[CIFS] Add support for readdir to legacy servers

Fixes oops to OS/2 on ls and removes redundant NTCreateX calls to servers
which do not support NT SMBs.  Key operations to OS/2 work.

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

1 files changed, 109 insertions, 41 deletions

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index e3e762d774df..03bbcb377913 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -109,32 +109,52 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
         return rc;
 }
 
-static void fill_in_inode(struct inode *tmp_inode,
-        FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
+static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
+                char * buf, int *pobject_type, int isNewInode)
 {
         loff_t local_size;
         struct timespec local_mtime;
 
         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
-        __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
-        __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
-        __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
-
-        cifsInfo->cifsAttrs = attr;
-        cifsInfo->time = jiffies;
+        __u32 attr;
+        __u64 allocation_size;
+        __u64 end_of_file;
 
         /* save mtime and size */
         local_mtime = tmp_inode->i_mtime;
         local_size  = tmp_inode->i_size;
 
+        if(new_buf_type) {
+                FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
+
+                attr = le32_to_cpu(pfindData->ExtFileAttributes);
+                allocation_size = le64_to_cpu(pfindData->AllocationSize);
+                end_of_file = le64_to_cpu(pfindData->EndOfFile);
+                tmp_inode->i_atime =
+                      cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
+                tmp_inode->i_mtime =
+                      cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
+                tmp_inode->i_ctime =
+                      cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
+        } else { /* legacy, OS2 and DOS style */
+                FIND_FILE_STANDARD_INFO * pfindData = 
+                        (FIND_FILE_STANDARD_INFO *)buf;
+
+                attr = le16_to_cpu(pfindData->Attributes);
+                allocation_size = le32_to_cpu(pfindData->AllocationSize);
+                end_of_file = le32_to_cpu(pfindData->DataSize);
+                tmp_inode->i_atime = CURRENT_TIME;
+                /* tmp_inode->i_mtime =  BB FIXME - add dos time handling
+                tmp_inode->i_ctime = 0;   BB FIXME */
+
+        }
+
         /* Linux can not store file creation time unfortunately so ignore it */
-        tmp_inode->i_atime =
-            cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
-        tmp_inode->i_mtime =
-            cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
-        tmp_inode->i_ctime =
-            cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
+
+        cifsInfo->cifsAttrs = attr;
+        cifsInfo->time = jiffies;
+
         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
         /* 2767 perms - indicate mandatory locking */
                 /* BB fill in uid and gid here? with help from winbind? 
@@ -420,7 +440,10 @@ static int initiate_cifs_search(const int xid, struct file *file)
 ffirst_retry:
         /* test for Unix extensions */
         if (pTcon->ses->capabilities & CAP_UNIX) {
-                cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
+                cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
+        } else if ((pTcon->ses->capabilities & 
+                        (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
+                cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
         } else /* not srvinos - BB fixme add check for backlevel? */ {
@@ -456,12 +479,19 @@ static int cifs_unicode_bytelen(char *str)
         return len << 1;
 }
 
-static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
+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;
 
-        new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
+        if(level == SMB_FIND_FILE_INFO_STANDARD) {
+                FIND_FILE_STANDARD_INFO * pfData;
+                pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
+
+                new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
+                                pfData->FileNameLength;
+        } else
+                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) {
@@ -469,7 +499,10 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
                       ("search entry %p began after end of SMB %p old entry %p",
                         new_entry, end_of_smb, old_entry)); 
                 return NULL;
-        } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
+        } 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)))  {
                 cERROR(1,("search entry %p extends after end of SMB %p",
                         new_entry, end_of_smb));
                 return NULL;
@@ -487,7 +520,7 @@ static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
         char * filename = NULL;
         int len = 0; 
 
-        if(cfile->srch_inf.info_level == 0x202) {
+        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) {
@@ -496,26 +529,34 @@ static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
                         /* BB should we make this strnlen of PATH_MAX? */
                         len = strnlen(filename, 5);
                 }
-        } else if(cfile->srch_inf.info_level == 0x101) {
+        } 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 == 0x102) {
+        } 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 == 0x105) {
+        } 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 == 0x104) {
+        } 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) {
+                FIND_FILE_STANDARD_INFO * pFindData =
+                        (FIND_FILE_STANDARD_INFO *)current_entry;
+                filename = &pFindData->FileName[0];
+                len = le32_to_cpu(pFindData->FileNameLength);
         } else {
                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
         }
@@ -651,10 +692,12 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
                                         - cifsFile->srch_inf.entries_in_buffer;
                 pos_in_buf = index_to_find - first_entry_in_buffer;
-                cFYI(1,("found entry - pos_in_buf %d",pos_in_buf)); 
+                cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
+
                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
                         /* go entry by entry figuring out which is first */
-                        current_entry = nxt_dir_entry(current_entry,end_of_smb);
+                        current_entry = nxt_dir_entry(current_entry,end_of_smb,
+                                                cifsFile->srch_inf.info_level);
                 }
                 if((current_entry == NULL) && (i < pos_in_buf)) {
                         /* BB fixme - check if we should flag this error */
@@ -681,7 +724,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 /* inode num, inode type and filename returned */
 static int cifs_get_name_from_search_buf(struct qstr *pqst,
         char *current_entry, __u16 level, unsigned int unicode,
-        struct cifs_sb_info * cifs_sb, ino_t *pinum)
+        struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
 {
         int rc = 0;
         unsigned int len = 0;
@@ -725,10 +768,22 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
+        } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
+                FIND_FILE_STANDARD_INFO * pFindData =
+                        (FIND_FILE_STANDARD_INFO *)current_entry;
+                filename = &pFindData->FileName[0];
+                /* one byte length, no name conversion */
+                len = (unsigned int)pFindData->FileNameLength;
         } else {
                 cFYI(1,("Unknown findfirst level %d",level));
                 return -EINVAL;
         }
+
+        if(len > max_len) {
+                cERROR(1,("bad search response length %d past smb end", len));
+                return -EINVAL;
+        }
+
         if(unicode) {
                 /* BB fixme - test with long names */
                 /* Note converted filename can be longer than in unicode */
@@ -748,7 +803,7 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
 }
 
 static int cifs_filldir(char *pfindEntry, struct file *file,
-        filldir_t filldir, void *direntry, char *scratch_buf)
+        filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
 {
         int rc = 0;
         struct qstr qstring;
@@ -784,6 +839,7 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
                         pCifsF->srch_inf.info_level,
                         pCifsF->srch_inf.unicode,cifs_sb,
+                        max_len,
                         &inum /* returned */);
 
         if(rc)
@@ -805,13 +861,16 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         /* we pass in rc below, indicating whether it is a new inode,
            so we can figure out whether to invalidate the inode cached
            data if the file has changed */
-        if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
+        if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
                 unix_fill_in_inode(tmp_inode,
-                                   (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
-        } else {
-                fill_in_inode(tmp_inode,
-                              (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
-        }
+                                   (FILE_UNIX_INFO *)pfindEntry,
+                                   &obj_type, rc);
+        else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
+                fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
+                                pfindEntry, &obj_type, rc);
+        else
+                fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
+        
         
         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
                      tmp_inode->i_ino,obj_type);
@@ -871,6 +930,12 @@ static int cifs_save_resume_key(const char *current_entry,
                 filename = &pFindData->FileName[0];
                 len = le32_to_cpu(pFindData->FileNameLength);
                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
+        } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
+                FIND_FILE_STANDARD_INFO * pFindData =
+                        (FIND_FILE_STANDARD_INFO *)current_entry;
+                filename = &pFindData->FileName[0];
+                /* one byte length, no name conversion */
+                len = (unsigned int)pFindData->FileNameLength;
         } else {
                 cFYI(1,("Unknown findfirst level %d",level));
                 return -EINVAL;
@@ -891,6 +956,7 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
         int num_to_fill = 0;
         char * tmp_buf = NULL;
         char * end_of_smb;
+        int max_len;
 
         xid = GetXid();
 
@@ -966,10 +1032,11 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
                         goto rddir2_exit;
                 }
                 cFYI(1,("loop through %d times filling dir for net buf %p",
-                        num_to_fill,cifsFile->srch_inf.ntwrk_buf_start)); 
-                end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
-                        smbCalcSize((struct smb_hdr *)
-                                    cifsFile->srch_inf.ntwrk_buf_start);
+                        num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
+                max_len = smbCalcSize((struct smb_hdr *)
+                                cifsFile->srch_inf.ntwrk_buf_start);
+                end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
+
                 /* To be safe - for UCS to UTF-8 with strings loaded
                 with the rare long characters alloc more to account for
                 such multibyte target UTF-8 characters. cifs_unicode.c,
@@ -984,8 +1051,8 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
                         }
                         /* if buggy server returns . and .. late do
                         we want to check for that here? */
-                        rc = cifs_filldir(current_entry, file, 
-                                        filldir, direntry,tmp_buf);
+                        rc = cifs_filldir(current_entry, file,
+                                        filldir, direntry, tmp_buf, max_len);
                         file->f_pos++;
                         if(file->f_pos == 
                                 cifsFile->srch_inf.index_of_last_entry) {
@@ -994,8 +1061,9 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
                                 cifs_save_resume_key(current_entry,cifsFile);
                                 break;
                         } else 
-                                current_entry = nxt_dir_entry(current_entry,
-                                                              end_of_smb);
+                                current_entry = 
+                                        nxt_dir_entry(current_entry, end_of_smb,
+                                                cifsFile->srch_inf.info_level);
                 }
                 kfree(tmp_buf);
                 break;