[v5 5/5] Adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support for ext4

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This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
support for ext4. The interface is kept consistent with
XFS_IOC_FSGETXATTR/XFS_IOC_FSGETXATTR.

Signed-off-by: Li Xi <lixi@xxxxxxx>
---
 fs/ext4/ext4.h          |    2 +
 fs/ext4/ioctl.c         |  151 +++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_fs.h         |   17 +-----
 include/uapi/linux/fs.h |   22 +++++++
 4 files changed, 177 insertions(+), 15 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f0e3e08..ebe40ad 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -619,6 +619,8 @@ enum {
 #define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
 #define EXT4_IOC_GETPROJECT		_IOR('f', 19, long)
 #define EXT4_IOC_SETPROJECT		_IOW('f', 20, long)
+#define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR
+#define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR
 
 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
 /*
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index b685c42..21ec6fb 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -200,6 +200,112 @@ journal_err_out:
 	return err;
 }
 
+static int ext4_ioctl_setflags(struct file *filp, unsigned int flags)
+{
+	struct inode *inode = file_inode(filp);
+	struct ext4_inode_info *ei = EXT4_I(inode);
+	handle_t *handle = NULL;
+	int err, migrate = 0;
+	struct ext4_iloc iloc;
+	unsigned int oldflags, mask, i;
+	unsigned int jflag;
+
+	if (!inode_owner_or_capable(inode))
+		return -EACCES;
+
+	err = mnt_want_write_file(filp);
+	if (err)
+		return err;
+
+	flags = ext4_mask_flags(inode->i_mode, flags);
+
+	err = -EPERM;
+	mutex_lock(&inode->i_mutex);
+	/* Is it quota file? Do not allow user to mess with it */
+	if (IS_NOQUOTA(inode))
+		goto flags_out;
+
+	oldflags = ei->i_flags;
+
+	/* The JOURNAL_DATA flag is modifiable only by root */
+	jflag = flags & EXT4_JOURNAL_DATA_FL;
+
+	/*
+	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+	 * the relevant capability.
+	 *
+	 * This test looks nicer. Thanks to Pauline Middelink
+	 */
+	if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
+		if (!capable(CAP_LINUX_IMMUTABLE))
+			goto flags_out;
+	}
+
+	/*
+	 * The JOURNAL_DATA flag can only be changed by
+	 * the relevant capability.
+	 */
+	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
+		if (!capable(CAP_SYS_RESOURCE))
+			goto flags_out;
+	}
+	if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
+		migrate = 1;
+		if (flags & EXT4_EOFBLOCKS_FL) {
+		/* we don't support adding EOFBLOCKS flag */
+		if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
+			err = -EOPNOTSUPP;
+			goto flags_out;
+		}
+	} else if (oldflags & EXT4_EOFBLOCKS_FL)
+		ext4_truncate(inode);
+
+	handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
+	if (IS_ERR(handle)) {
+		err = PTR_ERR(handle);
+		goto flags_out;
+	}
+	if (IS_SYNC(inode))
+		ext4_handle_sync(handle);
+	err = ext4_reserve_inode_write(handle, inode, &iloc);
+	if (err)
+		goto flags_err;
+
+	for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
+		if (!(mask & EXT4_FL_USER_MODIFIABLE))
+			continue;
+		if (mask & flags)
+			ext4_set_inode_flag(inode, i);
+		else
+			ext4_clear_inode_flag(inode, i);
+	}
+
+	ext4_set_inode_flags(inode);
+	inode->i_ctime = ext4_current_time(inode);
+
+	err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+flags_err:
+	ext4_journal_stop(handle);
+	if (err)
+		goto flags_out;
+
+	if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
+		err = ext4_change_inode_journal_flag(inode, jflag);
+	if (err)
+		goto flags_out;
+	if (migrate) {
+		if (flags & EXT4_EXTENTS_FL)
+			err = ext4_ext_migrate(inode);
+		else
+			err = ext4_ind_migrate(inode);
+	}
+
+flags_out:
+	mutex_unlock(&inode->i_mutex);
+	mnt_drop_write_file(filp);
+	return err;
+}
+
 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 {
 	struct inode *inode = file_inode(filp);
@@ -720,6 +826,51 @@ resizefs_out:
 
 		return ext4_ioctl_setproject(filp, projid);
 	}
+	case EXT4_IOC_FSGETXATTR:
+	{
+		struct fsxattr fa;
+
+		memset(&fa, 0, sizeof(struct fsxattr));
+
+		ext4_get_inode_flags(ei);
+		fa.fsx_xflags = ei->i_flags & EXT4_FL_USER_VISIBLE;
+		fa.fsx_valid |= FSX_XFLAGS;
+
+		if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+				EXT4_FEATURE_RO_COMPAT_PROJECT)) {
+			fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
+				EXT4_I(inode)->i_projid);
+			fa.fsx_valid |= FSX_PROJID;
+		}
+
+		if (copy_to_user((struct fsxattr __user *)arg,
+				 &fa, sizeof(fa)))
+			return -EFAULT;
+		return 0;
+	}
+	case EXT4_IOC_FSSETXATTR:
+	{
+		struct fsxattr fa;
+		int err;
+
+		if (copy_from_user(&fa, (struct fsxattr __user *)arg,
+				   sizeof(fa)))
+			return -EFAULT;
+
+		if (fa.fsx_valid & FSX_XFLAGS) {
+			err = ext4_ioctl_setflags(filp, fa.fsx_xflags);
+			if (err)
+				return err;
+		}
+
+		if (fa.fsx_valid & FSX_PROJID) {
+			err = ext4_ioctl_setproject(filp, fa.fsx_projid);
+			if (err)
+				return err;
+		}
+
+		return 0;
+	}
 	default:
 		return -ENOTTY;
 	}
diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h
index 18dc721..5dd6013 100644
--- a/fs/xfs/xfs_fs.h
+++ b/fs/xfs/xfs_fs.h
@@ -36,19 +36,6 @@ struct dioattr {
 #endif
 
 /*
- * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
- */
-#ifndef HAVE_FSXATTR
-struct fsxattr {
-	__u32		fsx_xflags;	/* xflags field value (get/set) */
-	__u32		fsx_extsize;	/* extsize field value (get/set)*/
-	__u32		fsx_nextents;	/* nextents field value (get)	*/
-	__u32		fsx_projid;	/* project identifier (get/set) */
-	unsigned char	fsx_pad[12];
-};
-#endif
-
-/*
  * Flags for the bs_xflags/fsx_xflags field
  * There should be a one-to-one correspondence between these flags and the
  * XFS_DIFLAG_s.
@@ -503,8 +490,8 @@ typedef struct xfs_swapext
 #define XFS_IOC_ALLOCSP		_IOW ('X', 10, struct xfs_flock64)
 #define XFS_IOC_FREESP		_IOW ('X', 11, struct xfs_flock64)
 #define XFS_IOC_DIOINFO		_IOR ('X', 30, struct dioattr)
-#define XFS_IOC_FSGETXATTR	_IOR ('X', 31, struct fsxattr)
-#define XFS_IOC_FSSETXATTR	_IOW ('X', 32, struct fsxattr)
+#define XFS_IOC_FSGETXATTR	FS_IOC_FSGETXATTR
+#define XFS_IOC_FSSETXATTR	FS_IOC_FSSETXATTR
 #define XFS_IOC_ALLOCSP64	_IOW ('X', 36, struct xfs_flock64)
 #define XFS_IOC_FREESP64	_IOW ('X', 37, struct xfs_flock64)
 #define XFS_IOC_GETBMAP		_IOWR('X', 38, struct getbmap)
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index ca1a11b..89c6492 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -57,6 +57,26 @@ struct inodes_stat_t {
 	long dummy[5];		/* padding for sysctl ABI compatibility */
 };
 
+/*
+ * Extend attribute flags. These should be or-ed together to figure out what
+ * is valid.
+ */
+#define FSX_XFLAGS	(1 << 0)
+#define FSX_EXTSIZE	(1 << 1)
+#define FSX_NEXTENTS	(1 << 2)
+#define FSX_PROJID	(1 << 3)
+
+/*
+ * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
+ */
+struct fsxattr {
+	__u32		fsx_xflags;	/* xflags field value (get/set) */
+	__u32		fsx_extsize;	/* extsize field value (get/set)*/
+	__u32		fsx_nextents;	/* nextents field value (get)	*/
+	__u32		fsx_projid;	/* project identifier (get/set) */
+	__u32		fsx_valid;
+	unsigned char	fsx_pad[8];
+};
 
 #define NR_FILE  8192	/* this can well be larger on a larger system */
 
@@ -162,6 +182,8 @@ struct inodes_stat_t {
 #define	FS_IOC_GETVERSION		_IOR('v', 1, long)
 #define	FS_IOC_SETVERSION		_IOW('v', 2, long)
 #define FS_IOC_FIEMAP			_IOWR('f', 11, struct fiemap)
+#define FS_IOC_FSGETXATTR		_IOR('f', 31, long)
+#define FS_IOC_FSSETXATTR		_IOW('f', 32, long)
 #define FS_IOC32_GETFLAGS		_IOR('f', 1, int)
 #define FS_IOC32_SETFLAGS		_IOW('f', 2, int)
 #define FS_IOC32_GETVERSION		_IOR('v', 1, int)
-- 
1.7.1

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