xfs: implement iomap based buffered write path
Convert XFS to use the new iomap based multipage write path. This involves implementing the ->iomap_begin and ->iomap_end methods, and switching the buffered file write, page_mkwrite and xfs_iozero paths to the new iomap helpers. With this change __xfs_get_blocks will never be used for buffered writes, and the code handling them can be removed. Based on earlier code from Dave Chinner. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig
Dave Chinner
parent
f0c6bcba74
commit
68a9f5e700
7 changed files with 187 additions and 258 deletions
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@ -4,6 +4,7 @@ config XFS_FS
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depends on (64BIT || LBDAF)
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select EXPORTFS
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select LIBCRC32C
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select FS_IOMAP
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help
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XFS is a high performance journaling filesystem which originated
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on the SGI IRIX platform. It is completely multi-threaded, can
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@ -1427,216 +1427,6 @@ xfs_vm_direct_IO(
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xfs_get_blocks_direct, endio, NULL, flags);
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}
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/*
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* Punch out the delalloc blocks we have already allocated.
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*
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* Don't bother with xfs_setattr given that nothing can have made it to disk yet
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* as the page is still locked at this point.
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*/
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STATIC void
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xfs_vm_kill_delalloc_range(
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struct inode *inode,
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loff_t start,
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loff_t end)
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{
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struct xfs_inode *ip = XFS_I(inode);
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xfs_fileoff_t start_fsb;
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xfs_fileoff_t end_fsb;
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int error;
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start_fsb = XFS_B_TO_FSB(ip->i_mount, start);
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end_fsb = XFS_B_TO_FSB(ip->i_mount, end);
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if (end_fsb <= start_fsb)
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return;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
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end_fsb - start_fsb);
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if (error) {
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/* something screwed, just bail */
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if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
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xfs_alert(ip->i_mount,
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"xfs_vm_write_failed: unable to clean up ino %lld",
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ip->i_ino);
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}
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}
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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STATIC void
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xfs_vm_write_failed(
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struct inode *inode,
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struct page *page,
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loff_t pos,
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unsigned len)
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{
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loff_t block_offset;
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loff_t block_start;
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loff_t block_end;
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loff_t from = pos & (PAGE_SIZE - 1);
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loff_t to = from + len;
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struct buffer_head *bh, *head;
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struct xfs_mount *mp = XFS_I(inode)->i_mount;
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/*
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* The request pos offset might be 32 or 64 bit, this is all fine
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* on 64-bit platform. However, for 64-bit pos request on 32-bit
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* platform, the high 32-bit will be masked off if we evaluate the
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* block_offset via (pos & PAGE_MASK) because the PAGE_MASK is
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* 0xfffff000 as an unsigned long, hence the result is incorrect
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* which could cause the following ASSERT failed in most cases.
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* In order to avoid this, we can evaluate the block_offset of the
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* start of the page by using shifts rather than masks the mismatch
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* problem.
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*/
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block_offset = (pos >> PAGE_SHIFT) << PAGE_SHIFT;
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ASSERT(block_offset + from == pos);
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head = page_buffers(page);
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block_start = 0;
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for (bh = head; bh != head || !block_start;
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bh = bh->b_this_page, block_start = block_end,
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block_offset += bh->b_size) {
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block_end = block_start + bh->b_size;
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/* skip buffers before the write */
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if (block_end <= from)
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continue;
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/* if the buffer is after the write, we're done */
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if (block_start >= to)
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break;
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/*
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* Process delalloc and unwritten buffers beyond EOF. We can
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* encounter unwritten buffers in the event that a file has
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* post-EOF unwritten extents and an extending write happens to
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* fail (e.g., an unaligned write that also involves a delalloc
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* to the same page).
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*/
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if (!buffer_delay(bh) && !buffer_unwritten(bh))
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continue;
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if (!xfs_mp_fail_writes(mp) && !buffer_new(bh) &&
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block_offset < i_size_read(inode))
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continue;
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if (buffer_delay(bh))
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xfs_vm_kill_delalloc_range(inode, block_offset,
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block_offset + bh->b_size);
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/*
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* This buffer does not contain data anymore. make sure anyone
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* who finds it knows that for certain.
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*/
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clear_buffer_delay(bh);
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clear_buffer_uptodate(bh);
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clear_buffer_mapped(bh);
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clear_buffer_new(bh);
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clear_buffer_dirty(bh);
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clear_buffer_unwritten(bh);
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}
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}
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/*
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* This used to call block_write_begin(), but it unlocks and releases the page
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* on error, and we need that page to be able to punch stale delalloc blocks out
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* on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at
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* the appropriate point.
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*/
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STATIC int
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xfs_vm_write_begin(
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struct file *file,
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struct address_space *mapping,
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loff_t pos,
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unsigned len,
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unsigned flags,
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struct page **pagep,
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void **fsdata)
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{
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pgoff_t index = pos >> PAGE_SHIFT;
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struct page *page;
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int status;
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struct xfs_mount *mp = XFS_I(mapping->host)->i_mount;
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ASSERT(len <= PAGE_SIZE);
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page = grab_cache_page_write_begin(mapping, index, flags);
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if (!page)
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return -ENOMEM;
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status = __block_write_begin(page, pos, len, xfs_get_blocks);
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if (xfs_mp_fail_writes(mp))
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status = -EIO;
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if (unlikely(status)) {
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struct inode *inode = mapping->host;
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size_t isize = i_size_read(inode);
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xfs_vm_write_failed(inode, page, pos, len);
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unlock_page(page);
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/*
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* If the write is beyond EOF, we only want to kill blocks
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* allocated in this write, not blocks that were previously
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* written successfully.
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*/
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if (xfs_mp_fail_writes(mp))
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isize = 0;
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if (pos + len > isize) {
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ssize_t start = max_t(ssize_t, pos, isize);
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truncate_pagecache_range(inode, start, pos + len);
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}
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put_page(page);
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page = NULL;
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}
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*pagep = page;
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return status;
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}
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/*
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* On failure, we only need to kill delalloc blocks beyond EOF in the range of
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* this specific write because they will never be written. Previous writes
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* beyond EOF where block allocation succeeded do not need to be trashed, so
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* only new blocks from this write should be trashed. For blocks within
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* EOF, generic_write_end() zeros them so they are safe to leave alone and be
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* written with all the other valid data.
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*/
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STATIC int
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xfs_vm_write_end(
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struct file *file,
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struct address_space *mapping,
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loff_t pos,
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unsigned len,
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unsigned copied,
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struct page *page,
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void *fsdata)
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{
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int ret;
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ASSERT(len <= PAGE_SIZE);
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ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
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if (unlikely(ret < len)) {
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struct inode *inode = mapping->host;
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size_t isize = i_size_read(inode);
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loff_t to = pos + len;
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if (to > isize) {
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/* only kill blocks in this write beyond EOF */
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if (pos > isize)
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isize = pos;
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xfs_vm_kill_delalloc_range(inode, isize, to);
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truncate_pagecache_range(inode, isize, to);
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}
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}
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return ret;
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}
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STATIC sector_t
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xfs_vm_bmap(
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struct address_space *mapping,
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@ -1747,8 +1537,6 @@ const struct address_space_operations xfs_address_space_operations = {
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.set_page_dirty = xfs_vm_set_page_dirty,
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.releasepage = xfs_vm_releasepage,
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.invalidatepage = xfs_vm_invalidatepage,
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.write_begin = xfs_vm_write_begin,
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.write_end = xfs_vm_write_end,
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.bmap = xfs_vm_bmap,
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.direct_IO = xfs_vm_direct_IO,
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.migratepage = buffer_migrate_page,
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@ -37,6 +37,7 @@
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#include "xfs_log.h"
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#include "xfs_icache.h"
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#include "xfs_pnfs.h"
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#include "xfs_iomap.h"
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#include <linux/dcache.h>
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#include <linux/falloc.h>
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@ -79,57 +80,27 @@ xfs_rw_ilock_demote(
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inode_unlock(VFS_I(ip));
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}
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/*
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* xfs_iozero clears the specified range supplied via the page cache (except in
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* the DAX case). Writes through the page cache will allocate blocks over holes,
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* though the callers usually map the holes first and avoid them. If a block is
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* not completely zeroed, then it will be read from disk before being partially
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* zeroed.
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*
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* In the DAX case, we can just directly write to the underlying pages. This
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* will not allocate blocks, but will avoid holes and unwritten extents and so
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* not do unnecessary work.
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*/
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int
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xfs_iozero(
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struct xfs_inode *ip, /* inode */
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loff_t pos, /* offset in file */
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size_t count) /* size of data to zero */
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static int
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xfs_dax_zero_range(
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struct inode *inode,
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loff_t pos,
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size_t count)
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{
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struct page *page;
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struct address_space *mapping;
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int status = 0;
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mapping = VFS_I(ip)->i_mapping;
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do {
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unsigned offset, bytes;
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void *fsdata;
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offset = (pos & (PAGE_SIZE -1)); /* Within page */
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bytes = PAGE_SIZE - offset;
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if (bytes > count)
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bytes = count;
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if (IS_DAX(VFS_I(ip))) {
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status = dax_zero_page_range(VFS_I(ip), pos, bytes,
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xfs_get_blocks_direct);
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if (status)
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break;
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} else {
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status = pagecache_write_begin(NULL, mapping, pos, bytes,
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AOP_FLAG_UNINTERRUPTIBLE,
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&page, &fsdata);
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if (status)
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break;
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status = dax_zero_page_range(inode, pos, bytes,
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xfs_get_blocks_direct);
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if (status)
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break;
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zero_user(page, offset, bytes);
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status = pagecache_write_end(NULL, mapping, pos, bytes,
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bytes, page, fsdata);
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WARN_ON(status <= 0); /* can't return less than zero! */
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status = 0;
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}
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pos += bytes;
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count -= bytes;
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} while (count);
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@ -137,6 +108,24 @@ xfs_iozero(
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return status;
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}
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/*
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* Clear the specified ranges to zero through either the pagecache or DAX.
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* Holes and unwritten extents will be left as-is as they already are zeroed.
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*/
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int
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xfs_iozero(
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struct xfs_inode *ip,
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loff_t pos,
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size_t count)
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{
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struct inode *inode = VFS_I(ip);
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if (IS_DAX(VFS_I(ip)))
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return xfs_dax_zero_range(inode, pos, count);
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else
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return iomap_zero_range(inode, pos, count, NULL, &xfs_iomap_ops);
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}
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int
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xfs_update_prealloc_flags(
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struct xfs_inode *ip,
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@ -841,7 +830,7 @@ xfs_file_buffered_aio_write(
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write_retry:
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trace_xfs_file_buffered_write(ip, iov_iter_count(from),
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iocb->ki_pos, 0);
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ret = generic_perform_write(file, from, iocb->ki_pos);
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ret = iomap_file_buffered_write(iocb, from, &xfs_iomap_ops);
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if (likely(ret >= 0))
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iocb->ki_pos += ret;
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@ -1553,7 +1542,7 @@ xfs_filemap_page_mkwrite(
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if (IS_DAX(inode)) {
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ret = __dax_mkwrite(vma, vmf, xfs_get_blocks_dax_fault);
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} else {
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ret = block_page_mkwrite(vma, vmf, xfs_get_blocks);
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ret = iomap_page_mkwrite(vma, vmf, &xfs_iomap_ops);
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ret = block_page_mkwrite_return(ret);
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}
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@ -967,3 +967,147 @@ xfs_bmbt_to_iomap(
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iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
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iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
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}
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static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps)
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{
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return !nimaps ||
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imap->br_startblock == HOLESTARTBLOCK ||
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imap->br_startblock == DELAYSTARTBLOCK;
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}
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static int
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xfs_file_iomap_begin(
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struct inode *inode,
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loff_t offset,
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loff_t length,
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unsigned flags,
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struct iomap *iomap)
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{
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec imap;
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xfs_fileoff_t offset_fsb, end_fsb;
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int nimaps = 1, error = 0;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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ASSERT(offset <= mp->m_super->s_maxbytes);
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if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes)
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length = mp->m_super->s_maxbytes - offset;
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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end_fsb = XFS_B_TO_FSB(mp, offset + length);
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error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
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&nimaps, XFS_BMAPI_ENTIRE);
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if (error) {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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return error;
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}
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if ((flags & IOMAP_WRITE) && imap_needs_alloc(&imap, nimaps)) {
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/*
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* We cap the maximum length we map here to MAX_WRITEBACK_PAGES
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* pages to keep the chunks of work done where somewhat symmetric
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* with the work writeback does. This is a completely arbitrary
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* number pulled out of thin air as a best guess for initial
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* testing.
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*
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* Note that the values needs to be less than 32-bits wide until
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* the lower level functions are updated.
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*/
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length = min_t(loff_t, length, 1024 * PAGE_SIZE);
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if (xfs_get_extsz_hint(ip)) {
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/*
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* xfs_iomap_write_direct() expects the shared lock. It
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* is unlocked on return.
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*/
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xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
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error = xfs_iomap_write_direct(ip, offset, length, &imap,
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nimaps);
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} else {
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error = xfs_iomap_write_delay(ip, offset, length, &imap);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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if (error)
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return error;
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trace_xfs_iomap_alloc(ip, offset, length, 0, &imap);
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xfs_bmbt_to_iomap(ip, iomap, &imap);
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} else if (nimaps) {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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trace_xfs_iomap_found(ip, offset, length, 0, &imap);
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xfs_bmbt_to_iomap(ip, iomap, &imap);
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} else {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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trace_xfs_iomap_not_found(ip, offset, length, 0, &imap);
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iomap->blkno = IOMAP_NULL_BLOCK;
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iomap->type = IOMAP_HOLE;
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iomap->offset = offset;
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iomap->length = length;
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}
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return 0;
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}
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static int
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xfs_file_iomap_end_delalloc(
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struct xfs_inode *ip,
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loff_t offset,
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loff_t length,
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ssize_t written)
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{
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struct xfs_mount *mp = ip->i_mount;
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xfs_fileoff_t start_fsb;
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xfs_fileoff_t end_fsb;
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int error = 0;
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||||
|
||||
start_fsb = XFS_B_TO_FSB(mp, offset + written);
|
||||
end_fsb = XFS_B_TO_FSB(mp, offset + length);
|
||||
|
||||
/*
|
||||
* Trim back delalloc blocks if we didn't manage to write the whole
|
||||
* range reserved.
|
||||
*
|
||||
* We don't need to care about racing delalloc as we hold i_mutex
|
||||
* across the reserve/allocate/unreserve calls. If there are delalloc
|
||||
* blocks in the range, they are ours.
|
||||
*/
|
||||
if (start_fsb < end_fsb) {
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
|
||||
end_fsb - start_fsb);
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
|
||||
if (error && !XFS_FORCED_SHUTDOWN(mp)) {
|
||||
xfs_alert(mp, "%s: unable to clean up ino %lld",
|
||||
__func__, ip->i_ino);
|
||||
return error;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
xfs_file_iomap_end(
|
||||
struct inode *inode,
|
||||
loff_t offset,
|
||||
loff_t length,
|
||||
ssize_t written,
|
||||
unsigned flags,
|
||||
struct iomap *iomap)
|
||||
{
|
||||
if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
|
||||
return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
|
||||
length, written);
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct iomap_ops xfs_iomap_ops = {
|
||||
.iomap_begin = xfs_file_iomap_begin,
|
||||
.iomap_end = xfs_file_iomap_end,
|
||||
};
|
||||
|
|
|
|||
|
|
@ -18,7 +18,8 @@
|
|||
#ifndef __XFS_IOMAP_H__
|
||||
#define __XFS_IOMAP_H__
|
||||
|
||||
struct iomap;
|
||||
#include <linux/iomap.h>
|
||||
|
||||
struct xfs_inode;
|
||||
struct xfs_bmbt_irec;
|
||||
|
||||
|
|
@ -33,4 +34,6 @@ int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t);
|
|||
void xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *,
|
||||
struct xfs_bmbt_irec *);
|
||||
|
||||
extern struct iomap_ops xfs_iomap_ops;
|
||||
|
||||
#endif /* __XFS_IOMAP_H__*/
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
#include "xfs_dir2.h"
|
||||
#include "xfs_trans_space.h"
|
||||
#include "xfs_pnfs.h"
|
||||
#include "xfs_iomap.h"
|
||||
|
||||
#include <linux/capability.h>
|
||||
#include <linux/xattr.h>
|
||||
|
|
@ -822,8 +823,8 @@ xfs_setattr_size(
|
|||
error = dax_truncate_page(inode, newsize,
|
||||
xfs_get_blocks_direct);
|
||||
} else {
|
||||
error = block_truncate_page(inode->i_mapping, newsize,
|
||||
xfs_get_blocks);
|
||||
error = iomap_truncate_page(inode, newsize,
|
||||
&did_zeroing, &xfs_iomap_ops);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -838,8 +839,8 @@ xfs_setattr_size(
|
|||
* problem. Note that this includes any block zeroing we did above;
|
||||
* otherwise those blocks may not be zeroed after a crash.
|
||||
*/
|
||||
if (newsize > ip->i_d.di_size &&
|
||||
(oldsize != ip->i_d.di_size || did_zeroing)) {
|
||||
if (did_zeroing ||
|
||||
(newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
|
||||
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
|
||||
ip->i_d.di_size, newsize);
|
||||
if (error)
|
||||
|
|
|
|||
|
|
@ -1295,6 +1295,9 @@ DEFINE_IOMAP_EVENT(xfs_map_blocks_alloc);
|
|||
DEFINE_IOMAP_EVENT(xfs_get_blocks_found);
|
||||
DEFINE_IOMAP_EVENT(xfs_get_blocks_alloc);
|
||||
DEFINE_IOMAP_EVENT(xfs_get_blocks_map_direct);
|
||||
DEFINE_IOMAP_EVENT(xfs_iomap_alloc);
|
||||
DEFINE_IOMAP_EVENT(xfs_iomap_found);
|
||||
DEFINE_IOMAP_EVENT(xfs_iomap_not_found);
|
||||
|
||||
DECLARE_EVENT_CLASS(xfs_simple_io_class,
|
||||
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count),
|
||||
|
|
|
|||
Loading…
Reference in a new issue