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fs/9p: Add fid to inode in cached mode 

The fid attached to inode will be opened O_RDWR mode and is used
for dirty page writeback only.

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 17:03:57 +05:30 committed by Eric Van Hensbergen
parent 17311779ac
commit 3cf387d780
5 changed files with 83 additions and 3 deletions
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26
fs/9p/fid.c
View File

@ -261,3 +261,29 @@ struct p9_fid *v9fs_fid_clone(struct dentry *dentry)
ret = p9_client_walk(fid, 0, NULL, 1);
return ret;
}
struct p9_fid *v9fs_writeback_fid(struct dentry *dentry)
{
int err;
struct p9_fid *fid;
fid = v9fs_fid_clone(dentry);
if (IS_ERR(fid))
goto error_out;
/*
* writeback fid will only be used to write back the
* dirty pages. We always request for the open fid in read-write
* mode so that a partial page write which result in page
* read can work.
* FIXME!!: we should make the fid owned by uid = 0
*/
err = p9_client_open(fid, O_RDWR);
if (err < 0) {
p9_client_clunk(fid);
fid = ERR_PTR(err);
goto error_out;
}
error_out:
return fid;
}

1
fs/9p/fid.h
View File

@ -45,3 +45,4 @@ struct v9fs_dentry {
struct p9_fid *v9fs_fid_lookup(struct dentry *dentry);
struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);
struct p9_fid *v9fs_writeback_fid(struct dentry *dentry);

19
fs/9p/vfs_file.c
View File

@ -86,11 +86,30 @@ int v9fs_file_open(struct inode *inode, struct file *file)
}
file->private_data = fid;
if (v9ses->cache && !inode->i_private) {
/*
* clone a fid and add it to inode->i_private
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
fid = v9fs_writeback_fid(file->f_path.dentry);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
goto out_error;
}
inode->i_private = (void *) fid;
}
#ifdef CONFIG_9P_FSCACHE
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, file);
#endif
return 0;
out_error:
p9_client_clunk(file->private_data);
file->private_data = NULL;
return err;
}
/**

22
fs/9p/vfs_inode.c
View File

@ -417,6 +417,11 @@ 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;
}
}
struct inode *
@ -578,7 +583,7 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
u32 perm;
int flags;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
struct p9_fid *fid, *inode_fid;
struct file *filp;
err = 0;
@ -601,6 +606,21 @@ 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) {
/*
* clone a fid and add it to inode->i_private
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
inode_fid = v9fs_writeback_fid(dentry);
if (IS_ERR(inode_fid)) {
err = PTR_ERR(inode_fid);
goto error;
}
dentry->d_inode->i_private = (void *) inode_fid;
}
filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
if (IS_ERR(filp)) {
err = PTR_ERR(filp);

18
fs/9p/vfs_inode_dotl.c
View File

@ -142,7 +142,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
mode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL;
struct p9_fid *dfid, *ofid;
struct p9_fid *dfid, *ofid, *inode_fid;
struct file *filp;
struct p9_qid qid;
struct inode *inode;
@ -218,7 +218,21 @@ 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) {
/*
* clone a fid and add it to inode->i_private
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
inode_fid = v9fs_writeback_fid(dentry);
if (IS_ERR(inode_fid)) {
err = PTR_ERR(inode_fid);
goto error;
}
inode->i_private = (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);
if (IS_ERR(filp)) {