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sheepdog: Allow fully preallocated truncation

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Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2018-02-13 14:03:56 +01:00 committed by Kevin Wolf
parent 1a62baf62b
commit 74f1eabf9c
1 changed files with 12 additions and 3 deletions
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15
block/sheepdog.c
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@ -2180,15 +2180,16 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset,
int ret, fd; int ret, fd;
unsigned int datalen; unsigned int datalen;
uint64_t max_vdi_size; 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'", error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_str(prealloc)); PreallocMode_str(prealloc));
return -ENOTSUP; return -ENOTSUP;
} }
max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS; 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"); error_setg(errp, "shrinking is not supported");
return -EINVAL; return -EINVAL;
} else if (offset > max_vdi_size) { } else if (offset > max_vdi_size) {
@ -2211,9 +2212,17 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset,
if (ret < 0) { if (ret < 0) {
error_setg_errno(errp, -ret, "failed to update an inode"); error_setg_errno(errp, -ret, "failed to update an inode");
return ret;
} }
return ret; if (prealloc == PREALLOC_MODE_FULL) {
ret = sd_prealloc(bs, old_size, offset, errp);
if (ret < 0) {
return ret;
}
}
return 0;
} }
/* /*