linux-ext4 - [PATCH 4/4] ext4: add mask of ext4 flags to swap

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Date:   Thu, 10 Jan 2019 11:36:50 +0800
From:   yangerkun <yangerkun@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     <miaoxie@...wei.com>, <houtao1@...wei.com>, <yi.zhang@...wei.com>,
        <yangerkun@...wei.com>
Subject: [PATCH 4/4] ext4: add mask of ext4 flags to swap

Not all flags should be swap, add a mask to do this.

Signed-off-by: yangerkun <yangerkun@...wei.com>
---
 fs/ext4/ext4.h  | 4 ++++
 fs/ext4/ioctl.c | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3f89d0a..b438a7c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -426,6 +426,10 @@ struct flex_groups {
 /* Flags that are appropriate for non-directories/regular files. */
 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
 
+/* Flags that should be swap */
+#define EXT4_FL_SHOULD_SWAP (EXT4_COMPR_FL | EXT4_COMPRBLK_FL | EXT4_NOCOMPR_FL |\
+			EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
+
 /* Mask out flags that are inappropriate for the given type of inode. */
 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
 {
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 60d406f..53e26a6 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -66,6 +66,7 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 	struct inode *big_inode;
 	struct inode *small_inode;
 	qsize_t size1, size2, diff;
+	unsigned long tmp;
 
 	ei1 = EXT4_I(inode1);
 	ei2 = EXT4_I(inode2);
@@ -75,7 +76,10 @@ static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 	swap(inode1->i_mtime, inode2->i_mtime);
 
 	memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
-	swap(ei1->i_flags, ei2->i_flags);
+	tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
+	ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
+		(ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
+	ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 	swap(ei1->i_disksize, ei2->i_disksize);
 	ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 	ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
-- 
2.9.5