Age | Commit message (Collapse) | Author | Files | Lines |
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Since our poll handling is edge triggered, multishot handlers retry
internally until they know that no more data is available. In
preparation for limiting these retries, add an internal return code,
IOU_REQUEUE, which can be used to inform the poll backend about the
handler wanting to retry, but that this should happen through a normal
task_work requeue rather than keep hammering on the issue side for this
one request.
No functional changes in this patch, nobody is using this return code
just yet.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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In preparation for putting some retry logic in there, have the done
path just skip straight to the end rather than have too much nesting
in here.
No functional changes in this patch.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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In preparation for calling __io_poll_execute() higher up, move the
functions to avoid forward declarations.
No functional changes in this patch.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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io_read_mshot() always relies on poll triggering retries, and this works
fine as long as we do a retry per size of the buffer being read. The
buffer size is given by the size of the buffer(s) in the given buffer
group ID.
But if we're reading less than what is available, then we don't always
get to read everything that is available. For example, if the buffers
available are 32 bytes and we have 64 bytes to read, then we'll
correctly read the first 32 bytes and then wait for another poll trigger
before we attempt the next read. This next poll trigger may never
happen, in which case we just sit forever and never make progress, or it
may trigger at some point in the future, and now we're just delivering
the available data much later than we should have.
io_read_mshot() could do retries itself, but that is wasteful as we'll
be going through all of __io_read() again, and most likely in vain.
Rather than do that, bump our poll reference count and have
io_poll_check_events() do one more loop and check with vfs_poll() if we
have more data to read. If we do, io_read_mshot() will get invoked again
directly and we'll read the next chunk.
io_poll_multishot_retry() must only get called from inside
io_poll_issue(), which is our multishot retry handler, as we know we
already "own" the request at this point.
Cc: stable@vger.kernel.org
Link: https://github.com/axboe/liburing/issues/1041
Fixes: fc68fcda0491 ("io_uring/rw: add support for IORING_OP_READ_MULTISHOT")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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We need to correct some aspects of the IORING_OP_FIXED_FD_INSTALL
command to take into account the security implications of making an
io_uring-private file descriptor generally accessible to a userspace
task.
The first change in this patch is to enable auditing of the FD_INSTALL
operation as installing a file descriptor into a task's file descriptor
table is a security relevant operation and something that admins/users
may want to audit.
The second change is to disable the io_uring credential override
functionality, also known as io_uring "personalities", in the
FD_INSTALL command. The credential override in FD_INSTALL is
particularly problematic as it affects the credentials used in the
security_file_receive() LSM hook. If a task were to request a
credential override via REQ_F_CREDS on a FD_INSTALL operation, the LSM
would incorrectly check to see if the overridden credentials of the
io_uring were able to "receive" the file as opposed to the task's
credentials. After discussions upstream, it's difficult to imagine a
use case where we would want to allow a credential override on a
FD_INSTALL operation so we are simply going to block REQ_F_CREDS on
IORING_OP_FIXED_FD_INSTALL operations.
Fixes: dc18b89ab113 ("io_uring/openclose: add support for IORING_OP_FIXED_FD_INSTALL")
Signed-off-by: Paul Moore <paul@paul-moore.com>
Link: https://lore.kernel.org/r/20240123215501.289566-2-paul@paul-moore.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Pull more bcachefs updates from Kent Overstreet:
"Some fixes, Some refactoring, some minor features:
- Assorted prep work for disk space accounting rewrite
- BTREE_TRIGGER_ATOMIC: after combining our trigger callbacks, this
makes our trigger context more explicit
- A few fixes to avoid excessive transaction restarts on
multithreaded workloads: fstests (in addition to ktest tests) are
now checking slowpath counters, and that's shaking out a few bugs
- Assorted tracepoint improvements
- Starting to break up bcachefs_format.h and move on disk types so
they're with the code they belong to; this will make room to start
documenting the on disk format better.
- A few minor fixes"
* tag 'bcachefs-2024-01-21' of https://evilpiepirate.org/git/bcachefs: (46 commits)
bcachefs: Improve inode_to_text()
bcachefs: logged_ops_format.h
bcachefs: reflink_format.h
bcachefs; extents_format.h
bcachefs: ec_format.h
bcachefs: subvolume_format.h
bcachefs: snapshot_format.h
bcachefs: alloc_background_format.h
bcachefs: xattr_format.h
bcachefs: dirent_format.h
bcachefs: inode_format.h
bcachefs; quota_format.h
bcachefs: sb-counters_format.h
bcachefs: counters.c -> sb-counters.c
bcachefs: comment bch_subvolume
bcachefs: bch_snapshot::btime
bcachefs: add missing __GFP_NOWARN
bcachefs: opts->compression can now also be applied in the background
bcachefs: Prep work for variable size btree node buffers
bcachefs: grab s_umount only if snapshotting
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner:
"Updates for time and clocksources:
- A fix for the idle and iowait time accounting vs CPU hotplug.
The time is reset on CPU hotplug which makes the accumulated
systemwide time jump backwards.
- Assorted fixes and improvements for clocksource/event drivers"
* tag 'timers-core-2024-01-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
tick-sched: Fix idle and iowait sleeptime accounting vs CPU hotplug
clocksource/drivers/ep93xx: Fix error handling during probe
clocksource/drivers/cadence-ttc: Fix some kernel-doc warnings
clocksource/drivers/timer-ti-dm: Fix make W=n kerneldoc warnings
clocksource/timer-riscv: Add riscv_clock_shutdown callback
dt-bindings: timer: Add StarFive JH8100 clint
dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs
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git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Aneesh Kumar:
- Increase default stack size to 32KB for Book3S
Thanks to Michael Ellerman.
* tag 'powerpc-6.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/64s: Increase default stack size to 32KB
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Add line breaks - inode_to_text() is now much easier to read.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bcachefs_format.h has gotten too big; let's do some organizing.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Add a field to bch_snapshot for creation time; this will be important
when we start exposing the snapshot tree to userspace.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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The "apply this compression method in the background" paths now use the
compression option if background_compression is not set; this means that
setting or changing the compression option will cause existing data to
be compressed accordingly in the background.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bcachefs btree nodes are big - typically 256k - and btree roots are
pinned in memory. As we're now up to 18 btrees, we now have significant
memory overhead in mostly empty btree roots.
And in the future we're going to start enforcing that certain btree node
boundaries exist, to solve lock contention issues - analagous to XFS's
AGIs.
Thus, we need to start allocating smaller btree node buffers when we
can. This patch changes code that refers to the filesystem constant
c->opts.btree_node_size to refer to the btree node buffer size -
btree_buf_bytes() - where appropriate.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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When I was testing mongodb over bcachefs with compression,
there is a lockdep warning when snapshotting mongodb data volume.
$ cat test.sh
prog=bcachefs
$prog subvolume create /mnt/data
$prog subvolume create /mnt/data/snapshots
while true;do
$prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)
sleep 1s
done
$ cat /etc/mongodb.conf
systemLog:
destination: file
logAppend: true
path: /mnt/data/mongod.log
storage:
dbPath: /mnt/data/
lockdep reports:
[ 3437.452330] ======================================================
[ 3437.452750] WARNING: possible circular locking dependency detected
[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E
[ 3437.453562] ------------------------------------------------------
[ 3437.453981] bcachefs/35533 is trying to acquire lock:
[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190
[ 3437.454875]
but task is already holding lock:
[ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]
[ 3437.456009]
which lock already depends on the new lock.
[ 3437.456553]
the existing dependency chain (in reverse order) is:
[ 3437.457054]
-> #3 (&type->s_umount_key#48){.+.+}-{3:3}:
[ 3437.457507] down_read+0x3e/0x170
[ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]
[ 3437.458206] __x64_sys_ioctl+0x93/0xd0
[ 3437.458498] do_syscall_64+0x42/0xf0
[ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 3437.459155]
-> #2 (&c->snapshot_create_lock){++++}-{3:3}:
[ 3437.459615] down_read+0x3e/0x170
[ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs]
[ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs]
[ 3437.460686] notify_change+0x1f1/0x4a0
[ 3437.461283] do_truncate+0x7f/0xd0
[ 3437.461555] path_openat+0xa57/0xce0
[ 3437.461836] do_filp_open+0xb4/0x160
[ 3437.462116] do_sys_openat2+0x91/0xc0
[ 3437.462402] __x64_sys_openat+0x53/0xa0
[ 3437.462701] do_syscall_64+0x42/0xf0
[ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 3437.463359]
-> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}:
[ 3437.463843] down_write+0x3b/0xc0
[ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs]
[ 3437.464493] vfs_write+0x21b/0x4c0
[ 3437.464653] ksys_write+0x69/0xf0
[ 3437.464839] do_syscall_64+0x42/0xf0
[ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 3437.465231]
-> #0 (sb_writers#10){.+.+}-{0:0}:
[ 3437.465471] __lock_acquire+0x1455/0x21b0
[ 3437.465656] lock_acquire+0xc6/0x2b0
[ 3437.465822] mnt_want_write+0x46/0x1a0
[ 3437.465996] filename_create+0x62/0x190
[ 3437.466175] user_path_create+0x2d/0x50
[ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]
[ 3437.466617] __x64_sys_ioctl+0x93/0xd0
[ 3437.466791] do_syscall_64+0x42/0xf0
[ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 3437.467180]
other info that might help us debug this:
[ 3437.469670] 2 locks held by bcachefs/35533:
other info that might help us debug this:
[ 3437.467507] Chain exists of:
sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48
[ 3437.467979] Possible unsafe locking scenario:
[ 3437.468223] CPU0 CPU1
[ 3437.468405] ---- ----
[ 3437.468585] rlock(&type->s_umount_key#48);
[ 3437.468758] lock(&c->snapshot_create_lock);
[ 3437.469030] lock(&type->s_umount_key#48);
[ 3437.469291] rlock(sb_writers#10);
[ 3437.469434]
*** DEADLOCK ***
[ 3437.469670] 2 locks held by bcachefs/35533:
[ 3437.469838] #0: ffffa0a02ce00a88 (&c->snapshot_create_lock){++++}-{3:3}, at: bch2_fs_file_ioctl+0x1e3/0xc90 [bcachefs]
[ 3437.470294] #1: ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]
[ 3437.470744]
stack backtrace:
[ 3437.470922] CPU: 7 PID: 35533 Comm: bcachefs Kdump: loaded Tainted: G E 6.7.0-rc7-custom+ #85
[ 3437.471313] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014
[ 3437.471694] Call Trace:
[ 3437.471795] <TASK>
[ 3437.471884] dump_stack_lvl+0x57/0x90
[ 3437.472035] check_noncircular+0x132/0x150
[ 3437.472202] __lock_acquire+0x1455/0x21b0
[ 3437.472369] lock_acquire+0xc6/0x2b0
[ 3437.472518] ? filename_create+0x62/0x190
[ 3437.472683] ? lock_is_held_type+0x97/0x110
[ 3437.472856] mnt_want_write+0x46/0x1a0
[ 3437.473025] ? filename_create+0x62/0x190
[ 3437.473204] filename_create+0x62/0x190
[ 3437.473380] user_path_create+0x2d/0x50
[ 3437.473555] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]
[ 3437.473819] ? lock_acquire+0xc6/0x2b0
[ 3437.474002] ? __fget_files+0x2a/0x190
[ 3437.474195] ? __fget_files+0xbc/0x190
[ 3437.474380] ? lock_release+0xc5/0x270
[ 3437.474567] ? __x64_sys_ioctl+0x93/0xd0
[ 3437.474764] ? __pfx_bch2_fs_file_ioctl+0x10/0x10 [bcachefs]
[ 3437.475090] __x64_sys_ioctl+0x93/0xd0
[ 3437.475277] do_syscall_64+0x42/0xf0
[ 3437.475454] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 3437.475691] RIP: 0033:0x7f2743c313af
======================================================
In __bch2_ioctl_subvolume_create(), we grab s_umount unconditionally
and unlock it at the end of the function. There is a comment
"why do we need this lock?" about the lock coming from
commit 42d237320e98 ("bcachefs: Snapshot creation, deletion")
The reason is that __bch2_ioctl_subvolume_create() calls
sync_inodes_sb() which enforce locked s_umount to writeback all dirty
nodes before doing snapshot works.
Fix it by read locking s_umount for snapshotting only and unlocking
s_umount after sync_inodes_sb().
Signed-off-by: Su Yue <glass.su@suse.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bch_fs::snapshots is allocated by kvzalloc in __snapshot_t_mut.
It should be freed by kvfree not kfree.
Or umount will triger:
[ 406.829178 ] BUG: unable to handle page fault for address: ffffe7b487148008
[ 406.830676 ] #PF: supervisor read access in kernel mode
[ 406.831643 ] #PF: error_code(0x0000) - not-present page
[ 406.832487 ] PGD 0 P4D 0
[ 406.832898 ] Oops: 0000 [#1] PREEMPT SMP PTI
[ 406.833512 ] CPU: 2 PID: 1754 Comm: umount Kdump: loaded Tainted: G OE 6.7.0-rc7-custom+ #90
[ 406.834746 ] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014
[ 406.835796 ] RIP: 0010:kfree+0x62/0x140
[ 406.836197 ] Code: 80 48 01 d8 0f 82 e9 00 00 00 48 c7 c2 00 00 00 80 48 2b 15 78 9f 1f 01 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 56 9f 1f 01 <48> 8b 50 08 48 89 c7 f6 c2 01 0f 85 b0 00 00 00 66 90 48 8b 07 f6
[ 406.837810 ] RSP: 0018:ffffb9d641607e48 EFLAGS: 00010286
[ 406.838213 ] RAX: ffffe7b487148000 RBX: ffffb9d645200000 RCX: ffffb9d641607dc4
[ 406.838738 ] RDX: 000065bb00000000 RSI: ffffffffc0d88b84 RDI: ffffb9d645200000
[ 406.839217 ] RBP: ffff9a4625d00068 R08: 0000000000000001 R09: 0000000000000001
[ 406.839650 ] R10: 0000000000000001 R11: 000000000000001f R12: ffff9a4625d4da80
[ 406.840055 ] R13: ffff9a4625d00000 R14: ffffffffc0e2eb20 R15: 0000000000000000
[ 406.840451 ] FS: 00007f0a264ffb80(0000) GS:ffff9a4e2d500000(0000) knlGS:0000000000000000
[ 406.840851 ] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 406.841125 ] CR2: ffffe7b487148008 CR3: 000000018c4d2000 CR4: 00000000000006f0
[ 406.841464 ] Call Trace:
[ 406.841583 ] <TASK>
[ 406.841682 ] ? __die+0x1f/0x70
[ 406.841828 ] ? page_fault_oops+0x159/0x470
[ 406.842014 ] ? fixup_exception+0x22/0x310
[ 406.842198 ] ? exc_page_fault+0x1ed/0x200
[ 406.842382 ] ? asm_exc_page_fault+0x22/0x30
[ 406.842574 ] ? bch2_fs_release+0x54/0x280 [bcachefs]
[ 406.842842 ] ? kfree+0x62/0x140
[ 406.842988 ] ? kfree+0x104/0x140
[ 406.843138 ] bch2_fs_release+0x54/0x280 [bcachefs]
[ 406.843390 ] kobject_put+0xb7/0x170
[ 406.843552 ] deactivate_locked_super+0x2f/0xa0
[ 406.843756 ] cleanup_mnt+0xba/0x150
[ 406.843917 ] task_work_run+0x59/0xa0
[ 406.844083 ] exit_to_user_mode_prepare+0x197/0x1a0
[ 406.844302 ] syscall_exit_to_user_mode+0x16/0x40
[ 406.844510 ] do_syscall_64+0x4e/0xf0
[ 406.844675 ] entry_SYSCALL_64_after_hwframe+0x6e/0x76
[ 406.844907 ] RIP: 0033:0x7f0a2664e4fb
Signed-off-by: Su Yue <glass.su@suse.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Fixes: 023f9ac9f70f bcachefs: Delete dio read alignment check
Reported-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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The variable tmp is being assigned a value but it isn't being
read afterwards. The assignment is redundant and so tmp can be
removed.
Cleans up clang scan build warning:
warning: Although the value stored to 'ret' is used in the enclosing
expression, the value is never actually read from 'ret'
[deadcode.DeadStores]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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drop_locks_do() should not be used in a fastpath without first trying
the do in nonblocking mode - the unlock and relock will cause excessive
transaction restarts and potentially livelocking with other threads that
are contending for the same locks.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Factor out bch2_journal_bufs_to_text(), and use it in the
journal_entry_full() tracepoint; when we can't get a journal reservation
we need to know the outstanding journal entry sizes to know if the
problem is due to excessive flushing.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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When issuing discards, we may need to flush the journal if there's too
many buckets that can't be discarded until a journal flush.
But the heuristic was bad; we should be comparing the number of buckets
that need to flushes against the number of free buckets, not the number
of buckets we saw.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Also print out the data_opts, so that we can see what specifically is
being done to an extent.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This fixes a bug with rebalance IOs getting stuck with reads completed,
but writes never being issued.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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It appears this was accidentally deleted at some point - also, do a bit
of cleanup.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Drop t he loop in bch2_kthread_io_clock_wait(): this allows the code
that uses it to be woken up for other reasons, and fixes a bug where
rebalance wouldn't wake up when a scan was requested.
This raises the possibility of spurious wakeups, but callers should
always be able to handle that reasonably well.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Some (buggy!) compilers have issues with this.
Fixes: https://github.com/koverstreet/bcachefs/issues/625
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Pull header fix from Kent Overstreet:
"Just one small fixup for the RT build"
* tag 'header_cleanup-2024-01-20' of https://evilpiepirate.org/git/bcachefs:
spinlock: Fix failing build for PREEMPT_RT
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We don't have to take locks in any particular ordering - we'll make
forward progress just fine - but if we try to stick to an ordering, it
can help to avoid excessive would_deadlock transaction restarts.
This tweaks the reflink path to take extents btree locks in the right
order.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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The disk space accounting rewrite is splitting out accounting for each
replicas set - those are moving to btree keys, instead of percpu
counters.
This breaks bch2_trans_fs_usage_apply() up, splitting out the part we
will still need.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Split out base filesystem usage into its own type; prep work for
breaking up bch2_trans_fs_usage_apply().
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bounds checking helper, since compression types are extensible
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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