From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Christoph Hellwig To: linux-xfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 10/33] iomap: add an iomap-based bmap implementation Date: Wed, 9 May 2018 09:48:07 +0200 Message-Id: <20180509074830.16196-11-hch@lst.de> In-Reply-To: <20180509074830.16196-1-hch@lst.de> References: <20180509074830.16196-1-hch@lst.de> Sender: owner-linux-mm@kvack.org List-ID: This adds a simple iomap-based implementation of the legacy ->bmap interface. Note that we can't easily add checks for rt or reflink files, so these will have to remain in the callers. This interface just needs to die.. Signed-off-by: Christoph Hellwig --- fs/iomap.c | 29 +++++++++++++++++++++++++++++ include/linux/iomap.h | 3 +++ 2 files changed, 32 insertions(+) diff --git a/fs/iomap.c b/fs/iomap.c index af525cb47339..049e0c4aacac 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -1201,3 +1201,32 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, return ret; } EXPORT_SYMBOL_GPL(iomap_dio_rw); + +static loff_t +iomap_bmap_actor(struct inode *inode, loff_t pos, loff_t length, + void *data, struct iomap *iomap) +{ + sector_t *bno = data; + + if (iomap->type == IOMAP_MAPPED) + *bno = (iomap->addr + pos - iomap->offset) >> inode->i_blkbits; + return 0; +} + +/* legacy ->bmap interface. 0 is the error return (!) */ +sector_t +iomap_bmap(struct address_space *mapping, sector_t bno, + const struct iomap_ops *ops) +{ + struct inode *inode = mapping->host; + loff_t pos = bno >> inode->i_blkbits; + unsigned blocksize = i_blocksize(inode); + + if (filemap_write_and_wait(mapping)) + return 0; + + bno = 0; + iomap_apply(inode, pos, blocksize, 0, ops, &bno, iomap_bmap_actor); + return bno; +} +EXPORT_SYMBOL_GPL(iomap_bmap); diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 19a07de28212..07f73224c38b 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -4,6 +4,7 @@ #include +struct address_space; struct fiemap_extent_info; struct inode; struct iov_iter; @@ -95,6 +96,8 @@ loff_t iomap_seek_hole(struct inode *inode, loff_t offset, const struct iomap_ops *ops); loff_t iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops); +sector_t iomap_bmap(struct address_space *mapping, sector_t bno, + const struct iomap_ops *ops); /* * Flags for direct I/O ->end_io: -- 2.17.0