linux-kernel - [PATCH v3 2/4] ext4: allocate extended attribute value in vmalloc area

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Message-Id: <20221208023233.1231330-3-yebin@huaweicloud.com>
Date:   Thu,  8 Dec 2022 10:32:31 +0800
From:   Ye Bin <yebin@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jack@...e.cz,
        Ye Bin <yebin10@...wei.com>
Subject: [PATCH v3 2/4] ext4: allocate extended attribute value in vmalloc area

From: Ye Bin <yebin10@...wei.com>

Now, extended attribute value maximum length is 64K. The memory requested
here does not need continuous physical addresses, so it is appropriate to
use kvmalloc to request memory. At the same time, it can also cope with
the situation that the extended attribute will become longer in the future.

Signed-off-by: Ye Bin <yebin10@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/xattr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 718ef3987f94..23cfefc6d262 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2556,7 +2556,7 @@ static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
 
 	is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
 	bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
-	buffer = kmalloc(value_size, GFP_NOFS);
+	buffer = kvmalloc(value_size, GFP_NOFS);
 	b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
 	if (!is || !bs || !buffer || !b_entry_name) {
 		error = -ENOMEM;
@@ -2608,7 +2608,7 @@ static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
 	error = 0;
 out:
 	kfree(b_entry_name);
-	kfree(buffer);
+	kvfree(buffer);
 	if (is)
 		brelse(is->iloc.bh);
 	if (bs)
-- 
2.31.1