nfsd: use static memory for callback program and stats

[safe/jmp/linux-2.6] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index feaae7e..4798350 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -15,7 +15,7 @@
  *  Added kerneld support: Jacques Gelinas and Bjorn Ekwall
  *  Added change_root: Werner Almesberger & Hans Lermen, Feb '96
  *  Added options to /proc/mounts:
- *    Torbjörn Lindh (torbjorn.lindh@gopta.se), April 14, 1996.
+ *    Torbjörn Lindh (torbjorn.lindh@gopta.se), April 14, 1996.
  *  Added devfs support: Richard Gooch <rgooch@atnf.csiro.au>, 13-JAN-1998
  *  Heavily rewritten for 'one fs - one tree' dcache architecture. AV, Mar 2000
  */
@@ -37,7 +37,9 @@
 #include <linux/idr.h>
 #include <linux/kobject.h>
 #include <linux/mutex.h>
+#include <linux/file.h>
 #include <asm/uaccess.h>
+#include "internal.h"
 
 
 LIST_HEAD(super_blocks);
@@ -105,6 +107,7 @@ static inline void destroy_super(struct super_block *s)
 {
        security_sb_free(s);
        kfree(s->s_subtype);
+       kfree(s->s_options);
        kfree(s);
 }
 
@@ -417,7 +420,7 @@ restart:
 }
 
 /*
- * Call the ->sync_fs super_op against all filesytems which are r/w and
+ * Call the ->sync_fs super_op against all filesystems which are r/w and
  * which implement it.
  *
  * This operation is careful to avoid the livelock which could easily happen
@@ -425,7 +428,7 @@ restart:
  * is used only here.  We set it against all filesystems and then clear it as
  * we sync them.  So redirtied filesystems are skipped.
  *
- * But if process A is currently running sync_filesytems and then process B
+ * But if process A is currently running sync_filesystems and then process B
  * calls sync_filesystems as well, process B will set all the s_need_sync_fs
  * flags again, which will cause process A to resync everything.  Fix that with
  * a local mutex.
@@ -555,21 +558,40 @@ out:
 }
 
 /**
- *     mark_files_ro
+ *     mark_files_ro - mark all files read-only
  *     @sb: superblock in question
  *
- *     All files are marked read/only.  We don't care about pending
- *     delete files so this should be used in 'force' mode only
+ *     All files are marked read-only.  We don't care about pending
+ *     delete files so this should be used in 'force' mode only.
  */
 
 static void mark_files_ro(struct super_block *sb)
 {
        struct file *f;
 
+retry:
        file_list_lock();
        list_for_each_entry(f, &sb->s_files, f_u.fu_list) {
-               if (S_ISREG(f->f_path.dentry->d_inode->i_mode) && file_count(f))
-                       f->f_mode &= ~FMODE_WRITE;
+               struct vfsmount *mnt;
+               if (!S_ISREG(f->f_path.dentry->d_inode->i_mode))
+                      continue;
+               if (!file_count(f))
+                       continue;
+               if (!(f->f_mode & FMODE_WRITE))
+                       continue;
+               f->f_mode &= ~FMODE_WRITE;
+               if (file_check_writeable(f) != 0)
+                       continue;
+               file_release_write(f);
+               mnt = mntget(f->f_path.mnt);
+               file_list_unlock();
+               /*
+                * This can sleep, so we can't hold
+                * the file_list_lock() spinlock.
+                */
+               mnt_drop_write(mnt);
+               mntput(mnt);
+               goto retry;
        }
        file_list_unlock();
 }
@@ -603,6 +625,7 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
                        mark_files_ro(sb);
                else if (!fs_may_remount_ro(sb))
                        return -EBUSY;
+               DQUOT_OFF(sb);
        }
 
        if (sb->s_op->remount_fs) {
@@ -868,12 +891,12 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
        if (!mnt)
                goto out;
 
-       if (data) {
+       if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
                secdata = alloc_secdata();
                if (!secdata)
                        goto out_mnt;
 
-               error = security_sb_copy_data(type, data, secdata);
+               error = security_sb_copy_data(data, secdata);
                if (error)
                        goto out_free_secdata;
        }
@@ -943,10 +966,11 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data)
        put_filesystem(type);
        return mnt;
 }
+EXPORT_SYMBOL_GPL(do_kern_mount);
 
-struct vfsmount *kern_mount(struct file_system_type *type)
+struct vfsmount *kern_mount_data(struct file_system_type *type, void *data)
 {
-       return vfs_kern_mount(type, 0, type->name, NULL);
+       return vfs_kern_mount(type, MS_KERNMOUNT, type->name, data);
 }
 
-EXPORT_SYMBOL(kern_mount);
+EXPORT_SYMBOL_GPL(kern_mount_data);