ext4: Fix build warning in ext4_dirty_inode()

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

diff --git a/fs/file_table.c b/fs/file_table.c
index 55895cc..8eb4404 100644 (file)
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -33,6 +33,9 @@ struct files_stat_struct files_stat = {
 /* public. Not pretty! */
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(files_lock);
 
+/* SLAB cache for file structures */
+static struct kmem_cache *filp_cachep __read_mostly;
+
 static struct percpu_counter nr_files __cacheline_aligned_in_smp;
 
 static inline void file_free_rcu(struct rcu_head *head)
@@ -71,14 +74,14 @@ EXPORT_SYMBOL_GPL(get_max_files);
  * Handle nr_files sysctl
  */
 #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
-int proc_nr_files(ctl_table *table, int write, struct file *filp,
+int proc_nr_files(ctl_table *table, int write,
                      void __user *buffer, size_t *lenp, loff_t *ppos)
 {
        files_stat.nr_files = get_nr_files();
-       return proc_dointvec(table, write, filp, buffer, lenp, ppos);
+       return proc_dointvec(table, write, buffer, lenp, ppos);
 }
 #else
-int proc_nr_files(ctl_table *table, int write, struct file *filp,
+int proc_nr_files(ctl_table *table, int write,
                      void __user *buffer, size_t *lenp, loff_t *ppos)
 {
        return -ENOSYS;
@@ -125,6 +128,7 @@ struct file *get_empty_filp(void)
        atomic_long_set(&f->f_count, 1);
        rwlock_init(&f->f_owner.lock);
        f->f_cred = get_cred(cred);
+       spin_lock_init(&f->f_lock);
        eventpoll_init_file(f);
        /* f->f_version: 0 */
        return f;
@@ -165,7 +169,6 @@ struct file *alloc_file(struct vfsmount *mnt, struct dentry *dentry,
                fmode_t mode, const struct file_operations *fop)
 {
        struct file *file;
-       struct path;
 
        file = get_empty_filp();
        if (!file)
@@ -211,7 +214,7 @@ int init_file(struct file *file, struct vfsmount *mnt, struct dentry *dentry,
         */
        if ((mode & FMODE_WRITE) && !special_file(dentry->d_inode->i_mode)) {
                file_take_write(file);
-               error = mnt_want_write(mnt);
+               error = mnt_clone_write(mnt);
                WARN_ON(error);
        }
        return error;
@@ -396,10 +399,53 @@ too_bad:
        return 0;
 }
 
+/**
+ *     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.
+ */
+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) {
+               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();
+}
+
 void __init files_init(unsigned long mempages)
 { 
        int n; 
-       /* One file with associated inode and dcache is very roughly 1K. 
+
+       filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
+                       SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+
+       /*
+        * One file with associated inode and dcache is very roughly 1K.
         * Per default don't use more than 10% of our memory for files. 
         */