public inbox for [email protected]
 help / color / mirror / Atom feed
From: Stefan Roesch <[email protected]>
To: <[email protected]>, <[email protected]>,
	<[email protected]>, <[email protected]>,
	<[email protected]>
Cc: <[email protected]>, <[email protected]>
Subject: [RFC PATCH v1 06/18] xfs: add iomap async buffered write support
Date: Tue, 26 Apr 2022 10:43:23 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This adds the async buffered write support to the iomap layer of XFS. If
a lock cannot be acquired or additional reads need to be performed, the
request will return -EAGAIN in case this is an async buffered write request.

Signed-off-by: Stefan Roesch <[email protected]>
---
 fs/xfs/xfs_iomap.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index e552ce541ec2..80b6c48e88af 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -881,18 +881,28 @@ xfs_buffered_write_iomap_begin(
 	bool			eof = false, cow_eof = false, shared = false;
 	int			allocfork = XFS_DATA_FORK;
 	int			error = 0;
+	bool			no_wait = (flags & IOMAP_NOWAIT);
 
 	if (xfs_is_shutdown(mp))
 		return -EIO;
 
 	/* we can't use delayed allocations when using extent size hints */
-	if (xfs_get_extsz_hint(ip))
+	if (xfs_get_extsz_hint(ip)) {
+		if (no_wait)
+			return -EAGAIN;
+
 		return xfs_direct_write_iomap_begin(inode, offset, count,
 				flags, iomap, srcmap);
+	}
 
 	ASSERT(!XFS_IS_REALTIME_INODE(ip));
 
-	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	if (no_wait) {
+		if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
+			return -EAGAIN;
+	} else {
+		xfs_ilock(ip, XFS_ILOCK_EXCL);
+	}
 
 	if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
 	    XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
@@ -902,6 +912,11 @@ xfs_buffered_write_iomap_begin(
 
 	XFS_STATS_INC(mp, xs_blk_mapw);
 
+	if (no_wait && xfs_need_iread_extents(XFS_IFORK_PTR(ip, XFS_DATA_FORK))) {
+		error = -EAGAIN;
+		goto out_unlock;
+	}
+
 	error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
 	if (error)
 		goto out_unlock;
@@ -933,6 +948,10 @@ xfs_buffered_write_iomap_begin(
 	if (xfs_is_cow_inode(ip)) {
 		if (!ip->i_cowfp) {
 			ASSERT(!xfs_is_reflink_inode(ip));
+			if (no_wait) {
+				error = -EAGAIN;
+				goto out_unlock;
+			}
 			xfs_ifork_init_cow(ip);
 		}
 		cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
@@ -956,6 +975,11 @@ xfs_buffered_write_iomap_begin(
 			goto found_imap;
 		}
 
+		if (no_wait) {
+			error = -EAGAIN;
+			goto out_unlock;
+		}
+
 		xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
 
 		/* Trim the mapping to the nearest shared extent boundary. */
@@ -993,6 +1017,11 @@ xfs_buffered_write_iomap_begin(
 			allocfork = XFS_COW_FORK;
 	}
 
+	if (no_wait) {
+		error = -EAGAIN;
+		goto out_unlock;
+	}
+
 	error = xfs_qm_dqattach_locked(ip, false);
 	if (error)
 		goto out_unlock;
-- 
2.30.2


  parent reply	other threads:[~2022-04-26 17:44 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-26 17:43 [RFC PATCH v1 00/18] io-uring/xfs: support async buffered writes Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 01/18] block: add check for async buffered writes to generic_write_checks Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 02/18] mm: add FGP_ATOMIC flag to __filemap_get_folio() Stefan Roesch
2022-04-26 19:06   ` Matthew Wilcox
2022-04-28 19:54     ` Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 03/18] iomap: add iomap_page_create_gfp to allocate iomap_pages Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 04/18] iomap: use iomap_page_create_gfp() in __iomap_write_begin Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 05/18] iomap: add async buffered write support Stefan Roesch
2022-04-26 17:43 ` Stefan Roesch [this message]
2022-04-26 22:54   ` [RFC PATCH v1 06/18] xfs: add iomap " Dave Chinner
2022-04-28 20:03     ` Stefan Roesch
2022-04-28 21:44       ` Dave Chinner
2022-04-26 17:43 ` [RFC PATCH v1 07/18] fs: split off need_remove_file_privs() do_remove_file_privs() Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 08/18] fs: split off need_file_update_time and do_file_update_time Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 09/18] fs: add pending file update time flag Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 10/18] xfs: Enable async write file modification handling Stefan Roesch
2022-04-26 22:55   ` Dave Chinner
2022-04-27 12:07   ` Christian Brauner
2022-04-26 17:43 ` [RFC PATCH v1 11/18] xfs: add async buffered write support Stefan Roesch
2022-04-26 22:56   ` Dave Chinner
2022-04-28 19:58     ` Stefan Roesch
2022-04-28 21:54       ` Dave Chinner
2022-05-02 21:21         ` Stefan Roesch
2022-05-06  9:29           ` Dave Chinner
2022-05-09 19:32             ` Stefan Roesch
2022-05-09 23:24               ` Dave Chinner
2022-05-09 23:44                 ` Darrick J. Wong
2022-05-10  1:12                   ` Dave Chinner
2022-05-10  6:47                     ` Christoph Hellwig
2022-05-16  2:24                       ` Dave Chinner
2022-05-16 13:39                         ` Christoph Hellwig
2022-04-26 17:43 ` [RFC PATCH v1 12/18] io_uring: add support for async buffered writes Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 13/18] io_uring: add tracepoint for short writes Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 14/18] sched: add new fields to task_struct Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 15/18] mm: support write throttling for async buffered writes Stefan Roesch
2022-04-28 17:47   ` Jan Kara
2022-04-28 20:16     ` Stefan Roesch
2022-05-10  9:50       ` Jan Kara
2022-05-10 20:16         ` Stefan Roesch
2022-05-11 10:38           ` Jan Kara
2022-05-13 18:57             ` Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 16/18] iomap: User " Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 17/18] io_uring: support write " Stefan Roesch
2022-04-26 17:43 ` [RFC PATCH v1 18/18] xfs: enable async buffered write support Stefan Roesch
2022-04-26 22:37 ` [RFC PATCH v1 00/18] io-uring/xfs: support async buffered writes Dave Chinner

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 \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /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