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authorKevin Wolf <kwolf@redhat.com>2017-11-07 18:21:41 +0100
committerKevin Wolf <kwolf@redhat.com>2017-11-17 13:35:59 +0100
commit398e6ad014df261d20d3fd6cff2cfbf940bac714 (patch)
tree32ab30963ddfd86a2e4bb9199c393c6a466e00f3 /block/vvfat.c
parentf66afbe26f0c093d639610d70d16d7cc3183b652 (diff)
block: Deprecate bdrv_set_read_only() and users
bdrv_set_read_only() is used by some block drivers to override the read-only option given by the user. This is not how read-only images generally work in QEMU: Instead of second guessing what the user really meant (which currently includes making an image read-only even if the user didn't only use the default, but explicitly said read-only=off), we should error out if we can't provide what the user requested. This adds deprecation warnings to all callers of bdrv_set_read_only() so that the behaviour can be corrected after the usual deprecation period. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/vvfat.c')
-rw-r--r--block/vvfat.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/block/vvfat.c b/block/vvfat.c
index a0f2335894..0841cc42fc 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1259,7 +1259,11 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
"Unable to set VVFAT to 'rw' when drive is read-only");
goto fail;
}
- } else {
+ } else if (!bdrv_is_read_only(bs)) {
+ error_report("Opening non-rw vvfat images without an explicit "
+ "read-only=on option is deprecated. Future versions "
+ "will refuse to open the image instead of "
+ "automatically marking the image read-only.");
/* read only is the default for safety */
ret = bdrv_set_read_only(bs, true, &local_err);
if (ret < 0) {