9p: Define and implement TLINK for 9P2000.L
This patch adds a helper function to get the dentry from inode and uses it in creating a Hardlink SYNOPSIS size[4] Tlink tag[2] dfid[4] oldfid[4] newpath[s] size[4] Rlink tag[2] DESCRIPTION Create a link 'newpath' in directory pointed by dfid linking to oldfid path. [sripathik@in.ibm.com : p9_client_link should not free req structure if p9_client_rpc has returned an error.] Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen
parent
87d7845aa0
commit
09d34ee5f9
1 changed files with 106 additions and 1 deletions
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@ -235,6 +235,41 @@ void v9fs_destroy_inode(struct inode *inode)
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}
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}
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#endif
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#endif
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/**
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* v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
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* new file system object. This checks the S_ISGID to determine the owning
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* group of the new file system object.
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*/
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static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
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{
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BUG_ON(dir_inode == NULL);
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if (dir_inode->i_mode & S_ISGID) {
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/* set_gid bit is set.*/
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return dir_inode->i_gid;
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}
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return current_fsgid();
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}
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/**
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* v9fs_dentry_from_dir_inode - helper function to get the dentry from
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* dir inode.
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*
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*/
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struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
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{
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struct dentry *dentry;
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spin_lock(&dcache_lock);
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/* Directory should have only one entry. */
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BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
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dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
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spin_unlock(&dcache_lock);
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return dentry;
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}
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/**
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/**
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* v9fs_get_inode - helper function to setup an inode
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* v9fs_get_inode - helper function to setup an inode
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* @sb: superblock
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* @sb: superblock
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@ -1373,6 +1408,76 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
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return retval;
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return retval;
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}
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}
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/**
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* v9fs_vfs_link_dotl - create a hardlink for dotl
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* @old_dentry: dentry for file to link to
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* @dir: inode destination for new link
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* @dentry: dentry for link
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*
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*/
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static int
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v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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int err;
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struct p9_fid *dfid, *oldfid;
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char *name;
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struct v9fs_session_info *v9ses;
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struct dentry *dir_dentry;
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P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
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dir->i_ino, old_dentry->d_name.name,
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dentry->d_name.name);
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v9ses = v9fs_inode2v9ses(dir);
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dir_dentry = v9fs_dentry_from_dir_inode(dir);
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dfid = v9fs_fid_lookup(dir_dentry);
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if (IS_ERR(dfid))
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return PTR_ERR(dfid);
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oldfid = v9fs_fid_lookup(old_dentry);
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if (IS_ERR(oldfid))
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return PTR_ERR(oldfid);
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name = (char *) dentry->d_name.name;
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err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
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if (err < 0) {
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P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
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return err;
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}
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
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/* Get the latest stat info from server. */
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struct p9_fid *fid;
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struct p9_stat_dotl *st;
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fid = v9fs_fid_lookup(old_dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
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if (IS_ERR(st))
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return PTR_ERR(st);
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v9fs_stat2inode_dotl(st, old_dentry->d_inode);
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kfree(st);
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} else {
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/* Caching disabled. No need to get upto date stat info.
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* This dentry will be released immediately. So, just i_count++
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*/
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atomic_inc(&old_dentry->d_inode->i_count);
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}
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dentry->d_op = old_dentry->d_op;
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d_instantiate(dentry, old_dentry->d_inode);
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return err;
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}
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/**
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/**
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* v9fs_vfs_mknod - create a special file
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* v9fs_vfs_mknod - create a special file
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* @dir: inode destination for new link
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* @dir: inode destination for new link
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@ -1422,7 +1527,7 @@ static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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.create = v9fs_vfs_create,
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.create = v9fs_vfs_create,
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.lookup = v9fs_vfs_lookup,
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.lookup = v9fs_vfs_lookup,
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.symlink = v9fs_vfs_symlink,
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.symlink = v9fs_vfs_symlink,
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.link = v9fs_vfs_link,
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.link = v9fs_vfs_link_dotl,
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.unlink = v9fs_vfs_unlink,
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.unlink = v9fs_vfs_unlink,
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.mkdir = v9fs_vfs_mkdir,
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.mkdir = v9fs_vfs_mkdir,
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.rmdir = v9fs_vfs_rmdir,
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.rmdir = v9fs_vfs_rmdir,
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