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mm/fs: remove truncate_range

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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 <[email protected]>
Signed-off-by: Hugh Dickins <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Cong Wang <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2012-05-29 15:06:41 -07:00 • committed by Linus Torvalds
commit 17cf28afea
7 changed files with 8 additions and 39 deletions
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25
mm/truncate.c
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@ -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