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gluster: Support auto-read-only option 

If read-only=off, but auto-read-only=on is given, open the file
read-write if we have the permissions, but instead of erroring out for
read-only files, just degrade to read-only.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
This commit is contained in:
Kevin Wolf 2018-10-08 17:27:18 +02:00
parent 6ceef36acb
commit 54ea21bd16
1 changed files with 10 additions and 2 deletions
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12
block/gluster.c
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@ -849,8 +849,16 @@ static int qemu_gluster_open(BlockDriverState *bs, QDict *options,
qemu_gluster_parse_flags(bdrv_flags, &open_flags);
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
if (!s->fd) {
ret = -errno;
ret = s->fd ? 0 : -errno;
if (ret == -EACCES || ret == -EROFS) {
/* Try to degrade to read-only, but if it doesn't work, still use the
* normal error message. */
if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
open_flags = (open_flags & ~O_RDWR) | O_RDONLY;
s->fd = glfs_open(s->glfs, gconf->path, open_flags);
ret = s->fd ? 0 : -errno;
}
}
s->supports_seek_data = qemu_gluster_test_seek(s->fd);