[Aufs 08/25] aufs mount options/flags

J. R. Okajima
2009-03-09T03:38:39Z

handling mount options/flags

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
---
fs/aufs/opts.c | 1438 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/opts.h | 180 +++++++
2 files changed, 1618 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/opts.c
create mode 100644 fs/aufs/opts.h

diff --git a/fs/aufs/opts.c b/fs/aufs/opts.c
new file mode 100644
index 0000000..847b8e6
--- /dev/null
+++ b/fs/aufs/opts.c
@@ -0,0 +1,1438 @@
+/*
+ * Copyright (C) 2005-2009 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * mount options/flags
+ */
+
+#include <linux/types.h> /* a distribution requires */
+#include <linux/parser.h>
+#include "aufs.h"
+
+/* ---------------------------------------------------------------------- */
+
+enum {
+ Opt_br,
+ Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend,
+ Opt_idel, Opt_imod, Opt_ireorder,
+ Opt_dirwh, Opt_rdcache, Opt_deblk, Opt_nhash, Opt_rendir,
+ Opt_xino, Opt_zxino, Opt_noxino,
+ Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino,
+ Opt_trunc_xino_path, Opt_itrunc_xino,
+ Opt_trunc_xib, Opt_notrunc_xib,
+ Opt_plink, Opt_noplink, Opt_list_plink,
+ Opt_udba,
+ /* Opt_lock, Opt_unlock, */
+ Opt_cmd, Opt_cmd_args,
+ Opt_diropq_a, Opt_diropq_w,
+ Opt_warn_perm, Opt_nowarn_perm,
+ Opt_wbr_copyup, Opt_wbr_create,
+ Opt_refrof, Opt_norefrof,
+ Opt_verbose, Opt_noverbose,
+ Opt_sum, Opt_nosum, Opt_wsum,
+ Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err
+};
+
+static match_table_t options = {
+ {Opt_br, "br=%s"},
+ {Opt_br, "br:%s"},
+
+ {Opt_add, "add=%d:%s"},
+ {Opt_add, "add:%d:%s"},
+ {Opt_add, "ins=%d:%s"},
+ {Opt_add, "ins:%d:%s"},
+ {Opt_append, "append=%s"},
+ {Opt_append, "append:%s"},
+ {Opt_prepend, "prepend=%s"},
+ {Opt_prepend, "prepend:%s"},
+
+ {Opt_del, "del=%s"},
+ {Opt_del, "del:%s"},
+ /* {Opt_idel, "idel:%d"}, */
+ {Opt_mod, "mod=%s"},
+ {Opt_mod, "mod:%s"},
+ /* {Opt_imod, "imod:%d:%s"}, */
+
+ {Opt_dirwh, "dirwh=%d"},
+
+ {Opt_xino, "xino=%s"},
+ {Opt_noxino, "noxino"},
+ {Opt_trunc_xino, "trunc_xino"},
+ {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"},
+ {Opt_notrunc_xino, "notrunc_xino"},
+ {Opt_trunc_xino_path, "trunc_xino=%s"},
+ {Opt_itrunc_xino, "itrunc_xino=%d"},
+ /* {Opt_zxino, "zxino=%s"}, */
+ {Opt_trunc_xib, "trunc_xib"},
+ {Opt_notrunc_xib, "notrunc_xib"},
+
+ {Opt_plink, "plink"},
+ {Opt_noplink, "noplink"},
+#ifdef CONFIG_AUFS_DEBUG
+ {Opt_list_plink, "list_plink"},
+#endif
+
+ {Opt_udba, "udba=%s"},
+
+ {Opt_diropq_a, "diropq=always"},
+ {Opt_diropq_a, "diropq=a"},
+ {Opt_diropq_w, "diropq=whiteouted"},
+ {Opt_diropq_w, "diropq=w"},
+
+ {Opt_warn_perm, "warn_perm"},
+ {Opt_nowarn_perm, "nowarn_perm"},
+
+ /* keep them temporary */
+ {Opt_ignore_silent, "coo=%s"},
+ {Opt_ignore_silent, "nodlgt"},
+ {Opt_ignore_silent, "nodirperm1"},
+ {Opt_ignore_silent, "noshwh"},
+ {Opt_ignore_silent, "noshwh"},
+ {Opt_ignore_silent, "clean_plink"},
+
+ {Opt_rendir, "rendir=%d"},
+
+ {Opt_refrof, "refrof"},
+ {Opt_norefrof, "norefrof"},
+
+ {Opt_verbose, "verbose"},
+ {Opt_verbose, "v"},
+ {Opt_noverbose, "noverbose"},
+ {Opt_noverbose, "quiet"},
+ {Opt_noverbose, "q"},
+ {Opt_noverbose, "silent"},
+
+ {Opt_sum, "sum"},
+ {Opt_nosum, "nosum"},
+ {Opt_wsum, "wsum"},
+
+ {Opt_rdcache, "rdcache=%d"},
+ {Opt_rdcache, "rdcache:%d"},
+
+ {Opt_wbr_create, "create=%s"},
+ {Opt_wbr_create, "create_policy=%s"},
+ {Opt_wbr_copyup, "cpup=%s"},
+ {Opt_wbr_copyup, "copyup=%s"},
+ {Opt_wbr_copyup, "copyup_policy=%s"},
+
+ /* internal use for the scripts */
+ {Opt_ignore_silent, "si=%s"},
+
+ {Opt_br, "dirs=%s"},
+ {Opt_ignore, "debug=%d"},
+ {Opt_ignore, "delete=whiteout"},
+ {Opt_ignore, "delete=all"},
+ {Opt_ignore, "imap=%s"},
+
+ {Opt_err, NULL}
+};
+
+/* ---------------------------------------------------------------------- */
+
+static const char *au_parser_pattern(int val, struct match_token *token)
+{
+ while (token->pattern) {
+ if (token->token == val)
+ return token->pattern;
+ token++;
+ }
+ BUG();
+ return "??";
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t brperms = {
+ {AuBrPerm_RO, AUFS_BRPERM_RO},
+ {AuBrPerm_RR, AUFS_BRPERM_RR},
+ {AuBrPerm_RW, AUFS_BRPERM_RW},
+
+ {AuBrPerm_ROWH, AUFS_BRPERM_ROWH},
+ {AuBrPerm_RRWH, AUFS_BRPERM_RRWH},
+ {AuBrPerm_RWNoLinkWH, AUFS_BRPERM_RWNLWH},
+
+ {AuBrPerm_ROWH, "nfsro"},
+ {AuBrPerm_RO, NULL}
+};
+
+static int br_perm_val(char *perm)
+{
+ int val;
+ substring_t args[MAX_OPT_ARGS];
+
+ val = match_token(perm, brperms, args);
+ return val;
+}
+
+const char *au_optstr_br_perm(int brperm)
+{
+ return au_parser_pattern(brperm, (void *)brperms);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t udbalevel = {
+ {AuOpt_UDBA_REVAL, "reval"},
+ {AuOpt_UDBA_NONE, "none"},
+#ifdef CONFIG_AUFS_HINOTIFY
+ {AuOpt_UDBA_HINOTIFY, "inotify"},
+#endif
+ {-1, NULL}
+};
+
+static int udba_val(char *str)
+{
+ substring_t args[MAX_OPT_ARGS];
+
+ return match_token(str, udbalevel, args);
+}
+
+const char *au_optstr_udba(int udba)
+{
+ return au_parser_pattern(udba, (void *)udbalevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t au_wbr_create_policy = {
+ {AuWbrCreate_TDP, "tdp"},
+ {AuWbrCreate_TDP, "top-down-parent"},
+ {AuWbrCreate_RR, "rr"},
+ {AuWbrCreate_RR, "round-robin"},
+ {AuWbrCreate_MFS, "mfs"},
+ {AuWbrCreate_MFS, "most-free-space"},
+ {AuWbrCreate_MFSV, "mfs:%d"},
+ {AuWbrCreate_MFSV, "most-free-space:%d"},
+
+ {AuWbrCreate_MFSRR, "mfsrr:%d"},
+ {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"},
+ {AuWbrCreate_PMFS, "pmfs"},
+ {AuWbrCreate_PMFSV, "pmfs:%d"},
+
+ {-1, NULL}
+};
+
+/* cf. linux/lib/parser.c */
+static int au_match_ull(substring_t *s, unsigned long long *result)
+{
+ int err;
+ unsigned int len;
+ char a[32];
+
+ err = -ERANGE;
+ len = s->to - s->from;
+ if (len + 1 <= sizeof(a)) {
+ memcpy(a, s->from, len);
+ a[len] = '\0';
+ err = strict_strtoull(a, 0, result);
+ }
+ return err;
+}
+
+static int au_wbr_mfs_wmark(substring_t *arg, char *str,
+ struct au_opt_wbr_create *create)
+{
+ int err;
+ unsigned long long ull;
+
+ err = 0;
+ if (!au_match_ull(arg, &ull))
+ create->mfsrr_watermark = ull;
+ else {
+ AuErr("bad integer in %s\n", str);
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+static int au_wbr_mfs_sec(substring_t *arg, char *str,
+ struct au_opt_wbr_create *create)
+{
+ int n, err;
+
+ err = 0;
+ if (!match_int(arg, &n) && 0 <= n)
+ create->mfs_second = n;
+ else {
+ AuErr("bad integer in %s\n", str);
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+static int au_wbr_create_val(char *str, struct au_opt_wbr_create *create)
+{
+ int err, e;
+ substring_t args[MAX_OPT_ARGS];
+
+ err = match_token(str, au_wbr_create_policy, args);
+ create->wbr_create = err;
+ switch (err) {
+ case AuWbrCreate_MFSRRV:
+ e = au_wbr_mfs_wmark(&args[0], str, create);
+ if (!e)
+ e = au_wbr_mfs_sec(&args[1], str, create);
+ if (unlikely(e))
+ err = e;
+ break;
+ case AuWbrCreate_MFSRR:
+ e = au_wbr_mfs_wmark(&args[0], str, create);
+ if (unlikely(e)) {
+ err = e;
+ break;
+ }
+ /*FALLTHROUGH*/
+ case AuWbrCreate_MFS:
+ case AuWbrCreate_PMFS:
+ create->mfs_second = AUFS_MFS_SECOND_DEF;
+ break;
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFSV:
+ e = au_wbr_mfs_sec(&args[0], str, create);
+ if (unlikely(e))
+ err = e;
+ break;
+ }
+
+ return err;
+}
+
+const char *au_optstr_wbr_create(int wbr_create)
+{
+ return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy);
+}
+
+static match_table_t au_wbr_copyup_policy = {
+ {AuWbrCopyup_TDP, "tdp"},
+ {AuWbrCopyup_TDP, "top-down-parent"},
+ {AuWbrCopyup_BUP, "bup"},
+ {AuWbrCopyup_BUP, "bottom-up-parent"},
+ {AuWbrCopyup_BU, "bu"},
+ {AuWbrCopyup_BU, "bottom-up"},
+ {-1, NULL}
+};
+
+static int au_wbr_copyup_val(char *str)
+{
+ substring_t args[MAX_OPT_ARGS];
+
+ return match_token(str, au_wbr_copyup_policy, args);
+}
+
+const char *au_optstr_wbr_copyup(int wbr_copyup)
+{
+ return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+
+static void dump_opts(struct au_opts *opts)
+{
+#ifdef CONFIG_AUFS_DEBUG
+ /* reduce stack space */
+ union {
+ struct au_opt_add *add;
+ struct au_opt_del *del;
+ struct au_opt_mod *mod;
+ struct au_opt_xino *xino;
+ struct au_opt_xino_itrunc *xino_itrunc;
+ struct au_opt_wbr_create *create;
+ } u;
+ struct au_opt *opt;
+
+ opt = opts->opt;
+ while (opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ u.add = &opt->add;
+ AuDbg("add {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ u.del = &opt->del;
+ AuDbg("del {%s, %p}\n",
+ u.del->pathname, u.del->h_path.dentry);
+ break;
+ case Opt_mod:
+ case Opt_imod:
+ u.mod = &opt->mod;
+ AuDbg("mod {%s, 0x%x, %p}\n",
+ u.mod->path, u.mod->perm, u.mod->h_root);
+ break;
+ case Opt_append:
+ u.add = &opt->add;
+ AuDbg("append {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_prepend:
+ u.add = &opt->add;
+ AuDbg("prepend {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->pathname, u.add->perm,
+ u.add->path.dentry);
+ break;
+ case Opt_dirwh:
+ AuDbg("dirwh %d\n", opt->dirwh);
+ break;
+ case Opt_rdcache:
+ AuDbg("rdcache %d\n", opt->rdcache);
+ break;
+ case Opt_xino:
+ u.xino = &opt->xino;
+ AuDbg("xino {%s %.*s}\n",
+ u.xino->path,
+ AuDLNPair(u.xino->file->f_dentry));
+ break;
+ case Opt_trunc_xino:
+ AuLabel(trunc_xino);
+ break;
+ case Opt_notrunc_xino:
+ AuLabel(notrunc_xino);
+ break;
+ case Opt_trunc_xino_path:
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex);
+ break;
+
+ case Opt_noxino:
+ AuLabel(noxino);
+ break;
+ case Opt_trunc_xib:
+ AuLabel(trunc_xib);
+ break;
+ case Opt_notrunc_xib:
+ AuLabel(notrunc_xib);
+ break;
+ case Opt_plink:
+ AuLabel(plink);
+ break;
+ case Opt_noplink:
+ AuLabel(noplink);
+ break;
+ case Opt_list_plink:
+ AuLabel(list_plink);
+ break;
+ case Opt_udba:
+ AuDbg("udba %d, %s\n",
+ opt->udba, au_optstr_udba(opt->udba));
+ break;
+ case Opt_diropq_a:
+ AuLabel(diropq_a);
+ break;
+ case Opt_diropq_w:
+ AuLabel(diropq_w);
+ break;
+ case Opt_warn_perm:
+ AuLabel(warn_perm);
+ break;
+ case Opt_nowarn_perm:
+ AuLabel(nowarn_perm);
+ break;
+ case Opt_refrof:
+ AuLabel(refrof);
+ break;
+ case Opt_norefrof:
+ AuLabel(norefrof);
+ break;
+ case Opt_verbose:
+ AuLabel(verbose);
+ break;
+ case Opt_noverbose:
+ AuLabel(noverbose);
+ break;
+ case Opt_sum:
+ AuLabel(sum);
+ break;
+ case Opt_nosum:
+ AuLabel(nosum);
+ break;
+ case Opt_wsum:
+ AuLabel(wsum);
+ break;
+ case Opt_wbr_create:
+ u.create = &opt->wbr_create;
+ AuDbg("create %d, %s\n", u.create->wbr_create,
+ au_optstr_wbr_create(u.create->wbr_create));
+ switch (u.create->wbr_create) {
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFSV:
+ AuDbg("%d sec\n", u.create->mfs_second);
+ break;
+ case AuWbrCreate_MFSRR:
+ AuDbg("%llu watermark\n",
+ u.create->mfsrr_watermark);
+ break;
+ case AuWbrCreate_MFSRRV:
+ AuDbg("%llu watermark, %d sec\n",
+ u.create->mfsrr_watermark,
+ u.create->mfs_second);
+ break;
+ }
+ break;
+ case Opt_wbr_copyup:
+ AuDbg("copyup %d, %s\n", opt->wbr_copyup,
+ au_optstr_wbr_copyup(opt->wbr_copyup));
+ break;
+ default:
+ BUG();
+ }
+ opt++;
+ }
+#endif
+}
+
+void au_opts_free(struct au_opts *opts)
+{
+ struct au_opt *opt;
+
+ opt = opts->opt;
+ while (opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ case Opt_append:
+ case Opt_prepend:
+ path_put(&opt->add.path);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ path_put(&opt->del.h_path);
+ break;
+ case Opt_mod:
+ case Opt_imod:
+ dput(opt->mod.h_root);
+ break;
+ case Opt_xino:
+ fput(opt->xino.file);
+ break;
+ }
+ opt++;
+ }
+}
+
+static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags,
+ aufs_bindex_t bindex)
+{
+ int err;
+ struct au_opt_add *add = &opt->add;
+ char *p;
+
+ add->bindex = bindex;
+ add->perm = AuBrPerm_Last;
+ add->pathname = opt_str;
+ p = strchr(opt_str, '=');
+ if (p) {
+ *p++ = 0;
+ if (*p)
+ add->perm = br_perm_val(p);
+ }
+
+ err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path);
+ if (!err) {
+ if (!p) {
+ add->perm = AuBrPerm_RO;
+ if (au_test_fs_rr(add->path.dentry->d_sb))
+ add->perm = AuBrPerm_RR;
+ else if (!bindex && !(sb_flags & MS_RDONLY))
+ add->perm = AuBrPerm_RW;
+ }
+ opt->type = Opt_add;
+ goto out;
+ }
+ AuErr("lookup failed %s (%d)\n", add->pathname, err);
+ err = -EINVAL;
+
+ out:
+ return err;
+}
+
+static int au_opts_parse_del(struct au_opt_del *del, substring_t args[])
+{
+ int err;
+
+ del->pathname = args[0].from;
+ AuDbg("del path %s\n", del->pathname);
+
+ err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path);
+ if (unlikely(err))
+ AuErr("lookup failed %s (%d)\n", del->pathname, err);
+
+ return err;
+}
+
+#if 0 /* reserved for future use */
+static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex,
+ struct au_opt_del *del, substring_t args[])
+{
+ int err;
+ struct dentry *root;
+
+ err = -EINVAL;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ AuErr("out of bounds, %d\n", bindex);
+ goto out;
+ }
+
+ err = 0;
+ del->h_path.dentry = dget(au_h_dptr(root, bindex));
+ del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex));
+
+ out:
+ aufs_read_unlock(root, !AuLock_IR);
+ return err;
+}
+#endif
+
+static int au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[])
+{
+ int err;
+ struct path path;
+ char *p;
+
+ err = -EINVAL;
+ mod->path = args[0].from;
+ p = strchr(mod->path, '=');
+ if (unlikely(!p)) {
+ AuErr("no permssion %s\n", args[0].from);
+ goto out;
+ }
+
+ *p++ = 0;
+ err = vfsub_kern_path(mod->path, lkup_dirflags, &path);
+ if (unlikely(err)) {
+ AuErr("lookup failed %s (%d)\n", mod->path, err);
+ goto out;
+ }
+
+ mod->perm = br_perm_val(p);
+ AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p);
+ mod->h_root = dget(path.dentry);
+ path_put(&path);
+
+ out:
+ return err;
+}
+
+#if 0 /* reserved for future use */
+static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex,
+ struct au_opt_mod *mod, substring_t args[])
+{
+ int err;
+ struct dentry *root;
+
+ err = -EINVAL;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ AuErr("out of bounds, %d\n", bindex);
+ goto out;
+ }
+
+ err = 0;
+ mod->perm = br_perm_val(args[1].from);
+ AuDbg("mod path %s, perm 0x%x, %s\n",
+ mod->path, mod->perm, args[1].from);
+ mod->h_root = dget(au_h_dptr(root, bindex));
+
+ out:
+ aufs_read_unlock(root, !AuLock_IR);
+ return err;
+}
+#endif
+
+static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino,
+ substring_t args[])
+{
+ int err;
+ struct file *file;
+
+ file = au_xino_create(sb, args[0].from, /*silent*/0);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ goto out;
+
+ err = -EINVAL;
+ if (unlikely(file->f_dentry->d_sb == sb)) {
+ fput(file);
+ AuErr("%s must be outside\n", args[0].from);
+ goto out;
+ }
+
+ err = 0;
+ xino->file = file;
+ xino->path = args[0].from;
+
+ out:
+ return err;
+}
+
+static
+int au_opts_parse_xino_itrunc_path(struct super_block *sb,
+ struct au_opt_xino_itrunc *xino_itrunc,
+ substring_t args[])
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct path path;
+ struct dentry *root;
+
+ err = vfsub_kern_path(args[0].from, lkup_dirflags, &path);
+ if (unlikely(err)) {
+ AuErr("lookup failed %s (%d)\n", args[0].from, err);
+ goto out;
+ }
+
+ xino_itrunc->bindex = -1;
+ root = sb->s_root;
+ aufs_read_lock(root, AuLock_FLUSH);
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ if (au_h_dptr(root, bindex) == path.dentry) {
+ xino_itrunc->bindex = bindex;
+ break;
+ }
+ }
+ aufs_read_unlock(root, !AuLock_IR);
+ path_put(&path);
+
+ if (unlikely(xino_itrunc->bindex < 0)) {
+ AuErr("no such branch %s\n", args[0].from);
+ err = -EINVAL;
+ }
+
+ out:
+ return err;
+}
+
+/* called without aufs lock */
+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts)
+{
+ int err, n, token;
+ aufs_bindex_t bindex;
+ unsigned char skipped;
+ struct dentry *root;
+ struct au_opt *opt, *opt_tail;
+ char *opt_str;
+ /* reduce the stack space */
+ union {
+ struct au_opt_xino_itrunc *xino_itrunc;
+ struct au_opt_wbr_create *create;
+ } u;
+ struct {
+ substring_t args[MAX_OPT_ARGS];
+ } *a;
+
+ err = -ENOMEM;
+ a = kmalloc(sizeof(*a), GFP_NOFS);
+ if (unlikely(!a))
+ goto out;
+
+ root = sb->s_root;
+ err = 0;
+ bindex = 0;
+ opt = opts->opt;
+ opt_tail = opt + opts->max_opt - 1;
+ opt->type = Opt_tail;
+ while (!err && (opt_str = strsep(&str, ",")) && *opt_str) {
+ err = -EINVAL;
+ skipped = 0;
+ token = match_token(opt_str, options, a->args);
+ switch (token) {
+ case Opt_br:
+ err = 0;
+ while (!err && (opt_str = strsep(&a->args[0].from, ":"))
+ && *opt_str) {
+ err = opt_add(opt, opt_str, opts->sb_flags,
+ bindex++);
+ if (unlikely(!err && ++opt > opt_tail)) {
+ err = -E2BIG;
+ break;
+ }
+ opt->type = Opt_tail;
+ skipped = 1;
+ }
+ break;
+ case Opt_add:
+ if (unlikely(match_int(&a->args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ bindex = n;
+ err = opt_add(opt, a->args[1].from, opts->sb_flags,
+ bindex);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_append:
+ err = opt_add(opt, a->args[0].from, opts->sb_flags,
+ /*dummy bindex*/1);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_prepend:
+ err = opt_add(opt, a->args[0].from, opts->sb_flags,
+ /*bindex*/0);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_del:
+ err = au_opts_parse_del(&opt->del, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#if 0 /* reserved for future use */
+ case Opt_idel:
+ del->pathname = "(indexed)";
+ if (unlikely(match_int(&args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ err = au_opts_parse_idel(sb, n, &opt->del, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#endif
+ case Opt_mod:
+ err = au_opts_parse_mod(&opt->mod, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#ifdef IMOD /* reserved for future use */
+ case Opt_imod:
+ u.mod->path = "(indexed)";
+ if (unlikely(match_int(&a->args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ err = au_opts_parse_imod(sb, n, &opt->mod, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+#endif
+ case Opt_xino:
+ err = au_opts_parse_xino(sb, &opt->xino, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+
+ case Opt_trunc_xino_path:
+ err = au_opts_parse_xino_itrunc_path
+ (sb, &opt->xino_itrunc, a->args);
+ if (!err)
+ opt->type = token;
+ break;
+
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ if (unlikely(match_int(&a->args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ u.xino_itrunc->bindex = n;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (n < 0 || au_sbend(sb) < n) {
+ AuErr("out of bounds, %d\n", n);
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+ }
+ aufs_read_unlock(root, !AuLock_IR);
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_dirwh:
+ if (unlikely(match_int(&a->args[0], &opt->dirwh)))
+ break;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_rdcache:
+ if (unlikely(match_int(&a->args[0], &opt->rdcache)))
+ break;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_trunc_xino:
+ case Opt_notrunc_xino:
+ case Opt_noxino:
+ case Opt_trunc_xib:
+ case Opt_notrunc_xib:
+ case Opt_plink:
+ case Opt_noplink:
+ case Opt_list_plink:
+ case Opt_diropq_a:
+ case Opt_diropq_w:
+ case Opt_warn_perm:
+ case Opt_nowarn_perm:
+ case Opt_refrof:
+ case Opt_norefrof:
+ case Opt_verbose:
+ case Opt_noverbose:
+ case Opt_sum:
+ case Opt_nosum:
+ case Opt_wsum:
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_udba:
+ opt->udba = udba_val(a->args[0].from);
+ if (opt->udba >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_wbr_create:
+ u.create = &opt->wbr_create;
+ u.create->wbr_create
+ = au_wbr_create_val(a->args[0].from, u.create);
+ if (u.create->wbr_create >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("wrong value, %s\n", opt_str);
+ break;
+ case Opt_wbr_copyup:
+ opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from);
+ if (opt->wbr_copyup >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_ignore:
+ AuWarn("ignored %s\n", opt_str);
+ /*FALLTHROUGH*/
+ case Opt_ignore_silent:
+ skipped = 1;
+ err = 0;
+ break;
+ case Opt_err:
+ AuErr("unknown option %s\n", opt_str);
+ break;
+ }
+
+ if (!err && !skipped) {
+ if (unlikely(++opt > opt_tail)) {
+ err = -E2BIG;
+ opt--;
+ opt->type = Opt_tail;
+ break;
+ }
+ opt->type = Opt_tail;
+ }
+ }
+
+ kfree(a);
+ dump_opts(opts);
+ if (unlikely(err))
+ au_opts_free(opts);
+
+ out:
+ return err;
+}
+
+static int au_opt_wbr_create(struct super_block *sb,
+ struct au_opt_wbr_create *create)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ err = 1; /* handled */
+ sbinfo = au_sbi(sb);
+ if (sbinfo->si_wbr_create_ops->fin) {
+ err = sbinfo->si_wbr_create_ops->fin(sb);
+ if (!err)
+ err = 1;
+ }
+
+ sbinfo->si_wbr_create = create->wbr_create;
+ sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create;
+ switch (create->wbr_create) {
+ case AuWbrCreate_MFSRRV:
+ case AuWbrCreate_MFSRR:
+ sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark;
+ /*FALLTHROUGH*/
+ case AuWbrCreate_MFS:
+ case AuWbrCreate_MFSV:
+ case AuWbrCreate_PMFS:
+ case AuWbrCreate_PMFSV:
+ sbinfo->si_wbr_mfs.mfs_expire = create->mfs_second * HZ;
+ break;
+ }
+
+ if (sbinfo->si_wbr_create_ops->init)
+ sbinfo->si_wbr_create_ops->init(sb); /* ignore */
+
+ return err;
+}
+
+/*
+ * returns,
+ * plus: processed without an error
+ * zero: unprocessed
+ */
+static int au_opt_simple(struct super_block *sb, struct au_opt *opt,
+ struct au_opts *opts)
+{
+ int err;
+ struct au_sbinfo *sbinfo;
+
+ err = 1; /* handled */
+ sbinfo = au_sbi(sb);
+ switch (opt->type) {
+ case Opt_udba:
+ sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+ sbinfo->si_mntflags |= opt->udba;
+ opts->given_udba |= opt->udba;
+ break;
+
+ case Opt_plink:
+ au_opt_set(sbinfo->si_mntflags, PLINK);
+ break;
+ case Opt_noplink:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_put(sb);
+ au_opt_clr(sbinfo->si_mntflags, PLINK);
+ break;
+ case Opt_list_plink:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_list(sb);
+ break;
+
+ case Opt_diropq_a:
+ au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+ break;
+ case Opt_diropq_w:
+ au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ);
+ break;
+
+ case Opt_warn_perm:
+ au_opt_set(sbinfo->si_mntflags, WARN_PERM);
+ break;
+ case Opt_nowarn_perm:
+ au_opt_clr(sbinfo->si_mntflags, WARN_PERM);
+ break;
+
+ case Opt_refrof:
+ au_opt_set(sbinfo->si_mntflags, REFROF);
+ break;
+ case Opt_norefrof:
+ au_opt_clr(sbinfo->si_mntflags, REFROF);
+ break;
+
+ case Opt_verbose:
+ au_opt_set(sbinfo->si_mntflags, VERBOSE);
+ break;
+ case Opt_noverbose:
+ au_opt_clr(sbinfo->si_mntflags, VERBOSE);
+ break;
+
+ case Opt_sum:
+ au_opt_set(sbinfo->si_mntflags, SUM);
+ break;
+ case Opt_wsum:
+ au_opt_clr(sbinfo->si_mntflags, SUM);
+ au_opt_set(sbinfo->si_mntflags, SUM_W);
+ case Opt_nosum:
+ au_opt_clr(sbinfo->si_mntflags, SUM);
+ au_opt_clr(sbinfo->si_mntflags, SUM_W);
+ break;
+
+ case Opt_wbr_create:
+ err = au_opt_wbr_create(sb, &opt->wbr_create);
+ break;
+ case Opt_wbr_copyup:
+ sbinfo->si_wbr_copyup = opt->wbr_copyup;
+ sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup;
+ break;
+
+ case Opt_dirwh:
+ sbinfo->si_dirwh = opt->dirwh;
+ break;
+
+ case Opt_rdcache:
+ sbinfo->si_rdcache = opt->rdcache * HZ;
+ break;
+
+ case Opt_trunc_xino:
+ au_opt_set(sbinfo->si_mntflags, TRUNC_XINO);
+ break;
+ case Opt_notrunc_xino:
+ au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO);
+ break;
+
+ case Opt_trunc_xino_path:
+ case Opt_itrunc_xino:
+ err = au_xino_trunc(sb, opt->xino_itrunc.bindex);
+ if (!err)
+ err = 1;
+ break;
+
+ case Opt_trunc_xib:
+ au_fset_opts(opts->flags, TRUNC_XIB);
+ break;
+ case Opt_notrunc_xib:
+ au_fclr_opts(opts->flags, TRUNC_XIB);
+ break;
+
+ default:
+ err = 0;
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * returns tri-state.
+ * plus: processed without an error
+ * zero: unprocessed
+ * minus: error
+ */
+static int au_opt_br(struct super_block *sb, struct au_opt *opt,
+ struct au_opts *opts)
+{
+ int err, do_refresh;
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_append:
+ opt->add.bindex = au_sbend(sb) + 1;
+ if (opt->add.bindex < 0)
+ opt->add.bindex = 0;
+ goto add;
+ case Opt_prepend:
+ opt->add.bindex = 0;
+ add:
+ case Opt_add:
+ err = au_br_add(sb, &opt->add,
+ au_ftest_opts(opts->flags, REMOUNT));
+ if (!err) {
+ err = 1;
+ au_fset_opts(opts->flags, REFRESH_DIR);
+ if (au_br_whable(opt->add.perm))
+ au_fset_opts(opts->flags, REFRESH_NONDIR);
+ }
+ break;
+
+ case Opt_del:
+ case Opt_idel:
+ err = au_br_del(sb, &opt->del,
+ au_ftest_opts(opts->flags, REMOUNT));
+ if (!err) {
+ err = 1;
+ au_fset_opts(opts->flags, TRUNC_XIB);
+ au_fset_opts(opts->flags, REFRESH_DIR);
+ au_fset_opts(opts->flags, REFRESH_NONDIR);
+ }
+ break;
+
+ case Opt_mod:
+ case Opt_imod:
+ err = au_br_mod(sb, &opt->mod,
+ au_ftest_opts(opts->flags, REMOUNT),
+ &do_refresh);
+ if (!err) {
+ err = 1;
+ if (do_refresh) {
+ au_fset_opts(opts->flags, REFRESH_DIR);
+ au_fset_opts(opts->flags, REFRESH_NONDIR);
+ }
+ }
+ break;
+ }
+
+ return err;
+}
+
+static int au_opt_xino(struct super_block *sb, struct au_opt *opt,
+ struct au_opt_xino **opt_xino,
+ struct au_opts *opts)
+{
+ int err;
+ aufs_bindex_t bend, bindex;
+ struct dentry *root, *parent, *h_root;
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_xino:
+ err = au_xino_set(sb, &opt->xino,
+ !!au_ftest_opts(opts->flags, REMOUNT));
+ if (unlikely(err))
+ break;
+
+ *opt_xino = &opt->xino;
+ au_xino_brid_set(sb, -1);
+
+ /* safe d_parent access */
+ parent = opt->xino.file->f_dentry->d_parent;
+ root = sb->s_root;
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ h_root = au_h_dptr(root, bindex);
+ if (h_root == parent) {
+ au_xino_brid_set(sb, au_sbr_id(sb, bindex));
+ break;
+ }
+ }
+ break;
+
+ case Opt_noxino:
+ au_xino_clr(sb);
+ au_xino_brid_set(sb, -1);
+ *opt_xino = (void *)-1;
+ break;
+ }
+
+ return err;
+}
+
+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
+ unsigned int pending)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ unsigned char do_plink, skip, do_free;
+ struct au_branch *br;
+ struct au_wbr *wbr;
+ struct dentry *root;
+ struct inode *dir, *h_dir;
+ struct au_sbinfo *sbinfo;
+ struct au_hinode *hdir;
+
+ sbinfo = au_sbi(sb);
+ AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA));
+
+ if (unlikely(!(sb_flags & MS_RDONLY)
+ && !au_br_writable(au_sbr_perm(sb, 0))))
+ AuWarn("first branch should be rw\n");
+
+ if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HINOTIFY)
+ && !au_opt_test(sbinfo->si_mntflags, XINO))
+ AuWarn("udba=inotify requires xino\n");
+
+ err = 0;
+ root = sb->s_root;
+ dir = sb->s_root->d_inode;
+ do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK);
+ bend = au_sbend(sb);
+ for (bindex = 0; !err && bindex <= bend; bindex++) {
+ skip = 0;
+ h_dir = au_h_iptr(dir, bindex);
+ br = au_sbr(sb, bindex);
+ do_free = 0;
+
+ wbr = br->br_wbr;
+ if (wbr)
+ wbr_wh_read_lock(wbr);
+
+ switch (br->br_perm) {
+ case AuBrPerm_RO:
+ case AuBrPerm_ROWH:
+ case AuBrPerm_RR:
+ case AuBrPerm_RRWH:
+ do_free = !!wbr;
+ skip = (!wbr
+ || (!wbr->wbr_whbase
+ && !wbr->wbr_plink
+ && !wbr->wbr_orph));
+ break;
+
+ case AuBrPerm_RWNoLinkWH:
+ /* skip = (!br->br_whbase && !br->br_orph); */
+ skip = (!wbr || !wbr->wbr_whbase);
+ if (skip && wbr) {
+ if (do_plink)
+ skip = !!wbr->wbr_plink;
+ else
+ skip = !wbr->wbr_plink;
+ }
+ break;
+
+ case AuBrPerm_RW:
+ /* skip = (br->br_whbase && br->br_ohph); */
+ skip = (wbr && wbr->wbr_whbase);
+ if (skip) {
+ if (do_plink)
+ skip = !!wbr->wbr_plink;
+ else
+ skip = !wbr->wbr_plink;
+ }
+ break;
+
+ default:
+ BUG();
+ }
+ if (wbr)
+ wbr_wh_read_unlock(wbr);
+
+ if (skip)
+ continue;
+
+ hdir = au_hi(dir, bindex);
+ au_hin_imtx_lock_nested(hdir, AuLsc_I_PARENT);
+ if (wbr)
+ wbr_wh_write_lock(wbr);
+ err = au_wh_init(au_h_dptr(root, bindex), br, sb);
+ if (wbr)
+ wbr_wh_write_unlock(wbr);
+ au_hin_imtx_unlock(hdir);
+
+ if (!err && do_free) {
+ kfree(wbr);
+ br->br_wbr = NULL;
+ }
+ }
+
+ return err;
+}
+
+int au_opts_mount(struct super_block *sb, struct au_opts *opts)
+{
+ int err;
+ unsigned int tmp;
+ aufs_bindex_t bend;
+ struct au_opt *opt;
+ struct au_opt_xino *opt_xino, xino;
+ struct au_sbinfo *sbinfo;
+
+ err = 0;
+ opt_xino = NULL;
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail)
+ err = au_opt_simple(sb, opt++, opts);
+ if (err > 0)
+ err = 0;
+ else if (unlikely(err < 0))
+ goto out;
+
+ /* disable xino and udba temporary */
+ sbinfo = au_sbi(sb);
+ tmp = sbinfo->si_mntflags;
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+ au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL);
+
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail)
+ err = au_opt_br(sb, opt++, opts);
+ if (err > 0)
+ err = 0;
+ else if (unlikely(err < 0))
+ goto out;
+
+ bend = au_sbend(sb);
+ if (unlikely(bend < 0)) {
+ err = -EINVAL;
+ AuErr("no branches\n");
+ goto out;
+ }
+
+ if (au_opt_test(tmp, XINO))
+ au_opt_set(sbinfo->si_mntflags, XINO);
+ opt = opts->opt;
+ while (!err && opt->type != Opt_tail)
+ err = au_opt_xino(sb, opt++, &opt_xino, opts);
+ if (unlikely(err))
+ goto out;
+
+ err = au_opts_verify(sb, sb->s_flags, tmp);
+ if (unlikely(err))
+ goto out;
+
+ /* restore xino */
+ if (au_opt_test(tmp, XINO) && !opt_xino) {
+ xino.file = au_xino_def(sb);
+ err = PTR_ERR(xino.file);
+ if (IS_ERR(xino.file))
+ goto out;
+
+ err = au_xino_set(sb, &xino, /*remount*/0);
+ fput(xino.file);
+ if (unlikely(err))
+ goto out;
+ }
+
+ /* restore udba */
+ sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+ sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA);
+ if (au_opt_test(tmp, UDBA_HINOTIFY)) {
+ struct inode *dir = sb->s_root->d_inode;
+ au_reset_hinotify(dir,
+ au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO);
+ }
+
+ out:
+ return err;
+}
+
+int au_opts_remount(struct super_block *sb, struct au_opts *opts)
+{
+ int err, rerr;
+ struct inode *dir;
+ struct au_opt_xino *opt_xino;
+ struct au_opt *opt;
+ struct au_sbinfo *sbinfo;
+
+ dir = sb->s_root->d_inode;
+ sbinfo = au_sbi(sb);
+ err = 0;
+ opt_xino = NULL;
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail) {
+ err = au_opt_simple(sb, opt, opts);
+ if (!err)
+ err = au_opt_br(sb, opt, opts);
+ if (!err)
+ err = au_opt_xino(sb, opt, &opt_xino, opts);
+ opt++;
+ }
+ if (err > 0)
+ err = 0;
+ AuTraceErr(err);
+ /* go on even err */
+
+ rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0);
+ if (unlikely(rerr && !err))
+ err = rerr;
+
+ if (au_ftest_opts(opts->flags, TRUNC_XIB)) {
+ rerr = au_xib_trunc(sb);
+ if (unlikely(rerr && !err))
+ err = rerr;
+ }
+
+ /* will be handled by the caller */
+ if (!au_ftest_opts(opts->flags, REFRESH_DIR)
+ && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO)))
+ au_fset_opts(opts->flags, REFRESH_DIR);
+
+ AuDbg("status 0x%x\n", opts->flags);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+unsigned int au_opt_udba(struct super_block *sb)
+{
+ return au_mntflags(sb) & AuOptMask_UDBA;
+}
diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h
new file mode 100644
index 0000000..89c3e3d
--- /dev/null
+++ b/fs/aufs/opts.h
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2005-2009 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * mount options/flags
+ */
+
+#ifndef __AUFS_OPTS_H__
+#define __AUFS_OPTS_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/aufs_type.h>
+
+/* ---------------------------------------------------------------------- */
+
+/* mount flags */
+#define AuOpt_XINO 1 /* external inode number bitmap
+ and translation table */
+#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */
+#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */
+#define AuOpt_UDBA_REVAL (1 << 3)
+#define AuOpt_UDBA_HINOTIFY (1 << 4)
+#define AuOpt_PLINK (1 << 5) /* pseudo-link */
+#define AuOpt_DIRPERM1 (1 << 6) /* unimplemented */
+#define AuOpt_REFROF (1 << 7) /* unimplemented */
+#define AuOpt_ALWAYS_DIROPQ (1 << 8) /* policy to creating diropq */
+#define AuOpt_SUM (1 << 9) /* summation for statfs(2) */
+#define AuOpt_SUM_W (1 << 10) /* unimplemented */
+#define AuOpt_WARN_PERM (1 << 11) /* warn when add-branch */
+#define AuOpt_VERBOSE (1 << 12) /* busy inode when del-branch */
+
+#ifndef CONFIG_AUFS_HINOTIFY
+#undef AuOpt_UDBA_HINOTIFY
+#define AuOpt_UDBA_HINOTIFY 0
+#endif
+
+#define AuOpt_Def (AuOpt_XINO \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_PLINK \
+ /* | AuOpt_DIRPERM1 */ \
+ | AuOpt_WARN_PERM)
+#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_UDBA_HINOTIFY)
+
+#define au_opt_test(flags, name) (flags & AuOpt_##name)
+#define au_opt_set(flags, name) do { \
+ BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
+ ((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_set_udba(flags, name) do { \
+ (flags) &= ~AuOptMask_UDBA; \
+ ((flags) |= AuOpt_##name); \
+} while (0)
+#define au_opt_clr(flags, name) { ((flags) &= ~AuOpt_##name); }
+
+/* ---------------------------------------------------------------------- */
+
+/* policies to select one among multiple writable branches */
+enum {
+ AuWbrCreate_TDP, /* top down parent */
+ AuWbrCreate_RR, /* round robin */
+ AuWbrCreate_MFS, /* most free space */
+ AuWbrCreate_MFSV, /* mfs with seconds */
+ AuWbrCreate_MFSRR, /* mfs then rr */
+ AuWbrCreate_MFSRRV, /* mfs then rr with seconds */
+ AuWbrCreate_PMFS, /* parent and mfs */
+ AuWbrCreate_PMFSV, /* parent and mfs with seconds */
+
+ AuWbrCreate_Def = AuWbrCreate_TDP
+};
+
+enum {
+ AuWbrCopyup_TDP, /* top down parent */
+ AuWbrCopyup_BUP, /* bottom up parent */
+ AuWbrCopyup_BU, /* bottom up */
+
+ AuWbrCopyup_Def = AuWbrCopyup_TDP
+};
+
+/* ---------------------------------------------------------------------- */
+
+struct au_opt_add {
+ aufs_bindex_t bindex;
+ char *pathname;
+ int perm;
+ struct path path;
+};
+
+struct au_opt_del {
+ char *pathname;
+ struct path h_path;
+};
+
+struct au_opt_mod {
+ char *path;
+ int perm;
+ struct dentry *h_root;
+};
+
+struct au_opt_xino {
+ char *path;
+ struct file *file;
+};
+
+struct au_opt_xino_itrunc {
+ aufs_bindex_t bindex;
+};
+
+struct au_opt_wbr_create {
+ int wbr_create;
+ int mfs_second;
+ unsigned long long mfsrr_watermark;
+};
+
+struct au_opt {
+ int type;
+ union {
+ struct au_opt_xino xino;
+ struct au_opt_xino_itrunc xino_itrunc;
+ struct au_opt_add add;
+ struct au_opt_del del;
+ struct au_opt_mod mod;
+ int dirwh;
+ int rdcache;
+ int deblk;
+ int nhash;
+ int udba;
+ struct au_opt_wbr_create wbr_create;
+ int wbr_copyup;
+ };
+};
+
+/* opts flags */
+#define AuOpts_REMOUNT 1
+#define AuOpts_REFRESH_DIR (1 << 1)
+#define AuOpts_REFRESH_NONDIR (1 << 2)
+#define AuOpts_TRUNC_XIB (1 << 3)
+#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name)
+#define au_fset_opts(flags, name) { (flags) |= AuOpts_##name; }
+#define au_fclr_opts(flags, name) { (flags) &= ~AuOpts_##name; }
+
+struct au_opts {
+ struct au_opt *opt;
+ int max_opt;
+
+ unsigned int given_udba;
+ unsigned int flags;
+ unsigned long sb_flags;
+};
+
+/* ---------------------------------------------------------------------- */
+
+const char *au_optstr_br_perm(int brperm);
+const char *au_optstr_udba(int udba);
+const char *au_optstr_wbr_copyup(int wbr_copyup);
+const char *au_optstr_wbr_create(int wbr_create);
+
+void au_opts_free(struct au_opts *opts);
+int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
+int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
+ unsigned int pending);
+int au_opts_mount(struct super_block *sb, struct au_opts *opts);
+int au_opts_remount(struct super_block *sb, struct au_opts *opts);
+
+unsigned int au_opt_udba(struct super_block *sb);
+
+/* ---------------------------------------------------------------------- */
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_OPTS_H__ */
--
1.6.1.284.g5dc13