/*
* parse the mount options
* - this function has been shamelessly adapted from the ext3 fs which
* shamelessly adapted it from the msdos fs
*/
static int afs_parse_options(struct afs_mount_params *params,
char *options, const char **devname)
{
struct afs_cell *cell;
substring_t args[MAX_OPT_ARGS];
char *p;
int token;
_enter("%s", options);
options[PAGE_SIZE - 1] = 0;
while ((p = strsep(&options, ","))) {
if (!*p)
continue;
token = match_token(p, afs_options_list, args);
switch (token) {
case afs_opt_cell:
cell = afs_cell_lookup(args[0].from,
args[0].to - args[0].from,
false);
if (IS_ERR(cell))
return PTR_ERR(cell);
afs_put_cell(params->cell);
params->cell = cell;
break;
case afs_opt_rwpath:
params->rwpath = 1;
break;
case afs_opt_vol:
*devname = args[0].from;
break;
case afs_opt_autocell:
params->autocell = 1;
break;
default:
printk(KERN_ERR "kAFS:"
" Unknown or invalid mount option: '%s'\n", p);
return -EINVAL;
}
}
_leave(" = 0");
return 0;
}
/*
* parse a device name to get cell name, volume name, volume type and R/W
* selector
* - this can be one of the following:
* "%[cell:]volume[.]" R/W volume
* "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
* or R/W (rwpath=1) volume
* "%[cell:]volume.readonly" R/O volume
* "#[cell:]volume.readonly" R/O volume
* "%[cell:]volume.backup" Backup volume
* "#[cell:]volume.backup" Backup volume
*/
static int afs_parse_device_name(struct afs_mount_params *params,
const char *name)
{
struct afs_cell *cell;
const char *cellname, *suffix;
int cellnamesz;
_enter(",%s", name);
if (!name) {
printk(KERN_ERR "kAFS: no volume name specified\n");
return -EINVAL;
}
if ((name[0] != '%' && name[0] != '#') || !name[1]) {
printk(KERN_ERR "kAFS: unparsable volume name\n");
return -EINVAL;
}
/* determine the type of volume we're looking for */
params->type = AFSVL_ROVOL;
params->force = false;
if (params->rwpath || name[0] == '%') {
params->type = AFSVL_RWVOL;
params->force = true;
}
name++;
/* split the cell name out if there is one */
params->volname = strchr(name, ':');
if (params->volname) {
cellname = name;
cellnamesz = params->volname - name;
params->volname++;
} else {
params->volname = name;
cellname = NULL;
cellnamesz = 0;
}
/* the volume type is further affected by a possible suffix */
suffix = strrchr(params->volname, '.');
if (suffix) {
if (strcmp(suffix, ".readonly") == 0) {
params->type = AFSVL_ROVOL;
params->force = true;
} else if (strcmp(suffix, ".backup") == 0) {
params->type = AFSVL_BACKVOL;
params->force = true;
} else if (suffix[1] == 0) {
} else {
suffix = NULL;
}
}
params->volnamesz = suffix ?
suffix - params->volname : strlen(params->volname);
_debug("cell %*.*s [%p]",
cellnamesz, cellnamesz, cellname ?: "", params->cell);
/* lookup the cell record */
if (cellname || !params->cell) {
cell = afs_cell_lookup(cellname, cellnamesz, true);
if (IS_ERR(cell)) {
printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
cellnamesz, cellnamesz, cellname ?: "");
return PTR_ERR(cell);
}
afs_put_cell(params->cell);
params->cell = cell;
}
/*
* lookup a volume by name
* - this can be one of the following:
* "%[cell:]volume[.]" R/W volume
* "#[cell:]volume[.]" R/O or R/W volume (rwparent=0),
* or R/W (rwparent=1) volume
* "%[cell:]volume.readonly" R/O volume
* "#[cell:]volume.readonly" R/O volume
* "%[cell:]volume.backup" Backup volume
* "#[cell:]volume.backup" Backup volume
*
* The cell name is optional, and defaults to the current cell.
*
* See "The Rules of Mount Point Traversal" in Chapter 5 of the AFS SysAdmin
* Guide
* - Rule 1: Explicit type suffix forces access of that type or nothing
* (no suffix, then use Rule 2 & 3)
* - Rule 2: If parent volume is R/O, then mount R/O volume by preference, R/W
* if not available
* - Rule 3: If parent volume is R/W, then only mount R/W volume unless
* explicitly told otherwise
*/
int afs_volume_lookup(const char *name, struct afs_cell *cell, int rwpath,
struct afs_volume **_volume)
{
struct afs_vlocation *vlocation = NULL;
struct afs_volume *volume = NULL;
afs_voltype_t type;
const char *cellname, *volname, *suffix;
char srvtmask;
int force, ret, loop, cellnamesz, volnamesz;
_enter("%s,,%d,", name, rwpath);
if (!name || (name[0] != '%' && name[0] != '#') || !name[1]) {
printk("kAFS: unparsable volume name\n");
return -EINVAL;
}
/* determine the type of volume we're looking for */
force = 0;
type = AFSVL_ROVOL;
if (rwpath || name[0] == '%') {
type = AFSVL_RWVOL;
force = 1;
}
suffix = strrchr(name, '.');
if (suffix) {
if (strcmp(suffix, ".readonly") == 0) {
type = AFSVL_ROVOL;
force = 1;
}
else if (strcmp(suffix, ".backup") == 0) {
type = AFSVL_BACKVOL;
force = 1;
}
else if (suffix[1] == 0) {
}
else {
suffix = NULL;
}
}
/* split the cell and volume names */
name++;
volname = strchr(name, ':');
if (volname) {
cellname = name;
cellnamesz = volname - name;
volname++;
}
else {
volname = name;
cellname = NULL;
cellnamesz = 0;
}
volnamesz = suffix ? suffix - volname : strlen(volname);
_debug("CELL:%*.*s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
cellnamesz, cellnamesz, cellname ?: "", cell,
volnamesz, volnamesz, volname, suffix ?: "-",
type,
force ? " FORCE" : "");
/* lookup the cell record */
if (cellname || !cell) {
ret = afs_cell_lookup(cellname, cellnamesz, &cell);
if (ret<0) {
printk("kAFS: unable to lookup cell '%s'\n",
cellname ?: "");
goto error;
}
