From: Jeff Layton <jlayton@kernel.org>
To: Miklos Szeredi <miklos@szeredi.hu>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Chuck Lever <chuck.lever@oracle.com>,
Alexander Aring <alex.aring@gmail.com>,
Trond Myklebust <trondmy@kernel.org>,
Anna Schumaker <anna@kernel.org>,
Steve French <sfrench@samba.org>,
Paulo Alcantara <pc@manguebit.org>,
Ronnie Sahlberg <ronniesahlberg@gmail.com>,
Shyam Prasad N <sprasad@microsoft.com>,
Tom Talpey <tom@talpey.com>,
Bharath SM <bharathsm@microsoft.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Danilo Krummrich <dakr@kernel.org>,
David Howells <dhowells@redhat.com>,
Tyler Hicks <code@tyhicks.com>, NeilBrown <neil@brown.name>,
Olga Kornievskaia <okorniev@redhat.com>,
Dai Ngo <Dai.Ngo@oracle.com>,
Amir Goldstein <amir73il@gmail.com>,
Namjae Jeon <linkinjeon@kernel.org>,
Steve French <smfrench@gmail.com>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Carlos Maiolino <cem@kernel.org>,
Kuniyuki Iwashima <kuniyu@google.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
samba-technical@lists.samba.org, netfs@lists.linux.dev,
ecryptfs@vger.kernel.org, linux-unionfs@vger.kernel.org,
linux-xfs@vger.kernel.org, netdev@vger.kernel.org,
Jeff Layton <jlayton@kernel.org>
Subject: [PATCH v4 03/17] filelock: add struct delegated_inode
Date: Mon, 03 Nov 2025 07:52:31 -0500 [thread overview]
Message-ID: <20251103-dir-deleg-ro-v4-3-961b67adee89@kernel.org> (raw)
In-Reply-To: <20251103-dir-deleg-ro-v4-0-961b67adee89@kernel.org>
The current API requires a pointer to an inode pointer. It's easy for
callers to get this wrong. Add a new delegated_inode structure and use
that to pass back any inode that needs to be waited on.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
fs/attr.c | 2 +-
fs/namei.c | 18 +++++++++---------
fs/open.c | 8 ++++----
fs/posix_acl.c | 8 ++++----
fs/utimes.c | 4 ++--
fs/xattr.c | 12 ++++++------
include/linux/filelock.h | 36 +++++++++++++++++++++++++++---------
include/linux/fs.h | 9 +++++----
include/linux/xattr.h | 4 ++--
9 files changed, 60 insertions(+), 41 deletions(-)
diff --git a/fs/attr.c b/fs/attr.c
index 795f231d00e8eaaadf5b62f241655cb4b69cb507..b9ec6b47bab2fc2b561677b639633bd32994022f 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -415,7 +415,7 @@ EXPORT_SYMBOL(may_setattr);
* performed on the raw inode simply pass @nop_mnt_idmap.
*/
int notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
- struct iattr *attr, struct inode **delegated_inode)
+ struct iattr *attr, struct delegated_inode *delegated_inode)
{
struct inode *inode = dentry->d_inode;
umode_t mode = inode->i_mode;
diff --git a/fs/namei.c b/fs/namei.c
index 7377020a2cba02501483020e0fc93c279fb38d3e..bf42f146f847a5330fc581595c7256af28d9db90 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4648,7 +4648,7 @@ SYSCALL_DEFINE1(rmdir, const char __user *, pathname)
* raw inode simply pass @nop_mnt_idmap.
*/
int vfs_unlink(struct mnt_idmap *idmap, struct inode *dir,
- struct dentry *dentry, struct inode **delegated_inode)
+ struct dentry *dentry, struct delegated_inode *delegated_inode)
{
struct inode *target = dentry->d_inode;
int error = may_delete(idmap, dir, dentry, 0);
@@ -4706,7 +4706,7 @@ int do_unlinkat(int dfd, struct filename *name)
struct qstr last;
int type;
struct inode *inode = NULL;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
unsigned int lookup_flags = 0;
retry:
error = filename_parentat(dfd, name, lookup_flags, &path, &last, &type);
@@ -4743,7 +4743,7 @@ int do_unlinkat(int dfd, struct filename *name)
if (inode)
iput(inode); /* truncate the inode here */
inode = NULL;
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
@@ -4892,7 +4892,7 @@ SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newn
*/
int vfs_link(struct dentry *old_dentry, struct mnt_idmap *idmap,
struct inode *dir, struct dentry *new_dentry,
- struct inode **delegated_inode)
+ struct delegated_inode *delegated_inode)
{
struct inode *inode = old_dentry->d_inode;
unsigned max_links = dir->i_sb->s_max_links;
@@ -4968,7 +4968,7 @@ int do_linkat(int olddfd, struct filename *old, int newdfd,
struct mnt_idmap *idmap;
struct dentry *new_dentry;
struct path old_path, new_path;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
int how = 0;
int error;
@@ -5012,7 +5012,7 @@ int do_linkat(int olddfd, struct filename *old, int newdfd,
new_dentry, &delegated_inode);
out_dput:
end_creating_path(&new_path, new_dentry);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error) {
path_put(&old_path);
@@ -5098,7 +5098,7 @@ int vfs_rename(struct renamedata *rd)
struct inode *new_dir = d_inode(rd->new_parent);
struct dentry *old_dentry = rd->old_dentry;
struct dentry *new_dentry = rd->new_dentry;
- struct inode **delegated_inode = rd->delegated_inode;
+ struct delegated_inode *delegated_inode = rd->delegated_inode;
unsigned int flags = rd->flags;
bool is_dir = d_is_dir(old_dentry);
struct inode *source = old_dentry->d_inode;
@@ -5261,7 +5261,7 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd,
struct path old_path, new_path;
struct qstr old_last, new_last;
int old_type, new_type;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
unsigned int lookup_flags = 0, target_flags =
LOOKUP_RENAME_TARGET | LOOKUP_CREATE;
bool should_retry = false;
@@ -5369,7 +5369,7 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd,
exit3:
unlock_rename(new_path.dentry, old_path.dentry);
exit_lock_rename:
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
diff --git a/fs/open.c b/fs/open.c
index 3d64372ecc675e4795eb0a0deda10f8f67b95640..fdaa6f08f6f4cac5c2fefd3eafa5e430e51f3979 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -631,7 +631,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
int chmod_common(const struct path *path, umode_t mode)
{
struct inode *inode = path->dentry->d_inode;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
struct iattr newattrs;
int error;
@@ -651,7 +651,7 @@ int chmod_common(const struct path *path, umode_t mode)
&newattrs, &delegated_inode);
out_unlock:
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
@@ -756,7 +756,7 @@ int chown_common(const struct path *path, uid_t user, gid_t group)
struct mnt_idmap *idmap;
struct user_namespace *fs_userns;
struct inode *inode = path->dentry->d_inode;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
int error;
struct iattr newattrs;
kuid_t uid;
@@ -791,7 +791,7 @@ int chown_common(const struct path *path, uid_t user, gid_t group)
error = notify_change(idmap, path->dentry, &newattrs,
&delegated_inode);
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 4050942ab52f95741da2df13d191ade5c5ca12a2..768f027c142811ea907fe8545155ba7abd016305 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -1091,7 +1091,7 @@ int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
int acl_type;
int error;
struct inode *inode = d_inode(dentry);
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
acl_type = posix_acl_type(acl_name);
if (acl_type < 0)
@@ -1141,7 +1141,7 @@ int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
out_inode_unlock:
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
@@ -1212,7 +1212,7 @@ int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
int acl_type;
int error;
struct inode *inode = d_inode(dentry);
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
acl_type = posix_acl_type(acl_name);
if (acl_type < 0)
@@ -1249,7 +1249,7 @@ int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
out_inode_unlock:
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
diff --git a/fs/utimes.c b/fs/utimes.c
index c7c7958e57b22f91646ca9f76d18781b64d371a3..bf9f45bdef54947de7ac55c9f873ae9d0336dafa 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -22,7 +22,7 @@ int vfs_utimes(const struct path *path, struct timespec64 *times)
int error;
struct iattr newattrs;
struct inode *inode = path->dentry->d_inode;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
if (times) {
if (!nsec_valid(times[0].tv_nsec) ||
@@ -66,7 +66,7 @@ int vfs_utimes(const struct path *path, struct timespec64 *times)
error = notify_change(mnt_idmap(path->mnt), path->dentry, &newattrs,
&delegated_inode);
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
diff --git a/fs/xattr.c b/fs/xattr.c
index 8851a5ef34f5ab34383975dd4cef537de3f6391e..32d445fb60aaf2aaf4b16b62934dc99bad378067 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -274,7 +274,7 @@ int __vfs_setxattr_noperm(struct mnt_idmap *idmap,
int
__vfs_setxattr_locked(struct mnt_idmap *idmap, struct dentry *dentry,
const char *name, const void *value, size_t size,
- int flags, struct inode **delegated_inode)
+ int flags, struct delegated_inode *delegated_inode)
{
struct inode *inode = dentry->d_inode;
int error;
@@ -305,7 +305,7 @@ vfs_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
const char *name, const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
const void *orig_value = value;
int error;
@@ -322,7 +322,7 @@ vfs_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
flags, &delegated_inode);
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
@@ -533,7 +533,7 @@ EXPORT_SYMBOL(__vfs_removexattr);
int
__vfs_removexattr_locked(struct mnt_idmap *idmap,
struct dentry *dentry, const char *name,
- struct inode **delegated_inode)
+ struct delegated_inode *delegated_inode)
{
struct inode *inode = dentry->d_inode;
int error;
@@ -567,7 +567,7 @@ vfs_removexattr(struct mnt_idmap *idmap, struct dentry *dentry,
const char *name)
{
struct inode *inode = dentry->d_inode;
- struct inode *delegated_inode = NULL;
+ struct delegated_inode delegated_inode = { };
int error;
retry_deleg:
@@ -576,7 +576,7 @@ vfs_removexattr(struct mnt_idmap *idmap, struct dentry *dentry,
name, &delegated_inode);
inode_unlock(inode);
- if (delegated_inode) {
+ if (is_delegated(&delegated_inode)) {
error = break_deleg_wait(&delegated_inode);
if (!error)
goto retry_deleg;
diff --git a/include/linux/filelock.h b/include/linux/filelock.h
index 47da6aa28d8dc9122618d02c6608deda0f3c4d3e..208d108df2d73a9df65e5dc9968d074af385f881 100644
--- a/include/linux/filelock.h
+++ b/include/linux/filelock.h
@@ -486,25 +486,35 @@ static inline int break_deleg(struct inode *inode, unsigned int flags)
return 0;
}
-static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
+struct delegated_inode {
+ struct inode *di_inode;
+};
+
+static inline bool is_delegated(struct delegated_inode *di)
+{
+ return di->di_inode;
+}
+
+static inline int try_break_deleg(struct inode *inode,
+ struct delegated_inode *di)
{
int ret;
ret = break_deleg(inode, LEASE_BREAK_NONBLOCK);
- if (ret == -EWOULDBLOCK && delegated_inode) {
- *delegated_inode = inode;
+ if (ret == -EWOULDBLOCK && di) {
+ di->di_inode = inode;
ihold(inode);
}
return ret;
}
-static inline int break_deleg_wait(struct inode **delegated_inode)
+static inline int break_deleg_wait(struct delegated_inode *di)
{
int ret;
- ret = break_deleg(*delegated_inode, 0);
- iput(*delegated_inode);
- *delegated_inode = NULL;
+ ret = break_deleg(di->di_inode, 0);
+ iput(di->di_inode);
+ di->di_inode = NULL;
return ret;
}
@@ -523,6 +533,13 @@ static inline int break_layout(struct inode *inode, bool wait)
}
#else /* !CONFIG_FILE_LOCKING */
+struct delegated_inode { };
+
+static inline bool is_delegated(struct delegated_inode *di)
+{
+ return false;
+}
+
static inline int break_lease(struct inode *inode, bool wait)
{
return 0;
@@ -533,12 +550,13 @@ static inline int break_deleg(struct inode *inode, unsigned int flags)
return 0;
}
-static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode)
+static inline int try_break_deleg(struct inode *inode,
+ struct delegated_inode *delegated_inode)
{
return 0;
}
-static inline int break_deleg_wait(struct inode **delegated_inode)
+static inline int break_deleg_wait(struct delegated_inode *delegated_inode)
{
BUG();
return 0;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index c895146c1444be36e0a779df55622cc38c9419ff..909a88e3979d4f1ba3104f3d05145e1096ed44d5 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -80,6 +80,7 @@ struct fs_context;
struct fs_parameter_spec;
struct file_kattr;
struct iomap_ops;
+struct delegated_inode;
extern void __init inode_init(void);
extern void __init inode_init_early(void);
@@ -2119,10 +2120,10 @@ int vfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
int vfs_symlink(struct mnt_idmap *, struct inode *,
struct dentry *, const char *);
int vfs_link(struct dentry *, struct mnt_idmap *, struct inode *,
- struct dentry *, struct inode **);
+ struct dentry *, struct delegated_inode *);
int vfs_rmdir(struct mnt_idmap *, struct inode *, struct dentry *);
int vfs_unlink(struct mnt_idmap *, struct inode *, struct dentry *,
- struct inode **);
+ struct delegated_inode *);
/**
* struct renamedata - contains all information required for renaming
@@ -2140,7 +2141,7 @@ struct renamedata {
struct dentry *old_dentry;
struct dentry *new_parent;
struct dentry *new_dentry;
- struct inode **delegated_inode;
+ struct delegated_inode *delegated_inode;
unsigned int flags;
} __randomize_layout;
@@ -3071,7 +3072,7 @@ static inline int bmap(struct inode *inode, sector_t *block)
#endif
int notify_change(struct mnt_idmap *, struct dentry *,
- struct iattr *, struct inode **);
+ struct iattr *, struct delegated_inode *);
int inode_permission(struct mnt_idmap *, struct inode *, int);
int generic_permission(struct mnt_idmap *, struct inode *, int);
static inline int file_permission(struct file *file, int mask)
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 86b0d47984a16d935dd1c45ca80a3b8bb5b7295b..64e9afe7d647dc38f686a4b5c6f765e061cde54c 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -85,12 +85,12 @@ int __vfs_setxattr_noperm(struct mnt_idmap *, struct dentry *,
const char *, const void *, size_t, int);
int __vfs_setxattr_locked(struct mnt_idmap *, struct dentry *,
const char *, const void *, size_t, int,
- struct inode **);
+ struct delegated_inode *);
int vfs_setxattr(struct mnt_idmap *, struct dentry *, const char *,
const void *, size_t, int);
int __vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
int __vfs_removexattr_locked(struct mnt_idmap *, struct dentry *,
- const char *, struct inode **);
+ const char *, struct delegated_inode *);
int vfs_removexattr(struct mnt_idmap *, struct dentry *, const char *);
ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
--
2.51.1
next prev parent reply other threads:[~2025-11-03 12:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-03 12:52 [PATCH v4 00/17] vfs: recall-only directory delegations for knfsd Jeff Layton
2025-11-03 12:52 ` [PATCH v4 01/17] filelock: make lease_alloc() take a flags argument Jeff Layton
2025-11-03 12:52 ` [PATCH v4 02/17] filelock: rework the __break_lease API to use flags Jeff Layton
2025-11-03 12:52 ` Jeff Layton [this message]
2025-11-05 12:19 ` [PATCH v4 03/17] filelock: add struct delegated_inode Christian Brauner
2025-11-03 12:52 ` [PATCH v4 04/17] filelock: push the S_ISREG check down to ->setlease handlers Jeff Layton
2025-11-03 12:52 ` [PATCH v4 05/17] vfs: add try_break_deleg calls for parents to vfs_{link,rename,unlink} Jeff Layton
2025-11-03 12:52 ` [PATCH v4 06/17] vfs: allow mkdir to wait for delegation break on parent Jeff Layton
2025-11-03 12:52 ` [PATCH v4 07/17] vfs: allow rmdir " Jeff Layton
2025-11-03 12:52 ` [PATCH v4 08/17] vfs: break parent dir delegations in open(..., O_CREAT) codepath Jeff Layton
2025-11-03 12:52 ` [PATCH v4 09/17] vfs: add struct createdata for passing arguments to vfs_create() Jeff Layton
2025-11-04 0:06 ` NeilBrown
2025-11-04 0:34 ` NeilBrown
2025-11-03 12:52 ` [PATCH v4 10/17] vfs: make vfs_create break delegations on parent directory Jeff Layton
2025-11-04 0:14 ` NeilBrown
2025-11-04 0:30 ` Jeff Layton
2025-11-05 12:15 ` Christian Brauner
2025-11-04 17:38 ` Simon Horman
2025-11-04 18:10 ` Jeff Layton
2025-11-03 12:52 ` [PATCH v4 11/17] vfs: make vfs_mknod " Jeff Layton
2025-11-03 12:52 ` [PATCH v4 12/17] vfs: make vfs_symlink break delegations on parent dir Jeff Layton
2025-11-03 12:52 ` [PATCH v4 13/17] filelock: lift the ban on directory leases in generic_setlease Jeff Layton
2025-11-03 12:52 ` [PATCH v4 14/17] nfsd: allow filecache to hold S_IFDIR files Jeff Layton
2025-11-03 12:52 ` [PATCH v4 15/17] nfsd: allow DELEGRETURN on directories Jeff Layton
2025-11-03 12:52 ` [PATCH v4 16/17] nfsd: wire up GET_DIR_DELEGATION handling Jeff Layton
2025-11-03 12:52 ` [PATCH v4 17/17] vfs: expose delegation support to userland Jeff Layton
2025-11-03 13:13 ` Jeff Layton
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