/*

* linux/fs/hfsplus/options.c

*

* Copyright (C) 2001

* Brad Boyer (flar@allandria.com)

* (C) 2003 Ardis Technologies <roman@ardistech.com>

*

* Option parsing

*/

#include <linux/string.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/parser.h>

#include <linux/nls.h>

#include <linux/mount.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

#include "hfsplus_fs.h"

enum {

opt_creator, opt_type,

opt_umask, opt_uid, opt_gid,

opt_part, opt_session, opt_nls,

opt_nodecompose, opt_decompose,

opt_barrier, opt_nobarrier,

opt_force, opt_err

};

static const match_table_t tokens = {

{ opt_creator, "creator=%s" },

{ opt_type, "type=%s" },

{ opt_umask, "umask=%o" },

{ opt_uid, "uid=%u" },

{ opt_gid, "gid=%u" },

{ opt_part, "part=%u" },

{ opt_session, "session=%u" },

{ opt_nls, "nls=%s" },

{ opt_decompose, "decompose" },

{ opt_nodecompose, "nodecompose" },

{ opt_barrier, "barrier" },

{ opt_nobarrier, "nobarrier" },

{ opt_force, "force" },

{ opt_err, NULL }

};

/* Initialize an options object to reasonable defaults */

void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)

{

if (!opts)

return;

opts->creator = HFSPLUS_DEF_CR_TYPE;

opts->type = HFSPLUS_DEF_CR_TYPE;

opts->umask = current_umask();

opts->uid = current_uid();

opts->gid = current_gid();

opts->part = -1;

opts->session = -1;

}

/* convert a "four byte character" to a 32 bit int with error checks */

static inline int match_fourchar(substring_t *arg, u32 *result)

{

if (arg->to - arg->from != 4)

return -EINVAL;

memcpy(result, arg->from, 4);

return 0;

}

int hfsplus_parse_options_remount(char *input, int *force)

{

char *p;

substring_t args[MAX_OPT_ARGS];

int token;

if (!input)

return 0;

while ((p = strsep(&input, ",")) != NULL) {

if (!*p)

continue;

token = match_token(p, tokens, args);

switch (token) {

case opt_force:

*force = 1;

break;

default:

break;

}

}

return 1;

}

/* Parse options from mount. Returns 0 on failure */

/* input is the options passed to mount() as a string */

int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)

{

char *p;

substring_t args[MAX_OPT_ARGS];

int tmp, token;

if (!input)

goto done;

while ((p = strsep(&input, ",")) != NULL) {

if (!*p)

continue;

token = match_token(p, tokens, args);

switch (token) {

case opt_creator:

if (match_fourchar(&args[0], &sbi->creator)) {

pr_err("creator requires a 4 character value\n");

return 0;

}

break;

case opt_type:

if (match_fourchar(&args[0], &sbi->type)) {

pr_err("type requires a 4 character value\n");

return 0;

}

break;

case opt_umask:

if (match_octal(&args[0], &tmp)) {

pr_err("umask requires a value\n");

return 0;

}

sbi->umask = (umode_t)tmp;

break;

case opt_uid:

if (match_int(&args[0], &tmp)) {

pr_err("uid requires an argument\n");

return 0;

}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)

sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);

if (!uid_valid(sbi->uid)) {

pr_err("invalid uid specified\n");

return 0;

}

#else

sbi->uid = (uid_t)tmp;

#endif

break;

case opt_gid:

if (match_int(&args[0], &tmp)) {

pr_err("gid requires an argument\n");

return 0;

}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)

sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);

if (!gid_valid(sbi->gid)) {

pr_err("invalid gid specified\n");

return 0;

}

#else

sbi->gid = (gid_t)tmp;

#endif

break;

case opt_part:

if (match_int(&args[0], &sbi->part)) {

pr_err("part requires an argument\n");

return 0;

}

break;

case opt_session:

if (match_int(&args[0], &sbi->session)) {

pr_err("session requires an argument\n");

return 0;

}

break;

case opt_nls:

if (sbi->nls) {

pr_err("unable to change nls mapping\n");

return 0;

}

p = match_strdup(&args[0]);

if (p)

sbi->nls = load_nls(p);

if (!sbi->nls) {

pr_err("unable to load "

"nls mapping \"%s\"\n",

p);

kfree(p);

return 0;

}

kfree(p);

break;

case opt_decompose:

clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);

break;

case opt_nodecompose:

set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);

break;

case opt_barrier:

clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);

break;

case opt_nobarrier:

set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);

break;

case opt_force:

set_bit(HFSPLUS_SB_FORCE, &sbi->flags);

break;

default:

return 0;

}

}

done:

if (!sbi->nls) {

/* try utf8 first, as this is the old default behaviour */

sbi->nls = load_nls("utf8");

if (!sbi->nls)

sbi->nls = load_nls_default();

if (!sbi->nls)

return 0;

}

return 1;

}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)

int hfsplus_show_options(struct seq_file *seq, struct dentry *root)

#else

int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)

#endif

{

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)

struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);

#else

struct hfsplus_sb_info *sbi = HFSPLUS_SB(mnt->mnt_sb);

#endif

if (sbi->creator != HFSPLUS_DEF_CR_TYPE)

seq_printf(seq, ",creator=%.4s", (char *)&sbi->creator);

if (sbi->type != HFSPLUS_DEF_CR_TYPE)

seq_printf(seq, ",type=%.4s", (char *)&sbi->type);

seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,

#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)

from_kuid_munged(&init_user_ns, sbi->uid),

from_kgid_munged(&init_user_ns, sbi->gid));

#else

sbi->uid, sbi->gid);

#endif

if (sbi->part >= 0)

seq_printf(seq, ",part=%u", sbi->part);

if (sbi->session >= 0)

seq_printf(seq, ",session=%u", sbi->session);

if (sbi->nls)

seq_printf(seq, ",nls=%s", sbi->nls->charset);

if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))

seq_printf(seq, ",nodecompose");

if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))

seq_printf(seq, ",nobarrier");

return 0;

}