This patch reverts the following 3 commits:
d0cc40d23a ("btrfs-progs: tests: add test case for ram_bytes detection and repair")
7313573c19 ("btrfs-progs: check: original, detect and repair ram_bytes mismatch")
97bf7a5969 ("btrfs-progs: check: lowmem, detect and repair mismatched ram_bytes")
The problem with the ram_bytes check is, kernel can handle it without
any problem, and the original objective for this is to detect such
problem as I immaturelly believe the problem is fixed.
But it turns out to be incorrect and this check is already causing
problems.
Fix it by doing a full revert for now.
Pull-request: #828
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
For non-compressed non-hole file extent items, the ram_bytes should
match disk_num_bytes.
But due to kernel bugs, we have several cases where ram_bytes is not
correctly updated.
Thankfully this is really a very minor mismatch and can never cause data
corruption since the kernel does not utilize ram_bytes for
non-compressed extents at all.
So here we just detect and repair it for lowmem mode.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Bit shifts should be done on unsigned types as we're approaching 32,
also update some missing descriptions.
Signed-off-by: David Sterba <dsterba@suse.com>
Commit 6cf11f3e38 ("btrfs-progs: check: check order of inline extent
refs") added the ability to detect out-of-order inline extent backref
items.
Meanwhile there is no such ability in lowmem mode, this patch would
introduce such ability to lowmem mode.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
We can already fix this problem with the block accounting code, we just
need to keep track of how much we should have used on the file system,
and then check it against the bytes_super. The repair just piggy backs
on the block group used repair.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Since kernel is going to reject any root item which is newer than super
block generation, we need to provide a way to fix such problem in
btrfs-check.
This patch addes the ability to report and repair root generation in
lowmem mode.
This is done by cowing the root node, so we will update the root
generation along with the root node generation at commit transaction
time.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Unlike inodes in fs roots, we don't really check the inode items in root
tree, in fact we just skip everything other than ROOT_ITEM and ROOT_REF.
This makes invalid inode items sneak into root tree.
For example:
item 9 key (256 INODE_ITEM 0) itemoff 13702 itemsize 160
generation 30 transid 30 size 65536 nbytes 1507328
block group 0 mode 0 links 1 uid 0 gid 0 rdev 0
^ Should be 100600
sequence 23 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 08:00:00)
ctime 1553491158.189771625 (2019-03-25 13:19:18)
mtime 0.0 (1970-01-01 08:00:00)
otime 0.0 (1970-01-01 08:00:00)
There is a report of such problem in the mail list.
This patch will check and repair inode items of free space cache inodes in
lowmem mode.
Since free space cache inodes doesn't have INODE_REF but still has 1
link, we can't use check_inode_item() directly.
Instead we only check the inode mode, as that's the important part.
The check and repair function: check_repair_free_space_inode() is also
exported for original mode.
Signed-off-by: Qu Wenruo <wqu@suse.com>
There is one report about invalid free space cache inode mode.
Normally free space cache inode should have mode 100600 (regular file,
no uid/gid/sticky bit, rw------ bit).
But in that report, we have free space cache inode mode as 0.
So at least btrfs check should report invalid inode mode.
This patch will at least make btrfs check lowmem mode to detect this
problem.
Please note that, this check only applies to inodes in fs/subvol trees.
It doesn't apply to free space cache inodes.
Reported-by: Thorsten Hirsch <t.hirsch@web.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
For DIR_ITEM with mismatch hash, we could just remove the offending dir
item from the tree.
Lowmem mode will handle the rest, either re-create the correct dir_item
or move the orphan inode to lost+found.
This is especially important for old filesystems, since later kernel
introduces stricter tree-checker, which could detect such hash mismatch
and refuse to read the corrupted leaf.
With this repair ability, user could repair with 'btrfs check
--mode=lowmem --repair'.
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1111991
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Define new error bit INODE_FLAGS_ERROR to represents invalid inode
flags error.
Symlinks should never have append/immutable flags set.
While checking inodes, if found a symlink with append/immutable
flags, report and record the inode flags error.
This is for lowmem mode.
Issue: #133
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In lowmem mode with '--repair', check_chunks_and_extents_v2 will fix
accounting in block groups and clear the error bit BG_ACCOUNTING_ERROR.
However, return value of check_btrfs_root() doesn't contain error bits.
If extent tree is on error, lowmem repair always prints error and
returns nonzero value even the filesystem is fine after repair.
Introduce FATAL_ERROR for lowmem mode to represent negative return
values since negative and positive can't be mixed in the bit operations.
Then let check_btrfs_root() return error bits.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Qu Wenruo
David Sterba
Josef Bacik
Josh Soref
Su Yue