From: Daniel Henrique Barboza <danielhb...@gmail.com>
Adding to Block Drivers the capability of being able to clean up
its created files can be useful in certain situations. For the
LUKS driver, for instance, a failure in one of its authentication
steps can leave files in the host that weren't there before.
This patch adds the 'bdrv_co_delete_file' interface to block
drivers and add it to the 'file' driver in file-posix.c. The
implementation is given by 'raw_co_delete_file'.
Suggested-by: Daniel P. Berrangé <berra...@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb...@gmail.com>
Message-Id: <20200130213907.2830642-2-danielhb...@gmail.com>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
include/block/block_int.h | 4 ++++
block/file-posix.c | 23 +++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index d8d13700a9..ae9c4da4d0 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -314,6 +314,10 @@ struct BlockDriver {
*/
int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs);
+ /* Delete a created file. */
+ int coroutine_fn (*bdrv_co_delete_file)(BlockDriverState *bs,
+ Error **errp);
+
/*
* Flushes all data that was already written to the OS all the way down to
* the disk (for example file-posix.c calls fsync()).
diff --git a/block/file-posix.c b/block/file-posix.c
index 0f77447a25..9bc3838b2a 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2445,6 +2445,28 @@ static int coroutine_fn raw_co_create_opts(const char
*filename, QemuOpts *opts,
return raw_co_create(&options, errp);
}
+static int coroutine_fn raw_co_delete_file(BlockDriverState *bs,
+ Error **errp)
+{
+ struct stat st;
+ int ret;
+
+ if (!(stat(bs->filename, &st) == 0) || !S_ISREG(st.st_mode)) {
+ error_setg_errno(errp, ENOENT, "%s is not a regular file",
+ bs->filename);
+ return -ENOENT;
+ }
+
+ ret = unlink(bs->filename);
+ if (ret < 0) {
+ ret = -errno;
+ error_setg_errno(errp, -ret, "Error when deleting file %s",
+ bs->filename);
+ }
+
+ return ret;
+}
+
/*
* Find allocation range in @bs around offset @start.
* May change underlying file descriptor's file offset.
@@ -3075,6 +3097,7 @@ BlockDriver bdrv_file = {
.bdrv_co_block_status = raw_co_block_status,
.bdrv_co_invalidate_cache = raw_co_invalidate_cache,
.bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,
+ .bdrv_co_delete_file = raw_co_delete_file,
.bdrv_co_preadv = raw_co_preadv,
.bdrv_co_pwritev = raw_co_pwritev,
--
2.20.1
