From: Allison Collins <allison.henderson@oracle.com>
To: Christoph Hellwig <hch@lst.de>,
Goldwyn Rodrigues <rgoldwyn@suse.com>,
linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 01/19] iomap: better document the IOMAP_F_* flags
Date: Fri, 13 Sep 2019 17:42:06 -0700 [thread overview]
Message-ID: <3a7fd51f-65a4-0a5e-40d9-fc59e8f90342@oracle.com> (raw)
In-Reply-To: <20190909182722.16783-2-hch@lst.de>
Looks good to me, I think the new comments are a lot more helpful
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
On 9/9/19 11:27 AM, Christoph Hellwig wrote:
> The documentation for IOMAP_F_* is a bit disorganized, and doesn't
> mention the fact that most flags are set by the file system and consumed
> by the iomap core, while IOMAP_F_SIZE_CHANGED is set by the core and
> consumed by the file system.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> include/linux/iomap.h | 31 +++++++++++++++++++++++--------
> 1 file changed, 23 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index e79af6b28410..8adcc8dd4498 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -30,21 +30,36 @@ struct vm_fault;
> #define IOMAP_INLINE 0x05 /* data inline in the inode */
>
> /*
> - * Flags for all iomap mappings:
> + * Flags reported by the file system from iomap_begin:
> + *
> + * IOMAP_F_NEW indicates that the blocks have been newly allocated and need
> + * zeroing for areas that no data is copied to.
> *
> * IOMAP_F_DIRTY indicates the inode has uncommitted metadata needed to access
> * written data and requires fdatasync to commit them to persistent storage.
> + *
> + * IOMAP_F_SHARED indicates that the blocks are shared, and will need to be
> + * unshared as part a write.
> + *
> + * IOMAP_F_MERGED indicates that the iomap contains the merge of multiple block
> + * mappings.
> + *
> + * IOMAP_F_BUFFER_HEAD indicates that the file system requires the use of
> + * buffer heads for this mapping.
> */
> -#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
> -#define IOMAP_F_DIRTY 0x02 /* uncommitted metadata */
> -#define IOMAP_F_BUFFER_HEAD 0x04 /* file system requires buffer heads */
> -#define IOMAP_F_SIZE_CHANGED 0x08 /* file size has changed */
> +#define IOMAP_F_NEW 0x01
> +#define IOMAP_F_DIRTY 0x02
> +#define IOMAP_F_SHARED 0x04
> +#define IOMAP_F_MERGED 0x08
> +#define IOMAP_F_BUFFER_HEAD 0x10
>
> /*
> - * Flags that only need to be reported for IOMAP_REPORT requests:
> + * Flags set by the core iomap code during operations:
> + *
> + * IOMAP_F_SIZE_CHANGED indicates to the iomap_end method that the file size
> + * has changed as the result of this write operation.
> */
> -#define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */
> -#define IOMAP_F_SHARED 0x20 /* block shared with another file */
> +#define IOMAP_F_SIZE_CHANGED 0x100
>
> /*
> * Flags from 0x1000 up are for file system specific usage:
>
next prev parent reply other threads:[~2019-09-14 0:42 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 18:27 iomap and xfs COW cleanups Christoph Hellwig
2019-09-09 18:27 ` [PATCH 01/19] iomap: better document the IOMAP_F_* flags Christoph Hellwig
2019-09-14 0:42 ` Allison Collins [this message]
2019-09-16 18:08 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 02/19] iomap: remove the unused iomap argument to __iomap_write_end Christoph Hellwig
2019-09-14 0:42 ` Allison Collins
2019-09-16 18:10 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 03/19] iomap: always use AOP_FLAG_NOFS in iomap_write_begin Christoph Hellwig
2019-09-16 18:11 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 04/19] iomap: ignore non-shared or non-data blocks in xfs_file_dirty Christoph Hellwig
2019-09-16 18:12 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 05/19] iomap: move the zeroing case out of iomap_read_page_sync Christoph Hellwig
2019-09-16 18:17 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 06/19] iomap: use write_begin to read pages to unshare Christoph Hellwig
2019-09-16 18:34 ` Darrick J. Wong
2019-09-30 11:07 ` Christoph Hellwig
2019-10-08 15:12 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 07/19] iomap: use a srcmap for a read-modify-write I/O Christoph Hellwig
2019-09-10 12:48 ` Goldwyn Rodrigues
2019-09-10 14:39 ` hch
2019-09-16 17:57 ` Darrick J. Wong
2019-09-16 18:42 ` Darrick J. Wong
2019-09-18 18:15 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 08/19] xfs: also call xfs_file_iomap_end_delalloc for zeroing operations Christoph Hellwig
2019-09-18 17:09 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 09/19] xfs: remove xfs_reflink_dirty_extents Christoph Hellwig
2019-09-18 17:17 ` Darrick J. Wong
2019-09-18 17:25 ` Christoph Hellwig
2019-09-18 17:31 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 10/19] xfs: pass two imaps to xfs_reflink_allocate_cow Christoph Hellwig
2019-09-18 17:26 ` Darrick J. Wong
2019-09-30 11:10 ` Christoph Hellwig
2019-09-09 18:27 ` [PATCH 11/19] xfs: refactor xfs_file_iomap_begin_delay Christoph Hellwig
2019-09-18 17:30 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 12/19] xfs: fill out the srcmap in iomap_begin Christoph Hellwig
2019-09-18 17:52 ` Darrick J. Wong
2019-10-01 6:26 ` Christoph Hellwig
2019-09-09 18:27 ` [PATCH 13/19] xfs: factor out a helper to calculate the end_fsb Christoph Hellwig
2019-09-14 0:42 ` Allison Collins
2019-09-18 17:55 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 14/19] xfs: split out a new set of read-only iomap ops Christoph Hellwig
2019-09-18 17:56 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 15/19] xfs: move xfs_file_iomap_begin_delay around Christoph Hellwig
2019-09-18 17:59 ` Darrick J. Wong
2019-09-30 11:14 ` Christoph Hellwig
2019-09-09 18:27 ` [PATCH 16/19] xfs: split the iomap ops for buffered vs direct writes Christoph Hellwig
2019-09-18 18:00 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 17/19] xfs: rename the whichfork variable in xfs_buffered_write_iomap_begin Christoph Hellwig
2019-09-14 0:42 ` Allison Collins
2019-09-18 18:00 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 18/19] xfs: cleanup xfs_iomap_write_unwritten Christoph Hellwig
2019-09-18 18:06 ` Darrick J. Wong
2019-09-09 18:27 ` [PATCH 19/19] xfs: improve the IOMAP_NOWAIT check for COW inodes Christoph Hellwig
2019-09-18 18:09 ` Darrick J. Wong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3a7fd51f-65a4-0a5e-40d9-fc59e8f90342@oracle.com \
--to=allison.henderson@oracle.com \
--cc=hch@lst.de \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-xfs@vger.kernel.org \
--cc=rgoldwyn@suse.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).