#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/crc32c.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
#include "xattr.h"
#define CREATE_TRACE_POINTS
return ret;
}
-#ifdef CONFIG_EROFS_FS_ZIP
-static int erofs_build_cache_strategy(struct super_block *sb,
- substring_t *args)
-{
- struct erofs_sb_info *sbi = EROFS_SB(sb);
- const char *cs = match_strdup(args);
- int err = 0;
-
- if (!cs) {
- erofs_err(sb, "Not enough memory to store cache strategy");
- return -ENOMEM;
- }
-
- if (!strcmp(cs, "disabled")) {
- sbi->cache_strategy = EROFS_ZIP_CACHE_DISABLED;
- } else if (!strcmp(cs, "readahead")) {
- sbi->cache_strategy = EROFS_ZIP_CACHE_READAHEAD;
- } else if (!strcmp(cs, "readaround")) {
- sbi->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
- } else {
- erofs_err(sb, "Unrecognized cache strategy \"%s\"", cs);
- err = -EINVAL;
- }
- kfree(cs);
- return err;
-}
-#else
-static int erofs_build_cache_strategy(struct super_block *sb,
- substring_t *args)
-{
- erofs_info(sb, "EROFS compression is disabled, so cache strategy is ignored");
- return 0;
-}
-#endif
-
/* set up default EROFS parameters */
-static void erofs_default_options(struct erofs_sb_info *sbi)
+static void erofs_default_options(struct erofs_fs_context *ctx)
{
#ifdef CONFIG_EROFS_FS_ZIP
- sbi->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
- sbi->max_sync_decompress_pages = 3;
+ ctx->cache_strategy = EROFS_ZIP_CACHE_READAROUND;
+ ctx->max_sync_decompress_pages = 3;
#endif
#ifdef CONFIG_EROFS_FS_XATTR
- set_opt(sbi, XATTR_USER);
+ set_opt(ctx, XATTR_USER);
#endif
#ifdef CONFIG_EROFS_FS_POSIX_ACL
- set_opt(sbi, POSIX_ACL);
+ set_opt(ctx, POSIX_ACL);
#endif
}
Opt_err
};
-static match_table_t erofs_tokens = {
- {Opt_user_xattr, "user_xattr"},
- {Opt_nouser_xattr, "nouser_xattr"},
- {Opt_acl, "acl"},
- {Opt_noacl, "noacl"},
- {Opt_cache_strategy, "cache_strategy=%s"},
- {Opt_err, NULL}
+static const struct constant_table erofs_param_cache_strategy[] = {
+ {"disabled", EROFS_ZIP_CACHE_DISABLED},
+ {"readahead", EROFS_ZIP_CACHE_READAHEAD},
+ {"readaround", EROFS_ZIP_CACHE_READAROUND},
+ {}
};
-static int erofs_parse_options(struct super_block *sb, char *options)
-{
- substring_t args[MAX_OPT_ARGS];
- char *p;
- int err;
-
- if (!options)
- return 0;
-
- while ((p = strsep(&options, ","))) {
- int token;
+static const struct fs_parameter_spec erofs_fs_parameters[] = {
+ fsparam_flag_no("user_xattr", Opt_user_xattr),
+ fsparam_flag_no("acl", Opt_acl),
+ fsparam_enum("cache_strategy", Opt_cache_strategy,
+ erofs_param_cache_strategy),
+ {}
+};
- if (!*p)
- continue;
+static int erofs_fc_parse_param(struct fs_context *fc,
+ struct fs_parameter *param)
+{
+ struct erofs_fs_context *ctx __maybe_unused = fc->fs_private;
+ struct fs_parse_result result;
+ int opt;
- args[0].to = args[0].from = NULL;
- token = match_token(p, erofs_tokens, args);
+ opt = fs_parse(fc, erofs_fs_parameters, param, &result);
+ if (opt < 0)
+ return opt;
- switch (token) {
+ switch (opt) {
+ case Opt_user_xattr:
#ifdef CONFIG_EROFS_FS_XATTR
- case Opt_user_xattr:
- set_opt(EROFS_SB(sb), XATTR_USER);
- break;
- case Opt_nouser_xattr:
- clear_opt(EROFS_SB(sb), XATTR_USER);
- break;
+ if (result.boolean)
+ set_opt(ctx, XATTR_USER);
+ else
+ clear_opt(ctx, XATTR_USER);
#else
- case Opt_user_xattr:
- erofs_info(sb, "user_xattr options not supported");
- break;
- case Opt_nouser_xattr:
- erofs_info(sb, "nouser_xattr options not supported");
- break;
+ errorfc(fc, "{,no}user_xattr options not supported");
#endif
+ break;
+ case Opt_acl:
#ifdef CONFIG_EROFS_FS_POSIX_ACL
- case Opt_acl:
- set_opt(EROFS_SB(sb), POSIX_ACL);
- break;
- case Opt_noacl:
- clear_opt(EROFS_SB(sb), POSIX_ACL);
- break;
+ if (result.boolean)
+ set_opt(ctx, POSIX_ACL);
+ else
+ clear_opt(ctx, POSIX_ACL);
#else
- case Opt_acl:
- erofs_info(sb, "acl options not supported");
- break;
- case Opt_noacl:
- erofs_info(sb, "noacl options not supported");
- break;
+ errorfc(fc, "{,no}acl options not supported");
#endif
- case Opt_cache_strategy:
- err = erofs_build_cache_strategy(sb, args);
- if (err)
- return err;
- break;
- default:
- erofs_err(sb, "Unrecognized mount option \"%s\" or missing value", p);
- return -EINVAL;
- }
+ break;
+ case Opt_cache_strategy:
+#ifdef CONFIG_EROFS_FS_ZIP
+ ctx->cache_strategy = result.uint_32;
+#else
+ errorfc(fc, "compression not supported, cache_strategy ignored");
+#endif
+ break;
+ default:
+ return -ENOPARAM;
}
return 0;
}
static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
#endif
-static int erofs_fill_super(struct super_block *sb, void *data, int silent)
+static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
struct erofs_sb_info *sbi;
+ struct erofs_fs_context *ctx = fc->fs_private;
int err;
sb->s_magic = EROFS_SUPER_MAGIC;
sb->s_time_gran = 1;
sb->s_op = &erofs_sops;
-
-#ifdef CONFIG_EROFS_FS_XATTR
sb->s_xattr = erofs_xattr_handlers;
-#endif
- /* set erofs default mount options */
- erofs_default_options(sbi);
- err = erofs_parse_options(sb, data);
- if (err)
- return err;
-
- if (test_opt(sbi, POSIX_ACL))
+ if (test_opt(ctx, POSIX_ACL))
sb->s_flags |= SB_POSIXACL;
else
sb->s_flags &= ~SB_POSIXACL;
+ sbi->ctx = *ctx;
+
#ifdef CONFIG_EROFS_FS_ZIP
xa_init(&sbi->managed_pslots);
#endif
if (err)
return err;
- erofs_info(sb, "mounted with opts: %s, root inode @ nid %llu.",
- (char *)data, ROOT_NID(sbi));
+ erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
+ return 0;
+}
+
+static int erofs_fc_get_tree(struct fs_context *fc)
+{
+ return get_tree_bdev(fc, erofs_fc_fill_super);
+}
+
+static int erofs_fc_reconfigure(struct fs_context *fc)
+{
+ struct super_block *sb = fc->root->d_sb;
+ struct erofs_sb_info *sbi = EROFS_SB(sb);
+ struct erofs_fs_context *ctx = fc->fs_private;
+
+ DBG_BUGON(!sb_rdonly(sb));
+
+ if (test_opt(ctx, POSIX_ACL))
+ fc->sb_flags |= SB_POSIXACL;
+ else
+ fc->sb_flags &= ~SB_POSIXACL;
+
+ sbi->ctx = *ctx;
+
+ fc->sb_flags |= SB_RDONLY;
return 0;
}
-static struct dentry *erofs_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
+static void erofs_fc_free(struct fs_context *fc)
{
- return mount_bdev(fs_type, flags, dev_name, data, erofs_fill_super);
+ kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations erofs_context_ops = {
+ .parse_param = erofs_fc_parse_param,
+ .get_tree = erofs_fc_get_tree,
+ .reconfigure = erofs_fc_reconfigure,
+ .free = erofs_fc_free,
+};
+
+static int erofs_init_fs_context(struct fs_context *fc)
+{
+ fc->fs_private = kzalloc(sizeof(struct erofs_fs_context), GFP_KERNEL);
+ if (!fc->fs_private)
+ return -ENOMEM;
+
+ /* set default mount options */
+ erofs_default_options(fc->fs_private);
+
+ fc->ops = &erofs_context_ops;
+
+ return 0;
}
/*
static struct file_system_type erofs_fs_type = {
.owner = THIS_MODULE,
.name = "erofs",
- .mount = erofs_mount,
+ .init_fs_context = erofs_init_fs_context,
.kill_sb = erofs_kill_sb,
.fs_flags = FS_REQUIRES_DEV,
};
static int erofs_show_options(struct seq_file *seq, struct dentry *root)
{
struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
+ struct erofs_fs_context *ctx __maybe_unused = &sbi->ctx;
#ifdef CONFIG_EROFS_FS_XATTR
- if (test_opt(sbi, XATTR_USER))
+ if (test_opt(ctx, XATTR_USER))
seq_puts(seq, ",user_xattr");
else
seq_puts(seq, ",nouser_xattr");
#endif
#ifdef CONFIG_EROFS_FS_POSIX_ACL
- if (test_opt(sbi, POSIX_ACL))
+ if (test_opt(ctx, POSIX_ACL))
seq_puts(seq, ",acl");
else
seq_puts(seq, ",noacl");
#endif
#ifdef CONFIG_EROFS_FS_ZIP
- if (sbi->cache_strategy == EROFS_ZIP_CACHE_DISABLED) {
+ if (ctx->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
seq_puts(seq, ",cache_strategy=disabled");
- } else if (sbi->cache_strategy == EROFS_ZIP_CACHE_READAHEAD) {
+ else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
seq_puts(seq, ",cache_strategy=readahead");
- } else if (sbi->cache_strategy == EROFS_ZIP_CACHE_READAROUND) {
+ else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
seq_puts(seq, ",cache_strategy=readaround");
- }
#endif
return 0;
}
-static int erofs_remount(struct super_block *sb, int *flags, char *data)
-{
- struct erofs_sb_info *sbi = EROFS_SB(sb);
- unsigned int org_mnt_opt = sbi->mount_opt;
- int err;
-
- DBG_BUGON(!sb_rdonly(sb));
- err = erofs_parse_options(sb, data);
- if (err)
- goto out;
-
- if (test_opt(sbi, POSIX_ACL))
- sb->s_flags |= SB_POSIXACL;
- else
- sb->s_flags &= ~SB_POSIXACL;
-
- *flags |= SB_RDONLY;
- return 0;
-out:
- sbi->mount_opt = org_mnt_opt;
- return err;
-}
-
const struct super_operations erofs_sops = {
.put_super = erofs_put_super,
.alloc_inode = erofs_alloc_inode,
.free_inode = erofs_free_inode,
.statfs = erofs_statfs,
.show_options = erofs_show_options,
- .remount_fs = erofs_remount,
};
module_init(erofs_module_init);
projects / linux-2.6-microblaze.git / blobdiff