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authorSteve French <smfrench@gmail.com>2014-09-25 20:20:05 +0200
committerSteve French <smfrench@gmail.com>2014-10-16 22:20:20 +0200
commitb693855fe67314d501aae74b9adff8788eb2fd82 (patch)
treeae47f2dd9b4c4fb73c6592d22916416cdd3f4871 /fs/cifs/cifs_unicode.h
parentmfsymlinks support for SMB2.1/SMB3. Part 2 query symlink (diff)
downloadlinux-b693855fe67314d501aae74b9adff8788eb2fd82.tar.xz
linux-b693855fe67314d501aae74b9adff8788eb2fd82.zip
Allow conversion of characters in Mac remap range. Part 1
This allows directory listings to Mac to display filenames correctly which have been created with illegal (to Windows) characters in their filename. It does not allow converting the other direction yet ie opening files with these characters (followon patch). There are seven reserved characters that need to be remapped when mounting to Windows, Mac (or any server without Unix Extensions) which are valid in POSIX but not in the other OS. : \ < > ? * | We used the normal UCS-2 remap range for this in order to convert this to/from UTF8 as did Windows Services for Unix (basically add 0xF000 to any of the 7 reserved characters), at least when the "mapchars" mount option was specified. Mac used a very slightly different "Services for Mac" remap range 0xF021 through 0xF027. The attached patch allows cifs.ko (the kernel client) to read directories on macs containing files with these characters and display their names properly. In theory this even might be useful on mounts to Samba when the vfs_catia or new "vfs_fruit" module is loaded. Currently the 7 reserved characters look very strange in directory listings from cifs.ko to Mac server. This patch allows these file name characters to be read (requires specifying mapchars on mount). Two additional changes are needed: 1) Make it more automatic: a way of detecting enough info so that we know to try to always remap these characters or not. Various have suggested that the SFM approach be made the default when the server does not support POSIX Unix extensions (cifs mounts to Samba for example) so need to make SFM remapping the default unless mapchars (SFU style mapping) specified on mount or no mapping explicitly requested or no mapping needed (cifs mounts to Samba). 2) Adding a patch to map the characters the other direction (ie UTF-8 to UCS-2 on open). This patch does it for translating readdir entries (ie UCS-2 to UTF-8) Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Diffstat (limited to 'fs/cifs/cifs_unicode.h')
-rw-r--r--fs/cifs/cifs_unicode.h30
1 files changed, 29 insertions, 1 deletions
diff --git a/fs/cifs/cifs_unicode.h b/fs/cifs/cifs_unicode.h
index d8eac3b6cefb..30af32b55a94 100644
--- a/fs/cifs/cifs_unicode.h
+++ b/fs/cifs/cifs_unicode.h
@@ -52,6 +52,34 @@
#define UNI_PIPE (__u16) ('|' + 0xF000)
#define UNI_SLASH (__u16) ('\\' + 0xF000)
+/*
+ * Macs use an older "SFM" mapping of the symbols above. Fortunately it does
+ * not conflict (although almost does) with the mapping above.
+ */
+
+#define SFM_ASTERISK ((__u16) 0xF021)
+#define SFM_QUESTION ((__u16) 0xF025)
+#define SFM_COLON ((__u16) 0xF022)
+#define SFM_GRTRTHAN ((__u16) 0xF024)
+#define SFM_LESSTHAN ((__u16) 0xF023)
+#define SFM_PIPE ((__u16) 0xF027)
+#define SFM_SLASH ((__u16) 0xF026)
+
+/*
+ * Mapping mechanism to use when one of the seven reserved characters is
+ * encountered. We can only map using one of the mechanisms at a time
+ * since otherwise readdir could return directory entries which we would
+ * not be able to open
+ *
+ * NO_MAP_UNI_RSVD = do not perform any remapping of the character
+ * SFM_MAP_UNI_RSVD = map reserved characters using SFM scheme (MAC compatible)
+ * SFU_MAP_UNI_RSVD = map reserved characters ala SFU ("mapchars" option)
+ *
+ */
+#define NO_MAP_UNI_RSVD 0
+#define SFM_MAP_UNI_RSVD 1
+#define SFU_MAP_UNI_RSVD 2
+
/* Just define what we want from uniupr.h. We don't want to define the tables
* in each source file.
*/
@@ -75,7 +103,7 @@ extern const struct UniCaseRange CifsUniLowerRange[];
#ifdef __KERNEL__
int cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
- const struct nls_table *codepage, bool mapchar);
+ const struct nls_table *cp, int map_type);
int cifs_utf16_bytes(const __le16 *from, int maxbytes,
const struct nls_table *codepage);
int cifs_strtoUTF16(__le16 *, const char *, int, const struct nls_table *);