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get rid of nobh_write_begin_newtrunc

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Move the call to vmtruncate to get rid of accessive blocks to the only
remaining caller and rename the non-truncating version to nobh_write_begin.

Get rid of the superflous file argument to it while we're at it.

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 11:29:54 +02:00 • committed by Al Viro
parent eafdc7d190
commit ea0f04e595
4 changed files with 17 additions and 46 deletions
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37
fs/buffer.c
View file

@ -2510,11 +2510,11 @@ static void attach_nobh_buffers(struct page *page, struct buffer_head *head)
}
/*
* Filesystems implementing the new truncate sequence should use the
* _newtrunc postfix variant which won't incorrectly call vmtruncate.
* On entry, the page is fully not uptodate.
* On exit the page is fully uptodate in the areas outside (from,to)
* The filesystem needs to handle block truncation upon failure.
*/
int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
int nobh_write_begin(struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
get_block_t *get_block)
@ -2547,7 +2547,7 @@ int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
unlock_page(page);
page_cache_release(page);
*pagep = NULL;
return block_write_begin_newtrunc(file, mapping, pos, len,
return block_write_begin_newtrunc(NULL, mapping, pos, len,
flags, pagep, fsdata, get_block);
}
@ -2654,35 +2654,6 @@ out_release:
return ret;
}
EXPORT_SYMBOL(nobh_write_begin_newtrunc);
/*
* On entry, the page is fully not uptodate.
* On exit the page is fully uptodate in the areas outside (from,to)
*/
int nobh_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
get_block_t *get_block)
{
int ret;
ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags,
pagep, fsdata, get_block);
/*
* prepare_write() may have instantiated a few blocks
* outside i_size. Trim these off again. Don't need
* i_size_read because we hold i_mutex.
*/
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
EXPORT_SYMBOL(nobh_write_begin);
int nobh_write_end(struct file *file, struct address_space *mapping,

9
fs/ext2/inode.c
View file

@ -806,13 +806,8 @@ ext2_nobh_write_begin(struct file *file, struct address_space *mapping,
{
int ret;
/*
* Dir-in-pagecache still uses ext2_write_begin. Would have to rework
* directory handling code to pass around offsets rather than struct
* pages in order to make this work easily.
*/
ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags, pagep,
fsdata, ext2_get_block);
ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
ext2_get_block);
if (ret < 0)
ext2_write_failed(mapping, pos + len);
return ret;

11
fs/jfs/inode.c
View file

@ -303,8 +303,17 @@ static int jfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
return nobh_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
int ret;
ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
jfs_get_block);
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
static sector_t jfs_bmap(struct address_space *mapping, sector_t block)

6
include/linux/buffer_head.h
View file

@ -231,11 +231,7 @@ void block_sync_page(struct page *);
sector_t generic_block_bmap(struct address_space *, sector_t, get_block_t *);
int block_truncate_page(struct address_space *, loff_t, get_block_t *);
int file_fsync(struct file *, int);
int nobh_write_begin_newtrunc(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int nobh_write_begin(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
int nobh_write_begin(struct address_space *, loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int nobh_write_end(struct file *, struct address_space *,
loff_t, unsigned, unsigned,