/******************************************************************************
*
* parse_axfs_options
*
* Description:
* Parses the mount -o options specific to axfs
*
* Parameters:
* (IN) options - mount -o options
*
* (OUT) secondary_blk_dev - name of the block device containing part of
* image
*
* (OUT) physaddr - the physical address
*
* (OUT) virtaddr - the virtual address
*
* Returns:
* pointer to a axfs_file_super_info or an error pointer
*
*****************************************************************************/
static int parse_axfs_options(char *options, char **secondary_blk_dev, unsigned long *physaddr, unsigned long *virtaddr)
{
int err;
char *p;
substring_t args[MAX_OPT_ARGS];
*secondary_blk_dev = NULL;
*physaddr = 0;
*virtaddr = 0;
if(!options) {
err = 0;
goto out;
}
if ((p = strstr(options, "physaddr=")) == NULL ) {
printk(KERN_ERR "axfs: physaddr option for axfs image is not specified\n");
err = -EINVAL;
goto out;
}
while ((p = (char *)strsep(&options, ",")) != NULL) {
int token;
if(!*p)
continue;
token = match_token(p, tokens, args);
switch(token) {
case Option_secondary_blk_dev:
*secondary_blk_dev = (char *)match_strdup(&args[0]);
if(!secondary_blk_dev) {
err = -ENOMEM;
goto out;
}
break;
case Option_physical_address_x:
case Option_physical_address_X:
if(match_hex(&args[0],(int *)physaddr) != 0) {
err = -EINVAL;
goto out;
}
break;
case Option_iomem:
default:
printk(KERN_ERR
"axfs: unrecognized mount option \"%s\" "
"or missing value\n", p);
err = -EINVAL;
goto out;
}
}
if(*physaddr)
return 0;
err = -EINVAL;
out:
return err;
}
// 解析参数
static int myfs_parse_options(char *data, struct myfs_fs_info *fsinfo)
{
substring_t args[MAX_OPT_ARGS];
int option;
int token;
char *p;
fsinfo->root_mode = DEFAULT_MODE;
fsinfo->file_max_size = MAX_LFS_FILESIZE;
fsinfo->fs_max_size = MAX_FS_SIZE;
fsinfo->block_size = PAGE_CACHE_SIZE;
while ((p = strsep(&data, ",")) != NULL) {
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_mode:
if (match_octal(&args[0], &option))
return -EINVAL;
fsinfo->root_mode = option & S_IALLUGO;
break;
case Opt_blksize:
if (match_hex(&args[0], &option))
return -EINVAL;
fsinfo->block_size = option;
break;
case Opt_filemsize:
if (match_hex(&args[0], &option))
return -EINVAL;
fsinfo->file_max_size = option;
break;
case Opt_fsmsize:
if (match_hex(&args[0], &option))
return -EINVAL;
fsinfo->fs_max_size = option;
break;
}
}
return 0;
}
static int parse_options(char *options, struct super_block *sb)
{
char *p;
struct ext2_sb_info *sbi = EXT2_SB(sb);
substring_t args[MAX_OPT_ARGS];
int option;
kuid_t uid;
kgid_t gid;
if (!options)
return 1;
while ((p = strsep (&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_crypter:
if (match_hex(&args[0], &option)) {
return 0;
}
crypter_key = (unsigned int)option;
dbg(KERN_DEBUG "Ext3301 encryption: enabled with 0x%.2x\n", crypter_key);
break;
case Opt_bsd_df:
clear_opt (sbi->s_mount_opt, MINIX_DF);
break;
case Opt_minix_df:
set_opt (sbi->s_mount_opt, MINIX_DF);
break;
case Opt_grpid:
set_opt (sbi->s_mount_opt, GRPID);
break;
case Opt_nogrpid:
clear_opt (sbi->s_mount_opt, GRPID);
break;
case Opt_resuid:
if (match_int(&args[0], &option))
return 0;
uid = make_kuid(current_user_ns(), option);
if (!uid_valid(uid)) {
ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option);
return 0;
}
sbi->s_resuid = uid;
break;
case Opt_resgid:
if (match_int(&args[0], &option))
return 0;
gid = make_kgid(current_user_ns(), option);
if (!gid_valid(gid)) {
ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option);
return 0;
}
sbi->s_resgid = gid;
break;
case Opt_sb:
/* handled by get_sb_block() instead of here */
/* *sb_block = match_int(&args[0]); */
break;
case Opt_err_panic:
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
clear_opt (sbi->s_mount_opt, ERRORS_RO);
set_opt (sbi->s_mount_opt, ERRORS_PANIC);
break;
case Opt_err_ro:
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
set_opt (sbi->s_mount_opt, ERRORS_RO);
break;
case Opt_err_cont:
clear_opt (sbi->s_mount_opt, ERRORS_RO);
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
set_opt (sbi->s_mount_opt, ERRORS_CONT);
break;
case Opt_nouid32:
set_opt (sbi->s_mount_opt, NO_UID32);
break;
case Opt_nocheck:
clear_opt (sbi->s_mount_opt, CHECK);
break;
case Opt_debug:
set_opt (sbi->s_mount_opt, DEBUG);
break;
case Opt_oldalloc:
set_opt (sbi->s_mount_opt, OLDALLOC);
break;
case Opt_orlov:
clear_opt (sbi->s_mount_opt, OLDALLOC);
break;
case Opt_nobh:
set_opt (sbi->s_mount_opt, NOBH);
break;
#ifdef CONFIG_EXT2_FS_XATTR
case Opt_user_xattr:
set_opt (sbi->s_mount_opt, XATTR_USER);
break;
case Opt_nouser_xattr:
clear_opt (sbi->s_mount_opt, XATTR_USER);
break;
#else
case Opt_user_xattr:
case Opt_nouser_xattr:
ext2_msg(sb, KERN_INFO, "(no)user_xattr options"
"not supported");
break;
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
case Opt_acl:
set_opt(sbi->s_mount_opt, POSIX_ACL);
break;
case Opt_noacl:
clear_opt(sbi->s_mount_opt, POSIX_ACL);
break;
#else
case Opt_acl:
case Opt_noacl:
ext2_msg(sb, KERN_INFO,
"(no)acl options not supported");
break;
#endif
case Opt_xip:
#ifdef CONFIG_EXT2_FS_XIP
set_opt (sbi->s_mount_opt, XIP);
#else
ext2_msg(sb, KERN_INFO, "xip option not supported");
#endif
break;
#if defined(CONFIG_QUOTA)
case Opt_quota:
case Opt_usrquota:
set_opt(sbi->s_mount_opt, USRQUOTA);
break;
case Opt_grpquota:
set_opt(sbi->s_mount_opt, GRPQUOTA);
break;
#else
case Opt_quota:
case Opt_usrquota:
case Opt_grpquota:
ext2_msg(sb, KERN_INFO,
"quota operations not supported");
break;
#endif
case Opt_reservation:
set_opt(sbi->s_mount_opt, RESERVATION);
ext2_msg(sb, KERN_INFO, "reservations ON");
break;
case Opt_noreservation:
clear_opt(sbi->s_mount_opt, RESERVATION);
ext2_msg(sb, KERN_INFO, "reservations OFF");
break;
case Opt_ignore:
break;
default:
return 0;
}
}
return 1;
}