From: Dominique Martinet Date: Sun, 12 Jun 2022 07:05:39 +0000 (+0900) Subject: 9p fid refcount: cleanup p9_fid_put calls X-Git-Tag: v6.1-rc5~675^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dafbe689736f62c696ac64809b17bdc752cfbe76;p=platform%2Fkernel%2Flinux-starfive.git 9p fid refcount: cleanup p9_fid_put calls Simplify p9_fid_put cleanup path in many 9p functions since the function is noop on null or error fids. Also make the *_add_fid() helpers "steal" the fid by nulling its pointer, so put after them will be noop. This should lead to no change of behaviour Link: https://lkml.kernel.org/r/20220612085330.1451496-7-asmadeus@codewreck.org Reviewed-by: Tyler Hicks Signed-off-by: Dominique Martinet --- diff --git a/fs/9p/fid.c b/fs/9p/fid.c index d792499..289a85e 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -31,11 +31,15 @@ static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid) * @fid: fid to add * */ -void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) +void v9fs_fid_add(struct dentry *dentry, struct p9_fid **pfid) { + struct p9_fid *fid = *pfid; + spin_lock(&dentry->d_lock); __add_fid(dentry, fid); spin_unlock(&dentry->d_lock); + + *pfid = NULL; } /** @@ -72,11 +76,15 @@ static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid) * */ -void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid) +void v9fs_open_fid_add(struct inode *inode, struct p9_fid **pfid) { + struct p9_fid *fid = *pfid; + spin_lock(&inode->i_lock); hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private); spin_unlock(&inode->i_lock); + + *pfid = NULL; } @@ -189,13 +197,13 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry, else uname = v9ses->uname; - root_fid = p9_client_attach(v9ses->clnt, NULL, uname, uid, - v9ses->aname); - if (IS_ERR(root_fid)) - return root_fid; + fid = p9_client_attach(v9ses->clnt, NULL, uname, uid, + v9ses->aname); + if (IS_ERR(fid)) + return fid; - p9_fid_get(root_fid); - v9fs_fid_add(dentry->d_sb->s_root, root_fid); + root_fid = p9_fid_get(fid); + v9fs_fid_add(dentry->d_sb->s_root, &fid); } /* If we are root ourself just return that */ if (dentry->d_sb->s_root == dentry) diff --git a/fs/9p/fid.h b/fs/9p/fid.h index 3168dfa..8a4e8cd 100644 --- a/fs/9p/fid.h +++ b/fs/9p/fid.h @@ -13,9 +13,9 @@ static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry) { return v9fs_fid_lookup(dentry->d_parent); } -void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid); +void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid); struct p9_fid *v9fs_writeback_fid(struct dentry *dentry); -void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid); +void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid); static inline struct p9_fid *clone_fid(struct p9_fid *fid) { return IS_ERR(fid) ? fid : p9_client_walk(fid, 0, NULL, 1); diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 8276f3a..aec43ba 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -69,9 +69,10 @@ int v9fs_file_open(struct inode *inode, struct file *file) if ((file->f_flags & O_APPEND) && (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) generic_file_llseek(file, 0, SEEK_END); + + file->private_data = fid; } - file->private_data = fid; mutex_lock(&v9inode->v_mutex); if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && !v9inode->writeback_fid && @@ -95,7 +96,7 @@ int v9fs_file_open(struct inode *inode, struct file *file) if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) fscache_use_cookie(v9fs_inode_cookie(v9inode), file->f_mode & FMODE_WRITE); - v9fs_open_fid_add(inode, fid); + v9fs_open_fid_add(inode, &fid); return 0; out_error: p9_fid_put(file->private_data); diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index bde1877..4d1a4a8 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -399,10 +399,8 @@ void v9fs_evict_inode(struct inode *inode) fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); /* clunk the fid stashed in writeback_fid */ - if (v9inode->writeback_fid) { - p9_fid_put(v9inode->writeback_fid); - v9inode->writeback_fid = NULL; - } + p9_fid_put(v9inode->writeback_fid); + v9inode->writeback_fid = NULL; } static int v9fs_test_inode(struct inode *inode, void *data) @@ -633,14 +631,12 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, if (IS_ERR(ofid)) { err = PTR_ERR(ofid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - p9_fid_put(dfid); - return ERR_PTR(err); + goto error; } err = p9_client_fcreate(ofid, name, perm, mode, extension); if (err < 0) { p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); - p9_fid_put(dfid); goto error; } @@ -651,8 +647,6 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, err = PTR_ERR(fid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - fid = NULL; - p9_fid_put(dfid); goto error; } /* @@ -663,21 +657,17 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, err = PTR_ERR(inode); p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); - p9_fid_put(dfid); goto error; } - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); d_instantiate(dentry, inode); } p9_fid_put(dfid); return ofid; error: - if (ofid) - p9_fid_put(ofid); - - if (fid) - p9_fid_put(fid); - + p9_fid_put(dfid); + p9_fid_put(ofid); + p9_fid_put(fid); return ERR_PTR(err); } @@ -804,9 +794,9 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, res = d_splice_alias(inode, dentry); if (!IS_ERR(fid)) { if (!res) - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); else if (!IS_ERR(res)) - v9fs_fid_add(res, fid); + v9fs_fid_add(res, &fid); else p9_fid_put(fid); } @@ -847,7 +837,6 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, v9fs_proto_dotu(v9ses))); if (IS_ERR(fid)) { err = PTR_ERR(fid); - fid = NULL; goto error; } @@ -882,7 +871,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) fscache_use_cookie(v9fs_inode_cookie(v9inode), file->f_mode & FMODE_WRITE); - v9fs_open_fid_add(inode, fid); + v9fs_open_fid_add(inode, &fid); file->f_mode |= FMODE_CREATED; out: @@ -890,8 +879,7 @@ out: return err; error: - if (fid) - p9_fid_put(fid); + p9_fid_put(fid); goto out; } @@ -939,9 +927,9 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, struct inode *old_inode; struct inode *new_inode; struct v9fs_session_info *v9ses; - struct p9_fid *oldfid, *dfid; - struct p9_fid *olddirfid; - struct p9_fid *newdirfid; + struct p9_fid *oldfid = NULL, *dfid = NULL; + struct p9_fid *olddirfid = NULL; + struct p9_fid *newdirfid = NULL; struct p9_wstat wstat; if (flags) @@ -958,21 +946,22 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, dfid = v9fs_parent_fid(old_dentry); olddirfid = clone_fid(dfid); - if (dfid && !IS_ERR(dfid)) - p9_fid_put(dfid); + p9_fid_put(dfid); + dfid = NULL; if (IS_ERR(olddirfid)) { retval = PTR_ERR(olddirfid); - goto done; + goto error; } dfid = v9fs_parent_fid(new_dentry); newdirfid = clone_fid(dfid); p9_fid_put(dfid); + dfid = NULL; if (IS_ERR(newdirfid)) { retval = PTR_ERR(newdirfid); - goto clunk_olddir; + goto error; } down_write(&v9ses->rename_sem); @@ -983,7 +972,7 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, retval = p9_client_rename(oldfid, newdirfid, new_dentry->d_name.name); if (retval != -EOPNOTSUPP) - goto clunk_newdir; + goto error_locked; } if (old_dentry->d_parent != new_dentry->d_parent) { /* @@ -992,14 +981,14 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); retval = -EXDEV; - goto clunk_newdir; + goto error_locked; } v9fs_blank_wstat(&wstat); wstat.muid = v9ses->uname; wstat.name = new_dentry->d_name.name; retval = p9_client_wstat(oldfid, &wstat); -clunk_newdir: +error_locked: if (!retval) { if (new_inode) { if (S_ISDIR(new_inode->i_mode)) @@ -1020,12 +1009,10 @@ clunk_newdir: d_move(old_dentry, new_dentry); } up_write(&v9ses->rename_sem); - p9_fid_put(newdirfid); -clunk_olddir: +error: + p9_fid_put(newdirfid); p9_fid_put(olddirfid); - -done: p9_fid_put(oldfid); return retval; } diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 09b124f..5cfa4b4 100644 --- a/fs/9p/vfs_inode_dotl.c +++ b/fs/9p/vfs_inode_dotl.c @@ -238,7 +238,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, struct inode *inode; struct p9_fid *fid = NULL; struct v9fs_inode *v9inode; - struct p9_fid *dfid, *ofid, *inode_fid; + struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL; struct v9fs_session_info *v9ses; struct posix_acl *pacl = NULL, *dacl = NULL; struct dentry *res = NULL; @@ -274,7 +274,6 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, if (IS_ERR(ofid)) { err = PTR_ERR(ofid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - p9_fid_put(dfid); goto out; } @@ -286,38 +285,34 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, if (err) { p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", err); - p9_fid_put(dfid); - goto error; + goto out; } err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), mode, gid, &qid); if (err < 0) { p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", err); - p9_fid_put(dfid); - goto error; + goto out; } v9fs_invalidate_inode_attr(dir); /* instantiate inode and assign the unopened fid to the dentry */ fid = p9_client_walk(dfid, 1, &name, 1); - p9_fid_put(dfid); if (IS_ERR(fid)) { err = PTR_ERR(fid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - fid = NULL; - goto error; + goto out; } inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); if (IS_ERR(inode)) { err = PTR_ERR(inode); p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); - goto error; + goto out; } /* Now set the ACL based on the default value */ v9fs_set_create_acl(inode, fid, dacl, pacl); - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); d_instantiate(dentry, inode); v9inode = V9FS_I(inode); @@ -336,7 +331,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, if (IS_ERR(inode_fid)) { err = PTR_ERR(inode_fid); mutex_unlock(&v9inode->v_mutex); - goto err_clunk_old_fid; + goto out; } v9inode->writeback_fid = (void *) inode_fid; } @@ -344,25 +339,20 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, /* Since we are opening a file, assign the open fid to the file */ err = finish_open(file, dentry, generic_file_open); if (err) - goto err_clunk_old_fid; + goto out; file->private_data = ofid; if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) fscache_use_cookie(v9fs_inode_cookie(v9inode), file->f_mode & FMODE_WRITE); - v9fs_open_fid_add(inode, ofid); + v9fs_open_fid_add(inode, &ofid); file->f_mode |= FMODE_CREATED; out: + p9_fid_put(dfid); + p9_fid_put(ofid); + p9_fid_put(fid); v9fs_put_acl(dacl, pacl); dput(res); return err; - -error: - if (fid) - p9_fid_put(fid); -err_clunk_old_fid: - if (ofid) - p9_fid_put(ofid); - goto out; } /** @@ -400,7 +390,6 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, if (IS_ERR(dfid)) { err = PTR_ERR(dfid); p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); - dfid = NULL; goto error; } @@ -422,7 +411,6 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, err = PTR_ERR(fid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - fid = NULL; goto error; } @@ -435,10 +423,9 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, err); goto error; } - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); v9fs_set_create_acl(inode, fid, dacl, pacl); d_instantiate(dentry, inode); - fid = NULL; err = 0; } else { /* @@ -457,8 +444,7 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, inc_nlink(dir); v9fs_invalidate_inode_attr(dir); error: - if (fid) - p9_fid_put(fid); + p9_fid_put(fid); v9fs_put_acl(dacl, pacl); p9_fid_put(dfid); return err; @@ -743,7 +729,6 @@ v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir, err = PTR_ERR(fid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - fid = NULL; goto error; } @@ -755,9 +740,8 @@ v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir, err); goto error; } - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); d_instantiate(dentry, inode); - fid = NULL; err = 0; } else { /* Not in cached mode. No need to populate inode with stat */ @@ -770,9 +754,7 @@ v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir, } error: - if (fid) - p9_fid_put(fid); - + p9_fid_put(fid); p9_fid_put(dfid); return err; } @@ -866,7 +848,6 @@ v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, if (IS_ERR(dfid)) { err = PTR_ERR(dfid); p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); - dfid = NULL; goto error; } @@ -891,7 +872,6 @@ v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, err = PTR_ERR(fid); p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); - fid = NULL; goto error; } @@ -905,9 +885,8 @@ v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, goto error; } v9fs_set_create_acl(inode, fid, dacl, pacl); - v9fs_fid_add(dentry, fid); + v9fs_fid_add(dentry, &fid); d_instantiate(dentry, inode); - fid = NULL; err = 0; } else { /* @@ -923,8 +902,7 @@ v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, d_instantiate(dentry, inode); } error: - if (fid) - p9_fid_put(fid); + p9_fid_put(fid); v9fs_put_acl(dacl, pacl); p9_fid_put(dfid); diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c index bf350fa..2d9ee07 100644 --- a/fs/9p/vfs_super.c +++ b/fs/9p/vfs_super.c @@ -184,7 +184,7 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags, retval = v9fs_get_acl(inode, fid); if (retval) goto release_sb; - v9fs_fid_add(root, fid); + v9fs_fid_add(root, &fid); p9_debug(P9_DEBUG_VFS, " simple set mount, return 0\n"); return dget(sb->s_root);