Re: [PATCH 2/2] netfs: Fix missing zero-length check in unbuffered write

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


David Howells wrote on Mon, Jan 29, 2024 at 09:49:19AM +0000:
> Fix netfs_unbuffered_write_iter() to return immediately if
> generic_write_checks() returns 0, indicating there's nothing to write.
> Note that netfs_file_write_iter() already does this.
> Also, whilst we're at it, put in checks for the size being zero before we
> even take the locks.  Note that generic_write_checks() can still reduce the
> size to zero, so we still need that check.
> Without this, a warning similar to the following is logged to dmesg:
> 	netfs: Zero-sized write [R=1b6da]
> and the syscall fails with EIO, e.g.:
> 	/sbin/ldconfig.real: Writing of cache extension data failed: Input/output error
> This can be reproduced on 9p by:
> 	xfs_io -f -c 'pwrite 0 0' /xfstest.test/foo
> Fixes: 153a9961b551 ("netfs: Implement unbuffered/DIO write support")
> Reported-by: Eric Van Hensbergen <ericvh@xxxxxxxxxx>
> Link:
> Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
> cc: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>


Tested-by: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>

Dominique Martinet | Asmadeus

[Index of Archives]     [CEPH Users]     [Ceph Large]     [Ceph Dev]     [Information on CEPH]     [Linux BTRFS]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux