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    Subject[PATCH 4.19 617/639] 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 18b9b7ca20c92..4961d32ccd1e0 100644
    --- a/fs/afs/super.c
    +++ b/fs/afs/super.c
    @@ -393,6 +393,7 @@ 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


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