2.6.26-rc1

 fs

diff --git a/fs/super.c b/fs/super.c
index 09008db..453877c 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -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);
@@ -115,7 +117,7 @@ static inline void destroy_super(struct super_block *s)
  * Drop a superblock's refcount.  Returns non-zero if the superblock was
  * destroyed.  The caller must hold sb_lock.
  */
-int __put_super(struct super_block *sb)
+static int __put_super(struct super_block *sb)
 {
    int ret = 0;
 
@@ -177,7 +179,7 @@ void deactivate_super(struct super_block *s)
    if (atomic_dec_and_lock(&s->s_active, &sb_lock)) {
       s->s_count -= S_BIAS-1;
       spin_unlock(&sb_lock);
-      DQUOT_OFF(s);
+      DQUOT_OFF(s, 0);
       down_write(&s->s_umount);
       fs->kill_sb(s);
       put_filesystem(fs);
@@ -567,10 +569,29 @@ 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();
 }
@@ -587,6 +608,7 @@ static void mark_files_ro(struct super_block *sb)
 int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
 {
    int retval;
+   int remount_rw;
    
 #ifdef CONFIG_BLOCK
    if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
@@ -604,8 +626,11 @@ 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);
+      retval = DQUOT_OFF(sb, 1);
+      if (retval < 0 && retval != -ENOSYS)
+         return -EBUSY;
    }
+   remount_rw = !(flags & MS_RDONLY) && (sb->s_flags & MS_RDONLY);
 
    if (sb->s_op->remount_fs) {
       lock_super(sb);
@@ -615,6 +640,8 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
          return retval;
    }
    sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
+   if (remount_rw)
+      DQUOT_ON_REMOUNT(sb);
    return 0;
 }