Commit 6f04c1c7 authored by Steven Whitehouse's avatar Steven Whitehouse Committed by Steven Whitehouse

GFS2: Fix remount argument parsing

The following patch fixes an issue relating to remount and argument
parsing. After this fix is applied, remount becomes atomic in that
it either succeeds changing the mount to the new state, or it fails
and leaves it in the old state. Previously it was possible for the
parsing of options to fail part way though and for the fs to be left
in a state where some of the new arguments had been applied, but some
had not.
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 8e0ee43b
...@@ -17,7 +17,7 @@ ...@@ -17,7 +17,7 @@
#include "gfs2.h" #include "gfs2.h"
#include "incore.h" #include "incore.h"
#include "mount.h" #include "super.h"
#include "sys.h" #include "sys.h"
#include "util.h" #include "util.h"
...@@ -77,101 +77,46 @@ static const match_table_t tokens = { ...@@ -77,101 +77,46 @@ static const match_table_t tokens = {
* Return: errno * Return: errno
*/ */
int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount) int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
{ {
struct gfs2_args *args = &sdp->sd_args; char *o;
char *data = data_arg; int token;
char *options, *o, *v; substring_t tmp[MAX_OPT_ARGS];
int error = 0;
if (!remount) {
/* Set some defaults */
args->ar_quota = GFS2_QUOTA_DEFAULT;
args->ar_data = GFS2_DATA_DEFAULT;
}
/* Split the options into tokens with the "," character and /* Split the options into tokens with the "," character and
process them */ process them */
for (options = data; (o = strsep(&options, ",")); ) { while (1) {
int token; o = strsep(&options, ",");
substring_t tmp[MAX_OPT_ARGS]; if (o == NULL)
break;
if (!*o) if (*o == '\0')
continue; continue;
token = match_token(o, tokens, tmp); token = match_token(o, tokens, tmp);
switch (token) { switch (token) {
case Opt_lockproto: case Opt_lockproto:
v = match_strdup(&tmp[0]); match_strlcpy(args->ar_lockproto, &tmp[0],
if (!v) { GFS2_LOCKNAME_LEN);
fs_info(sdp, "no memory for lockproto\n");
error = -ENOMEM;
goto out_error;
}
if (remount && strcmp(v, args->ar_lockproto)) {
kfree(v);
goto cant_remount;
}
strncpy(args->ar_lockproto, v, GFS2_LOCKNAME_LEN);
args->ar_lockproto[GFS2_LOCKNAME_LEN - 1] = 0;
kfree(v);
break; break;
case Opt_locktable: case Opt_locktable:
v = match_strdup(&tmp[0]); match_strlcpy(args->ar_locktable, &tmp[0],
if (!v) { GFS2_LOCKNAME_LEN);
fs_info(sdp, "no memory for locktable\n");
error = -ENOMEM;
goto out_error;
}
if (remount && strcmp(v, args->ar_locktable)) {
kfree(v);
goto cant_remount;
}
strncpy(args->ar_locktable, v, GFS2_LOCKNAME_LEN);
args->ar_locktable[GFS2_LOCKNAME_LEN - 1] = 0;
kfree(v);
break; break;
case Opt_hostdata: case Opt_hostdata:
v = match_strdup(&tmp[0]); match_strlcpy(args->ar_hostdata, &tmp[0],
if (!v) { GFS2_LOCKNAME_LEN);
fs_info(sdp, "no memory for hostdata\n");
error = -ENOMEM;
goto out_error;
}
if (remount && strcmp(v, args->ar_hostdata)) {
kfree(v);
goto cant_remount;
}
strncpy(args->ar_hostdata, v, GFS2_LOCKNAME_LEN);
args->ar_hostdata[GFS2_LOCKNAME_LEN - 1] = 0;
kfree(v);
break; break;
case Opt_spectator: case Opt_spectator:
if (remount && !args->ar_spectator)
goto cant_remount;
args->ar_spectator = 1; args->ar_spectator = 1;
sdp->sd_vfs->s_flags |= MS_RDONLY;
break; break;
case Opt_ignore_local_fs: case Opt_ignore_local_fs:
if (remount && !args->ar_ignore_local_fs)
goto cant_remount;
args->ar_ignore_local_fs = 1; args->ar_ignore_local_fs = 1;
break; break;
case Opt_localflocks: case Opt_localflocks:
if (remount && !args->ar_localflocks)
goto cant_remount;
args->ar_localflocks = 1; args->ar_localflocks = 1;
break; break;
case Opt_localcaching: case Opt_localcaching:
if (remount && !args->ar_localcaching)
goto cant_remount;
args->ar_localcaching = 1; args->ar_localcaching = 1;
break; break;
case Opt_debug: case Opt_debug:
...@@ -181,17 +126,13 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount) ...@@ -181,17 +126,13 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
args->ar_debug = 0; args->ar_debug = 0;
break; break;
case Opt_upgrade: case Opt_upgrade:
if (remount && !args->ar_upgrade)
goto cant_remount;
args->ar_upgrade = 1; args->ar_upgrade = 1;
break; break;
case Opt_acl: case Opt_acl:
args->ar_posix_acl = 1; args->ar_posix_acl = 1;
sdp->sd_vfs->s_flags |= MS_POSIXACL;
break; break;
case Opt_noacl: case Opt_noacl:
args->ar_posix_acl = 0; args->ar_posix_acl = 0;
sdp->sd_vfs->s_flags &= ~MS_POSIXACL;
break; break;
case Opt_quota_off: case Opt_quota_off:
args->ar_quota = GFS2_QUOTA_OFF; args->ar_quota = GFS2_QUOTA_OFF;
...@@ -215,29 +156,15 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount) ...@@ -215,29 +156,15 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
args->ar_data = GFS2_DATA_ORDERED; args->ar_data = GFS2_DATA_ORDERED;
break; break;
case Opt_meta: case Opt_meta:
if (remount && args->ar_meta != 1)
goto cant_remount;
args->ar_meta = 1; args->ar_meta = 1;
break; break;
case Opt_err: case Opt_err:
default: default:
fs_info(sdp, "unknown option: %s\n", o); fs_info(sdp, "invalid mount option: %s\n", o);
error = -EINVAL; return -EINVAL;
goto out_error;
} }
} }
out_error: return 0;
if (error)
fs_info(sdp, "invalid mount option(s)\n");
if (data != data_arg)
kfree(data);
return error;
cant_remount:
fs_info(sdp, "can't remount with option %s\n", o);
return -EINVAL;
} }
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#ifndef __MOUNT_DOT_H__
#define __MOUNT_DOT_H__
struct gfs2_sbd;
int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount);
#endif /* __MOUNT_DOT_H__ */
...@@ -25,7 +25,6 @@ ...@@ -25,7 +25,6 @@
#include "glock.h" #include "glock.h"
#include "glops.h" #include "glops.h"
#include "inode.h" #include "inode.h"
#include "mount.h"
#include "recovery.h" #include "recovery.h"
#include "rgrp.h" #include "rgrp.h"
#include "super.h" #include "super.h"
...@@ -1116,12 +1115,20 @@ static int fill_super(struct super_block *sb, void *data, int silent) ...@@ -1116,12 +1115,20 @@ static int fill_super(struct super_block *sb, void *data, int silent)
return -ENOMEM; return -ENOMEM;
} }
error = gfs2_mount_args(sdp, (char *)data, 0); sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
error = gfs2_mount_args(sdp, &sdp->sd_args, data);
if (error) { if (error) {
printk(KERN_WARNING "GFS2: can't parse mount arguments\n"); printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
goto fail; goto fail;
} }
if (sdp->sd_args.ar_spectator)
sb->s_flags |= MS_RDONLY;
if (sdp->sd_args.ar_posix_acl)
sb->s_flags |= MS_POSIXACL;
sb->s_magic = GFS2_MAGIC; sb->s_magic = GFS2_MAGIC;
sb->s_op = &gfs2_super_ops; sb->s_op = &gfs2_super_ops;
sb->s_export_op = &gfs2_export_ops; sb->s_export_op = &gfs2_export_ops;
......
...@@ -27,7 +27,6 @@ ...@@ -27,7 +27,6 @@
#include "glock.h" #include "glock.h"
#include "inode.h" #include "inode.h"
#include "log.h" #include "log.h"
#include "mount.h"
#include "quota.h" #include "quota.h"
#include "recovery.h" #include "recovery.h"
#include "rgrp.h" #include "rgrp.h"
...@@ -40,6 +39,8 @@ ...@@ -40,6 +39,8 @@
#include "bmap.h" #include "bmap.h"
#include "meta_io.h" #include "meta_io.h"
#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
/** /**
* gfs2_write_inode - Make sure the inode is stable on the disk * gfs2_write_inode - Make sure the inode is stable on the disk
* @inode: The inode * @inode: The inode
...@@ -435,25 +436,45 @@ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) ...@@ -435,25 +436,45 @@ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{ {
struct gfs2_sbd *sdp = sb->s_fs_info; struct gfs2_sbd *sdp = sb->s_fs_info;
struct gfs2_args args = sdp->sd_args; /* Default to current settings */
int error; int error;
error = gfs2_mount_args(sdp, data, 1); error = gfs2_mount_args(sdp, &args, data);
if (error) if (error)
return error; return error;
/* Not allowed to change locking details */
if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
return -EINVAL;
/* Some flags must not be changed */
if (args_neq(&args, &sdp->sd_args, spectator) ||
args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
args_neq(&args, &sdp->sd_args, localflocks) ||
args_neq(&args, &sdp->sd_args, localcaching) ||
args_neq(&args, &sdp->sd_args, meta))
return -EINVAL;
if (sdp->sd_args.ar_spectator) if (sdp->sd_args.ar_spectator)
*flags |= MS_RDONLY; *flags |= MS_RDONLY;
else {
if (*flags & MS_RDONLY) { if ((sb->s_flags ^ *flags) & MS_RDONLY) {
if (!(sb->s_flags & MS_RDONLY)) if (*flags & MS_RDONLY)
error = gfs2_make_fs_ro(sdp); error = gfs2_make_fs_ro(sdp);
} else if (!(*flags & MS_RDONLY) && else
(sb->s_flags & MS_RDONLY)) {
error = gfs2_make_fs_rw(sdp); error = gfs2_make_fs_rw(sdp);
} if (error)
return error;
} }
return error; sdp->sd_args = args;
if (sdp->sd_args.ar_posix_acl)
sb->s_flags |= MS_POSIXACL;
else
sb->s_flags &= ~MS_POSIXACL;
return 0;
} }
/** /**
......
...@@ -14,7 +14,7 @@ ...@@ -14,7 +14,7 @@
#include <linux/dcache.h> #include <linux/dcache.h>
#include "incore.h" #include "incore.h"
void gfs2_lm_unmount(struct gfs2_sbd *sdp); extern void gfs2_lm_unmount(struct gfs2_sbd *sdp);
static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp) static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
{ {
...@@ -27,21 +27,23 @@ static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp) ...@@ -27,21 +27,23 @@ static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
void gfs2_jindex_free(struct gfs2_sbd *sdp); void gfs2_jindex_free(struct gfs2_sbd *sdp);
struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid); extern int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *data);
int gfs2_jdesc_check(struct gfs2_jdesc *jd);
int gfs2_lookup_in_master_dir(struct gfs2_sbd *sdp, char *filename, extern struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid);
struct gfs2_inode **ipp); extern int gfs2_jdesc_check(struct gfs2_jdesc *jd);
int gfs2_make_fs_rw(struct gfs2_sbd *sdp); extern int gfs2_lookup_in_master_dir(struct gfs2_sbd *sdp, char *filename,
struct gfs2_inode **ipp);
int gfs2_statfs_init(struct gfs2_sbd *sdp); extern int gfs2_make_fs_rw(struct gfs2_sbd *sdp);
void gfs2_statfs_change(struct gfs2_sbd *sdp,
s64 total, s64 free, s64 dinodes);
int gfs2_statfs_sync(struct gfs2_sbd *sdp);
int gfs2_freeze_fs(struct gfs2_sbd *sdp); extern int gfs2_statfs_init(struct gfs2_sbd *sdp);
void gfs2_unfreeze_fs(struct gfs2_sbd *sdp); extern void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
s64 dinodes);
extern int gfs2_statfs_sync(struct gfs2_sbd *sdp);
extern int gfs2_freeze_fs(struct gfs2_sbd *sdp);
extern void gfs2_unfreeze_fs(struct gfs2_sbd *sdp);
extern struct file_system_type gfs2_fs_type; extern struct file_system_type gfs2_fs_type;
extern struct file_system_type gfs2meta_fs_type; extern struct file_system_type gfs2meta_fs_type;
......
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