Commit 74f1eabf authored by Max Reitz's avatar Max Reitz Committed by Kevin Wolf
Browse files

sheepdog: Allow fully preallocated truncation 



Signed-off-by: default avatarMax Reitz <mreitz@redhat.com>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 1a62baf6

block/sheepdog.c

+12 −3
Original line number Diff line number Diff line
@@ -2180,15 +2180,16 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset, 
    int ret, fd;

    unsigned int datalen;

    uint64_t max_vdi_size;

    int64_t old_size = s->inode.vdi_size;



    if (prealloc != PREALLOC_MODE_OFF) {

    if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_FULL) {

        error_setg(errp, "Unsupported preallocation mode '%s'",

                   PreallocMode_str(prealloc));

        return -ENOTSUP;

    }



    max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS;

    if (offset < s->inode.vdi_size) {

    if (offset < old_size) {

        error_setg(errp, "shrinking is not supported");

        return -EINVAL;

    } else if (offset > max_vdi_size) {
@@ -2211,10 +2212,18 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset, 


    if (ret < 0) {

        error_setg_errno(errp, -ret, "failed to update an inode");

        return ret;

    }



    if (prealloc == PREALLOC_MODE_FULL) {

        ret = sd_prealloc(bs, old_size, offset, errp);

        if (ret < 0) {

            return ret;

        }

    }



    return 0;

}



/*

 * This function is called after writing data objects.  If we need to