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authorMuchun Song <songmuchun@bytedance.com>2022-01-22 09:14:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-22 09:33:37 +0300
commit6dfbbae14a7b961f41d80a106e1ab60e86d061c5 (patch)
tree487d7ecefb4ad5b67b697fd7f99567a795c23455
parenta37265995c867a4e413761d846cef0445b08d6d5 (diff)
downloadlinux-6dfbbae14a7b961f41d80a106e1ab60e86d061c5.tar.xz
fs: proc: store PDE()->data into inode->i_private
PDE_DATA(inode) is introduced to get user private data and hide the layout of struct proc_dir_entry. The inode->i_private is used to do the same thing as well. Save a copy of user private data to inode-> i_private when proc inode is allocated. This means the user also can get their private data by inode->i_private. Introduce pde_data() to wrap inode->i_private so that we can remove PDE_DATA() from fs/proc/generic.c and make PTE_DATE() as a wrapper of pde_data(). It will be easier if we decide to remove PDE_DATE() in the future. Link: https://lkml.kernel.org/r/20211124081956.87711-1-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alexey Gladkov <gladkov.alexey@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/proc/generic.c6
-rw-r--r--fs/proc/inode.c1
-rw-r--r--fs/proc/internal.h5
-rw-r--r--include/linux/proc_fs.h13
4 files changed, 13 insertions, 12 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 5b78739e60e4..f2132407e133 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -791,12 +791,6 @@ void proc_remove(struct proc_dir_entry *de)
}
EXPORT_SYMBOL(proc_remove);
-void *PDE_DATA(const struct inode *inode)
-{
- return __PDE_DATA(inode);
-}
-EXPORT_SYMBOL(PDE_DATA);
-
/*
* Pull a user buffer into memory and pass it to the file's write handler if
* one is supplied. The ->write() method is permitted to modify the
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 599eb724ff2d..f84355c5a36d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -650,6 +650,7 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
return NULL;
}
+ inode->i_private = de->data;
inode->i_ino = de->low_ino;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
PROC_I(inode)->pde = de;
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 03415f3fb3a8..06a80f78433d 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -115,11 +115,6 @@ static inline struct proc_dir_entry *PDE(const struct inode *inode)
return PROC_I(inode)->pde;
}
-static inline void *__PDE_DATA(const struct inode *inode)
-{
- return PDE(inode)->data;
-}
-
static inline struct pid *proc_pid(const struct inode *inode)
{
return PROC_I(inode)->pid;
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 01b9268451a8..b6e7005cc1b2 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -110,7 +110,18 @@ extern struct proc_dir_entry *proc_create_data(const char *, umode_t,
struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
extern void proc_set_size(struct proc_dir_entry *, loff_t);
extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
-extern void *PDE_DATA(const struct inode *);
+
+/*
+ * Obtain the private data passed by user through proc_create_data() or
+ * related.
+ */
+static inline void *pde_data(const struct inode *inode)
+{
+ return inode->i_private;
+}
+
+#define PDE_DATA(i) pde_data(i)
+
extern void *proc_get_parent_data(const struct inode *);
extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *, struct proc_dir_entry *);