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Date: Tue, 14 Jul 2020 16:09:09 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-fscrypt@...r.kernel.org, Jiaheng Hu <jiahengh@...gle.com>
Subject: [PATCH] ext4: use generic names for generic ioctls
From: Eric Biggers <ebiggers@...gle.com>
Don't define EXT4_IOC_* aliases to ioctls that already have a generic
FS_IOC_* name. These aliases are unnecessary, and they make it unclear
which ioctls are ext4-specific and which are generic.
Exception: leave EXT4_IOC_GETVERSION_OLD and EXT4_IOC_SETVERSION_OLD
as-is for now, since renaming them to FS_IOC_GETVERSION and
FS_IOC_SETVERSION would probably make them more likely to be confused
with EXT4_IOC_GETVERSION and EXT4_IOC_SETVERSION which also exist.
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
Documentation/admin-guide/ext4.rst | 20 +++++++++----------
fs/ext4/ext4.h | 12 +----------
fs/ext4/ioctl.c | 32 +++++++++++++++---------------
3 files changed, 27 insertions(+), 37 deletions(-)
diff --git a/Documentation/admin-guide/ext4.rst b/Documentation/admin-guide/ext4.rst
index 9443fcef1876..7fc6a72920c9 100644
--- a/Documentation/admin-guide/ext4.rst
+++ b/Documentation/admin-guide/ext4.rst
@@ -522,21 +522,21 @@ Files in /sys/fs/ext4/<devname>:
Ioctls
======
-There is some Ext4 specific functionality which can be accessed by applications
-through the system call interfaces. The list of all Ext4 specific ioctls are
-shown in the table below.
+Ext4 implements various ioctls which can be used by applications to access
+ext4-specific functionality. An incomplete list of these ioctls is shown in the
+table below. This list includes truly ext4-specific ioctls (``EXT4_IOC_*``) as
+well as ioctls that may have been ext4-specific originally but are now supported
+by some other filesystem(s) too (``FS_IOC_*``).
-Table of Ext4 specific ioctls
+Table of Ext4 ioctls
- EXT4_IOC_GETFLAGS
+ FS_IOC_GETFLAGS
Get additional attributes associated with inode. The ioctl argument is
- an integer bitfield, with bit values described in ext4.h. This ioctl is
- an alias for FS_IOC_GETFLAGS.
+ an integer bitfield, with bit values described in ext4.h.
- EXT4_IOC_SETFLAGS
+ FS_IOC_SETFLAGS
Set additional attributes associated with inode. The ioctl argument is
- an integer bitfield, with bit values described in ext4.h. This ioctl is
- an alias for FS_IOC_SETFLAGS.
+ an integer bitfield, with bit values described in ext4.h.
EXT4_IOC_GETVERSION, EXT4_IOC_GETVERSION_OLD
Get the inode i_generation number stored for each inode. The
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 42f5060f3cdf..fe71533afe71 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -437,7 +437,7 @@ struct flex_groups {
#define EXT4_FL_USER_VISIBLE 0x725BDFFF /* User visible flags */
#define EXT4_FL_USER_MODIFIABLE 0x624BC0FF /* User modifiable flags */
-/* Flags we can manipulate with through EXT4_IOC_FSSETXATTR */
+/* Flags we can manipulate with through FS_IOC_FSSETXATTR */
#define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
EXT4_IMMUTABLE_FL | \
EXT4_APPEND_FL | \
@@ -669,8 +669,6 @@ enum {
/*
* ioctl commands
*/
-#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
-#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
@@ -687,17 +685,11 @@ enum {
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
-#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
-#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
-#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
/* ioctl codes 19--39 are reserved for fscrypt */
#define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
#define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
-#define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
-#define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
-
#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
/*
@@ -722,8 +714,6 @@ enum {
/*
* ioctl commands in 32 bit emulation
*/
-#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
-#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 999cf6add39c..6e70a63dcca7 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -819,12 +819,12 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
switch (cmd) {
case FS_IOC_GETFSMAP:
return ext4_ioc_getfsmap(sb, (void __user *)arg);
- case EXT4_IOC_GETFLAGS:
+ case FS_IOC_GETFLAGS:
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
if (S_ISREG(inode->i_mode))
flags &= ~EXT4_PROJINHERIT_FL;
return put_user(flags, (int __user *) arg);
- case EXT4_IOC_SETFLAGS: {
+ case FS_IOC_SETFLAGS: {
int err;
if (!inode_owner_or_capable(inode))
@@ -1129,12 +1129,12 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT4_IOC_PRECACHE_EXTENTS:
return ext4_ext_precache(inode);
- case EXT4_IOC_SET_ENCRYPTION_POLICY:
+ case FS_IOC_SET_ENCRYPTION_POLICY:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
- case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
+ case FS_IOC_GET_ENCRYPTION_PWSALT: {
#ifdef CONFIG_FS_ENCRYPTION
int err, err2;
struct ext4_sb_info *sbi = EXT4_SB(sb);
@@ -1174,7 +1174,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EOPNOTSUPP;
#endif
}
- case EXT4_IOC_GET_ENCRYPTION_POLICY:
+ case FS_IOC_GET_ENCRYPTION_POLICY:
if (!ext4_has_feature_encrypt(sb))
return -EOPNOTSUPP;
return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
@@ -1236,7 +1236,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case EXT4_IOC_GET_ES_CACHE:
return ext4_ioctl_get_es_cache(filp, arg);
- case EXT4_IOC_FSGETXATTR:
+ case FS_IOC_FSGETXATTR:
{
struct fsxattr fa;
@@ -1247,7 +1247,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EFAULT;
return 0;
}
- case EXT4_IOC_FSSETXATTR:
+ case FS_IOC_FSSETXATTR:
{
struct fsxattr fa, old_fa;
int err;
@@ -1313,11 +1313,11 @@ long ext4_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 EXT4_IOC32_GETFLAGS:
- cmd = EXT4_IOC_GETFLAGS;
+ case FS_IOC32_GETFLAGS:
+ cmd = FS_IOC_GETFLAGS;
break;
- case EXT4_IOC32_SETFLAGS:
- cmd = EXT4_IOC_SETFLAGS;
+ case FS_IOC32_SETFLAGS:
+ cmd = FS_IOC_SETFLAGS;
break;
case EXT4_IOC32_GETVERSION:
cmd = EXT4_IOC_GETVERSION;
@@ -1361,9 +1361,9 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_RESIZE_FS:
case FITRIM:
case EXT4_IOC_PRECACHE_EXTENTS:
- case EXT4_IOC_SET_ENCRYPTION_POLICY:
- case EXT4_IOC_GET_ENCRYPTION_PWSALT:
- case EXT4_IOC_GET_ENCRYPTION_POLICY:
+ case FS_IOC_SET_ENCRYPTION_POLICY:
+ case FS_IOC_GET_ENCRYPTION_PWSALT:
+ case FS_IOC_GET_ENCRYPTION_POLICY:
case FS_IOC_GET_ENCRYPTION_POLICY_EX:
case FS_IOC_ADD_ENCRYPTION_KEY:
case FS_IOC_REMOVE_ENCRYPTION_KEY:
@@ -1377,8 +1377,8 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case EXT4_IOC_CLEAR_ES_CACHE:
case EXT4_IOC_GETSTATE:
case EXT4_IOC_GET_ES_CACHE:
- case EXT4_IOC_FSGETXATTR:
- case EXT4_IOC_FSSETXATTR:
+ case FS_IOC_FSGETXATTR:
+ case FS_IOC_FSSETXATTR:
break;
default:
return -ENOIOCTLCMD;
--
2.27.0
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