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When activating the swap file we flush all delalloc and wait for ordered
extent completion, so that we don't miss any delalloc and extents before
we check that the file's extent layout is usable for a swap file and
activate the swap file. We are called with the inode's VFS lock acquired,
so we won't race with buffered and direct IO writes, however we can still
race with memory mapped writes since they don't acquire the inode's VFS
lock. The race window is between flushing all delalloc and locking the
whole file's extent range, since memory mapped writes lock an extent range
with the length of a page.
Fix this by acquiring the inode's mmap lock before we flush delalloc.
CC: stable@vger.kernel.org # 5.4+
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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When we call btrfs_read_folio() we get an unlocked folio, so it is possible
for a different thread to concurrently modify folio->mapping. We must
check that this hasn't happened once we do have the lock.
CC: stable@vger.kernel.org # 6.12+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
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When we call btrfs_read_folio() to bring a folio uptodate, we unlock the
folio. The result of that is that a different thread can modify the
mapping (like remove it with invalidate) before we call folio_lock().
This results in an invalid page and we need to try again.
In particular, if we are relocating concurrently with aborting a
transaction, this can result in a crash like the following:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP
CPU: 76 PID: 1411631 Comm: kworker/u322:5
Workqueue: events_unbound btrfs_reclaim_bgs_work
RIP: 0010:set_page_extent_mapped+0x20/0xb0
RSP: 0018:ffffc900516a7be8 EFLAGS: 00010246
RAX: ffffea009e851d08 RBX: ffffea009e0b1880 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc900516a7b90 RDI: ffffea009e0b1880
RBP: 0000000003573000 R08: 0000000000000001 R09: ffff88c07fd2f3f0
R10: 0000000000000000 R11: 0000194754b575be R12: 0000000003572000
R13: 0000000003572fff R14: 0000000000100cca R15: 0000000005582fff
FS: 0000000000000000(0000) GS:ffff88c07fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000407d00f002 CR4: 00000000007706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
? __die+0x78/0xc0
? page_fault_oops+0x2a8/0x3a0
? __switch_to+0x133/0x530
? wq_worker_running+0xa/0x40
? exc_page_fault+0x63/0x130
? asm_exc_page_fault+0x22/0x30
? set_page_extent_mapped+0x20/0xb0
relocate_file_extent_cluster+0x1a7/0x940
relocate_data_extent+0xaf/0x120
relocate_block_group+0x20f/0x480
btrfs_relocate_block_group+0x152/0x320
btrfs_relocate_chunk+0x3d/0x120
btrfs_reclaim_bgs_work+0x2ae/0x4e0
process_scheduled_works+0x184/0x370
worker_thread+0xc6/0x3e0
? blk_add_timer+0xb0/0xb0
kthread+0xae/0xe0
? flush_tlb_kernel_range+0x90/0x90
ret_from_fork+0x2f/0x40
? flush_tlb_kernel_range+0x90/0x90
ret_from_fork_asm+0x11/0x20
</TASK>
This occurs because cleanup_one_transaction() calls
destroy_delalloc_inodes() which calls invalidate_inode_pages2() which
takes the folio_lock before setting mapping to NULL. We fail to check
this, and subsequently call set_extent_mapping(), which assumes that
mapping != NULL (in fact it asserts that in debug mode)
Note that the "fixes" patch here is not the one that introduced the
race (the very first iteration of this code from 2009) but a more recent
change that made this particular crash happen in practice.
Fixes: e7f1326cc24e ("btrfs: set page extent mapped after read_folio in relocate_one_page")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
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When a COWing a tree block, at btrfs_cow_block(), and we have the
tracepoint trace_btrfs_cow_block() enabled and preemption is also enabled
(CONFIG_PREEMPT=y), we can trigger a use-after-free in the COWed extent
buffer while inside the tracepoint code. This is because in some paths
that call btrfs_cow_block(), such as btrfs_search_slot(), we are holding
the last reference on the extent buffer @buf so btrfs_force_cow_block()
drops the last reference on the @buf extent buffer when it calls
free_extent_buffer_stale(buf), which schedules the release of the extent
buffer with RCU. This means that if we are on a kernel with preemption,
the current task may be preempted before calling trace_btrfs_cow_block()
and the extent buffer already released by the time trace_btrfs_cow_block()
is called, resulting in a use-after-free.
Fix this by moving the trace_btrfs_cow_block() from btrfs_cow_block() to
btrfs_force_cow_block() before the COWed extent buffer is freed.
This also has a side effect of invoking the tracepoint in the tree defrag
code, at defrag.c:btrfs_realloc_node(), since btrfs_force_cow_block() is
called there, but this is fine and it was actually missing there.
Reported-by: syzbot+8517da8635307182c8a5@syzkaller.appspotmail.com
Link: https://lore.kernel.org/linux-btrfs/6759a9b9.050a0220.1ac542.000d.GAE@google.com/
CC: stable@vger.kernel.org # 5.4+
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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Fix a use-after-free in the I/O completion path for encoded reads by
using a completion instead of a wait_queue for synchronizing the
destruction of 'struct btrfs_encoded_read_private'.
Fixes: 1881fba89bd5 ("btrfs: add BTRFS_IOC_ENCODED_READ ioctl")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever::
- Revert one v6.13 fix at the author's request (to be done differently)
- Fix a minor problem with recent NFSv4.2 COPY enhancements
- Fix an NFSv4.0 callback bug introduced in the v6.13 merge window
* tag 'nfsd-6.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
nfsd: restore callback functionality for NFSv4.0
NFSD: fix management of pending async copies
nfsd: Revert "nfsd: release svc_expkey/svc_export with rcu_work"
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Since commit 43b62ce3ff0a ("block: move bio io prio to a new field"), macro
bio_set_prio() does nothing but set bio->bi_ioprio. All other places just
set bio->bi_ioprio directly, so replace bio_set_prio() remaining
callsites with setting bio->bi_ioprio directly and delete that macro.
Signed-off-by: John Garry <john.g.garry@oracle.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20241202111957.2311683-3-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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The last use of is_server_using_iface() was removed in 2022 by
commit aa45dadd34e4 ("cifs: change iface_list from array to sorted linked
list")
Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
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Previously, deferred file handles were reused only for read
operations, this commit extends to reusing deferred handles
for write operations. By reusing these handles we can reduce
the need for open/close operations over the wire.
Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
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It claims the issue is only relevant for shared descriptor tables which
is of no concern for POSIX (but then is POSIX of concern to anyone
today?), which I presume predates standarized threading.
The comment also mentions the following systems:
- OpenBSD installing a larval file -- they moved away from it, file is
installed late and EBUSY is returned on conflict
- FreeBSD returning EBADF -- reworked to install the file early like
OpenBSD used to do
- NetBSD "deadlocks in amusing ways" -- their solution looks
Solaris-inspired (not a compliment) and I would not be particularly
surprised if it indeed deadlocked, in amusing ways or otherwise
I don't believe mentioning any of these adds anything and the statement
about the issue not being POSIX-relevant is outdated.
dup2 description in POSIX still does not mention the problem.
Just shorten the comment and be done with it.
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20241205154743.1586584-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Fix grammar and spelling in the propagate_umount() function.
Signed-off-by: Zhu Jun <zhujun2@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20241204081218.12141-1-zhujun2@cmss.chinamobile.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Replace the hardcoded value `7` in `put_fc_log()` with `ARRAY_SIZE`.
This improves maintainability by ensuring the loop adapts to changes
in the buffer size.
Signed-off-by: Guo Weikang <guoweikang.kernel@gmail.com>
Link: https://lore.kernel.org/r/20241202081146.1031780-1-guoweikang.kernel@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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The fput() of file rcS might not have completed causing issues when
executing the file.
rcS is opened in do_populate_rootfs before executed. At the end of
do_populate_rootfs() flush_delayed_fput() is called. Now
do_populate_rootfs() assumes that all fput()s caused by
do_populate_rootfs() have completed.
But flush_delayed_fput() can only ensure that fput() on the current
delayed_fput_list has finished. Any file that has been removed from
delayed_fput_list asynchronously in the meantime might not have
completed causing the exec to fail.
do_populate_rootfs delayed_fput_list delayed_fput execve
fput() a
fput() a->b
fput() a->b->rcS
__fput(a)
fput() c
fput() c->d
__fput(b)
flush_delayed_fput
__fput(c)
__fput(d)
__fput(b)
__fput(b) execve(rcS)
Ensure that all delayed work is done by calling flush_delayed_work() in
flush_delayed_fput() explicitly.
Signed-off-by: Chen Lin <chen.lin5@zte.com.cn>
Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn>
Link: https://lore.kernel.org/r/20241023135850067m3w2R0UXESiVCYz_wdAoT@zte.com.cn
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: Yang Tao <yang.tao172@zte.com.cn>
Cc: Xu Xin <xu.xin16@zte.com.cn>
[brauner: rewrite commit message]
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Use proc_douintvec_minmax() instead of proc_dointvec_minmax() to handle
sysctl_nr_open, because its data type is unsigned int, not int.
Fixes: 9b80a184eaad ("fs/file: more unsigned file descriptors")
Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com>
Link: https://lore.kernel.org/r/20241124034636.325337-1-alexjlzheng@tencent.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20241120112037.822078-3-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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When utilized it dodges strlen() in vfs_readlink(), giving about 1.5%
speed up when issuing readlink on /initrd.img on ext4.
Filesystems opt in by calling inode_set_cached_link() when creating an
inode.
The size is stored in a new union utilizing the same space as i_devices,
thus avoiding growing the struct or taking up any more space.
Churn-wise the current readlink_copy() helper is patched to accept the
size instead of calculating it.
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20241120112037.822078-2-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Allow bind-mounting pidfds. Similar to nsfs let's allow bind-mounts for
pidfds. This allows pidfds to be safely recovered and checked for
process recycling.
Link: https://lore.kernel.org/r/20241219-work-pidfs-mount-v1-1-dbc56198b839@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"25 hotfixes. 16 are cc:stable. 19 are MM and 6 are non-MM.
The usual bunch of singletons and doubletons - please see the relevant
changelogs for details"
* tag 'mm-hotfixes-stable-2024-12-21-12-09' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (25 commits)
mm: huge_memory: handle strsep not finding delimiter
alloc_tag: fix set_codetag_empty() when !CONFIG_MEM_ALLOC_PROFILING_DEBUG
alloc_tag: fix module allocation tags populated area calculation
mm/codetag: clear tags before swap
mm/vmstat: fix a W=1 clang compiler warning
mm: convert partially_mapped set/clear operations to be atomic
nilfs2: fix buffer head leaks in calls to truncate_inode_pages()
vmalloc: fix accounting with i915
mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy()
fork: avoid inappropriate uprobe access to invalid mm
nilfs2: prevent use of deleted inode
zram: fix uninitialized ZRAM not releasing backing device
zram: refuse to use zero sized block device as backing device
mm: use clear_user_(high)page() for arch with special user folio handling
mm: introduce cpu_icache_is_aliasing() across all architectures
mm: add RCU annotation to pte_offset_map(_lock)
mm: correctly reference merged VMA
mm: use aligned address in copy_user_gigantic_page()
mm: use aligned address in clear_gigantic_page()
mm: shmem: fix ShmemHugePages at swapout
...
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Pull smb client fixes from Steve French:
- fix regression in display of write stats
- fix rmmod failure with network namespaces
- two minor cleanups
* tag '6.13-rc3-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb: fix bytes written value in /proc/fs/cifs/Stats
smb: client: fix TCP timers deadlock after rmmod
smb: client: Deduplicate "select NETFS_SUPPORT" in Kconfig
smb: use macros instead of constants for leasekey size and default cifsattrs value
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Pull NFS client fixes from Trond Myklebust:
- NFS/pnfs: Fix a live lock between recalled layouts and layoutget
- Fix a build warning about an undeclared symbol 'nfs_idmap_cache_timeout'
* tag 'nfs-for-6.13-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
fs/nfs: fix missing declaration of nfs_idmap_cache_timeout
NFS/pnfs: Fix a live lock between recalled layouts and layoutget
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Pull ceph fixes from Ilya Dryomov:
"A handful of important CephFS fixes from Max, Alex and myself: memory
corruption due to a buffer overrun, potential infinite loop and
several memory leaks on the error paths. All but one marked for
stable"
* tag 'ceph-for-6.13-rc4' of https://github.com/ceph/ceph-client:
ceph: allocate sparse_ext map only for sparse reads
ceph: fix memory leak in ceph_direct_read_write()
ceph: improve error handling and short/overflow-read logic in __ceph_sync_read()
ceph: validate snapdirname option length when mounting
ceph: give up on paths longer than PATH_MAX
ceph: fix memory leaks in __ceph_sync_read()
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Switch to generating a private list of interior nodes to delete, instead
of using the equivalence class in the global data structure.
This eliminates possible races with snapshot creation, and is much
cleaner - it'll let us delete a lot of janky code for calculating and
maintaining the equivalence classes.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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When deleting dead snapshots, we move keys from redundant interior
snapshot nodes to child nodes - unless there's already a key, in which
case the ancestor key is deleted.
Previously, we tracked via equiv_seen whether the child snapshot had a
key, but this was tricky w.r.t. transaction restarts, and not
transactionally safe w.r.t. updates in the child snapshot.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This breaks when the trigger is inserting updates for the same btree, as
the inode trigger now does.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Originally, we ran insert triggers before overwrite so that if an extent
was being moved (by fallocate insert/collapse range), the bucket sector
count wouldn't hit 0 partway through, and so we don't trigger state
changes caused by that too soon.
But this is better solved by just moving the data type change to the
alloc trigger itself, where it's already called.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Normally, whitouts (KEY_TYPE_whitout) are filtered from btree lookups,
since they exist only to represent deletions of keys in ancestor
snapshots - except, they should not be filtered in
BTREE_ITER_all_snapshots mode, so that e.g. snapshot deletion can clean
them up.
This means that that the key cache has to store whiteouts, and key cache
fills cannot filter them.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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In BTREE_ITER_all_snapshots mode, we're required to only return keys
where the snapshot field matches the iterator position -
BTREE_ITER_filter_snapshots requires pulling keys into the key cache
from ancestor snapshots, so we have to check for that.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Change to match bch2_btree_trans_peek_updates() calling convention.
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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Now handled in one place.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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check_inode_hash_info_matches_root()
Clang 18 and newer warns (or errors with CONFIG_WERROR=y):
fs/bcachefs/str_hash.c:164:2: error: label followed by a declaration is a C23 extension [-Werror,-Wc23-extensions]
164 | struct bch_inode_unpacked inode;
| ^
In Clang 17 and prior, this is an unconditional hard error:
fs/bcachefs/str_hash.c:164:2: error: expected expression
164 | struct bch_inode_unpacked inode;
| ^
fs/bcachefs/str_hash.c:165:30: error: use of undeclared identifier 'inode'
165 | ret = bch2_inode_unpack(k, &inode);
| ^
fs/bcachefs/str_hash.c:169:55: error: use of undeclared identifier 'inode'
169 | struct bch_hash_info hash2 = bch2_hash_info_init(c, &inode);
| ^
fs/bcachefs/str_hash.c:171:40: error: use of undeclared identifier 'inode'
171 | ret = repair_inode_hash_info(trans, &inode);
| ^
Add an empty statement between the label and the declaration to fix the
warning/error without disturbing the code too much.
Fixes: 2519d3b0d656 ("bcachefs: bch2_str_hash_check_key() now checks inode hash info")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202412092339.QB7hffGC-lkp@intel.com/
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
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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bch2_snapshot_equiv() is going away; convert users that just wanted to
know if the snapshot exists to something better
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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Versions of the same inode in different snapshots must have the same
hash info; this is critical for lookups to work correctly.
We're going to be running the str_hash checks online, at readdir or
xattr list time, so we now need str_hash_check_key() to check for inode
hash seed mismatches, since it won't be run right after check_inodes().
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Bkey validation checks that inodes are well-formed and unpack
successfully, so an unpack error should always indicate memory
corruption or some other kind of hardware bug - but these are still
errors we can recover from.
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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Since we added per-inode counters there's now far too many counters to
show in one shot - if we want this in the future, it'll have to be in
debugfs.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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We can't hold mark_lock while calling fsck_err() - that's a deadlock,
mark_lock is meant to be a leaf node lock.
It's also unnecessary for gc_bucket() and bucket_gen(); rcu suffices
since the bucket_gens array describes its size, and we can't race with
device removal or resize during gc/fsck since that takes state lock.
Reported-by: syzbot+38641fcbda1aaffefdd4@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This fixes a deadlock during journal replay when btree node read errors
kick off a ton of rewrites: we don't want them competing with journal
replay.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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nonempty transition
For each bucket we track when the bucket became nonempty and when it
became empty again: if we can ensure that there will be no journal
flushes in the range [nonempty, empty) (possibly because they occured at
the same journal sequence number), then it's safe to reuse the bucket
without waiting for a journal commit.
This is a major performance optimization for erasure coding, where
writes are initially replicated, but the extra replicas are quickly
dropped: if those buckets are reused and overwritten without issuing a
cache flush to the underlying device, then they only cost bus bandwidth.
But there's a tricky corner case when there's multiple empty -> nonempty
-> empty transitions in quick succession, i.e. when data is getting
overwritten immediately as it's being written.
If this happens and the previous empty transition hasn't been flushed,
we need to continue tracking the previous nonempty transition - not
start a new one.
Fixing this means we now need to track both the nonempty and empty
transitions in bch_alloc_v4.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Harder to screw up if we're explicit about the range, and more correct
as journal reservations can be outstanding on multiple journal entries
simultaneously.
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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This lets us print the exact location in the journal if it was found in
the journal, or correctly print if it was found in the superblock.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Fix an O(n^2) issue when we find many overlapping (overwritten) btree
nodes - especially when one node overwrites many smaller nodes.
This was discovered to be an issue with the bcachefs
merge_torture_flakey test - if we had a large btree that was then
emptied, the number of difficult overwrites can be unbounded.
Cc: Kuan-Wei Chiu <visitorckw@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Check open buckets and buckets waiting for journal commit before doing
other expensive lookups.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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tested repairing from a bug uncovered by the merge_torture_flakey test
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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