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-rw-r--r--fs/aufs/super.h635
1 files changed, 0 insertions, 635 deletions
diff --git a/fs/aufs/super.h b/fs/aufs/super.h
deleted file mode 100644
index 95ffbbb29..000000000
--- a/fs/aufs/super.h
+++ /dev/null
@@ -1,635 +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/>.
- */
-
-/*
- * super_block operations
- */
-
-#ifndef __AUFS_SUPER_H__
-#define __AUFS_SUPER_H__
-
-#ifdef __KERNEL__
-
-#include <linux/fs.h>
-#include <linux/kobject.h>
-#include "rwsem.h"
-#include "spl.h"
-#include "wkq.h"
-
-/* policies to select one among multiple writable branches */
-struct au_wbr_copyup_operations {
- int (*copyup)(struct dentry *dentry);
-};
-
-#define AuWbr_DIR 1 /* target is a dir */
-#define AuWbr_PARENT (1 << 1) /* always require a parent */
-
-#define au_ftest_wbr(flags, name) ((flags) & AuWbr_##name)
-#define au_fset_wbr(flags, name) { (flags) |= AuWbr_##name; }
-#define au_fclr_wbr(flags, name) { (flags) &= ~AuWbr_##name; }
-
-struct au_wbr_create_operations {
- int (*create)(struct dentry *dentry, unsigned int flags);
- int (*init)(struct super_block *sb);
- int (*fin)(struct super_block *sb);
-};
-
-struct au_wbr_mfs {
- struct mutex mfs_lock; /* protect this structure */
- unsigned long mfs_jiffy;
- unsigned long mfs_expire;
- aufs_bindex_t mfs_bindex;
-
- unsigned long long mfsrr_bytes;
- unsigned long long mfsrr_watermark;
-};
-
-struct pseudo_link {
- union {
- struct hlist_node hlist;
- struct rcu_head rcu;
- };
- struct inode *inode;
-};
-
-#define AuPlink_NHASH 100
-static inline int au_plink_hash(ino_t ino)
-{
- return ino % AuPlink_NHASH;
-}
-
-/* File-based Hierarchical Storage Management */
-struct au_fhsm {
-#ifdef CONFIG_AUFS_FHSM
- /* allow only one process who can receive the notification */
- spinlock_t fhsm_spin;
- pid_t fhsm_pid;
- wait_queue_head_t fhsm_wqh;
- atomic_t fhsm_readable;
-
- /* these are protected by si_rwsem */
- unsigned long fhsm_expire;
- aufs_bindex_t fhsm_bottom;
-#endif
-};
-
-struct au_branch;
-struct au_sbinfo {
- /* nowait tasks in the system-wide workqueue */
- struct au_nowait_tasks si_nowait;
-
- /*
- * tried sb->s_umount, but failed due to the dependecy between i_mutex.
- * rwsem for au_sbinfo is necessary.
- */
- struct au_rwsem si_rwsem;
-
- /* prevent recursive locking in deleting inode */
- struct {
- unsigned long *bitmap;
- spinlock_t tree_lock;
- struct radix_tree_root tree;
- } au_si_pid;
-
- /*
- * dirty approach to protect sb->sb_inodes and ->s_files (gone) from
- * remount.
- */
- atomic_long_t si_ninodes, si_nfiles;
-
- /* branch management */
- unsigned int si_generation;
-
- /* see AuSi_ flags */
- unsigned char au_si_status;
-
- aufs_bindex_t si_bend;
-
- /* dirty trick to keep br_id plus */
- unsigned int si_last_br_id :
- sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1;
- struct au_branch **si_branch;
-
- /* policy to select a writable branch */
- unsigned char si_wbr_copyup;
- unsigned char si_wbr_create;
- struct au_wbr_copyup_operations *si_wbr_copyup_ops;
- struct au_wbr_create_operations *si_wbr_create_ops;
-
- /* round robin */
- atomic_t si_wbr_rr_next;
-
- /* most free space */
- struct au_wbr_mfs si_wbr_mfs;
-
- /* File-based Hierarchical Storage Management */
- struct au_fhsm si_fhsm;
-
- /* mount flags */
- /* include/asm-ia64/siginfo.h defines a macro named si_flags */
- unsigned int si_mntflags;
-
- /* external inode number (bitmap and translation table) */
- vfs_readf_t si_xread;
- vfs_writef_t si_xwrite;
- struct file *si_xib;
- struct mutex si_xib_mtx; /* protect xib members */
- unsigned long *si_xib_buf;
- unsigned long si_xib_last_pindex;
- int si_xib_next_bit;
- aufs_bindex_t si_xino_brid;
- unsigned long si_xino_jiffy;
- unsigned long si_xino_expire;
- /* reserved for future use */
- /* unsigned long long si_xib_limit; */ /* Max xib file size */
-
-#ifdef CONFIG_AUFS_EXPORT
- /* i_generation */
- struct file *si_xigen;
- atomic_t si_xigen_next;
-#endif
-
- /* dirty trick to suppoer atomic_open */
- struct au_sphlhead si_aopen;
-
- /* vdir parameters */
- unsigned long si_rdcache; /* max cache time in jiffies */
- unsigned int si_rdblk; /* deblk size */
- unsigned int si_rdhash; /* hash size */
-
- /*
- * If the number of whiteouts are larger than si_dirwh, leave all of
- * them after au_whtmp_ren to reduce the cost of rmdir(2).
- * future fsck.aufs or kernel thread will remove them later.
- * Otherwise, remove all whiteouts and the dir in rmdir(2).
- */
- unsigned int si_dirwh;
-
- /* pseudo_link list */
- struct au_sphlhead si_plink[AuPlink_NHASH];
- wait_queue_head_t si_plink_wq;
- spinlock_t si_plink_maint_lock;
- pid_t si_plink_maint_pid;
-
- /* file list */
- struct au_sphlhead si_files;
-
- /*
- * sysfs and lifetime management.
- * this is not a small structure and it may be a waste of memory in case
- * of sysfs is disabled, particulary when many aufs-es are mounted.
- * but using sysfs is majority.
- */
- struct kobject si_kobj;
-#ifdef CONFIG_DEBUG_FS
- struct dentry *si_dbgaufs;
- struct dentry *si_dbgaufs_plink;
- struct dentry *si_dbgaufs_xib;
-#ifdef CONFIG_AUFS_EXPORT
- struct dentry *si_dbgaufs_xigen;
-#endif
-#endif
-
-#ifdef CONFIG_AUFS_SBILIST
- struct list_head si_list;
-#endif
-
- /* dirty, necessary for unmounting, sysfs and sysrq */
- struct super_block *si_sb;
-};
-
-/* sbinfo status flags */
-/*
- * set true when refresh_dirs() failed at remount time.
- * then try refreshing dirs at access time again.
- * if it is false, refreshing dirs at access time is unnecesary
- */
-#define AuSi_FAILED_REFRESH_DIR 1
-
-#define AuSi_FHSM (1 << 1) /* fhsm is active now */
-
-#ifndef CONFIG_AUFS_FHSM
-#undef AuSi_FHSM
-#define AuSi_FHSM 0
-#endif
-
-static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi,
- unsigned int flag)
-{
- AuRwMustAnyLock(&sbi->si_rwsem);
- return sbi->au_si_status & flag;
-}
-#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name)
-#define au_fset_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status |= AuSi_##name; \
-} while (0)
-#define au_fclr_si(sbinfo, name) do { \
- AuRwMustWriteLock(&(sbinfo)->si_rwsem); \
- (sbinfo)->au_si_status &= ~AuSi_##name; \
-} while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* policy to select one among writable branches */
-#define AuWbrCopyup(sbinfo, ...) \
- ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__))
-#define AuWbrCreate(sbinfo, ...) \
- ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__))
-
-/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */
-#define AuLock_DW 1 /* write-lock dentry */
-#define AuLock_IR (1 << 1) /* read-lock inode */
-#define AuLock_IW (1 << 2) /* write-lock inode */
-#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */
-#define AuLock_DIR (1 << 4) /* target is a dir */
-#define AuLock_NOPLM (1 << 5) /* return err in plm mode */
-#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */
-#define AuLock_GEN (1 << 7) /* test digen/iigen */
-#define au_ftest_lock(flags, name) ((flags) & AuLock_##name)
-#define au_fset_lock(flags, name) \
- do { (flags) |= AuLock_##name; } while (0)
-#define au_fclr_lock(flags, name) \
- do { (flags) &= ~AuLock_##name; } while (0)
-
-/* ---------------------------------------------------------------------- */
-
-/* super.c */
-extern struct file_system_type aufs_fs_type;
-struct inode *au_iget_locked(struct super_block *sb, ino_t ino);
-typedef unsigned long long (*au_arraycb_t)(void *array, unsigned long long max,
- void *arg);
-void au_array_free(void *array);
-void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg);
-struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max);
-void au_iarray_free(struct inode **a, unsigned long long max);
-
-/* sbinfo.c */
-void au_si_free(struct kobject *kobj);
-int au_si_alloc(struct super_block *sb);
-int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr);
-
-unsigned int au_sigen_inc(struct super_block *sb);
-aufs_bindex_t au_new_br_id(struct super_block *sb);
-
-int si_read_lock(struct super_block *sb, int flags);
-int si_write_lock(struct super_block *sb, int flags);
-int aufs_read_lock(struct dentry *dentry, int flags);
-void aufs_read_unlock(struct dentry *dentry, int flags);
-void aufs_write_lock(struct dentry *dentry);
-void aufs_write_unlock(struct dentry *dentry);
-int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags);
-void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2);
-
-int si_pid_test_slow(struct super_block *sb);
-void si_pid_set_slow(struct super_block *sb);
-void si_pid_clr_slow(struct super_block *sb);
-
-/* wbr_policy.c */
-extern struct au_wbr_copyup_operations au_wbr_copyup_ops[];
-extern struct au_wbr_create_operations au_wbr_create_ops[];
-int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst);
-int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex);
-int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t bstart);
-
-/* mvdown.c */
-int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg);
-
-#ifdef CONFIG_AUFS_FHSM
-/* fhsm.c */
-
-static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm)
-{
- pid_t pid;
-
- spin_lock(&fhsm->fhsm_spin);
- pid = fhsm->fhsm_pid;
- spin_unlock(&fhsm->fhsm_spin);
-
- return pid;
-}
-
-void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force);
-void au_fhsm_wrote_all(struct super_block *sb, int force);
-int au_fhsm_fd(struct super_block *sb, int oflags);
-int au_fhsm_br_alloc(struct au_branch *br);
-void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex);
-void au_fhsm_fin(struct super_block *sb);
-void au_fhsm_init(struct au_sbinfo *sbinfo);
-void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec);
-void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo);
-#else
-AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex,
- int force)
-AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force)
-AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags)
-AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm)
-AuStubInt0(au_fhsm_br_alloc, struct au_branch *br)
-AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex)
-AuStubVoid(au_fhsm_fin, struct super_block *sb)
-AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo)
-AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec)
-AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo)
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline struct au_sbinfo *au_sbi(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_EXPORT
-int au_test_nfsd(void);
-void au_export_init(struct super_block *sb);
-void au_xigen_inc(struct inode *inode);
-int au_xigen_new(struct inode *inode);
-int au_xigen_set(struct super_block *sb, struct file *base);
-void au_xigen_clr(struct super_block *sb);
-
-static inline int au_busy_or_stale(void)
-{
- if (!au_test_nfsd())
- return -EBUSY;
- return -ESTALE;
-}
-#else
-AuStubInt0(au_test_nfsd, void)
-AuStubVoid(au_export_init, struct super_block *sb)
-AuStubVoid(au_xigen_inc, struct inode *inode)
-AuStubInt0(au_xigen_new, struct inode *inode)
-AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base)
-AuStubVoid(au_xigen_clr, struct super_block *sb)
-AuStub(int, au_busy_or_stale, return -EBUSY, void)
-#endif /* CONFIG_AUFS_EXPORT */
-
-/* ---------------------------------------------------------------------- */
-
-#ifdef CONFIG_AUFS_SBILIST
-/* module.c */
-extern struct au_splhead au_sbilist;
-
-static inline void au_sbilist_init(void)
-{
- au_spl_init(&au_sbilist);
-}
-
-static inline void au_sbilist_add(struct super_block *sb)
-{
- au_spl_add(&au_sbi(sb)->si_list, &au_sbilist);
-}
-
-static inline void au_sbilist_del(struct super_block *sb)
-{
- au_spl_del(&au_sbi(sb)->si_list, &au_sbilist);
-}
-
-#ifdef CONFIG_AUFS_MAGIC_SYSRQ
-static inline void au_sbilist_lock(void)
-{
- spin_lock(&au_sbilist.spin);
-}
-
-static inline void au_sbilist_unlock(void)
-{
- spin_unlock(&au_sbilist.spin);
-}
-#define AuGFP_SBILIST GFP_ATOMIC
-#else
-AuStubVoid(au_sbilist_lock, void)
-AuStubVoid(au_sbilist_unlock, void)
-#define AuGFP_SBILIST GFP_NOFS
-#endif /* CONFIG_AUFS_MAGIC_SYSRQ */
-#else
-AuStubVoid(au_sbilist_init, void)
-AuStubVoid(au_sbilist_add, struct super_block *sb)
-AuStubVoid(au_sbilist_del, struct super_block *sb)
-AuStubVoid(au_sbilist_lock, void)
-AuStubVoid(au_sbilist_unlock, void)
-#define AuGFP_SBILIST GFP_NOFS
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo)
-{
- /*
- * This function is a dynamic '__init' function actually,
- * so the tiny check for si_rwsem is unnecessary.
- */
- /* AuRwMustWriteLock(&sbinfo->si_rwsem); */
-#ifdef CONFIG_DEBUG_FS
- sbinfo->si_dbgaufs = NULL;
- sbinfo->si_dbgaufs_plink = NULL;
- sbinfo->si_dbgaufs_xib = NULL;
-#ifdef CONFIG_AUFS_EXPORT
- sbinfo->si_dbgaufs_xigen = NULL;
-#endif
-#endif
-}
-
-/* ---------------------------------------------------------------------- */
-
-static inline pid_t si_pid_bit(void)
-{
- /* the origin of pid is 1, but the bitmap's is 0 */
- return current->pid - 1;
-}
-
-static inline int si_pid_test(struct super_block *sb)
-{
- pid_t bit;
-
- bit = si_pid_bit();
- if (bit < PID_MAX_DEFAULT)
- return test_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
- return si_pid_test_slow(sb);
-}
-
-static inline void si_pid_set(struct super_block *sb)
-{
- pid_t bit;
-
- bit = si_pid_bit();
- if (bit < PID_MAX_DEFAULT) {
- AuDebugOn(test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
- set_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
- /* smp_mb(); */
- } else
- si_pid_set_slow(sb);
-}
-
-static inline void si_pid_clr(struct super_block *sb)
-{
- pid_t bit;
-
- bit = si_pid_bit();
- if (bit < PID_MAX_DEFAULT) {
- AuDebugOn(!test_bit(bit, au_sbi(sb)->au_si_pid.bitmap));
- clear_bit(bit, au_sbi(sb)->au_si_pid.bitmap);
- /* smp_mb(); */
- } else
- si_pid_clr_slow(sb);
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* lock superblock. mainly for entry point functions */
-/*
- * __si_read_lock, __si_write_lock,
- * __si_read_unlock, __si_write_unlock, __si_downgrade_lock
- */
-AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem);
-
-#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem)
-#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem)
-#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem)
-
-static inline void si_noflush_read_lock(struct super_block *sb)
-{
- __si_read_lock(sb);
- si_pid_set(sb);
-}
-
-static inline int si_noflush_read_trylock(struct super_block *sb)
-{
- int locked;
-
- locked = __si_read_trylock(sb);
- if (locked)
- si_pid_set(sb);
- return locked;
-}
-
-static inline void si_noflush_write_lock(struct super_block *sb)
-{
- __si_write_lock(sb);
- si_pid_set(sb);
-}
-
-static inline int si_noflush_write_trylock(struct super_block *sb)
-{
- int locked;
-
- locked = __si_write_trylock(sb);
- if (locked)
- si_pid_set(sb);
- return locked;
-}
-
-#if 0 /* reserved */
-static inline int si_read_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_read_trylock(sb);
-}
-#endif
-
-static inline void si_read_unlock(struct super_block *sb)
-{
- si_pid_clr(sb);
- __si_read_unlock(sb);
-}
-
-#if 0 /* reserved */
-static inline int si_write_trylock(struct super_block *sb, int flags)
-{
- if (au_ftest_lock(flags, FLUSH))
- au_nwt_flush(&au_sbi(sb)->si_nowait);
- return si_noflush_write_trylock(sb);
-}
-#endif
-
-static inline void si_write_unlock(struct super_block *sb)
-{
- si_pid_clr(sb);
- __si_write_unlock(sb);
-}
-
-#if 0 /* reserved */
-static inline void si_downgrade_lock(struct super_block *sb)
-{
- __si_downgrade_lock(sb);
-}
-#endif
-
-/* ---------------------------------------------------------------------- */
-
-static inline aufs_bindex_t au_sbend(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_bend;
-}
-
-static inline unsigned int au_mntflags(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_mntflags;
-}
-
-static inline unsigned int au_sigen(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_generation;
-}
-
-static inline void au_ninodes_inc(struct super_block *sb)
-{
- atomic_long_inc(&au_sbi(sb)->si_ninodes);
-}
-
-static inline void au_ninodes_dec(struct super_block *sb)
-{
- AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_ninodes));
- atomic_long_dec(&au_sbi(sb)->si_ninodes);
-}
-
-static inline void au_nfiles_inc(struct super_block *sb)
-{
- atomic_long_inc(&au_sbi(sb)->si_nfiles);
-}
-
-static inline void au_nfiles_dec(struct super_block *sb)
-{
- AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_nfiles));
- atomic_long_dec(&au_sbi(sb)->si_nfiles);
-}
-
-static inline struct au_branch *au_sbr(struct super_block *sb,
- aufs_bindex_t bindex)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_branch[0 + bindex];
-}
-
-static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid)
-{
- SiMustWriteLock(sb);
- au_sbi(sb)->si_xino_brid = brid;
-}
-
-static inline aufs_bindex_t au_xino_brid(struct super_block *sb)
-{
- SiMustAnyLock(sb);
- return au_sbi(sb)->si_xino_brid;
-}
-
-#endif /* __KERNEL__ */
-#endif /* __AUFS_SUPER_H__ */
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