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Subject[PATCH 4.9 220/271] afs: Fix large file support
Date
From: Marc Dionne <marc.dionne@auristor.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@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/afs/super.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/fs/afs/super.c b/fs/afs/super.c
index fbdb022b75a27..65389394e2028 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -317,6 +317,7 @@ 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;
sb->s_bdi = &as->volume->bdi;
--
2.20.1


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