* [PATCH v3 1/4] btrfs-progs: lowmem check: Fix false alert about file extent interrupt
@ 2017-06-26 10:37 Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch Lu Fengqi
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Lu Fengqi @ 2017-06-26 10:37 UTC (permalink / raw)
To: linux-btrfs; +Cc: marc
As Qu mentioned in this thread
(https://www.spinics.net/lists/linux-btrfs/msg64469.html), compression
can cause regular extent to co-exist with inlined extent. This coexistence
makes things confusing. Since it was permitted currently, so fix
btrfsck to prevent a bunch of error logs that will make user feel
panic.
When check file extent, record the extent_end of regular extent to check
if there is a gap between the regular extents. Normally there is only one
inlined extent, so the extent_end of inlined extent is useless. However,
if regular extent can co-exist with inlined extent, the extent_end of
inlined extent also need to record.
Reported-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
Changlog:
v2: Just fix reported-by
v3: Output verbose information when file extent interrupt
cmds-check.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/cmds-check.c b/cmds-check.c
index c052f66e..70d2b7f2 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -4782,6 +4782,7 @@ static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey,
extent_num_bytes, item_inline_len);
err |= FILE_EXTENT_ERROR;
}
+ *end += extent_num_bytes;
*size += extent_num_bytes;
return err;
}
@@ -4847,8 +4848,8 @@ static int check_file_extent(struct btrfs_root *root, struct btrfs_key *fkey,
root->objectid, fkey->objectid, fkey->offset);
} else if (!no_holes && *end != fkey->offset) {
err |= FILE_EXTENT_ERROR;
- error("root %llu EXTENT_DATA[%llu %llu] interrupt",
- root->objectid, fkey->objectid, fkey->offset);
+ error("root %llu EXTENT_DATA[%llu %llu] interrupt, should start at %llu",
+ root->objectid, fkey->objectid, fkey->offset, *end);
}
*end += extent_num_bytes;
--
2.13.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch
2017-06-26 10:37 [PATCH v3 1/4] btrfs-progs: lowmem check: Fix false alert about file extent interrupt Lu Fengqi
@ 2017-06-26 10:37 ` Lu Fengqi
2017-07-02 13:50 ` Henk Slager
2017-06-26 10:37 ` [PATCH v3 3/4] btrfs-progs: test: Add test image for lowmem mode file extent interrupt Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 4/4] btrfs-progs: test: Add test image for lowmem mode referencer count mismatch false alert Lu Fengqi
2 siblings, 1 reply; 6+ messages in thread
From: Lu Fengqi @ 2017-06-26 10:37 UTC (permalink / raw)
To: linux-btrfs; +Cc: marc
The normal back reference counting doesn't care about the extent referred
by the extent data in the shared leaf. The check_extent_data_backref
function need to skip the leaf that owner mismatch with the root_id.
Reported-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
cmds-check.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/cmds-check.c b/cmds-check.c
index 70d2b7f2..f42968cd 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -10692,7 +10692,8 @@ static int check_extent_data_backref(struct btrfs_fs_info *fs_info,
leaf = path.nodes[0];
slot = path.slots[0];
- if (slot >= btrfs_header_nritems(leaf))
+ if (slot >= btrfs_header_nritems(leaf) ||
+ btrfs_header_owner(leaf) != root_id)
goto next;
btrfs_item_key_to_cpu(leaf, &key, slot);
if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
--
2.13.1
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch
2017-06-26 10:37 ` [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch Lu Fengqi
@ 2017-07-02 13:50 ` Henk Slager
2017-07-03 2:55 ` Lu Fengqi
0 siblings, 1 reply; 6+ messages in thread
From: Henk Slager @ 2017-07-02 13:50 UTC (permalink / raw)
To: Lu Fengqi; +Cc: linux-btrfs, marc
On Mon, Jun 26, 2017 at 12:37 PM, Lu Fengqi <lufq.fnst@cn.fujitsu.com> wrote:
> The normal back reference counting doesn't care about the extent referred
> by the extent data in the shared leaf. The check_extent_data_backref
> function need to skip the leaf that owner mismatch with the root_id.
>
> Reported-by: Marc MERLIN <marc@merlins.org>
> Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
> ---
> cmds-check.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/cmds-check.c b/cmds-check.c
> index 70d2b7f2..f42968cd 100644
> --- a/cmds-check.c
> +++ b/cmds-check.c
> @@ -10692,7 +10692,8 @@ static int check_extent_data_backref(struct btrfs_fs_info *fs_info,
> leaf = path.nodes[0];
> slot = path.slots[0];
>
> - if (slot >= btrfs_header_nritems(leaf))
> + if (slot >= btrfs_header_nritems(leaf) ||
> + btrfs_header_owner(leaf) != root_id)
> goto next;
> btrfs_item_key_to_cpu(leaf, &key, slot);
> if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
> --
> 2.13.1
With this patch applied to v4.11, I ran:
# btrfs check -p --mode lowmem /dev/mapper/smr
no 'referencer count mismatch' anymore, but likely due to other hidden
corruption, the check took more time than I had planned, so after 5
days, I cancelled it.
As a summary, both kernel and lowmem check mention the same issue as
it looks like; for the lowmem check it is this, (repeating):
[...]
parent transid verify failed on 6350669414400 wanted 24678 found 24184
parent transid verify failed on 6350645837824 wanted 24678 found 23277
Ignoring transid failure
leaf parent key incorrect 6350645837824
ERROR: extent[6349151535104 16384] backref lost (owner: 2, level: 0)
ERROR: check leaf failed root 2 bytenr 6349151535104 level 0, force
continue check
parent transid verify failed on 6350645837824 wanted 24678 found 23277
Ignoring transid failure
leaf parent key incorrect 6350645837824
ERROR: extent[6349150486528 16384] backref lost (owner: 2, level: 0)
ERROR: check leaf failed root 2 bytenr 6349150486528 level 0, force
continue check
^C
My plan is now to image the whole 8TB fs to extra/new storage hardware
with dd and then see if I can get the copy fixed. But it might take a
year before I do so (it is not critical w.r.t. data-loss, it's cold
storage, multi-year btrfs features test).
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch
2017-07-02 13:50 ` Henk Slager
@ 2017-07-03 2:55 ` Lu Fengqi
0 siblings, 0 replies; 6+ messages in thread
From: Lu Fengqi @ 2017-07-03 2:55 UTC (permalink / raw)
To: Henk Slager; +Cc: linux-btrfs
On Sun, Jul 02, 2017 at 03:50:31PM +0200, Henk Slager wrote:
>
>With this patch applied to v4.11, I ran:
># btrfs check -p --mode lowmem /dev/mapper/smr
>
>no 'referencer count mismatch' anymore, but likely due to other hidden
>corruption, the check took more time than I had planned, so after 5
>days, I cancelled it.
>
>As a summary, both kernel and lowmem check mention the same issue as
>it looks like; for the lowmem check it is this, (repeating):
>[...]
>parent transid verify failed on 6350669414400 wanted 24678 found 24184
>parent transid verify failed on 6350645837824 wanted 24678 found 23277
>Ignoring transid failure
>leaf parent key incorrect 6350645837824
>ERROR: extent[6349151535104 16384] backref lost (owner: 2, level: 0)
>ERROR: check leaf failed root 2 bytenr 6349151535104 level 0, force
>continue check
>parent transid verify failed on 6350645837824 wanted 24678 found 23277
>Ignoring transid failure
>leaf parent key incorrect 6350645837824
>ERROR: extent[6349150486528 16384] backref lost (owner: 2, level: 0)
>ERROR: check leaf failed root 2 bytenr 6349150486528 level 0, force
>continue check
This looks like the extent tree has some problems. I would appreciate it
if you could run the following command to dump the extent tree for me?
# btrfs-debug-tree -t 2 /dev/mapper/smr | grep -C 10 -e 6349151535104 -e 6349150486528
>My plan is now to image the whole 8TB fs to extra/new storage hardware
>with dd and then see if I can get the copy fixed. But it might take a
>year before I do so (it is not critical w.r.t. data-loss, it's cold
>storage, multi-year btrfs features test).
>
>
--
Thanks,
Lu
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v3 3/4] btrfs-progs: test: Add test image for lowmem mode file extent interrupt
2017-06-26 10:37 [PATCH v3 1/4] btrfs-progs: lowmem check: Fix false alert about file extent interrupt Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch Lu Fengqi
@ 2017-06-26 10:37 ` Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 4/4] btrfs-progs: test: Add test image for lowmem mode referencer count mismatch false alert Lu Fengqi
2 siblings, 0 replies; 6+ messages in thread
From: Lu Fengqi @ 2017-06-26 10:37 UTC (permalink / raw)
To: linux-btrfs; +Cc: marc
Add a image that the inlined extent coexist with the regular extent.
Reported-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
.../020-extent-ref-cases/inline_regular_coexist.img | Bin 0 -> 4096 bytes
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 tests/fsck-tests/020-extent-ref-cases/inline_regular_coexist.img
diff --git a/tests/fsck-tests/020-extent-ref-cases/inline_regular_coexist.img b/tests/fsck-tests/020-extent-ref-cases/inline_regular_coexist.img
new file mode 100644
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--
2.13.1
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH v3 4/4] btrfs-progs: test: Add test image for lowmem mode referencer count mismatch false alert
2017-06-26 10:37 [PATCH v3 1/4] btrfs-progs: lowmem check: Fix false alert about file extent interrupt Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 3/4] btrfs-progs: test: Add test image for lowmem mode file extent interrupt Lu Fengqi
@ 2017-06-26 10:37 ` Lu Fengqi
2 siblings, 0 replies; 6+ messages in thread
From: Lu Fengqi @ 2017-06-26 10:37 UTC (permalink / raw)
To: linux-btrfs; +Cc: marc
Add a image which can reproduce the extent item referencer count
mismatch false alert for lowmem mode.
Reported-by: Marc MERLIN <marc@merlins.org>
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
---
.../ref_count_mismatch_false_alert.img | Bin 0 -> 4096 bytes
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 tests/fsck-tests/020-extent-ref-cases/ref_count_mismatch_false_alert.img
diff --git a/tests/fsck-tests/020-extent-ref-cases/ref_count_mismatch_false_alert.img b/tests/fsck-tests/020-extent-ref-cases/ref_count_mismatch_false_alert.img
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GIT binary patch
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--
2.13.1
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-07-03 2:55 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-06-26 10:37 [PATCH v3 1/4] btrfs-progs: lowmem check: Fix false alert about file extent interrupt Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 2/4] btrfs-progs: lowmem check: Fix false alert about referencer count mismatch Lu Fengqi
2017-07-02 13:50 ` Henk Slager
2017-07-03 2:55 ` Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 3/4] btrfs-progs: test: Add test image for lowmem mode file extent interrupt Lu Fengqi
2017-06-26 10:37 ` [PATCH v3 4/4] btrfs-progs: test: Add test image for lowmem mode referencer count mismatch false alert Lu Fengqi
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