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hpfs: convert hpfs to use the new mount api
Convert the hpfs filesystem to use the new mount API. Tested by comparing random mount & remount options before and after the change. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Link: https://lore.kernel.org/r/0a066bbb-59ad-17b0-e413-190569f2fea9@redhat.com Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Eric Sandeen
Christian Brauner
parent
945be8ca81
commit
c323cbf720
408
fs/hpfs/super.c
408
fs/hpfs/super.c
@ -9,7 +9,8 @@
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#include "hpfs_fn.h"
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#include <linux/module.h>
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#include <linux/parser.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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#include <linux/init.h>
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#include <linux/statfs.h>
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#include <linux/magic.h>
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@ -90,7 +91,7 @@ void hpfs_error(struct super_block *s, const char *fmt, ...)
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hpfs_sb(s)->sb_was_error = 1;
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}
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/*
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/*
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* A little trick to detect cycles in many hpfs structures and don't let the
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* kernel crash on corrupted filesystem. When first called, set c2 to 0.
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*
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@ -272,146 +273,70 @@ static void destroy_inodecache(void)
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kmem_cache_destroy(hpfs_inode_cachep);
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}
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/*
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* A tiny parser for option strings, stolen from dosfs.
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* Stolen again from read-only hpfs.
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* And updated for table-driven option parsing.
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*/
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enum {
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Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
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Opt_check_none, Opt_check_normal, Opt_check_strict,
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Opt_err_cont, Opt_err_ro, Opt_err_panic,
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Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
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Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
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Opt_timeshift, Opt_err,
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Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case,
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Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift,
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};
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static const match_table_t tokens = {
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{Opt_help, "help"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_umask, "umask=%o"},
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{Opt_case_lower, "case=lower"},
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{Opt_case_asis, "case=asis"},
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{Opt_check_none, "check=none"},
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{Opt_check_normal, "check=normal"},
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{Opt_check_strict, "check=strict"},
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{Opt_err_cont, "errors=continue"},
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{Opt_err_ro, "errors=remount-ro"},
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{Opt_err_panic, "errors=panic"},
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{Opt_eas_no, "eas=no"},
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{Opt_eas_ro, "eas=ro"},
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{Opt_eas_rw, "eas=rw"},
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{Opt_chkdsk_no, "chkdsk=no"},
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{Opt_chkdsk_errors, "chkdsk=errors"},
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{Opt_chkdsk_always, "chkdsk=always"},
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{Opt_timeshift, "timeshift=%d"},
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{Opt_err, NULL},
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static const struct constant_table hpfs_param_case[] = {
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{"asis", 0},
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{"lower", 1},
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{}
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};
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static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
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int *lowercase, int *eas, int *chk, int *errs,
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int *chkdsk, int *timeshift)
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{
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char *p;
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int option;
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static const struct constant_table hpfs_param_check[] = {
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{"none", 0},
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{"normal", 1},
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{"strict", 2},
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{}
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};
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if (!opts)
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return 1;
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static const struct constant_table hpfs_param_err[] = {
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{"continue", 0},
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{"remount-ro", 1},
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{"panic", 2},
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{}
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};
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/*pr_info("Parsing opts: '%s'\n",opts);*/
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static const struct constant_table hpfs_param_eas[] = {
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{"no", 0},
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{"ro", 1},
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{"rw", 2},
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{}
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};
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while ((p = strsep(&opts, ",")) != NULL) {
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substring_t args[MAX_OPT_ARGS];
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int token;
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if (!*p)
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continue;
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static const struct constant_table hpfs_param_chkdsk[] = {
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{"no", 0},
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{"errors", 1},
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{"always", 2},
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{}
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};
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_help:
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return 2;
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case Opt_uid:
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if (match_int(args, &option))
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return 0;
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*uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(*uid))
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return 0;
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break;
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case Opt_gid:
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if (match_int(args, &option))
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return 0;
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*gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(*gid))
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return 0;
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break;
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case Opt_umask:
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if (match_octal(args, &option))
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return 0;
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*umask = option;
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break;
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case Opt_case_lower:
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*lowercase = 1;
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break;
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case Opt_case_asis:
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*lowercase = 0;
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break;
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case Opt_check_none:
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*chk = 0;
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break;
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case Opt_check_normal:
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*chk = 1;
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break;
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case Opt_check_strict:
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*chk = 2;
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break;
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case Opt_err_cont:
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*errs = 0;
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break;
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case Opt_err_ro:
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*errs = 1;
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break;
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case Opt_err_panic:
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*errs = 2;
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break;
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case Opt_eas_no:
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*eas = 0;
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break;
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case Opt_eas_ro:
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*eas = 1;
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break;
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case Opt_eas_rw:
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*eas = 2;
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break;
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case Opt_chkdsk_no:
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*chkdsk = 0;
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break;
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case Opt_chkdsk_errors:
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*chkdsk = 1;
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break;
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case Opt_chkdsk_always:
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*chkdsk = 2;
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break;
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case Opt_timeshift:
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{
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int m = 1;
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char *rhs = args[0].from;
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if (!rhs || !*rhs)
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return 0;
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if (*rhs == '-') m = -1;
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if (*rhs == '+' || *rhs == '-') rhs++;
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*timeshift = simple_strtoul(rhs, &rhs, 0) * m;
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if (*rhs)
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return 0;
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break;
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}
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default:
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return 0;
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}
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}
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return 1;
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}
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static const struct fs_parameter_spec hpfs_param_spec[] = {
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fsparam_flag ("help", Opt_help),
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fsparam_uid ("uid", Opt_uid),
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fsparam_gid ("gid", Opt_gid),
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fsparam_u32oct ("umask", Opt_umask),
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fsparam_enum ("case", Opt_case, hpfs_param_case),
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fsparam_enum ("check", Opt_check, hpfs_param_check),
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fsparam_enum ("errors", Opt_err, hpfs_param_err),
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fsparam_enum ("eas", Opt_eas, hpfs_param_eas),
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fsparam_enum ("chkdsk", Opt_chkdsk, hpfs_param_chkdsk),
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fsparam_s32 ("timeshift", Opt_timeshift),
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{}
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};
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struct hpfs_fc_context {
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kuid_t uid;
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kgid_t gid;
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umode_t umask;
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int lowercase;
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int eas;
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int chk;
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int errs;
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int chkdsk;
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int timeshift;
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};
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static inline void hpfs_help(void)
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{
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@ -439,49 +364,92 @@ HPFS filesystem options:\n\
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\n");
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}
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static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
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static int hpfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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kuid_t uid;
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kgid_t gid;
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umode_t umask;
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int lowercase, eas, chk, errs, chkdsk, timeshift;
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int o;
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struct hpfs_fc_context *ctx = fc->fs_private;
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struct fs_parse_result result;
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int opt;
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opt = fs_parse(fc, hpfs_param_spec, param, &result);
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if (opt < 0)
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return opt;
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switch (opt) {
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case Opt_help:
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hpfs_help();
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return -EINVAL;
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case Opt_uid:
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ctx->uid = result.uid;
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break;
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case Opt_gid:
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ctx->gid = result.gid;
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break;
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case Opt_umask:
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ctx->umask = result.uint_32;
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break;
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case Opt_case:
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ctx->lowercase = result.uint_32;
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break;
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case Opt_check:
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ctx->chk = result.uint_32;
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break;
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case Opt_err:
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ctx->errs = result.uint_32;
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break;
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case Opt_eas:
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ctx->eas = result.uint_32;
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break;
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case Opt_chkdsk:
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ctx->chkdsk = result.uint_32;
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break;
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case Opt_timeshift:
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{
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int m = 1;
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char *rhs = param->string;
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int timeshift;
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if (*rhs == '-') m = -1;
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if (*rhs == '+' || *rhs == '-') rhs++;
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timeshift = simple_strtoul(rhs, &rhs, 0) * m;
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if (*rhs)
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return -EINVAL;
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ctx->timeshift = timeshift;
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break;
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}
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int hpfs_reconfigure(struct fs_context *fc)
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{
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struct hpfs_fc_context *ctx = fc->fs_private;
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struct super_block *s = fc->root->d_sb;
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struct hpfs_sb_info *sbi = hpfs_sb(s);
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sync_filesystem(s);
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*flags |= SB_NOATIME;
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fc->sb_flags |= SB_NOATIME;
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hpfs_lock(s);
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uid = sbi->sb_uid; gid = sbi->sb_gid;
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umask = 0777 & ~sbi->sb_mode;
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lowercase = sbi->sb_lowercase;
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eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
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errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
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if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
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&eas, &chk, &errs, &chkdsk, ×hift))) {
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pr_err("bad mount options.\n");
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goto out_err;
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}
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if (o == 2) {
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hpfs_help();
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goto out_err;
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}
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if (timeshift != sbi->sb_timeshift) {
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if (ctx->timeshift != sbi->sb_timeshift) {
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pr_err("timeshift can't be changed using remount.\n");
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goto out_err;
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}
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unmark_dirty(s);
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sbi->sb_uid = uid; sbi->sb_gid = gid;
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sbi->sb_mode = 0777 & ~umask;
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sbi->sb_lowercase = lowercase;
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sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
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sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
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sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid;
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sbi->sb_mode = 0777 & ~ctx->umask;
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sbi->sb_lowercase = ctx->lowercase;
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sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk;
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sbi->sb_chkdsk = ctx->chkdsk;
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sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift;
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if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
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if (!(fc->sb_flags & SB_RDONLY)) mark_dirty(s, 1);
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hpfs_unlock(s);
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return 0;
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@ -530,30 +498,24 @@ static const struct super_operations hpfs_sops =
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.evict_inode = hpfs_evict_inode,
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.put_super = hpfs_put_super,
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.statfs = hpfs_statfs,
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.remount_fs = hpfs_remount_fs,
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.show_options = hpfs_show_options,
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};
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static int hpfs_fill_super(struct super_block *s, void *options, int silent)
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static int hpfs_fill_super(struct super_block *s, struct fs_context *fc)
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{
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struct hpfs_fc_context *ctx = fc->fs_private;
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struct buffer_head *bh0, *bh1, *bh2;
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struct hpfs_boot_block *bootblock;
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struct hpfs_super_block *superblock;
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struct hpfs_spare_block *spareblock;
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struct hpfs_sb_info *sbi;
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struct inode *root;
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kuid_t uid;
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kgid_t gid;
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umode_t umask;
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int lowercase, eas, chk, errs, chkdsk, timeshift;
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int silent = fc->sb_flags & SB_SILENT;
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dnode_secno root_dno;
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struct hpfs_dirent *de = NULL;
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struct quad_buffer_head qbh;
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int o;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi) {
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return -ENOMEM;
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@ -563,26 +525,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
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mutex_init(&sbi->hpfs_mutex);
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hpfs_lock(s);
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uid = current_uid();
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gid = current_gid();
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umask = current_umask();
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lowercase = 0;
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eas = 2;
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chk = 1;
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errs = 1;
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chkdsk = 1;
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timeshift = 0;
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if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
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&eas, &chk, &errs, &chkdsk, ×hift))) {
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pr_err("bad mount options.\n");
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goto bail0;
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}
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if (o==2) {
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hpfs_help();
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goto bail0;
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}
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/*sbi->sb_mounting = 1;*/
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sb_set_blocksize(s, 512);
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sbi->sb_fs_size = -1;
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@ -622,17 +564,17 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
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sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
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sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
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sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
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sbi->sb_uid = uid;
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sbi->sb_gid = gid;
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sbi->sb_mode = 0777 & ~umask;
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sbi->sb_uid = ctx->uid;
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sbi->sb_gid = ctx->gid;
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sbi->sb_mode = 0777 & ~ctx->umask;
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sbi->sb_n_free = -1;
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sbi->sb_n_free_dnodes = -1;
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sbi->sb_lowercase = lowercase;
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sbi->sb_eas = eas;
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sbi->sb_chk = chk;
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sbi->sb_chkdsk = chkdsk;
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sbi->sb_err = errs;
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sbi->sb_timeshift = timeshift;
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sbi->sb_lowercase = ctx->lowercase;
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sbi->sb_eas = ctx->eas;
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sbi->sb_chk = ctx->chk;
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sbi->sb_chkdsk = ctx->chkdsk;
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sbi->sb_err = ctx->errs;
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sbi->sb_timeshift = ctx->timeshift;
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sbi->sb_was_error = 0;
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sbi->sb_cp_table = NULL;
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sbi->sb_c_bitmap = -1;
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@ -653,7 +595,7 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
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/* Check for general fs errors*/
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if (spareblock->dirty && !spareblock->old_wrote) {
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if (errs == 2) {
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if (sbi->sb_err == 2) {
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pr_err("Improperly stopped, not mounted\n");
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goto bail4;
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}
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@ -667,16 +609,16 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
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}
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if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
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if (errs >= 2) {
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if (sbi->sb_err >= 2) {
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pr_err("Spare dnodes used, try chkdsk\n");
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mark_dirty(s, 0);
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goto bail4;
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}
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||||
hpfs_error(s, "warning: spare dnodes used, try chkdsk");
|
||||
if (errs == 0)
|
||||
if (sbi->sb_err == 0)
|
||||
pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
|
||||
}
|
||||
if (chk) {
|
||||
if (sbi->sb_chk) {
|
||||
unsigned a;
|
||||
if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
|
||||
le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
|
||||
@ -755,18 +697,70 @@ bail0:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static struct dentry *hpfs_mount(struct file_system_type *fs_type,
|
||||
int flags, const char *dev_name, void *data)
|
||||
static int hpfs_get_tree(struct fs_context *fc)
|
||||
{
|
||||
return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
|
||||
return get_tree_bdev(fc, hpfs_fill_super);
|
||||
}
|
||||
|
||||
static void hpfs_free_fc(struct fs_context *fc)
|
||||
{
|
||||
kfree(fc->fs_private);
|
||||
}
|
||||
|
||||
static const struct fs_context_operations hpfs_fc_context_ops = {
|
||||
.parse_param = hpfs_parse_param,
|
||||
.get_tree = hpfs_get_tree,
|
||||
.reconfigure = hpfs_reconfigure,
|
||||
.free = hpfs_free_fc,
|
||||
};
|
||||
|
||||
static int hpfs_init_fs_context(struct fs_context *fc)
|
||||
{
|
||||
struct hpfs_fc_context *ctx;
|
||||
|
||||
ctx = kzalloc(sizeof(struct hpfs_fc_context), GFP_KERNEL);
|
||||
if (!ctx)
|
||||
return -ENOMEM;
|
||||
|
||||
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
|
||||
struct super_block *sb = fc->root->d_sb;
|
||||
struct hpfs_sb_info *sbi = hpfs_sb(sb);
|
||||
|
||||
ctx->uid = sbi->sb_uid;
|
||||
ctx->gid = sbi->sb_gid;
|
||||
ctx->umask = 0777 & ~sbi->sb_mode;
|
||||
ctx->lowercase = sbi->sb_lowercase;
|
||||
ctx->eas = sbi->sb_eas;
|
||||
ctx->chk = sbi->sb_chk;
|
||||
ctx->chkdsk = sbi->sb_chkdsk;
|
||||
ctx->errs = sbi->sb_err;
|
||||
ctx->timeshift = sbi->sb_timeshift;
|
||||
|
||||
} else {
|
||||
ctx->uid = current_uid();
|
||||
ctx->gid = current_gid();
|
||||
ctx->umask = current_umask();
|
||||
ctx->lowercase = 0;
|
||||
ctx->eas = 2;
|
||||
ctx->chk = 1;
|
||||
ctx->errs = 1;
|
||||
ctx->chkdsk = 1;
|
||||
ctx->timeshift = 0;
|
||||
}
|
||||
|
||||
fc->fs_private = ctx;
|
||||
fc->ops = &hpfs_fc_context_ops;
|
||||
|
||||
return 0;
|
||||
};
|
||||
|
||||
static struct file_system_type hpfs_fs_type = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "hpfs",
|
||||
.mount = hpfs_mount,
|
||||
.kill_sb = kill_block_super,
|
||||
.fs_flags = FS_REQUIRES_DEV,
|
||||
.init_fs_context = hpfs_init_fs_context,
|
||||
.parameters = hpfs_param_spec,
|
||||
};
|
||||
MODULE_ALIAS_FS("hpfs");
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user