clean up write_begin usage for directories in pagecache
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>
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index 1dbf921..085a926 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -271,8 +271,7 @@
got_it:
pos = page_offset(page) + p - (char *)page_address(page);
- err = __minix_write_begin(NULL, page->mapping, pos, sbi->s_dirsize,
- AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+ err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
if (err)
goto out_unlock;
memcpy (namx, name, namelen);
@@ -297,8 +296,7 @@
int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
{
- struct address_space *mapping = page->mapping;
- struct inode *inode = (struct inode*)mapping->host;
+ struct inode *inode = page->mapping->host;
char *kaddr = page_address(page);
loff_t pos = page_offset(page) + (char*)de - kaddr;
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
@@ -306,8 +304,7 @@
int err;
lock_page(page);
- err = __minix_write_begin(NULL, mapping, pos, len,
- AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+ err = minix_prepare_chunk(page, pos, len);
if (err == 0) {
if (sbi->s_version == MINIX_V3)
((minix3_dirent *) de)->inode = 0;
@@ -325,16 +322,14 @@
int minix_make_empty(struct inode *inode, struct inode *dir)
{
- struct address_space *mapping = inode->i_mapping;
- struct page *page = grab_cache_page(mapping, 0);
+ struct page *page = grab_cache_page(inode->i_mapping, 0);
struct minix_sb_info *sbi = minix_sb(inode->i_sb);
char *kaddr;
int err;
if (!page)
return -ENOMEM;
- err = __minix_write_begin(NULL, mapping, 0, 2 * sbi->s_dirsize,
- AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+ err = minix_prepare_chunk(page, 0, 2 * sbi->s_dirsize);
if (err) {
unlock_page(page);
goto fail;
@@ -425,8 +420,7 @@
void minix_set_link(struct minix_dir_entry *de, struct page *page,
struct inode *inode)
{
- struct address_space *mapping = page->mapping;
- struct inode *dir = mapping->host;
+ struct inode *dir = page->mapping->host;
struct minix_sb_info *sbi = minix_sb(dir->i_sb);
loff_t pos = page_offset(page) +
(char *)de-(char*)page_address(page);
@@ -434,8 +428,7 @@
lock_page(page);
- err = __minix_write_begin(NULL, mapping, pos, sbi->s_dirsize,
- AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+ err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
if (err == 0) {
if (sbi->s_version == MINIX_V3)
((minix3_dirent *) de)->inode = inode->i_ino;
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index 756f8c9..f4abe45 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -357,12 +357,10 @@
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 @@
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)
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index 111f34e..407b1c8 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -53,9 +53,7 @@
extern void minix_free_block(struct inode *inode, unsigned long block);
extern unsigned long minix_count_free_blocks(struct minix_sb_info *sbi);
extern int minix_getattr(struct vfsmount *, struct dentry *, struct kstat *);
-extern int __minix_write_begin(struct file *file, struct address_space *mapping,
- loff_t pos, unsigned len, unsigned flags,
- struct page **pagep, void **fsdata);
+extern int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len);
extern void V1_minix_truncate(struct inode *);
extern void V2_minix_truncate(struct inode *);