[PATCH] VFS: pass file pointer to filesystem from ftruncate()

[net-next-2.6.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index e0b77c5af9a02aadab2a1fcd2e967c92c402ce16..0c89fc9481a8d94ad820238a3c22b6b4042a2548 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -264,6 +264,7 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 #define ATTR_ATTR_FLAG 1024
 #define ATTR_KILL_SUID 2048
 #define ATTR_KILL_SGID 4096
+#define ATTR_FILE      8192
 
 /*
  * This is the Inode Attributes structure, used for notify_change().  It
@@ -283,6 +284,13 @@ struct iattr {
        struct timespec ia_atime;
        struct timespec ia_mtime;
        struct timespec ia_ctime;
+
+       /*
+        * Not an attribute, but an auxilary info for filesystems wanting to
+        * implement an ftruncate() like method.  NOTE: filesystem should
+        * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
+        */
+       struct file     *ia_file;
 };
 
 /*
@@ -320,7 +328,7 @@ struct address_space_operations {
        /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
        sector_t (*bmap)(struct address_space *, sector_t);
        int (*invalidatepage) (struct page *, unsigned long);
-       int (*releasepage) (struct page *, int);
+       int (*releasepage) (struct page *, gfp_t);
        ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
                        loff_t offset, unsigned long nr_segs);
        struct page* (*get_xip_page)(struct address_space *, sector_t,
@@ -574,7 +582,14 @@ struct file_ra_state {
 #define RA_FLAG_INCACHE 0x02   /* file is already in cache */
 
 struct file {
-       struct list_head        f_list;
+       /*
+        * fu_list becomes invalid after file_free is called and queued via
+        * fu_rcuhead for RCU freeing
+        */
+       union {
+               struct list_head        fu_list;
+               struct rcu_head         fu_rcuhead;
+       } f_u;
        struct dentry           *f_dentry;
        struct vfsmount         *f_vfsmnt;
        struct file_operations  *f_op;
@@ -598,7 +613,6 @@ struct file {
        spinlock_t              f_ep_lock;
 #endif /* #ifdef CONFIG_EPOLL */
        struct address_space    *f_mapping;
-       struct rcu_head         f_rcuhead;
 };
 extern spinlock_t files_lock;
 #define file_list_lock() spin_lock(&files_lock);
@@ -1282,7 +1296,7 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
 
 /* fs/open.c */
 
-extern int do_truncate(struct dentry *, loff_t start);
+extern int do_truncate(struct dentry *, loff_t start, struct file *filp);
 extern long do_sys_open(const char __user *filename, int flags, int mode);
 extern struct file *filp_open(const char *, int, int);
 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);