mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 15:11:00 +07:00
365 lines
9.3 KiB
C
365 lines
9.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2005-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* branch filesystems and xino for them
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*/
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#ifndef __AUFS_BRANCH_H__
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#define __AUFS_BRANCH_H__
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#ifdef __KERNEL__
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#include <linux/mount.h>
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#include "dirren.h"
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#include "dynop.h"
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#include "lcnt.h"
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#include "rwsem.h"
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#include "super.h"
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/* ---------------------------------------------------------------------- */
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/* a xino file */
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struct au_xino {
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struct file **xi_file;
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unsigned int xi_nfile;
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struct {
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spinlock_t spin;
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ino_t *array;
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int total;
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/* reserved for future use */
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/* unsigned long *bitmap; */
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wait_queue_head_t wqh;
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} xi_nondir;
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struct mutex xi_mtx; /* protects xi_file array */
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struct hlist_bl_head xi_writing;
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atomic_t xi_truncating;
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struct kref xi_kref;
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};
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/* File-based Hierarchical Storage Management */
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struct au_br_fhsm {
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#ifdef CONFIG_AUFS_FHSM
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struct mutex bf_lock;
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unsigned long bf_jiffy;
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struct aufs_stfs bf_stfs;
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int bf_readable;
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#endif
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};
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/* members for writable branch only */
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enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last};
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struct au_wbr {
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struct au_rwsem wbr_wh_rwsem;
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struct dentry *wbr_wh[AuBrWh_Last];
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atomic_t wbr_wh_running;
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#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */
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#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */
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#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */
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/* mfs mode */
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unsigned long long wbr_bytes;
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};
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/* ext2 has 3 types of operations at least, ext3 has 4 */
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#define AuBrDynOp (AuDyLast * 4)
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#ifdef CONFIG_AUFS_HFSNOTIFY
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/* support for asynchronous destruction */
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struct au_br_hfsnotify {
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struct fsnotify_group *hfsn_group;
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};
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#endif
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/* sysfs entries */
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struct au_brsysfs {
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char name[16];
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struct attribute attr;
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};
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enum {
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AuBrSysfs_BR,
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AuBrSysfs_BRID,
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AuBrSysfs_Last
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};
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/* protected by superblock rwsem */
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struct au_branch {
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struct au_xino *br_xino;
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aufs_bindex_t br_id;
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int br_perm;
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struct path br_path;
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spinlock_t br_dykey_lock;
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struct au_dykey *br_dykey[AuBrDynOp];
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au_lcnt_t br_nfiles; /* opened files */
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au_lcnt_t br_count; /* in-use for other */
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struct au_wbr *br_wbr;
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struct au_br_fhsm *br_fhsm;
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#ifdef CONFIG_AUFS_HFSNOTIFY
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struct au_br_hfsnotify *br_hfsn;
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#endif
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#ifdef CONFIG_SYSFS
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/* entries under sysfs per mount-point */
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struct au_brsysfs br_sysfs[AuBrSysfs_Last];
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#endif
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#ifdef CONFIG_DEBUG_FS
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struct dentry *br_dbgaufs; /* xino */
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#endif
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struct au_dr_br br_dirren;
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};
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/* ---------------------------------------------------------------------- */
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static inline struct vfsmount *au_br_mnt(struct au_branch *br)
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{
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return br->br_path.mnt;
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}
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static inline struct dentry *au_br_dentry(struct au_branch *br)
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{
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return br->br_path.dentry;
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}
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static inline struct super_block *au_br_sb(struct au_branch *br)
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{
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return au_br_mnt(br)->mnt_sb;
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}
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static inline int au_br_rdonly(struct au_branch *br)
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{
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return (sb_rdonly(au_br_sb(br))
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|| !au_br_writable(br->br_perm))
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? -EROFS : 0;
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}
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static inline int au_br_hnotifyable(int brperm __maybe_unused)
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{
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#ifdef CONFIG_AUFS_HNOTIFY
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return !(brperm & AuBrPerm_RR);
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#else
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return 0;
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#endif
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}
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static inline int au_br_test_oflag(int oflag, struct au_branch *br)
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{
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int err, exec_flag;
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err = 0;
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exec_flag = oflag & __FMODE_EXEC;
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if (unlikely(exec_flag && path_noexec(&br->br_path)))
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err = -EACCES;
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return err;
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}
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static inline void au_xino_get(struct au_branch *br)
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{
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struct au_xino *xi;
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xi = br->br_xino;
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if (xi)
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kref_get(&xi->xi_kref);
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}
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static inline int au_xino_count(struct au_branch *br)
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{
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int v;
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struct au_xino *xi;
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v = 0;
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xi = br->br_xino;
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if (xi)
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v = kref_read(&xi->xi_kref);
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return v;
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}
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/* ---------------------------------------------------------------------- */
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/* branch.c */
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struct au_sbinfo;
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void au_br_free(struct au_sbinfo *sinfo);
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int au_br_index(struct super_block *sb, aufs_bindex_t br_id);
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struct au_opt_add;
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int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount);
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struct au_opt_del;
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int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount);
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long au_ibusy_ioctl(struct file *file, unsigned long arg);
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#ifdef CONFIG_COMPAT
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long au_ibusy_compat_ioctl(struct file *file, unsigned long arg);
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#endif
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struct au_opt_mod;
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int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount,
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int *do_refresh);
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struct aufs_stfs;
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int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs);
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/* xino.c */
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static const loff_t au_loff_max = LLONG_MAX;
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aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry);
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struct file *au_xino_create(struct super_block *sb, char *fpath, int silent,
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int wbrtop);
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struct file *au_xino_create2(struct super_block *sb, struct path *base,
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struct file *copy_src);
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struct au_xi_new {
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struct au_xino *xi; /* switch between xino and xigen */
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int idx;
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struct path *base;
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struct file *copy_src;
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};
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struct file *au_xi_new(struct super_block *sb, struct au_xi_new *xinew);
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int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
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ino_t *ino);
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int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
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ino_t ino);
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ssize_t xino_fread(struct file *file, void *buf, size_t size, loff_t *pos);
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ssize_t xino_fwrite(struct file *file, void *buf, size_t size, loff_t *pos);
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int au_xib_trunc(struct super_block *sb);
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int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex, int idx_begin);
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struct au_xino *au_xino_alloc(unsigned int nfile);
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int au_xino_put(struct au_branch *br);
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struct file *au_xino_file1(struct au_xino *xi);
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struct au_opt_xino;
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void au_xino_clr(struct super_block *sb);
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int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount);
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struct file *au_xino_def(struct super_block *sb);
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int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t hino,
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struct path *base);
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ino_t au_xino_new_ino(struct super_block *sb);
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void au_xino_delete_inode(struct inode *inode, const int unlinked);
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void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex,
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ino_t h_ino, int idx);
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int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino,
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int *idx);
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int au_xino_path(struct seq_file *seq, struct file *file);
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/* ---------------------------------------------------------------------- */
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/* @idx is signed to accept -1 meaning the first file */
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static inline struct file *au_xino_file(struct au_xino *xi, int idx)
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{
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struct file *file;
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file = NULL;
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if (!xi)
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goto out;
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if (idx >= 0) {
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if (idx < xi->xi_nfile)
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file = xi->xi_file[idx];
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} else
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file = au_xino_file1(xi);
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out:
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return file;
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}
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/* ---------------------------------------------------------------------- */
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/* Superblock to branch */
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static inline
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aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex)
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{
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return au_sbr(sb, bindex)->br_id;
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}
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static inline
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struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex)
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{
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return au_br_mnt(au_sbr(sb, bindex));
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}
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static inline
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struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex)
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{
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return au_br_sb(au_sbr(sb, bindex));
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}
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static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex)
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{
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return au_sbr(sb, bindex)->br_perm;
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}
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static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex)
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{
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return au_br_whable(au_sbr_perm(sb, bindex));
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}
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/* ---------------------------------------------------------------------- */
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#define wbr_wh_read_lock(wbr) au_rw_read_lock(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_write_lock(wbr) au_rw_write_lock(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_read_trylock(wbr) au_rw_read_trylock(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_write_trylock(wbr) au_rw_write_trylock(&(wbr)->wbr_wh_rwsem)
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/*
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#define wbr_wh_read_trylock_nested(wbr) \
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au_rw_read_trylock_nested(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_write_trylock_nested(wbr) \
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au_rw_write_trylock_nested(&(wbr)->wbr_wh_rwsem)
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*/
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#define wbr_wh_read_unlock(wbr) au_rw_read_unlock(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_write_unlock(wbr) au_rw_write_unlock(&(wbr)->wbr_wh_rwsem)
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#define wbr_wh_downgrade_lock(wbr) au_rw_dgrade_lock(&(wbr)->wbr_wh_rwsem)
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#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&(wbr)->wbr_wh_rwsem)
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#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&(wbr)->wbr_wh_rwsem)
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#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&(wbr)->wbr_wh_rwsem)
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/* ---------------------------------------------------------------------- */
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#ifdef CONFIG_AUFS_FHSM
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static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm)
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{
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mutex_init(&brfhsm->bf_lock);
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brfhsm->bf_jiffy = 0;
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brfhsm->bf_readable = 0;
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}
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static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm)
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{
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mutex_destroy(&brfhsm->bf_lock);
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}
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#else
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AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm)
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AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm)
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#endif
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#endif /* __KERNEL__ */
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#endif /* __AUFS_BRANCH_H__ */
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