From: Christoph Hellwig <hch@lst.de>
To: linux-xfs@vger.kernel.org
Cc: Dave Chinner <david@fromorbit.com>
Subject: [PATCH 03/11] xfs: remove ->b_offset handling for page backed buffers
Date: Wed, 19 May 2021 21:08:52 +0200 [thread overview]
Message-ID: <20210519190900.320044-4-hch@lst.de> (raw)
In-Reply-To: <20210519190900.320044-1-hch@lst.de>
->b_offset can only be non-zero for SLAB backed buffers, so remove all
code dealing with it for page backed buffers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_buf.c | 15 +++++----------
fs/xfs/xfs_buf.h | 3 ++-
2 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index ac85ec6f0a2fab..392b85d059bff5 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -79,7 +79,7 @@ static inline int
xfs_buf_vmap_len(
struct xfs_buf *bp)
{
- return (bp->b_page_count * PAGE_SIZE) - bp->b_offset;
+ return (bp->b_page_count * PAGE_SIZE);
}
/*
@@ -329,8 +329,7 @@ xfs_buf_free(
uint i;
if (xfs_buf_is_vmapped(bp))
- vm_unmap_ram(bp->b_addr - bp->b_offset,
- bp->b_page_count);
+ vm_unmap_ram(bp->b_addr, bp->b_page_count);
for (i = 0; i < bp->b_page_count; i++) {
struct page *page = bp->b_pages[i];
@@ -386,7 +385,7 @@ xfs_buf_alloc_pages(
uint flags)
{
size_t size;
- size_t nbytes, offset;
+ size_t nbytes;
gfp_t gfp_mask = xb_to_gfp(flags);
unsigned short page_count, i;
xfs_off_t start, end;
@@ -407,7 +406,6 @@ xfs_buf_alloc_pages(
if (unlikely(error))
return error;
- offset = bp->b_offset;
bp->b_flags |= _XBF_PAGES;
for (i = 0; i < bp->b_page_count; i++) {
@@ -441,10 +439,9 @@ xfs_buf_alloc_pages(
XFS_STATS_INC(bp->b_mount, xb_page_found);
- nbytes = min_t(size_t, size, PAGE_SIZE - offset);
+ nbytes = min_t(size_t, size, PAGE_SIZE);
size -= nbytes;
bp->b_pages[i] = page;
- offset = 0;
}
return 0;
@@ -466,7 +463,7 @@ _xfs_buf_map_pages(
ASSERT(bp->b_flags & _XBF_PAGES);
if (bp->b_page_count == 1) {
/* A single page buffer is always mappable */
- bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
+ bp->b_addr = page_address(bp->b_pages[0]);
} else if (flags & XBF_UNMAPPED) {
bp->b_addr = NULL;
} else {
@@ -493,7 +490,6 @@ _xfs_buf_map_pages(
if (!bp->b_addr)
return -ENOMEM;
- bp->b_addr += bp->b_offset;
}
return 0;
@@ -1726,7 +1722,6 @@ xfs_buf_offset(
if (bp->b_addr)
return bp->b_addr + offset;
- offset += bp->b_offset;
page = bp->b_pages[offset >> PAGE_SHIFT];
return page_address(page) + (offset & (PAGE_SIZE-1));
}
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 459ca34f26f588..21b4c58fd2fa87 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -167,7 +167,8 @@ struct xfs_buf {
atomic_t b_pin_count; /* pin count */
atomic_t b_io_remaining; /* #outstanding I/O requests */
unsigned int b_page_count; /* size of page array */
- unsigned int b_offset; /* page offset in first page */
+ unsigned int b_offset; /* page offset in first page,
+ only used for SLAB buffers */
int b_error; /* error code on I/O */
/*
--
2.30.2
next prev parent reply other threads:[~2021-05-19 19:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 19:08 RFC: buffer cache backing page allocation cleanup Christoph Hellwig
2021-05-19 19:08 ` [PATCH 01/11] xfs: cleanup error handling in xfs_buf_get_map Christoph Hellwig
2021-05-20 23:43 ` Darrick J. Wong
2021-05-19 19:08 ` [PATCH 02/11] xfs: split xfs_buf_allocate_memory Christoph Hellwig
2021-05-19 22:36 ` Dave Chinner
2021-05-19 19:08 ` Christoph Hellwig [this message]
2021-05-19 22:27 ` [PATCH 03/11] xfs: remove ->b_offset handling for page backed buffers Dave Chinner
2021-05-19 19:08 ` [PATCH 04/11] xfs: cleanup _xfs_buf_get_pages Christoph Hellwig
2021-05-19 22:40 ` Dave Chinner
2021-05-20 5:23 ` Christoph Hellwig
2021-05-25 22:43 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 05/11] xfs: remove the xb_page_found stat counter in xfs_buf_alloc_pages Christoph Hellwig
2021-05-19 22:55 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 06/11] xfs: remove the size and nbytes variables " Christoph Hellwig
2021-05-19 22:56 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 07/11] xfs: simplify the b_page_count calculation Christoph Hellwig
2021-05-19 19:08 ` [PATCH 08/11] xfs: centralize page allocation and freeing for buffers Christoph Hellwig
2021-05-19 23:22 ` Dave Chinner
2021-05-20 5:35 ` Christoph Hellwig
2021-05-25 23:59 ` Dave Chinner
2021-05-19 19:08 ` [PATCH 09/11] xfs: lift the buffer zeroing logic into xfs_buf_alloc_pages Christoph Hellwig
2021-05-19 19:08 ` [PATCH 10/11] xfs: retry allocations from xfs_buf_get_uncached as well Christoph Hellwig
2021-05-19 19:09 ` [PATCH 11/11] xfs: use alloc_pages_bulk_array() for buffers Christoph Hellwig
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=20210519190900.320044-4-hch@lst.de \
--to=hch@lst.de \
--cc=david@fromorbit.com \
--cc=linux-xfs@vger.kernel.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.