[CIFS] Add support for legacy servers part eight. Write fixes for Windows

ME, and do not set ctime unless explicitly requested with atime and/or
mtime (it gets thrown away by most servers anyway as there is no way to set
this via posix).

Signed-off-by: Steve French (sfrench@us.ibm.com)

4 files changed, 66 insertions, 31 deletions

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 8b55e56cf1fe..47ae68b51847 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -2,6 +2,8 @@ Version 1.37
 ------------
 Fix readdir caching when unlink removes file in current search buffer,
 and this is followed by a rewind search to just before the deleted entry.
+Do not attempt to set ctime unless atime and/or mtime change requested
+(most servers throw it away anyway).
 
 Version 1.36
 ------------
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 43fb2aafa528..f738c8b19e3b 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -256,7 +256,7 @@ cifs_alloc_inode(struct super_block *sb)
         cifs_inode->clientCanCacheAll = FALSE;
         cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
-
+        cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
         INIT_LIST_HEAD(&cifs_inode->openFileList);
         return &cifs_inode->vfs_inode;
 }
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 575b2281518d..f72a61df3c68 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1072,7 +1072,7 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
         if (bytes_sent > count)
                 bytes_sent = count;
         pSMB->DataOffset =
-            cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
+                cpu_to_le16(offsetof(struct smb_com_write_req,Data) - 4);
         if(buf)
             memcpy(pSMB->Data,buf,bytes_sent);
         else if(ubuf) {
@@ -1080,20 +1080,23 @@ CIFSSMBWrite(const int xid, struct cifsTconInfo *tcon,
                         cifs_buf_release(pSMB);
                         return -EFAULT;
                 }
-        } else {
+        } else if (count != 0) {
                 /* No buffer */
                 cifs_buf_release(pSMB);
                 return -EINVAL;
+        } /* else setting file size with write of zero bytes */
+        if(wct == 14)
+                byte_count = bytes_sent + 1; /* pad */
+        else /* wct == 12 */ {
+                byte_count = bytes_sent + 5; /* bigger pad, smaller smb hdr */
         }
-
-        byte_count = bytes_sent + 1 /* pad */ ; /* BB fix this for sends > 64K */
         pSMB->DataLengthLow = cpu_to_le16(bytes_sent & 0xFFFF);
         pSMB->DataLengthHigh = cpu_to_le16(bytes_sent >> 16);
-        pSMB->hdr.smb_buf_length += bytes_sent+1;
+        pSMB->hdr.smb_buf_length += byte_count;
 
         if(wct == 14)
                 pSMB->ByteCount = cpu_to_le16(byte_count);
-        else { /* old style write has byte count 4 bytes earlier */
+        else { /* old style write has byte count 4 bytes earlier so 4 bytes pad  */
                 struct smb_com_writex_req * pSMBW = 
                         (struct smb_com_writex_req *)pSMB;
                 pSMBW->ByteCount = cpu_to_le16(byte_count);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 6e82e1ae03b4..ca3af4eafcb2 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1030,14 +1030,15 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                                         /* now that we found one valid file
                                            handle no sense continuing to loop
                                            trying others, so break here */
-                                        /* if(rc == -EINVAL) {
+                                        if(rc == -EINVAL) {
                                                 int bytes_written;
                                                 rc = CIFSSMBWrite(xid, pTcon,
                                                         nfid, 0,
                                                         attrs->ia_size, 
-                                                        &bytes_written,
-                                                        NULL, NULL, long_op);
-                                        } */
+                                                        &bytes_written, NULL,
+                                                        NULL, 1 /* 45 sec */);
+                                                cFYI(1,("wrt seteof rc %d",rc));
+                                        }
                                         break;
                                 }
                         }
@@ -1055,14 +1056,30 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                                            cifs_sb->local_nls, 
                                            cifs_sb->mnt_cifs_flags &
                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
-                        cFYI(1, (" SetEOF by path (setattrs) rc = %d", rc));
-                        /* if(rc == -EINVAL)
-                                old_style_set_eof_via_write(xid, pTcon, 
-                                                full_path, 
-                                                attrs->ia_size,
-                                                cifs_sb->local_nls,
-                                                cifs_sb->mnt_cifs_flags &
-                                                  CIFS_MOUNT_MAP_SPECIAL_CHR);*/
+                        cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
+                        if(rc == -EINVAL) {
+                                __u16 netfid;
+                                int oplock = FALSE;
+
+                                rc = SMBLegacyOpen(xid, pTcon, full_path,
+                                        FILE_OPEN,
+                                        SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
+                                        CREATE_NOT_DIR, &netfid, &oplock,
+                                        NULL, cifs_sb->local_nls,
+                                        cifs_sb->mnt_cifs_flags &
+                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
+                                if (rc==0) {
+                                        int bytes_written;
+                                        rc = CIFSSMBWrite(xid, pTcon,
+                                                        netfid, 0,
+                                                        attrs->ia_size,
+                                                        &bytes_written, NULL,
+                                                        NULL, 1 /* 45 sec */);
+                                        cFYI(1,("wrt seteof rc %d",rc));
+                                        CIFSSMBClose(xid, pTcon, netfid);
+                                }
+
+                        }
                 }
 
                 /* Server is ok setting allocation size implicitly - no need
@@ -1075,24 +1092,22 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
                         cifs_truncate_page(direntry->d_inode->i_mapping,
                                            direntry->d_inode->i_size);
-                }
+                } else 
+                        goto cifs_setattr_exit;
         }
         if (attrs->ia_valid & ATTR_UID) {
-                cFYI(1, (" CIFS - UID changed to %d", attrs->ia_uid));
+                cFYI(1, ("UID changed to %d", attrs->ia_uid));
                 uid = attrs->ia_uid;
-                /* entry->uid = cpu_to_le16(attr->ia_uid); */
         }
         if (attrs->ia_valid & ATTR_GID) {
-                cFYI(1, (" CIFS - GID changed to %d", attrs->ia_gid));
+                cFYI(1, ("GID changed to %d", attrs->ia_gid));
                 gid = attrs->ia_gid;
-                /* entry->gid = cpu_to_le16(attr->ia_gid); */
         }
 
         time_buf.Attributes = 0;
         if (attrs->ia_valid & ATTR_MODE) {
-                cFYI(1, (" CIFS - Mode changed to 0x%x", attrs->ia_mode));
+                cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
                 mode = attrs->ia_mode;
-                /* entry->mode = cpu_to_le16(attr->ia_mode); */
         }
 
         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
@@ -1132,18 +1147,24 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
         } else
                 time_buf.LastWriteTime = 0;
-
-        if (attrs->ia_valid & ATTR_CTIME) {
+        /* Do not set ctime explicitly unless other time
+           stamps are changed explicitly (i.e. by utime()
+           since we would then have a mix of client and
+           server times */
+           
+        if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
                 set_time = TRUE;
-                cFYI(1, (" CIFS - CTIME changed ")); /* BB probably no need */
+                /* Although Samba throws this field away
+                it may be useful to Windows - but we do
+                not want to set ctime unless some other
+                timestamp is changing */
+                cFYI(1, ("CIFS - CTIME changed "));
                 time_buf.ChangeTime =
                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
         } else
                 time_buf.ChangeTime = 0;
 
         if (set_time || time_buf.Attributes) {
-                /* BB what if setting one attribute fails (such as size) but
-                   time setting works? */
                 time_buf.CreationTime = 0;      /* do not change */
                 /* In the future we should experiment - try setting timestamps
                    via Handle (SetFileInfo) instead of by path */
@@ -1182,12 +1203,21 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                                         &time_buf, cifs_sb->local_nls); */
                         }
                 }
+                /* Even if error on time set, no sense failing the call if
+                the server would set the time to a reasonable value anyway,
+                and this check ensures that we are not being called from
+                sys_utimes in which case we ought to fail the call back to
+                the user when the server rejects the call */
+                if((rc) && (attrs->ia_valid &&
+                         (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
+                        rc = 0;
         }
 
         /* do not need local check to inode_check_ok since the server does
            that */
         if (!rc)
                 rc = inode_setattr(direntry->d_inode, attrs);
+cifs_setattr_exit:
         kfree(full_path);
         FreeXid(xid);
         return rc;