From 9581770f48911cbe68cfa1a7fa125df2a0a27d02 Mon Sep 17 00:00:00 2001 From: Maxim Levitsky Date: Sun, 31 May 2020 16:40:33 +0100 Subject: [PATCH 5/7] block: introducing 'bdrv_co_delete_file' interface MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Maxim Levitsky Message-id: <20200531164035.34188-2-mlevitsk@redhat.com> Patchwork-id: 97057 O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/3] block: introducing 'bdrv_co_delete_file' interface Bugzilla: 1827630 RH-Acked-by: Sergio Lopez Pascual RH-Acked-by: John Snow RH-Acked-by: Eric Blake From: Daniel Henrique Barboza 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 Signed-off-by: Daniel Henrique Barboza Message-Id: <20200130213907.2830642-2-danielhb413@gmail.com> Signed-off-by: Kevin Wolf (cherry picked from commit 9bffae14df879255329473a7bd578643af2d4c9c) Signed-off-by: Maxim Levitsky Signed-off-by: Danilo C. L. de Paula --- block/file-posix.c | 23 +++++++++++++++++++++++ include/block/block_int.h | 4 ++++ 2 files changed, 27 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index dd18d40..1609598 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2388,6 +2388,28 @@ static int coroutine_fn raw_co_create_opts(BlockDriver *drv, 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. @@ -3019,6 +3041,7 @@ 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, diff --git a/include/block/block_int.h b/include/block/block_int.h index 529f153..562dca1 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -316,6 +316,10 @@ 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()). -- 1.8.3.1