diff options
Diffstat (limited to 'fs/aufs/inode.h')
| -rw-r--r-- | fs/aufs/inode.h | 673 |
1 files changed, 0 insertions, 673 deletions
diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h deleted file mode 100644 index 1b9be356d..000000000 --- a/fs/aufs/inode.h +++ /dev/null @@ -1,673 +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/>. - */ - -/* - * inode operations - */ - -#ifndef __AUFS_INODE_H__ -#define __AUFS_INODE_H__ - -#ifdef __KERNEL__ - -#include <linux/fsnotify.h> -#include "rwsem.h" - -struct vfsmount; - -struct au_hnotify { -#ifdef CONFIG_AUFS_HNOTIFY -#ifdef CONFIG_AUFS_HFSNOTIFY - /* never use fsnotify_add_vfsmount_mark() */ - struct fsnotify_mark hn_mark; -#endif - struct inode *hn_aufs_inode; /* no get/put */ -#endif -} ____cacheline_aligned_in_smp; - -struct au_hinode { - struct inode *hi_inode; - aufs_bindex_t hi_id; -#ifdef CONFIG_AUFS_HNOTIFY - struct au_hnotify *hi_notify; -#endif - - /* reference to the copied-up whiteout with get/put */ - struct dentry *hi_whdentry; -}; - -/* ig_flags */ -#define AuIG_HALF_REFRESHED 1 -#define au_ig_ftest(flags, name) ((flags) & AuIG_##name) -#define au_ig_fset(flags, name) \ - do { (flags) |= AuIG_##name; } while (0) -#define au_ig_fclr(flags, name) \ - do { (flags) &= ~AuIG_##name; } while (0) - -struct au_iigen { - __u32 ig_generation, ig_flags; -}; - -struct au_vdir; -struct au_iinfo { - spinlock_t ii_genspin; - struct au_iigen ii_generation; - struct super_block *ii_hsb1; /* no get/put */ - - struct au_rwsem ii_rwsem; - aufs_bindex_t ii_bstart, ii_bend; - __u32 ii_higen; - struct au_hinode *ii_hinode; - struct au_vdir *ii_vdir; -}; - -struct au_icntnr { - struct au_iinfo iinfo; - struct inode vfs_inode; -} ____cacheline_aligned_in_smp; - -/* au_pin flags */ -#define AuPin_DI_LOCKED 1 -#define AuPin_MNT_WRITE (1 << 1) -#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) -#define au_fset_pin(flags, name) \ - do { (flags) |= AuPin_##name; } while (0) -#define au_fclr_pin(flags, name) \ - do { (flags) &= ~AuPin_##name; } while (0) - -struct au_pin { - /* input */ - struct dentry *dentry; - unsigned int udba; - unsigned char lsc_di, lsc_hi, flags; - aufs_bindex_t bindex; - - /* output */ - struct dentry *parent; - struct au_hinode *hdir; - struct vfsmount *h_mnt; - - /* temporary unlock/relock for copyup */ - struct dentry *h_dentry, *h_parent; - struct au_branch *br; - struct task_struct *task; -}; - -void au_pin_hdir_unlock(struct au_pin *p); -int au_pin_hdir_lock(struct au_pin *p); -int au_pin_hdir_relock(struct au_pin *p); -void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task); -void au_pin_hdir_acquire_nest(struct au_pin *p); -void au_pin_hdir_release(struct au_pin *p); - -/* ---------------------------------------------------------------------- */ - -static inline struct au_iinfo *au_ii(struct inode *inode) -{ - struct au_iinfo *iinfo; - - iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); - if (iinfo->ii_hinode) - return iinfo; - return NULL; /* debugging bad_inode case */ -} - -/* ---------------------------------------------------------------------- */ - -/* inode.c */ -struct inode *au_igrab(struct inode *inode); -int au_refresh_hinode_self(struct inode *inode); -int au_refresh_hinode(struct inode *inode, struct dentry *dentry); -int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, - unsigned int d_type, ino_t *ino); -struct inode *au_new_inode(struct dentry *dentry, int must_new); -int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, - struct inode *inode); -int au_test_h_perm(struct inode *h_inode, int mask); -int au_test_h_perm_sio(struct inode *h_inode, int mask); - -static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, - ino_t h_ino, unsigned int d_type, ino_t *ino) -{ -#ifdef CONFIG_AUFS_SHWH - return au_ino(sb, bindex, h_ino, d_type, ino); -#else - return 0; -#endif -} - -/* i_op.c */ -extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop; - -/* au_wr_dir flags */ -#define AuWrDir_ADD_ENTRY 1 -#define AuWrDir_ISDIR (1 << 1) -#define AuWrDir_TMPFILE (1 << 2) -#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) -#define au_fset_wrdir(flags, name) \ - do { (flags) |= AuWrDir_##name; } while (0) -#define au_fclr_wrdir(flags, name) \ - do { (flags) &= ~AuWrDir_##name; } while (0) - -struct au_wr_dir_args { - aufs_bindex_t force_btgt; - unsigned char flags; -}; -int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, - struct au_wr_dir_args *args); - -struct dentry *au_pinned_h_parent(struct au_pin *pin); -void au_pin_init(struct au_pin *pin, struct dentry *dentry, - aufs_bindex_t bindex, int lsc_di, int lsc_hi, - unsigned int udba, unsigned char flags); -int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, - unsigned int udba, unsigned char flags) __must_check; -int au_do_pin(struct au_pin *pin) __must_check; -void au_unpin(struct au_pin *pin); -int au_reval_for_attr(struct dentry *dentry, unsigned int sigen); - -#define AuIcpup_DID_CPUP 1 -#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) -#define au_fset_icpup(flags, name) \ - do { (flags) |= AuIcpup_##name; } while (0) -#define au_fclr_icpup(flags, name) \ - do { (flags) &= ~AuIcpup_##name; } while (0) - -struct au_icpup_args { - unsigned char flags; - unsigned char pin_flags; - aufs_bindex_t btgt; - unsigned int udba; - struct au_pin pin; - struct path h_path; - struct inode *h_inode; -}; - -int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, - struct au_icpup_args *a); - -int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path); - -/* i_op_add.c */ -int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, - struct dentry *h_parent, int isdir); -int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, - dev_t dev); -int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); -int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, - bool want_excl); -struct vfsub_aopen_args; -int au_aopen_or_create(struct inode *dir, struct dentry *dentry, - struct vfsub_aopen_args *args); -int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode); -int aufs_link(struct dentry *src_dentry, struct inode *dir, - struct dentry *dentry); -int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); - -/* i_op_del.c */ -int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); -int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, - struct dentry *h_parent, int isdir); -int aufs_unlink(struct inode *dir, struct dentry *dentry); -int aufs_rmdir(struct inode *dir, struct dentry *dentry); - -/* i_op_ren.c */ -int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); -int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, - struct inode *dir, struct dentry *dentry); - -/* iinfo.c */ -struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); -void au_hiput(struct au_hinode *hinode); -void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, - struct dentry *h_wh); -unsigned int au_hi_flags(struct inode *inode, int isdir); - -/* hinode flags */ -#define AuHi_XINO 1 -#define AuHi_HNOTIFY (1 << 1) -#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) -#define au_fset_hi(flags, name) \ - do { (flags) |= AuHi_##name; } while (0) -#define au_fclr_hi(flags, name) \ - do { (flags) &= ~AuHi_##name; } while (0) - -#ifndef CONFIG_AUFS_HNOTIFY -#undef AuHi_HNOTIFY -#define AuHi_HNOTIFY 0 -#endif - -void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, - struct inode *h_inode, unsigned int flags); - -void au_update_iigen(struct inode *inode, int half); -void au_update_ibrange(struct inode *inode, int do_put_zero); - -void au_icntnr_init_once(void *_c); -int au_iinfo_init(struct inode *inode); -void au_iinfo_fin(struct inode *inode); -int au_ii_realloc(struct au_iinfo *iinfo, int nbr); - -#ifdef CONFIG_PROC_FS -/* plink.c */ -int au_plink_maint(struct super_block *sb, int flags); -struct au_sbinfo; -void au_plink_maint_leave(struct au_sbinfo *sbinfo); -int au_plink_maint_enter(struct super_block *sb); -#ifdef CONFIG_AUFS_DEBUG -void au_plink_list(struct super_block *sb); -#else -AuStubVoid(au_plink_list, struct super_block *sb) -#endif -int au_plink_test(struct inode *inode); -struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); -void au_plink_append(struct inode *inode, aufs_bindex_t bindex, - struct dentry *h_dentry); -void au_plink_put(struct super_block *sb, int verbose); -void au_plink_clean(struct super_block *sb, int verbose); -void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); -#else -AuStubInt0(au_plink_maint, struct super_block *sb, int flags); -AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo); -AuStubInt0(au_plink_maint_enter, struct super_block *sb); -AuStubVoid(au_plink_list, struct super_block *sb); -AuStubInt0(au_plink_test, struct inode *inode); -AuStub(struct dentry *, au_plink_lkup, return NULL, - struct inode *inode, aufs_bindex_t bindex); -AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex, - struct dentry *h_dentry); -AuStubVoid(au_plink_put, struct super_block *sb, int verbose); -AuStubVoid(au_plink_clean, struct super_block *sb, int verbose); -AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id); -#endif /* CONFIG_PROC_FS */ - -#ifdef CONFIG_AUFS_XATTR -/* xattr.c */ -int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, - unsigned int verbose); -ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size); -ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value, - size_t size); -int aufs_setxattr(struct dentry *dentry, const char *name, const void *value, - size_t size, int flags); -int aufs_removexattr(struct dentry *dentry, const char *name); - -/* void au_xattr_init(struct super_block *sb); */ -#else -AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src, - int ignore_flags, unsigned int verbose); -/* AuStubVoid(au_xattr_init, struct super_block *sb); */ -#endif - -#ifdef CONFIG_FS_POSIX_ACL -struct posix_acl *aufs_get_acl(struct inode *inode, int type); -int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type); -#endif - -#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) -enum { - AU_XATTR_SET, - AU_XATTR_REMOVE, - AU_ACL_SET -}; - -struct au_srxattr { - int type; - union { - struct { - const char *name; - const void *value; - size_t size; - int flags; - } set; - struct { - const char *name; - } remove; - struct { - struct posix_acl *acl; - int type; - } acl_set; - } u; -}; -ssize_t au_srxattr(struct dentry *dentry, struct au_srxattr *arg); -#endif - -/* ---------------------------------------------------------------------- */ - -/* lock subclass for iinfo */ -enum { - AuLsc_II_CHILD, /* child first */ - AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ - AuLsc_II_CHILD3, /* copyup dirs */ - AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ - AuLsc_II_PARENT2, - AuLsc_II_PARENT3, /* copyup dirs */ - AuLsc_II_NEW_CHILD -}; - -/* - * ii_read_lock_child, ii_write_lock_child, - * ii_read_lock_child2, ii_write_lock_child2, - * ii_read_lock_child3, ii_write_lock_child3, - * ii_read_lock_parent, ii_write_lock_parent, - * ii_read_lock_parent2, ii_write_lock_parent2, - * ii_read_lock_parent3, ii_write_lock_parent3, - * ii_read_lock_new_child, ii_write_lock_new_child, - */ -#define AuReadLockFunc(name, lsc) \ -static inline void ii_read_lock_##name(struct inode *i) \ -{ \ - au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ -} - -#define AuWriteLockFunc(name, lsc) \ -static inline void ii_write_lock_##name(struct inode *i) \ -{ \ - au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ -} - -#define AuRWLockFuncs(name, lsc) \ - AuReadLockFunc(name, lsc) \ - AuWriteLockFunc(name, lsc) - -AuRWLockFuncs(child, CHILD); -AuRWLockFuncs(child2, CHILD2); -AuRWLockFuncs(child3, CHILD3); -AuRWLockFuncs(parent, PARENT); -AuRWLockFuncs(parent2, PARENT2); -AuRWLockFuncs(parent3, PARENT3); -AuRWLockFuncs(new_child, NEW_CHILD); - -#undef AuReadLockFunc -#undef AuWriteLockFunc -#undef AuRWLockFuncs - -/* - * ii_read_unlock, ii_write_unlock, ii_downgrade_lock - */ -AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem); - -#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) -#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) -#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) - -/* ---------------------------------------------------------------------- */ - -static inline void au_icntnr_init(struct au_icntnr *c) -{ -#ifdef CONFIG_AUFS_DEBUG - c->vfs_inode.i_mode = 0; -#endif -} - -static inline unsigned int au_iigen(struct inode *inode, struct au_iigen *iigen) -{ - unsigned int gen; - struct au_iinfo *iinfo; - - iinfo = au_ii(inode); - spin_lock(&iinfo->ii_genspin); - if (iigen) - *iigen = iinfo->ii_generation; - gen = iinfo->ii_generation.ig_generation; - spin_unlock(&iinfo->ii_genspin); - - return gen; -} - -/* tiny test for inode number */ -/* tmpfs generation is too rough */ -static inline int au_test_higen(struct inode *inode, struct inode *h_inode) -{ - struct au_iinfo *iinfo; - - iinfo = au_ii(inode); - AuRwMustAnyLock(&iinfo->ii_rwsem); - return !(iinfo->ii_hsb1 == h_inode->i_sb - && iinfo->ii_higen == h_inode->i_generation); -} - -static inline void au_iigen_dec(struct inode *inode) -{ - struct au_iinfo *iinfo; - - iinfo = au_ii(inode); - spin_lock(&iinfo->ii_genspin); - iinfo->ii_generation.ig_generation--; - spin_unlock(&iinfo->ii_genspin); -} - -static inline int au_iigen_test(struct inode *inode, unsigned int sigen) -{ - int err; - - err = 0; - if (unlikely(inode && au_iigen(inode, NULL) != sigen)) - err = -EIO; - - return err; -} - -/* ---------------------------------------------------------------------- */ - -static inline aufs_bindex_t au_ii_br_id(struct inode *inode, - aufs_bindex_t bindex) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_hinode[0 + bindex].hi_id; -} - -static inline aufs_bindex_t au_ibstart(struct inode *inode) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_bstart; -} - -static inline aufs_bindex_t au_ibend(struct inode *inode) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_bend; -} - -static inline struct au_vdir *au_ivdir(struct inode *inode) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_vdir; -} - -static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry; -} - -static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex) -{ - IiMustWriteLock(inode); - au_ii(inode)->ii_bstart = bindex; -} - -static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex) -{ - IiMustWriteLock(inode); - au_ii(inode)->ii_bend = bindex; -} - -static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) -{ - IiMustWriteLock(inode); - au_ii(inode)->ii_vdir = vdir; -} - -static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) -{ - IiMustAnyLock(inode); - return au_ii(inode)->ii_hinode + bindex; -} - -/* ---------------------------------------------------------------------- */ - -static inline struct dentry *au_pinned_parent(struct au_pin *pin) -{ - if (pin) - return pin->parent; - return NULL; -} - -static inline struct inode *au_pinned_h_dir(struct au_pin *pin) -{ - if (pin && pin->hdir) - return pin->hdir->hi_inode; - return NULL; -} - -static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) -{ - if (pin) - return pin->hdir; - return NULL; -} - -static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) -{ - if (pin) - pin->dentry = dentry; -} - -static inline void au_pin_set_parent_lflag(struct au_pin *pin, - unsigned char lflag) -{ - if (pin) { - if (lflag) - au_fset_pin(pin->flags, DI_LOCKED); - else - au_fclr_pin(pin->flags, DI_LOCKED); - } -} - -#if 0 /* reserved */ -static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) -{ - if (pin) { - dput(pin->parent); - pin->parent = dget(parent); - } -} -#endif - -/* ---------------------------------------------------------------------- */ - -struct au_branch; -#ifdef CONFIG_AUFS_HNOTIFY -struct au_hnotify_op { - void (*ctl)(struct au_hinode *hinode, int do_set); - int (*alloc)(struct au_hinode *hinode); - - /* - * if it returns true, the the caller should free hinode->hi_notify, - * otherwise ->free() frees it. - */ - int (*free)(struct au_hinode *hinode, - struct au_hnotify *hn) __must_check; - - void (*fin)(void); - int (*init)(void); - - int (*reset_br)(unsigned int udba, struct au_branch *br, int perm); - void (*fin_br)(struct au_branch *br); - int (*init_br)(struct au_branch *br, int perm); -}; - -/* hnotify.c */ -int au_hn_alloc(struct au_hinode *hinode, struct inode *inode); -void au_hn_free(struct au_hinode *hinode); -void au_hn_ctl(struct au_hinode *hinode, int do_set); -void au_hn_reset(struct inode *inode, unsigned int flags); -int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, - struct qstr *h_child_qstr, struct inode *h_child_inode); -int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm); -int au_hnotify_init_br(struct au_branch *br, int perm); -void au_hnotify_fin_br(struct au_branch *br); -int __init au_hnotify_init(void); -void au_hnotify_fin(void); - -/* hfsnotify.c */ -extern const struct au_hnotify_op au_hnotify_op; - -static inline -void au_hn_init(struct au_hinode *hinode) -{ - hinode->hi_notify = NULL; -} - -static inline struct au_hnotify *au_hn(struct au_hinode *hinode) -{ - return hinode->hi_notify; -} - -#else -AuStub(int, au_hn_alloc, return -EOPNOTSUPP, - struct au_hinode *hinode __maybe_unused, - struct inode *inode __maybe_unused) -AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode) -AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) -AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, - int do_set __maybe_unused) -AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, - unsigned int flags __maybe_unused) -AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused, - struct au_branch *br __maybe_unused, - int perm __maybe_unused) -AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused, - int perm __maybe_unused) -AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused) -AuStubInt0(__init au_hnotify_init, void) -AuStubVoid(au_hnotify_fin, void) -AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) -#endif /* CONFIG_AUFS_HNOTIFY */ - -static inline void au_hn_suspend(struct au_hinode *hdir) -{ - au_hn_ctl(hdir, /*do_set*/0); -} - -static inline void au_hn_resume(struct au_hinode *hdir) -{ - au_hn_ctl(hdir, /*do_set*/1); -} - -static inline void au_hn_imtx_lock(struct au_hinode *hdir) -{ - mutex_lock(&hdir->hi_inode->i_mutex); - au_hn_suspend(hdir); -} - -static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir, - unsigned int sc __maybe_unused) -{ - mutex_lock_nested(&hdir->hi_inode->i_mutex, sc); - au_hn_suspend(hdir); -} - -static inline void au_hn_imtx_unlock(struct au_hinode *hdir) -{ - au_hn_resume(hdir); - mutex_unlock(&hdir->hi_inode->i_mutex); -} - -#endif /* __KERNEL__ */ -#endif /* __AUFS_INODE_H__ */ |