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-rw-r--r--fs/bcachefs/opts.c381
1 files changed, 381 insertions, 0 deletions
diff --git a/fs/bcachefs/opts.c b/fs/bcachefs/opts.c
new file mode 100644
index 000000000000..9351caeb6630
--- /dev/null
+++ b/fs/bcachefs/opts.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+
+#include "bcachefs.h"
+#include "disk_groups.h"
+#include "opts.h"
+#include "super-io.h"
+#include "util.h"
+
+const char * const bch2_error_actions[] = {
+ "continue",
+ "remount-ro",
+ "panic",
+ NULL
+};
+
+const char * const bch2_csum_types[] = {
+ "none",
+ "crc32c",
+ "crc64",
+ NULL
+};
+
+const char * const bch2_compression_types[] = {
+ "none",
+ "lz4",
+ "gzip",
+ "zstd",
+ NULL
+};
+
+const char * const bch2_str_hash_types[] = {
+ "crc32c",
+ "crc64",
+ "siphash",
+ NULL
+};
+
+const char * const bch2_data_types[] = {
+ "none",
+ "sb",
+ "journal",
+ "btree",
+ "data",
+ "cached",
+ NULL
+};
+
+const char * const bch2_cache_replacement_policies[] = {
+ "lru",
+ "fifo",
+ "random",
+ NULL
+};
+
+/* Default is -1; we skip past it for struct cached_dev's cache mode */
+const char * const bch2_cache_modes[] = {
+ "default",
+ "writethrough",
+ "writeback",
+ "writearound",
+ "none",
+ NULL
+};
+
+const char * const bch2_dev_state[] = {
+ "readwrite",
+ "readonly",
+ "failed",
+ "spare",
+ NULL
+};
+
+void bch2_opts_apply(struct bch_opts *dst, struct bch_opts src)
+{
+#define BCH_OPT(_name, ...) \
+ if (opt_defined(src, _name)) \
+ opt_set(*dst, _name, src._name);
+
+ BCH_OPTS()
+#undef BCH_OPT
+}
+
+bool bch2_opt_defined_by_id(const struct bch_opts *opts, enum bch_opt_id id)
+{
+ switch (id) {
+#define BCH_OPT(_name, ...) \
+ case Opt_##_name: \
+ return opt_defined(*opts, _name);
+ BCH_OPTS()
+#undef BCH_OPT
+ default:
+ BUG();
+ }
+}
+
+u64 bch2_opt_get_by_id(const struct bch_opts *opts, enum bch_opt_id id)
+{
+ switch (id) {
+#define BCH_OPT(_name, ...) \
+ case Opt_##_name: \
+ return opts->_name;
+ BCH_OPTS()
+#undef BCH_OPT
+ default:
+ BUG();
+ }
+}
+
+void bch2_opt_set_by_id(struct bch_opts *opts, enum bch_opt_id id, u64 v)
+{
+ switch (id) {
+#define BCH_OPT(_name, ...) \
+ case Opt_##_name: \
+ opt_set(*opts, _name, v); \
+ break;
+ BCH_OPTS()
+#undef BCH_OPT
+ default:
+ BUG();
+ }
+}
+
+/*
+ * Initial options from superblock - here we don't want any options undefined,
+ * any options the superblock doesn't specify are set to 0:
+ */
+struct bch_opts bch2_opts_from_sb(struct bch_sb *sb)
+{
+ struct bch_opts opts = bch2_opts_empty();
+
+#define BCH_OPT(_name, _bits, _mode, _type, _sb_opt, _default) \
+ if (_sb_opt != NO_SB_OPT) \
+ opt_set(opts, _name, _sb_opt(sb));
+ BCH_OPTS()
+#undef BCH_OPT
+
+ return opts;
+}
+
+const struct bch_option bch2_opt_table[] = {
+#define OPT_BOOL() .type = BCH_OPT_BOOL
+#define OPT_UINT(_min, _max) .type = BCH_OPT_UINT, .min = _min, .max = _max
+#define OPT_STR(_choices) .type = BCH_OPT_STR, .choices = _choices
+#define OPT_FN(_fn) .type = BCH_OPT_FN, \
+ .parse = _fn##_parse, \
+ .print = _fn##_print
+
+#define BCH_OPT(_name, _bits, _mode, _type, _sb_opt, _default) \
+ [Opt_##_name] = { \
+ .attr = { \
+ .name = #_name, \
+ .mode = _mode == OPT_RUNTIME ? 0644 : 0444, \
+ }, \
+ .mode = _mode, \
+ .set_sb = SET_##_sb_opt, \
+ _type \
+ },
+
+ BCH_OPTS()
+#undef BCH_OPT
+};
+
+int bch2_opt_lookup(const char *name)
+{
+ const struct bch_option *i;
+
+ for (i = bch2_opt_table;
+ i < bch2_opt_table + ARRAY_SIZE(bch2_opt_table);
+ i++)
+ if (!strcmp(name, i->attr.name))
+ return i - bch2_opt_table;
+
+ return -1;
+}
+
+struct synonym {
+ const char *s1, *s2;
+};
+
+static const struct synonym bch_opt_synonyms[] = {
+ { "quota", "usrquota" },
+};
+
+static int bch2_mount_opt_lookup(const char *name)
+{
+ const struct synonym *i;
+
+ for (i = bch_opt_synonyms;
+ i < bch_opt_synonyms + ARRAY_SIZE(bch_opt_synonyms);
+ i++)
+ if (!strcmp(name, i->s1))
+ name = i->s2;
+
+ return bch2_opt_lookup(name);
+}
+
+int bch2_opt_parse(struct bch_fs *c, const struct bch_option *opt,
+ const char *val, u64 *res)
+{
+ ssize_t ret;
+
+ switch (opt->type) {
+ case BCH_OPT_BOOL:
+ ret = kstrtou64(val, 10, res);
+ if (ret < 0)
+ return ret;
+
+ if (*res > 1)
+ return -ERANGE;
+ break;
+ case BCH_OPT_UINT:
+ ret = kstrtou64(val, 10, res);
+ if (ret < 0)
+ return ret;
+
+ if (*res < opt->min || *res >= opt->max)
+ return -ERANGE;
+ break;
+ case BCH_OPT_STR:
+ ret = match_string(opt->choices, -1, val);
+ if (ret < 0)
+ return ret;
+
+ *res = ret;
+ break;
+ case BCH_OPT_FN:
+ if (!c)
+ return -EINVAL;
+
+ return opt->parse(c, val, res);
+ }
+
+ return 0;
+}
+
+int bch2_opt_to_text(struct bch_fs *c, char *buf, size_t len,
+ const struct bch_option *opt, u64 v,
+ unsigned flags)
+{
+ char *out = buf, *end = buf + len;
+
+ if (flags & OPT_SHOW_MOUNT_STYLE) {
+ if (opt->type == BCH_OPT_BOOL)
+ return scnprintf(out, end - out, "%s%s",
+ v ? "" : "no",
+ opt->attr.name);
+
+ out += scnprintf(out, end - out, "%s=", opt->attr.name);
+ }
+
+ switch (opt->type) {
+ case BCH_OPT_BOOL:
+ case BCH_OPT_UINT:
+ out += scnprintf(out, end - out, "%lli", v);
+ break;
+ case BCH_OPT_STR:
+ out += (flags & OPT_SHOW_FULL_LIST)
+ ? bch2_scnprint_string_list(out, end - out, opt->choices, v)
+ : scnprintf(out, end - out, opt->choices[v]);
+ break;
+ case BCH_OPT_FN:
+ return opt->print(c, out, end - out, v);
+ default:
+ BUG();
+ }
+
+ return out - buf;
+}
+
+int bch2_parse_mount_opts(struct bch_opts *opts, char *options)
+{
+ char *opt, *name, *val;
+ int ret, id;
+ u64 v;
+
+ while ((opt = strsep(&options, ",")) != NULL) {
+ name = strsep(&opt, "=");
+ val = opt;
+
+ if (val) {
+ id = bch2_mount_opt_lookup(name);
+ if (id < 0)
+ goto bad_opt;
+
+ ret = bch2_opt_parse(NULL, &bch2_opt_table[id], val, &v);
+ if (ret < 0)
+ goto bad_val;
+ } else {
+ id = bch2_mount_opt_lookup(name);
+ v = 1;
+
+ if (id < 0 &&
+ !strncmp("no", name, 2)) {
+ id = bch2_mount_opt_lookup(name + 2);
+ v = 0;
+ }
+
+ if (id < 0)
+ goto bad_opt;
+
+ if (bch2_opt_table[id].type != BCH_OPT_BOOL)
+ goto no_val;
+ }
+
+ if (bch2_opt_table[id].mode < OPT_MOUNT)
+ goto bad_opt;
+
+ if (id == Opt_acl &&
+ !IS_ENABLED(CONFIG_BCACHEFS_POSIX_ACL))
+ goto bad_opt;
+
+ if ((id == Opt_usrquota ||
+ id == Opt_grpquota) &&
+ !IS_ENABLED(CONFIG_BCACHEFS_QUOTA))
+ goto bad_opt;
+
+ bch2_opt_set_by_id(opts, id, v);
+ }
+
+ return 0;
+bad_opt:
+ pr_err("Bad mount option %s", name);
+ return -1;
+bad_val:
+ pr_err("Invalid value %s for mount option %s", val, name);
+ return -1;
+no_val:
+ pr_err("Mount option %s requires a value", name);
+ return -1;
+}
+
+/* io opts: */
+
+struct bch_io_opts bch2_opts_to_inode_opts(struct bch_opts src)
+{
+ struct bch_io_opts ret = { 0 };
+#define BCH_INODE_OPT(_name, _bits) \
+ if (opt_defined(src, _name)) \
+ opt_set(ret, _name, src._name);
+ BCH_INODE_OPTS()
+#undef BCH_INODE_OPT
+ return ret;
+}
+
+struct bch_opts bch2_inode_opts_to_opts(struct bch_io_opts src)
+{
+ struct bch_opts ret = { 0 };
+#define BCH_INODE_OPT(_name, _bits) \
+ if (opt_defined(src, _name)) \
+ opt_set(ret, _name, src._name);
+ BCH_INODE_OPTS()
+#undef BCH_INODE_OPT
+ return ret;
+}
+
+void bch2_io_opts_apply(struct bch_io_opts *dst, struct bch_io_opts src)
+{
+#define BCH_INODE_OPT(_name, _bits) \
+ if (opt_defined(src, _name)) \
+ opt_set(*dst, _name, src._name);
+ BCH_INODE_OPTS()
+#undef BCH_INODE_OPT
+}
+
+bool bch2_opt_is_inode_opt(enum bch_opt_id id)
+{
+ static const enum bch_opt_id inode_opt_list[] = {
+#define BCH_INODE_OPT(_name, _bits) Opt_##_name,
+ BCH_INODE_OPTS()
+#undef BCH_INODE_OPT
+ };
+ unsigned i;
+
+ for (i = 0; i < ARRAY_SIZE(inode_opt_list); i++)
+ if (inode_opt_list[i] == id)
+ return true;
+
+ return false;
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-26 08:03:29 +0300