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cifs: remove old dead code 

While reviewing a patch clarifying locks and locking hierarchy I
realized some locks were unused.

This commit removes old data and code that isn't actually used
anywhere, or hidden in ifdefs which cannot be enabled from the kernel
config.

* The uid/gid trees and associated locks are left-overs from when
  uid/sid mapping had an extra caching layer on top of the keyring and
  are now unused.
  See commit faa65f07d2 ("cifs: simplify id_to_sid and sid_to_id mapping code")
  from 2012.

* cifs_oplock_break_ops is a left-over from when slow_work was remplaced
  by regular workqueue and is now unused.
  See commit 9b64697246 ("cifs: use workqueue instead of slow-work")
  from 2010.

* CIFSSMBSetAttrLegacy is SMB1 cruft dealing with some legacy
  NT4/Win9x behaviour.

* Remove CONFIG_CIFS_DNOTIFY_EXPERIMENTAL left-overs. This was already
  partially removed in 392e1c5dc9 ("cifs: rename and clarify CIFS_ASYNC_OP and CIFS_NO_RESP")
  from 2019. Kill it completely.

* Another candidate that was considered but spared is
  CONFIG_CIFS_NFSD_EXPORT which has an empty implementation and cannot
  be enabled by a config option (although it is listed but disabled with
  "BROKEN" as a dep). It's unclear whether this could even function
  today in its current form but it has it's own .c file and Kconfig
  entry which is a bit more involved to remove and might make a come
  back?

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2021-04-12 18:01:43 +02:00 committed by Steve French
parent 9f4c6eed26
commit ec4e4862a9
5 changed files with 0 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/cifs/cifsfs.c
View File

@ -1526,10 +1526,6 @@ init_cifs(void)
int rc = 0;
cifs_proc_init();
INIT_LIST_HEAD(&cifs_tcp_ses_list);
#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
INIT_LIST_HEAD(&GlobalDnotifyReqList);
INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
/*
* Initialize Global counters
*/

17
fs/cifs/cifsglob.h
View File

@ -1824,13 +1824,6 @@ GLOBAL_EXTERN struct list_head cifs_tcp_ses_list;
*/
GLOBAL_EXTERN spinlock_t cifs_tcp_ses_lock;
#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
/* Outstanding dir notify requests */
GLOBAL_EXTERN struct list_head GlobalDnotifyReqList;
/* DirNotify response queue */
GLOBAL_EXTERN struct list_head GlobalDnotifyRsp_Q;
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
/*
* Global transaction id (XID) information
*/
@ -1874,19 +1867,9 @@ extern unsigned int cifs_min_small; /* min size of small buf pool */
extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
extern bool disable_legacy_dialects; /* forbid vers=1.0 and vers=2.0 mounts */
GLOBAL_EXTERN struct rb_root uidtree;
GLOBAL_EXTERN struct rb_root gidtree;
GLOBAL_EXTERN spinlock_t siduidlock;
GLOBAL_EXTERN spinlock_t sidgidlock;
GLOBAL_EXTERN struct rb_root siduidtree;
GLOBAL_EXTERN struct rb_root sidgidtree;
GLOBAL_EXTERN spinlock_t uidsidlock;
GLOBAL_EXTERN spinlock_t gidsidlock;
void cifs_oplock_break(struct work_struct *work);
void cifs_queue_oplock_break(struct cifsFileInfo *cfile);
extern const struct slow_work_ops cifs_oplock_break_ops;
extern struct workqueue_struct *cifsiod_wq;
extern struct workqueue_struct *decrypt_wq;
extern struct workqueue_struct *fileinfo_put_wq;

11
fs/cifs/cifsproto.h
View File

@ -358,11 +358,6 @@ extern int CIFSSMBSetFileDisposition(const unsigned int xid,
struct cifs_tcon *tcon,
bool delete_file, __u16 fid,
__u32 pid_of_opener);
#if 0
extern int CIFSSMBSetAttrLegacy(unsigned int xid, struct cifs_tcon *tcon,
char *fileName, __u16 dos_attributes,
const struct nls_table *nls_codepage);
#endif /* possibly unneeded function */
extern int CIFSSMBSetEOF(const unsigned int xid, struct cifs_tcon *tcon,
const char *file_name, __u64 size,
struct cifs_sb_info *cifs_sb, bool set_allocation);
@ -504,12 +499,6 @@ extern int generate_smb311signingkey(struct cifs_ses *);
extern int calc_lanman_hash(const char *password, const char *cryptkey,
bool encrypt, char *lnm_session_key);
#endif /* CIFS_WEAK_PW_HASH */
#ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
extern int CIFSSMBNotify(const unsigned int xid, struct cifs_tcon *tcon,
const int notify_subdirs, const __u16 netfid,
__u32 filter, struct file *file, int multishot,
const struct nls_table *nls_codepage);
#endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
extern int CIFSSMBCopy(unsigned int xid,
struct cifs_tcon *source_tcon,
const char *fromName,

50
fs/cifs/cifssmb.c
View File

@ -5917,56 +5917,6 @@ CIFSSMBSetPathInfo(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
/* Can not be used to set time stamps yet (due to old DOS time format) */
/* Can be used to set attributes */
#if 0 /* Possibly not needed - since it turns out that strangely NT4 has a bug
handling it anyway and NT4 was what we thought it would be needed for
Do not delete it until we prove whether needed for Win9x though */
int
CIFSSMBSetAttrLegacy(unsigned int xid, struct cifs_tcon *tcon, char *fileName,
__u16 dos_attrs, const struct nls_table *nls_codepage)
{
SETATTR_REQ *pSMB = NULL;
SETATTR_RSP *pSMBr = NULL;
int rc = 0;
int bytes_returned;
int name_len;
cifs_dbg(FYI, "In SetAttrLegacy\n");
SetAttrLgcyRetry:
rc = smb_init(SMB_COM_SETATTR, 8, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len =
ConvertToUTF16((__le16 *) pSMB->fileName, fileName,
PATH_MAX, nls_codepage);
name_len++; /* trailing null */
name_len *= 2;
} else {
name_len = copy_path_name(pSMB->fileName, fileName);
}
pSMB->attr = cpu_to_le16(dos_attrs);
pSMB->BufferFormat = 0x04;
inc_rfc1001_len(pSMB, name_len + 1);
pSMB->ByteCount = cpu_to_le16(name_len + 1);
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
if (rc)
cifs_dbg(FYI, "Error in LegacySetAttr = %d\n", rc);
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto SetAttrLgcyRetry;
return rc;
}
#endif /* temporarily unneeded SetAttr legacy function */
static void
cifs_fill_unix_set_info(FILE_UNIX_BASIC_INFO *data_offset,
const struct cifs_unix_set_info_args *args)

9
fs/cifs/inode.c
View File

@ -2961,12 +2961,3 @@ cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
/* BB: add cifs_setattr_legacy for really old servers */
return rc;
}
#if 0
void cifs_delete_inode(struct inode *inode)
{
cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
/* may have to add back in if and when safe distributed caching of
directories added e.g. via FindNotify */
}
#endif