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cifs: fix smb3_zero_range so it can expand the file-size when required

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This allows fallocate -z to work against a Windows2016 share.

This is due to the SMB3 ZERO_RANGE command does not modify the filesize.
To address this we will now append a compounded SET-INFO to update the
end-of-file information.

This brings xfstests generic/469 closer to working against a windows share.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2019-03-13 14:37:49 +10:00 committed by Steve French
parent ccdc77a305
commit 72c419d9b0
3 changed files with 68 additions and 19 deletions
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76
fs/cifs/smb2ops.c
View File

@ -2549,12 +2549,22 @@ get_smb2_acl(struct cifs_sb_info *cifs_sb,
static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
loff_t offset, loff_t len, bool keep_size)
{
struct cifs_ses *ses = tcon->ses;
struct inode *inode;
struct cifsInodeInfo *cifsi;
struct cifsFileInfo *cfile = file->private_data;
struct file_zero_data_information fsctl_buf;
struct smb_rqst rqst[2];
int resp_buftype[2];
struct kvec rsp_iov[2];
struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
struct kvec si_iov[1];
unsigned int size[1];
void *data[1];
long rc;
unsigned int xid;
int num = 0, flags = 0;
__le64 eof;
xid = get_xid();
@ -2579,28 +2589,60 @@ static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
return rc;
}
/*
* need to make sure we are not asked to extend the file since the SMB3
* fsctl does not change the file size. In the future we could change
* this to zero the first part of the range then set the file size
* which for a non sparse file would zero the newly extended range
*/
if (keep_size == false)
if (i_size_read(inode) < offset + len) {
rc = -EOPNOTSUPP;
free_xid(xid);
return rc;
}
cifs_dbg(FYI, "offset %lld len %lld", offset, len);
fsctl_buf.FileOffset = cpu_to_le64(offset);
fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
true /* is_fctl */, (char *)&fsctl_buf,
sizeof(struct file_zero_data_information), NULL, NULL);
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(rqst, 0, sizeof(rqst));
resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));
memset(&io_iov, 0, sizeof(io_iov));
rqst[num].rq_iov = io_iov;
rqst[num].rq_nvec = SMB2_IOCTL_IOV_SIZE;
rc = SMB2_ioctl_init(tcon, &rqst[num++], cfile->fid.persistent_fid,
cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
true /* is_fctl */, (char *)&fsctl_buf,
sizeof(struct file_zero_data_information));
if (rc)
goto zero_range_exit;
/*
* do we also need to change the size of the file?
*/
if (keep_size == false && i_size_read(inode) < offset + len) {
smb2_set_next_command(tcon, &rqst[0]);
memset(&si_iov, 0, sizeof(si_iov));
rqst[num].rq_iov = si_iov;
rqst[num].rq_nvec = 1;
eof = cpu_to_le64(offset + len);
size[0] = 8; /* sizeof __le64 */
data[0] = &eof;
rc = SMB2_set_info_init(tcon, &rqst[num++],
cfile->fid.persistent_fid,
cfile->fid.persistent_fid,
current->tgid,
FILE_END_OF_FILE_INFORMATION,
SMB2_O_INFO_FILE, 0, data, size);
smb2_set_related(&rqst[1]);
}
rc = compound_send_recv(xid, ses, flags, num, rqst,
resp_buftype, rsp_iov);
zero_range_exit:
SMB2_ioctl_free(&rqst[0]);
SMB2_set_info_free(&rqst[1]);
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
free_xid(xid);
return rc;
}

4
fs/cifs/smb2pdu.c
View File

@ -2555,7 +2555,7 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
struct smb_rqst rqst;
struct smb2_ioctl_rsp *rsp = NULL;
struct cifs_ses *ses;
struct kvec iov[2];
struct kvec iov[SMB2_IOCTL_IOV_SIZE];
struct kvec rsp_iov = {NULL, 0};
int resp_buftype = CIFS_NO_BUFFER;
int rc = 0;
@ -2584,7 +2584,7 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
memset(&rqst, 0, sizeof(struct smb_rqst));
memset(&iov, 0, sizeof(iov));
rqst.rq_iov = iov;
rqst.rq_nvec = 2;
rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid,
opcode, is_fsctl, in_data, indatalen);

7
fs/cifs/smb2pdu.h
View File

@ -959,6 +959,13 @@ struct duplicate_extents_to_file {
__le64 ByteCount; /* Bytes to be copied */
} __packed;
/*
* Maximum number of iovs we need for an ioctl request.
* [0] : struct smb2_ioctl_req
* [1] : in_data
*/
#define SMB2_IOCTL_IOV_SIZE 2
struct smb2_ioctl_req {
struct smb2_sync_hdr sync_hdr;
__le16 StructureSize; /* Must be 57 */