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Date: Fri, 16 May 2008 23:33:01 +0900
From: hooanon05@...oo.co.jp
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Junjiro Okajima <hooanon05@...oo.co.jp>
Subject: [PATCH 47/67] aufs inode operations (except add/del/rename)
From: Junjiro Okajima <hooanon05@...oo.co.jp>
initial commit
aufs inode operations (except add/del/rename)
Signed-off-by: Junjiro Okajima <hooanon05@...oo.co.jp>
---
fs/aufs/i_op.c | 844 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 844 insertions(+), 0 deletions(-)
diff --git a/fs/aufs/i_op.c b/fs/aufs/i_op.c
new file mode 100644
index 0000000..2efa931
--- /dev/null
+++ b/fs/aufs/i_op.c
@@ -0,0 +1,844 @@
+/*
+ * 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 (except add/del/rename)
+ *
+ * $Id: i_op.c,v 1.4 2008/05/04 23:54:53 sfjro Exp $
+ */
+
+//#include <linux/fs.h>
+#include <linux/fs_stack.h>
+//#include <linux/namei.h>
+//#include <linux/mm.h>
+#include <linux/uaccess.h>
+#include "aufs.h"
+
+static int h_permission(struct inode *h_inode, int mask,
+ struct nameidata *fake_nd, int brperm, int dlgt)
+{
+ int err, submask;
+ const int write_mask = (mask & (MAY_WRITE | MAY_APPEND));
+
+ LKTRTrace("ino %lu, mask 0x%x, brperm 0x%x\n",
+ h_inode->i_ino, mask, brperm);
+
+ err = -EACCES;
+ if (unlikely((write_mask && IS_IMMUTABLE(h_inode))
+ || ((mask & MAY_EXEC) && S_ISREG(h_inode->i_mode)
+ && fake_nd && fake_nd->path.mnt
+ && (fake_nd->path.mnt->mnt_flags & MNT_NOEXEC))
+ ))
+ goto out;
+
+ /* skip hidden fs test in the case of write to ro branch */
+ submask = mask & ~MAY_APPEND;
+ if (unlikely((write_mask && !au_br_writable(brperm))
+ || !h_inode->i_op
+ || !h_inode->i_op->permission)) {
+ //LKTRLabel(generic_permission);
+ err = generic_permission(h_inode, submask, NULL);
+ } else {
+ //LKTRLabel(h_inode->permission);
+ err = h_inode->i_op->permission(h_inode, submask, fake_nd);
+ AuTraceErr(err);
+ }
+
+#if 1
+ if (!err)
+ err = au_security_inode_permission(h_inode, mask, fake_nd,
+ dlgt);
+#endif
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+#ifdef CONFIG_AUFS_FAKE_DM
+
+static int silly_lock(struct inode *inode, struct nameidata *nd)
+{
+ LKTRTrace("i%lu, nd %p\n", inode->i_ino, nd);
+
+ si_read_lock(inode->i_sb, AuLock_FLUSH);
+ ii_read_lock_child(inode);
+ return 0;
+}
+
+static void silly_unlock(int locked, struct inode *inode, struct nameidata *nd)
+{
+ LKTRTrace("locked %d, i%lu, nd %p\n", locked, inode->i_ino, nd);
+
+ ii_read_unlock(inode);
+ si_read_unlock(inode->i_sb);
+}
+
+#else
+
+static int silly_lock(struct inode *inode, struct nameidata *nd)
+{
+ int locked = 0;
+ struct super_block *sb = inode->i_sb;
+
+ LKTRTrace("i%lu, nd %p\n", inode->i_ino, nd);
+
+ if (!nd || !nd->path.dentry) {
+ si_read_lock(sb, AuLock_FLUSH);
+ ii_read_lock_child(inode);
+ } else if (nd->path.dentry->d_inode != inode) {
+ locked = 1;
+ /* lock child first, then parent */
+ si_read_lock(sb, AuLock_FLUSH);
+ ii_read_lock_child(inode);
+ di_read_lock_parent(nd->path.dentry, 0);
+ } else {
+ locked = 2;
+ aufs_read_lock(nd->path.dentry, AuLock_FLUSH | AuLock_IR);
+ }
+ return locked;
+}
+
+static void silly_unlock(int locked, struct inode *inode, struct nameidata *nd)
+{
+ struct super_block *sb = inode->i_sb;
+
+ LKTRTrace("locked %d, i%lu, nd %p\n", locked, inode->i_ino, nd);
+
+ switch (locked) {
+ case 0:
+ ii_read_unlock(inode);
+ si_read_unlock(sb);
+ break;
+ case 1:
+ di_read_unlock(nd->path.dentry, 0);
+ ii_read_unlock(inode);
+ si_read_unlock(sb);
+ break;
+ case 2:
+ aufs_read_unlock(nd->path.dentry, AuLock_FLUSH | AuLock_IR);
+ break;
+ default:
+ BUG();
+ }
+}
+
+#endif /* CONFIG_AUFS_FAKE_DM */
+
+static int aufs_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ int err, locked, dlgt;
+ aufs_bindex_t bindex, bend;
+ struct inode *h_inode;
+ struct super_block *sb;
+ unsigned int mnt_flags;
+ struct nameidata fake_nd, *p;
+ const int write_mask = (mask & (MAY_WRITE | MAY_APPEND));
+ const int nondir = !S_ISDIR(inode->i_mode);
+
+ LKTRTrace("ino %lu, mask 0x%x, nondir %d, write_mask %d, "
+ "nd %d{%d, %d}\n",
+ inode->i_ino, mask, nondir, write_mask,
+ !!nd, nd ? !!nd->path.dentry : 0, nd ? !!nd->path.mnt : 0);
+
+ sb = inode->i_sb;
+ locked = silly_lock(inode, nd);
+ mnt_flags = au_mntflags(sb);
+ dlgt = !!au_opt_test_dlgt(mnt_flags);
+
+ if (nd)
+ fake_nd = *nd;
+ if (/* unlikely */(nondir || write_mask
+ || au_opt_test_dirperm1(mnt_flags))) {
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ AuDebugOn(!h_inode
+ || ((h_inode->i_mode & S_IFMT)
+ != (inode->i_mode & S_IFMT)));
+ err = 0;
+ bindex = au_ibstart(inode);
+ p = au_fake_dm(&fake_nd, nd, sb, bindex);
+ /* actual test will be delegated to LSM */
+ if (IS_ERR(p))
+ AuDebugOn(PTR_ERR(p) != -ENOENT);
+ else {
+ LKTRTrace("b%d\n", bindex);
+ err = h_permission(h_inode, mask, p,
+ au_sbr_perm(sb, bindex), dlgt);
+ au_fake_dm_release(p);
+ }
+ if (write_mask && !err) {
+ /* test whether the upper writable branch exists */
+ err = -EROFS;
+ for (; bindex >= 0; bindex--)
+ if (!au_br_rdonly(au_sbr(sb, bindex))) {
+ err = 0;
+ break;
+ }
+ }
+ goto out;
+ }
+
+ /* non-write to dir */
+ err = 0;
+ bend = au_ibend(inode);
+ for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) {
+ h_inode = au_h_iptr(inode, bindex);
+ if (!h_inode)
+ continue;
+ AuDebugOn(!S_ISDIR(h_inode->i_mode));
+
+ p = au_fake_dm(&fake_nd, nd, sb, bindex);
+ /* actual test will be delegated to LSM */
+ if (IS_ERR(p))
+ AuDebugOn(PTR_ERR(p) != -ENOENT);
+ else {
+ LKTRTrace("b%d\n", bindex);
+ err = h_permission(h_inode, mask, p,
+ au_sbr_perm(sb, bindex), dlgt);
+ au_fake_dm_release(p);
+ }
+ }
+
+ out:
+ silly_unlock(locked, inode, nd);
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct dentry *ret, *parent;
+ int err, npositive;
+ struct inode *inode, *h_inode;
+ struct nameidata tmp_nd, *ndp;
+
+ LKTRTrace("dir %lu, %.*s, nd{0x%x}\n",
+ dir->i_ino, AuDLNPair(dentry), nd ? nd->flags : 0);
+ AuDebugOn(IS_ROOT(dentry));
+ IMustLock(dir);
+
+ /* nd can be NULL */
+ parent = dentry->d_parent; /* dir inode is locked */
+ aufs_read_lock(parent, AuLock_FLUSH);
+ err = au_alloc_dinfo(dentry);
+ //if (LktrCond) err = -1;
+ ret = ERR_PTR(err);
+ if (unlikely(err))
+ goto out;
+
+ ndp = au_dup_nd(au_sbi(dir->i_sb), &tmp_nd, nd);
+ npositive = au_lkup_dentry(dentry, au_dbstart(parent), /*type*/0, ndp);
+ err = npositive;
+ //err = -1;
+ ret = ERR_PTR(err);
+ if (unlikely(err < 0))
+ goto out_unlock;
+ inode = NULL;
+ if (npositive) {
+ /*
+ * stop 'race'-ing between hardlinks under different parents.
+ */
+ h_inode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode;
+ AuDebugOn(!h_inode);
+ if (h_inode->i_nlink == 1 || S_ISDIR(h_inode->i_mode))
+ inode = au_new_inode(dentry);
+ else {
+ static DEFINE_MUTEX(mtx);
+ mutex_lock(&mtx);
+ inode = au_new_inode(dentry);
+ mutex_unlock(&mtx);
+ }
+ ret = (void *)inode;
+ }
+ if (!IS_ERR(inode)) {
+#if 1
+ /* d_splice_alias() also supports d_add() */
+ ret = d_splice_alias(inode, dentry);
+ if (unlikely(IS_ERR(ret) && inode))
+ ii_write_unlock(inode);
+#else
+ d_add(dentry, inode);
+#endif
+ //AuDbgDentry(dentry);
+ AuDebugOn(nd
+ && (nd->flags & LOOKUP_OPEN)
+ && nd->intent.open.file
+ && nd->intent.open.file->f_dentry);
+ au_store_fmode_exec(nd, inode);
+ }
+
+ out_unlock:
+ di_write_unlock(dentry);
+ out:
+ aufs_read_unlock(parent, !AuLock_IR);
+ AuTraceErrPtr(ret);
+ return ret;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * decide the branch and the parent dir where we will create a new entry.
+ * returns new bindex or an error.
+ * copyup the parent dir if needed.
+ */
+int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry,
+ struct au_wr_dir_args *args)
+{
+ int err;
+ aufs_bindex_t bcpup, bstart, src_bstart;
+ struct super_block *sb;
+ struct dentry *parent, *src_parent;
+ struct au_sbinfo *sbinfo;
+ const int add_entry = au_ftest_wrdir(args->flags, ADD_ENTRY);
+ const int lock_srcdir = au_ftest_wrdir(args->flags, LOCK_SRCDIR);
+
+ LKTRTrace("%.*s, src %p, {%d, 0x%x}\n",
+ AuDLNPair(dentry), src_dentry, args->force_btgt, args->flags);
+ //AuDbgDentry(dentry);
+
+ src_parent = NULL;
+ sb = dentry->d_sb;
+ sbinfo = au_sbi(sb);
+ parent = dget_parent(dentry);
+ bstart = au_dbstart(dentry);
+ bcpup = bstart;
+ if (args->force_btgt < 0) {
+ if (src_dentry) {
+ src_bstart = au_dbstart(src_dentry);
+ if (src_bstart < bstart)
+ bcpup = src_bstart;
+ } else if (add_entry) {
+ err = AuWbrCreate(sbinfo, dentry,
+ au_ftest_wrdir(args->flags, ISDIR));
+ bcpup = err;
+ }
+
+ if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) {
+ if (add_entry)
+ err = AuWbrCopyup(sbinfo, dentry);
+ else {
+ di_read_lock_parent(parent, !AuLock_IR);
+ err = AuWbrCopyup(sbinfo, dentry);
+ di_read_unlock(parent, !AuLock_IR);
+ }
+ //err = -1;
+ bcpup = err;
+ if (unlikely(err < 0))
+ goto out;
+ }
+ } else {
+ bcpup = args->force_btgt;
+ AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode));
+ }
+ LKTRTrace("bstart %d, bcpup %d\n", bstart, bcpup);
+ if (bstart < bcpup)
+ au_update_dbrange(dentry, /*do_put_zero*/1);
+
+ err = bcpup;
+ if (bcpup == bstart)
+ goto out; /* success */
+
+ /* copyup the new parent into the branch we process */
+ if (src_dentry) {
+ src_parent = dget_parent(src_dentry);
+ if (lock_srcdir)
+ di_write_lock_parent2(src_parent);
+ }
+
+ if (add_entry) {
+ au_update_dbstart(dentry);
+ IMustLock(parent->d_inode);
+ DiMustWriteLock(parent);
+ IiMustWriteLock(parent->d_inode);
+ } else
+ di_write_lock_parent(parent);
+
+ err = 0;
+ if (!au_h_dptr(parent, bcpup)) {
+ if (bstart < bcpup)
+ err = au_cpdown_dirs(dentry, bcpup, src_parent);
+ else
+ err = au_cpup_dirs(dentry, bcpup, src_parent);
+ }
+ //err = -1;
+ if (!err && add_entry) {
+ struct dentry *h_parent;
+ struct inode *h_dir;
+
+ h_parent = au_h_dptr(parent, bcpup);
+ AuDebugOn(!h_parent);
+ h_dir = h_parent->d_inode;
+ AuDebugOn(!h_dir);
+ mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT);
+ err = au_lkup_neg(dentry, bcpup);
+ //err = -1;
+ mutex_unlock(&h_dir->i_mutex);
+ if (bstart < bcpup && au_dbstart(dentry) < 0) {
+ au_set_dbstart(dentry, 0);
+ au_update_dbrange(dentry, /*do_put_zero*/0);
+ }
+ }
+
+ if (!add_entry)
+ di_write_unlock(parent);
+ if (lock_srcdir)
+ di_write_unlock(src_parent);
+ dput(src_parent);
+ if (!err)
+ err = bcpup; /* success */
+ //err = -EPERM;
+ out:
+ dput(parent);
+ LKTRTrace("err %d\n", err);
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void au_hi_lock(struct inode *h_inode, int isdir, struct inode *inode,
+ aufs_bindex_t bindex)
+{
+ if (!isdir)
+ mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD);
+ else
+ au_hdir2_lock(h_inode, inode, bindex);
+}
+
+static void au_hi_unlock(struct inode *h_inode, int isdir, struct inode *inode,
+ aufs_bindex_t bindex)
+{
+ if (!isdir)
+ mutex_unlock(&h_inode->i_mutex);
+ else
+ au_hdir_unlock(h_inode, inode, bindex);
+}
+
+struct au_icpup_args {
+ aufs_bindex_t btgt;
+ unsigned char isdir, did_cpup; /* flags */
+ unsigned char hinotify;
+ struct dentry *parent, *gparent, *h_dentry;
+ struct inode *dir, *gdir, *h_inode, *h_dir;
+};
+
+static int au_lock_and_icpup(struct dentry *dentry, loff_t sz,
+ struct au_icpup_args *rargs)
+{
+ int err;
+ aufs_bindex_t bstart;
+ struct super_block *sb;
+ struct dentry *hi_wh;
+ struct inode *inode;
+ struct au_wr_dir_args wr_dir_args = {
+ .force_btgt = -1,
+ .flags = 0
+ };
+
+ LKTRTrace("%.*s, %lld\n", AuDLNPair(dentry), sz);
+
+ di_write_lock_child(dentry);
+ bstart = au_dbstart(dentry);
+ sb = dentry->d_sb;
+ inode = dentry->d_inode;
+ rargs->isdir = S_ISDIR(inode->i_mode);
+ if (rargs->isdir)
+ au_fset_wrdir(wr_dir_args.flags, ISDIR);
+ err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args);
+ //err = -1;
+ if (unlikely(err < 0))
+ goto out_dentry;
+ rargs->btgt = err;
+ rargs->did_cpup = (err != bstart);
+ err = 0;
+
+ /* crazy udba locks */
+ rargs->hinotify = !!au_opt_test(au_mntflags(sb), UDBA_INOTIFY);
+ if (unlikely(!IS_ROOT(dentry))) {
+ rargs->parent = dget_parent(dentry);
+ rargs->dir = rargs->parent->d_inode;
+ di_read_lock_parent(rargs->parent, AuLock_IR);
+ }
+ rargs->h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
+ rargs->h_inode = rargs->h_dentry->d_inode;
+ AuDebugOn(!rargs->h_inode);
+
+ if (!rargs->did_cpup) {
+ au_hi_lock(rargs->h_inode, rargs->isdir, inode, rargs->btgt);
+ //todo: revalidate the lower dentry?
+ goto out; /* success */
+ }
+
+ if (unlikely(rargs->hinotify
+ && rargs->parent
+ && !IS_ROOT(rargs->parent))) {
+ rargs->gparent = dget_parent(rargs->parent);
+ rargs->gdir = rargs->gparent->d_inode;
+ ii_read_lock_parent2(rargs->gdir);
+ }
+
+ hi_wh = NULL;
+ rargs->h_dir = au_h_iptr(rargs->dir, rargs->btgt);
+ au_hdir_lock(rargs->h_dir, rargs->dir, rargs->btgt);
+ //todo: revalidate the lower dentry?
+ au_hi_lock(rargs->h_inode, rargs->isdir, inode, bstart);
+ if (!d_unhashed(dentry)) {
+ err = au_sio_cpup_simple(dentry, rargs->btgt, sz, AuCpup_DTIME);
+ if (!err)
+ rargs->h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
+ } else {
+ hi_wh = au_hi_wh(inode, rargs->btgt);
+ if (!hi_wh) {
+ err = au_sio_cpup_wh(dentry, rargs->btgt, sz,
+ /*file*/NULL);
+ if (!err)
+ hi_wh = au_hi_wh(inode, rargs->btgt);
+#if 0
+ revalidate hi_wh;
+#endif
+ }
+ if (!hi_wh)
+ rargs->h_dentry = au_h_dptr(dentry, au_dbstart(dentry));
+ else
+ rargs->h_dentry = hi_wh; /* do not dget here */
+ }
+
+ //err = -1;
+ au_hi_unlock(rargs->h_inode, rargs->isdir, inode, bstart);
+ rargs->h_inode = rargs->h_dentry->d_inode;
+ AuDebugOn(!rargs->h_inode);
+ if (!err)
+ au_hi_lock(rargs->h_inode, rargs->isdir, inode, rargs->btgt);
+ au_hdir_unlock(rargs->h_dir, rargs->dir, rargs->btgt);
+ if (!err)
+ goto out; /* success */
+
+ au_hi_unlock(rargs->h_inode, rargs->isdir, inode, rargs->btgt);
+ if (unlikely(rargs->gdir)) {
+ ii_read_unlock(rargs->gdir);
+ dput(rargs->gparent);
+ }
+ if (unlikely(rargs->dir)) {
+ di_read_unlock(rargs->parent, AuLock_IR);
+ dput(rargs->parent);
+ }
+
+ out_dentry:
+ di_write_unlock(dentry);
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+#if 0 //LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
+static long aufs_fallocate(struct inode *inode, int mode, loff_t offset,
+ loff_t len)
+{
+ long err;
+ struct super_block *sb;
+ struct dentry *dentry;
+ struct au_icpup_args rargs;
+
+ LKTRTrace("i%lu, 0x%x, %lld, %lld\n", inode->i_ino, mode, offset, len);
+
+ sb = inode->i_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+#if 0
+ /* currently there are few filesystems to support fallocate(2) */
+ err = -EOPNOTSUPP;
+ goto out;
+#endif
+
+ /*
+ * if it is not the target dentry, it does no harm since fallocate(2)
+ * works on the inode.
+ */
+ dentry = d_find_alias(inode);
+ if (unlikely(!dentry)) {
+ AuIOErr("no dentry for i%lu\n", inode->i_ino);
+ err = -EIO;
+ goto out;
+ }
+
+ memset(&rargs, 0, sizeof(rargs));
+ err = au_lock_and_icpup(dentry, -1, &rargs);
+ if (unlikely(err < 0))
+ goto out;
+
+ err = -EOPNOTSUPP;
+ if (rargs.h_inode->i_op && rargs.h_inode->i_op->fallocate)
+ err = rargs.h_inode->i_op->fallocate(rargs.h_inode, mode,
+ offset, len);
+
+ au_hi_unlock(rargs.h_inode, rargs.isdir, inode, rargs.btgt);
+ if (unlikely(rargs.gdir)) {
+ ii_read_unlock(rargs.gdir);
+ dput(rargs.gparent);
+ }
+ if (unlikely(rargs.dir)) {
+ di_read_unlock(rargs.parent, AuLock_IR);
+ dput(rargs.parent);
+ }
+ di_write_unlock(dentry);
+
+ out:
+ si_read_unlock(sb);
+ AuTraceErr(err);
+ return err;
+}
+#endif
+
+static int aufs_setattr(struct dentry *dentry, struct iattr *ia)
+{
+ int err;
+ struct inode *inode;
+ struct au_hin_ignore ign;
+ struct vfsub_args vargs;
+ struct super_block *sb;
+ __u32 events;
+ struct file *file;
+ loff_t sz;
+ struct au_icpup_args rargs;
+
+ LKTRTrace("%.*s, ia_valid 0x%x\n", AuDLNPair(dentry), ia->ia_valid);
+ inode = dentry->d_inode;
+ IMustLock(inode);
+
+ sb = dentry->d_sb;
+ si_read_lock(sb, AuLock_FLUSH);
+
+ file = NULL;
+ if (ia->ia_valid & ATTR_FILE) {
+ /* currently ftruncate(2) only */
+ file = ia->ia_file;
+ fi_write_lock(file);
+ ia->ia_file = au_h_fptr(file, au_fbstart(file));
+ }
+
+ sz = -1;
+ if ((ia->ia_valid & ATTR_SIZE)
+ && ia->ia_size < i_size_read(inode))
+ sz = ia->ia_size;
+ memset(&rargs, 0, sizeof(rargs));
+ err = au_lock_and_icpup(dentry, sz, &rargs);
+ if (unlikely(err < 0))
+ goto out;
+
+ if ((ia->ia_valid & ATTR_SIZE)
+ && ia->ia_size < i_size_read(inode)) {
+ err = vmtruncate(inode, ia->ia_size);
+ if (unlikely(err))
+ goto out_unlock;
+ }
+
+ if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+ ia->ia_valid &= ~ATTR_MODE;
+
+ events = 0;
+ vfsub_args_init(&vargs, &ign, au_opt_test_dlgt(au_mntflags(sb)), 0);
+ if (unlikely(rargs.hinotify && rargs.dir)) {
+ events = vfsub_events_notify_change(ia);
+ if (events)
+ vfsub_ign_hinode(&vargs, events,
+ au_hi(rargs.dir, rargs.btgt));
+ }
+ err = vfsub_notify_change(rargs.h_dentry, ia, &vargs);
+ //err = -1;
+ if (!err)
+ au_cpup_attr_changeable(inode);
+
+ out_unlock:
+ au_hi_unlock(rargs.h_inode, rargs.isdir, inode, rargs.btgt);
+ if (unlikely(rargs.gdir)) {
+ ii_read_unlock(rargs.gdir);
+ dput(rargs.gparent);
+ }
+ if (unlikely(rargs.dir)) {
+ di_read_unlock(rargs.parent, AuLock_IR);
+ dput(rargs.parent);
+ }
+ di_write_unlock(dentry);
+ out:
+ if (file) {
+ ia->ia_file = file;
+ //ia->ia_valid |= ATTR_FILE;
+ fi_write_unlock(file);
+ }
+ si_read_unlock(sb);
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int h_readlink(struct dentry *dentry, int bindex, char __user *buf,
+ int bufsiz)
+{
+ struct super_block *sb;
+ struct dentry *h_dentry;
+
+ LKTRTrace("%.*s, b%d, %d\n", AuDLNPair(dentry), bindex, bufsiz);
+
+ h_dentry = au_h_dptr(dentry, bindex);
+ if (unlikely(!h_dentry->d_inode->i_op
+ || !h_dentry->d_inode->i_op->readlink))
+ return -EINVAL;
+
+ sb = dentry->d_sb;
+ if (!au_test_ro(sb, bindex, dentry->d_inode)) {
+ touch_atime(au_sbr_mnt(sb, bindex), h_dentry);
+ au_update_fuse_h_inode(NULL, h_dentry); /*ignore*/
+ fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode);
+ }
+ return h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz);
+}
+
+static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+{
+ int err;
+
+ LKTRTrace("%.*s, %d\n", AuDLNPair(dentry), bufsiz);
+
+ aufs_read_lock(dentry, AuLock_IR);
+ err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz);
+ //err = -1;
+ aufs_read_unlock(dentry, AuLock_IR);
+ AuTraceErr(err);
+ return err;
+}
+
+static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ int err;
+ char *buf;
+ mm_segment_t old_fs;
+
+ LKTRTrace("%.*s, nd %.*s\n",
+ AuDLNPair(dentry), AuDLNPair(nd->path.dentry));
+
+ err = -ENOMEM;
+ buf = __getname();
+ //buf = NULL;
+ if (unlikely(!buf))
+ goto out;
+
+ aufs_read_lock(dentry, AuLock_IR);
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ err = h_readlink(dentry, au_dbstart(dentry), (char __user *)buf,
+ PATH_MAX);
+ //err = -1;
+ set_fs(old_fs);
+ aufs_read_unlock(dentry, AuLock_IR);
+
+ if (err >= 0) {
+ buf[err] = 0;
+ /* will be freed by put_link */
+ nd_set_link(nd, buf);
+ return NULL; /* success */
+ }
+ __putname(buf);
+
+ out:
+ path_put(&nd->path);
+ AuTraceErr(err);
+ return ERR_PTR(err);
+}
+
+static void aufs_put_link(struct dentry *dentry, struct nameidata *nd,
+ void *cookie)
+{
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+ __putname(nd_get_link(nd));
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void aufs_truncate_range(struct inode *inode, loff_t start, loff_t end)
+{
+ AuUnsupport();
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct inode_operations aufs_symlink_iop = {
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+ .getattr = aufs_getattr,
+#endif
+
+ .readlink = aufs_readlink,
+ .follow_link = aufs_follow_link,
+ .put_link = aufs_put_link
+};
+
+struct inode_operations aufs_dir_iop = {
+ .create = aufs_create,
+ .lookup = aufs_lookup,
+ .link = aufs_link,
+ .unlink = aufs_unlink,
+ .symlink = aufs_symlink,
+ .mkdir = aufs_mkdir,
+ .rmdir = aufs_rmdir,
+ .mknod = aufs_mknod,
+ .rename = aufs_rename,
+
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+ .getattr = aufs_getattr,
+#endif
+
+#if 0 // xattr
+ .setxattr = aufs_setxattr,
+ .getxattr = aufs_getxattr,
+ .listxattr = aufs_listxattr,
+ .removexattr = aufs_removexattr,
+#endif
+
+#if 0 //LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
+ .fallocate = aufs_fallocate
+#endif
+};
+
+struct inode_operations aufs_iop = {
+ .permission = aufs_permission,
+ .setattr = aufs_setattr,
+#ifdef CONFIG_AUFS_WORKAROUND_FUSE
+ .getattr = aufs_getattr,
+#endif
+
+#if 0 // xattr
+ .setxattr = aufs_setxattr,
+ .getxattr = aufs_getxattr,
+ .listxattr = aufs_listxattr,
+ .removexattr = aufs_removexattr,
+#endif
+
+ //void (*truncate) (struct inode *);
+ .truncate_range = aufs_truncate_range,
+
+#if 0 //LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23)
+ .fallocate = aufs_fallocate
+#endif
+};
--
1.4.4.4
--
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