From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: sandeen@redhat.com, linux-nfs@vger.kernel.org,
linux-cifs@vger.kernel.org, linux-unionfs@vger.kernel.org,
linux-xfs@vger.kernel.org, linux-mm@kvack.org,
linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
ocfs2-devel@oss.oracle.com
Subject: [PATCH 25/26] xfs: support returning partial reflink results
Date: Mon, 15 Oct 2018 20:20:55 -0700 [thread overview]
Message-ID: <153966005536.3607.787445581785795364.stgit@magnolia> (raw)
In-Reply-To: <153965939489.1256.7400115244528045860.stgit@magnolia>
From: Darrick J. Wong <darrick.wong@oracle.com>
Back when the XFS reflink code only supported clone_file_range, we were
only able to return zero or negative error codes to userspace. However,
now that copy_file_range (which returns bytes copied) can use XFS'
clone_file_range, we have the opportunity to return partial results.
For example, if userspace sends a 1GB clone request and we run out of
space halfway through, we at least can tell userspace that we completed
512M of that request like a regular write.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/xfs_file.c | 5 +----
fs/xfs/xfs_reflink.c | 20 +++++++++++++++-----
fs/xfs/xfs_reflink.h | 2 +-
3 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 38fde4e11714..7d42ab8fe6e1 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -928,14 +928,11 @@ xfs_file_remap_range(
loff_t len,
unsigned int remap_flags)
{
- int ret;
-
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
return -EINVAL;
- ret = xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out,
len, remap_flags);
- return ret < 0 ? ret : len;
}
STATIC int
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index e8e86646bb4b..af3368862c56 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1123,6 +1123,7 @@ xfs_reflink_remap_blocks(
struct xfs_inode *dest,
xfs_fileoff_t destoff,
xfs_filblks_t len,
+ xfs_filblks_t *remapped_len,
xfs_off_t new_isize)
{
struct xfs_bmbt_irec imap;
@@ -1130,6 +1131,7 @@ xfs_reflink_remap_blocks(
int error = 0;
xfs_filblks_t range_len;
+ *remapped_len = 0;
/* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */
while (len) {
uint lock_mode;
@@ -1168,6 +1170,7 @@ xfs_reflink_remap_blocks(
srcoff += range_len;
destoff += range_len;
len -= range_len;
+ *remapped_len += range_len;
}
return 0;
@@ -1382,7 +1385,7 @@ xfs_reflink_remap_prep(
/*
* Link a range of blocks from one file to another.
*/
-int
+loff_t
xfs_reflink_remap_range(
struct file *file_in,
loff_t pos_in,
@@ -1397,9 +1400,10 @@ xfs_reflink_remap_range(
struct xfs_inode *dest = XFS_I(inode_out);
struct xfs_mount *mp = src->i_mount;
xfs_fileoff_t sfsbno, dfsbno;
- xfs_filblks_t fsblen;
+ xfs_filblks_t fsblen, remappedfsb = 0;
+ loff_t remapped_bytes = 0;
xfs_extlen_t cowextsize;
- ssize_t ret;
+ int ret;
if (!xfs_sb_version_hasreflink(&mp->m_sb))
return -EOPNOTSUPP;
@@ -1415,11 +1419,17 @@ xfs_reflink_remap_range(
trace_xfs_reflink_remap_range(src, pos_in, len, dest, pos_out);
+ if (len == 0) {
+ ret = 0;
+ goto out_unlock;
+ }
+
dfsbno = XFS_B_TO_FSBT(mp, pos_out);
sfsbno = XFS_B_TO_FSBT(mp, pos_in);
fsblen = XFS_B_TO_FSB(mp, len);
ret = xfs_reflink_remap_blocks(src, sfsbno, dest, dfsbno, fsblen,
- pos_out + len);
+ &remappedfsb, pos_out + len);
+ remapped_bytes = min_t(loff_t, len, XFS_FSB_TO_B(mp, remappedfsb));
if (ret)
goto out_unlock;
@@ -1442,7 +1452,7 @@ xfs_reflink_remap_range(
xfs_reflink_remap_unlock(file_in, file_out);
if (ret)
trace_xfs_reflink_remap_range_error(dest, ret, _RET_IP_);
- return ret;
+ return remapped_bytes > 0 ? remapped_bytes : ret;
}
/*
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index c3c46c276fe1..cbc26ff79a8f 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -27,7 +27,7 @@ extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t count);
extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
-extern int xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
+extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out, loff_t len,
unsigned int remap_flags);
extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
next prev parent reply other threads:[~2018-10-16 3:21 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 3:09 [PATCH v5 00/26] fs: fixes for serious clone/dedupe problems Darrick J. Wong
2018-10-16 3:10 ` [PATCH 01/26] xfs: add a per-xfs trace_printk macro Darrick J. Wong
2018-10-16 3:10 ` [PATCH 02/26] vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF Darrick J. Wong
2018-10-16 3:10 ` [PATCH 03/26] vfs: check file ranges before cloning files Darrick J. Wong
2018-10-16 3:10 ` [PATCH 04/26] vfs: exit early from zero length remap operations Darrick J. Wong
2018-10-17 8:26 ` Christoph Hellwig
2018-10-16 3:10 ` [PATCH 05/26] vfs: strengthen checking of file range inputs to generic_remap_checks Darrick J. Wong
2018-10-16 3:10 ` [PATCH 06/26] vfs: avoid problematic remapping requests into partial EOF block Darrick J. Wong
2018-10-16 3:10 ` [PATCH 07/26] vfs: skip zero-length dedupe requests Darrick J. Wong
2018-10-16 3:10 ` [PATCH 08/26] vfs: rename vfs_clone_file_prep to be more descriptive Darrick J. Wong
2018-10-16 3:10 ` [PATCH 09/26] vfs: rename clone_verify_area to remap_verify_area Darrick J. Wong
2018-10-16 3:11 ` [PATCH 10/26] vfs: combine the clone and dedupe into a single remap_file_range Darrick J. Wong
2018-10-17 8:28 ` Christoph Hellwig
2018-10-16 3:11 ` [PATCH 11/26] vfs: pass remap flags to generic_remap_file_range_prep Darrick J. Wong
2018-10-17 8:28 ` Christoph Hellwig
2018-10-16 3:11 ` [PATCH 12/26] vfs: pass remap flags to generic_remap_checks Darrick J. Wong
2018-10-17 8:29 ` Christoph Hellwig
2018-10-16 3:19 ` [PATCH 13/26] vfs: create generic_remap_file_range_touch to update inode metadata Darrick J. Wong
2018-10-17 8:33 ` Christoph Hellwig
2018-10-16 3:19 ` [PATCH 14/26] vfs: make remap_file_range functions take and return bytes completed Darrick J. Wong
2018-10-16 3:19 ` [PATCH 15/26] vfs: plumb remap flags through the vfs clone functions Darrick J. Wong
2018-10-16 3:19 ` [PATCH 16/26] vfs: plumb remap flags through the vfs dedupe functions Darrick J. Wong
2018-10-16 3:19 ` [PATCH 17/26] vfs: enable remap callers that can handle short operations Darrick J. Wong
2018-10-17 8:36 ` Christoph Hellwig
2018-10-17 16:35 ` Darrick J. Wong
2018-10-16 3:20 ` [PATCH 18/26] vfs: hide file range comparison function Darrick J. Wong
2018-10-16 3:20 ` [PATCH 19/26] vfs: clean up generic_remap_file_range_prep return value Darrick J. Wong
2018-10-17 8:37 ` Christoph Hellwig
2018-10-16 3:20 ` [PATCH 20/26] ocfs2: truncate page cache for clone destination file before remapping Darrick J. Wong
2018-10-16 3:20 ` [PATCH 21/26] ocfs2: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-16 3:20 ` [PATCH 22/26] ocfs2: support partial clone range and dedupe range Darrick J. Wong
2018-10-16 3:20 ` [PATCH 23/26] ocfs2: remove ocfs2_reflink_remap_range Darrick J. Wong
2018-10-16 3:20 ` [PATCH 24/26] xfs: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-17 8:37 ` Christoph Hellwig
2018-10-16 3:20 ` Darrick J. Wong [this message]
2018-10-17 8:40 ` [PATCH 25/26] xfs: support returning partial reflink results Christoph Hellwig
2018-10-17 16:40 ` Darrick J. Wong
2018-10-16 3:21 ` [PATCH 26/26] xfs: remove redundant remap partial EOF block checks Darrick J. Wong
2018-10-17 8:40 ` Christoph Hellwig
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