Damien Le Moal 5cefd8fea6 zonefs: Always invalidate last cached page on append write ... commit c1976bd8f2 upstream. When a direct append write is executed, the append offset may correspond to the last page of a sequential file inode which might have been cached already by buffered reads, page faults with mmap-read or non-direct readahead. To ensure that the on-disk and cached data is consistant for such last cached page, make sure to always invalidate it in zonefs_file_dio_append(). If the invalidation fails, return -EBUSY to userspace to differentiate from IO errors. This invalidation will always be a no-op when the FS block size (device zone write granularity) is equal to the page size (e.g. 4K). Reported-by: Hans Holmberg <Hans.Holmberg@wdc.com> Fixes: 02ef12a663 ("zonefs: use REQ_OP_ZONE_APPEND for sync DIO") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Tested-by: Hans Holmberg <hans.holmberg@wdc.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-04-06 12:12:42 +02:00
..
Kconfig	zonefs: select CONFIG_CRC32	2021-01-04 09:06:42 +09:00
Makefile	zonefs: Reorganize code	2023-04-06 12:12:23 +02:00
file.c	zonefs: Always invalidate last cached page on append write	2023-04-06 12:12:42 +02:00
super.c	zonefs: Separate zone information from inode information	2023-04-06 12:12:23 +02:00
sysfs.c	zonefs: Remove to_attr() helper function	2022-11-16 16:08:31 +09:00
trace.h	zonefs: Separate zone information from inode information	2023-04-06 12:12:23 +02:00
zonefs.h	zonefs: Separate zone information from inode information	2023-04-06 12:12:23 +02:00