[AUFS PATCH v2.6.26-rc2-mm1 10/39] aufs mount options/flags
From: hooanon05
Date: Tue May 20 2008 - 23:40:51 EST
From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
handling mount options/flags
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/opts.c | 1492 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/opts.h | 243 +++++++++
2 files changed, 1735 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..ca897a8
--- /dev/null
+++ b/fs/aufs/opts.c
@@ -0,0 +1,1492 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * 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_xinodir, Opt_xinonames, Opt_ixinonames,
+ Opt_trunc_xib, Opt_notrunc_xib,
+ Opt_dirperm1, Opt_nodirperm1,
+ Opt_shwh, Opt_noshwh,
+ Opt_plink, Opt_noplink, Opt_list_plink, Opt_clean_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_coo,
+ Opt_dlgt, Opt_nodlgt,
+ Opt_refrof, Opt_norefrof,
+ Opt_verbose, Opt_noverbose,
+ 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_dirwh, "dirwh:%d"},
+
+ {Opt_xino, "xino=%s"},
+ {Opt_xino, "xino:%s"},
+ {Opt_xinodir, "xinodir=%s"},
+ {Opt_xinodir, "xinodir:%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_trunc_xino_path, "trunc_xino:%s"},
+ {Opt_itrunc_xino, "itrunc_xino=%d"},
+ {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_clean_plink, "clean_plink"},
+
+ {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"},
+
+#ifdef CONFIG_AUFS_DLGT
+ {Opt_dlgt, "dlgt"},
+ {Opt_nodlgt, "nodlgt"},
+
+ {Opt_dirperm1, "dirperm1"},
+ {Opt_nodirperm1, "nodirperm1"},
+#endif
+
+#ifdef CONFIG_AUFS_SHWH
+ {Opt_shwh, "shwh"},
+ {Opt_noshwh, "noshwh"},
+#endif
+
+ {Opt_rendir, "rendir=%d"},
+ {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_rdcache, "rdcache=%d"},
+ {Opt_rdcache, "rdcache:%d"},
+
+ {Opt_coo, "coo=%s"},
+
+ {Opt_wbr_create, "create=%s"},
+ {Opt_wbr_create, "create:%s"},
+ {Opt_wbr_create, "create_policy=%s"},
+ {Opt_wbr_create, "create_policy:%s"},
+ {Opt_wbr_copyup, "cpup=%s"},
+ {Opt_wbr_copyup, "cpup:%s"},
+ {Opt_wbr_copyup, "copyup=%s"},
+ {Opt_wbr_copyup, "copyup:%s"},
+ {Opt_wbr_copyup, "copyup_policy=%s"},
+ {Opt_wbr_copyup, "copyup_policy:%s"},
+
+ /* internal use for the scripts */
+ {Opt_ignore_silent, "si=%s"},
+
+#if 0 /* reserved for future use */
+ {Opt_deblk, "deblk=%d"},
+ {Opt_deblk, "deblk:%d"},
+ {Opt_nhash, "nhash=%d"},
+ {Opt_nhash, "nhash:%d"},
+#endif
+
+ {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 "??";
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define RW "rw"
+#define RO "ro"
+#define WH "wh"
+#define RR "rr"
+#define NoLinkWH "nolwh"
+
+static match_table_t brperms = {
+ {AuBr_RR, RR},
+ {AuBr_RO, RO},
+ {AuBr_RW, RW},
+
+ {AuBr_RRWH, RR "+" WH},
+ {AuBr_ROWH, RO "+" WH},
+ {AuBr_RWNoLinkWH, RW "+" NoLinkWH},
+
+ {AuBr_ROWH, "nfsro"},
+ {AuBr_RO, NULL}
+};
+
+static noinline_for_stack int br_perm_val(char *perm)
+{
+ int val;
+ substring_t args[MAX_OPT_ARGS];
+
+ AuDebugOn(!perm || !*perm);
+ LKTRTrace("perm %s\n", perm);
+ val = match_token(perm, brperms, args);
+ AuTraceErr(val);
+ return val;
+}
+
+const char *au_optstr_br_perm(int brperm)
+{
+ return au_parser_pattern(brperm, brperms);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t udbalevel = {
+ {AuOpt_UDBA_REVAL, "reval"},
+#ifdef CONFIG_AUFS_HINOTIFY
+ {AuOpt_UDBA_INOTIFY, "inotify"},
+#endif
+ {AuOpt_UDBA_NONE, "none"},
+ {-1, NULL}
+};
+
+static noinline_for_stack 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, udbalevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static match_table_t coolevel = {
+ {AuOpt_COO_NONE, "none"},
+ {AuOpt_COO_LEAF, "leaf"},
+ {AuOpt_COO_ALL, "all"},
+ {-1, NULL}
+};
+
+static noinline_for_stack int coo_val(char *str)
+{
+ substring_t args[MAX_OPT_ARGS];
+ return match_token(str, coolevel, args);
+}
+
+const char *au_optstr_coo(int coo)
+{
+ return au_parser_pattern(coo, coolevel);
+}
+
+/* ---------------------------------------------------------------------- */
+
+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 base)
+{
+ char *endp;
+ char *buf;
+ int ret;
+
+ buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+ memcpy(buf, s->from, s->to - s->from);
+ buf[s->to - s->from] = '\0';
+ *result = simple_strtoull(buf, &endp, base);
+ ret = 0;
+ if (endp == buf)
+ ret = -EINVAL;
+ kfree(buf);
+ return ret;
+}
+
+static int au_wbr_mfs_wmark(substring_t *arg, char *str,
+ struct au_opt_wbr_create *create)
+{
+ int err;
+ u64 ull;
+
+ err = 0;
+ if (!au_match_ull(arg, &ull, 0))
+ create->mfsrr_watermark = ull;
+ else {
+ AuErr("bad integer in %s\n", str);
+ err = -EINVAL;
+ }
+
+ AuTraceErr(err);
+ 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;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+static noinline_for_stack 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, 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 noinline_for_stack 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, au_wbr_copyup_policy);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
+
+static noinline_for_stack 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;
+
+ AuTraceEnter();
+
+ opt = opts->opt;
+ while (/* opt < opts_tail && */ opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ u.add = &opt->add;
+ LKTRTrace("add {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->path, u.add->perm,
+ u.add->nd.path.dentry);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ u.del = &opt->del;
+ LKTRTrace("del {%s, %p}\n", u.del->path, u.del->h_root);
+ break;
+ case Opt_mod:
+ case Opt_imod:
+ u.mod = &opt->mod;
+ LKTRTrace("mod {%s, 0x%x, %p}\n",
+ u.mod->path, u.mod->perm, u.mod->h_root);
+ break;
+ case Opt_append:
+ u.add = &opt->add;
+ LKTRTrace("append {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->path, u.add->perm,
+ u.add->nd.path.dentry);
+ break;
+ case Opt_prepend:
+ u.add = &opt->add;
+ LKTRTrace("prepend {b%d, %s, 0x%x, %p}\n",
+ u.add->bindex, u.add->path, u.add->perm,
+ u.add->nd.path.dentry);
+ break;
+ case Opt_dirwh:
+ LKTRTrace("dirwh %d\n", opt->dirwh);
+ break;
+ case Opt_rdcache:
+ LKTRTrace("rdcache %d\n", opt->rdcache);
+ break;
+ case Opt_xino:
+ u.xino = &opt->xino;
+ LKTRTrace("xino {%s %.*s}\n",
+ u.xino->path,
+ AuDLNPair(u.xino->file->f_dentry));
+ break;
+ case Opt_trunc_xino:
+ LKTRLabel(trunc_xino);
+ break;
+ case Opt_notrunc_xino:
+ LKTRLabel(notrunc_xino);
+ break;
+ case Opt_trunc_xino_path:
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ LKTRTrace("trunc_xino %d\n", u.xino_itrunc->bindex);
+ break;
+
+ case Opt_noxino:
+ LKTRLabel(noxino);
+ break;
+ case Opt_trunc_xib:
+ LKTRLabel(trunc_xib);
+ break;
+ case Opt_notrunc_xib:
+ LKTRLabel(notrunc_xib);
+ break;
+ case Opt_dirperm1:
+ LKTRLabel(dirperm1);
+ break;
+ case Opt_nodirperm1:
+ LKTRLabel(nodirperm1);
+ break;
+ case Opt_shwh:
+ LKTRLabel(shwh);
+ break;
+ case Opt_noshwh:
+ LKTRLabel(noshwh);
+ break;
+ case Opt_plink:
+ LKTRLabel(plink);
+ break;
+ case Opt_noplink:
+ LKTRLabel(noplink);
+ break;
+ case Opt_list_plink:
+ LKTRLabel(list_plink);
+ break;
+ case Opt_clean_plink:
+ LKTRLabel(clean_plink);
+ break;
+ case Opt_udba:
+ LKTRTrace("udba %d, %s\n",
+ opt->udba, au_optstr_udba(opt->udba));
+ break;
+ case Opt_diropq_a:
+ LKTRLabel(diropq_a);
+ break;
+ case Opt_diropq_w:
+ LKTRLabel(diropq_w);
+ break;
+ case Opt_warn_perm:
+ LKTRLabel(warn_perm);
+ break;
+ case Opt_nowarn_perm:
+ LKTRLabel(nowarn_perm);
+ break;
+ case Opt_dlgt:
+ LKTRLabel(dlgt);
+ break;
+ case Opt_nodlgt:
+ LKTRLabel(nodlgt);
+ break;
+ case Opt_refrof:
+ LKTRLabel(refrof);
+ break;
+ case Opt_norefrof:
+ LKTRLabel(norefrof);
+ break;
+ case Opt_verbose:
+ LKTRLabel(verbose);
+ break;
+ case Opt_noverbose:
+ LKTRLabel(noverbose);
+ break;
+ case Opt_coo:
+ LKTRTrace("coo %d, %s\n",
+ opt->coo, au_optstr_coo(opt->coo));
+ break;
+ case Opt_wbr_create:
+ u.create = &opt->wbr_create;
+ LKTRTrace("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:
+ LKTRTrace("%d sec\n", u.create->mfs_second);
+ break;
+ case AuWbrCreate_MFSRR:
+ LKTRTrace("%Lu watermark\n",
+ u.create->mfsrr_watermark);
+ break;
+ case AuWbrCreate_MFSRRV:
+ LKTRTrace("%Lu watermark, %d sec\n",
+ u.create->mfsrr_watermark,
+ u.create->mfs_second);
+ break;
+ }
+ break;
+ case Opt_wbr_copyup:
+ LKTRTrace("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;
+
+ AuTraceEnter();
+
+ opt = opts->opt;
+ while (opt->type != Opt_tail) {
+ switch (opt->type) {
+ case Opt_add:
+ case Opt_append:
+ case Opt_prepend:
+ path_put(&opt->add.nd.path);
+ break;
+ case Opt_del:
+ case Opt_idel:
+ dput(opt->del.h_root);
+ 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, struct super_block *sb,
+ aufs_bindex_t bindex)
+{
+ int err;
+ struct au_opt_add *add = &opt->add;
+ char *p;
+
+ LKTRTrace("%s, b%d\n", opt_str, bindex);
+
+ add->bindex = bindex;
+ add->perm = AuBr_Last;
+ add->path = opt_str;
+ p = strchr(opt_str, '=');
+ if (unlikely(p)) {
+ *p++ = 0;
+ if (*p)
+ add->perm = br_perm_val(p);
+ }
+
+ /* LSM may detect it */
+ /* do not superio. */
+ err = vfsub_path_lookup(add->path, lkup_dirflags, &add->nd);
+ if (!err) {
+ if (!p /* && add->perm == AuBr_Last */) {
+ add->perm = AuBr_RO;
+ if (au_test_def_rr(add->nd.path.dentry->d_sb))
+ add->perm = AuBr_RR;
+ if (!bindex && !(sb->s_flags & MS_RDONLY))
+ add->perm = AuBr_RW;
+#ifdef CONFIG_AUFS_COMPAT
+ add->perm = AuBr_RW;
+#endif
+ }
+ opt->type = Opt_add;
+ goto out;
+ }
+ AuErr("lookup failed %s (%d)\n", add->path, err);
+ err = -EINVAL;
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* called without aufs lock */
+int au_opts_parse(struct super_block *sb, unsigned long flags, char *str,
+ struct au_opts *opts)
+{
+ int err, n, token, skipped;
+ struct dentry *root;
+ struct au_opt *opt, *opt_tail;
+ char *opt_str, *p;
+ substring_t args[MAX_OPT_ARGS];
+ aufs_bindex_t bindex, bend;
+ struct nameidata nd;
+ union {
+ 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 file *file;
+
+ LKTRTrace("%s, nopts %d\n", str, opts->max_opt);
+
+ 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;
+ token = match_token(opt_str, options, args);
+ LKTRTrace("%s, token %d, args[0]{%p, %p}\n",
+ opt_str, token, args[0].from, args[0].to);
+
+ skipped = 0;
+ switch (token) {
+ case Opt_br:
+ err = 0;
+ while (!err && (opt_str = strsep(&args[0].from, ":"))
+ && *opt_str) {
+ err = opt_add(opt, opt_str, sb, bindex++);
+ if (unlikely(!err && ++opt > opt_tail)) {
+ err = -E2BIG;
+ break;
+ }
+ opt->type = Opt_tail;
+ skipped = 1;
+ }
+ break;
+ case Opt_add:
+ if (unlikely(match_int(&args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ bindex = n;
+ err = opt_add(opt, args[1].from, sb, bindex);
+ break;
+ case Opt_append:
+ err = opt_add(opt, args[0].from, sb, /*dummy bindex*/1);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_prepend:
+ err = opt_add(opt, args[0].from, sb, /*bindex*/0);
+ if (!err)
+ opt->type = token;
+ break;
+ case Opt_del:
+ u.del = &opt->del;
+ u.del->path = args[0].from;
+ LKTRTrace("del path %s\n", u.del->path);
+ /* LSM may detect it */
+ /* do not superio. */
+ err = vfsub_path_lookup(u.del->path, lkup_dirflags,
+ &nd);
+ if (unlikely(err)) {
+ AuErr("lookup failed %s (%d)\n",
+ u.del->path, err);
+ break;
+ }
+ u.del->h_root = dget(nd.path.dentry);
+ path_put(&nd.path);
+ opt->type = token;
+ break;
+#if 0 /* reserved for future use */
+ case Opt_idel:
+ u.del = &opt->del;
+ u.del->path = "(indexed)";
+ if (unlikely(match_int(&args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ bindex = n;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ AuErr("out of bounds, %d\n", bindex);
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+ }
+ err = 0;
+ u.del->h_root = dget(au_h_dptr(root, bindex));
+ opt->type = token;
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+#endif
+ case Opt_mod:
+ u.mod = &opt->mod;
+ u.mod->path = args[0].from;
+ p = strchr(u.mod->path, '=');
+ if (unlikely(!p)) {
+ AuErr("no permssion %s\n", opt_str);
+ break;
+ }
+ *p++ = 0;
+ u.mod->perm = br_perm_val(p);
+ LKTRTrace("mod path %s, perm 0x%x, %s\n",
+ u.mod->path, u.mod->perm, p);
+ /* LSM may detect it */
+ /* do not superio. */
+ err = vfsub_path_lookup(u.mod->path, lkup_dirflags,
+ &nd);
+ if (unlikely(err)) {
+ AuErr("lookup failed %s (%d)\n",
+ u.mod->path, err);
+ break;
+ }
+ u.mod->h_root = dget(nd.path.dentry);
+ path_put(&nd.path);
+ opt->type = token;
+ break;
+#ifdef IMOD /* reserved for future use */
+ case Opt_imod:
+ u.mod = &opt->mod;
+ u.mod->path = "(indexed)";
+ if (unlikely(match_int(&args[0], &n))) {
+ AuErr("bad integer in %s\n", opt_str);
+ break;
+ }
+ bindex = n;
+ aufs_read_lock(root, AuLock_FLUSH);
+ if (bindex < 0 || au_sbend(sb) < bindex) {
+ AuErr("out of bounds, %d\n", bindex);
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+ }
+ u.mod->perm = br_perm_val(args[1].from);
+ LKTRTrace("mod path %s, perm 0x%x, %s\n",
+ u.mod->path, u.mod->perm, args[1].from);
+ err = 0;
+ u.mod->h_root = dget(au_h_dptr(root, bindex));
+ opt->type = token;
+ aufs_read_unlock(root, !AuLock_IR);
+ break;
+#endif
+ case Opt_xino:
+ u.xino = &opt->xino;
+ file = au_xino_create(sb, args[0].from, /*silent*/0,
+ /*parent*/NULL);
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
+ break;
+ err = -EINVAL;
+ if (unlikely(file->f_dentry->d_sb == sb)) {
+ fput(file);
+ AuErr("%s must be outside\n", args[0].from);
+ break;
+ }
+ err = 0;
+ u.xino->file = file;
+ u.xino->path = args[0].from;
+ opt->type = token;
+ break;
+
+ case Opt_trunc_xino_path:
+ u.xino_itrunc = &opt->xino_itrunc;
+ p = args[0].from;
+ LKTRTrace("trunc_xino path %s\n", p);
+ /* LSM may detect it */
+ /* do not superio. */
+ err = vfsub_path_lookup(p, lkup_dirflags, &nd);
+ if (unlikely(err)) {
+ AuErr("lookup failed %s (%d)\n", p , err);
+ break;
+ }
+ u.xino_itrunc->bindex = -1;
+ aufs_read_lock(root, AuLock_FLUSH);
+ bend = au_sbend(sb);
+ for (bindex = 0; bindex <= bend; bindex++) {
+ if (au_h_dptr(root, bindex) == nd.path.dentry) {
+ u.xino_itrunc->bindex = bindex;
+ break;
+ }
+ }
+ aufs_read_unlock(root, !AuLock_IR);
+ path_put(&nd.path);
+ if (unlikely(u.xino_itrunc->bindex < 0)) {
+ AuErr("no such branch %s\n", p);
+ err = -EINVAL;
+ break;
+ }
+ opt->type = token;
+ break;
+
+ case Opt_itrunc_xino:
+ u.xino_itrunc = &opt->xino_itrunc;
+ if (unlikely(match_int(&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(&args[0], &opt->dirwh)))
+ break;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_rdcache:
+ if (unlikely(match_int(&args[0], &opt->rdcache)))
+ break;
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_shwh:
+ if (flags & MS_RDONLY) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("shwh requires ro\n");
+ break;
+
+ case Opt_trunc_xino:
+ case Opt_notrunc_xino:
+ case Opt_noxino:
+ case Opt_trunc_xib:
+ case Opt_notrunc_xib:
+ case Opt_dirperm1:
+ case Opt_nodirperm1:
+ case Opt_noshwh:
+ case Opt_plink:
+ case Opt_noplink:
+ case Opt_list_plink:
+ case Opt_clean_plink:
+ case Opt_diropq_a:
+ case Opt_diropq_w:
+ case Opt_warn_perm:
+ case Opt_nowarn_perm:
+ case Opt_dlgt:
+ case Opt_nodlgt:
+ case Opt_refrof:
+ case Opt_norefrof:
+ case Opt_verbose:
+ case Opt_noverbose:
+ err = 0;
+ opt->type = token;
+ break;
+
+ case Opt_udba:
+ opt->udba = udba_val(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(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(args[0].from);
+ if (opt->wbr_copyup >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_coo:
+ opt->coo = coo_val(args[0].from);
+ if (opt->coo >= 0) {
+ err = 0;
+ opt->type = token;
+ } else
+ AuErr("wrong value, %s\n", opt_str);
+ break;
+
+ case Opt_ignore:
+#ifndef CONFIG_AUFS_COMPAT
+ AuWarn("ignored %s\n", opt_str);
+#endif
+ 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;
+ }
+ }
+
+ dump_opts(opts);
+ if (unlikely(err))
+ au_opts_free(opts);
+ AuTraceErr(err);
+ 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;
+ struct au_opt_wbr_create *create;
+
+ AuTraceEnter();
+
+ 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_clean_plink:
+ if (au_opt_test(sbinfo->si_mntflags, PLINK))
+ au_plink_put(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_dlgt:
+ au_opt_set(sbinfo->si_mntflags, DLGT);
+ break;
+ case Opt_nodlgt:
+ au_opt_clr(sbinfo->si_mntflags, DLGT);
+ 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_set(sbinfo->si_mntflags, COO_LEAF); */
+ 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_wbr_create:
+ create = &opt->wbr_create;
+ 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 */
+ 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_coo:
+ sbinfo->si_mntflags &= ~AuOptMask_COO;
+ sbinfo->si_mntflags |= opt->coo;
+ 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_dirperm1:
+ au_opt_set(sbinfo->si_mntflags, DIRPERM1);
+ break;
+ case Opt_nodirperm1:
+ au_opt_clr(sbinfo->si_mntflags, DIRPERM1);
+ break;
+
+ case Opt_shwh:
+ au_opt_set(sbinfo->si_mntflags, SHWH);
+ break;
+ case Opt_noshwh:
+ au_opt_clr(sbinfo->si_mntflags, SHWH);
+ 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;
+ }
+
+ AuTraceErr(err);
+ 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;
+
+ AuTraceEnter();
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_append:
+ opt->add.bindex = au_sbend(sb) + 1;
+ if (unlikely(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 (unlikely(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 (unlikely(do_refresh)) {
+ au_fset_opts(opts->flags, REFRESH_DIR);
+ au_fset_opts(opts->flags, REFRESH_NONDIR);
+ }
+ }
+ break;
+ }
+
+ AuTraceErr(err);
+ 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;
+
+ AuTraceEnter();
+
+ err = 0;
+ switch (opt->type) {
+ case Opt_xino:
+ err = au_xino_set(sb, &opt->xino,
+ au_ftest_opts(opts->flags, REMOUNT));
+ if (!err)
+ *opt_xino = &opt->xino;
+ break;
+ case Opt_noxino:
+ au_xino_clr(sb);
+ *opt_xino = (void *)-1;
+ break;
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+static noinline_for_stack int
+verify_opts(struct super_block *sb, unsigned int pending, int remount)
+{
+ int err;
+ aufs_bindex_t bindex, bend;
+ struct au_branch *br;
+ struct dentry *root;
+ struct inode *dir;
+ unsigned int do_plink;
+ unsigned int mnt_flags;
+
+ AuTraceEnter();
+ mnt_flags = au_mntflags(sb);
+ AuDebugOn(!(mnt_flags & AuOptMask_COO));
+ AuDebugOn(!(mnt_flags & AuOptMask_UDBA));
+
+ if (!(sb->s_flags & MS_RDONLY)) {
+ if (unlikely(!au_br_writable(au_sbr_perm(sb, 0))))
+ AuWarn("first branch should be rw\n");
+ if (unlikely(au_opt_test(mnt_flags, SHWH)))
+ AuWarn("shwh should be used with ro\n");
+ }
+
+ if (unlikely(au_opt_test(mnt_flags | pending, UDBA_INOTIFY)
+ && !au_opt_test(mnt_flags, XINO)))
+ AuWarn("udba=inotify requires xino\n");
+
+ err = 0;
+ root = sb->s_root;
+ dir = sb->s_root->d_inode;
+ do_plink = !!au_opt_test(mnt_flags, PLINK);
+ bend = au_sbend(sb);
+ for (bindex = 0; !err && bindex <= bend; bindex++) {
+ struct inode *h_dir;
+ int skip;
+
+ skip = 0;
+ h_dir = au_h_iptr(dir, bindex);
+ br = au_sbr(sb, bindex);
+ br_wh_read_lock(br);
+ switch (br->br_perm) {
+ case AuBr_RR:
+ case AuBr_RO:
+ case AuBr_RRWH:
+ case AuBr_ROWH:
+ skip = (!br->br_wh && !br->br_plink);
+ break;
+
+ case AuBr_RWNoLinkWH:
+ skip = !br->br_wh;
+ if (skip) {
+ if (do_plink)
+ skip = !!br->br_plink;
+ else
+ skip = !br->br_plink;
+ }
+ break;
+
+ case AuBr_RW:
+ skip = !!br->br_wh;
+ if (skip) {
+ if (do_plink)
+ skip = !!br->br_plink;
+ else
+ skip = !br->br_plink;
+ }
+ break;
+
+ default:
+ BUG();
+ }
+ br_wh_read_unlock(br);
+
+ if (skip)
+ continue;
+
+ au_hdir_lock(h_dir, dir, bindex);
+ br_wh_write_lock(br);
+ err = au_wh_init(au_h_dptr(root, bindex), br,
+ au_nfsmnt(sb, bindex), sb);
+ br_wh_write_unlock(br);
+ au_hdir_unlock(h_dir, dir, bindex);
+ }
+
+ AuTraceErr(err);
+ return err;
+}
+
+int au_opts_mount(struct super_block *sb, struct au_opts *opts)
+{
+ int err;
+ struct inode *dir;
+ struct au_opt *opt;
+ struct au_opt_xino *opt_xino;
+ aufs_bindex_t bend;
+ struct au_sbinfo *sbinfo;
+ unsigned int tmp;
+
+ AuTraceEnter();
+ SiMustWriteLock(sb);
+ DiMustWriteLock(sb->s_root);
+ dir = sb->s_root->d_inode;
+ IiMustWriteLock(dir);
+
+ 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, hinotify, dlgt temporary */
+ sbinfo = au_sbi(sb);
+ tmp = sbinfo->si_mntflags;
+ au_opt_clr(sbinfo->si_mntflags, XINO);
+ au_opt_clr(sbinfo->si_mntflags, DLGT);
+ 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;
+
+ /* todo: test this error case? */
+ err = verify_opts(sb, tmp, /*remount*/0);
+ if (unlikely(err))
+ goto out;
+
+ /* enable xino */
+ if (au_opt_test(tmp, XINO) && !opt_xino) {
+ struct au_opt_xino 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 hinotify */
+ sbinfo->si_mntflags &= ~AuOptMask_UDBA;
+ sbinfo->si_mntflags |= (tmp & AuOptMask_UDBA);
+ if (au_opt_test(tmp, UDBA_INOTIFY))
+ au_reset_hinotify(dir, au_hi_flags(dir, 1) & ~AuHi_XINO);
+
+ /* restore dlgt */
+ if (au_opt_test_dlgt(tmp))
+ au_opt_set(sbinfo->si_mntflags, DLGT);
+
+ out:
+ AuTraceErr(err);
+ 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;
+ unsigned int dlgt;
+ struct au_sbinfo *sbinfo;
+
+ AuTraceEnter();
+ SiMustWriteLock(sb);
+ DiMustWriteLock(sb->s_root);
+ dir = sb->s_root->d_inode;
+ IiMustWriteLock(dir);
+ sbinfo = au_sbi(sb);
+
+ err = 0;
+ dlgt = !!au_opt_test_dlgt(sbinfo->si_mntflags);
+ opt_xino = NULL;
+ opt = opts->opt;
+ while (err >= 0 && opt->type != Opt_tail) {
+ err = au_opt_simple(sb, opt, opts);
+
+ /* disable it temporary */
+ dlgt = !!au_opt_test_dlgt(sbinfo->si_mntflags);
+ au_opt_clr(sbinfo->si_mntflags, DLGT);
+
+ if (!err)
+ err = au_opt_br(sb, opt, opts);
+ if (!err)
+ err = au_opt_xino(sb, opt, &opt_xino, opts);
+
+ /* restore it */
+ if (unlikely(dlgt))
+ au_opt_set(sbinfo->si_mntflags, DLGT);
+ opt++;
+ }
+ if (err > 0)
+ err = 0;
+ AuTraceErr(err);
+
+ /* go on even err */
+
+ /* todo: test this error case? */
+ au_opt_clr(sbinfo->si_mntflags, DLGT);
+ rerr = verify_opts(sb, sbinfo->si_mntflags, /*remount*/1);
+ if (unlikely(dlgt))
+ au_opt_set(sbinfo->si_mntflags, DLGT);
+ if (unlikely(rerr && !err))
+ err = rerr;
+
+ if (unlikely(au_ftest_opts(opts->flags, TRUNC_XIB))) {
+ rerr = au_xib_trunc(sb);
+ if (unlikely(rerr && !err))
+ err = rerr;
+ }
+
+ /* they are 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);
+
+ LKTRTrace("status 0x%x\n", opts->flags);
+ AuTraceErr(err);
+ return err;
+}
diff --git a/fs/aufs/opts.h b/fs/aufs/opts.h
new file mode 100644
index 0000000..2bb8a95
--- /dev/null
+++ b/fs/aufs/opts.h
@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * 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>
+#include "wkq.h"
+
+/* ---------------------------------------------------------------------- */
+/* mount flags */
+
+/* external inode number bitmap and translation table */
+#define AuOpt_XINO 1
+#define AuOpt_TRUNC_XINO (1 << 1)
+#define AuOpt_LINO (1 << 2)
+#define AuOpt_UDBA_NONE (1 << 3) /* users direct branch access */
+#define AuOpt_UDBA_REVAL (1 << 4)
+#define AuOpt_UDBA_INOTIFY (1 << 5)
+#define AuOpt_SHWH (1 << 6)
+#define AuOpt_PLINK (1 << 7)
+#define AuOpt_WARN_PERM (1 << 8)
+#define AuOpt_DIRPERM1 (1 << 9)
+#define AuOpt_DLGT (1 << 10)
+#define AuOpt_COO_NONE (1 << 11) /* copyup on open */
+#define AuOpt_COO_LEAF (1 << 12)
+#define AuOpt_COO_ALL (1 << 13)
+#define AuOpt_ALWAYS_DIROPQ (1 << 14)
+#define AuOpt_REFROF (1 << 15)
+#define AuOpt_VERBOSE (1 << 16)
+#ifndef CONFIG_AUFS_HINOTIFY
+#undef AuOpt_UDBA_INOTIFY
+#define AuOpt_UDBA_INOTIFY 0
+#endif
+#ifndef CONFIG_AUFS_SHWH
+#undef AuOpt_SHWH
+#define AuOpt_SHWH 0
+#endif
+#ifndef CONFIG_AUFS_DLGT
+#undef AuOpt_DIRPERM1
+#define AuOpt_DIRPERM1 0
+#undef AuOpt_DLGT
+#define AuOpt_DLGT 0
+#endif
+
+/* 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
+};
+
+#define AuOptMask_COO (AuOpt_COO_NONE \
+ | AuOpt_COO_LEAF \
+ | AuOpt_COO_ALL)
+#define AuOptMask_UDBA (AuOpt_UDBA_NONE \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_UDBA_INOTIFY)
+
+#ifdef CONFIG_AUFS_COMPAT
+#define AuOpt_DefExtra1 AuOpt_ALWAYS_DIROPQ
+#else
+#define AuOpt_DefExtra1 0
+#endif
+
+#define AuOpt_Def (AuOpt_XINO \
+ | AuOpt_UDBA_REVAL \
+ | AuOpt_WARN_PERM \
+ | AuOpt_COO_NONE \
+ | AuOpt_PLINK \
+ | AuOpt_DefExtra1)
+
+/* ---------------------------------------------------------------------- */
+
+struct au_opt_add {
+ aufs_bindex_t bindex;
+ char *path;
+ int perm;
+ struct nameidata nd;
+};
+
+struct au_opt_del {
+ char *path;
+ struct dentry *h_root;
+};
+
+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_xino_trunc_v {
+ u64 upper;
+ int step;
+};
+
+struct au_opt_wbr_create {
+ int wbr_create;
+ int mfs_second;
+ u64 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;
+ int coo;
+ 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;
+};
+
+/* ---------------------------------------------------------------------- */
+
+const char *au_optstr_br_perm(int brperm);
+const char *au_optstr_udba(int udba);
+const char *au_optstr_coo(int coo);
+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, unsigned long flags, char *str,
+ struct au_opts *opts);
+int au_opts_mount(struct super_block *sb, struct au_opts *opts);
+int au_opts_remount(struct super_block *sb, struct au_opts *opts);
+
+/* ---------------------------------------------------------------------- */
+
+static inline unsigned int au_opt_do_test(unsigned int flags, unsigned int bit)
+{
+ AuDebugOn(bit & (AuOpt_DLGT | AuOpt_DIRPERM1));
+ return (flags & bit);
+}
+
+#define au_opt_test(flags, name) au_opt_do_test(flags, AuOpt_##name)
+
+#define au_opt_set(flags, name) do { \
+ BUILD_BUG_ON(AuOpt_##name & (AuOptMask_COO | AuOptMask_UDBA)); \
+ ((flags) |= AuOpt_##name); \
+} while (0)
+
+#define au_opt_clr(flags, name) { ((flags) &= ~AuOpt_##name); }
+
+#define au_opt_set_coo(flags, name) do { \
+ (flags) &= ~AuOptMask_COO; \
+ ((flags) |= AuOpt_##name); \
+} while(0)
+
+#define au_opt_set_udba(flags, name) do { \
+ (flags) &= ~AuOptMask_UDBA; \
+ ((flags) |= AuOpt_##name); \
+} while(0)
+
+static inline unsigned int au_opt_test_dlgt(unsigned int flags)
+{
+ if (!au_test_wkq(current))
+ return (flags & AuOpt_DLGT);
+ return 0;
+}
+
+static inline unsigned int au_opt_test_dirperm1(unsigned int flags)
+{
+ if (!au_test_wkq(current))
+ return (flags & AuOpt_DIRPERM1);
+ return 0;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_OPTS_H__ */
--
1.5.5.1.308.g1fbb5.dirty
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