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bcachefs: Better superblock opt validation

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This moves validation of superblock options to bch2_sb_validate(), so
they'll be checked in the write path as well.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-03-21 00:15:38 -04:00 committed by Kent Overstreet
parent 74b33393db
commit 63c4b25453
5 changed files with 43 additions and 32 deletions
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50
fs/bcachefs/opts.c
View File

@ -224,42 +224,43 @@ static int bch2_mount_opt_lookup(const char *name)
return bch2_opt_lookup(name);
}
static int bch2_opt_validate(const struct bch_option *opt, const char *msg, u64 v)
int bch2_opt_validate(const struct bch_option *opt, u64 v, struct printbuf *err)
{
if (v < opt->min) {
if (msg)
pr_err("invalid %s%s: too small (min %llu)",
msg, opt->attr.name, opt->min);
if (err)
pr_buf(err, "%s: too small (min %llu)",
opt->attr.name, opt->min);
return -ERANGE;
}
if (opt->max && v >= opt->max) {
if (msg)
pr_err("invalid %s%s: too big (max %llu)",
msg, opt->attr.name, opt->max);
if (err)
pr_buf(err, "%s: too big (max %llu)",
opt->attr.name, opt->max);
return -ERANGE;
}
if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {
if (msg)
pr_err("invalid %s %s: not a multiple of 512",
msg, opt->attr.name);
if (err)
pr_buf(err, "%s: not a multiple of 512",
opt->attr.name);
return -EINVAL;
}
if ((opt->flags & OPT_MUST_BE_POW_2) && !is_power_of_2(v)) {
if (msg)
pr_err("invalid %s%s: must be a power of two",
msg, opt->attr.name);
if (err)
pr_buf(err, "%s: must be a power of two",
opt->attr.name);
return -EINVAL;
}
return 0;
}
int bch2_opt_parse(struct bch_fs *c, const char *msg,
int bch2_opt_parse(struct bch_fs *c,
const struct bch_option *opt,
const char *val, u64 *res)
const char *val, u64 *res,
struct printbuf *err)
{
ssize_t ret;
@ -292,7 +293,7 @@ int bch2_opt_parse(struct bch_fs *c, const char *msg,
return ret;
}
return bch2_opt_validate(opt, msg, *res);
return bch2_opt_validate(opt, *res, err);
}
void bch2_opt_to_text(struct printbuf *out,
@ -372,6 +373,7 @@ int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
char *copied_opts, *copied_opts_start;
char *opt, *name, *val;
int ret, id;
struct printbuf err = PRINTBUF;
u64 v;
if (!options)
@ -391,8 +393,7 @@ int bch2_parse_mount_opts(struct bch_fs *c, struct bch_opts *opts,
if (id < 0)
goto bad_opt;
ret = bch2_opt_parse(c, "mount option ",
&bch2_opt_table[id], val, &v);
ret = bch2_opt_parse(c, &bch2_opt_table[id], val, &v, &err);
if (ret < 0)
goto bad_val;
} else {
@ -435,7 +436,7 @@ bad_opt:
ret = -1;
goto out;
bad_val:
pr_err("Invalid value %s for mount option %s", val, name);
pr_err("Invalid mount option %s", err.buf);
ret = -1;
goto out;
no_val:
@ -444,6 +445,7 @@ no_val:
goto out;
out:
kfree(copied_opts_start);
printbuf_exit(&err);
return ret;
}
@ -470,22 +472,14 @@ u64 bch2_opt_from_sb(struct bch_sb *sb, enum bch_opt_id id)
int bch2_opts_from_sb(struct bch_opts *opts, struct bch_sb *sb)
{
unsigned id;
int ret;
for (id = 0; id < bch2_opts_nr; id++) {
const struct bch_option *opt = bch2_opt_table + id;
u64 v;
if (opt->get_sb == BCH2_NO_SB_OPT)
continue;
v = bch2_opt_from_sb(sb, id);
ret = bch2_opt_validate(opt, "superblock option ", v);
if (ret)
return ret;
bch2_opt_set_by_id(opts, id, v);
bch2_opt_set_by_id(opts, id, bch2_opt_from_sb(sb, id));
}
return 0;

5
fs/bcachefs/opts.h
View File

@ -489,8 +489,9 @@ void __bch2_opt_set_sb(struct bch_sb *, const struct bch_option *, u64);
void bch2_opt_set_sb(struct bch_fs *, const struct bch_option *, u64);
int bch2_opt_lookup(const char *);
int bch2_opt_parse(struct bch_fs *, const char *, const struct bch_option *,
const char *, u64 *);
int bch2_opt_validate(const struct bch_option *, u64, struct printbuf *);
int bch2_opt_parse(struct bch_fs *, const struct bch_option *,
const char *, u64 *, struct printbuf *);
#define OPT_SHOW_FULL_LIST (1 << 0)
#define OPT_SHOW_MOUNT_STYLE (1 << 1)

16
fs/bcachefs/super-io.c
View File

@ -258,6 +258,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out)
struct bch_sb *sb = disk_sb->sb;
struct bch_sb_field *f;
struct bch_sb_field_members *mi;
enum bch_opt_id opt_id;
u32 version, version_min;
u16 block_size;
int ret;
@ -329,6 +330,21 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out)
return -EINVAL;
}
for (opt_id = 0; opt_id < bch2_opts_nr; opt_id++) {
const struct bch_option *opt = bch2_opt_table + opt_id;
if (opt->get_sb != BCH2_NO_SB_OPT) {
u64 v = bch2_opt_from_sb(sb, opt_id);
pr_buf(out, "Invalid option ");
ret = bch2_opt_validate(opt, v, out);
if (ret)
return ret;
printbuf_reset(out);
}
}
/* validate layout */
ret = validate_sb_layout(&sb->layout, out);
if (ret)

2
fs/bcachefs/sysfs.c
View File

@ -624,7 +624,7 @@ STORE(bch2_fs_opts_dir)
goto err;
}
ret = bch2_opt_parse(c, NULL, opt, strim(tmp), &v);
ret = bch2_opt_parse(c, opt, strim(tmp), &v, NULL);
kfree(tmp);
if (ret < 0)

2
fs/bcachefs/xattr.c
View File

@ -525,7 +525,7 @@ static int bch2_xattr_bcachefs_set(const struct xattr_handler *handler,
memcpy(buf, value, size);
buf[size] = '\0';
ret = bch2_opt_parse(c, NULL, opt, buf, &v);
ret = bch2_opt_parse(c, opt, buf, &v, NULL);
kfree(buf);
if (ret < 0)