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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 2022-06-12 16:05:39 +09:00 committed by Dominique Martinet
parent 286c171b86
commit dafbe68973
6 changed files with 64 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
fs/9p/fid.c
View File

@ -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)

4
fs/9p/fid.h
View File

@ -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);

5
fs/9p/vfs_file.c
View File

@ -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);

61
fs/9p/vfs_inode.c
View File

@ -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);
error:
p9_fid_put(newdirfid);
clunk_olddir:
p9_fid_put(olddirfid);
done:
p9_fid_put(oldfid);
return retval;
}

58
fs/9p/vfs_inode_dotl.c
View File

@ -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);

2
fs/9p/vfs_super.c
View File

@ -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);