shmem truncate optimizations and cleanup

Hi Alan,

The appended patch speeds up the truncate logic of shmem.c considerably and makes it more readable.

Would you apply it to your -ac series?

I will go on with some cache lookup optimizations and probably read/write support.

Greetings
Christoph

diff -uNr 4-13-5/include/linux/shmem_fs.h c/include/linux/shmem_fs.h
@@ -19,6 +19,7 @@
 
 struct shmem_inode_info {
 	spinlock_t	lock;
+	unsigned long	max_index;
 	swp_entry_t	i_direct[SHMEM_NR_DIRECT]; /* for the first blocks */
 	swp_entry_t   **i_indirect; /* doubly indirect blocks */
 	unsigned long	swapped;

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