[PATCH 44/67] aufs inode operations
From: hooanon05
Date: Fri May 16 2008 - 11:06:08 EST
From: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
initial commit
aufs inode operations
Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx>
---
fs/aufs/inode.h | 336 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 336 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/inode.h b/fs/aufs/inode.h
new file mode 100644
index 0000000..6b6945f
--- /dev/null
+++ b/fs/aufs/inode.h
@@ -0,0 +1,336 @@
+/*
+ * Copyright (C) 2005-2008 Junjiro 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * inode operations
+ *
+ * $Id: inode.h,v 1.2 2008/04/21 01:32:05 sfjro Exp $
+ */
+
+#ifndef __AUFS_INODE_H__
+#define __AUFS_INODE_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/aufs_type.h>
+#include "hinode.h"
+#include "misc.h"
+#include "super.h"
+
+struct au_hinode;
+struct au_vdir;
+struct au_iinfo {
+ atomic_t ii_generation;
+ struct super_block *ii_hsb1; /* no get/put */
+
+ struct au_rwsem ii_rwsem;
+ aufs_bindex_t ii_bstart, ii_bend;
+ struct au_hinode *ii_hinode;
+ struct au_vdir *ii_vdir;
+};
+
+struct aufs_icntnr {
+ struct au_iinfo iinfo;
+ struct inode vfs_inode;
+};
+
+/* ---------------------------------------------------------------------- */
+
+/* inode.c */
+int au_refresh_hinode_self(struct inode *inode);
+int au_refresh_hinode(struct inode *inode, struct dentry *dentry);
+struct inode *au_new_inode(struct dentry *dentry);
+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 dlgt);
+int au_test_h_perm_sio(struct inode *h_inode, int mask, int dlgt);
+
+/* 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_LOCK_SRCDIR (1 << 1)
+#define AuWrDir_ISDIR (1 << 2)
+#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name)
+#define au_fset_wrdir(flags, name) { (flags) |= AuWrDir_##name; }
+#define au_fclr_wrdir(flags, name) { (flags) &= ~AuWrDir_##name; }
+
+struct au_wr_dir_args {
+ aufs_bindex_t force_btgt;
+ unsigned int flags;
+};
+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
+ struct au_wr_dir_args *args);
+
+/* i_op_add.c */
+struct au_ndx;
+int au_may_add(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir, struct au_ndx *ndx);
+int aufs_mknod(struct inode *dir, struct dentry *dentry, int 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, int mode,
+ struct nameidata *nd);
+int aufs_link(struct dentry *src_dentry, struct inode *dir,
+ struct dentry *dentry);
+int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+/* i_op_del.c */
+int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup,
+ struct dentry *locked);
+int au_may_del(struct dentry *dentry, aufs_bindex_t bindex,
+ struct dentry *h_parent, int isdir, struct au_ndx *ndx);
+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);
+
+#ifdef CONFIG_AUFS_DLGT
+/* dlgt.c */
+int au_security_inode_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int dlgt);
+#else
+static inline
+int au_security_inode_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int dlgt)
+{
+ return security_inode_permission(h_inode, mask, fake_nd);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+/* br_fuse.c */
+int aufs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st);
+#endif
+
+#if 0 // xattr
+/* xattr.c */
+int aufs_setxattr(struct dentry *dentry, const char *name, const void *value,
+ size_t sz, int flags);
+ssize_t aufs_getxattr(struct dentry *dentry, const char *name, void *value,
+ size_t sz);
+ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t sz);
+int aufs_removexattr(struct dentry *dentry, const char *name);
+#endif
+
+/* iinfo.c */
+struct au_iinfo *au_ii(struct inode *inode);
+struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex);
+aufs_bindex_t au_ii_br_id(struct inode *inode, aufs_bindex_t bindex);
+
+void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex);
+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_NOTIFY (1 << 1)
+#define au_ftest_hi(flags, name) ((flags) & AuHi_##name)
+#define au_fset_hi(flags, name) { (flags) |= AuHi_##name; }
+#define au_fclr_hi(flags, name) { (flags) &= ~AuHi_##name; }
+#ifndef CONFIG_AUFS_HINOTIFY
+#undef AuHi_NOTIFY
+#define AuHi_NOTIFY 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);
+void au_update_brange(struct inode *inode, int do_put_zero);
+
+int au_iinfo_init(struct inode *inode);
+void au_iinfo_fin(struct inode *inode);
+
+/* plink.c */
+#ifdef CONFIG_AUFS_DEBUG
+void au_plink_list(struct super_block *sb);
+#else
+static inline void au_plink_list(struct super_block *sb)
+{
+ /* nothing */
+}
+#endif
+int au_plink_test(struct super_block *sb, struct inode *inode);
+struct dentry *au_plink_lkup(struct super_block *sb, aufs_bindex_t bindex,
+ struct inode *inode);
+void au_plink_append(struct super_block *sb, struct inode *inode,
+ struct dentry *h_dentry, aufs_bindex_t bindex);
+void au_plink_put(struct super_block *sb);
+void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id);
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for iinfo */
+enum {
+ AuLsc_II_CHILD, /* child first */
+ AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hinotify */
+ AuLsc_II_CHILD3, /* copyup dirs */
+ AuLsc_II_PARENT,
+ AuLsc_II_PARENT2,
+ AuLsc_II_PARENT3,
+ AuLsc_II_PARENT4,
+ AuLsc_II_NEW /* new inode */
+};
+
+/*
+ * 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_parent4, ii_write_lock_parent4,
+ * ii_read_lock_new, ii_write_lock_new
+ */
+#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(parent4, PARENT4);
+AuRWLockFuncs(new, NEW);
+
+#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);
+
+/* to debug easier, do not make them inlined functions */
+#define IiMustReadLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustReadLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustWriteLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustWriteLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustAnyLock(i) do { \
+ SiMustAnyLock((i)->i_sb); \
+ AuRwMustAnyLock(&au_ii(i)->ii_rwsem); \
+} while (0)
+
+#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem)
+
+/* ---------------------------------------------------------------------- */
+
+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);
+ AuDebugOn(!S_ISDIR(inode->i_mode));
+ return au_ii(inode)->ii_vdir;
+}
+
+static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex)
+{
+ struct au_hinode *hinode;
+ IiMustAnyLock(inode);
+ hinode = au_ii(inode)->ii_hinode + bindex;
+ return hinode->hi_whdentry;
+}
+
+static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex)
+{
+ IiMustWriteLock(inode);
+ AuDebugOn(au_sbend(inode->i_sb) < bindex || bindex < au_ibstart(inode));
+ au_ii(inode)->ii_bend = bindex;
+}
+
+static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir)
+{
+ IiMustWriteLock(inode);
+ AuDebugOn(!S_ISDIR(inode->i_mode) || (au_ii(inode)->ii_vdir && vdir));
+ au_ii(inode)->ii_vdir = vdir;
+}
+
+static inline void au_hiput(struct au_hinode *hinode)
+{
+ au_hin_free(hinode);
+ dput(hinode->hi_whdentry);
+ iput(hinode->hi_inode);
+}
+
+static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex)
+{
+ //todo: this lock check causes some unnecessary locks in callers.
+ IiMustAnyLock(inode);
+ return au_ii(inode)->ii_hinode + bindex;
+}
+
+/* tiny test for inode number */
+/* tmpfs generation is too rough */
+static inline int au_test_higen(struct inode *inode, struct inode *h_inode)
+{
+ IiMustAnyLock(inode);
+ return !(au_ii(inode)->ii_hsb1 == h_inode->i_sb
+ && inode->i_generation == h_inode->i_generation);
+}
+
+static inline au_gen_t au_iigen(struct inode *inode)
+{
+ return atomic_read(&au_ii(inode)->ii_generation);
+}
+
+#ifdef CONFIG_AUFS_HINOTIFY
+static inline au_gen_t au_iigen_dec(struct inode *inode)
+{
+ //AuDbg("i%lu\n", inode->i_ino);
+ return atomic_dec_return(&au_ii(inode)->ii_generation);
+}
+#endif
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_INODE_H__ */
--
1.4.4.4
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