mirror of https://github.com/xemu-project/xemu.git
raw-posix: Factor block size detection out of raw_probe_alignment()
Put it in new probe_logical_blocksize(). Signed-off-by: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1424087278-49393-3-git-send-email-tumanova@linux.vnet.ibm.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -218,11 +218,43 @@ static int raw_normalize_devicepath(const char **filename)
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}
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#endif
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/*
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* Get logical block size via ioctl. On success store it in @sector_size_p.
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*/
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static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
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{
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unsigned int sector_size;
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bool success = false;
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errno = ENOTSUP;
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/* Try a few ioctls to get the right size */
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#ifdef BLKSSZGET
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if (ioctl(fd, BLKSSZGET, §or_size) >= 0) {
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*sector_size_p = sector_size;
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success = true;
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}
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#endif
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#ifdef DKIOCGETBLOCKSIZE
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if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) >= 0) {
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*sector_size_p = sector_size;
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success = true;
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}
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#endif
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#ifdef DIOCGSECTORSIZE
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if (ioctl(fd, DIOCGSECTORSIZE, §or_size) >= 0) {
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*sector_size_p = sector_size;
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success = true;
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}
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#endif
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return success ? 0 : -errno;
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}
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static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
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{
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BDRVRawState *s = bs->opaque;
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char *buf;
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unsigned int sector_size;
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/* For /dev/sg devices the alignment is not really used.
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With buffered I/O, we don't have any restrictions. */
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@ -232,25 +264,12 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp)
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return;
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}
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/* Try a few ioctls to get the right size */
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bs->request_alignment = 0;
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s->buf_align = 0;
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#ifdef BLKSSZGET
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if (ioctl(fd, BLKSSZGET, §or_size) >= 0) {
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bs->request_alignment = sector_size;
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/* Let's try to use the logical blocksize for the alignment. */
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if (probe_logical_blocksize(fd, &bs->request_alignment) < 0) {
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bs->request_alignment = 0;
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}
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#endif
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#ifdef DKIOCGETBLOCKSIZE
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if (ioctl(fd, DKIOCGETBLOCKSIZE, §or_size) >= 0) {
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bs->request_alignment = sector_size;
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}
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#endif
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#ifdef DIOCGSECTORSIZE
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if (ioctl(fd, DIOCGSECTORSIZE, §or_size) >= 0) {
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bs->request_alignment = sector_size;
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}
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#endif
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#ifdef CONFIG_XFS
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if (s->is_xfs) {
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struct dioattr da;
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