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zonefs fixes for 5.6-rc4

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Two fixes in this pull request:
 * Revert the initial decision to silently ignore IOCB_NOWAIT for
   asynchronous direct IOs to sequential zone files. Instead, return an
   error to the user to signal that the feature is not supported (from
   Christoph)
 * A fix to zonefs Kconfig to select FS_IOMAP to avoid build failures if
   no other file system already selected this option (from Johannes).
 
 Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
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Merge tag 'zonefs-5.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs

Pull zonefs fixes from Damien Le Moal:
 "Two fixes in here:

   - Revert the initial decision to silently ignore IOCB_NOWAIT for
     asynchronous direct IOs to sequential zone files. Instead, return
     an error to the user to signal that the feature is not supported
     (from Christoph)

   - A fix to zonefs Kconfig to select FS_IOMAP to avoid build failures
     if no other file system already selected this option (from
     Johannes)"

* tag 'zonefs-5.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs:
  zonefs: select FS_IOMAP
  zonefs: fix IOCB_NOWAIT handling
This commit is contained in:
Linus Torvalds 2020-02-28 08:34:47 -08:00
commit bfeb4f9977
2 changed files with 5 additions and 4 deletions
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1
fs/zonefs/Kconfig
View file

@ -2,6 +2,7 @@ config ZONEFS_FS
tristate "zonefs filesystem support"
depends on BLOCK
depends on BLK_DEV_ZONED
select FS_IOMAP
help
zonefs is a simple file system which exposes zones of a zoned block
device (e.g. host-managed or host-aware SMR disk drives) as files.

8
fs/zonefs/super.c
View file

@ -601,13 +601,13 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret;
/*
* For async direct IOs to sequential zone files, ignore IOCB_NOWAIT
* For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
* as this can cause write reordering (e.g. the first aio gets EAGAIN
* on the inode lock but the second goes through but is now unaligned).
*/
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !is_sync_kiocb(iocb)
&& (iocb->ki_flags & IOCB_NOWAIT))
iocb->ki_flags &= ~IOCB_NOWAIT;
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !is_sync_kiocb(iocb) &&
(iocb->ki_flags & IOCB_NOWAIT))
return -EOPNOTSUPP;
if (iocb->ki_flags & IOCB_NOWAIT) {
if (!inode_trylock(inode))