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SMB3 fixes: two fixes for stable, one that had dependency on earlier patch in this merge window and can now go in, and a perf improvement in SMB3 open

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Merge tag '5.3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Two fixes for stable, one that had dependency on earlier patch in this
  merge window and can now go in, and a perf improvement in SMB3 open"

* tag '5.3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: update internal module number
  cifs: flush before set-info if we have writeable handles
  smb3: optimize open to not send query file internal info
  cifs: copy_file_range needs to strip setuid bits and update timestamps
  CIFS: fix deadlock in cached root handling
This commit is contained in:
Linus Torvalds 2019-07-21 10:01:17 -07:00
commit 91962d0f79
8 changed files with 126 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
fs/cifs/cifsfs.c
View File

@ -1104,6 +1104,10 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
goto out;
}
rc = -EOPNOTSUPP;
if (!target_tcon->ses->server->ops->copychunk_range)
goto out;
/*
* Note: cifs case is easier than btrfs since server responsible for
* checks for proper open modes and file type and if it wants
@ -1115,11 +1119,12 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
/* should we flush first and last page first */
truncate_inode_pages(&target_inode->i_data, 0);
if (target_tcon->ses->server->ops->copychunk_range)
rc = file_modified(dst_file);
if (!rc)
rc = target_tcon->ses->server->ops->copychunk_range(xid,
smb_file_src, smb_file_target, off, len, destoff);
else
rc = -EOPNOTSUPP;
file_accessed(src_file);
/* force revalidate of size and timestamps of target file now
* that target is updated on the server

2
fs/cifs/cifsfs.h
View File

@ -152,5 +152,5 @@ extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
extern const struct export_operations cifs_export_ops;
#endif /* CONFIG_CIFS_NFSD_EXPORT */
#define CIFS_VERSION "2.20"
#define CIFS_VERSION "2.21"
#endif /* _CIFSFS_H */

16
fs/cifs/inode.c
View File

@ -2406,6 +2406,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct inode *inode = d_inode(direntry);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
char *full_path = NULL;
int rc = -EACCES;
__u32 dosattr = 0;
@ -2452,6 +2454,20 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
mapping_set_error(inode->i_mapping, rc);
rc = 0;
if (attrs->ia_valid & ATTR_MTIME) {
rc = cifs_get_writable_file(cifsInode, false, &wfile);
if (!rc) {
tcon = tlink_tcon(wfile->tlink);
rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
cifsFileInfo_put(wfile);
if (rc)
return rc;
} else if (rc != -EBADF)
return rc;
else
rc = 0;
}
if (attrs->ia_valid & ATTR_SIZE) {
rc = cifs_set_file_size(inode, attrs, xid, full_path);
if (rc != 0)

18
fs/cifs/smb2file.c
View File

@ -88,14 +88,20 @@ smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
}
if (buf) {
/* open response does not have IndexNumber field - get it */
rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
/* if open response does not have IndexNumber field - get it */
if (smb2_data->IndexNumber == 0) {
rc = SMB2_get_srv_num(xid, oparms->tcon,
fid->persistent_fid,
fid->volatile_fid,
&smb2_data->IndexNumber);
if (rc) {
/* let get_inode_info disable server inode numbers */
smb2_data->IndexNumber = 0;
rc = 0;
if (rc) {
/*
* let get_inode_info disable server inode
* numbers
*/
smb2_data->IndexNumber = 0;
rc = 0;
}
}
move_smb2_info_to_cifs(buf, smb2_data);
}

53
fs/cifs/smb2ops.c
View File

@ -694,8 +694,51 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
smb2_set_related(&rqst[1]);
/*
* We do not hold the lock for the open because in case
* SMB2_open needs to reconnect, it will end up calling
* cifs_mark_open_files_invalid() which takes the lock again
* thus causing a deadlock
*/
mutex_unlock(&tcon->crfid.fid_mutex);
rc = compound_send_recv(xid, ses, flags, 2, rqst,
resp_buftype, rsp_iov);
mutex_lock(&tcon->crfid.fid_mutex);
/*
* Now we need to check again as the cached root might have
* been successfully re-opened from a concurrent process
*/
if (tcon->crfid.is_valid) {
/* work was already done */
/* stash fids for close() later */
struct cifs_fid fid = {
.persistent_fid = pfid->persistent_fid,
.volatile_fid = pfid->volatile_fid,
};
/*
* caller expects this func to set pfid to a valid
* cached root, so we copy the existing one and get a
* reference.
*/
memcpy(pfid, tcon->crfid.fid, sizeof(*pfid));
kref_get(&tcon->crfid.refcount);
mutex_unlock(&tcon->crfid.fid_mutex);
if (rc == 0) {
/* close extra handle outside of crit sec */
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
}
goto oshr_free;
}
/* Cached root is still invalid, continue normaly */
if (rc)
goto oshr_exit;
@ -711,11 +754,12 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
tcon->crfid.is_valid = true;
kref_init(&tcon->crfid.refcount);
/* BB TBD check to see if oplock level check can be removed below */
if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
kref_get(&tcon->crfid.refcount);
oplock = smb2_parse_lease_state(server, o_rsp,
&oparms.fid->epoch,
oparms.fid->lease_key);
smb2_parse_contexts(server, o_rsp,
&oparms.fid->epoch,
oparms.fid->lease_key, &oplock, NULL);
} else
goto oshr_exit;
@ -729,8 +773,9 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
(char *)&tcon->crfid.file_all_info))
tcon->crfid.file_all_info_is_valid = 1;
oshr_exit:
oshr_exit:
mutex_unlock(&tcon->crfid.fid_mutex);
oshr_free:
SMB2_open_free(&rqst[0]);
SMB2_query_info_free(&rqst[1]);
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);

46
fs/cifs/smb2pdu.c
View File

@ -1873,10 +1873,21 @@ create_reconnect_durable_buf(struct cifs_fid *fid)
return buf;
}
__u8
smb2_parse_lease_state(struct TCP_Server_Info *server,
static void
parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
{
struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
pdisk_id->DiskFileId, pdisk_id->VolumeId);
buf->IndexNumber = pdisk_id->DiskFileId;
}
void
smb2_parse_contexts(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key)
unsigned int *epoch, char *lease_key, __u8 *oplock,
struct smb2_file_all_info *buf)
{
char *data_offset;
struct create_context *cc;
@ -1884,15 +1895,24 @@ smb2_parse_lease_state(struct TCP_Server_Info *server,
unsigned int remaining;
char *name;
*oplock = 0;
data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
remaining = le32_to_cpu(rsp->CreateContextsLength);
cc = (struct create_context *)data_offset;
/* Initialize inode number to 0 in case no valid data in qfid context */
if (buf)
buf->IndexNumber = 0;
while (remaining >= sizeof(struct create_context)) {
name = le16_to_cpu(cc->NameOffset) + (char *)cc;
if (le16_to_cpu(cc->NameLength) == 4 &&
strncmp(name, "RqLs", 4) == 0)
return server->ops->parse_lease_buf(cc, epoch,
lease_key);
strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
*oplock = server->ops->parse_lease_buf(cc, epoch,
lease_key);
else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
parse_query_id_ctxt(cc, buf);
next = le32_to_cpu(cc->Next);
if (!next)
@ -1901,7 +1921,10 @@ smb2_parse_lease_state(struct TCP_Server_Info *server,
cc = (struct create_context *)((char *)cc + next);
}
return 0;
if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
*oplock = rsp->OplockLevel;
return;
}
static int
@ -2588,12 +2611,9 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
buf->DeletePending = 0;
}
if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
*oplock = smb2_parse_lease_state(server, rsp,
&oparms->fid->epoch,
oparms->fid->lease_key);
else
*oplock = rsp->OplockLevel;
smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
oparms->fid->lease_key, oplock, buf);
creat_exit:
SMB2_open_free(&rqst);
free_rsp_buf(resp_buftype, rsp);

4
fs/cifs/smb2pdu.h
View File

@ -818,7 +818,9 @@ struct durable_reconnect_context_v2 {
} __packed;
/* See MS-SMB2 2.2.14.2.9 */
struct on_disk_id {
struct create_on_disk_id {
struct create_context ccontext;
__u8 Name[8];
__le64 DiskFileId;
__le64 VolumeId;
__u32 Reserved[4];

7
fs/cifs/smb2proto.h
View File

@ -228,9 +228,10 @@ extern int smb3_validate_negotiate(const unsigned int, struct cifs_tcon *);
extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
enum securityEnum);
extern __u8 smb2_parse_lease_state(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key);
extern void smb2_parse_contexts(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key,
__u8 *oplock, struct smb2_file_all_info *buf);
extern int smb3_encryption_required(const struct cifs_tcon *tcon);
extern int smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
struct kvec *iov, unsigned int min_buf_size);