fget() returns NULL if error. So, we should check NULL or not.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
I have a broken file system that when it aborts leaves all sorts of accounting
things wrong and gives you lots of WARN_ON()'s other than the abort. This is
because we're not cleaning up various parts of the file system when we abort.
The first chunks are specific to mount failures, we weren't cleaning up the
block group cached inodes and we weren't cleaning up any transactions that had
been aborted, which leaves a bunch of things laying around.
The second half of this are related to the cleanup parts. First we don't need
to release space for the dirty pages from the trans_block_rsv, that's all
handled by the trans handles so this is just plain wrong. The other thing is we
need to pin down extents that were set ->must_insert_reserved for delayed refs.
This isn't so much for the pinning but more for the cleaning up the
cache->reserved counter since we are no longer going to use those reserved
bytes. With this patch I no longer see a bunch of WARN_ON()'s when I try to
mount this broken file system, just the initial one from the abort. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We can just look up the extent_buffers for the range and free stuff that way.
This makes the cleanup a bit cleaner and we can make sure to evict the
extent_buffers pretty quickly by marking them as stale. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We need to check the return value of the commit in case something goes wrong,
otherwise we could end up going down the line and doing more stuff (like orphan
cleanup) before we notice we should have errored out. We need to do this before
we free up the log_tree_root since the caller will handle all of that. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We can run the tree logging recovery or the orphan cleanup on mount, so we'll
end up looking up a random fs tree in the meantime. So we need to clean this up
so we don't leave extent buffers hanging around on the cache. With this patch
we no longer leak extent buffers on failure to mount. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This is the same as the fix from commit
Btrfs: fix bad extent logging
but for O_DIRECT. I missed this when I fixed the problem originally, we were
still using the em for the orig_start and orig_block_len, which would be the
merged extent. We need to use the actual extent from the on disk file extent
item, which we have to lookup to make sure it's ok to nocow anyway so just pass
in some pointers to hold this info. Thanks,
Cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We kept leaking extent buffers when mounting a broken file system and it turns
out it's because not everybody uses read_tree_block properly. You need to check
and make sure the extent_buffer is uptodate before you use it. This patch fixes
everybody who calls read_tree_block directly to make sure they check that it is
uptodate and free it and return an error if it is not. With this we no longer
leak EB's when things go horribly wrong. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
If we fail to load block groups halfway through we can leave extent_state's on
the excluded tree. This is because we just lookup the supers and add them to
the excluded tree regardless of which block group we are looking at currently.
This is a problem because we remove the excluded extents for the range of the
block group only, so if we don't ever load a block group for one of the excluded
extents we won't ever free it. This fixes the problem by only adding excluded
extents if it falls in the block group range we care about. With this patch
we're no longer leaking space when we fail to read all of the block groups.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
With a users corrupted fs I was getting weird behavior and panics and it turns
out it was because one of his tree blocks had a bogus header level. So add this
to the sanity checks in the endio handler for tree blocks. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
A user sent me a btrfs-image that was panicing because of some corruption. This
is because we pass in a bogus value to btrfs_num_copies, and it panics. Instead
just return 1. We only call btrfs_num_copies to see if there are other copies
to try and read for things, so if we just return 1 it will make the callers exit
out with an appropriate error value. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Martin Steigerwald reported a BUG_ON() where we were given a bogus bytenr to
map. Turns out he is using > PAGESIZE leafsizes. The readahead stuff is called
every time we do a completion, but we may not have finished reading in all the
pages, so the bytenr we read off the node could be completely bogus. Fix this
by only calling the readahead hook once all pages have been read in. Thanks,
Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Martin Steigerwald reported a BUG_ON() in btrfs_map_block where we didn't find
a chunk for a particular block we were trying to map. This happened because the
block was bogus. We shouldn't be BUG_ON()'ing in this case, just print a
message and return an error. This came from reada_add_block and it appears to
deal with an error fine so we should be good there. Thanks,
Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We need to tag metadata io with REQ_META to avoid priority inversion when using
io throttling cqroups. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
So I noticed there is an infinite loop in the slow caching code. If we return 1
when we hit the end of the tree, so we could end up caching the last block group
the slow way and suddenly we're looping forever because we just keep
re-searching and trying again. Fix this by only doing btrfs_next_leaf() if we
don't need_resched(). Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
The locking order for stuff is
__sb_start_write
ordered_mutex
but with sync() we don't do __sb_start_write for some strange reason, which
means that our iput in wait_ordered_extents could start a transaction which does
the __sb_start_write while we're holding the ordered_mutex. Fix this by using
delayed iput in sync. Thanks,
Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Since all the quota configurations are loaded in memory, and we can
have ioctl checks before operating in the disk. It is safe to do such
things because qgroup_ioctl_lock is held outside.
Without these extra checks firstly, it should be ok to do user change
for quota operations. For example:
if we want to add an existed qgroup, we will do:
->add_qgroup_item()
->add_qgroup_rb()
add_qgroup_item() will return -EEXIST to us, however, qgroups are all
in memory, why not check them in memory firstly.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
For created snapshots, the full root_item is copied from the source
root and afterwards selectively modified. The current code forgets
to clear the field received_uuid. The only problem is that it is
confusing when you look at it with 'btrfs subv list', since for
writable snapshots, the contents of the snapshot can be completely
unrelated to the previously received snapshot.
The receiver ignores such snapshots anyway because he also checks
the field stransid in the root_item and that value used to be reset
to zero for all created snapshots.
This commit changes two things:
- clear the received_uuid field for new writable snapshots.
- don't clear the send/receive related information like the stransid
for read-only snapshots (which makes them useable as a parent for
the automatic selection of parents in the receive code).
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Dave reported a BUG_ON() that happened in end_page_writeback() after an abort.
This happened because we unconditionally call end_page_writeback() in the endio
case, which is right. However when we abort the transaction we will call
end_page_writeback() on any writeback pages we find, which is wrong. We need to
lock the page and wait on page writeback to complete if it is. There is nothing
unsafe about this since we are discarding the transaction anyway. Thanks,
Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
We need such a sanity check for wrong start when we defrag a file, otherwise,
even with a wrong start that's larger than file size, we can end up changing
not only inode's force compress flag but also FS's incompat flags.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Stefan Behrens
Tsutomu Itoh
Josef Bacik
Wang Shilong
Liu Bo