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Subject[RFC PATCH -V1 6/7] fs/9p: Add fid to inode in cached mode
Date
The fid attached to inode will be opened O_RDWR mode and is used
for dirty page writeback only.

FIXME!!: Should we make the fid owned by uid = 0

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/vfs_file.c | 31 +++++++++++++++++++++++++++++++
fs/9p/vfs_inode.c | 34 +++++++++++++++++++++++++++++++++-
fs/9p/vfs_inode_dotl.c | 30 ++++++++++++++++++++++++++++--
3 files changed, 92 insertions(+), 3 deletions(-)
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index ecdd512..0f62b26 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -86,11 +86,42 @@ int v9fs_file_open(struct inode *inode, struct file *file)
}

file->private_data = fid;
+ /*
+ * In cached mode we need to attach a fid to inode. The fid
+ * attached to inode 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.
+ */
+ 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_fid_clone(file->f_path.dentry);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ goto out_error;
+ }
+ err = p9_client_open(fid, O_RDWR);
+ if (err < 0) {
+ p9_client_clunk(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 = 0;
+ return err;
}

/**
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index b6b939b..908fa08 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -416,6 +416,11 @@ 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 = 0;
+ }
}

struct inode *
@@ -577,7 +582,7 @@ 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;
@@ -600,6 +605,33 @@ 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) {
+ /*
+ * In cached mode we need to attach a fid to inode. The fid
+ * attached to inode 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.
+ */
+ 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_fid_clone(dentry);
+ if (IS_ERR(inode_fid)) {
+ err = PTR_ERR(inode_fid);
+ goto error;
+ }
+ err = p9_client_open(inode_fid, O_RDWR);
+ if (err < 0) {
+ p9_client_clunk(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);
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 265f583..d5aa986 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -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 +218,33 @@ 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);
-
+ /*
+ * In cached mode we need to attach a fid to inode. The fid
+ * attached to inode 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.
+ */
+ 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_fid_clone(dentry);
+ if (IS_ERR(inode_fid)) {
+ err = PTR_ERR(inode_fid);
+ goto error;
+ }
+ err = p9_client_open(inode_fid, O_RDWR);
+ if (err < 0) {
+ p9_client_clunk(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)) {
--
1.7.1


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