openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

nfs: convert to new aops 

[akpm@linux-foundation.org: fix against git-nfs]
[peterz@infradead.org: fix against git-nfs]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2007-10-16 01:25:16 -07:00 committed by Linus Torvalds
parent a20fa20c54
commit 4899f9c852
1 changed files with 60 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
fs/nfs/file.c
View File

@ -306,27 +306,50 @@ nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
}
/*
* This does the "real" work of the write. The generic routine has
* allocated the page, locked it, done all the page alignment stuff
* calculations etc. Now we should just copy the data from user
* space and write it back to the real medium..
* This does the "real" work of the write. We must allocate and lock the
* page to be sent back to the generic routine, which then copies the
* data from user space.
*
* If the writer ends up delaying the write, the writer needs to
* increment the page use counts until he is done with the page.
*/
static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
static int nfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
return nfs_flush_incompatible(file, page);
int ret;
pgoff_t index;
struct page *page;
index = pos >> PAGE_CACHE_SHIFT;
page = __grab_cache_page(mapping, index);
if (!page)
return -ENOMEM;
*pagep = page;
ret = nfs_flush_incompatible(file, page);
if (ret) {
unlock_page(page);
page_cache_release(page);
}
return ret;
}
static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
static int nfs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
long status;
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
int status;
lock_kernel();
status = nfs_updatepage(file, page, offset, to-offset);
status = nfs_updatepage(file, page, offset, copied);
unlock_kernel();
return status;
unlock_page(page);
page_cache_release(page);
return status < 0 ? status : copied;
}
static void nfs_invalidate_page(struct page *page, unsigned long offset)
@ -354,8 +377,8 @@ const struct address_space_operations nfs_file_aops = {
.set_page_dirty = __set_page_dirty_nobuffers,
.writepage = nfs_writepage,
.writepages = nfs_writepages,
.prepare_write = nfs_prepare_write,
.commit_write = nfs_commit_write,
.write_begin = nfs_write_begin,
.write_end = nfs_write_end,
.invalidatepage = nfs_invalidate_page,
.releasepage = nfs_release_page,
#ifdef CONFIG_NFS_DIRECTIO
@ -369,18 +392,35 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
struct file *filp = vma->vm_file;
unsigned pagelen;
int ret = -EINVAL;
void *fsdata;
struct address_space *mapping;
loff_t offset;
lock_page(page);
if (page->mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping)
goto out_unlock;
mapping = page->mapping;
if (mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping) {
unlock_page(page);
return -EINVAL;
}
pagelen = nfs_page_length(page);
if (pagelen == 0)
goto out_unlock;
ret = nfs_prepare_write(filp, page, 0, pagelen);
if (!ret)
ret = nfs_commit_write(filp, page, 0, pagelen);
out_unlock:
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
unlock_page(page);
/*
* we can use mapping after releasing the page lock, because:
* we hold mmap_sem on the fault path, which should pin the vma
* which should pin the file, which pins the dentry which should
* hold a reference on inode.
*/
if (pagelen) {
struct page *page2 = NULL;
ret = nfs_write_begin(filp, mapping, offset, pagelen,
0, &page2, &fsdata);
if (!ret)
ret = nfs_write_end(filp, mapping, offset, pagelen,
pagelen, page2, fsdata);
}
return ret;
}