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authorGoldwyn Rodrigues <rgoldwyn@suse.com>2017-06-20 15:05:45 +0300
committerJens Axboe <axboe@kernel.dk>2017-06-20 16:12:03 +0300
commita38d1243704f501a4c42de1db1062ff6eba83453 (patch)
treea5dfc333eccc3ecb99b4bf5de17436215121c835 /fs
parent6be96d3ad34a124450028dabba43f07fe1d0c86d (diff)
downloadlinux-a38d1243704f501a4c42de1db1062ff6eba83453.tar.xz
fs: Introduce IOMAP_NOWAIT
IOCB_NOWAIT translates to IOMAP_NOWAIT for iomaps. This is used by XFS in the XFS patch. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/iomap.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/iomap.c b/fs/iomap.c
index 18f2f2b8ba2c..c71a64b97fba 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -881,6 +881,14 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
flags |= IOMAP_WRITE;
}
+ if (iocb->ki_flags & IOCB_NOWAIT) {
+ if (filemap_range_has_page(mapping, start, end)) {
+ ret = -EAGAIN;
+ goto out_free_dio;
+ }
+ flags |= IOMAP_NOWAIT;
+ }
+
ret = filemap_write_and_wait_range(mapping, start, end);
if (ret)
goto out_free_dio;