From: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
commit 77af13ba3c7f91d91c377c7e2d122849bbc17128 upstream.
The call to invalidate_inode_pages2_range() in __iomap_dio_rw() may
fail, in which case -ENOTBLK is returned and this error code is
propagated back to user space trhough iomap_dio_rw() ->
zonefs_file_dio_write() return chain. This error code is fairly obscure
and may confuse the user. Avoid this and be consistent with the behavior
of zonefs_file_dio_append() for similar invalidate_inode_pages2_range()
errors by returning -EBUSY to user space when iomap_dio_rw() returns
-ENOTBLK.
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Fixes: 8dcc1a9d90c1 ("fs: New zonefs file system")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Tested-by: Hans Holmberg <hans.holmberg@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/zonefs/file.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
--- a/fs/zonefs/file.c
+++ b/fs/zonefs/file.c
@@ -567,11 +567,21 @@ static ssize_t zonefs_file_dio_write(str
append = sync;
}
- if (append)
+ if (append) {
ret = zonefs_file_dio_append(iocb, from);
- else
+ } else {
+ /*
+ * iomap_dio_rw() may return ENOTBLK if there was an issue with
+ * page invalidation. Overwrite that error code with EBUSY to
+ * be consistent with zonefs_file_dio_append() return value for
+ * similar issues.
+ */
ret = iomap_dio_rw(iocb, from, &zonefs_write_iomap_ops,
&zonefs_write_dio_ops, 0, NULL, 0);
+ if (ret == -ENOTBLK)
+ ret = -EBUSY;
+ }
+
if (zonefs_zone_is_seq(z) &&
(ret > 0 || ret == -EIOCBQUEUED)) {
if (ret > 0)
