From d8feeea359a9b5e06e099f8955bc0390d696e6de Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Fri, 3 Jan 2014 14:10:25 +1100 Subject: [PATCH] fat: fallback to buffered write in case of fallocatded region on direct IO For normal cases of direct IO write, trying to seek to location greater than file size, makes it fall back to buffered write to fill that region. Similarly, in case for write in Fallocated region, make it fall to buffered write. Signed-off-by: Namjae Jeon Signed-off-by: Amit Sahrawat Cc: OGAWA Hirofumi Signed-off-by: Andrew Morton --- fs/fat/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 7a547ee0d567..ffa2eccc62a2 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -218,6 +218,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, loff_t size = offset + iov_length(iov, nr_segs); if (MSDOS_I(inode)->mmu_private < size) return 0; + + /* + * In case of writing in fallocated region, return 0 and + * fallback to buffered write. + */ + if (MSDOS_I(inode)->i_disksize > + round_up(i_size_read(inode), inode->i_sb->s_blocksize)) + return 0; } /* -- 2.39.5