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ext2fs locking [PATCH]
|
From: |
Marco Gerards |
|
Subject: |
ext2fs locking [PATCH] |
|
Date: |
Sun, 07 Mar 2004 17:34:52 +0100 |
|
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) |
Hi,
This patch implements what Marcus and Roland proposed to fix the fatfs
locking issue. This patch only deals with the reading problem of
fatfs, the writing part will be a lot more work. I will do that
later.
Thanks,
Marco
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* diskfs.h (diskfs_cached_lookup): Add DIR argument.
* fsys-getfile.c (diskfs_S_fsys_getfile): Use the DIR argument of
diskfs_cached_lookup.
* name-cache.c (diskfs_check_lookup_cache): Likewise.
Index: diskfs.h
===================================================================
RCS file: /cvsroot/hurd/hurd/libdiskfs/diskfs.h,v
retrieving revision 1.98
diff -u -p -r1.98 diskfs.h
--- diskfs.h 27 Jun 2002 19:19:13 -0000 1.98
+++ diskfs.h 7 Mar 2004 14:59:01 -0000
@@ -1,5 +1,5 @@
/* Definitions for fileserver helper functions
- Copyright (C) 1994,95,96,97,98,99,2001,02 Free Software Foundation, Inc.
+ Copyright (C) 1994,95,96,97,98,99,2001,02,2004 Free Software Foundation,
Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
@@ -751,8 +751,10 @@ error_t diskfs_dirrewrite (struct node *
error_t diskfs_dirremove (struct node *dp, struct node *np,
const char *name, struct dirstat *ds);
-/* Return the node corresponding to CACHE_ID in *NPP. */
-error_t diskfs_cached_lookup (ino64_t cache_id, struct node **npp);
+/* Return the node corresponding to CACHE_ID in *NPP. If the
+ directory containing the node is locked DIR is set to its node. */
+error_t diskfs_cached_lookup (ino64_t cache_id, struct node **npp,
+ struct node *dir);
/* Create a new node. Give it MODE; if that includes IFDIR, also
initialize `.' and `..' in the new directory. Return the node in NPP.
Index: fsys-getfile.c
===================================================================
RCS file: /cvsroot/hurd/hurd/libdiskfs/fsys-getfile.c,v
retrieving revision 1.9
diff -u -p -r1.9 fsys-getfile.c
--- fsys-getfile.c 26 Mar 2002 14:59:52 -0000 1.9
+++ fsys-getfile.c 7 Mar 2004 14:59:02 -0000
@@ -1,6 +1,6 @@
/* Return the file for a given handle (for nfs server support)
- Copyright (C) 1997,99,2001,02 Free Software Foundation, Inc.
+ Copyright (C) 1997,99,2001,02,2004 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
@@ -55,7 +55,7 @@ diskfs_S_fsys_getfile (mach_port_t fsys,
f = (const union diskfs_fhandle *) handle;
- err = diskfs_cached_lookup (f->data.cache_id, &node);
+ err = diskfs_cached_lookup (f->data.cache_id, &node, 0);
if (err)
{
ports_port_deref (pt);
Index: name-cache.c
===================================================================
RCS file: /cvsroot/hurd/hurd/libdiskfs/name-cache.c,v
retrieving revision 1.12
diff -u -p -r1.12 name-cache.c
--- name-cache.c 24 Oct 1998 07:50:11 -0000 1.12
+++ name-cache.c 7 Mar 2004 14:59:02 -0000
@@ -1,6 +1,6 @@
/* Directory name lookup caching
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 2004 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG, & Miles Bader.
This file is part of the GNU Hurd.
@@ -238,7 +238,7 @@ diskfs_check_lookup_cache (struct node *
if (name[0] == '.' && name[1] == '.' && name[2] == '\0')
{
mutex_unlock (&dir->lock);
- err = diskfs_cached_lookup (id, &np);
+ err = diskfs_cached_lookup (id, &np, 0);
mutex_lock (&dir->lock);
/* In the window where DP was unlocked, we might
@@ -253,7 +253,7 @@ diskfs_check_lookup_cache (struct node *
}
}
else
- err = diskfs_cached_lookup (id, &np);
+ err = diskfs_cached_lookup (id, &np, dir);
return err ? 0 : np;
}
}
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* hurd.texi (Diskfs Callbacks): Added argument to
diskfs_cached_lookup.
Index: hurd.texi
===================================================================
RCS file: /cvsroot/hurd/hurd/doc/hurd.texi,v
retrieving revision 1.26
diff -u -p -r1.26 hurd.texi
--- hurd.texi 1 Feb 2004 22:04:51 -0000 1.26
+++ hurd.texi 7 Mar 2004 15:02:26 -0000
@@ -98,7 +98,7 @@
@end direntry
@ifinfo
-Copyright @copyright{} 1994-2002 Free Software Foundation, Inc.
+Copyright @copyright{} 1994-2004 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of
this manual provided the copyright notice and this permission notice
@@ -3969,8 +3969,9 @@ not exist, then return -1. Otherwise, r
with a newly-allocated reference.
@end deftypefun
-@deftypefun error_t diskfs_cached_lookup (@w{int @var{cache_id}}, @w{struct
node **@var{npp}})
+@deftypefun error_t diskfs_cached_lookup (@w{int @var{cache_id}}, @w{struct
node **@var{npp}}, @w{struct node *@var{dir}})
Return the node corresponding to @var{cache_id} in @code{*@var{npp}}.
+If the directory containing the node is locked @code{*@var{dir}} is set to its
node.
@end deftypefun
@deftypefun void diskfs_enter_lookup_cache (@w{struct node *@var{dir}},
@w{struct node *@var{np}}, @w{char *@var{name}})
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* inode.c (read_node): Add DIR argument to prototype.
(diskfs_cached_lookup): Add DIR argument, change all callers.
(read_node): Add DIR argument and change all callers. Do not
lookup the directory when DIR already holds it, in that case don't
call diskfs_nput before returning.
Index: inode.c
===================================================================
RCS file: /cvsroot/hurd/hurd/fatfs/inode.c,v
retrieving revision 1.5
diff -u -p -r1.5 inode.c
--- inode.c 6 Aug 2003 21:47:57 -0000 1.5
+++ inode.c 7 Mar 2004 14:59:49 -0000
@@ -1,5 +1,5 @@
/* inode.c - Inode management routines.
- Copyright (C) 1994,95,96,97,98,99,2000,02,03 Free Software Foundation, Inc.
+ Copyright (C) 1994,95,96,97,98,99,2000,02,03,2004 Free Software Foundation,
Inc.
Modified for fatfs by Marcus Brinkmann <marcus@gnu.org>
This file is part of the GNU Hurd.
@@ -42,7 +42,7 @@
static struct node *nodehash[INOHSZ];
-static error_t read_node (struct node *np, vm_address_t buf);
+static error_t read_node (struct node *np, vm_address_t buf, struct node *dir);
/* Initialize the inode hash table. */
void
@@ -56,7 +56,7 @@ inode_init ()
/* Fetch inode INUM, set *NPP to the node structure; gain one user
reference and lock the node. */
error_t
-diskfs_cached_lookup (ino64_t inum, struct node **npp)
+diskfs_cached_lookup (ino64_t inum, struct node **npp, struct node *dir)
{
error_t err;
struct node *np;
@@ -106,7 +106,7 @@ diskfs_cached_lookup (ino64_t inum, stru
spin_unlock (&diskfs_node_refcnt_lock);
/* Get the contents of NP off disk. */
- err = read_node (np, 0);
+ err = read_node (np, 0, dir);
if (err)
return err;
@@ -171,7 +171,7 @@ diskfs_cached_lookup_in_dirbuf (int inum
spin_unlock (&diskfs_node_refcnt_lock);
/* Get the contents of NP off disk. */
- err = read_node (np, buf);
+ err = read_node (np, buf, 0);
if (err)
return err;
@@ -262,14 +262,14 @@ diskfs_new_hardrefs (struct node *np)
/* Read stat information out of the directory entry. */
static error_t
-read_node (struct node *np, vm_address_t buf)
+read_node (struct node *np, vm_address_t buf, struct node *dir)
{
/* XXX This needs careful investigation. */
error_t err;
struct stat *st = &np->dn_stat;
struct disknode *dn = np->dn;
struct dirrect *dr;
- struct node *dp = 0;
+ struct node *dp = dir;
struct vi_key vk = vi_key(np->dn->inode);
vm_prot_t prot = VM_PROT_READ;
memory_object_t memobj;
@@ -306,17 +306,22 @@ read_node (struct node *np, vm_address_t
{
if (buf == 0)
{
- /* FIXME: We know intimately that the parent dir is locked
- by libdiskfs. The only case it is not locked is for NFS
- (fsys_getfile) and we disabled that. */
- dp = ifind (vk.dir_inode);
- assert (dp);
-
+ if (!dp)
+ {
+ err = diskfs_cached_lookup (vk.dir_inode, &dp, 0);
+ if (err)
+ return err;
+ }
+
/* Map in the directory contents. */
memobj = diskfs_get_filemap (dp, prot);
if (memobj == MACH_PORT_NULL)
- return errno;
+ {
+ if (!dir)
+ diskfs_nput (dp);
+ return errno;
+ }
buflen = round_page (dp->dn_stat.st_size);
err = vm_map (mach_task_self (),
@@ -359,6 +364,8 @@ read_node (struct node *np, vm_address_t
{
if (our_buf && buf)
munmap ((caddr_t) buf, buflen);
+ if (dp && !dir)
+ diskfs_nput (np);
return err;
}
st->st_size = np->allocsize;
@@ -394,6 +401,8 @@ read_node (struct node *np, vm_address_t
if (our_buf && buf)
munmap ((caddr_t) buf, buflen);
+ if (dp && !dir)
+ diskfs_nput (dp);
return 0;
}
@@ -532,7 +541,7 @@ diskfs_node_reload (struct node *node)
last = next;
}
flush_node_pager (node);
- read_node (node, 0);
+ read_node (node, 0, 0);
return 0;
}
@@ -770,7 +779,7 @@ diskfs_alloc_node (struct node *dir, mod
if (err)
return err;
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
return err;
Index: main.c
===================================================================
RCS file: /cvsroot/hurd/hurd/fatfs/main.c,v
retrieving revision 1.3
diff -u -p -r1.3 main.c
--- main.c 2 Aug 2003 21:32:52 -0000 1.3
+++ main.c 7 Mar 2004 14:59:49 -0000
@@ -201,7 +201,7 @@ fetch_root ()
/* Allocate a node for the root directory disknode in
diskfs_root_node. */
if (!err)
- err = diskfs_cached_lookup (inum, &diskfs_root_node);
+ err = diskfs_cached_lookup (inum, &diskfs_root_node, 0);
assert_perror (err);
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* node.c (diskfs_cached_lookup): Added DIR argument and changed
all callers.
Index: alloc.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ufs/alloc.c,v
retrieving revision 1.24
diff -u -p -r1.24 alloc.c
--- alloc.c 11 Jun 2002 21:41:03 -0000 1.24
+++ alloc.c 7 Mar 2004 14:57:20 -0000
@@ -1,5 +1,5 @@
/* Disk allocation routines
- Copyright (C) 1993,94,95,96,98,2002 Free Software Foundation, Inc.
+ Copyright (C) 1993,94,95,96,98,2002,2004 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
@@ -681,7 +681,7 @@ diskfs_alloc_node (struct node *dir,
spin_unlock (&alloclock);
if (ino == 0)
goto noinodes;
- error = diskfs_cached_lookup (ino, &np);
+ error = diskfs_cached_lookup (ino, &np, 0);
assert ("duplicate allocation" && !np->dn_stat.st_mode);
assert (! (np->dn_stat.st_mode & S_IPTRANS));
if (np->dn_stat.st_blocks) {
Index: dir.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ufs/dir.c,v
retrieving revision 1.45
diff -u -p -r1.45 dir.c
--- dir.c 1 Aug 2002 00:59:18 -0000 1.45
+++ dir.c 7 Mar 2004 14:57:26 -0000
@@ -220,7 +220,7 @@ diskfs_lookup_hard (struct node *dp, con
}
else
{
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
goto out;
}
@@ -245,7 +245,7 @@ diskfs_lookup_hard (struct node *dp, con
try *again*. */
diskfs_nput (np);
mutex_unlock (&dp->lock);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
mutex_lock (&dp->lock);
if (err)
goto out;
@@ -260,7 +260,7 @@ diskfs_lookup_hard (struct node *dp, con
repeat the directory scan to see if this is still
right. */
mutex_unlock (&dp->lock);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
mutex_lock (&dp->lock);
if (err)
goto out;
@@ -275,7 +275,7 @@ diskfs_lookup_hard (struct node *dp, con
else if (type == LOOKUP)
{
diskfs_nput (dp);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
goto out;
}
Index: inode.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ufs/inode.c,v
retrieving revision 1.59
diff -u -p -r1.59 inode.c
--- inode.c 11 Jun 2002 21:41:06 -0000 1.59
+++ inode.c 7 Mar 2004 14:57:27 -0000
@@ -1,5 +1,5 @@
/* Inode management routines
- Copyright (C) 1994,95,96,97,98,2000,01,02 Free Software Foundation, Inc.
+ Copyright (C) 1994,95,96,97,98,2000,01,02,2004 Free Software Foundation,
Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
@@ -47,7 +47,7 @@ inode_init ()
/* Fetch inode INUM, set *NPP to the node structure;
gain one user reference and lock the node. */
error_t
-diskfs_cached_lookup (ino_t inum, struct node **npp)
+diskfs_cached_lookup (ino_t inum, struct node **npp, struct node *dir)
{
struct disknode *dn;
struct node *np;
Index: main.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ufs/main.c,v
retrieving revision 1.50
diff -u -p -r1.50 main.c
--- main.c 8 May 2002 09:59:52 -0000 1.50
+++ main.c 7 Mar 2004 14:57:27 -0000
@@ -44,7 +44,7 @@ static void
warp_root (void)
{
error_t err;
- err = diskfs_cached_lookup (2, &diskfs_root_node);
+ err = diskfs_cached_lookup (2, &diskfs_root_node, 0);
assert (!err);
mutex_unlock (&diskfs_root_node->lock);
}
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* node.c (diskfs_cached_lookup): Added DIR argument and changed
all callers.
Index: dir.c
===================================================================
RCS file: /cvsroot/hurd/hurd/tmpfs/dir.c,v
retrieving revision 1.12
diff -u -p -r1.12 dir.c
--- dir.c 13 Jun 2002 21:27:13 -0000 1.12
+++ dir.c 7 Mar 2004 14:53:54 -0000
@@ -198,7 +198,7 @@ diskfs_lookup_hard (struct node *dp,
else
{
mutex_unlock (&dp->lock);
- err = diskfs_cached_lookup ((ino_t) (intptr_t) dddn, np);
+ err = diskfs_cached_lookup ((ino_t) (intptr_t) dddn, np, 0);
if (type == (LOOKUP|SPEC_DOTDOT))
diskfs_nrele (dp);
@@ -220,7 +220,7 @@ diskfs_lookup_hard (struct node *dp,
ds->prevp = prevp;
if (np)
- return diskfs_cached_lookup ((ino_t) (uintptr_t) d->dn, np);
+ return diskfs_cached_lookup ((ino_t) (uintptr_t) d->dn, np, 0);
else
return 0;
}
Index: node.c
===================================================================
RCS file: /cvsroot/hurd/hurd/tmpfs/node.c,v
retrieving revision 1.12
diff -u -p -r1.12 node.c
--- node.c 11 Jun 2002 21:40:50 -0000 1.12
+++ node.c 7 Mar 2004 14:53:54 -0000
@@ -1,5 +1,5 @@
/* Node state and file contents for tmpfs.
- Copyright (C) 2000,01,02 Free Software Foundation, Inc.
+ Copyright (C) 2000,01,02,2004 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
@@ -52,7 +52,7 @@ diskfs_alloc_node (struct node *dp, mode
spin_unlock (&diskfs_node_refcnt_lock);
dn->type = IFTODT (mode & S_IFMT);
- return diskfs_cached_lookup ((ino_t) (uintptr_t) dn, npp);
+ return diskfs_cached_lookup ((ino_t) (uintptr_t) dn, npp, 0);
}
void
@@ -154,7 +154,7 @@ recompute_blocks (struct node *np)
/* Fetch inode INUM, set *NPP to the node structure;
gain one user reference and lock the node. */
error_t
-diskfs_cached_lookup (ino_t inum, struct node **npp)
+diskfs_cached_lookup (ino_t inum, struct node **npp, struct node *dir)
{
struct disknode *dn = (void *) (uintptr_t) inum;
struct node *np;
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* node.c (diskfs_cached_lookup): Added DIR argument and changed
all callers.
Index: dir.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ext2fs/dir.c,v
retrieving revision 1.45
diff -u -p -r1.45 dir.c
--- dir.c 10 Jan 2004 22:08:58 -0000 1.45
+++ dir.c 7 Mar 2004 14:58:26 -0000
@@ -254,7 +254,7 @@ diskfs_lookup_hard (struct node *dp, con
}
else
{
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
goto out;
}
@@ -279,7 +279,7 @@ diskfs_lookup_hard (struct node *dp, con
try *again*. */
diskfs_nput (np);
mutex_unlock (&dp->lock);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
mutex_lock (&dp->lock);
if (err)
goto out;
@@ -294,7 +294,7 @@ diskfs_lookup_hard (struct node *dp, con
repeat the directory scan to see if this is still
right. */
mutex_unlock (&dp->lock);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
mutex_lock (&dp->lock);
if (err)
goto out;
@@ -309,7 +309,7 @@ diskfs_lookup_hard (struct node *dp, con
else if (type == LOOKUP)
{
diskfs_nput (dp);
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
goto out;
}
Index: ext2fs.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ext2fs/ext2fs.c,v
retrieving revision 1.55
diff -u -p -r1.55 ext2fs.c
--- ext2fs.c 2 Jun 2002 21:40:56 -0000 1.55
+++ ext2fs.c 7 Mar 2004 14:58:29 -0000
@@ -188,7 +188,7 @@ main (int argc, char **argv)
inode_init ();
/* Set diskfs_root_node to the root inode. */
- err = diskfs_cached_lookup (EXT2_ROOT_INO, &diskfs_root_node);
+ err = diskfs_cached_lookup (EXT2_ROOT_INO, &diskfs_root_node, 0);
if (err)
ext2_panic ("can't get root: %s", strerror (err));
else if ((diskfs_root_node->dn_stat.st_mode & S_IFMT) == 0)
Index: ialloc.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ext2fs/ialloc.c,v
retrieving revision 1.38
diff -u -p -r1.38 ialloc.c
--- ialloc.c 8 Oct 2002 23:10:09 -0000 1.38
+++ ialloc.c 7 Mar 2004 14:58:29 -0000
@@ -283,7 +283,7 @@ diskfs_alloc_node (struct node *dir, mod
if (inum == 0)
return ENOSPC;
- err = diskfs_cached_lookup (inum, &np);
+ err = diskfs_cached_lookup (inum, &np, 0);
if (err)
return err;
Index: inode.c
===================================================================
RCS file: /cvsroot/hurd/hurd/ext2fs/inode.c,v
retrieving revision 1.62
diff -u -p -r1.62 inode.c
--- inode.c 8 Oct 2002 23:10:09 -0000 1.62
+++ inode.c 7 Mar 2004 14:58:31 -0000
@@ -1,6 +1,6 @@
/* Inode management routines
- Copyright (C) 1994,95,96,97,98,99,2000,01,02 Free Software Foundation, Inc.
+ Copyright (C) 1994,95,96,97,98,99,2000,01,02,04 Free Software Foundation,
Inc.
Converted for ext2fs by Miles Bader <miles@gnu.org>
@@ -63,7 +63,7 @@ inode_init ()
/* Fetch inode INUM, set *NPP to the node structure;
gain one user reference and lock the node. */
error_t
-diskfs_cached_lookup (ino_t inum, struct node **npp)
+diskfs_cached_lookup (ino_t inum, struct node **npp, struct node *dir)
{
error_t err;
struct node *np;
2004-03-08 Marco Gerards <metgerards@student.han.nl>
* inode.c (diskfs_cached_lookup): Added DIR argument.
Index: inode.c
===================================================================
RCS file: /cvsroot/hurd/hurd/isofs/inode.c,v
retrieving revision 1.16
diff -u -p -r1.16 inode.c
--- inode.c 6 Aug 2002 12:33:17 -0000 1.16
+++ inode.c 7 Mar 2004 15:07:01 -0000
@@ -1,5 +1,5 @@
/*
- Copyright (C) 1997,98,2002 Free Software Foundation, Inc.
+ Copyright (C) 1997,98,2002,2004 Free Software Foundation, Inc.
Written by Thomas Bushnell, n/BSG.
This file is part of the GNU Hurd.
@@ -145,7 +145,7 @@ cache_inode (struct node *np, struct dir
/* Fetch inode with cache id ID; set *NPP to the node structure;
gain one user reference and lock the node. */
error_t
-diskfs_cached_lookup (ino_t id, struct node **npp)
+diskfs_cached_lookup (ino_t id, struct node **npp, struct node *dir)
{
struct node *np;
error_t err;
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