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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 confidential computing update from Borislav Petkov:
- Add support for unaccepted memory as specified in the UEFI spec v2.9.
The gist of it all is that Intel TDX and AMD SEV-SNP confidential
computing guests define the notion of accepting memory before using
it and thus preventing a whole set of attacks against such guests
like memory replay and the like.
There are a couple of strategies of how memory should be accepted -
the current implementation does an on-demand way of accepting.
* tag 'x86_cc_for_v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
virt: sevguest: Add CONFIG_CRYPTO dependency
x86/efi: Safely enable unaccepted memory in UEFI
x86/sev: Add SNP-specific unaccepted memory support
x86/sev: Use large PSC requests if applicable
x86/sev: Allow for use of the early boot GHCB for PSC requests
x86/sev: Put PSC struct on the stack in prep for unaccepted memory support
x86/sev: Fix calculation of end address based on number of pages
x86/tdx: Add unaccepted memory support
x86/tdx: Refactor try_accept_one()
x86/tdx: Make _tdx_hypercall() and __tdx_module_call() available in boot stub
efi/unaccepted: Avoid load_unaligned_zeropad() stepping into unaccepted memory
efi: Add unaccepted memory support
x86/boot/compressed: Handle unaccepted memory
efi/libstub: Implement support for unaccepted memory
efi/x86: Get full memory map in allocate_e820()
mm: Add support for unaccepted memory
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Pull block updates from Jens Axboe:
- NVMe pull request via Keith:
- Various cleanups all around (Irvin, Chaitanya, Christophe)
- Better struct packing (Christophe JAILLET)
- Reduce controller error logs for optional commands (Keith)
- Support for >=64KiB block sizes (Daniel Gomez)
- Fabrics fixes and code organization (Max, Chaitanya, Daniel
Wagner)
- bcache updates via Coly:
- Fix a race at init time (Mingzhe Zou)
- Misc fixes and cleanups (Andrea, Thomas, Zheng, Ye)
- use page pinning in the block layer for dio (David)
- convert old block dio code to page pinning (David, Christoph)
- cleanups for pktcdvd (Andy)
- cleanups for rnbd (Guoqing)
- use the unchecked __bio_add_page() for the initial single page
additions (Johannes)
- fix overflows in the Amiga partition handling code (Michael)
- improve mq-deadline zoned device support (Bart)
- keep passthrough requests out of the IO schedulers (Christoph, Ming)
- improve support for flush requests, making them less special to deal
with (Christoph)
- add bdev holder ops and shutdown methods (Christoph)
- fix the name_to_dev_t() situation and use cases (Christoph)
- decouple the block open flags from fmode_t (Christoph)
- ublk updates and cleanups, including adding user copy support (Ming)
- BFQ sanity checking (Bart)
- convert brd from radix to xarray (Pankaj)
- constify various structures (Thomas, Ivan)
- more fine grained persistent reservation ioctl capability checks
(Jingbo)
- misc fixes and cleanups (Arnd, Azeem, Demi, Ed, Hengqi, Hou, Jan,
Jordy, Li, Min, Yu, Zhong, Waiman)
* tag 'for-6.5/block-2023-06-23' of git://git.kernel.dk/linux: (266 commits)
scsi/sg: don't grab scsi host module reference
ext4: Fix warning in blkdev_put()
block: don't return -EINVAL for not found names in devt_from_devname
cdrom: Fix spectre-v1 gadget
block: Improve kernel-doc headers
blk-mq: don't insert passthrough request into sw queue
bsg: make bsg_class a static const structure
ublk: make ublk_chr_class a static const structure
aoe: make aoe_class a static const structure
block/rnbd: make all 'class' structures const
block: fix the exclusive open mask in disk_scan_partitions
block: add overflow checks for Amiga partition support
block: change all __u32 annotations to __be32 in affs_hardblocks.h
block: fix signed int overflow in Amiga partition support
block: add capacity validation in bdev_add_partition()
block: fine-granular CAP_SYS_ADMIN for Persistent Reservation
block: disallow Persistent Reservation on partitions
reiserfs: fix blkdev_put() warning from release_journal_dev()
block: fix wrong mode for blkdev_get_by_dev() from disk_scan_partitions()
block: document the holder argument to blkdev_get_by_path
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Pull splice updates from Jens Axboe:
"This kills off ITER_PIPE to avoid a race between truncate,
iov_iter_revert() on the pipe and an as-yet incomplete DMA to a bio
with unpinned/unref'ed pages from an O_DIRECT splice read. This causes
memory corruption.
Instead, we either use (a) filemap_splice_read(), which invokes the
buffered file reading code and splices from the pagecache into the
pipe; (b) copy_splice_read(), which bulk-allocates a buffer, reads
into it and then pushes the filled pages into the pipe; or (c) handle
it in filesystem-specific code.
Summary:
- Rename direct_splice_read() to copy_splice_read()
- Simplify the calculations for the number of pages to be reclaimed
in copy_splice_read()
- Turn do_splice_to() into a helper, vfs_splice_read(), so that it
can be used by overlayfs and coda to perform the checks on the
lower fs
- Make vfs_splice_read() jump to copy_splice_read() to handle
direct-I/O and DAX
- Provide shmem with its own splice_read to handle non-existent pages
in the pagecache. We don't want a ->read_folio() as we don't want
to populate holes, but filemap_get_pages() requires it
- Provide overlayfs with its own splice_read to call down to a lower
layer as overlayfs doesn't provide ->read_folio()
- Provide coda with its own splice_read to call down to a lower layer
as coda doesn't provide ->read_folio()
- Direct ->splice_read to copy_splice_read() in tty, procfs, kernfs
and random files as they just copy to the output buffer and don't
splice pages
- Provide wrappers for afs, ceph, ecryptfs, ext4, f2fs, nfs, ntfs3,
ocfs2, orangefs, xfs and zonefs to do locking and/or revalidation
- Make cifs use filemap_splice_read()
- Replace pointers to generic_file_splice_read() with pointers to
filemap_splice_read() as DIO and DAX are handled in the caller;
filesystems can still provide their own alternate ->splice_read()
op
- Remove generic_file_splice_read()
- Remove ITER_PIPE and its paraphernalia as generic_file_splice_read
was the only user"
* tag 'for-6.5/splice-2023-06-23' of git://git.kernel.dk/linux: (31 commits)
splice: kdoc for filemap_splice_read() and copy_splice_read()
iov_iter: Kill ITER_PIPE
splice: Remove generic_file_splice_read()
splice: Use filemap_splice_read() instead of generic_file_splice_read()
cifs: Use filemap_splice_read()
trace: Convert trace/seq to use copy_splice_read()
zonefs: Provide a splice-read wrapper
xfs: Provide a splice-read wrapper
orangefs: Provide a splice-read wrapper
ocfs2: Provide a splice-read wrapper
ntfs3: Provide a splice-read wrapper
nfs: Provide a splice-read wrapper
f2fs: Provide a splice-read wrapper
ext4: Provide a splice-read wrapper
ecryptfs: Provide a splice-read wrapper
ceph: Provide a splice-read wrapper
afs: Provide a splice-read wrapper
9p: Add splice_read wrapper
net: Make sock_splice_read() use copy_splice_read() by default
tty, proc, kernfs, random: Use copy_splice_read()
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git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs updates from David Sterba:
"Mainly core changes, refactoring and optimizations.
Performance is improved in some areas, overall there may be a
cumulative improvement due to refactoring that removed lookups in the
IO path or simplified IO submission tracking.
Core:
- submit IO synchronously for fast checksums (crc32c and xxhash),
remove high priority worker kthread
- read extent buffer in one go, simplify IO tracking, bio submission
and locking
- remove additional tracking of redirtied extent buffers, originally
added for zoned mode but actually not needed
- track ordered extent pointer in bio to avoid rbtree lookups during
IO
- scrub, use recovered data stripes as cache to avoid unnecessary
read
- in zoned mode, optimize logical to physical mappings of extents
- remove PageError handling, not set by VFS nor writeback
- cleanups, refactoring, better structure packing
- lots of error handling improvements
- more assertions, lockdep annotations
- print assertion failure with the exact line where it happens
- tracepoint updates
- more debugging prints
Performance:
- speedup in fsync(), better tracking of inode logged status can
avoid transaction commit
- IO path structures track logical offsets in data structures and
does not need to look it up
User visible changes:
- don't commit transaction for every created subvolume, this can
reduce time when many subvolumes are created in a batch
- print affected files when relocation fails
- trigger orphan file cleanup during START_SYNC ioctl
Notable fixes:
- fix crash when disabling quota and relocation
- fix crashes when removing roots from drity list
- fix transacion abort during relocation when converting from newer
profiles not covered by fallback
- in zoned mode, stop reclaiming block groups if filesystem becomes
read-only
- fix rare race condition in tree mod log rewind that can miss some
btree node slots
- with enabled fsverity, drop up-to-date page bit in case the
verification fails"
* tag 'for-6.5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (194 commits)
btrfs: fix race between quota disable and relocation
btrfs: add comment to struct btrfs_fs_info::dirty_cowonly_roots
btrfs: fix race when deleting free space root from the dirty cow roots list
btrfs: fix race when deleting quota root from the dirty cow roots list
btrfs: tracepoints: also show actual number of the outstanding extents
btrfs: update i_version in update_dev_time
btrfs: make btrfs_compressed_bioset static
btrfs: add handling for RAID1C23/DUP to btrfs_reduce_alloc_profile
btrfs: scrub: remove btrfs_fs_info::scrub_wr_completion_workers
btrfs: scrub: remove scrub_ctx::csum_list member
btrfs: do not BUG_ON after failure to migrate space during truncation
btrfs: do not BUG_ON on failure to get dir index for new snapshot
btrfs: send: do not BUG_ON() on unexpected symlink data extent
btrfs: do not BUG_ON() when dropping inode items from log root
btrfs: replace BUG_ON() at split_item() with proper error handling
btrfs: do not BUG_ON() on tree mod log failures at btrfs_del_ptr()
btrfs: do not BUG_ON() on tree mod log failures at insert_ptr()
btrfs: do not BUG_ON() on tree mod log failure at insert_new_root()
btrfs: do not BUG_ON() on tree mod log failures at push_nodes_for_insert()
btrfs: abort transaction at update_ref_for_cow() when ref count is zero
...
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git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs
Pull zonefs updates from Damien Le Moal:
- Modify the synchronous direct write path to use iomap instead of
manually coding issuing zone append write BIOs (me)
- Use the FMODE_CAN_ODIRECT file flag to indicate support from direct
IO instead of using the old way with noop direct_io methods
(Christoph)
* tag 'zonefs-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
zonefs: set FMODE_CAN_ODIRECT instead of a dummy direct_IO method
zonefs: use iomap for synchronous direct writes
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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs updates from Gao Xiang:
"No outstanding new feature for this cycle.
Most of these commits are decompression cleanups which are part of the
ongoing development for subpage/folio compression support as well as
xattr cleanups for the upcoming xattr bloom filter optimization [1].
In addition, there are bugfixes to address some corner cases of
compressed images due to global data de-duplication and arm64 16k
pages.
Summary:
- Fix rare I/O hang on deduplicated compressed images due to loop
hooked chains
- Fix compact compression layout of 16k blocks on arm64 devices
- Fix atomic context detection of async decompression
- Decompression/Xattr code cleanups"
Link: https://lore.kernel.org/r/20230621083209.116024-1-jefflexu@linux.alibaba.com [1]
* tag 'erofs-for-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: clean up zmap.c
erofs: remove unnecessary goto
erofs: Fix detection of atomic context
erofs: use separate xattr parsers for listxattr/getxattr
erofs: unify inline/shared xattr iterators for listxattr/getxattr
erofs: make the size of read data stored in buffer_ofs
erofs: unify xattr_iter structures
erofs: use absolute position in xattr iterator
erofs: fix compact 4B support for 16k block size
erofs: convert erofs_read_metabuf() to erofs_bread() for xattr
erofs: use poison pointer to replace the hard-coded address
erofs: use struct lockref to replace handcrafted approach
erofs: adapt managed inode operations into folios
erofs: kill hooked chains to avoid loops on deduplicated compressed images
erofs: avoid on-stack pagepool directly passed by arguments
erofs: allocate extra bvec pages directly instead of retrying
erofs: clean up z_erofs_pcluster_readmore()
erofs: remove the member readahead from struct z_erofs_decompress_frontend
erofs: fold in z_erofs_decompress()
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Pull fsverity updates from Eric Biggers:
"Several updates for fs/verity/:
- Do all hashing with the shash API instead of with the ahash API.
This simplifies the code and reduces API overhead. It should also
make things slightly easier for XFS's upcoming support for
fsverity. It does drop fsverity's support for off-CPU hash
accelerators, but that support was incomplete and not known to be
used
- Update and export fsverity_get_digest() so that it's ready for
overlayfs's upcoming support for fsverity checking of lowerdata
- Improve the documentation for builtin signature support
- Fix a bug in the large folio support"
* tag 'fsverity-for-linus' of git://git.kernel.org/pub/scm/fs/fsverity/linux:
fsverity: improve documentation for builtin signature support
fsverity: rework fsverity_get_digest() again
fsverity: simplify error handling in verify_data_block()
fsverity: don't use bio_first_page_all() in fsverity_verify_bio()
fsverity: constify fsverity_hash_alg
fsverity: use shash API instead of ahash API
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Pull fscrypt update from Eric Biggers:
"Just one flex array conversion patch"
* tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/linux:
fscrypt: Replace 1-element array with flexible array
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Pull nfsd updates from Chuck Lever:
- Clean-ups in the READ path in anticipation of MSG_SPLICE_PAGES
- Better NUMA awareness when allocating pages and other objects
- A number of minor clean-ups to XDR encoding
- Elimination of a race when accepting a TCP socket
- Numerous observability enhancements
* tag 'nfsd-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (46 commits)
nfsd: remove redundant assignments to variable len
svcrdma: Fix stale comment
NFSD: Distinguish per-net namespace initialization
nfsd: move init of percpu reply_cache_stats counters back to nfsd_init_net
SUNRPC: Address RCU warning in net/sunrpc/svc.c
SUNRPC: Use sysfs_emit in place of strlcpy/sprintf
SUNRPC: Remove transport class dprintk call sites
SUNRPC: Fix comments for transport class registration
svcrdma: Remove an unused argument from __svc_rdma_put_rw_ctxt()
svcrdma: trace cc_release calls
svcrdma: Convert "might sleep" comment into a code annotation
NFSD: Add an nfsd4_encode_nfstime4() helper
SUNRPC: Move initialization of rq_stime
SUNRPC: Optimize page release in svc_rdma_sendto()
svcrdma: Prevent page release when nothing was received
svcrdma: Revert 2a1e4f21d841 ("svcrdma: Normalize Send page handling")
SUNRPC: Revert 579900670ac7 ("svcrdma: Remove unused sc_pages field")
SUNRPC: Revert cc93ce9529a6 ("svcrdma: Retain the page backing rq_res.head[0].iov_base")
NFSD: add encoding of op_recall flag for write delegation
NFSD: Add "official" reviewers for this subsystem
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git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs mount updates from Christian Brauner:
"This contains the work to extend move_mount() to allow adding a mount
beneath the topmost mount of a mount stack.
There are two LWN articles about this. One covers the original patch
series in [1]. The other in [2] summarizes the session and roughly the
discussion between Al and me at LSFMM. The second article also goes
into some good questions from attendees.
Since all details are found in the relevant commit with a technical
dive into semantics and locking at the end I'm only adding the
motivation and core functionality for this from commit message and
leave out the invasive details. The code is also heavily commented and
annotated as well which was explicitly requested.
TL;DR:
> mount -t ext4 /dev/sda /mnt
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└─/mnt /dev/sda ext4
> mount --beneath -t xfs /dev/sdb /mnt
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└─/mnt /dev/sdb xfs
└─/mnt /dev/sda ext4
> umount /mnt
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└─/mnt /dev/sdb xfs
The longer motivation is that various distributions are adding or are
in the process of adding support for system extensions and in the
future configuration extensions through various tools. A more detailed
explanation on system and configuration extensions can be found on the
manpage which is listed below at [3].
System extension images may – dynamically at runtime — extend the
/usr/ and /opt/ directory hierarchies with additional files. This is
particularly useful on immutable system images where a /usr/ and/or
/opt/ hierarchy residing on a read-only file system shall be extended
temporarily at runtime without making any persistent modifications.
When one or more system extension images are activated, their /usr/
and /opt/ hierarchies are combined via overlayfs with the same
hierarchies of the host OS, and the host /usr/ and /opt/ overmounted
with it ("merging"). When they are deactivated, the mount point is
disassembled — again revealing the unmodified original host version of
the hierarchy ("unmerging"). Merging thus makes the extension's
resources suddenly appear below the /usr/ and /opt/ hierarchies as if
they were included in the base OS image itself. Unmerging makes them
disappear again, leaving in place only the files that were shipped
with the base OS image itself.
System configuration images are similar but operate on directories
containing system or service configuration.
On nearly all modern distributions mount propagation plays a crucial
role and the rootfs of the OS is a shared mount in a peer group
(usually with peer group id 1):
TARGET SOURCE FSTYPE PROPAGATION MNT_ID PARENT_ID
/ / ext4 shared:1 29 1
On such systems all services and containers run in a separate mount
namespace and are pivot_root()ed into their rootfs. A separate mount
namespace is almost always used as it is the minimal isolation
mechanism services have. But usually they are even much more isolated
up to the point where they almost become indistinguishable from
containers.
Mount propagation again plays a crucial role here. The rootfs of all
these services is a slave mount to the peer group of the host rootfs.
This is done so the service will receive mount propagation events from
the host when certain files or directories are updated.
In addition, the rootfs of each service, container, and sandbox is
also a shared mount in its separate peer group:
TARGET SOURCE FSTYPE PROPAGATION MNT_ID PARENT_ID
/ / ext4 shared:24 master:1 71 47
For people not too familiar with mount propagation, the master:1 means
that this is a slave mount to peer group 1. Which as one can see is
the host rootfs as indicated by shared:1 above. The shared:24
indicates that the service rootfs is a shared mount in a separate peer
group with peer group id 24.
A service may run other services. Such nested services will also have
a rootfs mount that is a slave to the peer group of the outer service
rootfs mount.
For containers things are just slighly different. A container's rootfs
isn't a slave to the service's or host rootfs' peer group. The rootfs
mount of a container is simply a shared mount in its own peer group:
TARGET SOURCE FSTYPE PROPAGATION MNT_ID PARENT_ID
/home/ubuntu/debian-tree / ext4 shared:99 61 60
So whereas services are isolated OS components a container is treated
like a separate world and mount propagation into it is restricted to a
single well known mount that is a slave to the peer group of the
shared mount /run on the host:
TARGET SOURCE FSTYPE PROPAGATION MNT_ID PARENT_ID
/propagate/debian-tree /run/host/incoming tmpfs master:5 71 68
Here, the master:5 indicates that this mount is a slave to the peer
group with peer group id 5. This allows to propagate mounts into the
container and served as a workaround for not being able to insert
mounts into mount namespaces directly. But the new mount api does
support inserting mounts directly. For the interested reader the
blogpost in [4] might be worth reading where I explain the old and the
new approach to inserting mounts into mount namespaces.
Containers of course, can themselves be run as services. They often
run full systems themselves which means they again run services and
containers with the exact same propagation settings explained above.
The whole system is designed so that it can be easily updated,
including all services in various fine-grained ways without having to
enter every single service's mount namespace which would be
prohibitively expensive. The mount propagation layout has been
carefully chosen so it is possible to propagate updates for system
extensions and configurations from the host into all services.
The simplest model to update the whole system is to mount on top of
/usr, /opt, or /etc on the host. The new mount on /usr, /opt, or /etc
will then propagate into every service. This works cleanly the first
time. However, when the system is updated multiple times it becomes
necessary to unmount the first update on /opt, /usr, /etc and then
propagate the new update. But this means, there's an interval where
the old base system is accessible. This has to be avoided to protect
against downgrade attacks.
The vfs already exposes a mechanism to userspace whereby mounts can be
mounted beneath an existing mount. Such mounts are internally referred
to as "tucked". The patch series exposes the ability to mount beneath
a top mount through the new MOVE_MOUNT_BENEATH flag for the
move_mount() system call. This allows userspace to seamlessly upgrade
mounts. After this series the only thing that will have changed is
that mounting beneath an existing mount can be done explicitly instead
of just implicitly.
The crux is that the proposed mechanism already exists and that it is
so powerful as to cover cases where mounts are supposed to be updated
with new versions. Crucially, it offers an important flexibility.
Namely that updates to a system may either be forced or can be delayed
and the umount of the top mount be left to a service if it is a
cooperative one"
Link: https://lwn.net/Articles/927491 [1]
Link: https://lwn.net/Articles/934094 [2]
Link: https://man7.org/linux/man-pages/man8/systemd-sysext.8.html [3]
Link: https://brauner.io/2023/02/28/mounting-into-mount-namespaces.html [4]
Link: https://github.com/flatcar/sysext-bakery
Link: https://fedoraproject.org/wiki/Changes/Unified_Kernel_Support_Phase_1
Link: https://fedoraproject.org/wiki/Changes/Unified_Kernel_Support_Phase_2
Link: https://github.com/systemd/systemd/pull/26013
* tag 'v6.5/vfs.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
fs: allow to mount beneath top mount
fs: use a for loop when locking a mount
fs: properly document __lookup_mnt()
fs: add path_mounted()
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git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs file handling updates from Christian Brauner:
"This contains Amir's work to fix a long-standing problem where an
unprivileged overlayfs mount can be used to avoid fanotify permission
events that were requested for an inode or superblock on the
underlying filesystem.
Some background about files opened in overlayfs. If a file is opened
in overlayfs @file->f_path will refer to a "fake" path. What this
means is that while @file->f_inode will refer to inode of the
underlying layer, @file->f_path refers to an overlayfs
{dentry,vfsmount} pair. The reasons for doing this are out of scope
here but it is the reason why the vfs has been providing the
open_with_fake_path() helper for overlayfs for very long time now. So
nothing new here.
This is for sure not very elegant and everyone including the overlayfs
maintainers agree. Improving this significantly would involve more
fragile and potentially rather invasive changes.
In various codepaths access to the path of the underlying filesystem
is needed for such hybrid file. The best example is fsnotify where
this becomes security relevant. Passing the overlayfs
@file->f_path->dentry will cause fsnotify to skip generating fsnotify
events registered on the underlying inode or superblock.
To fix this we extend the vfs provided open_with_fake_path() concept
for overlayfs to create a backing file container that holds the real
path and to expose a helper that can be used by relevant callers to
get access to the path of the underlying filesystem through the new
file_real_path() helper. This pattern is similar to what we do in
d_real() and d_real_inode().
The first beneficiary is fsnotify and fixes the security sensitive
problem mentioned above.
There's a couple of nice cleanups included as well.
Over time, the old open_with_fake_path() helper added specifically for
overlayfs a long time ago started to get used in other places such as
cachefiles. Even though cachefiles have nothing to do with hybrid
files.
The only reason cachefiles used that concept was that files opened
with open_with_fake_path() aren't charged against the caller's open
file limit by raising FMODE_NOACCOUNT. It's just mere coincidence that
both overlayfs and cachefiles need to ensure to not overcharge the
caller for their internal open calls.
So this work disentangles FMODE_NOACCOUNT use cases and backing file
use-cases by adding the FMODE_BACKING flag which indicates that the
file can be used to retrieve the backing file of another filesystem.
(Fyi, Jens will be sending you a really nice cleanup from Christoph
that gets rid of 3 FMODE_* flags otherwise this would be the last
fmode_t bit we'd be using.)
So now overlayfs becomes the sole user of the renamed
open_with_fake_path() helper which is now named backing_file_open().
For internal kernel users such as cachefiles that are only interested
in FMODE_NOACCOUNT but not in FMODE_BACKING we add a new
kernel_file_open() helper which opens a file without being charged
against the caller's open file limit. All new helpers are properly
documented and clearly annotated to mention their special uses.
We also rename vfs_tmpfile_open() to kernel_tmpfile_open() to clearly
distinguish it from vfs_tmpfile() and align it the other kernel_*()
internal helpers"
* tag 'v6.5/vfs.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
ovl: enable fsnotify events on underlying real files
fs: use backing_file container for internal files with "fake" f_path
fs: move kmem_cache_zalloc() into alloc_empty_file*() helpers
fs: use a helper for opening kernel internal files
fs: rename {vfs,kernel}_tmpfile_open()
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git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull vfs rename locking updates from Christian Brauner:
"This contains the work from Jan to fix problems with cross-directory
renames originally reported in [1].
To quickly sum it up some filesystems (so far we know at least about
ext4, udf, f2fs, ocfs2, likely also reiserfs, gfs2 and others) need to
lock the directory when it is being renamed into another directory.
This is because we need to update the parent pointer in the directory
in that case and if that races with other operations on the directory,
in particular a conversion from one directory format into another, bad
things can happen.
So far we've done the locking in the filesystem code but recently
Darrick pointed out in [2] that the RENAME_EXCHANGE case was missing.
That one is particularly nasty because RENAME_EXCHANGE can arbitrarily
mix regular files and directories and proper lock ordering is not
achievable in the filesystems alone.
This patch set adds locking into vfs_rename() so that not only parent
directories but also moved inodes, regardless of whether they are
directories or not, are locked when calling into the filesystem.
This means establishing a locking order for unrelated directories. New
helpers are added for this purpose and our documentation is updated to
cover this in detail.
The locking is now actually easier to follow as we now always lock
source and target. We've always locked the target independent of
whether it was a directory or file and we've always locked source if
it was a regular file. The exact details for why this came about can
be found in [3] and [4]"
Link: https://lore.kernel.org/all/20230117123735.un7wbamlbdihninm@quack3 [1]
Link: https://lore.kernel.org/all/20230517045836.GA11594@frogsfrogsfrogs [2]
Link: https://lore.kernel.org/all/20230526-schrebergarten-vortag-9cd89694517e@brauner [3]
Link: https://lore.kernel.org/all/20230530-seenotrettung-allrad-44f4b00139d4@brauner [4]
* tag 'v6.5/vfs.rename.locking' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
fs: Restrict lock_two_nondirectories() to non-directory inodes
fs: Lock moved directories
fs: Establish locking order for unrelated directories
Revert "f2fs: fix potential corruption when moving a directory"
Revert "udf: Protect rename against modification of moved directory"
ext4: Remove ext4 locking of moved directory
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull misc vfs updates from Christian Brauner:
"Miscellaneous features, cleanups, and fixes for vfs and individual fs
Features:
- Use mode 0600 for file created by cachefilesd so it can be run by
unprivileged users. This aligns them with directories which are
already created with mode 0700 by cachefilesd
- Reorder a few members in struct file to prevent some false sharing
scenarios
- Indicate that an eventfd is used a semaphore in the eventfd's
fdinfo procfs file
- Add a missing uapi header for eventfd exposing relevant uapi
defines
- Let the VFS protect transitions of a superblock from read-only to
read-write in addition to the protection it already provides for
transitions from read-write to read-only. Protecting read-only to
read-write transitions allows filesystems such as ext4 to perform
internal writes, keeping writers away until the transition is
completed
Cleanups:
- Arnd removed the architecture specific arch_report_meminfo()
prototypes and added a generic one into procfs.h. Note, we got a
report about a warning in amdpgpu codepaths that suggested this was
bisectable to this change but we concluded it was a false positive
- Remove unused parameters from split_fs_names()
- Rename put_and_unmap_page() to unmap_and_put_page() to let the name
reflect the order of the cleanup operation that has to unmap before
the actual put
- Unexport buffer_check_dirty_writeback() as it is not used outside
of block device aops
- Stop allocating aio rings from highmem
- Protecting read-{only,write} transitions in the VFS used open-coded
barriers in various places. Replace them with proper little helpers
and document both the helpers and all barrier interactions involved
when transitioning between read-{only,write} states
- Use flexible array members in old readdir codepaths
Fixes:
- Use the correct type __poll_t for epoll and eventfd
- Replace all deprecated strlcpy() invocations, whose return value
isn't checked with an equivalent strscpy() call
- Fix some kernel-doc warnings in fs/open.c
- Reduce the stack usage in jffs2's xattr codepaths finally getting
rid of this: fs/jffs2/xattr.c:887:1: error: the frame size of 1088
bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
royally annoying compilation warning
- Use __FMODE_NONOTIFY instead of FMODE_NONOTIFY where an int and not
fmode_t is required to avoid fmode_t to integer degradation
warnings
- Create coredumps with O_WRONLY instead of O_RDWR. There's a long
explanation in that commit how O_RDWR is actually a bug which we
found out with the help of Linus and git archeology
- Fix "no previous prototype" warnings in the pipe codepaths
- Add overflow calculations for remap_verify_area() as a signed
addition overflow could be triggered in xfstests
- Fix a null pointer dereference in sysv
- Use an unsigned variable for length calculations in jfs avoiding
compilation warnings with gcc 13
- Fix a dangling pipe pointer in the watch queue codepath
- The legacy mount option parser provided as a fallback by the VFS
for filesystems not yet converted to the new mount api did prefix
the generated mount option string with a leading ',' causing issues
for some filesystems
- Fix a repeated word in a comment in fs.h
- autofs: Update the ctime when mtime is updated as mandated by
POSIX"
* tag 'v6.5/vfs.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (27 commits)
readdir: Replace one-element arrays with flexible-array members
fs: Provide helpers for manipulating sb->s_readonly_remount
fs: Protect reconfiguration of sb read-write from racing writes
eventfd: add a uapi header for eventfd userspace APIs
autofs: set ctime as well when mtime changes on a dir
eventfd: show the EFD_SEMAPHORE flag in fdinfo
fs/aio: Stop allocating aio rings from HIGHMEM
fs: Fix comment typo
fs: unexport buffer_check_dirty_writeback
fs: avoid empty option when generating legacy mount string
watch_queue: prevent dangling pipe pointer
fs.h: Optimize file struct to prevent false sharing
highmem: Rename put_and_unmap_page() to unmap_and_put_page()
cachefiles: Allow the cache to be non-root
init: remove unused names parameter in split_fs_names()
jfs: Use unsigned variable for length calculations
fs/sysv: Null check to prevent null-ptr-deref bug
fs: use UB-safe check for signed addition overflow in remap_verify_area
procfs: consolidate arch_report_meminfo declaration
fs: pipe: reveal missing function protoypes
...
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull ntfs updates from Christian Brauner:
"A pile of various smaller fixes for ntfs"
* tag 'v6.5/fs.ntfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
ntfs: do not dereference a null ctx on error
ntfs: Remove unneeded semicolon
ntfs: Correct spelling
ntfs: remove redundant initialization to pointer cb_sb_start
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fix from David Sterba:
"Unfortunately the recent u32 overflow fix was not complete, there was
one conversion left, assertion not triggered by my tests but caught by
Qu's fstests case.
The "cleanup for later" has been promoted to a proper fix and wraps
all uses of the stripe left shift so the diffstat has grown but leaves
no potentially problematic uses.
We should have done it that way before, sorry"
* tag 'for-6.4-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix remaining u32 overflows when left shifting stripe_nr
|
|
ext4_blkdev_remove() passes a wrong holder pointer to blkdev_put() which
triggers a warning there. Fix it.
Fixes: 2736e8eeb0cc ("block: use the holder as indication for exclusive opens")
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230622165107.13687-1-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
There was regression caused by a97699d1d610 ("btrfs: replace
map_lookup->stripe_len by BTRFS_STRIPE_LEN") and supposedly fixed by
a7299a18a179 ("btrfs: fix u32 overflows when left shifting stripe_nr").
To avoid code churn the fix was open coding the type casts but
unfortunately missed one which was still possible to hit [1].
The missing place was assignment of bioc->full_stripe_logical inside
btrfs_map_block().
Fix it by adding a helper that does the safe calculation of the offset
and use it everywhere even though it may not be strictly necessary due
to already using u64 types. This replaces all remaining
"<< BTRFS_STRIPE_LEN_SHIFT" calls.
[1] https://lore.kernel.org/linux-btrfs/20230622065438.86402-1-wqu@suse.com/
Fixes: a7299a18a179 ("btrfs: fix u32 overflows when left shifting stripe_nr")
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
Several trivial cleanups which aren't quite necessary to split:
- Rename lcluster load functions as well as justify full indexes
since they are typically used for global deduplication for
compressed data;
- Avoid unnecessary lines, comments for simplicity.
No logic changes.
Reviewed-by: Guo Xuenan <guoxuenan@huaweicloud.com>
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230615064421.103178-1-hsiangkao@linux.alibaba.com
|
|
It's redundant, let's remove it.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230615034539.14286-1-frank.li@vivo.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
|
|
Current check for atomic context is not sufficient as
z_erofs_decompressqueue_endio can be called under rcu lock
from blk_mq_flush_plug_list(). See the stacktrace [1]
In such case we should hand off the decompression work for async
processing rather than trying to do sync decompression in current
context. Patch fixes the detection by checking for
rcu_read_lock_any_held() and while at it use more appropriate
!in_task() check than in_atomic().
Background: Historically erofs would always schedule a kworker for
decompression which would incur the scheduling cost regardless of
the context. But z_erofs_decompressqueue_endio() may not always
be in atomic context and we could actually benefit from doing the
decompression in z_erofs_decompressqueue_endio() if we are in
thread context, for example when running with dm-verity.
This optimization was later added in patch [2] which has shown
improvement in performance benchmarks.
==============================================
[1] Problem stacktrace
[name:core&]BUG: sleeping function called from invalid context at kernel/locking/mutex.c:291
[name:core&]in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1615, name: CpuMonitorServi
[name:core&]preempt_count: 0, expected: 0
[name:core&]RCU nest depth: 1, expected: 0
CPU: 7 PID: 1615 Comm: CpuMonitorServi Tainted: G S W OE 6.1.25-android14-5-maybe-dirty-mainline #1
Hardware name: MT6897 (DT)
Call trace:
dump_backtrace+0x108/0x15c
show_stack+0x20/0x30
dump_stack_lvl+0x6c/0x8c
dump_stack+0x20/0x48
__might_resched+0x1fc/0x308
__might_sleep+0x50/0x88
mutex_lock+0x2c/0x110
z_erofs_decompress_queue+0x11c/0xc10
z_erofs_decompress_kickoff+0x110/0x1a4
z_erofs_decompressqueue_endio+0x154/0x180
bio_endio+0x1b0/0x1d8
__dm_io_complete+0x22c/0x280
clone_endio+0xe4/0x280
bio_endio+0x1b0/0x1d8
blk_update_request+0x138/0x3a4
blk_mq_plug_issue_direct+0xd4/0x19c
blk_mq_flush_plug_list+0x2b0/0x354
__blk_flush_plug+0x110/0x160
blk_finish_plug+0x30/0x4c
read_pages+0x2fc/0x370
page_cache_ra_unbounded+0xa4/0x23c
page_cache_ra_order+0x290/0x320
do_sync_mmap_readahead+0x108/0x2c0
filemap_fault+0x19c/0x52c
__do_fault+0xc4/0x114
handle_mm_fault+0x5b4/0x1168
do_page_fault+0x338/0x4b4
do_translation_fault+0x40/0x60
do_mem_abort+0x60/0xc8
el0_da+0x4c/0xe0
el0t_64_sync_handler+0xd4/0xfc
el0t_64_sync+0x1a0/0x1a4
[2] Link: https://lore.kernel.org/all/20210317035448.13921-1-huangjianan@oppo.com/
Reported-by: Will Shiu <Will.Shiu@mediatek.com>
Suggested-by: Gao Xiang <xiang@kernel.org>
Signed-off-by: Sandeep Dhavale <dhavale@google.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://lore.kernel.org/r/20230621220848.3379029-1-dhavale@google.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
|
|
There are a few assignments to variable len where the value is not
being read and so the assignments are redundant and can be removed.
In one case, the variable len can be removed completely. Cleans up
4 clang scan warnings of the form:
fs/nfsd/export.c:100:7: warning: Although the value stored to 'len'
is used in the enclosing expression, the value is never actually
read from 'len' [deadcode.DeadStores]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
|
|
One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element arrays with flexible-array
members in multiple structures.
Address the following -Wstringop-overflow warnings seen when built
m68k architecture with m5307c3_defconfig configuration:
In function '__put_user_fn',
inlined from 'fillonedir' at fs/readdir.c:170:2:
include/asm-generic/uaccess.h:49:35: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
49 | *(u8 __force *)to = *(u8 *)from;
| ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
fs/readdir.c: In function 'fillonedir':
fs/readdir.c:134:25: note: at offset 1 into destination object 'd_name' of size 1
134 | char d_name[1];
| ^~~~~~
In function '__put_user_fn',
inlined from 'filldir' at fs/readdir.c:257:2:
include/asm-generic/uaccess.h:49:35: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
49 | *(u8 __force *)to = *(u8 *)from;
| ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
fs/readdir.c: In function 'filldir':
fs/readdir.c:211:25: note: at offset 1 into destination object 'd_name' of size 1
211 | char d_name[1];
| ^~~~~~
This helps with the ongoing efforts to globally enable
-Wstringop-overflow.
This results in no differences in binary output.
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/312
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Message-Id: <ZJHiPJkNKwxkKz1c@work>
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
|
fsverity builtin signatures (CONFIG_FS_VERITY_BUILTIN_SIGNATURES) aren't
the only way to do signatures with fsverity, and they have some major
limitations. Yet, more users have tried to use them, e.g. recently by
https://github.com/ostreedev/ostree/pull/2640. In most cases this seems
to be because users aren't sufficiently familiar with the limitations of
this feature and what the alternatives are.
Therefore, make some updates to the documentation to try to clarify the
properties of this feature and nudge users in the right direction.
Note that the Integrity Policy Enforcement (IPE) LSM, which is not yet
upstream, is planned to use the builtin signatures. (This differs from
IMA, which uses its own signature mechanism.) For that reason, my
earlier patch "fsverity: mark builtin signatures as deprecated"
(https://lore.kernel.org/r/20221208033548.122704-1-ebiggers@kernel.org),
which marked builtin signatures as "deprecated", was controversial.
This patch therefore stops short of marking the feature as deprecated.
I've also revised the language to focus on better explaining the feature
and what its alternatives are.
Link: https://lore.kernel.org/r/20230620041937.5809-1-ebiggers@kernel.org
Reviewed-by: Colin Walters <walters@verbum.org>
Reviewed-by: Luca Boccassi <bluca@debian.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull hotfixes from Andrew Morton:
"19 hotfixes. 8 of these are cc:stable.
This includes a wholesale reversion of the post-6.4 series 'make slab
shrink lockless'. After input from Dave Chinner it has been decided
that we should go a different way [1]"
Link: https://lkml.kernel.org/r/ZH6K0McWBeCjaf16@dread.disaster.area [1]
* tag 'mm-hotfixes-stable-2023-06-20-12-31' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
selftests/mm: fix cross compilation with LLVM
mailmap: add entries for Ben Dooks
nilfs2: prevent general protection fault in nilfs_clear_dirty_page()
Revert "mm: vmscan: make global slab shrink lockless"
Revert "mm: vmscan: make memcg slab shrink lockless"
Revert "mm: vmscan: add shrinker_srcu_generation"
Revert "mm: shrinkers: make count and scan in shrinker debugfs lockless"
Revert "mm: vmscan: hold write lock to reparent shrinker nr_deferred"
Revert "mm: vmscan: remove shrinker_rwsem from synchronize_shrinkers()"
Revert "mm: shrinkers: convert shrinker_rwsem to mutex"
nilfs2: fix buffer corruption due to concurrent device reads
scripts/gdb: fix SB_* constants parsing
scripts: fix the gfp flags header path in gfp-translate
udmabuf: revert 'Add support for mapping hugepages (v4)'
mm/khugepaged: fix iteration in collapse_file
memfd: check for non-NULL file_seals in memfd_create() syscall
mm/vmalloc: do not output a spurious warning when huge vmalloc() fails
mm/mprotect: fix do_mprotect_pkey() limit check
writeback: fix dereferencing NULL mapping->host on writeback_page_template
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fix from David Sterba:
"One more regression fix for an assertion failure that uncovered a
nasty problem with stripe calculations. This is caused by a u32
overflow when there are enough devices. The fstests require 6 so this
hasn't been caught, I was able to hit it with 8.
The fix is minimal and only adds u64 casts, we'll clean that up later.
I did various additional tests to be sure"
* tag 'for-6.4-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: fix u32 overflows when left shifting stripe_nr
|
|
Pull smb server fixes from Steve French:
"Four smb3 server fixes, all also for stable:
- fix potential oops in parsing compounded requests
- fix various paths (mkdir, create etc) where mnt_want_write was not
checked first
- fix slab out of bounds in check_message and write"
* tag '6.4-rc6-smb3-server-fixes' of git://git.samba.org/ksmbd:
ksmbd: validate session id and tree id in the compound request
ksmbd: fix out-of-bound read in smb2_write
ksmbd: add mnt_want_write to ksmbd vfs functions
ksmbd: validate command payload size
|
|
[BUG]
David reported an ASSERT() get triggered during fio load on 8 devices
with data/raid6 and metadata/raid1c3:
fio --rw=randrw --randrepeat=1 --size=3000m \
--bsrange=512b-64k --bs_unaligned \
--ioengine=libaio --fsync=1024 \
--name=job0 --name=job1 \
The ASSERT() is from rbio_add_bio() of raid56.c:
ASSERT(orig_logical >= full_stripe_start &&
orig_logical + orig_len <= full_stripe_start +
rbio->nr_data * BTRFS_STRIPE_LEN);
Which is checking if the target rbio is crossing the full stripe
boundary.
[100.789] assertion failed: orig_logical >= full_stripe_start && orig_logical + orig_len <= full_stripe_start + rbio->nr_data * BTRFS_STRIPE_LEN, in fs/btrfs/raid56.c:1622
[100.795] ------------[ cut here ]------------
[100.796] kernel BUG at fs/btrfs/raid56.c:1622!
[100.797] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[100.798] CPU: 1 PID: 100 Comm: kworker/u8:4 Not tainted 6.4.0-rc6-default+ #124
[100.799] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552-rebuilt.opensuse.org 04/01/2014
[100.802] Workqueue: writeback wb_workfn (flush-btrfs-1)
[100.803] RIP: 0010:rbio_add_bio+0x204/0x210 [btrfs]
[100.806] RSP: 0018:ffff888104a8f300 EFLAGS: 00010246
[100.808] RAX: 00000000000000a1 RBX: ffff8881075907e0 RCX: ffffed1020951e01
[100.809] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[100.811] RBP: 0000000141d20000 R08: 0000000000000001 R09: ffff888104a8f04f
[100.813] R10: ffffed1020951e09 R11: 0000000000000003 R12: ffff88810e87f400
[100.815] R13: 0000000041d20000 R14: 0000000144529000 R15: ffff888101524000
[100.817] FS: 0000000000000000(0000) GS:ffff88811ac00000(0000) knlGS:0000000000000000
[100.821] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[100.822] CR2: 000055d54e44c270 CR3: 000000010a9a1006 CR4: 00000000003706a0
[100.824] Call Trace:
[100.825] <TASK>
[100.825] ? die+0x32/0x80
[100.826] ? do_trap+0x12d/0x160
[100.827] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.827] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.829] ? do_error_trap+0x90/0x130
[100.830] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.831] ? handle_invalid_op+0x2c/0x30
[100.833] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.835] ? exc_invalid_op+0x29/0x40
[100.836] ? asm_exc_invalid_op+0x16/0x20
[100.837] ? rbio_add_bio+0x204/0x210 [btrfs]
[100.837] raid56_parity_write+0x64/0x270 [btrfs]
[100.838] btrfs_submit_chunk+0x26e/0x800 [btrfs]
[100.840] ? btrfs_bio_init+0x80/0x80 [btrfs]
[100.841] ? release_pages+0x503/0x6d0
[100.842] ? folio_unlock+0x2f/0x60
[100.844] ? __folio_put+0x60/0x60
[100.845] ? btrfs_do_readpage+0xae0/0xae0 [btrfs]
[100.847] btrfs_submit_bio+0x21/0x60 [btrfs]
[100.847] submit_one_bio+0x6a/0xb0 [btrfs]
[100.849] extent_write_cache_pages+0x395/0x680 [btrfs]
[100.850] ? __extent_writepage+0x520/0x520 [btrfs]
[100.851] ? mark_usage+0x190/0x190
[100.852] extent_writepages+0xdb/0x130 [btrfs]
[100.853] ? extent_write_locked_range+0x480/0x480 [btrfs]
[100.854] ? mark_usage+0x190/0x190
[100.854] ? attach_extent_buffer_page+0x220/0x220 [btrfs]
[100.855] ? reacquire_held_locks+0x178/0x280
[100.856] ? writeback_sb_inodes+0x245/0x7f0
[100.857] do_writepages+0x102/0x2e0
[100.858] ? page_writeback_cpu_online+0x10/0x10
[100.859] ? __lock_release.isra.0+0x14a/0x4d0
[100.860] ? reacquire_held_locks+0x280/0x280
[100.861] ? __lock_acquired+0x1e9/0x3d0
[100.862] ? do_raw_spin_lock+0x1b0/0x1b0
[100.863] __writeback_single_inode+0x94/0x450
[100.864] writeback_sb_inodes+0x372/0x7f0
[100.864] ? lock_sync+0xd0/0xd0
[100.865] ? do_raw_spin_unlock+0x93/0xf0
[100.866] ? sync_inode_metadata+0xc0/0xc0
[100.867] ? rwsem_optimistic_spin+0x340/0x340
[100.868] __writeback_inodes_wb+0x70/0x130
[100.869] wb_writeback+0x2d1/0x530
[100.869] ? __writeback_inodes_wb+0x130/0x130
[100.870] ? lockdep_hardirqs_on_prepare.part.0+0xf1/0x1c0
[100.870] wb_do_writeback+0x3eb/0x480
[100.871] ? wb_writeback+0x530/0x530
[100.871] ? mark_lock_irq+0xcd0/0xcd0
[100.872] wb_workfn+0xe0/0x3f0<
[CAUSE]
Commit a97699d1d610 ("btrfs: replace map_lookup->stripe_len by
BTRFS_STRIPE_LEN") changes how we calculate the map length, to reduce
u64 division.
Function btrfs_max_io_len() is to get the length to the stripe boundary.
It calculates the full stripe start offset (inside the chunk) by the
following code:
*full_stripe_start =
rounddown(*stripe_nr, nr_data_stripes(map)) <<
BTRFS_STRIPE_LEN_SHIFT;
The calculation itself is fine, but the value returned by rounddown() is
dependent on both @stripe_nr (which is u32) and nr_data_stripes() (which
returned int).
Thus the result is also u32, then we do the left shift, which can
overflow u32.
If such overflow happens, @full_stripe_start will be a value way smaller
than @offset, causing later "full_stripe_len - (offset -
*full_stripe_start)" to underflow, thus make later length calculation to
have no stripe boundary limit, resulting a write bio to exceed stripe
boundary.
There are some other locations like this, with a u32 @stripe_nr got left
shift, which can lead to a similar overflow.
[FIX]
Fix all @stripe_nr with left shift with a type cast to u64 before the
left shift.
Those involved @stripe_nr or similar variables are recording the stripe
number inside the chunk, which is small enough to be contained by u32,
but their offset inside the chunk can not fit into u32.
Thus for those specific left shifts, a type cast to u64 is necessary so
this patch does not touch them and the code will be cleaned up in the
future to keep the fix minimal.
Reported-by: David Sterba <dsterba@suse.com>
Fixes: a97699d1d610 ("btrfs: replace map_lookup->stripe_len by BTRFS_STRIPE_LEN")
Tested-by: David Sterba <dsterba@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
In journal_init_dev(), if super bdev is used as 'j_dev_bd', then
blkdev_get_by_dev() is called with NULL holder, otherwise, holder will
be journal. However, later in release_journal_dev(), blkdev_put() is
called with journal unconditionally, cause following warning:
WARNING: CPU: 1 PID: 5034 at block/bdev.c:617 bd_end_claim block/bdev.c:617 [inline]
WARNING: CPU: 1 PID: 5034 at block/bdev.c:617 blkdev_put+0x562/0x8a0 block/bdev.c:901
RIP: 0010:blkdev_put+0x562/0x8a0 block/bdev.c:901
Call Trace:
<TASK>
release_journal_dev fs/reiserfs/journal.c:2592 [inline]
free_journal_ram+0x421/0x5c0 fs/reiserfs/journal.c:1896
do_journal_release fs/reiserfs/journal.c:1960 [inline]
journal_release+0x276/0x630 fs/reiserfs/journal.c:1971
reiserfs_put_super+0xe4/0x5c0 fs/reiserfs/super.c:616
generic_shutdown_super+0x158/0x480 fs/super.c:499
kill_block_super+0x64/0xb0 fs/super.c:1422
deactivate_locked_super+0x98/0x160 fs/super.c:330
deactivate_super+0xb1/0xd0 fs/super.c:361
cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1247
task_work_run+0x16f/0x270 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xadc/0x2a30 kernel/exit.c:874
do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
__do_sys_exit_group kernel/exit.c:1035 [inline]
__se_sys_exit_group kernel/exit.c:1033 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Fix this problem by passing in NULL holder in this case.
Reported-by: syzbot+04625c80899f4555de39@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=04625c80899f4555de39
Fixes: 2736e8eeb0cc ("block: use the holder as indication for exclusive opens")
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230620111322.1014775-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
|
Provide helpers to set and clear sb->s_readonly_remount including
appropriate memory barriers. Also use this opportunity to document what
the barriers pair with and why they are needed.
Suggested-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Message-Id: <20230620112832.5158-1-jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
|
In a syzbot stress test that deliberately causes file system errors on
nilfs2 with a corrupted disk image, it has been reported that
nilfs_clear_dirty_page() called from nilfs_clear_dirty_pages() can cause a
general protection fault.
In nilfs_clear_dirty_pages(), when looking up dirty pages from the page
cache and calling nilfs_clear_dirty_page() for each dirty page/folio
retrieved, the back reference from the argument page to "mapping" may have
been changed to NULL (and possibly others). It is necessary to check this
after locking the page/folio.
So, fix this issue by not calling nilfs_clear_dirty_page() on a page/folio
after locking it in nilfs_clear_dirty_pages() if the back reference
"mapping" from the page/folio is different from the "mapping" that held
the page/folio just before.
Link: https://lkml.kernel.org/r/20230612021456.3682-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+53369d11851d8f26735c@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/000000000000da4f6b05eb9bf593@google.com
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Patch series "revert shrinker_srcu related changes".
This patch (of 7):
This reverts commit cf2e309ebca7bb0916771839f9b580b06c778530.
Kernel test robot reports -88.8% regression in stress-ng.ramfs.ops_per_sec
test case [1], which is caused by commit f95bdb700bc6 ("mm: vmscan: make
global slab shrink lockless"). The root cause is that SRCU has to be
careful to not frequently check for SRCU read-side critical section exits.
Therefore, even if no one is currently in the SRCU read-side critical
section, synchronize_srcu() cannot return quickly. That's why
unregister_shrinker() has become slower.
After discussion, we will try to use the refcount+RCU method [2] proposed
by Dave Chinner to continue to re-implement the lockless slab shrink. So
revert the shrinker_mutex back to shrinker_rwsem first.
[1]. https://lore.kernel.org/lkml/202305230837.db2c233f-yujie.liu@intel.com/
[2]. https://lore.kernel.org/lkml/ZIJhou1d55d4H1s0@dread.disaster.area/
Link: https://lkml.kernel.org/r/20230609081518.3039120-1-qi.zheng@linux.dev
Link: https://lkml.kernel.org/r/20230609081518.3039120-2-qi.zheng@linux.dev
Reported-by: kernel test robot <yujie.liu@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202305230837.db2c233f-yujie.liu@intel.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Kirill Tkhai <tkhai@ya.ru>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yujie Liu <yujie.liu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
As a result of analysis of a syzbot report, it turned out that in three
cases where nilfs2 allocates block device buffers directly via sb_getblk,
concurrent reads to the device can corrupt the allocated buffers.
Nilfs2 uses sb_getblk for segment summary blocks, that make up a log
header, and the super root block, that is the trailer, and when moving and
writing the second super block after fs resize.
In any of these, since the uptodate flag is not set when storing metadata
to be written in the allocated buffers, the stored metadata will be
overwritten if a device read of the same block occurs concurrently before
the write. This causes metadata corruption and misbehavior in the log
write itself, causing warnings in nilfs_btree_assign() as reported.
Fix these issues by setting an uptodate flag on the buffer head on the
first or before modifying each buffer obtained with sb_getblk, and
clearing the flag on failure.
When setting the uptodate flag, the lock_buffer/unlock_buffer pair is used
to perform necessary exclusive control, and the buffer is filled to ensure
that uninitialized bytes are not mixed into the data read from others. As
for buffers for segment summary blocks, they are filled incrementally, so
if the uptodate flag was unset on their allocation, set the flag and zero
fill the buffer once at that point.
Also, regarding the superblock move routine, the starting point of the
memset call to zerofill the block is incorrectly specified, which can
cause a buffer overflow on file systems with block sizes greater than
4KiB. In addition, if the superblock is moved within a large block, it is
necessary to assume the possibility that the data in the superblock will
be destroyed by zero-filling before copying. So fix these potential
issues as well.
Link: https://lkml.kernel.org/r/20230609035732.20426-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+31837fe952932efc8fb9@syzkaller.appspotmail.com
Closes: https://lkml.kernel.org/r/00000000000030000a05e981f475@google.com
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
If we disable quotas while we have a relocation of a metadata block group
that has extents belonging to the quota root, we can cause the relocation
to fail with -ENOENT. This is because relocation builds backref nodes for
extents of the quota root and later needs to walk the backrefs and access
the quota root - however if in between a task disables quotas, it results
in deleting the quota root from the root tree (with btrfs_del_root(),
called from btrfs_quota_disable().
This can be sporadically triggered by test case btrfs/255 from fstests:
$ ./check btrfs/255
FSTYP -- btrfs
PLATFORM -- Linux/x86_64 debian0 6.4.0-rc6-btrfs-next-134+ #1 SMP PREEMPT_DYNAMIC Thu Jun 15 11:59:28 WEST 2023
MKFS_OPTIONS -- /dev/sdc
MOUNT_OPTIONS -- /dev/sdc /home/fdmanana/btrfs-tests/scratch_1
btrfs/255 6s ... _check_dmesg: something found in dmesg (see /home/fdmanana/git/hub/xfstests/results//btrfs/255.dmesg)
- output mismatch (see /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad)
--- tests/btrfs/255.out 2023-03-02 21:47:53.876609426 +0000
+++ /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad 2023-06-16 10:20:39.267563212 +0100
@@ -1,2 +1,4 @@
QA output created by 255
+ERROR: error during balancing '/home/fdmanana/btrfs-tests/scratch_1': No such file or directory
+There may be more info in syslog - try dmesg | tail
Silence is golden
...
(Run 'diff -u /home/fdmanana/git/hub/xfstests/tests/btrfs/255.out /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad' to see the entire diff)
Ran: btrfs/255
Failures: btrfs/255
Failed 1 of 1 tests
To fix this make the quota disable operation take the cleaner mutex, as
relocation of a block group also takes this mutex. This is also what we
do when deleting a subvolume/snapshot, we take the cleaner mutex in the
cleaner kthread (at cleaner_kthread()) and then we call btrfs_del_root()
at btrfs_drop_snapshot() while under the protection of the cleaner mutex.
Fixes: bed92eae26cc ("Btrfs: qgroup implementation and prototypes")
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
Add a comment to struct btrfs_fs_info::dirty_cowonly_roots to mention
that struct btrfs_fs_info::trans_lock is the lock that protects that
list.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
When deleting the free space tree we are deleting the free space root
from the list fs_info->dirty_cowonly_roots without taking the lock that
protects it, which is struct btrfs_fs_info::trans_lock.
This unsynchronized list manipulation may cause chaos if there's another
concurrent manipulation of this list, such as when adding a root to it
with ctree.c:add_root_to_dirty_list().
This can result in all sorts of weird failures caused by a race, such as
the following crash:
[337571.278245] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] PREEMPT SMP PTI
[337571.278933] CPU: 1 PID: 115447 Comm: btrfs Tainted: G W 6.4.0-rc6-btrfs-next-134+ #1
[337571.279153] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
[337571.279572] RIP: 0010:commit_cowonly_roots+0x11f/0x250 [btrfs]
[337571.279928] Code: 85 38 06 00 (...)
[337571.280363] RSP: 0018:ffff9f63446efba0 EFLAGS: 00010206
[337571.280582] RAX: ffff942d98ec2638 RBX: ffff9430b82b4c30 RCX: 0000000449e1c000
[337571.280798] RDX: dead000000000100 RSI: ffff9430021e4900 RDI: 0000000000036070
[337571.281015] RBP: ffff942d98ec2000 R08: ffff942d98ec2000 R09: 000000000000015b
[337571.281254] R10: 0000000000000009 R11: 0000000000000001 R12: ffff942fe8fbf600
[337571.281476] R13: ffff942dabe23040 R14: ffff942dabe20800 R15: ffff942d92cf3b48
[337571.281723] FS: 00007f478adb7340(0000) GS:ffff94349fa40000(0000) knlGS:0000000000000000
[337571.281950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[337571.282184] CR2: 00007f478ab9a3d5 CR3: 000000001e02c001 CR4: 0000000000370ee0
[337571.282416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[337571.282647] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[337571.282874] Call Trace:
[337571.283101] <TASK>
[337571.283327] ? __die_body+0x1b/0x60
[337571.283570] ? die_addr+0x39/0x60
[337571.283796] ? exc_general_protection+0x22e/0x430
[337571.284022] ? asm_exc_general_protection+0x22/0x30
[337571.284251] ? commit_cowonly_roots+0x11f/0x250 [btrfs]
[337571.284531] btrfs_commit_transaction+0x42e/0xf90 [btrfs]
[337571.284803] ? _raw_spin_unlock+0x15/0x30
[337571.285031] ? release_extent_buffer+0x103/0x130 [btrfs]
[337571.285305] reset_balance_state+0x152/0x1b0 [btrfs]
[337571.285578] btrfs_balance+0xa50/0x11e0 [btrfs]
[337571.285864] ? __kmem_cache_alloc_node+0x14a/0x410
[337571.286086] btrfs_ioctl+0x249a/0x3320 [btrfs]
[337571.286358] ? mod_objcg_state+0xd2/0x360
[337571.286577] ? refill_obj_stock+0xb0/0x160
[337571.286798] ? seq_release+0x25/0x30
[337571.287016] ? __rseq_handle_notify_resume+0x3ba/0x4b0
[337571.287235] ? percpu_counter_add_batch+0x2e/0xa0
[337571.287455] ? __x64_sys_ioctl+0x88/0xc0
[337571.287675] __x64_sys_ioctl+0x88/0xc0
[337571.287901] do_syscall_64+0x38/0x90
[337571.288126] entry_SYSCALL_64_after_hwframe+0x72/0xdc
[337571.288352] RIP: 0033:0x7f478aaffe9b
So fix this by locking struct btrfs_fs_info::trans_lock before deleting
the free space root from that list.
Fixes: a5ed91828518 ("Btrfs: implement the free space B-tree")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
When disabling quotas we are deleting the quota root from the list
fs_info->dirty_cowonly_roots without taking the lock that protects it,
which is struct btrfs_fs_info::trans_lock. This unsynchronized list
manipulation may cause chaos if there's another concurrent manipulation
of this list, such as when adding a root to it with
ctree.c:add_root_to_dirty_list().
This can result in all sorts of weird failures caused by a race, such as
the following crash:
[337571.278245] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] PREEMPT SMP PTI
[337571.278933] CPU: 1 PID: 115447 Comm: btrfs Tainted: G W 6.4.0-rc6-btrfs-next-134+ #1
[337571.279153] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
[337571.279572] RIP: 0010:commit_cowonly_roots+0x11f/0x250 [btrfs]
[337571.279928] Code: 85 38 06 00 (...)
[337571.280363] RSP: 0018:ffff9f63446efba0 EFLAGS: 00010206
[337571.280582] RAX: ffff942d98ec2638 RBX: ffff9430b82b4c30 RCX: 0000000449e1c000
[337571.280798] RDX: dead000000000100 RSI: ffff9430021e4900 RDI: 0000000000036070
[337571.281015] RBP: ffff942d98ec2000 R08: ffff942d98ec2000 R09: 000000000000015b
[337571.281254] R10: 0000000000000009 R11: 0000000000000001 R12: ffff942fe8fbf600
[337571.281476] R13: ffff942dabe23040 R14: ffff942dabe20800 R15: ffff942d92cf3b48
[337571.281723] FS: 00007f478adb7340(0000) GS:ffff94349fa40000(0000) knlGS:0000000000000000
[337571.281950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[337571.282184] CR2: 00007f478ab9a3d5 CR3: 000000001e02c001 CR4: 0000000000370ee0
[337571.282416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[337571.282647] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[337571.282874] Call Trace:
[337571.283101] <TASK>
[337571.283327] ? __die_body+0x1b/0x60
[337571.283570] ? die_addr+0x39/0x60
[337571.283796] ? exc_general_protection+0x22e/0x430
[337571.284022] ? asm_exc_general_protection+0x22/0x30
[337571.284251] ? commit_cowonly_roots+0x11f/0x250 [btrfs]
[337571.284531] btrfs_commit_transaction+0x42e/0xf90 [btrfs]
[337571.284803] ? _raw_spin_unlock+0x15/0x30
[337571.285031] ? release_extent_buffer+0x103/0x130 [btrfs]
[337571.285305] reset_balance_state+0x152/0x1b0 [btrfs]
[337571.285578] btrfs_balance+0xa50/0x11e0 [btrfs]
[337571.285864] ? __kmem_cache_alloc_node+0x14a/0x410
[337571.286086] btrfs_ioctl+0x249a/0x3320 [btrfs]
[337571.286358] ? mod_objcg_state+0xd2/0x360
[337571.286577] ? refill_obj_stock+0xb0/0x160
[337571.286798] ? seq_release+0x25/0x30
[337571.287016] ? __rseq_handle_notify_resume+0x3ba/0x4b0
[337571.287235] ? percpu_counter_add_batch+0x2e/0xa0
[337571.287455] ? __x64_sys_ioctl+0x88/0xc0
[337571.287675] __x64_sys_ioctl+0x88/0xc0
[337571.287901] do_syscall_64+0x38/0x90
[337571.288126] entry_SYSCALL_64_after_hwframe+0x72/0xdc
[337571.288352] RIP: 0033:0x7f478aaffe9b
So fix this by locking struct btrfs_fs_info::trans_lock before deleting
the quota root from that list.
Fixes: bed92eae26cc ("Btrfs: qgroup implementation and prototypes")
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
The btrfs_inode_mod_outstanding_extents trace event only shows the modified
number to the number of outstanding extents. It would be helpful if we can
see the resulting extent number as well.
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
|
|
Overlayfs creates the real underlying files with fake f_path, whose
f_inode is on the underlying fs and f_path on overlayfs.
Those real files were open with FMODE_NONOTIFY, because fsnotify code was
not prapared to handle fsnotify hooks on files with fake path correctly
and fanotify would report unexpected event->fd with fake overlayfs path,
when the underlying fs was being watched.
Teach fsnotify to handle events on the real files, and do not set real
files to FMODE_NONOTIFY to allow operations on real file (e.g. open,
access, modify, close) to generate async and permission events.
Because fsnotify does not have notifications on address space
operations, we do not need to worry about ->vm_file not reporting
events to a watched overlayfs when users are accessing a mapped
overlayfs file.
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Message-Id: <20230615112229.2143178-6-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
|
Overlayfs uses open_with_fake_path() to allocate internal kernel files,
with a "fake" path - whose f_path is not on the same fs as f_inode.
Allocate a container struct backing_file for those internal files, that
is used to hold the "fake" ovl path along with the real path.
backing_file_real_path() can be used to access the stored real path.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Message-Id: <20230615112229.2143178-5-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
|
|
Use a common helper init_file() instead of __alloc_file() for
alloc_empty_file*() helpers and improrve the documentation.
This is needed for a follow up patch that allocates a backing_file
container.
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Message-Id: <20230615112229.2143178-4-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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cachefiles uses kernel_open_tmpfile() to open kernel internal tmpfile
without accounting for nr_files.
cachefiles uses open_with_fake_path() for the same reason without the
need for a fake path.
Fork open_with_fake_path() to kernel_file_open() which only does the
noaccount part and use it in cachefiles.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Message-Id: <20230615112229.2143178-3-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Overlayfs and cachefiles use vfs_open_tmpfile() to open a tmpfile
without accounting for nr_files.
Rename this helper to kernel_tmpfile_open() to better reflect this
helper is used for kernel internal users.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Message-Id: <20230615112229.2143178-2-amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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When updating the ctime, we also want to update i_version.
This is just something I noticed by inspection. There is probably no way
to test this today unless you can somehow get to this inode via nfsd.
Still, I think it's the right thing to do for consistency's sake.
David Sterba's comment: I don't see anything wrong with setting the
iversion bit, however I also don't see where this would be useful.
Agreed with the consistency, otherwise the time is updated when device
super block is wiped or a device initialized, both are big events so
missing that due to lack of iversion update seems unlikely. I'll add it
to the queue, thanks.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
[ add comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
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The 'btrfs_compressed_bioset' struct isn't exported outside of the
fs/btrfs/compression.c file, so make it static to fix the following
sparse warning:
fs/btrfs/compression.c:40:16: warning: symbol 'btrfs_compressed_bioset' was not declared. Should it be static?
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Commit acc8d8588cb7 converted afs_writepages_region() to write back a
folio batch. The function waits for writeback to a folio, but then
proceeds to the rest of the batch without trying to write that folio
again. This patch fixes has it attempt to write the folio again.
[DH: Also remove an 'else' that adding a goto makes redundant]
Fixes: acc8d8588cb7 ("afs: convert afs_writepages_region() to use filemap_get_folios_tag()")
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/20230607204120.89416-2-vishal.moola@gmail.com/
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Commit acc8d8588cb7 converted afs_writepages_region() to write back a
folio batch. If writeback needs rescheduling, the function exits without
dropping the references to the folios in fbatch. This patch fixes that.
[DH: Moved the added line before the _leave()]
Fixes: acc8d8588cb7 ("afs: convert afs_writepages_region() to use filemap_get_folios_tag()")
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/20230607204120.89416-1-vishal.moola@gmail.com/
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Callers of `btrfs_reduce_alloc_profile` expect it to return exactly
one allocation profile flag, and failing to do so may ultimately
result in a WARN_ON and remount-ro when allocating new blocks, like
the below transaction abort on 6.1.
`btrfs_reduce_alloc_profile` has two ways of determining the profile,
first it checks if a conversion balance is currently running and
uses the profile we're converting to. If no balance is currently
running, it returns the max-redundancy profile which at least one
block in the selected block group has.
This works by simply checking each known allocation profile bit in
redundancy order. However, `btrfs_reduce_alloc_profile` has not been
updated as new flags have been added - first with the `DUP` profile
and later with the RAID1C34 profiles.
Because of the way it checks, if we have blocks with different
profiles and at least one is known, that profile will be selected.
However, if none are known we may return a flag set with multiple
allocation profiles set.
This is currently only possible when a balance from one of the three
unhandled profiles to another of the unhandled profiles is canceled
after allocating at least one block using the new profile.
In that case, a transaction abort like the below will occur and the
filesystem will need to be mounted with -o skip_balance to get it
mounted rw again (but the balance cannot be resumed without a
similar abort).
[770.648] ------------[ cut here ]------------
[770.648] BTRFS: Transaction aborted (error -22)
[770.648] WARNING: CPU: 43 PID: 1159593 at fs/btrfs/extent-tree.c:4122 find_free_extent+0x1d94/0x1e00 [btrfs]
[770.648] CPU: 43 PID: 1159593 Comm: btrfs Tainted: G W 6.1.0-0.deb11.7-powerpc64le #1 Debian 6.1.20-2~bpo11+1a~test
[770.648] Hardware name: T2P9D01 REV 1.00 POWER9 0x4e1202 opal:skiboot-bc106a0 PowerNV
[770.648] NIP: c00800000f6784fc LR: c00800000f6784f8 CTR: c000000000d746c0
[770.648] REGS: c000200089afe9a0 TRAP: 0700 Tainted: G W (6.1.0-0.deb11.7-powerpc64le Debian 6.1.20-2~bpo11+1a~test)
[770.648] MSR: 9000000002029033 <SF,HV,VEC,EE,ME,IR,DR,RI,LE> CR: 28848282 XER: 20040000
[770.648] CFAR: c000000000135110 IRQMASK: 0
GPR00: c00800000f6784f8 c000200089afec40 c00800000f7ea800 0000000000000026
GPR04: 00000001004820c2 c000200089afea00 c000200089afe9f8 0000000000000027
GPR08: c000200ffbfe7f98 c000000002127f90 ffffffffffffffd8 0000000026d6a6e8
GPR12: 0000000028848282 c000200fff7f3800 5deadbeef0000122 c00000002269d000
GPR16: c0002008c7797c40 c000200089afef17 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000001 c000200008bc5a98 0000000000000001
GPR24: 0000000000000000 c0000003c73088d0 c000200089afef17 c000000016d3a800
GPR28: c0000003c7308800 c00000002269d000 ffffffffffffffea 0000000000000001
[770.648] NIP [c00800000f6784fc] find_free_extent+0x1d94/0x1e00 [btrfs]
[770.648] LR [c00800000f6784f8] find_free_extent+0x1d90/0x1e00 [btrfs]
[770.648] Call Trace:
[770.648] [c000200089afec40] [c00800000f6784f8] find_free_extent+0x1d90/0x1e00 [btrfs] (unreliable)
[770.648] [c000200089afed30] [c00800000f681398] btrfs_reserve_extent+0x1a0/0x2f0 [btrfs]
[770.648] [c000200089afeea0] [c00800000f681bf0] btrfs_alloc_tree_block+0x108/0x670 [btrfs]
[770.648] [c000200089afeff0] [c00800000f66bd68] __btrfs_cow_block+0x170/0x850 [btrfs]
[770.648] [c000200089aff100] [c00800000f66c58c] btrfs_cow_block+0x144/0x288 [btrfs]
[770.648] [c000200089aff1b0] [c00800000f67113c] btrfs_search_slot+0x6b4/0xcb0 [btrfs]
[770.648] [c000200089aff2a0] [c00800000f679f60] lookup_inline_extent_backref+0x128/0x7c0 [btrfs]
[770.648] [c000200089aff3b0] [c00800000f67b338] lookup_extent_backref+0x70/0x190 [btrfs]
[770.648] [c000200089aff470] [c00800000f67b54c] __btrfs_free_extent+0xf4/0x1490 [btrfs]
[770.648] [c000200089aff5a0] [c00800000f67d770] __btrfs_run_delayed_refs+0x328/0x1530 [btrfs]
[770.648] [c000200089aff740] [c00800000f67ea2c] btrfs_run_delayed_refs+0xb4/0x3e0 [btrfs]
[770.648] [c000200089aff800] [c00800000f699aa4] btrfs_commit_transaction+0x8c/0x12b0 [btrfs]
[770.648] [c000200089aff8f0] [c00800000f6dc628] reset_balance_state+0x1c0/0x290 [btrfs]
[770.648] [c000200089aff9a0] [c00800000f6e2f7c] btrfs_balance+0x1164/0x1500 [btrfs]
[770.648] [c000200089affb40] [c00800000f6f8e4c] btrfs_ioctl+0x2b54/0x3100 [btrfs]
[770.648] [c000200089affc80] [c00000000053be14] sys_ioctl+0x794/0x1310
[770.648] [c000200089affd70] [c00000000002af98] system_call_exception+0x138/0x250
[770.648] [c000200089affe10] [c00000000000c654] system_call_common+0xf4/0x258
[770.648] --- interrupt: c00 at 0x7fff94126800
[770.648] NIP: 00007fff94126800 LR: 0000000107e0b594 CTR: 0000000000000000
[770.648] REGS: c000200089affe80 TRAP: 0c00 Tainted: G W (6.1.0-0.deb11.7-powerpc64le Debian 6.1.20-2~bpo11+1a~test)
[770.648] MSR: 900000000000d033 <SF,HV,EE,PR,ME,IR,DR,RI,LE> CR: 24002848 XER: 00000000
[770.648] IRQMASK: 0
GPR00: 0000000000000036 00007fffc9439da0 00007fff94217100 0000000000000003
GPR04: 00000000c4009420 00007fffc9439ee8 0000000000000000 0000000000000000
GPR08: 00000000803c7416 0000000000000000 0000000000000000 0000000000000000
GPR12: 0000000000000000 00007fff9467d120 0000000107e64c9c 0000000107e64d0a
GPR16: 0000000107e64d06 0000000107e64cf1 0000000107e64cc4 0000000107e64c73
GPR20: 0000000107e64c31 0000000107e64bf1 0000000107e64be7 0000000000000000
GPR24: 0000000000000000 00007fffc9439ee0 0000000000000003 0000000000000001
GPR28: 00007fffc943f713 0000000000000000 00007fffc9439ee8 0000000000000000
[770.648] NIP [00007fff94126800] 0x7fff94126800
[770.648] LR [0000000107e0b594] 0x107e0b594
[770.648] --- interrupt: c00
[770.648] Instruction dump:
[770.648] 3b00ffe4 e8898828 481175f5 60000000 4bfff4fc 3be00000 4bfff570 3d220000
[770.648] 7fc4f378 e8698830 4811cd95 e8410018 <0fe00000> f9c10060 f9e10068 fa010070
[770.648] ---[ end trace 0000000000000000 ]---
[770.648] BTRFS: error (device dm-2: state A) in find_free_extent_update_loop:4122: errno=-22 unknown
[770.648] BTRFS info (device dm-2: state EA): forced readonly
[770.648] BTRFS: error (device dm-2: state EA) in __btrfs_free_extent:3070: errno=-22 unknown
[770.648] BTRFS error (device dm-2: state EA): failed to run delayed ref for logical 17838685708288 num_bytes 24576 type 184 action 2 ref_mod 1: -22
[770.648] BTRFS: error (device dm-2: state EA) in btrfs_run_delayed_refs:2144: errno=-22 unknown
[770.648] BTRFS: error (device dm-2: state EA) in reset_balance_state:3599: errno=-22 unknown
Fixes: 47e6f7423b91 ("btrfs: add support for 3-copy replication (raid1c3)")
Fixes: 8d6fac0087e5 ("btrfs: add support for 4-copy replication (raid1c4)")
CC: stable@vger.kernel.org # 5.10+
Signed-off-by: Matt Corallo <blnxfsl@bluematt.me>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Since the scrub rework introduced by commit 2af2aaf98205 ("btrfs:
scrub: introduce structure for new BTRFS_STRIPE_LEN based interface")
and later commits, scrub only needs one single workqueue,
fs_info::scrub_worker.
That scrub_wr_completion_workers is initially to handle the delay work
after write bios finished. But the new scrub code goes submit-and-wait
for write bios, thus all the work are done inside the scrub_worker.
The last user of fs_info::scrub_wr_completion_workers is removed in
commit 16f93993498b ("btrfs: scrub: remove the old writeback
infrastructure"), so we can safely remove the workqueue.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Since the rework of scrub introduced by commit 2af2aaf98205 ("btrfs:
scrub: introduce structure for new BTRFS_STRIPE_LEN based interface")
and later commits, scrub no longer keeps its data checksum inside sctx.
Instead we have scrub_stripe::csums for the checksum of the stripe.
Thus we can remove the unused scrub_ctx::csum_list member.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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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>
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