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Ye Bin adf490083c ext4: fix warning in ext4_handle_inode_extension commit `f4534c9fc9` upstream. We got issue as follows: EXT4-fs error (device loop0) in ext4_reserve_inode_write:5741: Out of memory EXT4-fs error (device loop0): ext4_setattr:5462: inode #13: comm syz-executor.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_setattr:5519: Out of memory EXT4-fs error (device loop0): ext4_ind_map_blocks:595: inode #13: comm syz-executor.0: Can't allocate blocks for non-extent mapped inodes with bigalloc ------------[ cut here ]------------ WARNING: CPU: 1 PID: 4361 at fs/ext4/file.c:301 ext4_file_write_iter+0x11c9/0x1220 Modules linked in: CPU: 1 PID: 4361 Comm: syz-executor.0 Not tainted 5.10.0+ #1 RIP: 0010:ext4_file_write_iter+0x11c9/0x1220 RSP: 0018:ffff924d80b27c00 EFLAGS: 00010282 RAX: ffffffff815a3379 RBX: 0000000000000000 RCX: 000000003b000000 RDX: ffff924d81601000 RSI: 00000000000009cc RDI: 00000000000009cd RBP: 000000000000000d R08: ffffffffbc5a2c6b R09: 0000902e0e52a96f R10: ffff902e2b7c1b40 R11: ffff902e2b7c1b40 R12: 000000000000000a R13: 0000000000000001 R14: ffff902e0e52aa10 R15: ffffffffffffff8b FS: 00007f81a7f65700(0000) GS:ffff902e3bc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 000000012db88001 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_iter_readv_writev+0x2e5/0x360 do_iter_write+0x112/0x4c0 do_pwritev+0x1e5/0x390 __x64_sys_pwritev2+0x7e/0xa0 do_syscall_64+0x37/0x50 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Above issue may happen as follows: Assume inode.i_size=4096 EXT4_I(inode)->i_disksize=4096 step 1: set inode->i_isize = 8192 ext4_setattr if (attr->ia_size != inode->i_size) EXT4_I(inode)->i_disksize = attr->ia_size; rc = ext4_mark_inode_dirty ext4_reserve_inode_write ext4_get_inode_loc __ext4_get_inode_loc sb_getblk --> return -ENOMEM ... if (!error) ->will not update i_size i_size_write(inode, attr->ia_size); Now: inode.i_size=4096 EXT4_I(inode)->i_disksize=8192 step 2: Direct write 4096 bytes ext4_file_write_iter ext4_dio_write_iter iomap_dio_rw ->return error if (extend) ext4_handle_inode_extension WARN_ON_ONCE(i_size_read(inode) < EXT4_I(inode)->i_disksize); ->Then trigger warning. To solve above issue, if mark inode dirty failed in ext4_setattr just set 'EXT4_I(inode)->i_disksize' with old value. Signed-off-by: Ye Bin <yebin10@huawei.com> Link: https://lore.kernel.org/r/20220326065351.761952-1-yebin10@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-06-09 10:21:22 +02:00
arch	powerpc/fsl_rio: Fix refcount leak in fsl_rio_setup	2022-06-09 10:21:18 +02:00
block	bfq: Track whether bfq_group is still online	2022-06-09 10:21:22 +02:00
certs	certs: Trigger creation of RSA module signing key if it's not an RSA key	2021-09-15 09:50:29 +02:00
crypto	crypto: cryptd - Protect per-CPU resource by disabling BH.	2022-06-09 10:21:17 +02:00
Documentation	spi: qcom-qspi: Add minItems to interconnect-names	2022-06-09 10:20:59 +02:00
drivers	iwlwifi: mvm: fix assert 1F04 upon reconfig	2022-06-09 10:21:22 +02:00
fs	ext4: fix warning in ext4_handle_inode_extension	2022-06-09 10:21:22 +02:00
include	mailbox: forward the hrtimer if not queued and under a lock	2022-06-09 10:21:18 +02:00
init	random: handle latent entropy and command line from random_init()	2022-05-30 09:33:44 +02:00
ipc	ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()	2022-06-09 10:21:17 +02:00
kernel	sched/fair: Fix cfs_rq_clock_pelt() for throttled cfs_rq	2022-06-09 10:21:02 +02:00
lib	lib/crypto: add prompts back to crypto libraries	2022-06-06 08:42:42 +02:00
LICENSES	LICENSES/deprecated: add Zlib license text	2020-09-16 14:33:49 +02:00
mm	zsmalloc: fix races between asynchronous zspage free and page migration	2022-06-06 08:42:43 +02:00
net	wifi: mac80211: fix use-after-free in chanctx code	2022-06-09 10:21:22 +02:00
samples	samples/bpf, xdpsock: Fix race when running for fix duration of time	2022-04-08 14:40:21 +02:00
scripts	scripts/faddr2line: Fix overlapping text section failures	2022-06-09 10:21:08 +02:00
security	efi: Do not import certificates from UEFI Secure Boot for T2 Macs	2022-06-09 10:21:22 +02:00
sound	ASoC: atmel-classd: Remove endianness flag on class d component	2022-06-09 10:21:16 +02:00
tools	perf jevents: Fix event syntax error caused by ExtSel	2022-06-09 10:21:21 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	KVM: Prevent module exit until all VMs are freed	2022-04-08 14:40:38 +02:00
.clang-format	RDMA 5.10 pull request	2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap	mailmap: add two more addresses of Uwe Kleine-König	2020-12-06 10:19:07 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Jason Cooper to CREDITS	2020-11-30 10:20:34 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: add git tree for random.c	2022-05-30 09:33:24 +02:00
Makefile	Linux 5.10.120	2022-06-06 08:42:45 +02:00
README

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.