mm/fs: remove truncate_range

Remove vmtruncate_range(), and remove the truncate_range method from
struct inode_operations: only tmpfs ever supported it, and tmpfs has now
converted over to using the fallocate method of file_operations.

Update Documentation accordingly, adding (setlease and) fallocate lines.
And while we're in mm.h, remove duplicate declarations of shmem_lock() and
shmem_file_setup(): everyone is now using the ones in shmem_fs.h.

Based-on-patch-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Cong Wang <amwang@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 0 insertions, 26 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 7e54ff1c63e1..f368d0acb52c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2541,7 +2541,6 @@ static const struct file_operations shmem_file_operations = {
 
 static const struct inode_operations shmem_inode_operations = {
         .setattr        = shmem_setattr,
-        .truncate_range = shmem_truncate_range,
 #ifdef CONFIG_TMPFS_XATTR
         .setxattr       = shmem_setxattr,
         .getxattr       = shmem_getxattr,
diff --git a/mm/truncate.c b/mm/truncate.c
index 61a183b89df6..75801acdaac7 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -602,31 +602,6 @@ int vmtruncate(struct inode *inode, loff_t newsize)
 }
 EXPORT_SYMBOL(vmtruncate);
 
-int vmtruncate_range(struct inode *inode, loff_t lstart, loff_t lend)
-{
-        struct address_space *mapping = inode->i_mapping;
-        loff_t holebegin = round_up(lstart, PAGE_SIZE);
-        loff_t holelen = 1 + lend - holebegin;
-
-        /*
-         * If the underlying filesystem is not going to provide
-         * a way to truncate a range of blocks (punch a hole) -
-         * we should return failure right now.
-         */
-        if (!inode->i_op->truncate_range)
-                return -ENOSYS;
-
-        mutex_lock(&inode->i_mutex);
-        inode_dio_wait(inode);
-        unmap_mapping_range(mapping, holebegin, holelen, 1);
-        inode->i_op->truncate_range(inode, lstart, lend);
-        /* unmap again to remove racily COWed private pages */
-        unmap_mapping_range(mapping, holebegin, holelen, 1);
-        mutex_unlock(&inode->i_mutex);
-
-        return 0;
-}
-
 /**
  * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
  * @inode: inode