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-rw-r--r--fs/aufs/sbinfo.c356
1 files changed, 0 insertions, 356 deletions
diff --git a/fs/aufs/sbinfo.c b/fs/aufs/sbinfo.c
deleted file mode 100644
index 4e59efc08..000000000
--- a/fs/aufs/sbinfo.c
+++ /dev/null
@@ -1,356 +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/>.
- */
-
-/*
- * superblock private data
- */
-
-#include "aufs.h"
-
-/*
- * they are necessary regardless sysfs is disabled.
- */
-void au_si_free(struct kobject *kobj)
-{
- int i;
- struct au_sbinfo *sbinfo;
- char *locked __maybe_unused; /* debug only */
-
- sbinfo = container_of(kobj, struct au_sbinfo, si_kobj);
- for (i = 0; i < AuPlink_NHASH; i++)
- AuDebugOn(!hlist_empty(&sbinfo->si_plink[i].head));
- AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len));
-
- au_rw_write_lock(&sbinfo->si_rwsem);
- au_br_free(sbinfo);
- au_rw_write_unlock(&sbinfo->si_rwsem);
-
- AuDebugOn(radix_tree_gang_lookup
- (&sbinfo->au_si_pid.tree, (void **)&locked,
- /*first_index*/PID_MAX_DEFAULT - 1,
- /*max_items*/sizeof(locked)/sizeof(*locked)));
-
- kfree(sbinfo->si_branch);
- kfree(sbinfo->au_si_pid.bitmap);
- mutex_destroy(&sbinfo->si_xib_mtx);
- AuRwDestroy(&sbinfo->si_rwsem);
-
- kfree(sbinfo);
-}
-
-int au_si_alloc(struct super_block *sb)
-{
- int err, i;
- struct au_sbinfo *sbinfo;
- static struct lock_class_key aufs_si;
-
- err = -ENOMEM;
- sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS);
- if (unlikely(!sbinfo))
- goto out;
-
- BUILD_BUG_ON(sizeof(unsigned long) !=
- sizeof(*sbinfo->au_si_pid.bitmap));
- sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT),
- sizeof(*sbinfo->au_si_pid.bitmap),
- GFP_NOFS);
- if (unlikely(!sbinfo->au_si_pid.bitmap))
- goto out_sbinfo;
-
- /* will be reallocated separately */
- sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS);
- if (unlikely(!sbinfo->si_branch))
- goto out_pidmap;
-
- err = sysaufs_si_init(sbinfo);
- if (unlikely(err))
- goto out_br;
-
- au_nwt_init(&sbinfo->si_nowait);
- au_rw_init_wlock(&sbinfo->si_rwsem);
- au_rw_class(&sbinfo->si_rwsem, &aufs_si);
- spin_lock_init(&sbinfo->au_si_pid.tree_lock);
- INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL);
-
- atomic_long_set(&sbinfo->si_ninodes, 0);
- atomic_long_set(&sbinfo->si_nfiles, 0);
-
- sbinfo->si_bend = -1;
- sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2;
-
- sbinfo->si_wbr_copyup = AuWbrCopyup_Def;
- sbinfo->si_wbr_create = AuWbrCreate_Def;
- sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup;
- sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create;
-
- au_fhsm_init(sbinfo);
-
- sbinfo->si_mntflags = au_opts_plink(AuOpt_Def);
-
- sbinfo->si_xino_jiffy = jiffies;
- sbinfo->si_xino_expire
- = msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC);
- mutex_init(&sbinfo->si_xib_mtx);
- sbinfo->si_xino_brid = -1;
- /* leave si_xib_last_pindex and si_xib_next_bit */
-
- au_sphl_init(&sbinfo->si_aopen);
-
- sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC);
- sbinfo->si_rdblk = AUFS_RDBLK_DEF;
- sbinfo->si_rdhash = AUFS_RDHASH_DEF;
- sbinfo->si_dirwh = AUFS_DIRWH_DEF;
-
- for (i = 0; i < AuPlink_NHASH; i++)
- au_sphl_init(sbinfo->si_plink + i);
- init_waitqueue_head(&sbinfo->si_plink_wq);
- spin_lock_init(&sbinfo->si_plink_maint_lock);
-
- au_sphl_init(&sbinfo->si_files);
-
- /* leave other members for sysaufs and si_mnt. */
- sbinfo->si_sb = sb;
- sb->s_fs_info = sbinfo;
- si_pid_set(sb);
- return 0; /* success */
-
-out_br:
- kfree(sbinfo->si_branch);
-out_pidmap:
- kfree(sbinfo->au_si_pid.bitmap);
-out_sbinfo:
- kfree(sbinfo);
-out:
- return err;
-}
-
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr)
-{
- int err, sz;
- struct au_branch **brp;
-
- AuRwMustWriteLock(&sbinfo->si_rwsem);
-
- err = -ENOMEM;
- sz = sizeof(*brp) * (sbinfo->si_bend + 1);
- if (unlikely(!sz))
- sz = sizeof(*brp);
- brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS);
- if (brp) {
- sbinfo->si_branch = brp;
- err = 0;
- }
-
- return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-unsigned int au_sigen_inc(struct super_block *sb)
-{
- unsigned int gen;
- struct inode *inode;
-
- SiMustWriteLock(sb);
-
- gen = ++au_sbi(sb)->si_generation;
- au_update_digen(sb->s_root);
- inode = d_inode(sb->s_root);
- au_update_iigen(inode, /*half*/0);
- inode->i_version++;
- return gen;
-}
-
-aufs_bindex_t au_new_br_id(struct super_block *sb)
-{
- aufs_bindex_t br_id;
- int i;
- struct au_sbinfo *sbinfo;
-
- SiMustWriteLock(sb);
-
- sbinfo = au_sbi(sb);
- for (i = 0; i <= AUFS_BRANCH_MAX; i++) {
- br_id = ++sbinfo->si_last_br_id;
- AuDebugOn(br_id < 0);
- if (br_id && au_br_index(sb, br_id) < 0)
- return br_id;
- }
-
- return -1;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* it is ok that new 'nwt' tasks are appended while we are sleeping */
-int si_read_lock(struct super_block *sb, int flags)
-{
- int err;
-
- err = 0;
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
-
- si_noflush_read_lock(sb);
- err = au_plink_maint(sb, flags);
- if (unlikely(err))
- si_read_unlock(sb);
-
- return err;
-}
-
-int si_write_lock(struct super_block *sb, int flags)
-{
- int err;
-
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
-
- si_noflush_write_lock(sb);
- err = au_plink_maint(sb, flags);
- if (unlikely(err))
- si_write_unlock(sb);
-
- return err;
-}
-
-/* dentry and super_block lock. call at entry point */
-int aufs_read_lock(struct dentry *dentry, int flags)
-{
- int err;
- struct super_block *sb;
-
- sb = dentry->d_sb;
- err = si_read_lock(sb, flags);
- if (unlikely(err))
- goto out;
-
- if (au_ftest_lock(flags, DW))
- di_write_lock_child(dentry);
- else
- di_read_lock_child(dentry, flags);
-
- if (au_ftest_lock(flags, GEN)) {
- err = au_digen_test(dentry, au_sigen(sb));
- AuDebugOn(!err && au_dbrange_test(dentry));
- if (unlikely(err))
- aufs_read_unlock(dentry, flags);
- }
-
-out:
- return err;
-}
-
-void aufs_read_unlock(struct dentry *dentry, int flags)
-{
- if (au_ftest_lock(flags, DW))
- di_write_unlock(dentry);
- else
- di_read_unlock(dentry, flags);
- si_read_unlock(dentry->d_sb);
-}
-
-void aufs_write_lock(struct dentry *dentry)
-{
- si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW);
- di_write_lock_child(dentry);
-}
-
-void aufs_write_unlock(struct dentry *dentry)
-{
- di_write_unlock(dentry);
- si_write_unlock(dentry->d_sb);
-}
-
-int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags)
-{
- int err;
- unsigned int sigen;
- struct super_block *sb;
-
- sb = d1->d_sb;
- err = si_read_lock(sb, flags);
- if (unlikely(err))
- goto out;
-
- di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR));
-
- if (au_ftest_lock(flags, GEN)) {
- sigen = au_sigen(sb);
- err = au_digen_test(d1, sigen);
- AuDebugOn(!err && au_dbrange_test(d1));
- if (!err) {
- err = au_digen_test(d2, sigen);
- AuDebugOn(!err && au_dbrange_test(d2));
- }
- if (unlikely(err))
- aufs_read_and_write_unlock2(d1, d2);
- }
-
-out:
- return err;
-}
-
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2)
-{
- di_write_unlock2(d1, d2);
- si_read_unlock(d1->d_sb);
-}
-
-/* ---------------------------------------------------------------------- */
-
-int si_pid_test_slow(struct super_block *sb)
-{
- void *p;
-
- rcu_read_lock();
- p = radix_tree_lookup(&au_sbi(sb)->au_si_pid.tree, current->pid);
- rcu_read_unlock();
-
- return (long)!!p;
-}
-
-void si_pid_set_slow(struct super_block *sb)
-{
- int err;
- struct au_sbinfo *sbinfo;
-
- AuDebugOn(si_pid_test_slow(sb));
-
- sbinfo = au_sbi(sb);
- err = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL);
- AuDebugOn(err);
- spin_lock(&sbinfo->au_si_pid.tree_lock);
- err = radix_tree_insert(&sbinfo->au_si_pid.tree, current->pid,
- /*any valid ptr*/sb);
- spin_unlock(&sbinfo->au_si_pid.tree_lock);
- AuDebugOn(err);
- radix_tree_preload_end();
-}
-
-void si_pid_clr_slow(struct super_block *sb)
-{
- void *p;
- struct au_sbinfo *sbinfo;
-
- AuDebugOn(!si_pid_test_slow(sb));
-
- sbinfo = au_sbi(sb);
- spin_lock(&sbinfo->au_si_pid.tree_lock);
- p = radix_tree_delete(&sbinfo->au_si_pid.tree, current->pid);
- spin_unlock(&sbinfo->au_si_pid.tree_lock);
-}
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