- Documentation/filesystems/ext2.txt | 16 ++
fs/ext3/inode.c | 3
fs/ext3/iopen.c | 239 +++++++++++++++++++++++++++++++++++++
fs/ext3/iopen.h | 15 ++
include/linux/ext3_fs.h | 2
7 files changed, 304 insertions(+), 1 deletion(-)
-Index: linux-2.6.4-51.1/fs/ext3/inode.c
+Index: linux-stage/fs/ext3/Makefile
===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/inode.c 2004-04-06 00:31:14.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/inode.c 2004-04-06 00:31:24.000000000 -0400
+--- linux-stage.orig/fs/ext3/Makefile 2004-05-07 16:00:16.000000000 -0400
++++ linux-stage/fs/ext3/Makefile 2004-05-07 16:00:17.000000000 -0400
+@@ -4,7 +4,7 @@
+
+ obj-$(CONFIG_EXT3_FS) += ext3.o
+
+-ext3-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
++ext3-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o iopen.o \
+ ioctl.o namei.o super.o symlink.o hash.o
+
+ ext3-$(CONFIG_EXT3_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
+Index: linux-stage/fs/ext3/inode.c
+===================================================================
+--- linux-stage.orig/fs/ext3/inode.c 2004-05-07 16:00:16.000000000 -0400
++++ linux-stage/fs/ext3/inode.c 2004-05-07 17:21:59.000000000 -0400
@@ -37,6 +37,7 @@
#include <linux/mpage.h>
#include <linux/uio.h>
#include "acl.h"
/*
-@@ -2472,6 +2473,8 @@
+@@ -2472,6 +2473,9 @@
ei->i_acl = EXT3_ACL_NOT_CACHED;
ei->i_default_acl = EXT3_ACL_NOT_CACHED;
#endif
+ if (ext3_iopen_get_inode(inode))
+ return;
++
if (ext3_get_inode_loc(inode, &iloc, 0))
goto bad_inode;
bh = iloc.bh;
-Index: linux-2.6.4-51.1/fs/ext3/iopen.c
+Index: linux-stage/fs/ext3/iopen.c
===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/iopen.c 2004-04-06 00:31:24.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/iopen.c 2004-04-06 00:31:24.000000000 -0400
-@@ -0,0 +1,223 @@
-+
-+
+--- linux-stage.orig/fs/ext3/iopen.c 2004-05-07 16:00:17.000000000 -0400
++++ linux-stage/fs/ext3/iopen.c 2004-05-07 17:22:37.000000000 -0400
+@@ -0,0 +1,272 @@
+/*
+ * linux/fs/ext3/iopen.c
+ *
+ *
+ * This file may be redistributed under the terms of the GNU General
+ * Public License.
++ *
++ *
++ * Invariants:
++ * - there is only ever a single DCACHE_NFSD_DISCONNECTED dentry alias
++ * for an inode at one time.
++ * - there are never both connected and DCACHE_NFSD_DISCONNECTED dentry
++ * aliases on an inode at the same time.
++ *
++ * If we have any connected dentry aliases for an inode, use one of those
++ * in iopen_lookup(). Otherwise, we instantiate a single NFSD_DISCONNECTED
++ * dentry for this inode, which thereafter will be found by the dcache
++ * when looking up this inode number in __iopen__, so we don't return here
++ * until it is gone.
++ *
++ * If we get an inode via a regular name lookup, then we "rename" the
++ * NFSD_DISCONNECTED dentry to the proper name and parent. This ensures
++ * existing users of the disconnected dentry will continue to use the same
++ * dentry as the connected users, and there will never be both kinds of
++ * dentry aliases at one time.
+ */
+
+#include <linux/sched.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/smp_lock.h>
++#include <linux/dcache.h>
++#include <linux/security.h>
+#include "iopen.h"
+
+#ifndef assert
+/*
+ * This implements looking up an inode by number.
+ */
-+static struct dentry *iopen_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
++static struct dentry *iopen_lookup(struct inode * dir, struct dentry *dentry,
++ struct nameidata *nd)
+{
-+ struct inode * inode;
++ struct inode *inode;
+ unsigned long ino;
+ struct list_head *lp;
+ struct dentry *alternate;
+ char buf[IOPEN_NAME_LEN];
-+
++
+ if (dentry->d_name.len >= IOPEN_NAME_LEN)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ return ERR_PTR(-ENOENT);
+ }
+
++ assert(list_empty(&dentry->d_alias)); /* d_instantiate */
++ assert(d_unhashed(dentry)); /* d_rehash */
++
+ /* preferrably return a connected dentry */
+ spin_lock(&dcache_lock);
+ list_for_each(lp, &inode->i_dentry) {
+ return alternate;
+ }
+ dentry->d_flags |= DCACHE_DISCONNECTED;
++
++ /* d_add(), but don't drop dcache_lock before adding dentry to inode */
++ list_add(&dentry->d_alias, &inode->i_dentry); /* d_instantiate */
++ dentry->d_inode = inode;
++
++ __d_rehash(dentry, 0); /* d_rehash */
+ spin_unlock(&dcache_lock);
+
-+ d_add(dentry, inode);
+ return NULL;
+}
+
+ __typeof__ (x) __tmp = x; \
+ x = y; y = __tmp; } while (0)
+
-+static inline void switch_names(struct dentry * dentry, struct dentry * target)
++static inline void switch_names(struct dentry *dentry, struct dentry *target)
+{
+ const unsigned char *old_name, *new_name;
+
+ dentry->d_name.name = old_name;
+}
+
-+
-+struct dentry *iopen_connect_dentry(struct dentry *de, struct inode *inode)
++/* This function is spliced into ext3_lookup and does the move of a
++ * disconnected dentry (if it exists) to a connected dentry.
++ */
++struct dentry *iopen_connect_dentry(struct dentry *dentry, struct inode *inode,
++ int rehash)
+{
+ struct dentry *tmp, *goal = NULL;
+ struct list_head *lp;
+
-+ /* preferrably return a connected dentry */
-+ spin_lock(&dcache_lock);
+ /* verify this dentry is really new */
-+ assert(!de->d_inode);
-+ assert(list_empty(&de->d_subdirs));
-+ assert(list_empty(&de->d_alias));
++ assert(dentry->d_inode == NULL);
++ assert(list_empty(&dentry->d_alias)); /* d_instantiate */
++ if (rehash)
++ assert(d_unhashed(dentry)); /* d_rehash */
++ assert(list_empty(&dentry->d_subdirs));
+
++ spin_lock(&dcache_lock);
++ if (!inode)
++ goto do_rehash;
+
++ /* preferrably return a connected dentry */
+ list_for_each(lp, &inode->i_dentry) {
+ tmp = list_entry(lp, struct dentry, d_alias);
+ if (tmp->d_flags & DCACHE_DISCONNECTED) {
+ break;
+ }
+ }
-+ spin_unlock(&dcache_lock);
+
+ if (!goal)
-+ return NULL;
++ goto do_instantiate;
+
-+ goal->d_flags &= ~DCACHE_DISCONNECTED;
-+ d_rehash(de);
-+ d_move(goal, de);
++ /* Move the goal to the de hash queue */
++ goal->d_flags &= ~ DCACHE_DISCONNECTED;
++ security_d_instantiate(goal, inode);
++ __d_rehash(dentry, 0);
++ __d_move(goal, dentry);
++ spin_unlock(&dcache_lock);
++ iput(inode);
+
+ return goal;
++
++ /* d_add(), but don't drop dcache_lock before adding dentry to inode */
++do_instantiate:
++ list_add(&dentry->d_alias, &inode->i_dentry); /* d_instantiate */
++ dentry->d_inode = inode;
++do_rehash:
++ if (rehash)
++ __d_rehash(dentry, 0); /* d_rehash */
++ spin_unlock(&dcache_lock);
++
++ return NULL;
+}
+
+/*
+ * This function is spliced into ext3_lookup and returns 1 the file
+ * name is __iopen__ and dentry has been filled in appropriately.
+ */
-+int ext3_check_for_iopen(struct inode * dir, struct dentry *dentry)
++int ext3_check_for_iopen(struct inode *dir, struct dentry *dentry)
+{
-+ struct inode * inode;
++ struct inode *inode;
+
+ if (dir->i_ino != EXT3_ROOT_INO ||
+ !test_opt(dir->i_sb, IOPEN) ||
+ * number is the one for /__iopen__, in which case the inode is filled
+ * in appropriately. Otherwise, this fuction returns 0.
+ */
-+int ext3_iopen_get_inode(struct inode * inode)
++int ext3_iopen_get_inode(struct inode *inode)
+{
+ if (inode->i_ino != EXT3_BAD_INO)
+ return 0;
+
+ return 1;
+}
-Index: linux-2.6.4-51.1/fs/ext3/iopen.h
+Index: linux-stage/fs/ext3/iopen.h
===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/iopen.h 2004-04-06 00:31:24.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/iopen.h 2004-04-06 00:31:24.000000000 -0400
+--- linux-stage.orig/fs/ext3/iopen.h 2004-05-07 16:00:17.000000000 -0400
++++ linux-stage/fs/ext3/iopen.h 2004-05-07 16:00:17.000000000 -0400
@@ -0,0 +1,15 @@
+/*
+ * iopen.h
+ * Public License.
+ */
+
-+extern int ext3_check_for_iopen(struct inode * dir, struct dentry *dentry);
-+extern int ext3_iopen_get_inode(struct inode * inode);
-+
-+
-Index: linux-2.6.4-51.1/fs/ext3/namei.c
++extern int ext3_check_for_iopen(struct inode *dir, struct dentry *dentry);
++extern int ext3_iopen_get_inode(struct inode *inode);
++extern struct dentry *iopen_connect_dentry(struct dentry *dentry,
++ struct inode *inode, int rehash);
+Index: linux-stage/fs/ext3/namei.c
===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/namei.c 2004-04-06 00:31:11.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/namei.c 2004-04-06 00:31:24.000000000 -0400
+--- linux-stage.orig/fs/ext3/namei.c 2004-05-07 16:00:16.000000000 -0400
++++ linux-stage/fs/ext3/namei.c 2004-05-07 16:00:17.000000000 -0400
@@ -37,6 +37,7 @@
#include <linux/buffer_head.h>
#include <linux/smp_lock.h>
#include "acl.h"
/*
-@@ -970,15 +971,21 @@
- }
- #endif
-
-+struct dentry *iopen_connect_dentry(struct dentry *de, struct inode *inode);
-+
- static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
- {
- struct inode * inode;
- struct ext3_dir_entry_2 * de;
- struct buffer_head * bh;
-+ struct dentry *alternate = NULL;
-
+@@ -979,6 +980,9 @@
if (dentry->d_name.len > EXT3_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
-+ if (ext3_check_for_iopen(dir, dentry))
-+ return NULL;
++ if (ext3_check_for_iopen(dir, dentry))
++ return NULL;
+
bh = ext3_find_entry(dentry, &de);
inode = NULL;
if (bh) {
-@@ -989,8 +996,14 @@
+@@ -989,10 +993,8 @@
if (!inode)
return ERR_PTR(-EACCES);
}
-+ if (inode && (alternate = iopen_connect_dentry(dentry, inode))) {
-+ iput(inode);
-+ return alternate;
-+ }
+- if (inode)
+- return d_splice_alias(inode, dentry);
+- d_add(dentry, inode);
+- return NULL;
+
- if (inode)
- return d_splice_alias(inode, dentry);
++ return iopen_connect_dentry(dentry, inode, 1);
+ }
+
+
+@@ -2019,10 +2021,6 @@
+ inode->i_nlink);
+ inode->i_version++;
+ inode->i_nlink = 0;
+- /* There's no need to set i_disksize: the fact that i_nlink is
+- * zero will ensure that the right thing happens during any
+- * recovery. */
+- inode->i_size = 0;
+ ext3_orphan_add(handle, inode);
+ inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+ ext3_mark_inode_dirty(handle, inode);
+@@ -2139,6 +2137,23 @@
+ return err;
+ }
+
++/* Like ext3_add_nondir() except for call to iopen_connect_dentry */
++static int ext3_add_link(handle_t *handle, struct dentry *dentry,
++ struct inode *inode)
++{
++ int err = ext3_add_entry(handle, dentry, inode);
++ if (!err) {
++ err = ext3_mark_inode_dirty(handle, inode);
++ if (err == 0) {
++ (void)iopen_connect_dentry(dentry, inode, 0);
++ return 0;
++ }
++ }
++ ext3_dec_count(handle, inode);
++ iput(inode);
++ return err;
++}
+
- d_add(dentry, inode);
- return NULL;
+ static int ext3_link (struct dentry * old_dentry,
+ struct inode * dir, struct dentry *dentry)
+ {
+@@ -2161,7 +2176,8 @@
+ ext3_inc_count(handle, inode);
+ atomic_inc(&inode->i_count);
+
+- err = ext3_add_nondir(handle, dentry, inode);
++ err = ext3_add_link(handle, dentry, inode);
++ ext3_orphan_del(handle,inode);
+ ext3_journal_stop(handle);
+ return err;
}
-Index: linux-2.6.4-51.1/fs/ext3/super.c
+Index: linux-stage/fs/ext3/super.c
===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/super.c 2004-04-06 00:31:14.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/super.c 2004-04-06 00:31:24.000000000 -0400
+--- linux-stage.orig/fs/ext3/super.c 2004-05-07 16:00:16.000000000 -0400
++++ linux-stage/fs/ext3/super.c 2004-05-07 17:21:59.000000000 -0400
@@ -536,7 +536,7 @@
Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, Opt_noload,
Opt_commit, Opt_journal_update, Opt_journal_inum,
set_opt(sbi->s_mount_opt, ABORT);
break;
+ case Opt_iopen:
-+ set_opt (sbi->s_mount_opt, IOPEN);
-+ clear_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
++ set_opt (sbi->s_mount_opt, IOPEN);
++ clear_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
+ break;
+ case Opt_noiopen:
+ clear_opt (sbi->s_mount_opt, IOPEN);
-+ clear_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
++ clear_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
+ break;
+ case Opt_iopen_nopriv:
-+ set_opt (sbi->s_mount_opt, IOPEN);
-+ set_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
++ set_opt (sbi->s_mount_opt, IOPEN);
++ set_opt (sbi->s_mount_opt, IOPEN_NOPRIV);
+ break;
case Opt_ignore:
break;
default:
-Index: linux-2.6.4-51.1/include/linux/ext3_fs.h
+Index: linux-stage/include/linux/ext3_fs.h
===================================================================
---- linux-2.6.4-51.1.orig/include/linux/ext3_fs.h 2004-04-06 00:31:11.000000000 -0400
-+++ linux-2.6.4-51.1/include/linux/ext3_fs.h 2004-04-06 00:31:24.000000000 -0400
+--- linux-stage.orig/include/linux/ext3_fs.h 2004-05-07 16:00:16.000000000 -0400
++++ linux-stage/include/linux/ext3_fs.h 2004-05-07 16:00:17.000000000 -0400
@@ -325,6 +325,8 @@
#define EXT3_MOUNT_NO_UID32 0x2000 /* Disable 32-bit UIDs */
#define EXT3_MOUNT_XATTR_USER 0x4000 /* Extended user attributes */
/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
-Index: linux-2.6.4-51.1/fs/ext3/Makefile
-===================================================================
---- linux-2.6.4-51.1.orig/fs/ext3/Makefile 2004-04-06 00:27:21.000000000 -0400
-+++ linux-2.6.4-51.1/fs/ext3/Makefile 2004-04-06 00:31:42.000000000 -0400
-@@ -5,7 +5,7 @@
- obj-$(CONFIG_EXT3_FS) += ext3.o
-
- ext3-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
-- ioctl.o namei.o super.o symlink.o hash.o
-+ ioctl.o namei.o super.o symlink.o hash.o iopen.o
-
- ext3-$(CONFIG_EXT3_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
- ext3-$(CONFIG_EXT3_FS_POSIX_ACL) += acl.o
git://git.whamcloud.com / fs / lustre-release.git / blobdiff