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Date: Sun, 17 Nov 2013 20:38:23 +0900 From: Namjae Jeon <linkinjeon@...il.com> To: hirofumi@...l.parknet.co.jp, akpm@...ux-foundation.org Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>, Namjae Jeon <namjae.jeon@...sung.com>, Amit Sahrawat <a.sahrawat@...sung.com> Subject: [PATCH v2 4/5] fat: fallback to buffered write in case of fallocatded region on direct IO From: Namjae Jeon <namjae.jeon@...sung.com> 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 <namjae.jeon@...sung.com> Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com> --- fs/fat/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 12a37a9..c9fb9b6 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -217,6 +217,14 @@ static ssize_t fat_direct_IO(int rw, struct kiocb *iocb, loff_t size = offset + iov_iter_count(iter); 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; } /* -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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