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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /fs/aufs/dcsub.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'fs/aufs/dcsub.c')
-rw-r--r--fs/aufs/dcsub.c224
1 files changed, 0 insertions, 224 deletions
diff --git a/fs/aufs/dcsub.c b/fs/aufs/dcsub.c
deleted file mode 100644
index 910a2e870..000000000
--- a/fs/aufs/dcsub.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * Copyright (C) 2005-2015 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.
- *
- * 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, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for dentry cache
- */
-
-#include "aufs.h"
-
-static void au_dpage_free(struct au_dpage *dpage)
-{
- int i;
- struct dentry **p;
-
- p = dpage->dentries;
- for (i = 0; i < dpage->ndentry; i++)
- dput(*p++);
- free_page((unsigned long)dpage->dentries);
-}
-
-int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp)
-{
- int err;
- void *p;
-
- err = -ENOMEM;
- dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp);
- if (unlikely(!dpages->dpages))
- goto out;
-
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out_dpages;
-
- dpages->dpages[0].ndentry = 0;
- dpages->dpages[0].dentries = p;
- dpages->ndpage = 1;
- return 0; /* success */
-
-out_dpages:
- kfree(dpages->dpages);
-out:
- return err;
-}
-
-void au_dpages_free(struct au_dcsub_pages *dpages)
-{
- int i;
- struct au_dpage *p;
-
- p = dpages->dpages;
- for (i = 0; i < dpages->ndpage; i++)
- au_dpage_free(p++);
- kfree(dpages->dpages);
-}
-
-static int au_dpages_append(struct au_dcsub_pages *dpages,
- struct dentry *dentry, gfp_t gfp)
-{
- int err, sz;
- struct au_dpage *dpage;
- void *p;
-
- dpage = dpages->dpages + dpages->ndpage - 1;
- sz = PAGE_SIZE / sizeof(dentry);
- if (unlikely(dpage->ndentry >= sz)) {
- AuLabel(new dpage);
- err = -ENOMEM;
- sz = dpages->ndpage * sizeof(*dpages->dpages);
- p = au_kzrealloc(dpages->dpages, sz,
- sz + sizeof(*dpages->dpages), gfp);
- if (unlikely(!p))
- goto out;
-
- dpages->dpages = p;
- dpage = dpages->dpages + dpages->ndpage;
- p = (void *)__get_free_page(gfp);
- if (unlikely(!p))
- goto out;
-
- dpage->ndentry = 0;
- dpage->dentries = p;
- dpages->ndpage++;
- }
-
- AuDebugOn(au_dcount(dentry) <= 0);
- dpage->dentries[dpage->ndentry++] = dget_dlock(dentry);
- return 0; /* success */
-
-out:
- return err;
-}
-
-/* todo: BAD approach */
-/* copied from linux/fs/dcache.c */
-enum d_walk_ret {
- D_WALK_CONTINUE,
- D_WALK_QUIT,
- D_WALK_NORETRY,
- D_WALK_SKIP,
-};
-
-extern void d_walk(struct dentry *parent, void *data,
- enum d_walk_ret (*enter)(void *, struct dentry *),
- void (*finish)(void *));
-
-struct ac_dpages_arg {
- int err;
- struct au_dcsub_pages *dpages;
- struct super_block *sb;
- au_dpages_test test;
- void *arg;
-};
-
-static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry)
-{
- enum d_walk_ret ret;
- struct ac_dpages_arg *arg = _arg;
-
- ret = D_WALK_CONTINUE;
- if (dentry->d_sb == arg->sb
- && !IS_ROOT(dentry)
- && au_dcount(dentry) > 0
- && au_di(dentry)
- && (!arg->test || arg->test(dentry, arg->arg))) {
- arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC);
- if (unlikely(arg->err))
- ret = D_WALK_QUIT;
- }
-
- return ret;
-}
-
-int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
- au_dpages_test test, void *arg)
-{
- struct ac_dpages_arg args = {
- .err = 0,
- .dpages = dpages,
- .sb = root->d_sb,
- .test = test,
- .arg = arg
- };
-
- d_walk(root, &args, au_call_dpages_append, NULL);
-
- return args.err;
-}
-
-int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
- int do_include, au_dpages_test test, void *arg)
-{
- int err;
-
- err = 0;
- write_seqlock(&rename_lock);
- spin_lock(&dentry->d_lock);
- if (do_include
- && au_dcount(dentry) > 0
- && (!test || test(dentry, arg)))
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- spin_unlock(&dentry->d_lock);
- if (unlikely(err))
- goto out;
-
- /*
- * RCU for vfsmount is unnecessary since this is a traverse in a single
- * mount
- */
- while (!IS_ROOT(dentry)) {
- dentry = dentry->d_parent; /* rename_lock is locked */
- spin_lock(&dentry->d_lock);
- if (au_dcount(dentry) > 0
- && (!test || test(dentry, arg)))
- err = au_dpages_append(dpages, dentry, GFP_ATOMIC);
- spin_unlock(&dentry->d_lock);
- if (unlikely(err))
- break;
- }
-
-out:
- write_sequnlock(&rename_lock);
- return err;
-}
-
-static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg)
-{
- return au_di(dentry) && dentry->d_sb == arg;
-}
-
-int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
- struct dentry *dentry, int do_include)
-{
- return au_dcsub_pages_rev(dpages, dentry, do_include,
- au_dcsub_dpages_aufs, dentry->d_sb);
-}
-
-int au_test_subdir(struct dentry *d1, struct dentry *d2)
-{
- struct path path[2] = {
- {
- .dentry = d1
- },
- {
- .dentry = d2
- }
- };
-
- return path_is_under(path + 0, path + 1);
-}