72 lines
2 KiB
Diff
72 lines
2 KiB
Diff
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From fcbd68fd6556b2f05c47a0399c2e6fd7689bfdab Mon Sep 17 00:00:00 2001
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From: Adrian Chelaru <che.adrian@yahoo.com>
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Date: Wed, 8 Feb 2023 16:14:24 +0000
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Subject: [PATCH 1/5] cache the value of file_inode() in struct file
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---
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fs/file_table.c | 2 ++
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fs/open.c | 2 ++
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include/linux/fs.h | 6 ++++++
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3 files changed, 10 insertions(+)
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diff --git a/fs/file_table.c b/fs/file_table.c
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index 70f2a0fd..768cf946 100644
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--- a/fs/file_table.c
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+++ b/fs/file_table.c
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@@ -176,6 +176,7 @@ struct file *alloc_file(struct path *path, fmode_t mode,
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return NULL;
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file->f_path = *path;
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+ file->f_inode = path->dentry->d_inode;
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file->f_mapping = path->dentry->d_inode->i_mapping;
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file->f_mode = mode;
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file->f_op = fop;
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@@ -259,6 +260,7 @@ static void __fput(struct file *file)
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drop_file_write_access(file);
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file->f_path.dentry = NULL;
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file->f_path.mnt = NULL;
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+ file->f_inode = NULL;
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file_free(file);
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dput(dentry);
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mntput(mnt);
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diff --git a/fs/open.c b/fs/open.c
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index 3f1108b1..2c60e49b 100644
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--- a/fs/open.c
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+++ b/fs/open.c
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@@ -660,6 +660,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
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f->f_mode = FMODE_PATH;
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inode = dentry->d_inode;
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+ f->f_inode = dentry->d_inode;
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if (f->f_mode & FMODE_WRITE) {
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error = __get_file_write_access(inode, mnt);
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if (error)
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@@ -733,6 +734,7 @@ cleanup_all:
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file_sb_list_del(f);
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f->f_path.dentry = NULL;
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f->f_path.mnt = NULL;
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+ f->f_inode = NULL;
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cleanup_file:
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put_filp(f);
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dput(dentry);
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diff --git a/include/linux/fs.h b/include/linux/fs.h
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index b827a8fd..a609ade3 100644
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--- a/include/linux/fs.h
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+++ b/include/linux/fs.h
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@@ -2221,6 +2221,12 @@ static inline bool execute_ok(struct inode *inode)
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return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode);
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}
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+static inline struct inode *file_inode(struct file *f)
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+{
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+ /* return f->f_path.dentry->d_inode; / can also use this */
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+ return f->f_inode;
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+}
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+
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/*
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* get_write_access() gets write permission for a file.
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* put_write_access() releases this write permission.
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--
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2.38.3
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