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get rid of block_write_begin_newtrunc

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Move the call to vmtruncate to get rid of accessive blocks to the callers
in preparation of the new truncate sequence and rename the non-truncating
version to block_write_begin.

While we're at it also remove several unused arguments to block_write_begin.

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 11:29:58 +02:00 committed by Al Viro
parent 6e1db88d53
commit 155130a4f7
13 changed files with 103 additions and 91 deletions
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14
fs/bfs/file.c
View file

@ -168,9 +168,17 @@ static int bfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags,
pagep, fsdata, bfs_get_block);
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep,
bfs_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 bfs_bmap(struct address_space *mapping, sector_t block)

5
fs/block_dev.c
View file

@ -308,9 +308,8 @@ static int blkdev_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin_newtrunc(file, mapping, pos, len, flags,
pagep, fsdata, blkdev_get_block);
return block_write_begin(mapping, pos, len, flags, pagep,
blkdev_get_block);
}
static int blkdev_write_end(struct file *file, struct address_space *mapping,

61
fs/buffer.c
View file

@ -1962,14 +1962,13 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
EXPORT_SYMBOL(__block_write_begin);
/*
* Filesystems implementing the new truncate sequence should use the
* _newtrunc postfix variant which won't incorrectly call vmtruncate.
* block_write_begin takes care of the basic task of block allocation and
* bringing partial write blocks uptodate first.
*
* The filesystem needs to handle block truncation upon failure.
*/
int block_write_begin_newtrunc(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 block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
unsigned flags, struct page **pagep, get_block_t *get_block)
{
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
struct page *page;
@ -1989,44 +1988,6 @@ int block_write_begin_newtrunc(struct file *file, struct address_space *mapping,
*pagep = page;
return status;
}
EXPORT_SYMBOL(block_write_begin_newtrunc);
/*
* block_write_begin takes care of the basic task of block allocation and
* bringing partial write blocks uptodate first.
*
* If *pagep is not NULL, then block_write_begin uses the locked page
* at *pagep rather than allocating its own. In this case, the page will
* not be unlocked or deallocated on failure.
*/
int block_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 = block_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.
*
* Filesystems which pass down their own page also cannot
* call into vmtruncate here because it would lead to lock
* inversion problems (*pagep is locked). This is a further
* example of where the old truncate sequence is inadequate.
*/
if (unlikely(ret) && *pagep == NULL) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
EXPORT_SYMBOL(block_write_begin);
int block_write_end(struct file *file, struct address_space *mapping,
@ -2357,7 +2318,7 @@ int cont_write_begin(struct file *file, struct address_space *mapping,
err = cont_expand_zero(file, mapping, pos, bytes);
if (err)
goto out;
return err;
zerofrom = *bytes & ~PAGE_CACHE_MASK;
if (pos+len > *bytes && zerofrom & (blocksize-1)) {
@ -2365,11 +2326,7 @@ int cont_write_begin(struct file *file, struct address_space *mapping,
(*bytes)++;
}
*pagep = NULL;
err = block_write_begin_newtrunc(file, mapping, pos, len,
flags, pagep, fsdata, get_block);
out:
return err;
return block_write_begin(mapping, pos, len, flags, pagep, get_block);
}
EXPORT_SYMBOL(cont_write_begin);
@ -2511,8 +2468,8 @@ int nobh_write_begin(struct address_space *mapping,
unlock_page(page);
page_cache_release(page);
*pagep = NULL;
return block_write_begin_newtrunc(NULL, mapping, pos, len,
flags, pagep, fsdata, get_block);
return block_write_begin(mapping, pos, len, flags, pagep,
get_block);
}
if (PageMappedToDisk(page))

5
fs/ext2/inode.c
View file

@ -772,9 +772,8 @@ ext2_write_begin(struct file *file, struct address_space *mapping,
{
int ret;
*pagep = NULL;
ret = block_write_begin_newtrunc(file, mapping, pos, len, flags,
pagep, fsdata, ext2_get_block);
ret = block_write_begin(mapping, pos, len, flags, pagep,
ext2_get_block);
if (ret < 0)
ext2_write_failed(mapping, pos + len);
return ret;

12
fs/minix/inode.c
View file

@ -366,9 +366,17 @@ static int minix_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep,
minix_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 minix_bmap(struct address_space *mapping, sector_t block)

12
fs/nilfs2/inode.c
View file

@ -197,11 +197,15 @@ static int nilfs_write_begin(struct file *file, struct address_space *mapping,
if (unlikely(err))
return err;
*pagep = NULL;
err = block_write_begin(file, mapping, pos, len, flags, pagep,
fsdata, nilfs_get_block);
if (unlikely(err))
err = block_write_begin(mapping, pos, len, flags, pagep,
nilfs_get_block);
if (unlikely(err)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
nilfs_transaction_abort(inode->i_sb);
}
return err;
}

11
fs/nilfs2/recovery.c
View file

@ -505,11 +505,14 @@ static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
}
pos = rb->blkoff << inode->i_blkbits;
page = NULL;
err = block_write_begin(NULL, inode->i_mapping, pos, blocksize,
0, &page, NULL, nilfs_get_block);
if (unlikely(err))
err = block_write_begin(inode->i_mapping, pos, blocksize,
0, &page, nilfs_get_block);
if (unlikely(err)) {
loff_t isize = inode->i_size;
if (pos + blocksize > isize)
vmtruncate(inode, isize);
goto failed_inode;
}
err = nilfs_recovery_copy_block(sbi, rb, page);
if (unlikely(err))

14
fs/omfs/file.c
View file

@ -312,9 +312,17 @@ static int omfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags,
pagep, fsdata, omfs_get_block);
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep,
omfs_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 omfs_bmap(struct address_space *mapping, sector_t block)

13
fs/sysv/itree.c
View file

@ -468,9 +468,16 @@ static int sysv_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
get_block);
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep, 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 sysv_bmap(struct address_space *mapping, sector_t block)

13
fs/udf/inode.c
View file

@ -127,9 +127,16 @@ static int udf_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
udf_get_block);
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep, udf_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 udf_bmap(struct address_space *mapping, sector_t block)

12
fs/ufs/inode.c
View file

@ -567,9 +567,17 @@ static int ufs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
int ret;
ret = block_write_begin(mapping, pos, len, flags, pagep,
ufs_getfrag_block);
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
static sector_t ufs_bmap(struct address_space *mapping, sector_t block)

14
fs/xfs/linux-2.6/xfs_aops.c
View file

@ -1504,9 +1504,17 @@ xfs_vm_write_begin(
struct page **pagep,
void **fsdata)
{
*pagep = NULL;
return block_write_begin(file, mapping, pos, len, flags | AOP_FLAG_NOFS,
pagep, fsdata, xfs_get_blocks);
int ret;
ret = block_write_begin(mapping, pos, len, flags | AOP_FLAG_NOFS,
pagep, xfs_get_blocks);
if (unlikely(ret)) {
loff_t isize = mapping->host->i_size;
if (pos + len > isize)
vmtruncate(mapping->host, isize);
}
return ret;
}
STATIC sector_t

8
include/linux/buffer_head.h
View file

@ -203,12 +203,8 @@ int block_write_full_page_endio(struct page *page, get_block_t *get_block,
int block_read_full_page(struct page*, get_block_t*);
int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc,
unsigned long from);
int block_write_begin_newtrunc(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int block_write_begin(struct file *, struct address_space *,
loff_t, unsigned, unsigned,
struct page **, void **, get_block_t*);
int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
unsigned flags, struct page **pagep, get_block_t *get_block);
int __block_write_begin(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block);
int block_write_end(struct file *, struct address_space *,