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Open Source and information security mailing list archives
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Date: Sun, 2 Oct 2022 05:00:56 +0800
From: kernel test robot <lkp@...el.com>
To: Jeff Layton <jlayton@...nel.org>, tytso@....edu,
adilger.kernel@...ger.ca, djwong@...nel.org, david@...morbit.com,
trondmy@...merspace.com, neilb@...e.de, viro@...iv.linux.org.uk,
zohar@...ux.ibm.com, xiubli@...hat.com, chuck.lever@...cle.com,
lczerner@...hat.com, jack@...e.cz, bfields@...ldses.org,
brauner@...nel.org, fweimer@...hat.com
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-xfs@...r.kernel.org
Subject: Re: [PATCH v6 8/9] vfs: update times after copying data in
__generic_file_write_iter
Hi Jeff,
I love your patch! Perhaps something to improve:
[auto build test WARNING on next-20220929]
[cannot apply to tytso-ext4/dev trondmy-nfs/linux-next ceph-client/for-linus linus/master v6.0-rc7 v6.0-rc6 v6.0-rc5 v6.0-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Jeff-Layton/vfs-nfsd-clean-up-handling-of-i_version-counter/20220930-192844
base: 1c6c4f42b3de4f18ea96d62950d0e266ca35a055
config: i386-randconfig-a002
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/b305ff6981591917824b59e5ac7f833afea77ce6
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Jeff-Layton/vfs-nfsd-clean-up-handling-of-i_version-counter/20220930-192844
git checkout b305ff6981591917824b59e5ac7f833afea77ce6
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> mm/filemap.c:3892:65: warning: format specifies type 'long' but the argument has type 'ssize_t' (aka 'int') [-Wformat]
WARN_ONCE(err, "Failed to update m/ctime after write: %ld\n", err);
~~~ ^~~
%zd
include/asm-generic/bug.h:151:38: note: expanded from macro 'WARN_ONCE'
DO_ONCE_LITE_IF(condition, WARN, 1, format)
^~~~~~
include/linux/once_lite.h:31:9: note: expanded from macro 'DO_ONCE_LITE_IF'
func(__VA_ARGS__); \
^~~~~~~~~~~
include/asm-generic/bug.h:133:29: note: expanded from macro 'WARN'
__WARN_printf(TAINT_WARN, format); \
^~~~~~
include/asm-generic/bug.h:105:17: note: expanded from macro '__WARN_printf'
__warn_printk(arg); \
^~~
1 warning generated.
vim +3892 mm/filemap.c
3793
3794 /**
3795 * __generic_file_write_iter - write data to a file
3796 * @iocb: IO state structure (file, offset, etc.)
3797 * @from: iov_iter with data to write
3798 *
3799 * This function does all the work needed for actually writing data to a
3800 * file. It does all basic checks, removes SUID from the file, updates
3801 * modification times and calls proper subroutines depending on whether we
3802 * do direct IO or a standard buffered write.
3803 *
3804 * It expects i_rwsem to be grabbed unless we work on a block device or similar
3805 * object which does not need locking at all.
3806 *
3807 * This function does *not* take care of syncing data in case of O_SYNC write.
3808 * A caller has to handle it. This is mainly due to the fact that we want to
3809 * avoid syncing under i_rwsem.
3810 *
3811 * Return:
3812 * * number of bytes written, even for truncated writes
3813 * * negative error code if no data has been written at all
3814 */
3815 ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
3816 {
3817 struct file *file = iocb->ki_filp;
3818 struct address_space *mapping = file->f_mapping;
3819 struct inode *inode = mapping->host;
3820 ssize_t written = 0;
3821 ssize_t err;
3822 ssize_t status;
3823
3824 /* We can write back this queue in page reclaim */
3825 current->backing_dev_info = inode_to_bdi(inode);
3826 err = file_remove_privs(file);
3827 if (err)
3828 goto out;
3829
3830 if (iocb->ki_flags & IOCB_DIRECT) {
3831 loff_t pos, endbyte;
3832
3833 written = generic_file_direct_write(iocb, from);
3834 /*
3835 * If the write stopped short of completing, fall back to
3836 * buffered writes. Some filesystems do this for writes to
3837 * holes, for example. For DAX files, a buffered write will
3838 * not succeed (even if it did, DAX does not handle dirty
3839 * page-cache pages correctly).
3840 */
3841 if (written < 0 || !iov_iter_count(from) || IS_DAX(inode))
3842 goto out;
3843
3844 pos = iocb->ki_pos;
3845 status = generic_perform_write(iocb, from);
3846 /*
3847 * If generic_perform_write() returned a synchronous error
3848 * then we want to return the number of bytes which were
3849 * direct-written, or the error code if that was zero. Note
3850 * that this differs from normal direct-io semantics, which
3851 * will return -EFOO even if some bytes were written.
3852 */
3853 if (unlikely(status < 0)) {
3854 err = status;
3855 goto out;
3856 }
3857 /*
3858 * We need to ensure that the page cache pages are written to
3859 * disk and invalidated to preserve the expected O_DIRECT
3860 * semantics.
3861 */
3862 endbyte = pos + status - 1;
3863 err = filemap_write_and_wait_range(mapping, pos, endbyte);
3864 if (err == 0) {
3865 iocb->ki_pos = endbyte + 1;
3866 written += status;
3867 invalidate_mapping_pages(mapping,
3868 pos >> PAGE_SHIFT,
3869 endbyte >> PAGE_SHIFT);
3870 } else {
3871 /*
3872 * We don't know how much we wrote, so just return
3873 * the number of bytes which were direct-written
3874 */
3875 }
3876 } else {
3877 written = generic_perform_write(iocb, from);
3878 if (likely(written > 0))
3879 iocb->ki_pos += written;
3880 }
3881 out:
3882 if (written > 0) {
3883 err = file_update_time(file);
3884 /*
3885 * There isn't much we can do at this point if updating the
3886 * times fails after a successful write. The times and i_version
3887 * should still be updated in the inode, and it should still be
3888 * marked dirty, so hopefully the next inode update will catch it.
3889 * Log a warning once so we have a record that something untoward
3890 * has occurred.
3891 */
> 3892 WARN_ONCE(err, "Failed to update m/ctime after write: %ld\n", err);
3893 }
3894
3895 current->backing_dev_info = NULL;
3896 return written ? written : err;
3897 }
3898 EXPORT_SYMBOL(__generic_file_write_iter);
3899
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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