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Date: Wed, 3 Feb 2021 13:40:59 +0100
From: Miklos Szeredi <mszeredi@...hat.com>
To: linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: [PATCH 05/18] ext2: convert to miscattr
Use the miscattr API to let the VFS handle locking, permission checking and
conversion.
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Cc: Jan Kara <jack@...e.cz>
---
fs/ext2/ext2.h | 6 ++--
fs/ext2/file.c | 2 ++
fs/ext2/ioctl.c | 85 ++++++++++++++++---------------------------------
fs/ext2/namei.c | 2 ++
4 files changed, 34 insertions(+), 61 deletions(-)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 2a4175fbaf5e..fe06953770ad 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -283,8 +283,6 @@ static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
/*
* ioctl commands
*/
-#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
-#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
@@ -293,8 +291,6 @@ static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
/*
* ioctl commands in 32 bit emulation
*/
-#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
-#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
@@ -771,6 +767,8 @@ extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len);
/* ioctl.c */
+extern int ext2_miscattr_get(struct dentry *dentry, struct miscattr *ma);
+extern int ext2_miscattr_set(struct dentry *dentry, struct miscattr *ma);
extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index 96044f5dbc0e..096c03612129 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -204,4 +204,6 @@ const struct inode_operations ext2_file_inode_operations = {
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.fiemap = ext2_fiemap,
+ .miscattr_get = ext2_miscattr_get,
+ .miscattr_set = ext2_miscattr_set,
};
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
index 32a8d10b579d..9900d9054a02 100644
--- a/fs/ext2/ioctl.c
+++ b/fs/ext2/ioctl.c
@@ -16,69 +16,46 @@
#include <linux/mount.h>
#include <asm/current.h>
#include <linux/uaccess.h>
+#include <linux/miscattr.h>
-
-long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+int ext2_miscattr_get(struct dentry *dentry, struct miscattr *ma)
{
- struct inode *inode = file_inode(filp);
- struct ext2_inode_info *ei = EXT2_I(inode);
- unsigned int flags;
- unsigned short rsv_window_size;
- int ret;
-
- ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
+ struct ext2_inode_info *ei = EXT2_I(d_inode(dentry));
- switch (cmd) {
- case EXT2_IOC_GETFLAGS:
- flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
- return put_user(flags, (int __user *) arg);
- case EXT2_IOC_SETFLAGS: {
- unsigned int oldflags;
+ ma->flags = ei->i_flags & EXT2_FL_USER_VISIBLE;
+ return 0;
+}
- ret = mnt_want_write_file(filp);
- if (ret)
- return ret;
+int ext2_miscattr_set(struct dentry *dentry, struct miscattr *ma)
+{
+ struct inode *inode = d_inode(dentry);
+ struct ext2_inode_info *ei = EXT2_I(inode);
- if (!inode_owner_or_capable(inode)) {
- ret = -EACCES;
- goto setflags_out;
- }
+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode))
+ return -EPERM;
- if (get_user(flags, (int __user *) arg)) {
- ret = -EFAULT;
- goto setflags_out;
- }
+ ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) |
+ (ma->flags & EXT2_FL_USER_MODIFIABLE);
- flags = ext2_mask_flags(inode->i_mode, flags);
+ ext2_set_inode_flags(inode);
+ inode->i_ctime = current_time(inode);
+ mark_inode_dirty(inode);
- inode_lock(inode);
- /* Is it quota file? Do not allow user to mess with it */
- if (IS_NOQUOTA(inode)) {
- inode_unlock(inode);
- ret = -EPERM;
- goto setflags_out;
- }
- oldflags = ei->i_flags;
+ return 0;
+}
- ret = vfs_ioc_setflags_prepare(inode, oldflags, flags);
- if (ret) {
- inode_unlock(inode);
- goto setflags_out;
- }
- flags = flags & EXT2_FL_USER_MODIFIABLE;
- flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE;
- ei->i_flags = flags;
+long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct ext2_inode_info *ei = EXT2_I(inode);
+ unsigned short rsv_window_size;
+ int ret;
- ext2_set_inode_flags(inode);
- inode->i_ctime = current_time(inode);
- inode_unlock(inode);
+ ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg);
- mark_inode_dirty(inode);
-setflags_out:
- mnt_drop_write_file(filp);
- return ret;
- }
+ switch (cmd) {
case EXT2_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *) arg);
case EXT2_IOC_SETVERSION: {
@@ -163,12 +140,6 @@ long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
/* These are just misnamed, they actually get/put from/to user an int */
switch (cmd) {
- case EXT2_IOC32_GETFLAGS:
- cmd = EXT2_IOC_GETFLAGS;
- break;
- case EXT2_IOC32_SETFLAGS:
- cmd = EXT2_IOC_SETFLAGS;
- break;
case EXT2_IOC32_GETVERSION:
cmd = EXT2_IOC_GETVERSION;
break;
diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index ea980f1e2e99..f1f81d07155d 100644
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -421,6 +421,8 @@ const struct inode_operations ext2_dir_inode_operations = {
.get_acl = ext2_get_acl,
.set_acl = ext2_set_acl,
.tmpfile = ext2_tmpfile,
+ .miscattr_get = ext2_miscattr_get,
+ .miscattr_set = ext2_miscattr_set,
};
const struct inode_operations ext2_special_inode_operations = {
--
2.26.2
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