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fs/9p: Move writeback fid to v9fs_inode

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Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V 2011-02-28 17:04:03 +05:30 committed by Eric Van Hensbergen
parent a78ce05d5d
commit 6b39f6d22f
5 changed files with 41 additions and 24 deletions
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1
fs/9p/v9fs.h
View File

@ -122,6 +122,7 @@ struct v9fs_inode {
struct fscache_cookie *fscache;
struct p9_qid *fscache_key;
#endif
struct p9_fid *writeback_fid;
struct inode vfs_inode;
};

14
fs/9p/vfs_addr.c
View File

@ -163,8 +163,10 @@ static int v9fs_vfs_writepage_locked(struct page *page)
int retval, len;
loff_t offset, size;
mm_segment_t old_fs;
struct v9fs_inode *v9inode;
struct inode *inode = page->mapping->host;
v9inode = V9FS_I(inode);
size = i_size_read(inode);
if (page->index == size >> PAGE_CACHE_SHIFT)
len = size & ~PAGE_CACHE_MASK;
@ -178,11 +180,11 @@ static int v9fs_vfs_writepage_locked(struct page *page)
old_fs = get_fs();
set_fs(get_ds());
/* We should have i_private always set */
BUG_ON(!inode->i_private);
/* We should have writeback_fid always set */
BUG_ON(!v9inode->writeback_fid);
retval = v9fs_file_write_internal(inode,
(struct p9_fid *)inode->i_private,
v9inode->writeback_fid,
(__force const char __user *)buffer,
len, &offset, 0);
if (retval > 0)
@ -274,23 +276,25 @@ static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
{
int retval = 0;
struct page *page;
struct v9fs_inode *v9inode;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
struct inode *inode = mapping->host;
v9inode = V9FS_I(inode);
start:
page = grab_cache_page_write_begin(mapping, index, flags);
if (!page) {
retval = -ENOMEM;
goto out;
}
BUG_ON(!inode->i_private);
BUG_ON(!v9inode->writeback_fid);
if (PageUptodate(page))
goto out;
if (len == PAGE_CACHE_SIZE)
goto out;
retval = v9fs_fid_readpage(inode->i_private, page);
retval = v9fs_fid_readpage(v9inode->writeback_fid, page);
page_cache_release(page);
if (!retval)
goto start;

12
fs/9p/vfs_file.c
View File

@ -56,11 +56,13 @@ static const struct vm_operations_struct v9fs_file_vm_ops;
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
v9inode = V9FS_I(inode);
v9ses = v9fs_inode2v9ses(inode);
if (v9fs_proto_dotl(v9ses))
omode = file->f_flags;
@ -88,9 +90,9 @@ int v9fs_file_open(struct inode *inode, struct file *file)
}
file->private_data = fid;
if (v9ses->cache && !inode->i_private) {
if (v9ses->cache && !v9inode->writeback_fid) {
/*
* clone a fid and add it to inode->i_private
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
@ -101,7 +103,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
err = PTR_ERR(fid);
goto out_error;
}
inode->i_private = (void *) fid;
v9inode->writeback_fid = (void *) fid;
}
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache)
@ -550,6 +552,7 @@ v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
static int
v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct v9fs_inode *v9inode;
struct page *page = vmf->page;
struct file *filp = vma->vm_file;
struct inode *inode = filp->f_path.dentry->d_inode;
@ -558,9 +561,10 @@ v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
page, (unsigned long)filp->private_data);
v9inode = V9FS_I(inode);
/* make sure the cache has finished storing the page */
v9fs_fscache_wait_on_page_write(inode, page);
BUG_ON(!inode->i_private);
BUG_ON(!v9inode->writeback_fid);
lock_page(page);
if (page->mapping != inode->i_mapping)
goto out_unlock;

21
fs/9p/vfs_inode.c
View File

@ -219,6 +219,7 @@ struct inode *v9fs_alloc_inode(struct super_block *sb)
v9inode->fscache_key = NULL;
spin_lock_init(&v9inode->fscache_lock);
#endif
v9inode->writeback_fid = NULL;
return &v9inode->vfs_inode;
}
@ -414,6 +415,8 @@ error:
*/
void v9fs_evict_inode(struct inode *inode)
{
struct v9fs_inode *v9inode = V9FS_I(inode);
truncate_inode_pages(inode->i_mapping, 0);
end_writeback(inode);
filemap_fdatawrite(inode->i_mapping);
@ -421,10 +424,10 @@ void v9fs_evict_inode(struct inode *inode)
#ifdef CONFIG_9P_FSCACHE
v9fs_cache_inode_put_cookie(inode);
#endif
/* clunk the fid stashed in inode->i_private */
if (inode->i_private) {
p9_client_clunk((struct p9_fid *)inode->i_private);
inode->i_private = NULL;
/* clunk the fid stashed in writeback_fid */
if (v9inode->writeback_fid) {
p9_client_clunk(v9inode->writeback_fid);
v9inode->writeback_fid = NULL;
}
}
@ -607,9 +610,10 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
int err;
u32 perm;
int flags;
struct file *filp;
struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid, *inode_fid;
struct file *filp;
err = 0;
fid = NULL;
@ -631,9 +635,10 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
/* if we are opening a file, assign the open fid to the file */
if (nd && nd->flags & LOOKUP_OPEN) {
if (v9ses->cache && !dentry->d_inode->i_private) {
v9inode = V9FS_I(dentry->d_inode);
if (v9ses->cache && !v9inode->writeback_fid) {
/*
* clone a fid and add it to inode->i_private
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
@ -644,7 +649,7 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
err = PTR_ERR(inode_fid);
goto error;
}
dentry->d_inode->i_private = (void *) inode_fid;
v9inode->writeback_fid = (void *) inode_fid;
}
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
if (IS_ERR(filp)) {

17
fs/9p/vfs_inode_dotl.c
View File

@ -159,16 +159,17 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
struct nameidata *nd)
{
int err = 0;
char *name = NULL;
gid_t gid;
int flags;
mode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL;
struct p9_fid *dfid, *ofid, *inode_fid;
char *name = NULL;
struct file *filp;
struct p9_qid qid;
struct inode *inode;
struct p9_fid *fid = NULL;
struct v9fs_inode *v9inode;
struct p9_fid *dfid, *ofid, *inode_fid;
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
v9ses = v9fs_inode2v9ses(dir);
@ -241,9 +242,11 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, dacl, pacl);
if (v9ses->cache && !inode->i_private) {
v9inode = V9FS_I(inode);
if (v9ses->cache && !v9inode->writeback_fid) {
/*
* clone a fid and add it to inode->i_private
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
@ -254,7 +257,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
err = PTR_ERR(inode_fid);
goto error;
}
inode->i_private = (void *) inode_fid;
v9inode->writeback_fid = (void *) inode_fid;
}
/* Since we are opening a file, assign the open fid to the file */
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);