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Currently the scand kthread acts like a garbage collection for expired
rsbs on toss list, to clean them up after a certain timeout. It triggers
every couple of seconds and iterates over the toss list while holding
ls_rsbtbl_lock for the whole hash bucket iteration.
To reduce the amount of time holding ls_rsbtbl_lock, we now handle the
disposal of expired rsbs using a per-lockspace timer that expires for the
earliest tossed rsb on the lockspace toss queue. This toss queue is
ordered according to the rsb res_toss_time with the earliest tossed rsb
as the first entry. The toss timer will only trylock() necessary locks,
since it is low priority garbage collection, and will rearm the timer
if trylock() fails. If the timer function does not find any expired
rsb's, it rearms the timer with the next earliest expired rsb.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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In the past we had problems when an rsb had a reference counter greater
than one while in the toss state. An rsb in the toss state is not
actively used for locking, and should not have any other references
apart from the single ref keeping it on the rsb hash. Shift to freeing
rsb's directly rather than using kref_put to free them, since the ref
counting is not meant to be used in this state. Add warnings if ref
counting is seen while an rsb is in the toss state.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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Replace our own hash table with the more advanced rhashtable
for keeping rsb structs.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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To prepare for using rhashtable, add two rsb lists for iterating
through rsb's in two uncommon cases where this is necesssary:
- when dumping rsb state from debugfs, now using seq_list.
- when looking at all rsb's during recovery.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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There are several places where lock processing can perform two hash table
lookups, first in the "keep" list, and if not found, in the "toss" list.
This patch introduces a new rsb state flag "RSB_TOSS" to represent the
difference between the state of being on keep vs toss list, so that the
two lists can be combined. This avoids cases of two lookups.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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Prepare to replace our own hash table with rhashtable by replacing
the per-bucket locks in our own hash table with a single lock.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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Increment the ls_count value while dlm_scand is processing a
lockspace so that release_lockspace()/remove_lockspace() will
wait for dlm_scand to finish.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
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Johan Hovold reported that removing the legacy ntfs driver broke boot
for him since his fstab uses the legacy ntfs driver to access firmware
from the original Windows partition.
Use ntfs3 as an alias for legacy ntfs if CONFIG_NTFS_FS is selected.
This is similar to how ext3 is treated.
Link: https://lore.kernel.org/r/Zf2zPf5TO5oYt3I3@hovoldconsulting.com
Link: https://lore.kernel.org/r/20240325-hinkriegen-zuziehen-d7e2c490427a@brauner
Fixes: 7ffa8f3d3023 ("fs: Remove NTFS classic")
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Johan Hovold <johan@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fixes from Chuck Lever:
- Fix a potential tracepoint crash
- Fix NFSv4 GETATTR on big-endian platforms
* tag 'nfsd-6.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
NFSD: fix endianness issue in nfsd4_encode_fattr4
SUNRPC: Fix rpcgss_context trace event acceptor field
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Pull yet more bcachefs fixes from Kent Overstreet:
"This gets recovery working again for the affected user I've been
working with, and I'm still waiting to hear back on other bug reports
but should fix it for everyone else who's been having issues with
recovery.
- Various recovery fixes:
- fixes for the btree_insert_entry being resized on path
allocation btree_path array recently became dynamically
resizable, and btree_insert_entry along with it; this was being
observed during journal replay, when write buffer btree updates
don't use the write buffer and instead use the normal btree
update path
- multiple fixes for deadlock in recovery when we need to do lots
of btree node merges; excessive merges were clocking up the
whole pipeline
- write buffer path now correctly does btree node merges when
needed
- fix failure to go RW when superblock indicates recovery passes
needed (i.e. to complete an unfinished upgrade)
- Various unsafety fixes - test case contributed by a user who had
two drives out of a six drive array write out a whole bunch of
garbage after power failure
- New (tiny) on disk format feature: since it appears the btree node
scan tool will be a more regular thing (crappy hardware, user
error) - this adds a 64 bit per-device bitmap of regions that have
ever had btree nodes.
- A path->should_be_locked fix, from a larger patch series tightening
up invariants and assertions around btree transaction and path
locking state.
This particular fix prevents us from keeping around btree_paths
that are no longer needed"
* tag 'bcachefs-2024-04-15' of https://evilpiepirate.org/git/bcachefs: (24 commits)
bcachefs: set_btree_iter_dontneed also clears should_be_locked
bcachefs: fix error path of __bch2_read_super()
bcachefs: Check for backpointer bucket_offset >= bucket size
bcachefs: bch_member.btree_allocated_bitmap
bcachefs: sysfs internal/trigger_journal_flush
bcachefs: Fix bch2_btree_node_fill() for !path
bcachefs: add safety checks in bch2_btree_node_fill()
bcachefs: Interior known are required to have known key types
bcachefs: add missing bounds check in __bch2_bkey_val_invalid()
bcachefs: Fix btree node merging on write buffer btrees
bcachefs: Disable merges from interior update path
bcachefs: Run merges at BCH_WATERMARK_btree
bcachefs: Fix missing write refs in fs fio paths
bcachefs: Fix deadlock in journal replay
bcachefs: Go rw if running any explicit recovery passes
bcachefs: Standardize helpers for printing enum strs with bounds checks
bcachefs: don't queue btree nodes for rewrites during scan
bcachefs: fix race in bch2_btree_node_evict()
bcachefs: fix unsafety in bch2_stripe_to_text()
bcachefs: fix unsafety in bch2_extent_ptr_to_text()
...
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This is part of a larger series cleaning up the semantics of
should_be_locked and adding assertions around it; if we don't need an
iterator/path anymore, it clearly doesn't need to be locked.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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In __bch2_read_super(), if kstrdup() fails, it needs to release memory
in sb->holder, fix to call bch2_free_super() in the error path.
Signed-off-by: Chao Yu <chao@kernel.org>
Reviewed-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This removes one indirect function call per folio, and adds type safety
by not casting through a void pointer.
Based on a patch by Matthew Wilcox.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240412061614.1511629-1-hch@lst.de
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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This commit adds kernel-doc style comments with complete parameter
descriptions for the function cuse_process_init_reply.
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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FUSE attempts to detect server support for statx by trying it once and
setting no_statx=1 if it fails with ENOSYS, but consider the following
scenario:
- Userspace (e.g. sh) calls stat() on a file
* succeeds
- Userspace (e.g. lsd) calls statx(BTIME) on the same file
- request_mask = STATX_BASIC_STATS | STATX_BTIME
- first pass: sync=true due to differing cache_mask
- statx fails and returns ENOSYS
- set no_statx and retry
- retry sets mask = STATX_BASIC_STATS
- now mask == cache_mask; sync=false (time_before: still valid)
- so we take the "else if (stat)" path
- "err" is still ENOSYS from the failed statx call
Fix this by zeroing "err" before retrying the failed call.
Fixes: d3045530bdd2 ("fuse: implement statx")
Cc: stable@vger.kernel.org # v6.6
Signed-off-by: Danny Lin <danny@orbstack.dev>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Parallel dio write takes a negative refcount of fi->iocachectr and so does
open of file in passthrough mode.
The refcount of passthrough mode is associated with attach/detach of a
fuse_backing object to fuse inode.
For parallel dio write, the backing file is irrelevant, so the call to
fuse_inode_uncached_io_start() passes a NULL fuse_backing object.
Passing a NULL fuse_backing will result in false -EBUSY error if the file
is already open in passthrough mode.
Allow taking negative fi->iocachectr refcount with NULL fuse_backing,
because it does not conflict with an already attached fuse_backing object.
Fixes: 4a90451bbc7f ("fuse: implement open in passthrough mode")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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There is a confusion with fuse_file_uncached_io_{start,end} interface.
These helpers do two things when called from passthrough open()/release():
1. Take/drop negative refcount of fi->iocachectr (inode uncached io mode)
2. State change ff->iomode IOM_NONE <-> IOM_UNCACHED (file uncached open)
The calls from parallel dio write path need to take a reference on
fi->iocachectr, but they should not be changing ff->iomode state, because
in this case, the fi->iocachectr reference does not stick around until file
release().
Factor out helpers fuse_inode_uncached_io_{start,end}, to be used from
parallel dio write path and rename fuse_file_*cached_io_{start,end} helpers
to fuse_file_*cached_io_{open,release} to clarify the difference.
Fixes: 205c1d802683 ("fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This adds a small (64 bit) per-device bitmap that tracks ranges that
have btree nodes, for accelerating btree node scan if it is ever needed.
- New helpers, bch2_dev_btree_bitmap_marked() and
bch2_dev_bitmap_mark(), for checking and updating the bitmap
- Interior btree update path updates the bitmaps when required
- The check_allocations pass has a new fsck_err check,
btree_bitmap_not_marked
- New on disk format version, mi_btree_mitmap, which indicates the new
bitmap is present
- Upgrade table lists the required recovery pass and expected fsck error
- Btree node scan uses the bitmap to skip ranges if we're on the new
version
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Add a sysfs knob for immediately flushing the entire journal.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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We shouldn't be doing the unlock/relock dance when we're not using a
path - this fixes an assertion pop when called from btree node scan.
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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For forwards compatibilyt, we allow bkeys of unknown type in leaf nodes;
we can simply ignore metadata we don't understand. Pointers to btree
nodes must always be of known types, howwever.
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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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull sysfs fix from Al Viro:
"Get rid of lockdep false positives around sysfs/overlayfs
syzbot has uncovered a class of lockdep false positives for setups
with sysfs being one of the backing layers in overlayfs. The root
cause is that of->mutex allocated when opening a sysfs file read-only
(which overlayfs might do) is confused with of->mutex of a file opened
writable (held in write to sysfs file, which overlayfs won't do).
Assigning them separate lockdep classes fixes that bunch and it's
obviously safe"
* tag 'pull-sysfs-annotation-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
kernfs: annotate different lockdep class for of->mutex of writable files
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The writable file /sys/power/resume may call vfs lookup helpers for
arbitrary paths and readonly files can be read by overlayfs from vfs
helpers when sysfs is a lower layer of overalyfs.
To avoid a lockdep warning of circular dependency between overlayfs
inode lock and kernfs of->mutex, use a different lockdep class for
writable and readonly kernfs files.
Reported-by: syzbot+9a5b0ced8b1bfb238b56@syzkaller.appspotmail.com
Fixes: 0fedefd4c4e3 ("kernfs: sysfs: support custom llseek method for sysfs entries")
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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The btree write buffer flush fastpath that avoids the main transaction
commit path had the unfortunate side effect of not doing btree node
merging.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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There's been a bug in the btree write buffer where it wasn't triggering
btree node merges - and leaving behind a bunch of nearly empty btree
nodes.
Then during journal replay, when updates to the backpointers btree
aren't using the btree write buffer (because we require synchronization
with journal replay), we end up doing those merges all at once.
Then if it's the interior update path running them, we deadlock because
those run with the highest watermark.
There's no real need for the interior update path to be doing btree node
merges; other code paths can handle that at lower watermarks.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This fixes a deadlock where the interior update path during journal
replay ends up doing a ton of merges on the backpointers btree, and
deadlocking.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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bch2_journal_flush_seq requires us to have a write ref
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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btree_key_can_insert_cached() should be checking the watermark -
BCH_TRANS_COMMIT_journal_replay really means nonblocking mode when
watermark < reclaim, it was being used incorrectly.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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This fixes a bug where we fail to start when upgrading/downgrading
because we forgot we needed to go rw.
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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many nodes found during scan will be old nodes, overwritten by newer
nodes
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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.to_text() functions need to work on key values that didn't pass .valid
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Need to check if we have a valid bucket before checking if ptr is stale
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 missing validation; fixes assertion pop in bkey unpack
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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The btree paths array is now dynamically resizable - and as well the
btree_insert_entries array, as it needs to be the same size.
The merge path (and interior update path) allocates new btree paths,
thus can trigger a resize; thus we need to not retain direct pointers
after invoking merge; similarly when running btree node triggers.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs
Pull zonefs fix from Damien Le Moal:
- Suppress a coccicheck warning using str_plural()
* tag 'zonefs-6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
zonefs: Use str_plural() to fix Coccinelle warning
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Pull smb client fixes from Steve French:
- fix for oops in cifs_get_fattr of deleted files
- fix for the remote open counter going negative in some directory
lease cases
- fix for mkfifo to instantiate dentry to avoid possible crash
- important fix to allow handling key rotation for mount and remount
(ie cases that are becoming more common when password that was used
for the mount will expire soon but will be replaced by new password)
* tag 'v6.9-rc3-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb3: fix broken reconnect when password changing on the server by allowing password rotation
smb: client: instantiate when creating SFU files
smb3: fix Open files on server counter going negative
smb: client: fix NULL ptr deref in cifs_mark_open_handles_for_deleted_file()
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"The definition of insanity is doing the same thing over and over
again and expecting different results”
We've tried to do this before, most recently with commit bb2314b47996
("fs: Allow unprivileged linkat(..., AT_EMPTY_PATH) aka flink") about a
decade ago.
But the effort goes back even further than that, eg this thread back
from 1998 that is so old that we don't even have it archived in lore:
https://lkml.org/lkml/1998/3/10/108
which also points out some of the reasons why it's dangerous.
Or, how about then in 2003:
https://lkml.org/lkml/2003/4/6/112
where we went through some of the same arguments, just wirh different
people involved.
In particular, having access to a file descriptor does not necessarily
mean that you have access to the path that was used for lookup, and
there may be very good reasons why you absolutely must not have access
to a path to said file.
For example, if we were passed a file descriptor from the outside into
some limited environment (think chroot, but also user namespaces etc) a
'flink()' system call could now make that file visible inside a context
where it's not supposed to be visible.
In the process the user may also be able to re-open it with permissions
that the original file descriptor did not have (eg a read-only file
descriptor may be associated with an underlying file that is writable).
Another variation on this is if somebody else (typically root) opens a
file in a directory that is not accessible to others, and passes the
file descriptor on as a read-only file. Again, the access to the file
descriptor does not imply that you should have access to a path to the
file in the filesystem.
So while we have tried this several times in the past, it never works.
The last time we did this, that commit bb2314b47996 quickly got reverted
again in commit f0cc6ffb8ce8 (Revert "fs: Allow unprivileged linkat(...,
AT_EMPTY_PATH) aka flink"), with a note saying "We may re-do this once
the whole discussion about the interface is done".
Well, the discussion is long done, and didn't come to any resolution.
There's no question that 'flink()' would be a useful operation, but it's
a dangerous one.
However, it does turn out that since 2008 (commit d76b0d9b2d87: "CRED:
Use creds in file structs") we have had a fairly straightforward way to
check whether the file descriptor was opened by the same credentials as
the credentials of the flink().
That allows the most common patterns that people want to use, which tend
to be to either open the source carefully (ie using the openat2()
RESOLVE_xyz flags, and/or checking ownership with fstat() before
linking), or to use O_TMPFILE and fill in the file contents before it's
exposed to the world with linkat().
But it also means that if the file descriptor was opened by somebody
else, or we've gone through a credentials change since, the operation no
longer works (unless we have CAP_DAC_READ_SEARCH capabilities in the
opener's user namespace, as before).
Note that the credential equality check is done by using pointer
equality, which means that it's not enough that you have effectively the
same user - they have to be literally identical, since our credentials
are using copy-on-write semantics.
So you can't change your credentials to something else and try to change
it back to the same ones between the open() and the linkat(). This is
not meant to be some kind of generic permission check, this is literally
meant as a "the open and link calls are 'atomic' wrt user credentials"
check.
It also means that you can't just move things between namespaces,
because the credentials aren't just a list of uid's and gid's: they
includes the pointer to the user_ns that the capabilities are relative
to.
So let's try this one more time and see if maybe this approach ends up
being workable after all.
Cc: Andrew Lutomirski <luto@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20240411001012.12513-1-torvalds@linux-foundation.org
[brauner: relax capability check to opener of the file]
Link: https://lore.kernel.org/all/20231113-undenkbar-gediegen-efde5f1c34bc@brauner
Signed-off-by: Christian Brauner <brauner@kernel.org>
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The UEFI specification does not make any mention of a maximum variable
name size, so the headers and implementation shouldn't claim that one
exists either.
Comments referring to this limit have been removed or rewritten, as this
is an implementation detail local to the Linux kernel.
Where appropriate, the magic value of 1024 has been replaced with
EFI_VAR_NAME_LEN, as this is used for the efi_variable struct
definition. This in itself does not change any behavior, but should
serve as points of interest when making future changes in the same area.
A related build-time check has been added to ensure that the special
512 byte sized buffer will not overflow with a potentially decreased
EFI_VAR_NAME_LEN.
Signed-off-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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The structure was moved to the efivarfs internals in commit 2d82e6227ea1
("efi: vars: Move efivar caching layer into efivarfs") after previously
being used as the data ABI for efivars until its removal in commit
0f5b2c69a4cb ("efi: vars: Remove deprecated 'efivars' sysfs interface").
As efivarfs only uses the structure for the variable name caching layer,
the data-related members were never in use. Remove them to avoid
implying that efivarfs is bound by the same restrictions that efivars
once had. While at it, remove the packed attribute, since we no longer
have to guarantee a stable layout.
Signed-off-by: Tim Schumacher <timschumi@gmx.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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Pull ceph fixes from Ilya Dryomov:
"Two CephFS fixes marked for stable and a MAINTAINERS update"
* tag 'ceph-for-6.9-rc4' of https://github.com/ceph/ceph-client:
MAINTAINERS: remove myself as a Reviewer for Ceph
ceph: switch to use cap_delay_lock for the unlink delay list
ceph: redirty page before returning AOP_WRITEPAGE_ACTIVATE
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git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing fixes from Steven Rostedt:
- Fix the buffer_percent accounting as it is dependent on three
variables:
1) pages_read - number of subbuffers read
2) pages_lost - number of subbuffers lost due to overwrite
3) pages_touched - number of pages that a writer entered
These three counters only increment, and to know how many active
pages there are on the buffer at any given time, the pages_read and
pages_lost are subtracted from pages_touched.
But the pages touched was incremented whenever any writer went to the
next subbuffer even if it wasn't the only one, so it was incremented
more than it should be causing the counter for how many subbuffers
currently have content incorrect, which caused the buffer_percent
that holds waiters until the ring buffer is filled to a given
percentage to wake up early.
- Fix warning of unused functions when PERF_EVENTS is not configured in
- Replace bad tab with space in Kconfig for FTRACE_RECORD_RECURSION_SIZE
- Fix to some kerneldoc function comments in eventfs code.
* tag 'trace-v6.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
ring-buffer: Only update pages_touched when a new page is touched
tracing: hide unused ftrace_event_id_fops
tracing: Fix FTRACE_RECORD_RECURSION_SIZE Kconfig entry
eventfs: Fix kernel-doc comments to functions
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It turns out - btree splits happen with the rest of the transaction
still locked, to avoid unnecessary restarts, which means using nofail
doesn't work here - we can deadlock.
Fortunately, we now have the ability to return errors here.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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Signed-off-by: Joakim Sindholt <opensource@zhasha.com>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
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This reverts commit be57855f505003c5cafff40338d5d0f23b00ba4d.
It caused a regression involving duplicate inode numbers in
some tester trees. The bad behavior seems to be dependent on inode
reuse policy in underlying file system, so it did not trigger in my
test setup.
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
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