btrfs: simplify the no-bioc fast path condition in btrfs_map_block

nr_alloc_stripes can't be one if we are writing to a replacement device,
as it is incremented for that case right above. Remove th

btrfs: simplify the no-bioc fast path condition in btrfs_map_block

nr_alloc_stripes can't be one if we are writing to a replacement device,
as it is incremented for that case right above. Remove the duplicate
checks.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: make find_first_extent_bit() return a boolean

Currently find_first_extent_bit() returns a 0 if it found a range in the
given io tree and 1 if it didn't find any. There's no need to return any

btrfs: make find_first_extent_bit() return a boolean

Currently find_first_extent_bit() returns a 0 if it found a range in the
given io tree and 1 if it didn't find any. There's no need to return any
errors, so make the return value a boolean and invert the logic to make
more sense: return true if it found a range and false if it didn't find
any range.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: add comments for btrfs_map_block()

The function btrfs_map_block() is a critical part of the btrfs storage
layer, which handles mapping of logical ranges to physical ranges.

Thus it's better

btrfs: add comments for btrfs_map_block()

The function btrfs_map_block() is a critical part of the btrfs storage
layer, which handles mapping of logical ranges to physical ranges.

Thus it's better to have some basic explanation, especially on the
following points:

- Segment split by various boundaries
As a continuous logical range may be split into different segments,
due to various factors like zones and RAID0/5/6/10 boundaries.

- The meaning of @mirror_num

- The possible single stripe optimization

- One deprecated parameter @need_raid_map
Just explicitly mark it deprecated so we're aware of the problem.

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

show more ...

btrfs: fix BUG_ON condition in btrfs_cancel_balance

Pausing and canceling balance can race to interrupt balance lead to BUG_ON
panic in btrfs_cancel_balance. The BUG_ON condition in btrfs_cancel_bal

btrfs: fix BUG_ON condition in btrfs_cancel_balance

Pausing and canceling balance can race to interrupt balance lead to BUG_ON
panic in btrfs_cancel_balance. The BUG_ON condition in btrfs_cancel_balance
does not take this race scenario into account.

However, the race condition has no other side effects. We can fix that.

Reproducing it with panic trace like this:

kernel BUG at fs/btrfs/volumes.c:4618!
RIP: 0010:btrfs_cancel_balance+0x5cf/0x6a0
Call Trace:
<TASK>
? do_nanosleep+0x60/0x120
? hrtimer_nanosleep+0xb7/0x1a0
? sched_core_clone_cookie+0x70/0x70
btrfs_ioctl_balance_ctl+0x55/0x70
btrfs_ioctl+0xa46/0xd20
__x64_sys_ioctl+0x7d/0xa0
do_syscall_64+0x38/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Race scenario as follows:
> mutex_unlock(&fs_info->balance_mutex);
> --------------------
> .......issue pause and cancel req in another thread
> --------------------
> ret = __btrfs_balance(fs_info);
>
> mutex_lock(&fs_info->balance_mutex);
> if (ret == -ECANCELED && atomic_read(&fs_info->balance_pause_req)) {
> btrfs_info(fs_info, "balance: paused");
> btrfs_exclop_balance(fs_info, BTRFS_EXCLOP_BALANCE_PAUSED);
> }

CC: stable@vger.kernel.org # 4.19+
Signed-off-by: xiaoshoukui <xiaoshoukui@ruijie.com.cn>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

fs: drop the timespec64 argument from update_time

Now that all of the update_time operations are prepared for it, we can
drop the timespec64 argument from the update_time operation. Do that and
remo

fs: drop the timespec64 argument from update_time

Now that all of the update_time operations are prepared for it, we can
drop the timespec64 argument from the update_time operation. Do that and
remove it from some associated functions like inode_update_time and
inode_needs_update_time.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230807-mgctime-v7-8-d1dec143a704@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

show more ...

btrfs: be a bit more careful when setting mirror_num_ret in btrfs_map_block

The mirror_num_ret is allowed to be NULL, although it has to be set when
smap is set. Unfortunately that is not a well en

btrfs: be a bit more careful when setting mirror_num_ret in btrfs_map_block

The mirror_num_ret is allowed to be NULL, although it has to be set when
smap is set. Unfortunately that is not a well enough specifiable
invariant for static type checkers, so add a NULL check to make sure they
are fine.

Fixes: 03793cbbc80f ("btrfs: add fast path for single device io in __btrfs_map_block")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: fix race between balance and cancel/pause

Syzbot reported a panic that looks like this:

assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED, in fs/btrfs/ioctl.c:4

btrfs: fix race between balance and cancel/pause

Syzbot reported a panic that looks like this:

assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED, in fs/btrfs/ioctl.c:465
------------[ cut here ]------------
kernel BUG at fs/btrfs/messages.c:259!
RIP: 0010:btrfs_assertfail+0x2c/0x30 fs/btrfs/messages.c:259
Call Trace:
<TASK>
btrfs_exclop_balance fs/btrfs/ioctl.c:465 [inline]
btrfs_ioctl_balance fs/btrfs/ioctl.c:3564 [inline]
btrfs_ioctl+0x531e/0x5b30 fs/btrfs/ioctl.c:4632
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The reproducer is running a balance and a cancel or pause in parallel.
The way balance finishes is a bit wonky, if we were paused we need to
save the balance_ctl in the fs_info, but clear it otherwise and cleanup.
However we rely on the return values being specific errors, or having a
cancel request or no pause request. If balance completes and returns 0,
but we have a pause or cancel request we won't do the appropriate
cleanup, and then the next time we try to start a balance we'll trip
this ASSERT.

The error handling is just wrong here, we always want to clean up,
unless we got -ECANCELLED and we set the appropriate pause flag in the
exclusive op. With this patch the reproducer ran for an hour without
tripping, previously it would trip in less than a few minutes.

Reported-by: syzbot+c0f3acf145cb465426d5@syzkaller.appspotmail.com
CC: stable@vger.kernel.org # 6.1+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: fix remaining u32 overflows when left shifting stripe_nr

There was regression caused by a97699d1d610 ("btrfs: replace
map_lookup->stripe_len by BTRFS_STRIPE_LEN") and supposedly fixed by
a729

btrfs: fix remaining u32 overflows when left shifting stripe_nr

There was regression caused by a97699d1d610 ("btrfs: replace
map_lookup->stripe_len by BTRFS_STRIPE_LEN") and supposedly fixed by
a7299a18a179 ("btrfs: fix u32 overflows when left shifting stripe_nr").
To avoid code churn the fix was open coding the type casts but
unfortunately missed one which was still possible to hit [1].

The missing place was assignment of bioc->full_stripe_logical inside
btrfs_map_block().

Fix it by adding a helper that does the safe calculation of the offset
and use it everywhere even though it may not be strictly necessary due
to already using u64 types. This replaces all remaining
"<< BTRFS_STRIPE_LEN_SHIFT" calls.

[1] https://lore.kernel.org/linux-btrfs/20230622065438.86402-1-wqu@suse.com/

Fixes: a7299a18a179 ("btrfs: fix u32 overflows when left shifting stripe_nr")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: fix u32 overflows when left shifting stripe_nr

[BUG]
David reported an ASSERT() get triggered during fio load on 8 devices
with data/raid6 and metadata/raid1c3:

fio --rw=randrw --randrepea

btrfs: fix u32 overflows when left shifting stripe_nr

[BUG]
David reported an ASSERT() get triggered during fio load on 8 devices
with data/raid6 and metadata/raid1c3:

fio --rw=randrw --randrepeat=1 --size=3000m \
--bsrange=512b-64k --bs_unaligned \
--ioengine=libaio --fsync=1024 \
--name=job0 --name=job1 \

The ASSERT() is from rbio_add_bio() of raid56.c:

ASSERT(orig_logical >= full_stripe_start &&
orig_logical + orig_len <= full_stripe_start +
rbio->nr_data * BTRFS_STRIPE_LEN);

Which is checking if the target rbio is crossing the full stripe
boundary.

[100.789] assertion failed: orig_logical >= full_stripe_start && orig_logical + orig_len <= full_stripe_start + rbio->nr_data * BTRFS_STRIPE_LEN, in fs/btrfs/raid56.c:1622
[100.795] ------------[ cut here ]------------
[100.796] kernel BUG at fs/btrfs/raid56.c:1622!
[100.797] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[100.798] CPU: 1 PID: 100 Comm: kworker/u8:4 Not tainted 6.4.0-rc6-default+ #124
[100.799] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552-rebuilt.opensuse.org 04/01/2014
[100.802] Workqueue: writeback wb_workfn (flush-btrfs-1)
[100.803] RIP: 0010:rbio_add_bio+0x204/0x210 [btrfs]
[100.806] RSP: 0018:ffff888104a8f300 EFLAGS: 00010246
[100.808] RAX: 00000000000000a1 RBX: ffff8881075907e0 RCX: ffffed1020951e01
[100.809] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[100.811] RBP: 0000000141d20000 R08: 0000000000000001 R09: ffff888104a8f04f
[100.813] R10: ffffed1020951e09 R11: 0000000000000003 R12: ffff88810e87f400
[100.815] R13: 0000000041d20000 R14: 0000000144529000 R15: ffff888101524000
[100.817] FS: 0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000
[100.821] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[100.822] CR2: 000055d54e44c270 CR3: 000000010a9a1006 CR4: 00000000003706a0
[100.824] Call Trace:
[100.825] <TASK>
[100.825] ? die+0x32/0x80
[100.826] ? do_trap+0x12d/0x160
[100.827] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.827] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.829] ? do_error_trap+0x90/0x130
[100.830] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.831] ? handle_invalid_op+0x2c/0x30
[100.833] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.835] ? exc_invalid_op+0x29/0x40
[100.836] ? asm_exc_invalid_op+0x16/0x20
[100.837] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.837] raid56_parity_write+0x64/0x270 [btrfs]
[100.838] btrfs_submit_chunk+0x26e/0x800 [btrfs]
[100.840] ? btrfs_bio_init+0x80/0x80 [btrfs]
[100.841] ? release_pages+0x503/0x6d0
[100.842] ? folio_unlock+0x2f/0x60
[100.844] ? __folio_put+0x60/0x60
[100.845] ? btrfs_do_readpage+0xae0/0xae0 [btrfs]
[100.847] btrfs_submit_bio+0x21/0x60 [btrfs]
[100.847] submit_one_bio+0x6a/0xb0 [btrfs]
[100.849] extent_write_cache_pages+0x395/0x680 [btrfs]
[100.850] ? __extent_writepage+0x520/0x520 [btrfs]
[100.851] ? mark_usage+0x190/0x190
[100.852] extent_writepages+0xdb/0x130 [btrfs]
[100.853] ? extent_write_locked_range+0x480/0x480 [btrfs]
[100.854] ? mark_usage+0x190/0x190
[100.854] ? attach_extent_buffer_page+0x220/0x220 [btrfs]
[100.855] ? reacquire_held_locks+0x178/0x280
[100.856] ? writeback_sb_inodes+0x245/0x7f0
[100.857] do_writepages+0x102/0x2e0
[100.858] ? page_writeback_cpu_online+0x10/0x10
[100.859] ? __lock_release.isra.0+0x14a/0x4d0
[100.860] ? reacquire_held_locks+0x280/0x280
[100.861] ? __lock_acquired+0x1e9/0x3d0
[100.862] ? do_raw_spin_lock+0x1b0/0x1b0
[100.863] __writeback_single_inode+0x94/0x450
[100.864] writeback_sb_inodes+0x372/0x7f0
[100.864] ? lock_sync+0xd0/0xd0
[100.865] ? do_raw_spin_unlock+0x93/0xf0
[100.866] ? sync_inode_metadata+0xc0/0xc0
[100.867] ? rwsem_optimistic_spin+0x340/0x340
[100.868] __writeback_inodes_wb+0x70/0x130
[100.869] wb_writeback+0x2d1/0x530
[100.869] ? __writeback_inodes_wb+0x130/0x130
[100.870] ? lockdep_hardirqs_on_prepare.part.0+0xf1/0x1c0
[100.870] wb_do_writeback+0x3eb/0x480
[100.871] ? wb_writeback+0x530/0x530
[100.871] ? mark_lock_irq+0xcd0/0xcd0
[100.872] wb_workfn+0xe0/0x3f0<

[CAUSE]
Commit a97699d1d610 ("btrfs: replace map_lookup->stripe_len by
BTRFS_STRIPE_LEN") changes how we calculate the map length, to reduce
u64 division.

Function btrfs_max_io_len() is to get the length to the stripe boundary.

It calculates the full stripe start offset (inside the chunk) by the
following code:

*full_stripe_start =
rounddown(*stripe_nr, nr_data_stripes(map)) <<
BTRFS_STRIPE_LEN_SHIFT;

The calculation itself is fine, but the value returned by rounddown() is
dependent on both @stripe_nr (which is u32) and nr_data_stripes() (which
returned int).

Thus the result is also u32, then we do the left shift, which can
overflow u32.

If such overflow happens, @full_stripe_start will be a value way smaller
than @offset, causing later "full_stripe_len - (offset -
*full_stripe_start)" to underflow, thus make later length calculation to
have no stripe boundary limit, resulting a write bio to exceed stripe
boundary.

There are some other locations like this, with a u32 @stripe_nr got left
shift, which can lead to a similar overflow.

[FIX]
Fix all @stripe_nr with left shift with a type cast to u64 before the
left shift.

Those involved @stripe_nr or similar variables are recording the stripe
number inside the chunk, which is small enough to be contained by u32,
but their offset inside the chunk can not fit into u32.

Thus for those specific left shifts, a type cast to u64 is necessary so
this patch does not touch them and the code will be cleaned up in the
future to keep the fix minimal.

Reported-by: David Sterba <dsterba@suse.com>
Fixes: a97699d1d610 ("btrfs: replace map_lookup->stripe_len by BTRFS_STRIPE_LEN")
Tested-by: David Sterba <dsterba@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: update i_version in update_dev_time

When updating the ctime, we also want to update i_version.

This is just something I noticed by inspection. There is probably no way
to test this today unl

btrfs: update i_version in update_dev_time

When updating the ctime, we also want to update i_version.

This is just something I noticed by inspection. There is probably no way
to test this today unless you can somehow get to this inode via nfsd.
Still, I think it's the right thing to do for consistency's sake.

David Sterba's comment: I don't see anything wrong with setting the
iversion bit, however I also don't see where this would be useful.
Agreed with the consistency, otherwise the time is updated when device
super block is wiped or a device initialized, both are big events so
missing that due to lack of iversion update seems unlikely. I'll add it
to the queue, thanks.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
[ add comments ]
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: open code need_full_stripe conditions

need_full_stripe is just a somewhat complicated way to say
"op != BTRFS_MAP_READ". Just spell that explicit check out, which makes
a lot of the code cur

btrfs: open code need_full_stripe conditions

need_full_stripe is just a somewhat complicated way to say
"op != BTRFS_MAP_READ". Just spell that explicit check out, which makes
a lot of the code currently using the helper easier to understand.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: open code btrfs_map_sblock

btrfs_map_sblock just hard codes three arguments and calls
btrfs_map_sblock. Remove it as it doesn't provide any real value, but
makes following the btrfs_map_bloc

btrfs: open code btrfs_map_sblock

btrfs_map_sblock just hard codes three arguments and calls
btrfs_map_sblock. Remove it as it doesn't provide any real value, but
makes following the btrfs_map_block call chains harder.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: rename __btrfs_map_block to btrfs_map_block

Now that the old btrfs_map_block is gone, drop the leading underscores
from __btrfs_map_block.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by:

btrfs: rename __btrfs_map_block to btrfs_map_block

Now that the old btrfs_map_block is gone, drop the leading underscores
from __btrfs_map_block.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: remove unused btrfs_map_block

There are no users of btrfs_map_block left, so remove it.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Sig

btrfs: remove unused btrfs_map_block

There are no users of btrfs_map_block left, so remove it.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: remove unused BTRFS_MAP_DISCARD

BTRFS_MAP_DISCARD is never set, as REQ_OP_DISCARD is never passed to
btrfs_op() only only checked in two ASSERTS.

Remove it and let the catchall WARN_ON in bt

btrfs: remove unused BTRFS_MAP_DISCARD

BTRFS_MAP_DISCARD is never set, as REQ_OP_DISCARD is never passed to
btrfs_op() only only checked in two ASSERTS.

Remove it and let the catchall WARN_ON in btrfs_op() deal with accidental
REQ_OP_DISCARDs leaked into btrfs_op(). Last use was in a4012f06f188
("btrfs: split discard handling out of btrfs_map_block").

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: simplify how changed fsid and metadata_uuid is checked

We often check if the metadata_uuid is not the same as fsid, and then we
check if the given fsid matches the metadata_uuid. This patch r

btrfs: simplify how changed fsid and metadata_uuid is checked

We often check if the metadata_uuid is not the same as fsid, and then we
check if the given fsid matches the metadata_uuid. This patch refactors
this logic into function match_fsid_changed and utilize it.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: simplify fsid and metadata_uuid comparisons

Refactor the functions find_fsid() and find_fsid_with_metadata_uuid(),
as they currently share a common set of code to compare the fsid and
metadat

btrfs: simplify fsid and metadata_uuid comparisons

Refactor the functions find_fsid() and find_fsid_with_metadata_uuid(),
as they currently share a common set of code to compare the fsid and
metadata_uuid. Create a common helper function, match_fsid_fs_devices().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: merge calls to alloc_fs_devices in device_list_add

Simplify has_metadata_uuid checks - by localizing the has_metadata_uuid
checked within alloc_fs_devices()'s second argument, it improves the

btrfs: merge calls to alloc_fs_devices in device_list_add

Simplify has_metadata_uuid checks - by localizing the has_metadata_uuid
checked within alloc_fs_devices()'s second argument, it improves the
code readability.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: streamline fsid checks in alloc_fs_devices

We currently have redundant checks for the non-null value of fsid
simplify it.

And, no one is using alloc_fs_devices() with a NULL metadata_uuid
wh

btrfs: streamline fsid checks in alloc_fs_devices

We currently have redundant checks for the non-null value of fsid
simplify it.

And, no one is using alloc_fs_devices() with a NULL metadata_uuid
while fsid is not NULL, add an assert() to verify this condition.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

show more ...

btrfs: make btrfs_free_device() static

The function btrfs_free_device() is never used outside of volumes.c, so
make it static and remove its prototype declaration at volumes.h.

Reviewed-by: Qu Wenr

btrfs: make btrfs_free_device() static

The function btrfs_free_device() is never used outside of volumes.c, so
make it static and remove its prototype declaration at volumes.h.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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block: replace fmode_t with a block-specific type for block open flags

The only overlap between the block open flags mapped into the fmode_t and
other uses of fmode_t are FMODE_READ and FMODE_WRITE.

block: replace fmode_t with a block-specific type for block open flags

The only overlap between the block open flags mapped into the fmode_t and
other uses of fmode_t are FMODE_READ and FMODE_WRITE. Define a new
blk_mode_t instead for use in blkdev_get_by_{dev,path}, ->open and
->ioctl and stop abusing fmode_t.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jack Wang <jinpu.wang@ionos.com> [rnbd]
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20230608110258.189493-28-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: use the holder as indication for exclusive opens

The current interface for exclusive opens is rather confusing as it
requires both the FMODE_EXCL flag and a holder. Remove the need to pass
F

block: use the holder as indication for exclusive opens

The current interface for exclusive opens is rather confusing as it
requires both the FMODE_EXCL flag and a holder. Remove the need to pass
FMODE_EXCL and just key off the exclusive open off a non-NULL holder.

For blkdev_put this requires adding the holder argument, which provides
better debug checking that only the holder actually releases the hold,
but at the same time allows removing the now superfluous mode argument.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: David Sterba <dsterba@suse.com> [btrfs]
Acked-by: Jack Wang <jinpu.wang@ionos.com> [rnbd]
Link: https://lore.kernel.org/r/20230608110258.189493-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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btrfs: don't pass a holder for non-exclusive blkdev_get_by_path

Passing a holder to blkdev_get_by_path when FMODE_EXCL isn't set doesn't
make sense, so pass NULL instead and remove the holder argume

btrfs: don't pass a holder for non-exclusive blkdev_get_by_path

Passing a holder to blkdev_get_by_path when FMODE_EXCL isn't set doesn't
make sense, so pass NULL instead and remove the holder argument from the
call chains the only end up in non-FMODE_EXCL blkdev_get_by_path calls.

Exclusive mode for device scanning is not used since commit 50d281fc434c
("btrfs: scan device in non-exclusive mode")".

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Acked-by: David Sterba <dsterba@suse.com>
Link: https://lore.kernel.org/r/20230608110258.189493-15-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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block: introduce holder ops

Add a new blk_holder_ops structure, which is passed to blkdev_get_by_* and
installed in the block_device for exclusive claims. It will be used to
allow the block layer t

block: introduce holder ops

Add a new blk_holder_ops structure, which is passed to blkdev_get_by_* and
installed in the block_device for exclusive claims. It will be used to
allow the block layer to call back into the user of the block device for
thing like notification of a removed device or a device resize.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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btrfs: fix leak of source device allocation state after device replace

When a device replace finishes, the source device is freed by calling
btrfs_free_device() at btrfs_rm_dev_replace_free_srcdev()

btrfs: fix leak of source device allocation state after device replace

When a device replace finishes, the source device is freed by calling
btrfs_free_device() at btrfs_rm_dev_replace_free_srcdev(), but the
allocation state, tracked in the device's alloc_state io tree, is never
freed.

This is a regression recently introduced by commit f0bb5474cff0 ("btrfs:
remove redundant release of btrfs_device::alloc_state"), which removed a
call to extent_io_tree_release() from btrfs_free_device(), with the
rationale that btrfs_close_one_device() already releases the allocation
state from a device and btrfs_close_one_device() is always called before
a device is freed with btrfs_free_device(). However that is not true for
the device replace case, as btrfs_free_device() is called without any
previous call to btrfs_close_one_device().

The issue is trivial to reproduce, for example, by running test btrfs/027
from fstests:

$ ./check btrfs/027
$ rmmod btrfs
$ dmesg
(...)
[84519.395485] BTRFS info (device sdc): dev_replace from <missing disk> (devid 2) to /dev/sdg started
[84519.466224] BTRFS info (device sdc): dev_replace from <missing disk> (devid 2) to /dev/sdg finished
[84519.552251] BTRFS info (device sdc): scrub: started on devid 1
[84519.552277] BTRFS info (device sdc): scrub: started on devid 2
[84519.552332] BTRFS info (device sdc): scrub: started on devid 3
[84519.552705] BTRFS info (device sdc): scrub: started on devid 4
[84519.604261] BTRFS info (device sdc): scrub: finished on devid 4 with status: 0
[84519.609374] BTRFS info (device sdc): scrub: finished on devid 3 with status: 0
[84519.610818] BTRFS info (device sdc): scrub: finished on devid 1 with status: 0
[84519.610927] BTRFS info (device sdc): scrub: finished on devid 2 with status: 0
[84559.503795] BTRFS: state leak: start 1048576 end 1351614463 state 1 in tree 1 refs 1
[84559.506764] BTRFS: state leak: start 1048576 end 1347420159 state 1 in tree 1 refs 1
[84559.510294] BTRFS: state leak: start 1048576 end 1351614463 state 1 in tree 1 refs 1

So fix this by adding back the call to extent_io_tree_release() at
btrfs_free_device().

Fixes: f0bb5474cff0 ("btrfs: remove redundant release of btrfs_device::alloc_state")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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