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adfs: add hexadecimal filetype suffix option 

ADFS (FileCore) storage complies with the RISC OS filetype specification
(12 bits of file type information is stored in the file load address,
rather than using a file extension).  The existing driver largely ignores
this information and does not present it to the end user.

It is desirable that stored filetypes be made visible to the end user to
facilitate a precise copy of data and metadata from a hard disc (or image
thereof) into a RISC OS emulator (such as RPCEmu) or to a network share
which can be accessed by real Acorn systems.

This patch implements a per-mount filetype suffix option (use -o
ftsuffix=1) to present any filetype as a ,xyz hexadecimal suffix on each
file.  This type suffix is compatible with that used by RISC OS systems
that access network servers using NFS client software and by RPCemu's host
filing system.

Signed-off-by: Stuart Swales <stuart.swales.croftnuisk@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stuart Swales 2011-03-22 16:35:06 -07:00 committed by Linus Torvalds
parent 7a9730af9c
commit da23ef0549
6 changed files with 99 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/filesystems/adfs.txt
View File

@ -9,6 +9,9 @@ Mount options for ADFS
will be nnn. Default 0700.
othmask=nnn The permission mask for ADFS 'other' permissions
will be nnn. Default 0077.
ftsuffix=n When ftsuffix=0, no file type suffix will be applied.
When ftsuffix=1, a hexadecimal suffix corresponding to
the RISC OS file type will be added. Default 0.
Mapping of ADFS permissions to Linux permissions
------------------------------------------------
@ -55,3 +58,18 @@ Mapping of ADFS permissions to Linux permissions
You can therefore tailor the permission translation to whatever you
desire the permissions should be under Linux.
RISC OS file type suffix
------------------------
RISC OS file types are stored in bits 19..8 of the file load address.
To enable non-RISC OS systems to be used to store files without losing
file type information, a file naming convention was devised (initially
for use with NFS) such that a hexadecimal suffix of the form ,xyz
denoted the file type: e.g. BasicFile,ffb is a BASIC (0xffb) file. This
naming convention is now also used by RISC OS emulators such as RPCEmu.
Mounting an ADFS disc with option ftsuffix=1 will cause appropriate file
type suffixes to be appended to file names read from a directory. If the
ftsuffix option is zero or omitted, no file type suffixes will be added.

21
fs/adfs/adfs.h
View File

@ -50,6 +50,7 @@ struct adfs_sb_info {
gid_t s_gid; /* owner gid */
umode_t s_owner_mask; /* ADFS owner perm -> unix perm */
umode_t s_other_mask; /* ADFS other perm -> unix perm */
int s_ftsuffix; /* ,xyz hex filetype suffix option */
__u32 s_ids_per_zone; /* max. no ids in one zone */
__u32 s_idlen; /* length of ID in map */
@ -93,7 +94,7 @@ struct adfs_dir {
/*
* This is the overall maximum name length
*/
#define ADFS_MAX_NAME_LEN 256
#define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */
struct object_info {
__u32 parent_id; /* parent object id */
__u32 file_id; /* object id */
@ -101,10 +102,26 @@ struct object_info {
__u32 execaddr; /* execution address */
__u32 size; /* size */
__u8 attr; /* RISC OS attributes */
unsigned char name_len; /* name length */
unsigned int name_len; /* name length */
char name[ADFS_MAX_NAME_LEN];/* file name */
/* RISC OS file type (12-bit: derived from loadaddr) */
__u16 filetype;
};
/* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */
static inline int append_filetype_suffix(char *buf, __u16 filetype)
{
if (filetype == -1)
return 0;
*buf++ = ',';
*buf++ = hex_asc_lo(filetype >> 8);
*buf++ = hex_asc_lo(filetype >> 4);
*buf++ = hex_asc_lo(filetype >> 0);
return 4;
}
struct adfs_dir_ops {
int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir);
int (*setpos)(struct adfs_dir *dir, unsigned int fpos);

23
fs/adfs/dir_f.c
View File

@ -52,7 +52,6 @@ static inline int adfs_readname(char *buf, char *ptr, int maxlen)
*buf++ = *ptr;
ptr++;
}
*buf = '\0';
return buf - old_buf;
}
@ -208,7 +207,8 @@ adfs_dir_read(struct super_block *sb, unsigned long object_id,
* convert a disk-based directory entry to a Linux ADFS directory entry
*/
static inline void
adfs_dir2obj(struct object_info *obj, struct adfs_direntry *de)
adfs_dir2obj(struct adfs_dir *dir, struct object_info *obj,
struct adfs_direntry *de)
{
obj->name_len = adfs_readname(obj->name, de->dirobname, ADFS_F_NAME_LEN);
obj->file_id = adfs_readval(de->dirinddiscadd, 3);
@ -216,6 +216,23 @@ adfs_dir2obj(struct object_info *obj, struct adfs_direntry *de)
obj->execaddr = adfs_readval(de->direxec, 4);
obj->size = adfs_readval(de->dirlen, 4);
obj->attr = de->newdiratts;
obj->filetype = -1;
/*
* object is a file and is filetyped and timestamped?
* RISC OS 12-bit filetype is stored in load_address[19:8]
*/
if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
(0xfff00000 == (0xfff00000 & obj->loadaddr))) {
obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
/* optionally append the ,xyz hex filetype suffix */
if (ADFS_SB(dir->sb)->s_ftsuffix)
obj->name_len +=
append_filetype_suffix(
&obj->name[obj->name_len],
obj->filetype);
}
}
/*
@ -260,7 +277,7 @@ __adfs_dir_get(struct adfs_dir *dir, int pos, struct object_info *obj)
if (!de.dirobname[0])
return -ENOENT;
adfs_dir2obj(obj, &de);
adfs_dir2obj(dir, obj, &de);
return 0;
}

18
fs/adfs/dir_fplus.c
View File

@ -197,6 +197,24 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_info *obj)
if (obj->name[i] == '/')
obj->name[i] = '.';
obj->filetype = -1;
/*
* object is a file and is filetyped and timestamped?
* RISC OS 12-bit filetype is stored in load_address[19:8]
*/
if ((0 == (obj->attr & ADFS_NDA_DIRECTORY)) &&
(0xfff00000 == (0xfff00000 & obj->loadaddr))) {
obj->filetype = (__u16) ((0x000fff00 & obj->loadaddr) >> 8);
/* optionally append the ,xyz hex filetype suffix */
if (ADFS_SB(dir->sb)->s_ftsuffix)
obj->name_len +=
append_filetype_suffix(
&obj->name[obj->name_len],
obj->filetype);
}
dir->pos += 1;
ret = 0;
out:

22
fs/adfs/inode.c
View File

@ -78,26 +78,13 @@ static const struct address_space_operations adfs_aops = {
.bmap = _adfs_bmap
};
static inline unsigned int
adfs_filetype(struct inode *inode)
{
unsigned int type;
if (ADFS_I(inode)->stamped)
type = (ADFS_I(inode)->loadaddr >> 8) & 0xfff;
else
type = (unsigned int) -1;
return type;
}
/*
* Convert ADFS attributes and filetype to Linux permission.
*/
static umode_t
adfs_atts2mode(struct super_block *sb, struct inode *inode)
{
unsigned int filetype, attr = ADFS_I(inode)->attr;
unsigned int attr = ADFS_I(inode)->attr;
umode_t mode, rmask;
struct adfs_sb_info *asb = ADFS_SB(sb);
@ -106,9 +93,7 @@ adfs_atts2mode(struct super_block *sb, struct inode *inode)
return S_IFDIR | S_IXUGO | mode;
}
filetype = adfs_filetype(inode);
switch (filetype) {
switch (ADFS_I(inode)->filetype) {
case 0xfc0: /* LinkFS */
return S_IFLNK|S_IRWXUGO;
@ -277,7 +262,8 @@ adfs_iget(struct super_block *sb, struct object_info *obj)
ADFS_I(inode)->loadaddr = obj->loadaddr;
ADFS_I(inode)->execaddr = obj->execaddr;
ADFS_I(inode)->attr = obj->attr;
ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
ADFS_I(inode)->filetype = obj->filetype;
ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
inode->i_mode = adfs_atts2mode(sb, inode);
adfs_adfs2unix_time(&inode->i_mtime, inode);

23
fs/adfs/super.c
View File

@ -138,17 +138,20 @@ static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt)
seq_printf(seq, ",ownmask=%o", asb->s_owner_mask);
if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK)
seq_printf(seq, ",othmask=%o", asb->s_other_mask);
if (asb->s_ftsuffix != 0)
seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix);
return 0;
}
enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_err};
enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err};
static const match_table_t tokens = {
{Opt_uid, "uid=%u"},
{Opt_gid, "gid=%u"},
{Opt_ownmask, "ownmask=%o"},
{Opt_othmask, "othmask=%o"},
{Opt_ftsuffix, "ftsuffix=%u"},
{Opt_err, NULL}
};
@ -189,6 +192,11 @@ static int parse_options(struct super_block *sb, char *options)
return -EINVAL;
asb->s_other_mask = option;
break;
case Opt_ftsuffix:
if (match_int(args, &option))
return -EINVAL;
asb->s_ftsuffix = option;
break;
default:
printk("ADFS-fs: unrecognised mount option \"%s\" "
"or missing value\n", p);
@ -366,6 +374,7 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
asb->s_gid = 0;
asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK;
asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK;
asb->s_ftsuffix = 0;
if (parse_options(sb, data))
goto error;
@ -445,11 +454,13 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root);
root_obj.name_len = 0;
root_obj.loadaddr = 0;
root_obj.execaddr = 0;
/* Set root object date as 01 Jan 1987 00:00:00 */
root_obj.loadaddr = 0xfff0003f;
root_obj.execaddr = 0xec22c000;
root_obj.size = ADFS_NEWDIR_SIZE;
root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ |
ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ;
root_obj.filetype = -1;
/*
* If this is a F+ disk with variable length directories,
@ -463,6 +474,12 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent)
asb->s_dir = &adfs_f_dir_ops;
asb->s_namelen = ADFS_F_NAME_LEN;
}
/*
* ,xyz hex filetype suffix may be added by driver
* to files that have valid RISC OS filetype
*/
if (asb->s_ftsuffix)
asb->s_namelen += 4;
sb->s_d_op = &adfs_dentry_operations;
root = adfs_iget(sb, &root_obj);