From 3cf387d780944305839f5b27c51f225444ba4d27 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Mon, 28 Feb 2011 17:03:57 +0530 Subject: [PATCH] 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 Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen --- fs/9p/fid.c | 26 ++++++++++++++++++++++++++ fs/9p/fid.h | 1 + fs/9p/vfs_file.c | 19 +++++++++++++++++++ fs/9p/vfs_inode.c | 22 +++++++++++++++++++++- fs/9p/vfs_inode_dotl.c | 18 ++++++++++++++++-- 5 files changed, 83 insertions(+), 3 deletions(-) diff --git a/fs/9p/fid.c b/fs/9p/fid.c index b00223c99d70..9d6a5d3bfe15 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -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; +} diff --git a/fs/9p/fid.h b/fs/9p/fid.h index c3bbd6af996d..c058f1c7656e 100644 --- a/fs/9p/fid.h +++ b/fs/9p/fid.h @@ -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); diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 6e1e8f43edac..e966f15f92ec 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -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; } /** diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 95f55011aca1..a0d65a398729 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -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); diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 265f5834498a..1327464bb2bb 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 +218,21 @@ 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)) { -- GitLab