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
Signed-off-by: Dominique Martinet <[email protected]>
---
fs/9p/fid.c | 24 +++++++++++------
fs/9p/fid.h | 4 +--
fs/9p/vfs_file.c | 5 ++--
fs/9p/vfs_inode.c | 61 +++++++++++++++++-------------------------
fs/9p/vfs_inode_dotl.c | 58 +++++++++++++--------------------------
fs/9p/vfs_super.c | 2 +-
6 files changed, 64 insertions(+), 90 deletions(-)
diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index d792499349c4..289a85eae2ae 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 3168dfad510e..8a4e8cd12ca2 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 8276f3af35d7..aec43ba83799 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 38186d1a1440..1b11a92208fd 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -398,10 +398,8 @@ 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)
@@ -632,14 +630,12 @@ 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;
}
@@ -650,8 +646,6 @@ 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;
}
/*
@@ -662,21 +656,17 @@ 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);
}
@@ -803,9 +793,9 @@ 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);
}
@@ -846,7 +836,6 @@ 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;
}
@@ -881,7 +870,7 @@ 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:
@@ -889,8 +878,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
return err;
error:
- if (fid)
- p9_fid_put(fid);
+ p9_fid_put(fid);
goto out;
}
@@ -938,9 +926,9 @@ 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)
@@ -957,21 +945,22 @@ 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);
@@ -982,7 +971,7 @@ 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) {
/*
@@ -991,14 +980,14 @@ 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))
@@ -1019,12 +1008,10 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
d_move(old_dentry, new_dentry);
}
up_write(&v9ses->rename_sem);
+
+error:
p9_fid_put(newdirfid);
-
-clunk_olddir:
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 09b124fe349c..5cfa4b4f070f 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 bf350fad9500..2d9ee073d12c 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);
--
2.35.1
On 2022-06-12 17:53:29, Dominique Martinet wrote:
> 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
Another really nice cleanup. Only one small comment below.
>
> Signed-off-by: Dominique Martinet <[email protected]>
> ---
> fs/9p/fid.c | 24 +++++++++++------
> fs/9p/fid.h | 4 +--
> fs/9p/vfs_file.c | 5 ++--
> fs/9p/vfs_inode.c | 61 +++++++++++++++++-------------------------
> fs/9p/vfs_inode_dotl.c | 58 +++++++++++++--------------------------
> fs/9p/vfs_super.c | 2 +-
> 6 files changed, 64 insertions(+), 90 deletions(-)
>
> diff --git a/fs/9p/fid.c b/fs/9p/fid.c
> index d792499349c4..289a85eae2ae 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,
To keep the readability benefits in my "9p: Track the root fid with its
own variable during lookups" patch, I think root_fid should be assigned
here and then used in the error check and return statement.
> + 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);
root_fid should be used in the two lines above, too.
With these changes,
Reviewed-by: Tyler Hicks <[email protected]>
Tyler
> }
> /* 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 3168dfad510e..8a4e8cd12ca2 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 8276f3af35d7..aec43ba83799 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 38186d1a1440..1b11a92208fd 100644
> --- a/fs/9p/vfs_inode.c
> +++ b/fs/9p/vfs_inode.c
> @@ -398,10 +398,8 @@ 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)
> @@ -632,14 +630,12 @@ 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;
> }
>
> @@ -650,8 +646,6 @@ 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;
> }
> /*
> @@ -662,21 +656,17 @@ 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);
> }
>
> @@ -803,9 +793,9 @@ 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);
> }
> @@ -846,7 +836,6 @@ 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;
> }
>
> @@ -881,7 +870,7 @@ 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:
> @@ -889,8 +878,7 @@ v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
> return err;
>
> error:
> - if (fid)
> - p9_fid_put(fid);
> + p9_fid_put(fid);
> goto out;
> }
>
> @@ -938,9 +926,9 @@ 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)
> @@ -957,21 +945,22 @@ 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);
> @@ -982,7 +971,7 @@ 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) {
> /*
> @@ -991,14 +980,14 @@ 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))
> @@ -1019,12 +1008,10 @@ v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
> d_move(old_dentry, new_dentry);
> }
> up_write(&v9ses->rename_sem);
> +
> +error:
> p9_fid_put(newdirfid);
> -
> -clunk_olddir:
> 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 09b124fe349c..5cfa4b4f070f 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 bf350fad9500..2d9ee073d12c 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);
> --
> 2.35.1
>
Thanks for the reviews,
Tyler Hicks wrote on Mon, Jun 13, 2022 at 12:55:09PM -0500:
> > @@ -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,
>
> To keep the readability benefits in my "9p: Track the root fid with its
> own variable during lookups" patch, I think root_fid should be assigned
> here and then used in the error check and return statement.
>
> > + 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);
>
> root_fid should be used in the two lines above, too.
This actually was the only place where we still want to use the root_fid
after calling v9fs_fid_add; if we keep root_fid above we need to do
something like
fid = p9_fid_get(root_fid);
v9fs_Fid_add(dentry->d_sb->s_root, &root_fid);
root_fid = fid;
// fid = NULL; ? not strictly needed as we set it again shortly afterwards
which I wanted to avoid, but I guess I don't mind strongly either way --
pick your poison.
I could also just keep v9fs_fid_add as a non-stealing version, but I
think it's better that way as it strongly signal that we stashed that
ref away and shouldn't use the fid anymore unless another ref was
obtained through fid_get like we do here.
(I was actually tempted to do the same with p9_fid_put, but checking
other kernel "put"s I didn't see any code that does this so I refrained
from that churn)
--
Dominique
On 2022-06-14 04:50:45, Dominique Martinet wrote:
> Thanks for the reviews,
>
> Tyler Hicks wrote on Mon, Jun 13, 2022 at 12:55:09PM -0500:
> > > @@ -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,
> >
> > To keep the readability benefits in my "9p: Track the root fid with its
> > own variable during lookups" patch, I think root_fid should be assigned
> > here and then used in the error check and return statement.
> >
> > > + 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);
> >
> > root_fid should be used in the two lines above, too.
>
> This actually was the only place where we still want to use the root_fid
> after calling v9fs_fid_add; if we keep root_fid above we need to do
> something like
>
> fid = p9_fid_get(root_fid);
> v9fs_Fid_add(dentry->d_sb->s_root, &root_fid);
> root_fid = fid;
> // fid = NULL; ? not strictly needed as we set it again shortly afterwards
>
> which I wanted to avoid, but I guess I don't mind strongly either way --
> pick your poison.
Ah, very good point. I missed that subtly.
> I could also just keep v9fs_fid_add as a non-stealing version, but I
> think it's better that way as it strongly signal that we stashed that
> ref away and shouldn't use the fid anymore unless another ref was
> obtained through fid_get like we do here.
> (I was actually tempted to do the same with p9_fid_put, but checking
> other kernel "put"s I didn't see any code that does this so I refrained
> from that churn)
I like the stealing version. Lets go with it and keep this patch as-is.
Please feel free to slap this tag on it:
Reviewed-by: Tyler Hicks <[email protected]>
Tyler
>
> --
> Dominique
>