// SPDX-License-Identifier: GPL-2.0-only /* * V9FS FID Management * * Copyright (C) 2007 by Latchesar Ionkov * Copyright (C) 2005, 2006 by Eric Van Hensbergen */ #include #include #include #include #include #include #include #include #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid) { hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata); } /** * v9fs_fid_add - add a fid to a dentry * @dentry: dentry that the fid is being added to * @fid: fid to add * */ void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) { spin_lock(&dentry->d_lock); __add_fid(dentry, fid); spin_unlock(&dentry->d_lock); } /** * v9fs_fid_find_inode - search for an open fid off of the inode list * @inode: return a fid pointing to a specific inode * @uid: return a fid belonging to the specified user * */ static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid) { struct hlist_head *h; struct p9_fid *fid, *ret = NULL; p9_debug(P9_DEBUG_VFS, " inode: %p\n", inode); spin_lock(&inode->i_lock); h = (struct hlist_head *)&inode->i_private; hlist_for_each_entry(fid, h, ilist) { if (uid_eq(fid->uid, uid)) { refcount_inc(&fid->count); ret = fid; break; } } spin_unlock(&inode->i_lock); return ret; } /** * v9fs_open_fid_add - add an open fid to an inode * @inode: inode that the fid is being added to * @fid: fid to add * */ void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid) { spin_lock(&inode->i_lock); hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private); spin_unlock(&inode->i_lock); } /** * v9fs_fid_find - retrieve a fid that belongs to the specified uid * @dentry: dentry to look for fid in * @uid: return fid that belongs to the specified user * @any: if non-zero, return any fid associated with the dentry * */ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any) { struct p9_fid *fid, *ret; p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p) uid %d any %d\n", dentry, dentry, from_kuid(&init_user_ns, uid), any); ret = NULL; /* we'll recheck under lock if there's anything to look in */ if (dentry->d_fsdata) { struct hlist_head *h = (struct hlist_head *)&dentry->d_fsdata; spin_lock(&dentry->d_lock); hlist_for_each_entry(fid, h, dlist) { if (any || uid_eq(fid->uid, uid)) { ret = fid; refcount_inc(&ret->count); break; } } spin_unlock(&dentry->d_lock); } else { if (dentry->d_inode) ret = v9fs_fid_find_inode(dentry->d_inode, uid); } return ret; } /* * We need to hold v9ses->rename_sem as long as we hold references * to returned path array. Array element contain pointers to * dentry names. */ static int build_path_from_dentry(struct v9fs_session_info *v9ses, struct dentry *dentry, const unsigned char ***names) { int n = 0, i; const unsigned char **wnames; struct dentry *ds; for (ds = dentry; !IS_ROOT(ds); ds = ds->d_parent) n++; wnames = kmalloc_array(n, sizeof(char *), GFP_KERNEL); if (!wnames) goto err_out; for (ds = dentry, i = (n-1); i >= 0; i--, ds = ds->d_parent) wnames[i] = ds->d_name.name; *names = wnames; return n; err_out: return -ENOMEM; } static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry, kuid_t uid, int any) { struct dentry *ds; const unsigned char **wnames, *uname; int i, n, l, clone, access; struct v9fs_session_info *v9ses; struct p9_fid *fid, *root_fid, *old_fid; v9ses = v9fs_dentry2v9ses(dentry); access = v9ses->flags & V9FS_ACCESS_MASK; fid = v9fs_fid_find(dentry, uid, any); if (fid) return fid; /* * we don't have a matching fid. To do a TWALK we need * parent fid. We need to prevent rename when we want to * look at the parent. */ down_read(&v9ses->rename_sem); ds = dentry->d_parent; fid = v9fs_fid_find(ds, uid, any); if (fid) { /* Found the parent fid do a lookup with that */ struct p9_fid *ofid = fid; fid = p9_client_walk(ofid, 1, &dentry->d_name.name, 1); p9_client_clunk(ofid); goto fid_out; } up_read(&v9ses->rename_sem); /* start from the root and try to do a lookup */ root_fid = v9fs_fid_find(dentry->d_sb->s_root, uid, any); if (!root_fid) { /* the user is not attached to the fs yet */ if (access == V9FS_ACCESS_SINGLE) return ERR_PTR(-EPERM); if (v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) uname = NULL; else uname = v9ses->uname; root_fid = p9_client_attach(v9ses->clnt, NULL, uname, uid, v9ses->aname); if (IS_ERR(root_fid)) return root_fid; refcount_inc(&root_fid->count); v9fs_fid_add(dentry->d_sb->s_root, root_fid); } /* If we are root ourself just return that */ if (dentry->d_sb->s_root == dentry) return root_fid; /* * Do a multipath walk with attached root. * When walking parent we need to make sure we * don't have a parallel rename happening */ down_read(&v9ses->rename_sem); n = build_path_from_dentry(v9ses, dentry, &wnames); if (n < 0) { fid = ERR_PTR(n); goto err_out; } fid = root_fid; old_fid = root_fid; clone = 1; i = 0; while (i < n) { l = min(n - i, P9_MAXWELEM); /* * We need to hold rename lock when doing a multipath * walk to ensure none of the patch component change */ fid = p9_client_walk(old_fid, l, &wnames[i], clone); /* non-cloning walk will return the same fid */ if (fid != old_fid) { p9_client_clunk(old_fid); old_fid = fid; } if (IS_ERR(fid)) { kfree(wnames); goto err_out; } i += l; clone = 0; } kfree(wnames); fid_out: if (!IS_ERR(fid)) { spin_lock(&dentry->d_lock); if (d_unhashed(dentry)) { spin_unlock(&dentry->d_lock); p9_client_clunk(fid); fid = ERR_PTR(-ENOENT); } else { __add_fid(dentry, fid); refcount_inc(&fid->count); spin_unlock(&dentry->d_lock); } } err_out: up_read(&v9ses->rename_sem); return fid; } /** * v9fs_fid_lookup - lookup for a fid, try to walk if not found * @dentry: dentry to look for fid in * * Look for a fid in the specified dentry for the current user. * If no fid is found, try to create one walking from a fid from the parent * dentry (if it has one), or the root dentry. If the user haven't accessed * the fs yet, attach now and walk from the root. */ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry) { kuid_t uid; int any, access; struct v9fs_session_info *v9ses; v9ses = v9fs_dentry2v9ses(dentry); access = v9ses->flags & V9FS_ACCESS_MASK; switch (access) { case V9FS_ACCESS_SINGLE: case V9FS_ACCESS_USER: case V9FS_ACCESS_CLIENT: uid = current_fsuid(); any = 0; break; case V9FS_ACCESS_ANY: uid = v9ses->uid; any = 1; break; default: uid = INVALID_UID; any = 0; break; } return v9fs_fid_lookup_with_uid(dentry, uid, any); } struct p9_fid *v9fs_writeback_fid(struct dentry *dentry) { int err; struct p9_fid *fid, *ofid; ofid = v9fs_fid_lookup_with_uid(dentry, GLOBAL_ROOT_UID, 0); fid = clone_fid(ofid); if (IS_ERR(fid)) goto error_out; p9_client_clunk(ofid); /* * 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. */ 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; }