forked from Minki/linux
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 <tyhicks@linux.microsoft.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
This commit is contained in:
Dominique Martinet
Dominique Martinet
parent
286c171b86
commit
dafbe68973
24
fs/9p/fid.c
24
fs/9p/fid.c
@ -31,11 +31,15 @@ static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid)
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* @fid: fid to add
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*
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*/
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid **pfid)
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{
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struct p9_fid *fid = *pfid;
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spin_lock(&dentry->d_lock);
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__add_fid(dentry, fid);
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spin_unlock(&dentry->d_lock);
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*pfid = NULL;
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}
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/**
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@ -72,11 +76,15 @@ static struct p9_fid *v9fs_fid_find_inode(struct inode *inode, kuid_t uid)
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*
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*/
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void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid)
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void v9fs_open_fid_add(struct inode *inode, struct p9_fid **pfid)
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{
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struct p9_fid *fid = *pfid;
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spin_lock(&inode->i_lock);
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hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private);
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spin_unlock(&inode->i_lock);
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*pfid = NULL;
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}
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@ -189,13 +197,13 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
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else
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uname = v9ses->uname;
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root_fid = p9_client_attach(v9ses->clnt, NULL, uname, uid,
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v9ses->aname);
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if (IS_ERR(root_fid))
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return root_fid;
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fid = p9_client_attach(v9ses->clnt, NULL, uname, uid,
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v9ses->aname);
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if (IS_ERR(fid))
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return fid;
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p9_fid_get(root_fid);
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v9fs_fid_add(dentry->d_sb->s_root, root_fid);
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root_fid = p9_fid_get(fid);
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v9fs_fid_add(dentry->d_sb->s_root, &fid);
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}
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/* If we are root ourself just return that */
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if (dentry->d_sb->s_root == dentry)
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@ -13,9 +13,9 @@ static inline struct p9_fid *v9fs_parent_fid(struct dentry *dentry)
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{
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return v9fs_fid_lookup(dentry->d_parent);
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}
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid **fid);
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struct p9_fid *v9fs_writeback_fid(struct dentry *dentry);
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void v9fs_open_fid_add(struct inode *inode, struct p9_fid *fid);
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void v9fs_open_fid_add(struct inode *inode, struct p9_fid **fid);
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static inline struct p9_fid *clone_fid(struct p9_fid *fid)
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{
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return IS_ERR(fid) ? fid : p9_client_walk(fid, 0, NULL, 1);
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@ -69,9 +69,10 @@ int v9fs_file_open(struct inode *inode, struct file *file)
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if ((file->f_flags & O_APPEND) &&
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(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
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generic_file_llseek(file, 0, SEEK_END);
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file->private_data = fid;
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}
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file->private_data = fid;
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mutex_lock(&v9inode->v_mutex);
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if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
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!v9inode->writeback_fid &&
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@ -95,7 +96,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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fscache_use_cookie(v9fs_inode_cookie(v9inode),
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file->f_mode & FMODE_WRITE);
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v9fs_open_fid_add(inode, fid);
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v9fs_open_fid_add(inode, &fid);
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return 0;
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out_error:
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p9_fid_put(file->private_data);
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@ -399,10 +399,8 @@ void v9fs_evict_inode(struct inode *inode)
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fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
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/* clunk the fid stashed in writeback_fid */
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if (v9inode->writeback_fid) {
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p9_fid_put(v9inode->writeback_fid);
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v9inode->writeback_fid = NULL;
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}
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p9_fid_put(v9inode->writeback_fid);
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v9inode->writeback_fid = NULL;
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}
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static int v9fs_test_inode(struct inode *inode, void *data)
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@ -633,14 +631,12 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
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if (IS_ERR(ofid)) {
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err = PTR_ERR(ofid);
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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p9_fid_put(dfid);
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return ERR_PTR(err);
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goto error;
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}
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err = p9_client_fcreate(ofid, name, perm, mode, extension);
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if (err < 0) {
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p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
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p9_fid_put(dfid);
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goto error;
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}
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@ -651,8 +647,6 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
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err = PTR_ERR(fid);
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p9_debug(P9_DEBUG_VFS,
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"p9_client_walk failed %d\n", err);
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fid = NULL;
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p9_fid_put(dfid);
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goto error;
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}
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/*
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@ -663,21 +657,17 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS,
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"inode creation failed %d\n", err);
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p9_fid_put(dfid);
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goto error;
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}
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v9fs_fid_add(dentry, fid);
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v9fs_fid_add(dentry, &fid);
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d_instantiate(dentry, inode);
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}
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p9_fid_put(dfid);
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return ofid;
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error:
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if (ofid)
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p9_fid_put(ofid);
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if (fid)
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p9_fid_put(fid);
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p9_fid_put(dfid);
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p9_fid_put(ofid);
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p9_fid_put(fid);
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return ERR_PTR(err);
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}
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@ -804,9 +794,9 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
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res = d_splice_alias(inode, dentry);
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if (!IS_ERR(fid)) {
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if (!res)
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v9fs_fid_add(dentry, fid);
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v9fs_fid_add(dentry, &fid);
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else if (!IS_ERR(res))
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v9fs_fid_add(res, fid);
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v9fs_fid_add(res, &fid);
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else
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p9_fid_put(fid);
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}
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@ -847,7 +837,6 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
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v9fs_proto_dotu(v9ses)));
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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fid = NULL;
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goto error;
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}
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@ -882,7 +871,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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fscache_use_cookie(v9fs_inode_cookie(v9inode),
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file->f_mode & FMODE_WRITE);
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v9fs_open_fid_add(inode, fid);
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v9fs_open_fid_add(inode, &fid);
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file->f_mode |= FMODE_CREATED;
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out:
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@ -890,8 +879,7 @@ out:
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return err;
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error:
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if (fid)
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p9_fid_put(fid);
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p9_fid_put(fid);
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goto out;
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}
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@ -939,9 +927,9 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
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struct inode *old_inode;
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struct inode *new_inode;
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struct v9fs_session_info *v9ses;
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struct p9_fid *oldfid, *dfid;
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struct p9_fid *olddirfid;
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struct p9_fid *newdirfid;
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struct p9_fid *oldfid = NULL, *dfid = NULL;
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struct p9_fid *olddirfid = NULL;
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struct p9_fid *newdirfid = NULL;
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struct p9_wstat wstat;
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if (flags)
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@ -958,21 +946,22 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
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dfid = v9fs_parent_fid(old_dentry);
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olddirfid = clone_fid(dfid);
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if (dfid && !IS_ERR(dfid))
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p9_fid_put(dfid);
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p9_fid_put(dfid);
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dfid = NULL;
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if (IS_ERR(olddirfid)) {
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retval = PTR_ERR(olddirfid);
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goto done;
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goto error;
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}
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dfid = v9fs_parent_fid(new_dentry);
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newdirfid = clone_fid(dfid);
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p9_fid_put(dfid);
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dfid = NULL;
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if (IS_ERR(newdirfid)) {
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retval = PTR_ERR(newdirfid);
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goto clunk_olddir;
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goto error;
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}
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down_write(&v9ses->rename_sem);
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@ -983,7 +972,7 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
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retval = p9_client_rename(oldfid, newdirfid,
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new_dentry->d_name.name);
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if (retval != -EOPNOTSUPP)
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goto clunk_newdir;
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goto error_locked;
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}
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if (old_dentry->d_parent != new_dentry->d_parent) {
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/*
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@ -992,14 +981,14 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
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p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
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retval = -EXDEV;
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goto clunk_newdir;
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goto error_locked;
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}
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v9fs_blank_wstat(&wstat);
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wstat.muid = v9ses->uname;
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wstat.name = new_dentry->d_name.name;
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retval = p9_client_wstat(oldfid, &wstat);
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clunk_newdir:
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error_locked:
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if (!retval) {
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if (new_inode) {
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if (S_ISDIR(new_inode->i_mode))
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@ -1020,12 +1009,10 @@ clunk_newdir:
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d_move(old_dentry, new_dentry);
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}
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up_write(&v9ses->rename_sem);
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error:
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p9_fid_put(newdirfid);
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clunk_olddir:
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p9_fid_put(olddirfid);
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done:
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p9_fid_put(oldfid);
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return retval;
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}
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@ -238,7 +238,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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struct inode *inode;
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struct p9_fid *fid = NULL;
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struct v9fs_inode *v9inode;
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struct p9_fid *dfid, *ofid, *inode_fid;
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struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL;
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struct v9fs_session_info *v9ses;
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struct posix_acl *pacl = NULL, *dacl = NULL;
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struct dentry *res = NULL;
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@ -274,7 +274,6 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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if (IS_ERR(ofid)) {
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err = PTR_ERR(ofid);
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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p9_fid_put(dfid);
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goto out;
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}
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@ -286,38 +285,34 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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if (err) {
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p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
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err);
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p9_fid_put(dfid);
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goto error;
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goto out;
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}
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err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
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mode, gid, &qid);
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if (err < 0) {
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p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
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err);
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p9_fid_put(dfid);
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goto error;
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goto out;
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}
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v9fs_invalidate_inode_attr(dir);
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/* instantiate inode and assign the unopened fid to the dentry */
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fid = p9_client_walk(dfid, 1, &name, 1);
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p9_fid_put(dfid);
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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fid = NULL;
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goto error;
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goto out;
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}
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
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goto error;
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goto out;
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}
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/* Now set the ACL based on the default value */
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v9fs_set_create_acl(inode, fid, dacl, pacl);
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v9fs_fid_add(dentry, fid);
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v9fs_fid_add(dentry, &fid);
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d_instantiate(dentry, inode);
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v9inode = V9FS_I(inode);
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@ -336,7 +331,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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if (IS_ERR(inode_fid)) {
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err = PTR_ERR(inode_fid);
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mutex_unlock(&v9inode->v_mutex);
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goto err_clunk_old_fid;
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goto out;
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}
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v9inode->writeback_fid = (void *) inode_fid;
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}
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@ -344,25 +339,20 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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/* Since we are opening a file, assign the open fid to the file */
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err = finish_open(file, dentry, generic_file_open);
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if (err)
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goto err_clunk_old_fid;
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goto out;
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file->private_data = ofid;
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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fscache_use_cookie(v9fs_inode_cookie(v9inode),
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file->f_mode & FMODE_WRITE);
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v9fs_open_fid_add(inode, ofid);
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v9fs_open_fid_add(inode, &ofid);
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file->f_mode |= FMODE_CREATED;
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out:
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p9_fid_put(dfid);
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p9_fid_put(ofid);
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p9_fid_put(fid);
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v9fs_put_acl(dacl, pacl);
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dput(res);
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return err;
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|
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error:
|
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if (fid)
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p9_fid_put(fid);
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err_clunk_old_fid:
|
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if (ofid)
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p9_fid_put(ofid);
|
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goto out;
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}
|
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|
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/**
|
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@ -400,7 +390,6 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
|
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if (IS_ERR(dfid)) {
|
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err = PTR_ERR(dfid);
|
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p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
|
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dfid = NULL;
|
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goto error;
|
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}
|
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|
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@ -422,7 +411,6 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
|
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err = PTR_ERR(fid);
|
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
|
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err);
|
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fid = NULL;
|
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goto error;
|
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}
|
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|
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@ -435,10 +423,9 @@ static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
|
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err);
|
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goto error;
|
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}
|
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v9fs_fid_add(dentry, fid);
|
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v9fs_fid_add(dentry, &fid);
|
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v9fs_set_create_acl(inode, fid, dacl, pacl);
|
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d_instantiate(dentry, inode);
|
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fid = NULL;
|
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err = 0;
|
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} else {
|
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/*
|
||||
@ -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);
|
||||
|
||||
|
||||
@ -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);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user