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Message-Id: <1211340189-11813-9-git-send-email-hooanon05@yahoo.co.jp>
Date: Wed, 21 May 2008 12:22:38 +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: [AUFS PATCH v2.6.26-rc2-mm1 08/39] aufs branch filesystem type specific
From: Junjiro Okajima <hooanon05@...oo.co.jp>
initial commit
br_fuse.c special handling for inode attributes on FUSE branch
br_nfs.c lookup functions for NFS branch
br_xfs.c special handling inode attributes on XFS branch
Signed-off-by: Junjiro Okajima <hooanon05@...oo.co.jp>
---
fs/aufs/br_fuse.c | 107 ++++++++++++++++
fs/aufs/br_nfs.c | 347 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/br_xfs.c | 67 ++++++++++
3 files changed, 521 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/br_fuse.c
create mode 100644 fs/aufs/br_nfs.c
create mode 100644 fs/aufs/br_xfs.c
diff --git a/fs/aufs/br_fuse.c b/fs/aufs/br_fuse.c
new file mode 100644
index 0000000..1c0182b
--- /dev/null
+++ b/fs/aufs/br_fuse.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 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
+ */
+
+/*
+ * special handling for inode attributes on FUSE branch
+ */
+
+#include "aufs.h"
+
+/* h_mnt can be NULL, is it safe? */
+int au_update_fuse_h_inode(struct vfsmount *h_mnt, struct dentry *h_dentry)
+{
+ int err;
+ struct kstat st;
+
+ LKTRTrace("%.*s\n", AuDLNPair(h_dentry));
+
+ err = 0;
+ if (unlikely(h_dentry->d_inode
+ /* && atomic_read(&h_dentry->d_inode->i_count) */
+ && au_test_fuse(h_dentry->d_sb))) {
+ err = vfsub_getattr(h_mnt, h_dentry, &st, /*dlgt*/0);
+ if (unlikely(err)) {
+ AuDbg("err %d\n", err);
+ au_debug_on();
+ AuDbgDentry(h_dentry);
+ au_debug_off();
+ WARN_ON(err);
+ }
+ }
+ return err;
+}
+
+/* currently, for fuse only */
+int aufs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *st)
+{
+ int err;
+ struct inode *inode, *h_inode;
+ struct dentry *h_dentry;
+
+ LKTRTrace("%.*s\n", AuDLNPair(dentry));
+
+ err = 0;
+ aufs_read_lock(dentry, AuLock_IR);
+ inode = dentry->d_inode;
+ h_inode = au_h_iptr(inode, au_ibstart(inode));
+ if (unlikely(au_test_fuse(h_inode->i_sb))) {
+ h_dentry = d_find_alias(h_inode);
+ /* simply gave up updating fuse inode */
+ if (h_dentry) {
+ /*ignore*/
+ if (!au_update_fuse_h_inode(NULL, h_dentry))
+ au_cpup_attr_all(inode);
+ dput(h_dentry);
+ }
+ }
+ generic_fillattr(inode, st);
+
+ aufs_read_unlock(dentry, AuLock_IR);
+ return err;
+}
+
+#if 0 /* temp */
+/*
+ * This function was born after a discussion with the FUSE developer.
+ * The inode attributes on a filesystem who defines i_op->getattr()
+ * is unreliable since such fs may not maintain the attributes at lookup.
+ * This function doesn't want the result of stat, instead wants the side-effect
+ * which refreshes the attributes.
+ * Hmm, there seems to be no such filesystem except fuse.
+ */
+int vfsub_i_attr(struct vfsmount *mnt, struct dentry *dentry, int dlgt)
+{
+ int err;
+ struct inode *inode;
+ struct inode_operations *op;
+ struct kstat st;
+
+ inode = dentry->d_inode;
+ AuDebugOn(!inode);
+
+ err = 0;
+ op = inode->i_op;
+ if (unlikely(op && op->getattr && !au_test_aufs(dentry->d_sb))) {
+ err = security_inode_getattr(mnt, dentry);
+ if (!err)
+ err = op->getattr(mnt, dentry, &st);
+ }
+ AuTraceErr(err);
+ return err;
+}
+#endif
diff --git a/fs/aufs/br_nfs.c b/fs/aufs/br_nfs.c
new file mode 100644
index 0000000..7fe71a8
--- /dev/null
+++ b/fs/aufs/br_nfs.c
@@ -0,0 +1,347 @@
+/*
+ * Copyright (C) 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
+ */
+
+/*
+ * lookup functions for NFS branch in linux-2.6.19 and later
+ */
+
+#include "aufs.h"
+
+static struct file *au_find_h_intent(struct au_hdentry *hd, struct file *file)
+{
+ struct file *h_file, *hf;
+ struct au_hdintent *hdi, *tmp, *do_free;
+
+ LKTRTrace("%.*s\n", AuDLNPair(hd->hd_dentry));
+
+ h_file = NULL;
+ do_free = NULL;
+ spin_lock(&hd->hd_lock);
+ list_for_each_entry_safe(hdi, tmp, hd->hd_intent_list, hdi_list) {
+ hf = hdi->hdi_file[AuIntent_BRANCH];
+ if (hdi->hdi_file[AuIntent_AUFS] == file
+ && hf->f_dentry == hd->hd_dentry) {
+ h_file = hf;
+ do_free = hdi;
+ list_del(&hdi->hdi_list);
+ break;
+ }
+ }
+ spin_unlock(&hd->hd_lock);
+ kfree(do_free);
+
+ return h_file;
+}
+
+struct file *au_h_intent(struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *file)
+{
+ struct file *h_file;
+ struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
+
+ LKTRTrace("%.*s, b%d, f %p\n", AuDLNPair(dentry), bindex, file);
+ DiMustAnyLock(dentry);
+ AuDebugOn(bindex < au_di(dentry)->di_bstart
+ || bindex > au_di(dentry)->di_bend);
+
+ h_file = NULL;
+ if (!hd->hd_intent_list || !file)
+ return h_file; /* success */
+
+ /* AuDebugOn(au_test_wkq(current)); */
+ h_file = au_find_h_intent(hd, file);
+ return h_file;
+}
+
+static int au_set_h_intent(struct dentry *dentry, aufs_bindex_t bindex,
+ struct file *file, struct file *h_file)
+{
+ int err;
+ struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex;
+ struct au_hdintent *hdi;
+ struct file *hf;
+
+ LKTRTrace("%.*s, b%d, f %p\n", AuDLNPair(dentry), bindex, file);
+ /* d_revalidate() holds read_lock */
+ /* DiMustWriteLock(dentry); */
+ AuDebugOn(bindex < au_di(dentry)->di_bstart
+ || bindex > au_di(dentry)->di_bend
+ || !file
+ || !h_file
+ /* || au_test_wkq(current) */);
+
+ err = -ENOMEM;
+ if (hd->hd_intent_list) {
+ while (1) {
+ hf = au_find_h_intent(hd, file);
+ if (!hf)
+ break;
+ fput(hf);
+ AuWarn("freed hfile %.*s b%d left\n",
+ AuDLNPair(dentry), bindex);
+ }
+ } else {
+ spin_lock(&hd->hd_lock);
+ if (!hd->hd_intent_list) {
+ hd->hd_intent_list
+ = kmalloc(sizeof(*hd->hd_intent_list),
+ GFP_ATOMIC);
+ if (unlikely(!hd->hd_intent_list)) {
+ spin_unlock(&hd->hd_lock);
+ goto out;
+ }
+ INIT_LIST_HEAD(hd->hd_intent_list);
+ }
+ spin_unlock(&hd->hd_lock);
+ }
+
+ hdi = kmalloc(sizeof(*hdi), GFP_TEMPORARY);
+ if (unlikely(!hdi))
+ goto out;
+
+ err = 0;
+ /* hdi->hdi_pid = current->pid; */
+ hdi->hdi_file[AuIntent_AUFS] = file;
+ hdi->hdi_file[AuIntent_BRANCH] = h_file;
+ spin_lock(&hd->hd_lock);
+ list_add(&hdi->hdi_list, hd->hd_intent_list);
+ spin_unlock(&hd->hd_lock);
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_br_nfs_h_intent(struct file *nd_file, struct dentry *dentry,
+ aufs_bindex_t bindex, struct nameidata *nd)
+{
+ int err;
+
+ AuTraceEnter();
+
+ err = 0;
+ if (!nd_file)
+ goto out;
+
+ AuDebugOn(!nd);
+ err = au_set_h_intent(dentry, bindex, nd->intent.open.file, nd_file);
+ if (unlikely(err)) {
+ fput(nd_file);
+ au_set_h_dptr(dentry, bindex, NULL);
+ /* todo: update bstart and bend? */
+ }
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+void au_hintent_put(struct au_hdentry *hd, int do_free)
+{
+ struct au_hdintent *hdi, *tmp;
+ struct file *hf;
+
+ if (unlikely(hd->hd_intent_list)) {
+ /* no spin lock */
+ list_for_each_entry_safe(hdi, tmp, hd->hd_intent_list,
+ hdi_list) {
+ LKTRTrace("hdi %p\n", hdi);
+ hf = hdi->hdi_file[AuIntent_BRANCH];
+ if (unlikely(hf))
+ fput(hf);
+ /* list_del(&hdi->hdi_list); */
+ kfree(hdi);
+ }
+ if (do_free)
+ kfree(hd->hd_intent_list);
+ }
+}
+
+/* ---------------------------------------------------------------------- */
+
+int au_fake_intent(/* struct au_ndsub *save, */struct nameidata *nd,
+ int perm)
+{
+ int err;
+
+ LKTRTrace("perm %d\n", perm);
+
+ err = 0;
+ nd->intent.open.file = NULL;
+ if (nd->flags & LOOKUP_OPEN) {
+ err = -ENFILE;
+ nd->intent.open.file = get_empty_filp();
+ if (unlikely(!nd->intent.open.file))
+ goto out;
+
+ err = 0;
+ if (!au_br_writable(perm)) {
+ nd->intent.open.flags = FMODE_READ
+ | au_file_roflags(nd->intent.open.flags);
+ nd->flags &= ~LOOKUP_CREATE;
+ }
+ }
+
+ out:
+ AuTraceErr(err);
+ return err;
+}
+
+int au_hin_after_reval(struct nameidata *nd, struct dentry *dentry,
+ aufs_bindex_t bindex, struct file *file)
+{
+ int err;
+
+ LKTRTrace("nd %p, %.*s, b%d, f %d\n",
+ nd, AuDLNPair(dentry), bindex, !!file);
+
+ err = 0;
+ if ((nd->flags & LOOKUP_OPEN)
+ && nd->intent.open.file
+ && !IS_ERR(nd->intent.open.file)) {
+ if (nd->intent.open.file->f_dentry) {
+ err = au_set_h_intent(dentry, bindex, file,
+ nd->intent.open.file);
+ if (!err)
+ nd->intent.open.file = NULL;
+ }
+ if (unlikely(nd->intent.open.file))
+ put_filp(nd->intent.open.file);
+ }
+
+ return err;
+}
+
+#ifdef CONFIG_AUFS_DLGT
+struct au_lookup_hash_args {
+ struct dentry **errp;
+ struct qstr *name;
+ struct dentry *base;
+ struct nameidata *nd;
+};
+
+static void au_call_lookup_hash(void *args)
+{
+ struct au_lookup_hash_args *a = args;
+ *a->errp = vfsub__lookup_hash(a->name, a->base, a->nd);
+}
+
+static struct dentry *
+au_lkup_hash_dlgt(struct qstr *this, struct dentry *parent,
+ struct nameidata *nd, unsigned int flags)
+{
+ struct dentry *dentry;
+ int dirperm1;
+
+ dirperm1 = au_ftest_ndx(flags, DIRPERM1);
+ if (!dirperm1 && !au_ftest_ndx(flags, DLGT))
+ dentry = vfsub__lookup_hash(this, parent, nd);
+ else {
+ int wkq_err;
+ struct au_lookup_hash_args args = {
+ .errp = &dentry,
+ .name = this,
+ .base = parent,
+ .nd = nd
+ };
+ wkq_err = au_wkq_wait(au_call_lookup_hash, &args,
+ /*dlgt*/!dirperm1);
+ if (unlikely(wkq_err))
+ dentry = ERR_PTR(wkq_err);
+ }
+
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
+#else
+static struct dentry *
+au_lkup_hash_dlgt(struct qstr *this, struct dentry *parent,
+ struct nameidata *nd, unsigned int flags)
+{
+ return vfsub__lookup_hash(this, parent, nd);
+}
+#endif /* CONFIG_AUFS_DLGT */
+
+struct dentry *au_lkup_hash(const char *name, struct dentry *parent,
+ int len, struct au_ndx *ndx)
+{
+ struct dentry *dentry;
+ char *p;
+ unsigned long hash;
+ struct qstr this;
+ unsigned int c;
+ struct nameidata tmp_nd, *ndo;
+ int err;
+
+ LKTRTrace("%.*s/%.*s\n", AuDLNPair(parent), len, name);
+
+ /* todo: export and call __lookup_one_len() in fs/namei.c? */
+ dentry = ERR_PTR(-EACCES);
+ this.name = name;
+ this.len = len;
+ if (unlikely(!len))
+ goto out;
+
+ p = (void *)name;
+ hash = init_name_hash();
+ while (len--) {
+ c = *p++;
+ if (unlikely(c == '/' || c == '\0'))
+ goto out;
+ hash = partial_name_hash(c, hash);
+ }
+ this.hash = end_name_hash(hash);
+
+ ndo = ndx->nd;
+ if (ndo) {
+ tmp_nd = *ndo;
+ err = au_fake_intent(&tmp_nd, ndx->br->br_perm);
+ dentry = ERR_PTR(err);
+ if (unlikely(err))
+ goto out_intent;
+ } else
+ memset(&tmp_nd, 0, sizeof(tmp_nd));
+
+ tmp_nd.path.dentry = parent;
+ tmp_nd.path.mnt = ndx->nfsmnt;
+ path_get(&tmp_nd.path);
+ dentry = au_lkup_hash_dlgt(&this, parent, &tmp_nd, ndx->flags);
+ if (0 && !IS_ERR(dentry))
+ AuDbgDentry(dentry);
+ if (!IS_ERR(dentry)) {
+ /* why negative dentry for a new dir was unhashed? */
+ if (unlikely(d_unhashed(dentry)))
+ d_rehash(dentry);
+ if (tmp_nd.intent.open.file
+ && tmp_nd.intent.open.file->f_dentry) {
+ ndx->nd_file = tmp_nd.intent.open.file;
+ tmp_nd.intent.open.file = NULL;
+ /* au_br_get(ndx->br); */
+ }
+ }
+ path_put(&tmp_nd.path);
+
+ out_intent:
+ if (tmp_nd.intent.open.file)
+ put_filp(tmp_nd.intent.open.file);
+ out:
+ AuTraceErrPtr(dentry);
+ return dentry;
+}
diff --git a/fs/aufs/br_xfs.c b/fs/aufs/br_xfs.c
new file mode 100644
index 0000000..2a3ef5f
--- /dev/null
+++ b/fs/aufs/br_xfs.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 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
+ */
+
+/*
+ * special handling inode attributes on XFS branch in linux-2.6.24 and later
+ */
+
+#include "aufs.h"
+
+/* h_mnt can be NULL, is it safe? */
+dev_t au_h_rdev(struct inode *h_inode, struct vfsmount *h_mnt,
+ struct dentry *h_dentry)
+{
+ dev_t rdev;
+ int err;
+ struct kstat st;
+
+ LKTRTrace("hi%lu\n", h_inode->i_ino);
+ if (h_dentry)
+ LKTRTrace("%.*s\n", AuDLNPair(h_dentry));
+
+ rdev = h_inode->i_rdev;
+ if (!rdev || !au_test_xfs(h_inode->i_sb))
+ goto out;
+
+ rdev = 0;
+ if (!h_dentry) {
+ err = 0;
+ h_dentry = d_find_alias(h_inode);
+ if (unlikely(!h_dentry))
+ goto failure;
+ err = PTR_ERR(h_dentry);
+ if (IS_ERR(h_dentry)) {
+ h_dentry = NULL;
+ goto failure;
+ }
+ LKTRTrace("%.*s\n", AuDLNPair(h_dentry));
+ } else
+ dget(h_dentry);
+
+ err = vfsub_getattr(h_mnt, h_dentry, &st, /*dlgt*/0);
+ dput(h_dentry);
+ if (!err) {
+ rdev = st.rdev;
+ goto out; /* success */
+ }
+
+ failure:
+ AuIOErr("failed rdev for XFS inode, hi%lu, %d\n", h_inode->i_ino, err);
+ out:
+ return rdev;
+}
--
1.5.5.1.308.g1fbb5.dirty
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