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Diffstat (limited to 'fs/gfs2/ops_super.c')
-rw-r--r--fs/gfs2/ops_super.c44
1 files changed, 33 insertions, 11 deletions
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 320323d03479..458019569dcb 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -19,7 +19,6 @@
#include <linux/delay.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
-#include <linux/lm_interface.h>
#include <linux/time.h>
#include "gfs2.h"
@@ -27,7 +26,6 @@
#include "glock.h"
#include "inode.h"
#include "log.h"
-#include "mount.h"
#include "quota.h"
#include "recovery.h"
#include "rgrp.h"
@@ -40,6 +38,8 @@
#include "bmap.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
* @inode: The inode
@@ -435,25 +435,45 @@ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_args args = sdp->sd_args; /* Default to current settings */
int error;
- error = gfs2_mount_args(sdp, data, 1);
+ error = gfs2_mount_args(sdp, &args, data);
if (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)
*flags |= MS_RDONLY;
- else {
- if (*flags & MS_RDONLY) {
- if (!(sb->s_flags & MS_RDONLY))
- error = gfs2_make_fs_ro(sdp);
- } else if (!(*flags & MS_RDONLY) &&
- (sb->s_flags & MS_RDONLY)) {
+
+ if ((sb->s_flags ^ *flags) & MS_RDONLY) {
+ if (*flags & MS_RDONLY)
+ error = gfs2_make_fs_ro(sdp);
+ else
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;
}
/**
@@ -588,6 +608,8 @@ static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
}
seq_printf(s, ",data=%s", state);
}
+ if (args->ar_discard)
+ seq_printf(s, ",discard");
return 0;
}