linux-kernel - [PATCH AUTOSEL 4.19 608/671] afs: Fix large file support

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Message-Id: <20200116170509.12787-345-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 12:04:06 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        David Howells <dhowells@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-afs@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 608/671] afs: Fix large file support

From: Marc Dionne <marc.dionne@...istor.com>

[ Upstream commit b485275f1aca8a9da37fd35e4fad673935e827da ]

By default s_maxbytes is set to MAX_NON_LFS, which limits the usable
file size to 2GB, enforced by the vfs.

Commit b9b1f8d5930a ("AFS: write support fixes") added support for the
64-bit fetch and store server operations, but did not change this value.
As a result, attempts to write past the 2G mark result in EFBIG errors:

 $ dd if=/dev/zero of=foo bs=1M count=1 seek=2048
 dd: error writing 'foo': File too large

Set s_maxbytes to MAX_LFS_FILESIZE.

Fixes: b9b1f8d5930a ("AFS: write support fixes")
Signed-off-by: Marc Dionne <marc.dionne@...istor.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/afs/super.c b/fs/afs/super.c
index bd2608297473..9e0ab2be27f7 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -392,6 +392,7 @@ static int afs_fill_super(struct super_block *sb,
 	/* fill in the superblock */
 	sb->s_blocksize		= PAGE_SIZE;
 	sb->s_blocksize_bits	= PAGE_SHIFT;
+	sb->s_maxbytes		= MAX_LFS_FILESIZE;
 	sb->s_magic		= AFS_FS_MAGIC;
 	sb->s_op		= &afs_super_ops;
 	if (!as->dyn_root)
-- 
2.20.1