[CIFS] Add mount option for disabling sending byte range lock requests

over the wire (to help the case when applications break with cifs mandatory
lock behavior.  Add part one of mount option for requesting case
insensitive path name matching.

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

fs/cifs/CHANGES

+Version 1.36
+------------
+Add mount option for disabling the default behavior of sending byte range lock
+requests to the server (necessary for certain applications which break with
+mandatory lock behavior such as Evolution), and also mount option for
+requesting case insensitive matching for path based requests (requesting
+case sensitive is the default).
+
 Version 1.35
 ------------
 Add writepage performance improvements.  Fix path name conversions

fs/cifs/README

@@ -407,6 +407,13 @@ A partial list of the supported mount options follows:
 		This has no effect if the server does not support
 		Unicode on the wire.
  nomapchars     Do not translate any of these seven characters (default).
+ nocase         Request case insensitive path name matching (case
+		sensitive is the default if the server suports it).
+ nobrl          Do not send byte range lock requests to the server.
+		This is necessary for certain applications that break
+		with cifs style mandatory byte range locks (and most
+		cifs servers do not yet support requesting advisory
+		byte range locks).
  remount        remount the share (often used to change from ro to rw mounts
 	        or vice versa)
 		

fs/cifs/cifs_fs_sb.h

@@ -26,6 +26,8 @@
 #define CIFS_MOUNT_MAP_SPECIAL_CHR 0x20 /* remap illegal chars in filenames */
 #define CIFS_MOUNT_POSIX_PATHS 0x40 /* Negotiate posix pathnames if possible. */
 #define CIFS_MOUNT_UNX_EMUL    0x80 /* Network compat with SFUnix emulation */
+#define CIFS_MOUNT_CASE_INSENS  0x100 /* Request case insenstive searches */
+#define CIFS_MOUNT_NO_BRL	0x200 /* No sending byte range locks to srv */
 
 struct cifs_sb_info {
 	struct cifsTconInfo *tcon;	/* primary mount */

fs/cifs/cifsfs.h

@@ -96,5 +96,5 @@ extern ssize_t	cifs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t	cifs_listxattr(struct dentry *, char *, size_t);
 extern int cifs_ioctl (struct inode * inode, struct file * filep,
 		       unsigned int command, unsigned long arg);
-#define CIFS_VERSION   "1.35"
+#define CIFS_VERSION   "1.36"
 #endif				/* _CIFSFS_H */

fs/cifs/connect.c

@@ -79,6 +79,8 @@ struct smb_vol {
 	unsigned remap:1;   /* set to remap seven reserved chars in filenames */
 	unsigned posix_paths:1;   /* unset to not ask for posix pathnames. */
 	unsigned sfu_emul:1;
+	unsigned nocase;     /* request case insensitive filenames */
+	unsigned nobrl;      /* disable sending byte range locks to srv */
 	unsigned int rsize;
 	unsigned int wsize;
 	unsigned int sockopt;
@@ -1040,6 +1042,12 @@ cifs_parse_mount_options(char *options, const char *devname,struct smb_vol *vol)
 			vol->posix_paths = 1;
 		} else if (strnicmp(data, "noposixpaths", 12) == 0) {
 			vol->posix_paths = 0;
+                } else if (strnicmp(data, "nocase", 6) == 0) {
+                        vol->nocase = 1;
+		} else if (strnicmp(data, "brl", 3) == 0) {
+			vol->nobrl =  0;
+		} else if (strnicmp(data, "nobrl", 5) == 0) {
+			vol->nobrl =  1;
 		} else if (strnicmp(data, "setuids", 7) == 0) {
 			vol->setuids = 1;
 		} else if (strnicmp(data, "nosetuids", 9) == 0) {
@@ -1699,9 +1707,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
 		if(volume_info.sfu_emul)
 			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
+		if(volume_info.nocase)
+			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CASE_INSENS;
+		if(volume_info.nobrl)
+			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
 
 		if(volume_info.direct_io) {
-			cERROR(1,("mounting share using direct i/o"));
+			cFYI(1,("mounting share using direct i/o"));
 			cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
 		}
 

fs/cifs/inode.c

@@ -166,6 +166,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 				inode->i_fop = &cifs_file_direct_ops;
 			else
 				inode->i_fop = &cifs_file_ops;
+			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+				inode->i_fop->lock = NULL;
 			inode->i_data.a_ops = &cifs_addr_ops;
 		} else if (S_ISDIR(inode->i_mode)) {
 			cFYI(1, (" Directory inode"));
@@ -369,6 +371,8 @@ int cifs_get_inode_info(struct inode **pinode,
 				inode->i_fop = &cifs_file_direct_ops;
 			else
 				inode->i_fop = &cifs_file_ops;
+			if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+				inode->i_fop->lock = NULL;
 			inode->i_data.a_ops = &cifs_addr_ops;
 		} else if (S_ISDIR(inode->i_mode)) {
 			cFYI(1, (" Directory inode "));

fs/cifs/readdir.c

@@ -194,6 +194,8 @@ static void fill_in_inode(struct inode *tmp_inode,
 			tmp_inode->i_fop = &cifs_file_direct_ops;
 		else
 			tmp_inode->i_fop = &cifs_file_ops;
+		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+			tmp_inode->i_fop->lock = NULL;
 		tmp_inode->i_data.a_ops = &cifs_addr_ops;
 
 		if(isNewInode)
@@ -298,6 +300,8 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
 			tmp_inode->i_fop = &cifs_file_direct_ops;
 		else
 			tmp_inode->i_fop = &cifs_file_ops;
+		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+			tmp_inode->i_fop->lock = NULL;
 		tmp_inode->i_data.a_ops = &cifs_addr_ops;
 
 		if(isNewInode)
@@ -557,7 +561,6 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 		char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + 
 			smbCalcSize((struct smb_hdr *)
 				cifsFile->srch_inf.ntwrk_buf_start);
-/*	dump_cifs_file_struct(file,"found entry in fce "); */
 		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;
@@ -595,7 +598,6 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 		*num_to_ret = 0;
 	} else
 		*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
-/*	dump_cifs_file_struct(file, "end fce ");*/
 
 	return rc;
 }
@@ -815,14 +817,12 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 		FreeXid(xid);
 		return -EIO;
 	}
-/*	dump_cifs_file_struct(file, "Begin rdir "); */
 
 	cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 	pTcon = cifs_sb->tcon;
 	if(pTcon == NULL)
 		return -EINVAL;
 
-/*	cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
 
 	switch ((int) file->f_pos) {
 	case 0:
@@ -876,7 +876,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 		cifsFile->search_resume_name = NULL; */
 
 		/* BB account for . and .. in f_pos as special case */
-		/* dump_cifs_file_struct(file, "rdir after default ");*/
 
 		rc = find_cifs_entry(xid,pTcon, file,
 				&current_entry,&num_to_fill);
@@ -924,7 +923,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 	} /* end switch */
 
 rddir2_exit:
-	/* dump_cifs_file_struct(file, "end rdir ");  */
 	FreeXid(xid);
 	return rc;
 }