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clean up write_begin usage for directories in pagecache

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For filesystem that implement directories in pagecache we call
block_write_begin with an already allocated page for this code, while the
normal regular file write path uses the default block_write_begin behaviour.

Get rid of the __foofs_write_begin helper and opencode the normal write_begin
call in foofs_write_begin, while adding a new foofs_prepare_chunk helper for
the directory code.  The added benefit is that foofs_prepare_chunk has
a much saner calling convention.

Note that the interruptible flag passed into block_write_begin is always
ignored if we already pass in a page (see next patch for details), and
we never were doing truncations of exessive blocks for this case either so we
can switch directly to block_write_begin_newtrunc.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2010-06-04 11:29:56 +02:00
committed by Al Viro
parent 282dc17884
commit f4e420dc42
13 changed files with 57 additions and 107 deletions
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11
fs/minix/inode.c
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@ -357,12 +357,10 @@ static int minix_readpage(struct file *file, struct page *page)
return block_read_full_page(page,minix_get_block);
}
int __minix_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len)
{
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
minix_get_block);
return block_write_begin_newtrunc(NULL, page->mapping, pos, len, 0,
&page, NULL, minix_get_block);
}
static int minix_write_begin(struct file *file, struct address_space *mapping,
@ -370,7 +368,8 @@ static int minix_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return __minix_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
minix_get_block);
}
static sector_t minix_bmap(struct address_space *mapping, sector_t block)