mirror of https://gitee.com/openkylin/qemu.git
file-posix: 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: Eric Blake <eblake@redhat.com>
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6c2e581d4d
commit
64107dc044
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@ -527,9 +527,22 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
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s->fd = -1;
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fd = qemu_open(filename, s->open_flags, 0644);
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if (fd < 0) {
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ret = -errno;
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error_setg_errno(errp, errno, "Could not open '%s'", filename);
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ret = fd < 0 ? -errno : 0;
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if (ret == -EACCES || ret == -EROFS) {
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/* Try to degrade to read-only, but if it doesn't work, still use the
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* normal error message. */
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if (bdrv_apply_auto_read_only(bs, NULL, NULL) == 0) {
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bdrv_flags &= ~BDRV_O_RDWR;
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raw_parse_flags(bdrv_flags, &s->open_flags);
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assert(!(s->open_flags & O_CREAT));
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fd = qemu_open(filename, s->open_flags);
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ret = fd < 0 ? -errno : 0;
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}
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}
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Could not open '%s'", filename);
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if (ret == -EROFS) {
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ret = -EACCES;
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}
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