sfrench/cifs-2.6.git
3 years agobtrfs: rename btrfs_release_extent_buffer_page
David Sterba [Thu, 19 Jul 2018 15:24:32 +0000 (17:24 +0200)]
btrfs: rename btrfs_release_extent_buffer_page

The function used to release one page (and always the first one), but
not anymore since a50924e3a4d7fccb0ecfbd4 ("btrfs: drop constant param
from btrfs_release_extent_buffer_page").  Update the name and comment.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Refactor loop in btrfs_release_extent_buffer_page
Nikolay Borisov [Wed, 27 Jun 2018 13:38:22 +0000 (16:38 +0300)]
btrfs: Refactor loop in btrfs_release_extent_buffer_page

The purpose of the function is to free all the pages comprising an
extent buffer. This can be achieved with a simple for loop rather than
the slightly more involved 'do {} while' construct. So rewrite the
loop using a 'for' construct. Additionally we can never have an
extent_buffer that has 0 pages so remove the check for index == 0. No
functional changes.

The reversed order used to have a meaning in the past where the first
page served as a blocking point for several callers. See eg
4f2de97acee6532b36dd6e99 ("Btrfs: set page->private to the eb").

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Reword dodgy comments in alloc_extent_buffer
Nikolay Borisov [Wed, 4 Jul 2018 07:24:52 +0000 (10:24 +0300)]
btrfs: Reword dodgy comments in alloc_extent_buffer

Commit eb14ab8ed24a ("Btrfs: fix page->private races") fixed a genuine
race between extent buffer initialisation and btree_releasepage.
Unfortunately as the code has evolved the comments weren't changed which
made them slightly wrong and they weren't very clear in the fist place.
Fix this by (hopefully) rewording them in a more approachable manner.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Simplify page unlocking in alloc_extent_buffer
Nikolay Borisov [Wed, 4 Jul 2018 07:24:51 +0000 (10:24 +0300)]
btrfs: Simplify page unlocking in alloc_extent_buffer

Current version of the page unlocking code was added in
727011e07cbd ("Btrfs: allow metadata blocks larger than the page size")
but even in this commit that particular flag was never used per-se. In
fact, btrfs only uses PageChecked for data pages to identify pages
which have been dirtied but don't have ORDERED bit set. For more
information see 247e743cbe6e ("Btrfs: Use async helpers to deal with
pages that have been improperly dirtied").

However, this doesn't apply to extent buffer pages. The important bit
here is that the pages are unlocked AFTER the extent buffer has been
properly recorded in the radix tree to avoid races with
btree_releasepage. Let's exploit this fact and simplify the page
unlocking sequence by unlocking the pages in-order and removing the
redundant PageChecked flag setting/clearing.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: scrub: cleanup the remaining nodatasum fixup code
Qu Wenruo [Wed, 11 Jul 2018 05:41:22 +0000 (13:41 +0800)]
btrfs: scrub: cleanup the remaining nodatasum fixup code

Remove the remaining code that misused the page cache pages during
device replace and could cause data corruption for compressed nodatasum
extents. Such files do not normally exist but there's a bug that allows
this combination and the corruption was exposed by device replace fixup
code.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: refactor block group replication factor calculation to a helper
David Sterba [Fri, 13 Jul 2018 18:46:30 +0000 (20:46 +0200)]
btrfs: refactor block group replication factor calculation to a helper

There are many places that open code the duplicity factor of the block
group profiles, create a common helper. This can be easily extended for
more copies.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use the assigned fs_devices instead of the dereference
Anand Jain [Mon, 16 Jul 2018 14:58:09 +0000 (22:58 +0800)]
btrfs: use the assigned fs_devices instead of the dereference

We have assigned the %fs_info->fs_devices in %fs_devices as its not
modified just use it for the mutex_lock().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from qgroup_rescan_leaf
Lu Fengqi [Wed, 18 Jul 2018 06:45:42 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from qgroup_rescan_leaf

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_inherit
Lu Fengqi [Wed, 18 Jul 2018 06:45:41 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_inherit

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_run_qgroups
Lu Fengqi [Wed, 18 Jul 2018 06:45:40 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_run_qgroups

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_account_extent
Lu Fengqi [Wed, 18 Jul 2018 06:45:39 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_account_extent

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop root parameter from btrfs_qgroup_trace_subtree
Lu Fengqi [Wed, 18 Jul 2018 06:45:38 +0000 (14:45 +0800)]
btrfs: qgroup: Drop root parameter from btrfs_qgroup_trace_subtree

The fs_info can be fetched from the transaction handle directly.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_trace_leaf_items
Lu Fengqi [Wed, 18 Jul 2018 06:45:37 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_trace_leaf_items

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_trace_extent
Lu Fengqi [Wed, 18 Jul 2018 08:28:03 +0000 (16:28 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_qgroup_trace_extent

It can be fetched from the transaction handle. In addition, remove the
WARN_ON(trans == NULL) because it's not possible to hit this condition.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_limit_qgroup
Lu Fengqi [Wed, 18 Jul 2018 06:45:35 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_limit_qgroup

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_remove_qgroup
Lu Fengqi [Wed, 18 Jul 2018 06:45:34 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_remove_qgroup

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_create_qgroup
Lu Fengqi [Wed, 18 Jul 2018 06:45:33 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_create_qgroup

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_del_qgroup_relation
Lu Fengqi [Wed, 18 Jul 2018 06:45:32 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_del_qgroup_relation

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from __del_qgroup_relation
Lu Fengqi [Wed, 18 Jul 2018 06:45:31 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from __del_qgroup_relation

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop fs_info parameter from btrfs_add_qgroup_relation
Lu Fengqi [Wed, 18 Jul 2018 06:45:30 +0000 (14:45 +0800)]
btrfs: qgroup: Drop fs_info parameter from btrfs_add_qgroup_relation

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop quota_root and fs_info parameters from update_qgroup_status_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:29 +0000 (14:45 +0800)]
btrfs: qgroup: Drop quota_root and fs_info parameters from update_qgroup_status_item

They can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop root parameter from update_qgroup_info_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:28 +0000 (14:45 +0800)]
btrfs: qgroup: Drop root parameter from update_qgroup_info_item

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop root parameter from update_qgroup_limit_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:27 +0000 (14:45 +0800)]
btrfs: qgroup: Drop root parameter from update_qgroup_limit_item

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop quota_root parameter from del_qgroup_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:26 +0000 (14:45 +0800)]
btrfs: qgroup: Drop quota_root parameter from del_qgroup_item

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop quota_root parameter from del_qgroup_relation_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:25 +0000 (14:45 +0800)]
btrfs: qgroup: Drop quota_root parameter from del_qgroup_relation_item

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: Drop quota_root parameter from add_qgroup_relation_item
Lu Fengqi [Wed, 18 Jul 2018 06:45:24 +0000 (14:45 +0800)]
btrfs: qgroup: Drop quota_root parameter from add_qgroup_relation_item

It can be fetched from the transaction handle.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: rename btrfs_parse_early_options
Anand Jain [Mon, 16 Jul 2018 14:18:07 +0000 (22:18 +0800)]
btrfs: rename btrfs_parse_early_options

Rename btrfs_parse_early_options() to btrfs_parse_device_options(). As
btrfs_parse_early_options() parses the -o device options and scan the
device provided. So this rename specifies its action. Also the function
name is in line with btrfs_parse_subvol_options().
No functional changes.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroup: cleanup the unused srcroot from btrfs_qgroup_inherit
Lu Fengqi [Tue, 17 Jul 2018 08:58:22 +0000 (16:58 +0800)]
btrfs: qgroup: cleanup the unused srcroot from btrfs_qgroup_inherit

Since commit 0b246afa62b0 ("btrfs: root->fs_info cleanup, add fs_info
convenience variables"), the srcroot is no longer used to get
fs_info::nodesize.  In fact, it can be dropped after commit 707e8a071528
("btrfs: use nodesize everywhere, kill leafsize").

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Use btrfs_mark_bg_unused to replace open code
Qu Wenruo [Tue, 22 May 2018 08:43:47 +0000 (16:43 +0800)]
btrfs: Use btrfs_mark_bg_unused to replace open code

Introduce a small helper, btrfs_mark_bg_unused(), to acquire locks and
add a block group to unused_bgs list.

No functional modification, and only 3 callers are involved.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Rewrite retry logic in do_chunk_alloc
Nikolay Borisov [Wed, 18 Apr 2018 07:27:57 +0000 (10:27 +0300)]
btrfs: Rewrite retry logic in do_chunk_alloc

do_chunk_alloc implements logic to detect whether there is currently
pending chunk allocation (by means of space_info->chunk_alloc being
set) and if so it loops around to the 'again' label. Additionally,
based on the state of the space_info (e.g. whether it's full or not)
and the return value of should_alloc_chunk() it decides whether this
is a "hard" error (ENOSPC) or we can just return 0.

This patch refactors all of this:

1. Put order to the scattered ifs handling the various cases in an
easy-to-read if {} else if{} branches. This makes clear the various
cases we are interested in handling.

2. Call should_alloc_chunk only once and use the result in the
if/else if constructs. All of this is done under space_info->lock, so
even before multiple calls of should_alloc_chunk were unnecessary.

3. Rewrite the "do {} while()" loop currently implemented via label
into an explicit loop construct.

4. Move the mutex locking for the case where the caller is the one doing
the allocation. For the case where the caller needs to wait a concurrent
allocation, introduce a pair of mutex_lock/mutex_unlock to act as a
barrier and reword the comment.

5. Switch local vars to bool type where pertinent.

All in all this shouldn't introduce any functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use customized batch size for total_bytes_pinned
Ethan Lien [Fri, 13 Jul 2018 08:50:42 +0000 (16:50 +0800)]
btrfs: use customized batch size for total_bytes_pinned

In commit b150a4f10d878 ("Btrfs: use a percpu to keep track of possibly
pinned bytes") we use total_bytes_pinned to track how many bytes we are
going to free in this transaction. When we are close to ENOSPC, we check it
and know if we can make the allocation by commit the current transaction.
For every data/metadata extent we are going to free, we add
total_bytes_pinned in btrfs_free_extent() and btrfs_free_tree_block(), and
release it in unpin_extent_range() when we finish the transaction. So this
is a variable we frequently update but rarely read - just the suitable
use of percpu_counter. But in previous commit we update total_bytes_pinned
by default 32 batch size, making every update essentially a spin lock
protected update. Since every spin lock/unlock operation involves syncing
a globally used variable and some kind of barrier in a SMP system, this is
more expensive than using total_bytes_pinned as a simple atomic64_t.

So fix this by using a customized batch size. Since we only read
total_bytes_pinned when we are close to ENOSPC and fail to allocate new
chunk, we can use a really large batch size and have nearly no penalty
in most cases.

[Test]
We tested the patch on a 4-cores x86 machine:

1. fallocate a 16GiB size test file
2. take snapshot (so all following writes will be COW)
3. run a 180 sec, 4 jobs, 4K random write fio on test file

We also added a temporary lockdep class on percpu_counter's spin lock
used by total_bytes_pinned to track it by lock_stat.

[Results]
unpatched:
lock_stat version 0.4
-----------------------------------------------------------------------
                              class name    con-bounces    contentions
waittime-min   waittime-max waittime-total   waittime-avg    acq-bounces
acquisitions   holdtime-min   holdtime-max holdtime-total   holdtime-avg

               total_bytes_pinned_percpu:            82             82
        0.21           0.61          29.46           0.36         298340
      635973           0.09          11.01      173476.25           0.27

patched:
lock_stat version 0.4
-----------------------------------------------------------------------
                              class name    con-bounces    contentions
waittime-min   waittime-max waittime-total   waittime-avg    acq-bounces
acquisitions   holdtime-min   holdtime-max holdtime-total   holdtime-avg

               total_bytes_pinned_percpu:             1              1
        0.62           0.62           0.62           0.62          13601
       31542           0.14           9.61       11016.90           0.35

[Analysis]
Since the spin lock only protects a single in-memory variable, the
contentions (number of lock acquisitions that had to wait) in both
unpatched and patched version are low. But when we see acquisitions and
acq-bounces, we get much lower counts in patched version. Here the most
important metric is acq-bounces. It means how many times the lock gets
transferred between different cpus, so the patch can really reduce
cacheline bouncing of spin lock (also the global counter of percpu_counter)
in a SMP system.

Fixes: b150a4f10d878 ("Btrfs: use a percpu to keep track of possibly pinned bytes")
Signed-off-by: Ethan Lien <ethanlien@synology.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use correct compare function of dirty_metadata_bytes
Ethan Lien [Mon, 2 Jul 2018 07:44:58 +0000 (15:44 +0800)]
btrfs: use correct compare function of dirty_metadata_bytes

We use customized, nodesize batch value to update dirty_metadata_bytes.
We should also use batch version of compare function or we will easily
goto fast path and get false result from percpu_counter_compare().

Fixes: e2d845211eda ("Btrfs: use percpu counter for dirty metadata count")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Ethan Lien <ethanlien@synology.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: return device pointer from btrfs_scan_one_device
Gu Jinxiang [Thu, 12 Jul 2018 06:23:16 +0000 (14:23 +0800)]
btrfs: return device pointer from btrfs_scan_one_device

Return device pointer (with the IS_ERR semantics) from
btrfs_scan_one_device so we don't have to return in through pointer.

And since btrfs_fs_devices can be obtained from btrfs_device, return that.

Signed-off-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ fixed conflics after recent changes to btrfs_scan_one_device ]
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: make fs_devices a local variable in btrfs_parse_early_options
Gu Jinxiang [Thu, 12 Jul 2018 06:23:15 +0000 (14:23 +0800)]
btrfs: make fs_devices a local variable in btrfs_parse_early_options

fs_devices is always passed to btrfs_scan_one_device which overrides it.
In the call stack below fs_devices is passed to btrfs_scan_one_device
from btrfs_mount_root.  In btrfs_mount_root the output fs_devices of
this call stack is not used.

btrfs_mount_root
  btrfs_parse_early_options
    btrfs_scan_one_device

So, it is not necessary to pass fs_devices from btrfs_mount_root, using
a local variable in btrfs_parse_early_options is enough.

Signed-off-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: Anand Jain <Anand.Jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: fix mount and ioctl device scan ioctl race
David Sterba [Tue, 19 Jun 2018 16:04:07 +0000 (18:04 +0200)]
btrfs: fix mount and ioctl device scan ioctl race

Technically this extends the critical section covered by uuid_mutex to:

- parse early mount options -- here we can call device scan on paths
  that can be passed as 'device=/dev/...'

- scan the device passed to mount

- open the devices related to the fs_devices -- this increases
  fs_devices::opened

The race can happen when mount calls one of the scans and there's
another one called eg. by mkfs or 'btrfs dev scan':

Mount                                  Scan
-----                                  ----
scan_one_device (dev1, fsid1)
                                       scan_one_device (dev2, fsid1)
           add the device
   free stale devices
       fsid1 fs_devices::opened == 0
           find fsid1:dev1
           free fsid1:dev1
           if it's the last one,
            free fs_devices of fsid1
    too

open_devices (dev1, fsid1)
   dev1 not found

When fixed, the uuid mutex will make sure that mount will increase
fs_devices::opened and this will not be touched by the racing scan
ioctl.

Reported-and-tested-by: syzbot+909a5177749d7990ffa4@syzkaller.appspotmail.com
Reported-and-tested-by: syzbot+ceb2606025ec1cc3479c@syzkaller.appspotmail.com
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: reorder initialization before the mount locks uuid_mutex
David Sterba [Tue, 19 Jun 2018 16:01:24 +0000 (18:01 +0200)]
btrfs: reorder initialization before the mount locks uuid_mutex

In preparation to take a big lock, move resource initialization before
the critical section. It's not obvious from the diff, the desired order
is:

- initialize mount security options
- allocate temporary fs_info
- allocate superblock buffers

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: lift uuid_mutex to callers of btrfs_parse_early_options
David Sterba [Tue, 19 Jun 2018 15:50:25 +0000 (17:50 +0200)]
btrfs: lift uuid_mutex to callers of btrfs_parse_early_options

Prepartory work to fix race between mount and device scan.

btrfs_parse_early_options calls the device scan from mount and we'll
need to let mount completely manage the critical section.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: lift uuid_mutex to callers of btrfs_open_devices
David Sterba [Tue, 19 Jun 2018 15:09:47 +0000 (17:09 +0200)]
btrfs: lift uuid_mutex to callers of btrfs_open_devices

Prepartory work to fix race between mount and device scan.

The callers will have to manage the critical section, eg. mount wants to
scan and then call btrfs_open_devices without the ioctl scan walking in
and modifying the fs devices in the meantime.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: lift uuid_mutex to callers of btrfs_scan_one_device
David Sterba [Tue, 19 Jun 2018 14:37:36 +0000 (16:37 +0200)]
btrfs: lift uuid_mutex to callers of btrfs_scan_one_device

Prepartory work to fix race between mount and device scan.

The callers will have to manage the critical section, eg. mount wants to
scan and then call btrfs_open_devices without the ioctl scan walking in
and modifying the fs devices in the meantime.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use device_list_mutex when removing stale devices
Anand Jain [Tue, 29 May 2018 09:23:20 +0000 (17:23 +0800)]
btrfs: use device_list_mutex when removing stale devices

btrfs_free_stale_devices() finds a stale (not opened) device matching
path in the fs_uuid list. We are already under uuid_mutex so when we
check for each fs_devices, hold the device_list_mutex too.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: rename local devices for fs_devices in btrfs_free_stale_devices(
Anand Jain [Tue, 29 May 2018 07:33:08 +0000 (15:33 +0800)]
btrfs: rename local devices for fs_devices in btrfs_free_stale_devices(

Over the years we named %fs_devices and %devices to represent the
struct btrfs_fs_devices and the struct btrfs_device. So follow the same
scheme here too. No functional changes.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: extend locked section when adding a new device in device_list_add
Anand Jain [Tue, 29 May 2018 06:10:20 +0000 (14:10 +0800)]
btrfs: extend locked section when adding a new device in device_list_add

Make sure the device_list_lock is held the whole time:

* when the device is being looked up
* new device is initialized and put to the list
* the list counters are updated (fs_devices::opened, fs_devices::total_devices)

Signed-off-by: Anand Jain <anand.jain@oracle.com>
[ update changelog ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: do btrfs_free_stale_devices outside of device_list_add
Anand Jain [Tue, 29 May 2018 04:28:37 +0000 (12:28 +0800)]
btrfs: do btrfs_free_stale_devices outside of device_list_add

btrfs_free_stale_devices() looks for device path reused for another
filesystem, and deletes the older fs_devices::device entry.

In preparation to handle locking in device_list_add, move
btrfs_free_stale_devices outside as these two functions serve a
different purpose.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: close devices without offloading to a temporary list
Nikolay Borisov [Fri, 29 Jun 2018 05:26:05 +0000 (08:26 +0300)]
btrfs: close devices without offloading to a temporary list

Since commit 88c14590cdd6 ("btrfs: use RCU in btrfs_show_devname for
device list traversal") btrfs_show_devname no longer takes
device_list_mutex. As such the deadlock that 0ccd05285e7f ("btrfs: fix a
possible umount deadlock") aimed to fix no longer exists, we can free
the devices immediatelly and remove the code that does the pending work.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
[ update changelog ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove unused function btrfs_account_dev_extents_size
Qu Wenruo [Mon, 9 Jul 2018 06:52:54 +0000 (14:52 +0800)]
btrfs: Remove unused function btrfs_account_dev_extents_size

This function is not used since the alloc_start parameter has been
obsoleted in commit 0d0c71b317207082856 ("btrfs: obsolete and remove
mount option alloc_start").

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: remove unused parameter from btrfs_parse_subvol_options
Gu Jinxiang [Mon, 9 Jul 2018 06:39:15 +0000 (14:39 +0800)]
btrfs: remove unused parameter from btrfs_parse_subvol_options

Since parameter flags is no more used since commit d7407606564c ("btrfs:
split parse_early_options() in two"), remove it.

Signed-off-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: fix in-memory value of total_devices after seed device deletion
Anand Jain [Tue, 3 Jul 2018 09:07:23 +0000 (17:07 +0800)]
btrfs: fix in-memory value of total_devices after seed device deletion

In case of deleting the seed device the %cur_devices (seed) and the
%fs_devices (parent) are different. Now, as the parent
fs_devices::total_devices also maintains the total number of devices
including the seed device, so decrement its in-memory value for the
successful seed delete. We are already updating its corresponding
on-disk btrfs_super_block::number_devices value.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: qgroups: Move transaction management inside btrfs_quota_enable/disable
Nikolay Borisov [Thu, 5 Jul 2018 11:50:48 +0000 (14:50 +0300)]
btrfs: qgroups: Move transaction management inside btrfs_quota_enable/disable

Commit 5d23515be669 ("btrfs: Move qgroup rescan on quota enable to
btrfs_quota_enable") not only resulted in an easier to follow code but
it also introduced a subtle bug. It changed the timing when the initial
transaction rescan was happening:

- before the commit: it would happen after transaction commit had occured
- after the commit: it might happen before the transaction was committed

This results in failure to correctly rescan the quota since there could
be data which is still not committed on disk.

This patch aims to fix this by moving the transaction creation/commit
inside btrfs_quota_enable, which allows to schedule the quota commit
after the transaction has been committed.

Fixes: 5d23515be669 ("btrfs: Move qgroup rescan on quota enable to btrfs_quota_enable")
Reported-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Link: https://marc.info/?l=linux-btrfs&m=152999289017582
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: catch errors from full_stripe_write
David Sterba [Fri, 29 Jun 2018 08:57:10 +0000 (10:57 +0200)]
btrfs: raid56: catch errors from full_stripe_write

Add fall-back code to catch failure of full_stripe_write. Proper error
handling from inside run_plug would need more code restructuring as it's
called at arbitrary points by io scheduler.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: merge rbio_is_full helpers
David Sterba [Fri, 29 Jun 2018 08:57:05 +0000 (10:57 +0200)]
btrfs: raid56: merge rbio_is_full helpers

There's only one call site of the unlocked helper so it can be folded
into the caller.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: use new helper for async_scrub_parity
David Sterba [Fri, 29 Jun 2018 08:57:03 +0000 (10:57 +0200)]
btrfs: raid56: use new helper for async_scrub_parity

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: use new helper for async_read_rebuild
David Sterba [Fri, 29 Jun 2018 08:57:00 +0000 (10:57 +0200)]
btrfs: raid56: use new helper for async_read_rebuild

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: use new helper for async_rmw_stripe
David Sterba [Fri, 29 Jun 2018 08:56:58 +0000 (10:56 +0200)]
btrfs: raid56: use new helper for async_rmw_stripe

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: raid56: add new helper for starting async work
David Sterba [Fri, 29 Jun 2018 08:56:56 +0000 (10:56 +0200)]
btrfs: raid56: add new helper for starting async work

Add helper that schedules a given function to run on the rmw workqueue.
This will replace several standalone helpers.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: open-code bio_set_op_attrs
David Sterba [Fri, 29 Jun 2018 08:56:53 +0000 (10:56 +0200)]
btrfs: open-code bio_set_op_attrs

The helper is trivial and marked as deprecated.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: switch types to int when counting eb pages
David Sterba [Thu, 1 Mar 2018 17:20:27 +0000 (18:20 +0100)]
btrfs: switch types to int when counting eb pages

The loops iterating eb pages use unsigned long, that's an overkill as
we know that there are at most 16 pages (64k / 4k), and 4 by default
(with nodesize 16k).

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use round_up wrapper in num_extent_pages
David Sterba [Wed, 4 Jul 2018 15:49:31 +0000 (17:49 +0200)]
btrfs: use round_up wrapper in num_extent_pages

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: pass only eb to num_extent_pages
David Sterba [Fri, 29 Jun 2018 08:56:49 +0000 (10:56 +0200)]
btrfs: pass only eb to num_extent_pages

Almost all callers pass the start and len as 2 arguments but this is not
necessary, all the information is provided by the eb. By reordering the
calls to num_extent_pages, we don't need the local variables with
start/len.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: prune unused includes
David Sterba [Fri, 29 Jun 2018 08:56:47 +0000 (10:56 +0200)]
btrfs: prune unused includes

Remove includes if none of the interfaces and exports is used in the
given source file.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use copy_page for copying pages instead of memcpy
David Sterba [Fri, 29 Jun 2018 08:56:44 +0000 (10:56 +0200)]
btrfs: use copy_page for copying pages instead of memcpy

Use the helper that's possibly optimized for full page copies.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: simplify pointer chasing of local fs_info variables
David Sterba [Fri, 29 Jun 2018 08:56:42 +0000 (10:56 +0200)]
btrfs: simplify pointer chasing of local fs_info variables

Functions that get btrfs inode can simply reach the fs_info by
dereferencing the root and this looks a bit more straightforward
compared to the btrfs_sb(...) indirection.

If the transaction handle is available and not NULL it's used instead.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: simplify some assignments of inode numbers
David Sterba [Fri, 29 Jun 2018 08:56:40 +0000 (10:56 +0200)]
btrfs: simplify some assignments of inode numbers

There are several places when the btrfs inode is converted to the
generic inode, back to btrfs and then passed to btrfs_ino. We can remove
the extra back and forth conversions.

Signed-off-by: David Sterba <dsterba@suse.com>
3 years agoBtrfs: free space cache: make sure there is always room for generation number
Zhihui Zhang [Tue, 3 Jul 2018 00:00:54 +0000 (20:00 -0400)]
Btrfs: free space cache: make sure there is always room for generation number

io_ctl_set_generation() assumes that the generation number shares
the same page with inline CRCs. Let's make sure this is always true.

Signed-off-by: Zhihui Zhang <zzhsuny@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: drop unnecessary variable in btrfs_init_new_device
Anand Jain [Tue, 3 Jul 2018 05:14:51 +0000 (13:14 +0800)]
btrfs: drop unnecessary variable in btrfs_init_new_device

There is only usage of the declared devices variable, instead use its
value directly.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use a temporary variable for fs_devices in btrfs_init_new_device
Anand Jain [Tue, 3 Jul 2018 05:14:50 +0000 (13:14 +0800)]
btrfs: use a temporary variable for fs_devices in btrfs_init_new_device

There are many instances of the %fs_info->fs_devices pointer
dereferences, use a temporary variable instead.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: relocation: Only remove reloc rb_trees if reloc control has been initialized
Qu Wenruo [Tue, 3 Jul 2018 09:10:07 +0000 (17:10 +0800)]
btrfs: relocation: Only remove reloc rb_trees if reloc control has been initialized

Invalid reloc tree can cause kernel NULL pointer dereference when btrfs
does some cleanup of the reloc roots.

It turns out that fs_info::reloc_ctl can be NULL in
btrfs_recover_relocation() as we allocate relocation control after all
reloc roots have been verified.
So when we hit: note, we haven't called set_reloc_control() thus
fs_info::reloc_ctl is still NULL.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=199833
Reported-by: Xu Wen <wen.xu@gatech.edu>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Tested-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: tree-checker: Detect invalid and empty essential trees
Qu Wenruo [Tue, 3 Jul 2018 09:10:06 +0000 (17:10 +0800)]
btrfs: tree-checker: Detect invalid and empty essential trees

A crafted image has empty root tree block, which will later cause NULL
pointer dereference.

The following trees should never be empty:
1) Tree root
   Must contain at least root items for extent tree, device tree and fs
   tree

2) Chunk tree
   Or we can't even bootstrap as it contains the mapping.

3) Fs tree
   At least inode item for top level inode (.).

4) Device tree
   Dev extents for chunks

5) Extent tree
   Must have corresponding extent for each chunk.

If any of them is empty, we are sure the fs is corrupted and no need to
mount it.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=199847
Reported-by: Xu Wen <wen.xu@gatech.edu>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Tested-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: tree-checker: Verify block_group_item
Qu Wenruo [Tue, 3 Jul 2018 09:10:05 +0000 (17:10 +0800)]
btrfs: tree-checker: Verify block_group_item

A crafted image with invalid block group items could make free space cache
code to cause panic.

We could detect such invalid block group item by checking:
1) Item size
   Known fixed value.
2) Block group size (key.offset)
   We have an upper limit on block group item (10G)
3) Chunk objectid
   Known fixed value.
4) Type
   Only 4 valid type values, DATA, METADATA, SYSTEM and DATA|METADATA.
   No more than 1 bit set for profile type.
5) Used space
   No more than the block group size.

This should allow btrfs to detect and refuse to mount the crafted image.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=199849
Reported-by: Xu Wen <wen.xu@gatech.edu>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Tested-by: Gu Jinxiang <gujx@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: annotate unlikely branches after V0 extent type removal
David Sterba [Tue, 26 Jun 2018 14:20:59 +0000 (16:20 +0200)]
btrfs: annotate unlikely branches after V0 extent type removal

The v0 extent type checks are the right case for the unlikely
annotations as we don't expect to ever see them, so let's give the
compiler some hint.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Add graceful handling of V0 extents
Nikolay Borisov [Tue, 26 Jun 2018 13:57:36 +0000 (16:57 +0300)]
btrfs: Add graceful handling of V0 extents

Following the removal of the v0 handling code let's be courteous and
print an error message when such extents are handled. In the cases
where we have a transaction just abort it, otherwise just call
btrfs_handle_fs_error. Both cases result in the FS being re-mounted RO.

In case the error handling would be too intrusive, leave the BUG_ON in
place, like extent_data_ref_count, other proper handling would catch
that earlier.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove V0 extent support
Nikolay Borisov [Thu, 21 Jun 2018 06:45:00 +0000 (09:45 +0300)]
btrfs: Remove V0 extent support

The v0 compat code was introduced in commit 5d4f98a28c7d
("Btrfs: Mixed back reference  (FORWARD ROLLING FORMAT CHANGE)") 9
years ago, which was merged in 2.6.31. This means that the code is
there to support filesystems which are _VERY_ old and if you are using
btrfs on such an old kernel, you have much bigger problems. This coupled
with the fact that no one is likely testing/maintining this code likely
means it has bugs lurking. All things considered I think 43 kernel
releases later it's high time this remnant of the past got removed.

This patch removes all code wrapped in #ifdefs but leaves the BUG_ONs in case
we have a v0 with no support intact as a sort of safety-net.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: remove unnecessary curly braces in btrfs_get_acl
Chengguang Xu [Wed, 27 Jun 2018 04:16:38 +0000 (12:16 +0800)]
btrfs: remove unnecessary curly braces in btrfs_get_acl

It's only coding style fix not functinal change.  When if/else has only
one statement then the braces are not needed.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: avoid error code override in btrfs_get_acl
Chengguang Xu [Wed, 27 Jun 2018 04:16:37 +0000 (12:16 +0800)]
btrfs: avoid error code override in btrfs_get_acl

It's not good to override the error code when failing from
btrfs_getxattr() in btrfs_get_acl() because it hides the real reason of
the failure.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: remove unnecessary -ERANGE check in btrfs_get_acl
Chengguang Xu [Wed, 27 Jun 2018 04:16:36 +0000 (12:16 +0800)]
btrfs: remove unnecessary -ERANGE check in btrfs_get_acl

There is no chance to get into -ERANGE error condition because we first
call btrfs_getxattr to get the length of the attribute, then we do a
subsequent call with the size from the first call.  Between the 2 calls
the size shouldn't change. So remove the unnecessary -ERANGE error
check.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: replace empty string with NULL when getting attribute length in btrfs_get_acl
Chengguang Xu [Wed, 27 Jun 2018 04:16:35 +0000 (12:16 +0800)]
btrfs: replace empty string with NULL when getting attribute length in btrfs_get_acl

In btrfs_get_acl() the first call of btr_getxattr() is for getting the
length of attribute, the value buffer is never used in this case. So
it's better to replace empty string with NULL.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: return error instead of crash when detecting unexpected type in btrfs_get_acl
Chengguang Xu [Wed, 27 Jun 2018 04:16:34 +0000 (12:16 +0800)]
btrfs: return error instead of crash when detecting unexpected type in btrfs_get_acl

The caller of btrfs_get_acl() checks error condition so there is no
impact from this change. In practice there is no chance to get into
default case of switch statement because VFS has already checked the
type.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: return EUCLEAN if extent_inline_ref type is invalid
Su Yue [Fri, 22 Jun 2018 08:18:01 +0000 (16:18 +0800)]
btrfs: return EUCLEAN if extent_inline_ref type is invalid

If type of extent_inline_ref found is not expected, filesystem may have
been corrupted, should return EUCLEAN instead of EINVAL.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Use iocb to derive pos instead of passing a separate parameter
Goldwyn Rodrigues [Sun, 17 Jun 2018 17:39:47 +0000 (12:39 -0500)]
btrfs: Use iocb to derive pos instead of passing a separate parameter

struct kiocb carries the ki_pos, so there is no need to pass it as
a separate function parameter.

generic_file_direct_write() increments ki_pos, so we now assign pos
after the function.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
[ rename to btrfs_buffered_write ]
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: print more details when checking tree block finds a problem
Su Yue [Fri, 22 Jun 2018 01:52:15 +0000 (09:52 +0800)]
btrfs: print more details when checking tree block finds a problem

For easier debugging, print eb->start if level is invalid.  Also make
clear if bytenr found is not expected.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Streamline memory allocation failure handling in btrfs_add_delayed_tree_ref
Nikolay Borisov [Wed, 20 Jun 2018 15:43:12 +0000 (18:43 +0300)]
btrfs: Streamline memory allocation failure handling in btrfs_add_delayed_tree_ref

Currently the function uses 2 goto labels to properly handle allocation
failures. This could be simplified by simply re-arranging the code so
that allocations are the in the beginning of the function. This allows
to use simple return statements. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Su Yue <suy.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Don't remove block group that still has pinned down bytes
Qu Wenruo [Fri, 22 Jun 2018 04:35:00 +0000 (12:35 +0800)]
btrfs: Don't remove block group that still has pinned down bytes

[BUG]
Under certain KVM load and LTP tests, it is possible to hit the
following calltrace if quota is enabled:

BTRFS critical (device vda2): unable to find logical 8820195328 length 4096
BTRFS critical (device vda2): unable to find logical 8820195328 length 4096

WARNING: CPU: 0 PID: 49 at ../block/blk-core.c:172 blk_status_to_errno+0x1a/0x30
CPU: 0 PID: 49 Comm: kworker/u2:1 Not tainted 4.12.14-15-default #1 SLE15 (unreleased)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
task: ffff9f827b340bc0 task.stack: ffffb4f8c0304000
RIP: 0010:blk_status_to_errno+0x1a/0x30
Call Trace:
 submit_extent_page+0x191/0x270 [btrfs]
 ? btrfs_create_repair_bio+0x130/0x130 [btrfs]
 __do_readpage+0x2d2/0x810 [btrfs]
 ? btrfs_create_repair_bio+0x130/0x130 [btrfs]
 ? run_one_async_done+0xc0/0xc0 [btrfs]
 __extent_read_full_page+0xe7/0x100 [btrfs]
 ? run_one_async_done+0xc0/0xc0 [btrfs]
 read_extent_buffer_pages+0x1ab/0x2d0 [btrfs]
 ? run_one_async_done+0xc0/0xc0 [btrfs]
 btree_read_extent_buffer_pages+0x94/0xf0 [btrfs]
 read_tree_block+0x31/0x60 [btrfs]
 read_block_for_search.isra.35+0xf0/0x2e0 [btrfs]
 btrfs_search_slot+0x46b/0xa00 [btrfs]
 ? kmem_cache_alloc+0x1a8/0x510
 ? btrfs_get_token_32+0x5b/0x120 [btrfs]
 find_parent_nodes+0x11d/0xeb0 [btrfs]
 ? leaf_space_used+0xb8/0xd0 [btrfs]
 ? btrfs_leaf_free_space+0x49/0x90 [btrfs]
 ? btrfs_find_all_roots_safe+0x93/0x100 [btrfs]
 btrfs_find_all_roots_safe+0x93/0x100 [btrfs]
 btrfs_find_all_roots+0x45/0x60 [btrfs]
 btrfs_qgroup_trace_extent_post+0x20/0x40 [btrfs]
 btrfs_add_delayed_data_ref+0x1a3/0x1d0 [btrfs]
 btrfs_alloc_reserved_file_extent+0x38/0x40 [btrfs]
 insert_reserved_file_extent.constprop.71+0x289/0x2e0 [btrfs]
 btrfs_finish_ordered_io+0x2f4/0x7f0 [btrfs]
 ? pick_next_task_fair+0x2cd/0x530
 ? __switch_to+0x92/0x4b0
 btrfs_worker_helper+0x81/0x300 [btrfs]
 process_one_work+0x1da/0x3f0
 worker_thread+0x2b/0x3f0
 ? process_one_work+0x3f0/0x3f0
 kthread+0x11a/0x130
 ? kthread_create_on_node+0x40/0x40
 ret_from_fork+0x35/0x40

BTRFS critical (device vda2): unable to find logical 8820195328 length 16384
BTRFS: error (device vda2) in btrfs_finish_ordered_io:3023: errno=-5 IO failure
BTRFS info (device vda2): forced readonly
BTRFS error (device vda2): pending csums is 2887680

[CAUSE]
It's caused by race with block group auto removal:

- There is a meta block group X, which has only one tree block
  The tree block belongs to fs tree 257.
- In current transaction, some operation modified fs tree 257
  The tree block gets COWed, so the block group X is empty, and marked
  as unused, queued to be deleted.
- Some workload (like fsync) wakes up cleaner_kthread()
  Which will call btrfs_delete_unused_bgs() to remove unused block
  groups.
  So block group X along its chunk map get removed.
- Some delalloc work finished for fs tree 257
  Quota needs to get the original reference of the extent, which will
  read tree blocks of commit root of 257.
  Then since the chunk map gets removed, the above warning gets
  triggered.

[FIX]
Just let btrfs_delete_unused_bgs() skip block group which still has
pinned bytes.

However there is a minor side effect: currently we only queue empty
blocks at update_block_group(), and such empty block group with pinned
bytes won't go through update_block_group() again, such block group
won't be removed, until it gets new extent allocated and removed.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Refactor count handling in btrfs_unpin_free_ino
Geert Uytterhoeven [Fri, 22 Jun 2018 07:18:29 +0000 (09:18 +0200)]
btrfs: Refactor count handling in btrfs_unpin_free_ino

With gcc 4.1.2:

    fs/btrfs/inode-map.c: In function ‘btrfs_unpin_free_ino’:
    fs/btrfs/inode-map.c:241: warning: ‘count’ may be used uninitialized in this function

While this warning is a false-positive, it can easily be killed by
refactoring the code.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use timespec64 for i_otime
Arnd Bergmann [Thu, 21 Jun 2018 16:04:06 +0000 (18:04 +0200)]
btrfs: use timespec64 for i_otime

While the regular inode timestamps all use timespec64 now, the i_otime
field is btrfs specific and still needs to be converted to correctly
represent times beyond 2038.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: use monotonic time for transaction handling
Arnd Bergmann [Thu, 21 Jun 2018 16:04:05 +0000 (18:04 +0200)]
btrfs: use monotonic time for transaction handling

The transaction times were changed to ktime_get_real_seconds to avoid
the y2038 overflow, but they still have a minor problem when they go
backwards or jump due to settimeofday() or leap seconds.

This changes the transaction handling to instead use ktime_get_seconds(),
which returns a CLOCK_MONOTONIC timestamp that has neither of those
problems.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Get rid of the confusing btrfs_file_extent_inline_len
Qu Wenruo [Wed, 6 Jun 2018 07:41:49 +0000 (15:41 +0800)]
btrfs: Get rid of the confusing btrfs_file_extent_inline_len

We used to call btrfs_file_extent_inline_len() to get the uncompressed
data size of an inlined extent.

However this function is hiding evil, for compressed extent, it has no
choice but to directly read out ram_bytes from btrfs_file_extent_item.
While for uncompressed extent, it uses item size to calculate the real
data size, and ignoring ram_bytes completely.

In fact, for corrupted ram_bytes, due to above behavior kernel
btrfs_print_leaf() can't even print correct ram_bytes to expose the bug.

Since we have the tree-checker to verify all EXTENT_DATA, such mismatch
can be detected pretty easily, thus we can trust ram_bytes without the
evil btrfs_file_extent_inline_len().

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Deduplicate extent_buffer init code
Nikolay Borisov [Mon, 18 Jun 2018 11:13:19 +0000 (14:13 +0300)]
btrfs: Deduplicate extent_buffer init code

When a new extent buffer is allocated there are a few mandatory fields
which need to be set in order for the buffer to be sane: level,
generation, bytenr, backref_rev, owner and FSID/UUID. Currently this
is open coded in the callers of btrfs_alloc_tree_block, meaning it's
fairly high in the abstraction hierarchy of operations. This patch
solves this by simply moving this init code in btrfs_init_new_buffer,
since this is the function which initializes a newly allocated
extent buffer. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: check-integrity: Fix NULL pointer dereference for degraded mount
Qu Wenruo [Wed, 20 Jun 2018 07:38:58 +0000 (15:38 +0800)]
btrfs: check-integrity: Fix NULL pointer dereference for degraded mount

Commit f8f84b2dfda5 ("btrfs: index check-integrity state hash by a dev_t")
changed how btrfsic indexes device state.

Now we need to access device->bdev->bd_dev, while for degraded mount
it's completely possible to have device->bdev as NULL, thus it will
trigger a NULL pointer dereference at mount time.

Fix it by checking if the device is degraded before accessing
device->bdev->bd_dev.

There are a lot of other places accessing device->bdev->bd_dev, however
the other call sites have either checked device->bdev, or the
device->bdev is passed from btrfsic_map_block(), so it won't cause harm.

Fixes: f8f84b2dfda5 ("btrfs: index check-integrity state hash by a dev_t")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from btrfs_force_chunk_alloc
Nikolay Borisov [Wed, 20 Jun 2018 12:49:15 +0000 (15:49 +0300)]
btrfs: Remove fs_info from btrfs_force_chunk_alloc

It can be referenced from the passed transaction handle.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from btrfs_inc_block_group_ro
Nikolay Borisov [Wed, 20 Jun 2018 12:49:14 +0000 (15:49 +0300)]
btrfs: Remove fs_info from btrfs_inc_block_group_ro

It can be referenced from the passed bg cache.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from btrfs_alloc_logged_file_extent
Nikolay Borisov [Wed, 20 Jun 2018 12:49:13 +0000 (15:49 +0300)]
btrfs: Remove fs_info from btrfs_alloc_logged_file_extent

It can be referenced from trans since the function is always called
within a valid transaction.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from remove_extent_backref
Nikolay Borisov [Wed, 20 Jun 2018 12:49:12 +0000 (15:49 +0300)]
btrfs: Remove fs_info from remove_extent_backref

It can be referenced directly from the transaction handle since it's
always valid.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from run_one_delayed_ref
Nikolay Borisov [Wed, 20 Jun 2018 12:49:11 +0000 (15:49 +0300)]
btrfs: Remove fs_info from run_one_delayed_ref

It can be referenced from the passed transaction handle, since it's
always valid.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from insert_inline_extent_backref
Nikolay Borisov [Wed, 20 Jun 2018 12:49:10 +0000 (15:49 +0300)]
btrfs: Remove fs_info from insert_inline_extent_backref

It can be referenced from the passed transaction handle, since it's
always valid.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from exclude_super_stripes
Nikolay Borisov [Wed, 20 Jun 2018 12:49:09 +0000 (15:49 +0300)]
btrfs: Remove fs_info from exclude_super_stripes

It can be referenced from the passed block group.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from free_excluded_extents
Nikolay Borisov [Wed, 20 Jun 2018 12:49:08 +0000 (15:49 +0300)]
btrfs: Remove fs_info from free_excluded_extents

It can be referenced from the passed block group.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from check_system_chunk
Nikolay Borisov [Wed, 20 Jun 2018 12:49:07 +0000 (15:49 +0300)]
btrfs: Remove fs_info from check_system_chunk

It can be referenced from trans since the function is always called
within a transaction.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from btrfs_alloc_chunk
Nikolay Borisov [Wed, 20 Jun 2018 12:49:06 +0000 (15:49 +0300)]
btrfs: Remove fs_info from btrfs_alloc_chunk

It can be referenced from trans since the function is always called
within a transaction.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from do_chunk_alloc
Nikolay Borisov [Wed, 20 Jun 2018 12:49:05 +0000 (15:49 +0300)]
btrfs: Remove fs_info from do_chunk_alloc

This function is always called with a valid transaction handle from
where fs_info can be referenced. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from run_delayed_tree_ref
Nikolay Borisov [Wed, 20 Jun 2018 12:49:04 +0000 (15:49 +0300)]
btrfs: Remove fs_info from run_delayed_tree_ref

It can always be referneced from the passed transaction handle since
it's always valid. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
3 years agobtrfs: Remove fs_info from cleanup_ref_head
Nikolay Borisov [Wed, 20 Jun 2018 12:49:03 +0000 (15:49 +0300)]
btrfs: Remove fs_info from cleanup_ref_head

fs_info can be refenreced from the transaction handle, since it's always
valid. No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>