Share the calls to extent_clear_unlock_delalloc for btrfs_path allocation
failure handling and the normal exit path.
This relies on btrfs_free_path ignoring a NULL pointer, and the
initialization of cur_offset to start at the beginning of the function.
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Use the block group pointer used to track the outstanding NOCOW writes as
a boolean to remove the duplicate nocow variable, and keep it contained
in the main loop to simplify the logic.
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
When run_delalloc_nocow has cow_start set to a value other than (u64)-1,
it has delayed COW writeback pending behind cur_offset. When an error
occurs in such a window, the range going back to cow_start and not just
cur_offset needs to be unlocked, but only two error cases handle this
correctly Move the code to handle unlock the COW range to the common
error handling label and document the logic.
To make things even more complicated, cow_file_range as called by
fallback_to_cow will unlock the range it is operating on when it fails as
well, so we need to reset cow_start right after caling fallback_to_cow
instead of only when it succeeded.
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Use LIST_HEAD() to initialize the list_head instead of open-coding it.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
During mount we will call btrfs_orphan_cleanup() to remove any inodes that
were previously deleted (have a link count of 0) but for which we were not
able before to remove their items from the subvolume tree. The removal of
the items will happen by triggering eviction, when we do the final iput()
on them at btrfs_orphan_cleanup(), which will end in the loop at
btrfs_evict_inode() that truncates inode items.
In a dire situation we may have a transaction abort due to -ENOSPC when
attempting to truncate the inode items, and in that case the orphan item
(key type BTRFS_ORPHAN_ITEM_KEY) will remain in the subvolume tree and
when we hit the next iteration of the while loop at btrfs_orphan_cleanup()
we will find the same orphan item as before, and then we will return
-EINVAL from btrfs_orphan_cleanup() through the following if statement:
if (found_key.offset == last_objectid) {
btrfs_err(fs_info,
"Error removing orphan entry, stopping orphan cleanup");
ret = -EINVAL;
goto out;
}
This makes the mount operation fail with -EINVAL, when it should have been
-ENOSPC. This is confusing because -EINVAL might lead a user into thinking
it provided invalid mount options for example.
An example where this happens:
$ mount test.img /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.
$ dmesg
[ 2542.356934] BTRFS: device fsid 977fff75-1181-4d2b-a739-384fa710d16e devid 1 transid 47409973 /dev/loop0 scanned by mount (4459)
[ 2542.357451] BTRFS info (device loop0): using crc32c (crc32c-intel) checksum algorithm
[ 2542.357461] BTRFS info (device loop0): disk space caching is enabled
[ 2542.742287] BTRFS info (device loop0): auto enabling async discard
[ 2542.764554] BTRFS info (device loop0): checking UUID tree
[ 2551.743065] ------------[ cut here ]------------
[ 2551.743068] BTRFS: Transaction aborted (error -28)
[ 2551.743149] WARNING: CPU: 7 PID: 215 at fs/btrfs/block-group.c:3494 btrfs_write_dirty_block_groups+0x397/0x3d0 [btrfs]
[ 2551.743311] Modules linked in: btrfs blake2b_generic (...)
[ 2551.743353] CPU: 7 PID: 215 Comm: kworker/u24:5 Not tainted 6.4.0-rc6-btrfs-next-134+ #1
[ 2551.743356] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
[ 2551.743357] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs]
[ 2551.743405] RIP: 0010:btrfs_write_dirty_block_groups+0x397/0x3d0 [btrfs]
[ 2551.743449] Code: 8b 43 0c (...)
[ 2551.743451] RSP: 0018:ffff982c005a7c40 EFLAGS: 00010286
[ 2551.743452] RAX: 0000000000000000 RBX: ffff88fc6e44b400 RCX: 0000000000000000
[ 2551.743453] RDX: 0000000000000002 RSI: ffffffff8dff0878 RDI: 00000000ffffffff
[ 2551.743454] RBP: ffff88fc51817208 R08: 0000000000000000 R09: ffff982c005a7ae0
[ 2551.743455] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88fc43d2e570
[ 2551.743456] R13: ffff88fc43d2e400 R14: ffff88fc8fb08ee0 R15: ffff88fc6e44b530
[ 2551.743457] FS: 0000000000000000(0000) GS:ffff89035fbc0000(0000) knlGS:0000000000000000
[ 2551.743458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2551.743459] CR2: 00007fa8cdf2f6f4 CR3: 0000000124850003 CR4: 0000000000370ee0
[ 2551.743462] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2551.743463] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2551.743464] Call Trace:
[ 2551.743472] <TASK>
[ 2551.743474] ? __warn+0x80/0x130
[ 2551.743478] ? btrfs_write_dirty_block_groups+0x397/0x3d0 [btrfs]
[ 2551.743520] ? report_bug+0x1f4/0x200
[ 2551.743523] ? handle_bug+0x42/0x70
[ 2551.743526] ? exc_invalid_op+0x14/0x70
[ 2551.743528] ? asm_exc_invalid_op+0x16/0x20
[ 2551.743532] ? btrfs_write_dirty_block_groups+0x397/0x3d0 [btrfs]
[ 2551.743574] ? _raw_spin_unlock+0x15/0x30
[ 2551.743576] ? btrfs_run_delayed_refs+0x1bd/0x200 [btrfs]
[ 2551.743609] commit_cowonly_roots+0x1e9/0x260 [btrfs]
[ 2551.743652] btrfs_commit_transaction+0x42e/0xfa0 [btrfs]
[ 2551.743693] ? __pfx_autoremove_wake_function+0x10/0x10
[ 2551.743697] flush_space+0xf1/0x5d0 [btrfs]
[ 2551.743743] ? _raw_spin_unlock+0x15/0x30
[ 2551.743745] ? finish_task_switch+0x91/0x2a0
[ 2551.743748] ? _raw_spin_unlock+0x15/0x30
[ 2551.743750] ? btrfs_get_alloc_profile+0xc9/0x1f0 [btrfs]
[ 2551.743793] btrfs_async_reclaim_metadata_space+0xe1/0x230 [btrfs]
[ 2551.743837] process_one_work+0x1d9/0x3e0
[ 2551.743844] worker_thread+0x4a/0x3b0
[ 2551.743847] ? __pfx_worker_thread+0x10/0x10
[ 2551.743849] kthread+0xee/0x120
[ 2551.743852] ? __pfx_kthread+0x10/0x10
[ 2551.743854] ret_from_fork+0x29/0x50
[ 2551.743860] </TASK>
[ 2551.743861] ---[ end trace 0000000000000000 ]---
[ 2551.743863] BTRFS info (device loop0: state A): dumping space info:
[ 2551.743866] BTRFS info (device loop0: state A): space_info DATA has 126976 free, is full
[ 2551.743868] BTRFS info (device loop0: state A): space_info total=13458472960, used=13458137088, pinned=143360, reserved=0, may_use=0, readonly=65536 zone_unusable=0
[ 2551.743870] BTRFS info (device loop0: state A): space_info METADATA has -51625984 free, is full
[ 2551.743872] BTRFS info (device loop0: state A): space_info total=771751936, used=770146304, pinned=1605632, reserved=0, may_use=51625984, readonly=0 zone_unusable=0
[ 2551.743874] BTRFS info (device loop0: state A): space_info SYSTEM has 14663680 free, is not full
[ 2551.743875] BTRFS info (device loop0: state A): space_info total=14680064, used=16384, pinned=0, reserved=0, may_use=0, readonly=0 zone_unusable=0
[ 2551.743877] BTRFS info (device loop0: state A): global_block_rsv: size 53231616 reserved 51544064
[ 2551.743878] BTRFS info (device loop0: state A): trans_block_rsv: size 0 reserved 0
[ 2551.743879] BTRFS info (device loop0: state A): chunk_block_rsv: size 0 reserved 0
[ 2551.743880] BTRFS info (device loop0: state A): delayed_block_rsv: size 0 reserved 0
[ 2551.743881] BTRFS info (device loop0: state A): delayed_refs_rsv: size 786432 reserved 0
[ 2551.743886] BTRFS: error (device loop0: state A) in btrfs_write_dirty_block_groups:3494: errno=-28 No space left
[ 2551.743911] BTRFS info (device loop0: state EA): forced readonly
[ 2551.743951] BTRFS warning (device loop0: state EA): could not allocate space for delete; will truncate on mount
[ 2551.743962] BTRFS error (device loop0: state EA): Error removing orphan entry, stopping orphan cleanup
[ 2551.743973] BTRFS warning (device loop0: state EA): Skipping commit of aborted transaction.
[ 2551.743989] BTRFS error (device loop0: state EA): could not do orphan cleanup -22
So make the btrfs_orphan_cleanup() return the value of BTRFS_FS_ERROR(),
if it's set, and -EINVAL otherwise.
For that same example, after this change, the mount operation fails with
-ENOSPC:
$ mount test.img /mnt
mount: /mnt: mount(2) system call failed: No space left on device.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
For zoned file systems we need to use run_delalloc_zoned to submit
writeback, as we need to write out partial allocations when running into
zone active limits.
submit_uncompressed_range currently always calls cow_file_range to
allocate blocks and thus misses the active zone limits handling. Fix
this by passing the pages_dirty argument to run_delalloc_zoned and always
using it from submit_uncompressed_range as it does the right thing for
zoned and non-zoned file systems.
To account for the fact that run_delalloc_zoned is now also used for
non-zoned file systems rename it to run_delalloc_cow, and add comment
describing it.
Fixes: 42c0110009 ("btrfs: zoned: introduce dedicated data write path for zoned filesystems")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
extent_write_locked_range currently expects that either all or no
pages are dirty when it is called. Bur run_delalloc_zoned is called
directly in the writepages path, and has the dirty bit cleared only
for locked_page and which the extent_write_cache_pages currently
operates. It currently works around this by redirtying locked_page,
but that is a bit inefficient and cumbersome. Pass a locked_page
argument to run_delalloc_zoned so that clearing the dirty bit can
be skipped on just that page.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Handling of the done_offset to cow_file_range is a bit confusing, as
it is not updated at all when the function succeeds, and the -EAGAIN
status is used bother for the case where we need to wait for a zone
finish and the one where the allocation was partially successful.
Change the calling convention so that done_offset is always updated,
and 0 is returned if some allocation was successful (partial allocation
can still only happen for zoned devices), and waiting for a zone
finish is done internally in cow_file_range instead of the caller.
Also write a comment explaining the logic.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
compress_file_range needs to clear the dirty bit before handing off work
to the compression worker threads to prevent processes coming in through
mmap and changing the file contents while the compression is accessing
the data (See commit 4adaa61102 ("Btrfs: fix race between mmap writes
and compression").
But when compress_file_range decides to not compress the data, it falls
back to submit_uncompressed_range which uses extent_write_locked_range
to write the uncompressed data. extent_write_locked_range currently
expects all pages to be marked dirty so that it can clear the dirty
bit itself, and thus compress_file_range has to redirty the page range.
Redirtying the page range is rather inefficient and also pointless,
so instead pass a pages_dirty parameter to extent_write_locked_range
and skip the redirty game entirely.
Note that compress_file_range was even redirtying the locked_page twice
given that extent_range_clear_dirty_for_io already redirties all pages
in the range, which must include locked_page if there is one.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
compress_file_range has two code blocks to free the page array for the
compressed data. Share the code using a goto label.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
compress_file_range can fail to compress either because of resource or
alignment constraints or because the data is incompressible. In the latter
case the inode is marked so that compression isn't tried again. Currently
that check is based on the condition that the pages array has been allocated
which is rather cryptic. Use a separate label to clearly distinguish this
case.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Currently the logic whether to compress or not in compress_file_range is
a bit convoluted because it tries to share code for creating inline
extents for the compressible [1] path and the bail to uncompressed path.
But the latter isn't needed at all, because cow_file_range as called by
submit_uncompressed_range will already create inline extents as needed,
so there is no need to have special handling for it if we can live with
the fact that it will be called a bit later in the ->ordered_func of the
workqueue instead of right now.
[1] there is undocumented logic that creates an uncompressed inline
extent outside of the shall not compress logic if total_in is too small.
This logic isn't explained in comments or any commit log I could find,
so I've preserved it. Documentation explaining it would be appreciated
if anyone understands this code.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Reorder compress_file_range so that the main compression flow happens
straight line and not in branches. To do this ensure that pages is
always zeroed before a page allocation happens, which allows the
cleanup_and_bail_uncompressed label to clean up the page allocations
as needed.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The code in submit_compressed_extents just loops over the async_extents,
and doesn't need to be conditional on an inode being present, as there
won't be any async_extent in the list if we created and inline extent.
Merge the two functions to simplify the logic.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
There is no good reason to have the simple async_cow_start wrapper,
merge the argument conversion into the main compress_file_range function.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Now that the ->inode check isn't needed in submit_compressed_extents
any more, there is no reason to clear the field early. Always keep
the inode around until the work item is finished and remove the special
casing, and the counting of compressed extents in compress_file_range.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Instead of checking for a NULL !pages and explaining this with a cryptic
comment, just check the compression type for BTRFS_COMPRESS_NONE to make
the check self-explanatory.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Instead of a separate page_started argument that tells the callers that
btrfs_run_delalloc_range already started writeback by itself, overload
the return value with a positive 1 in additio to 0 and a negative error
code to indicate that is has already started writeback, and remove the
nr_written argument as that caller can calculate it directly based on
the range, and in fact already does so for the case where writeback
wasn't started yet.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The return value from submit_uncompressed_range is ignored, and that's
fine because the error reporting happens through the mapping and
ordered_extent.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Move the printk that is supposed to help to debug failures in
submit_one_async_extent into submit_one_async_extent and make it
coniditonal on actually having an error condition instead of spamming
the log unconditionally.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
end_extent_writepage is a small helper that combines a call to
btrfs_mark_ordered_io_finished with conditional error-only calls to
btrfs_page_clear_uptodate and mapping_set_error with a somewhat
unfortunate calling convention that passes and inclusive end instead
of the len expected by the underlying functions.
Remove end_extent_writepage and open code it in the 4 callers. Out
of those two already are error-only and thus don't need the extra
conditional, and one already has the mapping_set_error, so a duplicate
call can be avoided.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
btrfs_writepage_endio_finish_ordered is a small wrapper around
btrfs_mark_ordered_io_finished that just changs the argument passing
slightly, and adds a tracepoint.
Move the tracpoint to btrfs_mark_ordered_io_finished, which means
it now also covers the error handling in btrfs_cleanup_ordered_extent
and switch all callers to just call btrfs_mark_ordered_io_finished
directly.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
For NOCOW files, run_delalloc_nocow can still fall back to COW
allocations when required and calls to fallback_to_cow helper for
that. For such an allocation we can have multiple ordered_extents
for existing extents that NOCOW overwrites and new allocations that
fallback_to_cow creates. If one of the new extents is an inline
extent, the writepages could would have to avoid normal page writeback
for them as indicated by the page_started return argument, which
run_delalloc_nocow can't return. Fix this by never creating inline
extents from fallback_to_cow.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
The int used as bool unlock is not a very good way to describe the
behavior, and the next patch will have to add another behavior modifier.
We'll do that by two bool parameters instead of adding bit flags. Now
specifies that the pages should always be kept locked. This is the
inverse of the old unlock argument.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
[ switch flags to bool ]
Signed-off-by: David Sterba <dsterba@suse.com>
If we do a write whose bio suffers an error, we will never reclaim the
qgroup reserved space for it. We allocate the space in the write_iter
codepath, then release the reservation as we allocate the ordered
extent, but we only create a delayed ref if the ordered extent finishes.
If it has an error, we simply leak the rsv. This is apparent in running
any error injecting (dmerror) fstests like btrfs/146 or btrfs/160. Such
tests fail due to dmesg on umount complaining about the leaked qgroup
data space.
When we clean up other aspects of space on failed ordered_extents, also
free the qgroup rsv.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
CC: stable@vger.kernel.org # 5.10+
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
While performing compressed writes, if the extent reservation fails, the
async extent pages are first freed in the error check for return value
ret, and then again at out_free label.
Remove the first call to free_async_extent_pages().
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The readdir implementation currently processes always up to the last index
it finds. This however can result in an infinite loop if the directory has
a large number of entries such that they won't all fit in the given buffer
passed to the readdir callback, that is, dir_emit() returns a non-zero
value. Because in that case readdir() will be called again and if in the
meanwhile new directory entries were added and we still can't put all the
remaining entries in the buffer, we keep repeating this over and over.
The following C program and test script reproduce the problem:
$ cat /mnt/readdir_prog.c
#include <sys/types.h>
#include <dirent.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
DIR *dir = opendir(".");
struct dirent *dd;
while ((dd = readdir(dir))) {
printf("%s\n", dd->d_name);
rename(dd->d_name, "TEMPFILE");
rename("TEMPFILE", dd->d_name);
}
closedir(dir);
}
$ gcc -o /mnt/readdir_prog /mnt/readdir_prog.c
$ cat test.sh
#!/bin/bash
DEV=/dev/sdi
MNT=/mnt/sdi
mkfs.btrfs -f $DEV &> /dev/null
#mkfs.xfs -f $DEV &> /dev/null
#mkfs.ext4 -F $DEV &> /dev/null
mount $DEV $MNT
mkdir $MNT/testdir
for ((i = 1; i <= 2000; i++)); do
echo -n > $MNT/testdir/file_$i
done
cd $MNT/testdir
/mnt/readdir_prog
cd /mnt
umount $MNT
This behaviour is surprising to applications and it's unlike ext4, xfs,
tmpfs, vfat and other filesystems, which always finish. In this case where
new entries were added due to renames, some file names may be reported
more than once, but this varies according to each filesystem - for example
ext4 never reported the same file more than once while xfs reports the
first 13 file names twice.
So change our readdir implementation to track the last index number when
opendir() is called and then make readdir() never process beyond that
index number. This gives the same behaviour as ext4.
Reported-by: Rob Landley <rob@landley.net>
Link: https://lore.kernel.org/linux-btrfs/2c8c55ec-04c6-e0dc-9c5c-8c7924778c35@landley.net/
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217681
CC: stable@vger.kernel.org # 6.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When the call to btrfs_reloc_clone_csums in cow_file_range returns an
error, we jump to the out_unlock label with the extent_reserved variable
set to false. The cleanup at the label will then call
extent_clear_unlock_delalloc on the range from start to end. But we've
already added cur_alloc_size to start before the jump, so there might no
range be left from the newly incremented start to end. Move the check for
'start < end' so that it is reached by also for the !extent_reserved case.
CC: stable@vger.kernel.org # 6.1+
Fixes: a315e68f6e ("Btrfs: fix invalid attempt to free reserved space on failure to cow range")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When the call to btrfs_extract_ordered_extent in btrfs_dio_submit_io
fails to allocate memory for a new ordered_extent, it calls into the
btrfs_dio_end_io for error handling. btrfs_dio_end_io then assumes that
bbio->ordered is set because it is supposed to be at this point, except
for this error handling corner case. Try to not overload the
btrfs_dio_end_io with error handling of a bio in a non-canonical state,
and instead call btrfs_finish_ordered_extent and iomap_dio_bio_end_io
directly for this error case.
Reported-by: syzbot <syzbot+5b82f0e951f8c2bcdb8f@syzkaller.appspotmail.com>
Fixes: b41b6f6937 ("btrfs: use btrfs_finish_ordered_extent to complete direct writes")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: syzbot <syzbot+5b82f0e951f8c2bcdb8f@syzkaller.appspotmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
While trying to get the subpage blocksize tests running, I hit the
following panic on generic/476
assertion failed: PagePrivate(page) && page->private, in fs/btrfs/subpage.c:229
kernel BUG at fs/btrfs/subpage.c:229!
Internal error: Oops - BUG: 00000000f2000800 [#1] SMP
CPU: 1 PID: 1453 Comm: fsstress Not tainted 6.4.0-rc7+ #12
Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20230301gitf80f052277c8-26.fc38 03/01/2023
pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : btrfs_subpage_assert+0xbc/0xf0
lr : btrfs_subpage_assert+0xbc/0xf0
Call trace:
btrfs_subpage_assert+0xbc/0xf0
btrfs_subpage_clear_checked+0x38/0xc0
btrfs_page_clear_checked+0x48/0x98
btrfs_truncate_block+0x5d0/0x6a8
btrfs_cont_expand+0x5c/0x528
btrfs_write_check.isra.0+0xf8/0x150
btrfs_buffered_write+0xb4/0x760
btrfs_do_write_iter+0x2f8/0x4b0
btrfs_file_write_iter+0x1c/0x30
do_iter_readv_writev+0xc8/0x158
do_iter_write+0x9c/0x210
vfs_iter_write+0x24/0x40
iter_file_splice_write+0x224/0x390
direct_splice_actor+0x38/0x68
splice_direct_to_actor+0x12c/0x260
do_splice_direct+0x90/0xe8
generic_copy_file_range+0x50/0x90
vfs_copy_file_range+0x29c/0x470
__arm64_sys_copy_file_range+0xcc/0x498
invoke_syscall.constprop.0+0x80/0xd8
do_el0_svc+0x6c/0x168
el0_svc+0x50/0x1b0
el0t_64_sync_handler+0x114/0x120
el0t_64_sync+0x194/0x198
This happens because during btrfs_cont_expand we'll get a page, set it
as mapped, and if it's not Uptodate we'll read it. However between the
read and re-locking the page we could have called release_folio() on the
page, but left the page in the file mapping. release_folio() can clear
the page private, and thus further down we blow up when we go to modify
the subpage bits.
Fix this by putting the set_page_extent_mapped() after the read. This
is safe because read_folio() will call set_page_extent_mapped() before
it does the read, and then if we clear page private but leave it on the
mapping we're completely safe re-setting set_page_extent_mapped(). With
this patch I can now run generic/476 without panicing.
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Running delayed iputs, which never happens in an irq context, needs to
lock the spinlock fs_info->delayed_iput_lock. When finishing bios for
data writes (irq context, bio.c) we call btrfs_put_ordered_extent() which
needs to add a delayed iput and for that it needs to acquire the spinlock
fs_info->delayed_iput_lock. Without disabling irqs when running delayed
iputs we can therefore deadlock on that spinlock. The same deadlock can
also happen when adding an inode to the delayed iputs list, since this
can be done outside an irq context as well.
Syzbot recently reported this, which results in the following trace:
================================
WARNING: inconsistent lock state
6.4.0-syzkaller-09904-ga507db1d8fdc #0 Not tainted
--------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
btrfs-cleaner/16079 [HC0[0]:SC0[0]:HE1:SE1] takes:
ffff888107804d20 (&fs_info->delayed_iput_lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]
ffff888107804d20 (&fs_info->delayed_iput_lock){+.?.}-{2:2}, at: btrfs_run_delayed_iputs+0x28/0xe0 fs/btrfs/inode.c:3523
{IN-SOFTIRQ-W} state was registered at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:350 [inline]
btrfs_add_delayed_iput+0x128/0x390 fs/btrfs/inode.c:3490
btrfs_put_ordered_extent fs/btrfs/ordered-data.c:559 [inline]
btrfs_put_ordered_extent+0x2f6/0x610 fs/btrfs/ordered-data.c:547
__btrfs_bio_end_io fs/btrfs/bio.c:118 [inline]
__btrfs_bio_end_io+0x136/0x180 fs/btrfs/bio.c:112
btrfs_orig_bbio_end_io+0x86/0x2b0 fs/btrfs/bio.c:163
btrfs_simple_end_io+0x105/0x380 fs/btrfs/bio.c:378
bio_endio+0x589/0x690 block/bio.c:1617
req_bio_endio block/blk-mq.c:766 [inline]
blk_update_request+0x5c5/0x1620 block/blk-mq.c:911
blk_mq_end_request+0x59/0x680 block/blk-mq.c:1032
lo_complete_rq+0x1c6/0x280 drivers/block/loop.c:370
blk_complete_reqs+0xb3/0xf0 block/blk-mq.c:1110
__do_softirq+0x1d4/0x905 kernel/softirq.c:553
run_ksoftirqd kernel/softirq.c:921 [inline]
run_ksoftirqd+0x31/0x60 kernel/softirq.c:913
smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
irq event stamp: 39
hardirqs last enabled at (39): [<ffffffff81d5ebc4>] __do_kmem_cache_free mm/slab.c:3558 [inline]
hardirqs last enabled at (39): [<ffffffff81d5ebc4>] kmem_cache_free mm/slab.c:3582 [inline]
hardirqs last enabled at (39): [<ffffffff81d5ebc4>] kmem_cache_free+0x244/0x370 mm/slab.c:3575
hardirqs last disabled at (38): [<ffffffff81d5eb5e>] __do_kmem_cache_free mm/slab.c:3553 [inline]
hardirqs last disabled at (38): [<ffffffff81d5eb5e>] kmem_cache_free mm/slab.c:3582 [inline]
hardirqs last disabled at (38): [<ffffffff81d5eb5e>] kmem_cache_free+0x1de/0x370 mm/slab.c:3575
softirqs last enabled at (0): [<ffffffff814ac99f>] copy_process+0x227f/0x75c0 kernel/fork.c:2448
softirqs last disabled at (0): [<0000000000000000>] 0x0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&fs_info->delayed_iput_lock);
<Interrupt>
lock(&fs_info->delayed_iput_lock);
*** DEADLOCK ***
1 lock held by btrfs-cleaner/16079:
#0: ffff888107804860 (&fs_info->cleaner_mutex){+.+.}-{3:3}, at: cleaner_kthread+0x103/0x4b0 fs/btrfs/disk-io.c:1463
stack backtrace:
CPU: 3 PID: 16079 Comm: btrfs-cleaner Not tainted 6.4.0-syzkaller-09904-ga507db1d8fdc #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_usage_bug kernel/locking/lockdep.c:3978 [inline]
valid_state kernel/locking/lockdep.c:4020 [inline]
mark_lock_irq kernel/locking/lockdep.c:4223 [inline]
mark_lock.part.0+0x1102/0x1960 kernel/locking/lockdep.c:4685
mark_lock kernel/locking/lockdep.c:4649 [inline]
mark_usage kernel/locking/lockdep.c:4598 [inline]
__lock_acquire+0x8e4/0x5e20 kernel/locking/lockdep.c:5098
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:350 [inline]
btrfs_run_delayed_iputs+0x28/0xe0 fs/btrfs/inode.c:3523
cleaner_kthread+0x2e5/0x4b0 fs/btrfs/disk-io.c:1478
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
So fix this by using spin_lock_irq() and spin_unlock_irq() when running
delayed iputs, and using spin_lock_irqsave() and spin_unlock_irqrestore()
when adding a delayed iput().
Reported-by: syzbot+da501a04be5ff533b102@syzkaller.appspotmail.com
Fixes: ec63b84d46 ("btrfs: add an ordered_extent pointer to struct btrfs_bio")
Link: https://lore.kernel.org/linux-btrfs/000000000000d5c89a05ffbd39dd@google.com/
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
At btrfs_orphan_cleanup(), if we can't find an inode (btrfs_iget() returns
an -ENOENT error pointer), we proceed with 'ret' set to -ENOENT and the
inode pointer set to ERR_PTR(-ENOENT). Later when we proceed to the body
of the following if statement:
if (ret == -ENOENT || inode->i_nlink) {
(...)
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
iput(inode);
goto out;
}
(...)
ret = btrfs_del_orphan_item(trans, root,
found_key.objectid);
btrfs_end_transaction(trans);
if (ret) {
iput(inode);
goto out;
}
continue;
}
If we get an error from btrfs_start_transaction() or from the call to
btrfs_del_orphan_item() we end calling iput() against an inode pointer
that has a value of ERR_PTR(-ENOENT), resulting in a crash with the
following trace:
[876.667] BUG: kernel NULL pointer dereference, address: 0000000000000096
[876.667] #PF: supervisor read access in kernel mode
[876.667] #PF: error_code(0x0000) - not-present page
[876.667] PGD 0 P4D 0
[876.668] Oops: 0000 [#1] PREEMPT SMP PTI
[876.668] CPU: 0 PID: 2356187 Comm: mount Tainted: G W 6.4.0-rc6-btrfs-next-134+ #1
[876.668] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
[876.668] RIP: 0010:iput+0xa/0x20
[876.668] Code: ff ff ff 66 (...)
[876.669] RSP: 0018:ffffafa9c0c9f9d0 EFLAGS: 00010282
[876.669] RAX: ffffffffffffffe4 RBX: 000000000009453b RCX: 0000000000000000
[876.669] RDX: 0000000000000001 RSI: ffffafa9c0c9f930 RDI: fffffffffffffffe
[876.669] RBP: ffff95c612f3b800 R08: 0000000000000001 R09: ffffffffffffffe4
[876.670] R10: 00018f2a71010000 R11: 000000000ead96e3 R12: ffff95cb7d6909a0
[876.670] R13: fffffffffffffffe R14: ffff95c60f477000 R15: 00000000ffffffe4
[876.670] FS: 00007f5fbe30a840(0000) GS:ffff95ccdfa00000(0000) knlGS:0000000000000000
[876.670] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[876.671] CR2: 0000000000000096 CR3: 000000055e9f6004 CR4: 0000000000370ef0
[876.671] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[876.671] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[876.672] Call Trace:
[876.744] <TASK>
[876.744] ? __die_body+0x1b/0x60
[876.744] ? page_fault_oops+0x15d/0x450
[876.745] ? __kmem_cache_alloc_node+0x47/0x410
[876.745] ? do_user_addr_fault+0x65/0x8a0
[876.745] ? exc_page_fault+0x74/0x170
[876.746] ? asm_exc_page_fault+0x22/0x30
[876.746] ? iput+0xa/0x20
[876.746] btrfs_orphan_cleanup+0x221/0x330 [btrfs]
[876.746] btrfs_lookup_dentry+0x58f/0x5f0 [btrfs]
[876.747] btrfs_lookup+0xe/0x30 [btrfs]
[876.747] __lookup_slow+0x82/0x130
[876.785] walk_component+0xe5/0x160
[876.786] path_lookupat.isra.0+0x6e/0x150
[876.786] filename_lookup+0xcf/0x1a0
[876.786] ? mod_objcg_state+0xd2/0x360
[876.786] ? obj_cgroup_charge+0xf5/0x110
[876.787] ? should_failslab+0xa/0x20
[876.787] ? kmem_cache_alloc+0x47/0x450
[876.787] vfs_path_lookup+0x51/0x90
[876.788] mount_subtree+0x8d/0x130
[876.788] btrfs_mount+0x149/0x410 [btrfs]
[876.788] ? __kmem_cache_alloc_node+0x47/0x410
[876.788] ? vfs_parse_fs_param+0xc0/0x110
[876.789] legacy_get_tree+0x24/0x50
[876.834] vfs_get_tree+0x22/0xd0
[876.852] path_mount+0x2d8/0x9c0
[876.852] do_mount+0x79/0x90
[876.852] __x64_sys_mount+0x8e/0xd0
[876.853] do_syscall_64+0x38/0x90
[876.899] entry_SYSCALL_64_after_hwframe+0x72/0xdc
[876.958] RIP: 0033:0x7f5fbe50b76a
[876.959] Code: 48 8b 0d a9 (...)
[876.959] RSP: 002b:00007fff01925798 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[876.959] RAX: ffffffffffffffda RBX: 00007f5fbe694264 RCX: 00007f5fbe50b76a
[876.960] RDX: 0000561bde6c8720 RSI: 0000561bde6bdec0 RDI: 0000561bde6c31a0
[876.960] RBP: 0000561bde6bdc70 R08: 0000000000000000 R09: 0000000000000001
[876.960] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[876.960] R13: 0000561bde6c31a0 R14: 0000561bde6c8720 R15: 0000561bde6bdc70
[876.960] </TASK>
So fix this by setting 'inode' to NULL whenever we get an error from
btrfs_iget(), and to make the code simpler, stop testing for 'ret' being
-ENOENT to check if we have an inode - instead test for 'inode' being NULL
or not. Having a NULL 'inode' prevents any iput() call from crashing, as
iput() ignores NULL inode pointers. Also, stop testing for a NULL return
value from btrfs_iget() with PTR_ERR_OR_ZERO(), because btrfs_iget() never
returns NULL - in case an inode is not found, it returns ERR_PTR(-ENOENT),
and in case of memory allocation failure, it returns ERR_PTR(-ENOMEM).
We also don't need the extra iput() calls on the error branches for the
btrfs_start_transaction() and btrfs_del_orphan_item() calls, as we have
already called iput() before, so remove them.
Fixes: a13bb2c038 ("btrfs: add missing iputs on orphan cleanup failure")
CC: stable@vger.kernel.org # 6.4
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
At btrfs_orphan_cleanup(), if we were able to find the inode, we do an
iput() on the inode, then if btrfs_drop_verity_items() succeeds and then
either btrfs_start_transaction() or btrfs_del_orphan_item() fail, we do
another iput() in the respective error paths, resulting in an extra iput()
on the inode.
Fix this by setting inode to NULL after the first iput(), as iput()
ignores a NULL inode pointer argument.
Fixes: a13bb2c038 ("btrfs: add missing iputs on orphan cleanup failure")
CC: stable@vger.kernel.org # 6.4
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
During truncation we reserve 2 metadata units when starting a transaction
(reserved space goes to fs_info->trans_block_rsv) and then attempt to
migrate 1 unit (min_size bytes) from fs_info->trans_block_rsv into the
local block reserve. If we ever fail we trigger a BUG_ON(), which should
never happen, because we reserved 2 units. However if we happen to fail
for some reason, we don't need to be so dire and hit a BUG_ON(), we can
just error out the truncation and, since this is highly unexpected,
surround the error check with WARN_ON(), to get an informative stack
trace and tag the branh as 'unlikely'. Also make the 'min_size' variable
const, since it's not supposed to ever change and any accidental change
could possibly make the space migration not so unlikely to fail.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Since commit a2ad63daa8 ("VFS: add FMODE_CAN_ODIRECT file flag") file
systems can just set the FMODE_CAN_ODIRECT flag at open time instead of
wiring up a dummy direct_IO method to indicate support for direct I/O.
Do that for btrfs so that noop_direct_IO can eventually be removed.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Use the btrfs_finish_ordered_extent helper to complete compressed writes
using the bbio->ordered pointer instead of requiring an rbtree lookup
in the otherwise equivalent btrfs_mark_ordered_io_finished called from
btrfs_writepage_endio_finish_ordered.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Add a pointer to the ordered_extent to the existing union in struct
btrfs_bio, so all code dealing with data write bios can just use a
pointer dereference to retrieve the ordered_extent instead of doing
multiple rbtree lookups per I/O.
The reference to this ordered_extent is dropped at end I/O time,
which implies that an extra one must be acquired when the bio is split.
This also requires moving the btrfs_extract_ordered_extent call into
btrfs_split_bio so that the invariant of always having a valid
ordered_extent reference for the btrfs_bio is kept.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
btrfs_dio_submit_io is the only place that uses btrfs_bio_end_io to end a
bio that hasn't been submitted using btrfs_submit_bio yet, and this
invariant will become a problem with upcoming changes to the btrfs bio
layer. Just open code the assignment of bi_status and the call to
btrfs_dio_end_io.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
btrfs_submit_compressed_write always operates on a single ordered_extent.
Make that explicit by using btrfs_alloc_ordered_extent in the callers
and passing the ordered_extent to btrfs_submit_compressed_write. This
will help with storing and ordered_extent pointer in the btrfs_bio in
subsequent patches.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Both callers of btrfs_reloc_clone_csums allocate the ordered_extent that
btrfs_reloc_clone_csums operates on. Switch them to use
btrfs_alloc_ordered_extent instead of btrfs_add_ordered_extent and
pass the ordered_extent to btrfs_reloc_clone_csums instead of doing an
extra lookup.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Refactor run_delalloc_nocow a little bit so that there is only a single
call to btrfs_add_ordered_extent instead of two.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When extent_write_locked_range was originally added, it was only used
writing back compressed pages from an async helper thread. But it is
now also used for writing back pages on zoned devices, where it is
called directly from the ->writepage context. In this case we want to
be able to pass on the writeback_control instead of creating a new one,
and more importantly want to use all the normal cgroup interaction
instead of potentially deferring writeback to another helper.
Fixes: 898793d992 ("btrfs: zoned: write out partially allocated region")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Now that the btrfs writeback code has stopped using PageError, using
PAGE_SET_ERROR to just set the per-address_space error flag is confusing.
Open code the mapping_set_error calls in the callers and remove
the PAGE_SET_ERROR flag.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
PageError is not used by the VFS/MM and deprecated because it uses up a
page bit and has no coherent rules. Instead read errors are usually
propagated by not setting or clearing the uptodate bit, and write errors
are propagated through the address_space. Btrfs now only sets the flag
and never clears it for data pages, so just remove all places setting it,
and the subpage error bit.
Note that the error propagation for superblock writes that work on the
block device mapping still uses PageError for now, but that will be
addressed in a separate series.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
cow_file_range_async is only used for compressed writeback. Rename it
to run_delalloc_compressed, which also fits in with run_delalloc_nocow
and run_delalloc_zoned.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
If cow_file_range_async fails to allocate the asynchronous writeback
context, it currently returns an error and entirely fails the writeback.
This is not a good idea as a writeback failure is a non-temporary error
condition that will make the file system unusable. Just fall back to
synchronous uncompressed writeback instead. This requires us to delay
setting the BTRFS_INODE_HAS_ASYNC_EXTENT flag until we've committed to
the async writeback.
The compression checks INODE_NOCOMPRESS and FORCE_COMPRESS are moved
from cow_file_range_async to the preceding checks btrfs_run_delalloc_range().
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
split_extent_map splits off the first chunk of an extent map into a new
one. One of the two users is the zoned I/O completion code that wants to
rewrite the logical block start address right after this split. Pass in
the logical address to be set in the split off first extent_map as an
argument to avoid an extra extent tree lookup for this case.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
The btrfs zoned completion code currently needs an ordered_extent and
extent_map per bio so that it can account for the non-predictable
write location from Zone Append. To archive that it currently splits
the ordered_extent and extent_map at I/O submission time, and then
records the actual physical address in the ->physical field of the
ordered_extent.
This patch instead switches to record the "original" physical address
that the btrfs allocator assigned in spare space in the btrfs_bio,
and then rewrites the logical address in the btrfs_ordered_sum
structure at I/O completion time. This allows the ordered extent
completion handler to simply walk the list of ordered csums and
split the ordered extent as needed. This removes an extra ordered
extent and extent_map lookup and manipulation during the I/O
submission path, and instead batches it in the I/O completion path
where we need to touch these anyway.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Return the ordered_extent split from the passed in one. This will be
needed to be able to store an ordered_extent in the btrfs_bio.
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.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>
There is no good reason for doing one before the other in terms of
failure implications, but doing the extent_map split first will
simplify some upcoming refactoring.
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.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>
