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shmem_parse_options(): take handling a single option into a helper 

mechanical move.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-09-08 19:20:12 -04:00
parent f6490b7fbb
commit e04dc423ae
1 changed files with 79 additions and 69 deletions
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148
mm/shmem.c
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@ -3363,12 +3363,88 @@ static const struct export_operations shmem_export_ops = {
.fh_to_dentry = shmem_fh_to_dentry,
};
static int shmem_parse_options(char *options, struct shmem_options *ctx)
static int shmem_parse_one(struct shmem_options *ctx, char *opt, char *value)
{
char *this_char, *value, *rest;
char *rest;
uid_t uid;
gid_t gid;
if (!strcmp(opt, "size")) {
unsigned long long size;
size = memparse(value,&rest);
if (*rest == '%') {
size <<= PAGE_SHIFT;
size *= totalram_pages();
do_div(size, 100);
rest++;
}
if (*rest)
goto bad_val;
ctx->blocks = DIV_ROUND_UP(size, PAGE_SIZE);
ctx->seen |= SHMEM_SEEN_BLOCKS;
} else if (!strcmp(opt, "nr_blocks")) {
ctx->blocks = memparse(value, &rest);
if (*rest)
goto bad_val;
ctx->seen |= SHMEM_SEEN_BLOCKS;
} else if (!strcmp(opt, "nr_inodes")) {
ctx->inodes = memparse(value, &rest);
if (*rest)
goto bad_val;
ctx->seen |= SHMEM_SEEN_INODES;
} else if (!strcmp(opt, "mode")) {
ctx->mode = simple_strtoul(value, &rest, 8) & 07777;
if (*rest)
goto bad_val;
} else if (!strcmp(opt, "uid")) {
uid = simple_strtoul(value, &rest, 0);
if (*rest)
goto bad_val;
ctx->uid = make_kuid(current_user_ns(), uid);
if (!uid_valid(ctx->uid))
goto bad_val;
} else if (!strcmp(opt, "gid")) {
gid = simple_strtoul(value, &rest, 0);
if (*rest)
goto bad_val;
ctx->gid = make_kgid(current_user_ns(), gid);
if (!gid_valid(ctx->gid))
goto bad_val;
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
} else if (!strcmp(opt, "huge")) {
int huge;
huge = shmem_parse_huge(value);
if (huge < 0)
goto bad_val;
if (!has_transparent_hugepage() &&
huge != SHMEM_HUGE_NEVER)
goto bad_val;
ctx->huge = huge;
ctx->seen |= SHMEM_SEEN_HUGE;
#endif
#ifdef CONFIG_NUMA
} else if (!strcmp(opt, "mpol")) {
mpol_put(ctx->mpol);
ctx->mpol = NULL;
if (mpol_parse_str(value, &ctx->mpol))
goto bad_val;
#endif
} else {
pr_err("tmpfs: Bad mount option %s\n", opt);
return -EINVAL;
}
return 0;
bad_val:
pr_err("tmpfs: Bad value '%s' for mount option '%s'\n",
value, opt);
return -EINVAL;
}
static int shmem_parse_options(char *options, struct shmem_options *ctx)
{
char *this_char, *value;
while (options != NULL) {
this_char = options;
for (;;) {
@ -3395,77 +3471,11 @@ static int shmem_parse_options(char *options, struct shmem_options *ctx)
this_char);
goto error;
}
if (!strcmp(this_char,"size")) {
unsigned long long size;
size = memparse(value,&rest);
if (*rest == '%') {
size <<= PAGE_SHIFT;
size *= totalram_pages();
do_div(size, 100);
rest++;
}
if (*rest)
goto bad_val;
ctx->blocks = DIV_ROUND_UP(size, PAGE_SIZE);
ctx->seen |= SHMEM_SEEN_BLOCKS;
} else if (!strcmp(this_char,"nr_blocks")) {
ctx->blocks = memparse(value, &rest);
if (*rest)
goto bad_val;
ctx->seen |= SHMEM_SEEN_BLOCKS;
} else if (!strcmp(this_char,"nr_inodes")) {
ctx->inodes = memparse(value, &rest);
if (*rest)
goto bad_val;
ctx->seen |= SHMEM_SEEN_INODES;
} else if (!strcmp(this_char,"mode")) {
ctx->mode = simple_strtoul(value, &rest, 8) & 07777;
if (*rest)
goto bad_val;
} else if (!strcmp(this_char,"uid")) {
uid = simple_strtoul(value, &rest, 0);
if (*rest)
goto bad_val;
ctx->uid = make_kuid(current_user_ns(), uid);
if (!uid_valid(ctx->uid))
goto bad_val;
} else if (!strcmp(this_char,"gid")) {
gid = simple_strtoul(value, &rest, 0);
if (*rest)
goto bad_val;
ctx->gid = make_kgid(current_user_ns(), gid);
if (!gid_valid(ctx->gid))
goto bad_val;
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE
} else if (!strcmp(this_char, "huge")) {
int huge;
huge = shmem_parse_huge(value);
if (huge < 0)
goto bad_val;
if (!has_transparent_hugepage() &&
huge != SHMEM_HUGE_NEVER)
goto bad_val;
ctx->huge = huge;
ctx->seen |= SHMEM_SEEN_HUGE;
#endif
#ifdef CONFIG_NUMA
} else if (!strcmp(this_char,"mpol")) {
mpol_put(ctx->mpol);
ctx->mpol = NULL;
if (mpol_parse_str(value, &ctx->mpol))
goto bad_val;
#endif
} else {
pr_err("tmpfs: Bad mount option %s\n", this_char);
if (shmem_parse_one(ctx, this_char, value) < 0)
goto error;
}
}
return 0;
bad_val:
pr_err("tmpfs: Bad value '%s' for mount option '%s'\n",
value, this_char);
error:
mpol_put(ctx->mpol);
ctx->mpol = NULL;