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Darrick J. Wong 549f2fc321 xfs: don't drop errno values when we fail to ficlone the entire range 
commit 7ce31f20a0 upstream.

Way back when we first implemented FICLONE for XFS, life was simple --
either the the entire remapping completed, or something happened and we
had to return an errno explaining what happened.  Neither of those
ioctls support returning partial results, so it's all or nothing.

Then things got complicated when copy_file_range came along, because it
actually can return the number of bytes copied, so commit 3f68c1f562
tried to make it so that we could return a partial result if the
REMAP_FILE_CAN_SHORTEN flag is set.  This is also how FIDEDUPERANGE can
indicate that the kernel performed a partial deduplication.

Unfortunately, the logic is wrong if an error stops the remapping and
CAN_SHORTEN is not set.  Because those callers cannot return partial
results, it is an error for ->remap_file_range to return a positive
quantity that is less than the @len passed in.  Implementations really
should be returning a negative errno in this case, because that's what
btrfs (which introduced FICLONE{,RANGE}) did.

Therefore, ->remap_range implementations cannot silently drop an errno
that they might have when the number of bytes remapped is less than the
number of bytes requested and CAN_SHORTEN is not set.

Found by running generic/562 on a 64k fsblock filesystem and wondering
why it reported corrupt files.

Cc: <stable@vger.kernel.org> # v4.20
Fixes: 3fc9f5e409 ("xfs: remove xfs_reflink_remap_range")
Really-Fixes: 3f68c1f562 ("xfs: support returning partial reflink results")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-19 18:11:24 +01:00
arch riscv: Fix IPIs usage in kfence_protect_page() 2024-12-19 18:11:22 +01:00
block blk-cgroup: Fix UAF in blkcg_unpin_online() 2024-12-19 18:11:22 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY 2024-12-09 10:31:48 +01:00
Documentation PCI: Add 'reset_subordinate' to reset hierarchy below bridge 2024-12-14 20:00:14 +01:00
drivers drm/i915: Fix NULL pointer dereference in capture_engine 2024-12-19 18:11:24 +01:00
fs xfs: don't drop errno values when we fail to ficlone the entire range 2024-12-19 18:11:24 +01:00
include ALSA: usb-audio: Update UMP group attributes for GTB blocks, too 2024-12-14 20:00:23 +01:00
init Compiler Attributes: disable __counted_by for clang < 19.1.3 2024-12-09 10:32:46 +01:00
io_uring io_uring/tctx: work around xa_store() allocation error issue 2024-12-14 20:00:17 +01:00
ipc ipc: fix memleak if msg_init_ns failed in create_ipc_ns 2024-12-09 10:32:54 +01:00
kernel bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors 2024-12-19 18:11:21 +01:00
lib lib: stackinit: hide never-taken branch from compiler 2024-12-14 19:59:57 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/damon/vaddr: fix issue in damon_va_evenly_split_region() 2024-12-14 20:00:21 +01:00
net tcp: check space before adding MPTCP SYN options 2024-12-19 18:11:21 +01:00
rust rust: macros: fix documentation of the paste! macro 2024-12-09 10:32:25 +01:00
samples samples/bpf: Fix a resource leak 2024-12-14 20:00:03 +01:00
scripts setlocalversion: work around "git describe" performance 2024-12-14 20:00:17 +01:00
security apparmor: test: Fix memory leak for aa_unpack_strdup() 2024-12-09 10:32:45 +01:00
sound ALSA: usb-audio: Add implicit feedback quirk for Yamaha THR5 2024-12-19 18:11:22 +01:00
tools selftests/ftrace: adjust offset for kprobe syntax error test 2024-12-14 20:00:21 +01:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS membarrier: riscv: Add full memory barrier in switch_mm() 2024-09-12 11:11:45 +02:00
Makefile Linux 6.6.66 2024-12-14 20:00:23 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.