linux-kernel - [PATCH v2 2/2] f2fs: move the conditional statement after holding the inode lock in f2fs

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Message-Id: <20230506144257.9611-2-frank.li@vivo.com>
Date:   Sat,  6 May 2023 22:42:57 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     jaegeuk@...nel.org, chao@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Yangtao Li <frank.li@...o.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH v2 2/2] f2fs: move the conditional statement after holding the inode lock in f2fs_fallocate()

For judging the inode flag state, the inode lock must be held.

Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Fixes: fcc85a4d86b5 ("f2fs crypto: activate encryption support for fs APIs")
Signed-off-by: Yangtao Li <frank.li@...o.com>
---
v2:
-add unlock
 fs/f2fs/file.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 42a9b683118c..0dbbcb406d3f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1801,9 +1801,18 @@ static long f2fs_fallocate(struct file *file, int mode,
 	if (!S_ISREG(inode->i_mode))
 		return -EINVAL;
 
+	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
+			FALLOC_FL_INSERT_RANGE))
+		return -EOPNOTSUPP;
+
+	inode_lock(inode);
+
 	if (IS_ENCRYPTED(inode) &&
-		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
+		(mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE))) {
+		inode_unlock(inode);
 		return -EOPNOTSUPP;
+	}
 
 	/*
 	 * Pinned file should not support partial truncation since the block
@@ -1811,15 +1820,10 @@ static long f2fs_fallocate(struct file *file, int mode,
 	 */
 	if ((f2fs_compressed_file(inode) || f2fs_is_pinned_file(inode)) &&
 		(mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
-			FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE)))
-		return -EOPNOTSUPP;
-
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
-			FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
-			FALLOC_FL_INSERT_RANGE))
+			FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE))) {
+		inode_unlock(inode);
 		return -EOPNOTSUPP;
-
-	inode_lock(inode);
+	}
 
 	ret = file_modified(file);
 	if (ret)
-- 
2.39.0