[CIFS] UID/GID override on CIFS mounts to Samba

When CIFS Unix Extensions are negotiated we get the Unix uid and gid
owners of the file from the server (on the Unix Query Path Info
levels), but if the server's uids don't match the client uid's users
were having to disable the Unix Extensions (which turned off features
they still wanted).   The changeset patch allows users to override uid
and/or gid for file/directory owner with a default uid and/or gid
specified at mount (as is often done when mounting from Linux cifs
client to Windows server).  This changeset also displays the uid
and gid used by default in /proc/mounts (if applicable).

Also cleans up code by adding some of the missing spaces after
"if" keywords per-kernel style guidelines (as suggested by Randy Dunlap
when he reviewed the patch).

Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 67 insertions, 62 deletions

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index b80b0fc1c4c4..b5364f90d551 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -37,19 +37,19 @@ static void dump_cifs_file_struct(struct file *file, char *label)
 {
         struct cifsFileInfo * cf;
 
-        if(file) {
+        if (file) {
                 cf = file->private_data;
-                if(cf == NULL) {
+                if (cf == NULL) {
                         cFYI(1,("empty cifs private file data"));
                         return;
                 }
-                if(cf->invalidHandle) {
+                if (cf->invalidHandle) {
                         cFYI(1,("invalid handle"));
                 }
-                if(cf->srch_inf.endOfSearch) {
+                if (cf->srch_inf.endOfSearch) {
                         cFYI(1,("end of search"));
                 }
-                if(cf->srch_inf.emptyDir) {
+                if (cf->srch_inf.emptyDir) {
                         cFYI(1,("empty dir"));
                 }
                 
@@ -77,17 +77,17 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
                 *ptmp_inode = tmp_dentry->d_inode;
 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
-                if(*ptmp_inode == NULL) {
+                if (*ptmp_inode == NULL) {
                         *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
-                        if(*ptmp_inode == NULL)
+                        if (*ptmp_inode == NULL)
                                 return rc;
                         rc = 1;
                 }
-                if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
+                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
         } else {
                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
-                if(tmp_dentry == NULL) {
+                if (tmp_dentry == NULL) {
                         cERROR(1,("Failed allocating dentry"));
                         *ptmp_inode = NULL;
                         return rc;
@@ -98,9 +98,9 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
                 else
                         tmp_dentry->d_op = &cifs_dentry_ops;
-                if(*ptmp_inode == NULL)
+                if (*ptmp_inode == NULL)
                         return rc;
-                if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
+                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
                         (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;                       
                 rc = 2;
         }
@@ -112,7 +112,7 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
 
 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
 {
-        if((tcon) && (tcon->ses) && (tcon->ses->server)) {
+        if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
@@ -137,7 +137,7 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
         local_mtime = tmp_inode->i_mtime;
         local_size  = tmp_inode->i_size;
 
-        if(new_buf_type) {
+        if (new_buf_type) {
                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
 
                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
@@ -193,7 +193,7 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
         if (attr & ATTR_DIRECTORY) {
                 *pobject_type = DT_DIR;
                 /* override default perms since we do not lock dirs */
-                if(atomic_read(&cifsInfo->inUse) == 0) {
+                if (atomic_read(&cifsInfo->inUse) == 0) {
                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
                 }
                 tmp_inode->i_mode |= S_IFDIR;
@@ -250,25 +250,25 @@ static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
         if (S_ISREG(tmp_inode->i_mode)) {
                 cFYI(1, ("File inode"));
                 tmp_inode->i_op = &cifs_file_inode_ops;
-                if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
-                        if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
+                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
                         else
                                 tmp_inode->i_fop = &cifs_file_direct_ops;
                 
-                } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
                 else
                         tmp_inode->i_fop = &cifs_file_ops;
 
-                if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
+                if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
                    (cifs_sb->tcon->ses->server->maxBuf <
                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
                 else
                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 
-                if(isNewInode)
+                if (isNewInode)
                         return; /* No sense invalidating pages for new inode
                                    since have not started caching readahead file
                                    data yet */
@@ -357,8 +357,14 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
                 cFYI(1,("unknown inode type %d",type)); 
         }
 
-        tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
-        tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
+        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
+                tmp_inode->i_uid = cifs_sb->mnt_uid;
+        else
+                tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
+        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
+                tmp_inode->i_gid = cifs_sb->mnt_gid;
+        else
+                tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 
         spin_lock(&tmp_inode->i_lock);
@@ -377,25 +383,24 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
                 cFYI(1, ("File inode"));
                 tmp_inode->i_op = &cifs_file_inode_ops;
 
-                if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
-                        if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
+                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
                         else
                                 tmp_inode->i_fop = &cifs_file_direct_ops;
-                
-                } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
                 else
                         tmp_inode->i_fop = &cifs_file_ops;
 
-                if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
+                if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
                    (cifs_sb->tcon->ses->server->maxBuf < 
                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
                 else
                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
 
-                if(isNewInode)
+                if (isNewInode)
                         return; /* No sense invalidating pages for new inode since we
                                            have not started caching readahead file data yet */
 
@@ -430,28 +435,28 @@ static int initiate_cifs_search(const int xid, struct file *file)
         struct cifs_sb_info *cifs_sb;
         struct cifsTconInfo *pTcon;
 
-        if(file->private_data == NULL) {
+        if (file->private_data == NULL) {
                 file->private_data = 
                         kzalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
         }
 
-        if(file->private_data == NULL)
+        if (file->private_data == NULL)
                 return -ENOMEM;
         cifsFile = file->private_data;
         cifsFile->invalidHandle = TRUE;
         cifsFile->srch_inf.endOfSearch = FALSE;
 
         cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-        if(cifs_sb == NULL)
+        if (cifs_sb == NULL)
                 return -EINVAL;
 
         pTcon = cifs_sb->tcon;
-        if(pTcon == NULL)
+        if (pTcon == NULL)
                 return -EINVAL;
 
         full_path = build_path_from_dentry(file->f_path.dentry);
 
-        if(full_path == NULL) {
+        if (full_path == NULL) {
                 return -ENOMEM;
         }
 
@@ -474,9 +479,9 @@ ffirst_retry:
                 &cifsFile->netfid, &cifsFile->srch_inf,
                 cifs_sb->mnt_cifs_flags & 
                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
-        if(rc == 0)
+        if (rc == 0)
                 cifsFile->invalidHandle = FALSE;
-        if((rc == -EOPNOTSUPP) && 
+        if ((rc == -EOPNOTSUPP) && 
                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
                 goto ffirst_retry;
@@ -492,7 +497,7 @@ static int cifs_unicode_bytelen(char *str)
         __le16 * ustr = (__le16 *)str;
 
         for(len=0;len <= PATH_MAX;len++) {
-                if(ustr[len] == 0)
+                if (ustr[len] == 0)
                         return len << 1;
         }
         cFYI(1,("Unicode string longer than PATH_MAX found"));
@@ -504,7 +509,7 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
         char * new_entry;
         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 
-        if(level == SMB_FIND_FILE_INFO_STANDARD) {
+        if (level == SMB_FIND_FILE_INFO_STANDARD) {
                 FIND_FILE_STANDARD_INFO * pfData;
                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
 
@@ -514,12 +519,12 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
         /* validate that new_entry is not past end of SMB */
-        if(new_entry >= end_of_smb) {
+        if (new_entry >= end_of_smb) {
                 cERROR(1,
                       ("search entry %p began after end of SMB %p old entry %p",
                         new_entry, end_of_smb, old_entry)); 
                 return NULL;
-        } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
+        } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
@@ -540,39 +545,39 @@ static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
         char * filename = NULL;
         int len = 0; 
 
-        if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
+        if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
-                if(cfile->srch_inf.unicode) {
+                if (cfile->srch_inf.unicode) {
                         len = cifs_unicode_bytelen(filename);
                 } else {
                         /* BB should we make this strnlen of PATH_MAX? */
                         len = strnlen(filename, 5);
                 }
-        } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
+        } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
                 FILE_DIRECTORY_INFO * pFindData = 
                         (FILE_DIRECTORY_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
-        } else if(cfile->srch_inf.info_level == 
+        } else if (cfile->srch_inf.info_level == 
                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
                 FILE_FULL_DIRECTORY_INFO * pFindData = 
                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
-        } else if(cfile->srch_inf.info_level ==
+        } else if (cfile->srch_inf.info_level ==
                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
-        } else if(cfile->srch_inf.info_level == 
+        } else if (cfile->srch_inf.info_level == 
                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
-        } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
+        } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
                 FIND_FILE_STANDARD_INFO * pFindData =
                         (FIND_FILE_STANDARD_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
@@ -581,25 +586,25 @@ static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
         }
 
-        if(filename) {
-                if(cfile->srch_inf.unicode) {
+        if (filename) {
+                if (cfile->srch_inf.unicode) {
                         __le16 *ufilename = (__le16 *)filename;
-                        if(len == 2) {
+                        if (len == 2) {
                                 /* check for . */
-                                if(ufilename[0] == UNICODE_DOT)
+                                if (ufilename[0] == UNICODE_DOT)
                                         rc = 1;
-                        } else if(len == 4) {
+                        } else if (len == 4) {
                                 /* check for .. */
-                                if((ufilename[0] == UNICODE_DOT)
+                                if ((ufilename[0] == UNICODE_DOT)
                                    &&(ufilename[1] == UNICODE_DOT))
                                         rc = 2;
                         }
                 } else /* ASCII */ {
-                        if(len == 1) {
-                                if(filename[0] == '.') 
+                        if (len == 1) {
+                                if (filename[0] == '.') 
                                         rc = 1;
-                        } else if(len == 2) {
-                                if((filename[0] == '.') && (filename[1] == '.')) 
+                        } else if (len == 2) {
+                                if((filename[0] == '.') && (filename[1] == '.'))
                                         rc = 2;
                         }
                 }
@@ -638,7 +643,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
         struct cifsFileInfo * cifsFile = file->private_data;
         /* check if index in the buffer */
         
-        if((cifsFile == NULL) || (ppCurrentEntry == NULL) || 
+        if ((cifsFile == NULL) || (ppCurrentEntry == NULL) || 
            (num_to_ret == NULL))
                 return -ENOENT;
         
@@ -656,7 +661,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 #ifdef CONFIG_CIFS_DEBUG2
         dump_cifs_file_struct(file, "In fce ");
 #endif
-        if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) && 
+        if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) && 
              is_dir_changed(file)) || 
            (index_to_find < first_entry_in_buffer)) {
                 /* close and restart search */
@@ -665,9 +670,9 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
                 kfree(cifsFile->search_resume_name);
                 cifsFile->search_resume_name = NULL;
-                if(cifsFile->srch_inf.ntwrk_buf_start) {
+                if (cifsFile->srch_inf.ntwrk_buf_start) {
                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
-                        if(cifsFile->srch_inf.smallBuf)
+                        if (cifsFile->srch_inf.smallBuf)
                                 cifs_small_buf_release(cifsFile->srch_inf.
                                                 ntwrk_buf_start);
                         else
@@ -675,7 +680,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
                                                 ntwrk_buf_start);
                 }
                 rc = initiate_cifs_search(xid,file);
-                if(rc) {
+                if (rc) {
                         cFYI(1,("error %d reinitiating a search on rewind",rc));
                         return rc;
                 }
@@ -686,10 +691,10 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
                 cFYI(1,("calling findnext2"));
                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, 
                                   &cifsFile->srch_inf);
-                if(rc)
+                if (rc)
                         return -ENOENT;
         }
-        if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
+        if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
                 /* we found the buffer that contains the entry */
                 /* scan and find it */
                 int i;