[PATCH v3 08/18] gfs2: convert to fileattr

From: Miklos Szeredi
Date: Thu Mar 25 2021 - 15:39:15 EST

Use the fileattr API to let the VFS handle locking, permission checking and
conversion.

Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
fs/gfs2/file.c | 57 ++++++++++++-------------------------------------
fs/gfs2/inode.c | 4 ++++
fs/gfs2/inode.h | 3 +++
3 files changed, 21 insertions(+), 43 deletions(-)

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 2d500f90cdac..64e8394a5e88 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -25,6 +25,7 @@
#include <linux/dlm_plock.h>
#include <linux/delay.h>
#include <linux/backing-dev.h>
+#include <linux/fileattr.h>

#include "gfs2.h"
#include "incore.h"
@@ -153,9 +154,9 @@ static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags)
return fsflags;
}

-static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
+int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
{
- struct inode *inode = file_inode(filp);
+ struct inode *inode = d_inode(dentry);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_holder gh;
int error;
@@ -168,8 +169,7 @@ static int gfs2_get_flags(struct file *filp, u32 __user *ptr)

fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);

- if (put_user(fsflags, ptr))
- error = -EFAULT;
+ fileattr_fill_flags(fa, fsflags);

gfs2_glock_dq(&gh);
out_uninit:
@@ -213,33 +213,19 @@ void gfs2_set_inode_flags(struct inode *inode)
* @fsflags: The FS_* inode flags passed in
*
*/
-static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
+static int do_gfs2_set_flags(struct inode *inode, u32 reqflags, u32 mask,
const u32 fsflags)
{
- struct inode *inode = file_inode(filp);
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct buffer_head *bh;
struct gfs2_holder gh;
int error;
- u32 new_flags, flags, oldflags;
-
- error = mnt_want_write_file(filp);
- if (error)
- return error;
+ u32 new_flags, flags;

error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
if (error)
- goto out_drop_write;
-
- oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags);
- error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags);
- if (error)
- goto out;
-
- error = -EACCES;
- if (!inode_owner_or_capable(&init_user_ns, inode))
- goto out;
+ return error;

error = 0;
flags = ip->i_diskflags;
@@ -252,9 +238,6 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
goto out;
if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
goto out;
- if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
- !capable(CAP_LINUX_IMMUTABLE))
- goto out;
if (!IS_IMMUTABLE(inode)) {
error = gfs2_permission(&init_user_ns, inode, MAY_WRITE);
if (error)
@@ -291,20 +274,19 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask,
gfs2_trans_end(sdp);
out:
gfs2_glock_dq_uninit(&gh);
-out_drop_write:
- mnt_drop_write_file(filp);
return error;
}

-static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
+int gfs2_fileattr_set(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct fileattr *fa)
{
- struct inode *inode = file_inode(filp);
- u32 fsflags, gfsflags = 0;
+ struct inode *inode = d_inode(dentry);
+ u32 fsflags = fa->flags, gfsflags = 0;
u32 mask;
int i;

- if (get_user(fsflags, ptr))
- return -EFAULT;
+ if (fileattr_has_fsx(fa))
+ return -EOPNOTSUPP;

for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
if (fsflags & fsflag_gfs2flag[i].fsflag) {
@@ -325,7 +307,7 @@ static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
}

- return do_gfs2_set_flags(filp, gfsflags, mask, fsflags);
+ return do_gfs2_set_flags(inode, gfsflags, mask, fsflags);
}

static int gfs2_getlabel(struct file *filp, char __user *label)
@@ -342,10 +324,6 @@ static int gfs2_getlabel(struct file *filp, char __user *label)
static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch(cmd) {
- case FS_IOC_GETFLAGS:
- return gfs2_get_flags(filp, (u32 __user *)arg);
- case FS_IOC_SETFLAGS:
- return gfs2_set_flags(filp, (u32 __user *)arg);
case FITRIM:
return gfs2_fitrim(filp, (void __user *)arg);
case FS_IOC_GETFSLABEL:
@@ -359,13 +337,6 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
static long gfs2_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch(cmd) {
- /* These are just misnamed, they actually get/put from/to user an int */
- case FS_IOC32_GETFLAGS:
- cmd = FS_IOC_GETFLAGS;
- break;
- case FS_IOC32_SETFLAGS:
- cmd = FS_IOC_SETFLAGS;
- break;
/* Keep this list in sync with gfs2_ioctl */
case FITRIM:
case FS_IOC_GETFSLABEL:
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index c9775d5c6594..6a63607ac526 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -2157,6 +2157,8 @@ static const struct inode_operations gfs2_file_iops = {
.get_acl = gfs2_get_acl,
.set_acl = gfs2_set_acl,
.update_time = gfs2_update_time,
+ .fileattr_get = gfs2_fileattr_get,
+ .fileattr_set = gfs2_fileattr_set,
};

static const struct inode_operations gfs2_dir_iops = {
@@ -2178,6 +2180,8 @@ static const struct inode_operations gfs2_dir_iops = {
.set_acl = gfs2_set_acl,
.update_time = gfs2_update_time,
.atomic_open = gfs2_atomic_open,
+ .fileattr_get = gfs2_fileattr_get,
+ .fileattr_set = gfs2_fileattr_set,
};

static const struct inode_operations gfs2_symlink_iops = {
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index c447bd5b3017..9e898660eae0 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -111,6 +111,9 @@ extern loff_t gfs2_seek_hole(struct file *file, loff_t offset);
extern const struct file_operations gfs2_file_fops_nolock;
extern const struct file_operations gfs2_dir_fops_nolock;

+extern int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
+extern int gfs2_fileattr_set(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct fileattr *fa);
extern void gfs2_set_inode_flags(struct inode *inode);

#ifdef CONFIG_GFS2_FS_LOCKING_DLM
--
2.30.2