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From: Anand Jain <anand.jain@oracle.com>
To: linux-btrfs@vger.kernel.org
Cc: dsterba@suse.cz
Subject: [PATCH 1/2 RFC] btrfs: refactor btrfs_set_props to validate externally
Date: Wed, 17 Apr 2019 23:37:05 +0800	[thread overview]
Message-ID: <20190417153706.29942-2-anand.jain@oracle.com> (raw)
In-Reply-To: <20190417153706.29942-1-anand.jain@oracle.com>

In preparation to merge multiple transactions when setting the
inode attribute flags, move btrfs_set_props()'s validation part
to outside.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/ioctl.c |  3 +++
 fs/btrfs/props.c | 23 +++++++++++++++++------
 fs/btrfs/props.h |  1 +
 fs/btrfs/xattr.c |  5 +++++
 4 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8c9a908d3acc..63e6e2f5b659 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -284,6 +284,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 		binode->flags &= ~BTRFS_INODE_COMPRESS;
 		binode->flags |= BTRFS_INODE_NOCOMPRESS;
 
+		/* set no-compression no need to validate prop here */
 		ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
 					   0, 0);
 		if (ret && ret != -ENODATA)
@@ -299,6 +300,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 		binode->flags |= BTRFS_INODE_COMPRESS;
 		binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
 
+		/* compress_type is already validated during mount options */
 		comp = btrfs_compress_type2str(fs_info->compress_type);
 		if (!comp || comp[0] == 0)
 			comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
@@ -309,6 +311,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
 			goto out_drop;
 
 	} else {
+		/* reset prop, no need of validate prop here */
 		ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
 					   0, 0);
 		if (ret && ret != -ENODATA)
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 44b7bf647ab3..e356dd2a0f73 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -55,6 +55,23 @@ find_prop_handler(const char *name,
 	return NULL;
 }
 
+int btrfs_validate_prop(const char *name, const char *value, size_t value_len)
+{
+	const struct prop_handler *handler;
+
+	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
+		return -EINVAL;
+
+	handler = find_prop_handler(name, NULL);
+	if (!handler)
+		return -EINVAL;
+
+	if (value_len == 0)
+		return 0;
+
+	return handler->validate(value, value_len);
+}
+
 static int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
 			  const char *name, const char *value, size_t value_len,
 			  int flags)
@@ -62,9 +79,6 @@ static int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
 	const struct prop_handler *handler;
 	int ret;
 
-	if (strlen(name) <= XATTR_BTRFS_PREFIX_LEN)
-		return -EINVAL;
-
 	handler = find_prop_handler(name, NULL);
 	if (!handler)
 		return -EINVAL;
@@ -85,9 +99,6 @@ static int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
 		return ret;
 	}
 
-	ret = handler->validate(value, value_len);
-	if (ret)
-		return ret;
 	if (trans)
 		ret = btrfs_setxattr(trans, inode, handler->xattr_name, value,
 				     value_len, flags);
diff --git a/fs/btrfs/props.h b/fs/btrfs/props.h
index b1a6b233b774..01d2c1899bc7 100644
--- a/fs/btrfs/props.h
+++ b/fs/btrfs/props.h
@@ -12,6 +12,7 @@ void __init btrfs_props_init(void);
 
 int btrfs_set_prop_trans(struct inode *inode, const char *name,
 			 const char *value, size_t value_len, int flags);
+int btrfs_validate_prop(const char *name, const char *value, size_t value_len);
 
 int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path);
 
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 10da873d11f5..807cc24dc885 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -373,7 +373,12 @@ static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
 					const char *name, const void *value,
 					size_t size, int flags)
 {
+	int ret;
+
 	name = xattr_full_name(handler, name);
+	ret = btrfs_validate_prop(name, value, size);
+	if (ret)
+		return ret;
 	return btrfs_set_prop_trans(inode, name, value, size, flags);
 }
 
-- 
2.17.1


  reply	other threads:[~2019-04-17 15:37 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-17 15:37 [PATCH 0/2 RFC] fix duplicate code in btrfs_ioctl_setflags Anand Jain
2019-04-17 15:37 ` Anand Jain [this message]
2019-04-17 15:37 ` [PATCH 2/2 RFC] btrfs: start transaction in btrfs_ioctl_setflags() Anand Jain
2019-04-18 13:23   ` David Sterba
2019-04-18 14:27     ` Anand Jain

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