get rid of block_write_begin_newtrunc
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>
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 88b9a3f..8fc2e9c 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -168,9 +168,17 @@
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)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 65a0c26..63c9d60 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -308,9 +308,8 @@
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,
diff --git a/fs/buffer.c b/fs/buffer.c
index c319c49..50efa33 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1962,14 +1962,13 @@
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 @@
*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 @@
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 @@
(*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 @@
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))
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 2f4dfbc..74dfe5f 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -772,9 +772,8 @@
{
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;
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 6b29e73..125062f 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -366,9 +366,17 @@
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)
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 1dd9e6a..5c694ec 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -197,11 +197,15 @@
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;
}
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index bae2a51..2f11f08 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -505,11 +505,14 @@
}
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))
diff --git a/fs/omfs/file.c b/fs/omfs/file.c
index 6e7a329..810cff3 100644
--- a/fs/omfs/file.c
+++ b/fs/omfs/file.c
@@ -312,9 +312,17 @@
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)
diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c
index 82a005c..9ca6627 100644
--- a/fs/sysv/itree.c
+++ b/fs/sysv/itree.c
@@ -468,9 +468,16 @@
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)
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 124852b..ecddcc2 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -127,9 +127,16 @@
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)
diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 45ce323..45cafa9 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -567,9 +567,17 @@
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)
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 7968d41..bf7aad0 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -1504,9 +1504,17 @@
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
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index accc9f8..3f69054 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -203,12 +203,8 @@
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 *,