 24/42] state: backend_circular: default to circular storage Sascha Hauer
2017-03-31 7:03 ` [PATCH 25/42] state: backend_circular: rewrite function doc Sascha Hauer
2017-03-31 7:03 ` [PATCH 26/42] state: backend_storage: Rename variable nr_copies to n_buckets Sascha Hauer
2017-03-31 7:03 ` [PATCH 27/42] state: backend_storage: Rename variable desired_copies to desired_buckets Sascha Hauer
2017-03-31 7:03 ` [PATCH 28/42] state: backend_storage: rewrite function doc Sascha Hauer
2017-03-31 7:03 ` [PATCH 29/42] state: backend_storage: make locally used variable static Sascha Hauer
2017-03-31 7:03 ` [PATCH 30/42] state: backend_storage: rename more variables Sascha Hauer
2017-03-31 7:03 ` [PATCH 31/42] keystore: implement forgetting secrets Sascha Hauer
2017-03-31 7:03 ` [PATCH 32/42] commands: implement keystore command Sascha Hauer
2017-03-31 7:03 ` [PATCH 33/42] commands: state: allow loading state with -l Sascha Hauer
2017-03-31 7:03 ` [PATCH 34/42] crypto: digest: initialize earlier Sascha Hauer
2017-03-31 7:03 ` [PATCH 35/42] state: backend_raw: alloc digest only when needed Sascha Hauer
2017-03-31 7:03 ` [PATCH 36/42] state: backend_circular: Set minumum writesize to 8 Sascha Hauer
2017-03-31 7:03 ` [PATCH 37/42] state: backend bucket circular: Explain metadata Sascha Hauer
2017-03-31 7:03 ` [PATCH 38/42] state: Allow to load without authentification Sascha Hauer
2017-03-31 7:03 ` [PATCH 39/42] state: Update documentation Sascha Hauer
2017-03-31 7:03 ` [PATCH 40/42] state: Do not load state during state_new_from_node Sascha Hauer
2017-03-31 7:03 ` Sascha Hauer [this message]
2017-03-31 7:03 ` [PATCH 42/42] state: find device node from device path, not from device node path Sascha Hauer
2017-04-03 20:15 ` State patches Sam Ravnborg
2017-04-04 6:19 ` Sascha Hauer
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