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[Qemu-block] [PATCH v9 14/31] block: Add bdrv_dirname()
From: |
Max Reitz |
Subject: |
[Qemu-block] [PATCH v9 14/31] block: Add bdrv_dirname() |
Date: |
Thu, 28 Jun 2018 02:07:28 +0200 |
This function may be implemented by block drivers to derive a directory
name from a BDS. Concatenating this g_free()-able string with a relative
filename must result in a valid (not necessarily existing) filename, so
this is a function that should generally be not implemented by format
drivers, because this is protocol-specific.
If a BDS's driver does not implement this function, bdrv_dirname() will
fall through to the BDS's file if it exists. If it does not, the
exact_filename field will be used to generate a directory name.
Signed-off-by: Max Reitz <address@hidden>
---
include/block/block.h | 1 +
include/block/block_int.h | 7 +++++++
block.c | 27 +++++++++++++++++++++++++++
3 files changed, 35 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 7c4ff51f8a..1401203c6a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -461,6 +461,7 @@ char *bdrv_get_full_backing_filename(BlockDriverState *bs,
Error **errp);
char *bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
Error **errp);
+char *bdrv_dirname(BlockDriverState *bs, Error **errp);
int path_has_protocol(const char *path);
int path_is_absolute(const char *path);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index de00863913..eac41d8d63 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -141,6 +141,13 @@ struct BlockDriver {
void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+ /*
+ * Returns an allocated string which is the directory name of this BDS: It
+ * will be used to make relative filenames absolute by prepending this
+ * function's return value to them.
+ */
+ char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp);
+
/* aio */
BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs,
uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags,
diff --git a/block.c b/block.c
index 5d736e0fc1..ce7ff48553 100644
--- a/block.c
+++ b/block.c
@@ -5345,6 +5345,33 @@ void bdrv_refresh_filename(BlockDriverState *bs)
}
}
+char *bdrv_dirname(BlockDriverState *bs, Error **errp)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv) {
+ error_setg(errp, "Node '%s' is ejected", bs->node_name);
+ return NULL;
+ }
+
+ if (drv->bdrv_dirname) {
+ return drv->bdrv_dirname(bs, errp);
+ }
+
+ if (bs->file) {
+ return bdrv_dirname(bs->file->bs, errp);
+ }
+
+ bdrv_refresh_filename(bs);
+ if (bs->exact_filename[0] != '\0') {
+ return path_combine(bs->exact_filename, "");
+ }
+
+ error_setg(errp, "Cannot generate a base directory for %s nodes",
+ drv->format_name);
+ return NULL;
+}
+
/*
* Hot add/remove a BDS's child. So the user can take a child offline when
* it is broken and take a new child online
--
2.17.1
- Re: [Qemu-block] [Qemu-devel] [PATCH v9 05/31] block: Respect backing bs in bdrv_refresh_filename, (continued)
- [Qemu-block] [PATCH v9 07/31] iotests.py: Add node_info(), Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 06/31] iotests.py: Add filter_imgfmt(), Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 09/31] block: Make path_combine() return the path, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 08/31] iotests: Add test for backing file overrides, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 11/31] block: bdrv_get_full_backing_filename's ret. val., Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 10/31] block: bdrv_get_full_backing_filename_from_...'s ret. val., Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 12/31] block: Add bdrv_make_absolute_filename(), Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 13/31] block: Fix bdrv_find_backing_image(), Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 14/31] block: Add bdrv_dirname(),
Max Reitz <=
- [Qemu-block] [PATCH v9 16/31] quorum: Make bdrv_dirname() return NULL, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 15/31] blkverify: Make bdrv_dirname() return NULL, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 17/31] block/nbd: Make bdrv_dirname() return NULL, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 18/31] block/nfs: Implement bdrv_dirname(), Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 19/31] block: Use bdrv_dirname() for relative filenames, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 20/31] iotests: Add quorum case to test 110, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 21/31] block: Add strong_runtime_opts to BlockDriver, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 23/31] block: Generically refresh runtime options, Max Reitz, 2018/06/27
- [Qemu-block] [PATCH v9 22/31] block: Add BlockDriver.bdrv_gather_child_options, Max Reitz, 2018/06/27