Subject: + fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch added to -mm tree
To: namjae.jeon@xxxxxxxxxxx,a.sahrawat@xxxxxxxxxxx,hirofumi@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 18 Nov 2013 15:22:43 -0800
The patch titled
Subject: fat: fallback to buffered write in case of fallocatded region on direct IO
has been added to the -mm tree. Its filename is
fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch
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From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: 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 <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/inode.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff -puN fs/fat/inode.c~fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io fs/fat/inode.c
--- a/fs/fat/inode.c~fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io
+++ a/fs/fat/inode.c
@@ -218,6 +218,14 @@ static ssize_t fat_direct_IO(int rw, str
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;
}
/*
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-add-i_disksize-to-represent-uninitialized-size.patch
fat-add-fat_fallocate-operation.patch
fat-zero-out-seek-range-on-_fat_get_block.patch
fat-fallback-to-buffered-write-in-case-of-fallocatded-region-on-direct-io.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
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