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gfs2: iomap buffered write support
With the traditional page-based writes, blocks are allocated separately for each page written to. With iomap writes, we can allocate a lot more blocks at once, with a fraction of the allocation overhead for each page. Split calculating the number of blocks that can be allocated at a given position (gfs2_alloc_size) off from gfs2_iomap_alloc: that size determines the number of blocks to allocate and reserve in the journal. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher
parent
d505a96a3b
commit
64bc06bb32
@ -22,6 +22,7 @@
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#include <linux/backing-dev.h>
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#include <linux/uio.h>
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#include <trace/events/writeback.h>
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#include <linux/sched/signal.h>
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#include "gfs2.h"
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#include "incore.h"
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@ -36,10 +37,11 @@
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#include "super.h"
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#include "util.h"
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#include "glops.h"
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#include "aops.h"
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static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int len)
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void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int len)
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{
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struct buffer_head *head = page_buffers(page);
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unsigned int bsize = head->b_size;
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@ -462,7 +464,7 @@ static int gfs2_jdata_writepages(struct address_space *mapping,
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* Returns: errno
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*/
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static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
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int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
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{
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struct buffer_head *dibh;
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u64 dsize = i_size_read(&ip->i_inode);
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@ -776,7 +778,7 @@ out_uninit:
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* adjust_fs_space - Adjusts the free space available due to gfs2_grow
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* @inode: the rindex inode
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*/
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static void adjust_fs_space(struct inode *inode)
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void adjust_fs_space(struct inode *inode)
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{
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struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
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struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
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@ -822,11 +824,11 @@ out:
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* This copies the data from the page into the inode block after
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* the inode data structure itself.
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*
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* Returns: errno
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* Returns: copied bytes or errno
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*/
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static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
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loff_t pos, unsigned copied,
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struct page *page)
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int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
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loff_t pos, unsigned copied,
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struct page *page)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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u64 to = pos + copied;
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@ -865,7 +867,7 @@ static int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
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* The main write_end function for GFS2. We just put our locking around the VFS
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* provided functions.
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*
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* Returns: errno
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* Returns: copied bytes or errno
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*/
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static int gfs2_write_end(struct file *file, struct address_space *mapping,
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19
fs/gfs2/aops.h
Normal file
19
fs/gfs2/aops.h
Normal file
@ -0,0 +1,19 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2018 Red Hat, Inc. All rights reserved.
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*/
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#ifndef __AOPS_DOT_H__
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#define __AOPS_DOT_H__
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#include "incore.h"
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extern int stuffed_readpage(struct gfs2_inode *ip, struct page *page);
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extern int gfs2_stuffed_write_end(struct inode *inode, struct buffer_head *dibh,
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loff_t pos, unsigned copied,
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struct page *page);
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extern void adjust_fs_space(struct inode *inode);
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extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int len);
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#endif /* __AOPS_DOT_H__ */
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298
fs/gfs2/bmap.c
298
fs/gfs2/bmap.c
@ -28,6 +28,7 @@
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#include "trans.h"
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#include "dir.h"
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#include "util.h"
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#include "aops.h"
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#include "trace_gfs2.h"
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/* This doesn't need to be that large as max 64 bit pointers in a 4k
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@ -41,6 +42,8 @@ struct metapath {
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int mp_aheight; /* actual height (lookup height) */
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};
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static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length);
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/**
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* gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
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* @ip: the inode
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@ -389,7 +392,7 @@ static int fillup_metapath(struct gfs2_inode *ip, struct metapath *mp, int h)
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return mp->mp_aheight - x - 1;
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}
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static inline void release_metapath(struct metapath *mp)
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static void release_metapath(struct metapath *mp)
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{
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int i;
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@ -397,6 +400,7 @@ static inline void release_metapath(struct metapath *mp)
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if (mp->mp_bh[i] == NULL)
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break;
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brelse(mp->mp_bh[i]);
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mp->mp_bh[i] = NULL;
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}
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}
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@ -609,11 +613,13 @@ enum alloc_state {
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* ii) Indirect blocks to fill in lower part of the metadata tree
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* iii) Data blocks
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*
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* The function is in two parts. The first part works out the total
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* number of blocks which we need. The second part does the actual
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* allocation asking for an extent at a time (if enough contiguous free
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* blocks are available, there will only be one request per bmap call)
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* and uses the state machine to initialise the blocks in order.
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* This function is called after gfs2_iomap_get, which works out the
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* total number of blocks which we need via gfs2_alloc_size.
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*
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* We then do the actual allocation asking for an extent at a time (if
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* enough contiguous free blocks are available, there will only be one
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* allocation request per call) and uses the state machine to initialise
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* the blocks in order.
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*
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* Right now, this function will allocate at most one indirect block
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* worth of data -- with a default block size of 4K, that's slightly
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@ -633,39 +639,26 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
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struct buffer_head *dibh = mp->mp_bh[0];
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u64 bn;
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unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0;
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unsigned dblks = 0;
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unsigned ptrs_per_blk;
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size_t dblks = iomap->length >> inode->i_blkbits;
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const unsigned end_of_metadata = mp->mp_fheight - 1;
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int ret;
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enum alloc_state state;
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__be64 *ptr;
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__be64 zero_bn = 0;
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size_t maxlen = iomap->length >> inode->i_blkbits;
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BUG_ON(mp->mp_aheight < 1);
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BUG_ON(dibh == NULL);
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BUG_ON(dblks < 1);
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gfs2_trans_add_meta(ip->i_gl, dibh);
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down_write(&ip->i_rw_mutex);
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if (mp->mp_fheight == mp->mp_aheight) {
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struct buffer_head *bh;
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int eob;
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/* Bottom indirect block exists, find unalloced extent size */
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ptr = metapointer(end_of_metadata, mp);
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bh = mp->mp_bh[end_of_metadata];
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dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr,
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maxlen, &eob);
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BUG_ON(dblks < 1);
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/* Bottom indirect block exists */
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state = ALLOC_DATA;
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} else {
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/* Need to allocate indirect blocks */
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ptrs_per_blk = mp->mp_fheight > 1 ? sdp->sd_inptrs :
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sdp->sd_diptrs;
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dblks = min(maxlen, (size_t)(ptrs_per_blk -
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mp->mp_list[end_of_metadata]));
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if (mp->mp_fheight == ip->i_height) {
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/* Writing into existing tree, extend tree down */
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iblks = mp->mp_fheight - mp->mp_aheight;
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@ -762,6 +755,50 @@ out:
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#define IOMAP_F_GFS2_BOUNDARY IOMAP_F_PRIVATE
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/**
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* gfs2_alloc_size - Compute the maximum allocation size
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* @inode: The inode
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* @mp: The metapath
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* @size: Requested size in blocks
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*
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* Compute the maximum size of the next allocation at @mp.
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*
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* Returns: size in blocks
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*/
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static u64 gfs2_alloc_size(struct inode *inode, struct metapath *mp, u64 size)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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const __be64 *first, *ptr, *end;
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/*
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* For writes to stuffed files, this function is called twice via
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* gfs2_iomap_get, before and after unstuffing. The size we return the
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* first time needs to be large enough to get the reservation and
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* allocation sizes right. The size we return the second time must
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* be exact or else gfs2_iomap_alloc won't do the right thing.
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*/
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if (gfs2_is_stuffed(ip) || mp->mp_fheight != mp->mp_aheight) {
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unsigned int maxsize = mp->mp_fheight > 1 ?
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sdp->sd_inptrs : sdp->sd_diptrs;
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maxsize -= mp->mp_list[mp->mp_fheight - 1];
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if (size > maxsize)
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size = maxsize;
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return size;
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}
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first = metapointer(ip->i_height - 1, mp);
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end = metaend(ip->i_height - 1, mp);
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if (end - first > size)
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end = first + size;
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for (ptr = first; ptr < end; ptr++) {
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if (*ptr)
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break;
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}
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return ptr - first;
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}
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/**
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* gfs2_iomap_get - Map blocks from an inode to disk blocks
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* @inode: The inode
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@ -797,6 +834,7 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
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ret = gfs2_meta_inode_buffer(ip, &dibh);
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if (ret)
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goto unlock;
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iomap->private = dibh;
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if (gfs2_is_stuffed(ip)) {
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if (flags & IOMAP_WRITE) {
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@ -822,6 +860,7 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
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iomap->addr = (ip->i_no_addr << inode->i_blkbits) +
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sizeof(struct gfs2_dinode);
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iomap->type = IOMAP_INLINE;
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iomap->inline_data = dibh->b_data + sizeof(struct gfs2_dinode);
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goto out;
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}
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@ -867,7 +906,7 @@ out:
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iomap->bdev = inode->i_sb->s_bdev;
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unlock:
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up_read(&ip->i_rw_mutex);
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if (dibh)
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if (ret && dibh)
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brelse(dibh);
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return ret;
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@ -881,13 +920,168 @@ do_alloc:
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ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
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else
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iomap->length = size - pos;
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} else if (!(flags & IOMAP_WRITE)) {
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} else if (flags & IOMAP_WRITE) {
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u64 alloc_size;
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len = gfs2_alloc_size(inode, mp, len);
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alloc_size = len << inode->i_blkbits;
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if (alloc_size < iomap->length)
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iomap->length = alloc_size;
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} else {
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if (pos < size && height == ip->i_height)
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ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
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}
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goto out;
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}
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static int gfs2_write_lock(struct inode *inode)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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int error;
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gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
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error = gfs2_glock_nq(&ip->i_gh);
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if (error)
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goto out_uninit;
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if (&ip->i_inode == sdp->sd_rindex) {
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struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
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error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE,
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GL_NOCACHE, &m_ip->i_gh);
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if (error)
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goto out_unlock;
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}
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return 0;
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out_unlock:
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gfs2_glock_dq(&ip->i_gh);
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out_uninit:
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gfs2_holder_uninit(&ip->i_gh);
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return error;
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}
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static void gfs2_write_unlock(struct inode *inode)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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if (&ip->i_inode == sdp->sd_rindex) {
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struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
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gfs2_glock_dq_uninit(&m_ip->i_gh);
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}
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gfs2_glock_dq_uninit(&ip->i_gh);
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}
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static void gfs2_iomap_journaled_page_done(struct inode *inode, loff_t pos,
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unsigned copied, struct page *page,
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struct iomap *iomap)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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gfs2_page_add_databufs(ip, page, offset_in_page(pos), copied);
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}
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static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos,
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loff_t length, unsigned flags,
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struct iomap *iomap)
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{
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struct metapath mp = { .mp_aheight = 1, };
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
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bool unstuff, alloc_required;
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int ret;
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ret = gfs2_write_lock(inode);
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if (ret)
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return ret;
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unstuff = gfs2_is_stuffed(ip) &&
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pos + length > gfs2_max_stuffed_size(ip);
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ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
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if (ret)
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goto out_release;
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alloc_required = unstuff || iomap->type == IOMAP_HOLE;
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if (alloc_required || gfs2_is_jdata(ip))
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gfs2_write_calc_reserv(ip, iomap->length, &data_blocks,
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&ind_blocks);
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if (alloc_required) {
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struct gfs2_alloc_parms ap = {
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.target = data_blocks + ind_blocks
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};
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ret = gfs2_quota_lock_check(ip, &ap);
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if (ret)
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goto out_release;
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ret = gfs2_inplace_reserve(ip, &ap);
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if (ret)
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goto out_qunlock;
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}
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rblocks = RES_DINODE + ind_blocks;
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if (gfs2_is_jdata(ip))
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rblocks += data_blocks;
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if (ind_blocks || data_blocks)
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rblocks += RES_STATFS + RES_QUOTA;
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if (inode == sdp->sd_rindex)
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rblocks += 2 * RES_STATFS;
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if (alloc_required)
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rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
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ret = gfs2_trans_begin(sdp, rblocks, iomap->length >> inode->i_blkbits);
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if (ret)
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goto out_trans_fail;
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if (unstuff) {
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ret = gfs2_unstuff_dinode(ip, NULL);
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if (ret)
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goto out_trans_end;
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release_metapath(&mp);
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brelse(iomap->private);
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iomap->private = NULL;
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ret = gfs2_iomap_get(inode, iomap->offset, iomap->length,
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flags, iomap, &mp);
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if (ret)
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goto out_trans_end;
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}
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if (iomap->type == IOMAP_HOLE) {
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ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
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if (ret) {
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gfs2_trans_end(sdp);
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gfs2_inplace_release(ip);
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punch_hole(ip, iomap->offset, iomap->length);
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goto out_qunlock;
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}
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}
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release_metapath(&mp);
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if (gfs2_is_jdata(ip))
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iomap->page_done = gfs2_iomap_journaled_page_done;
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return 0;
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out_trans_end:
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gfs2_trans_end(sdp);
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out_trans_fail:
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if (alloc_required)
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gfs2_inplace_release(ip);
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out_qunlock:
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if (alloc_required)
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gfs2_quota_unlock(ip);
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out_release:
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if (iomap->private)
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brelse(iomap->private);
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release_metapath(&mp);
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gfs2_write_unlock(inode);
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return ret;
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}
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static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
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unsigned flags, struct iomap *iomap)
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{
|
||||
@ -897,10 +1091,7 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
|
||||
|
||||
trace_gfs2_iomap_start(ip, pos, length, flags);
|
||||
if (flags & IOMAP_WRITE) {
|
||||
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
|
||||
if (!ret && iomap->type == IOMAP_HOLE)
|
||||
ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
|
||||
release_metapath(&mp);
|
||||
ret = gfs2_iomap_begin_write(inode, pos, length, flags, iomap);
|
||||
} else {
|
||||
ret = gfs2_iomap_get(inode, pos, length, flags, iomap, &mp);
|
||||
release_metapath(&mp);
|
||||
@ -909,8 +1100,59 @@ static int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
|
||||
ssize_t written, unsigned flags, struct iomap *iomap)
|
||||
{
|
||||
struct gfs2_inode *ip = GFS2_I(inode);
|
||||
struct gfs2_sbd *sdp = GFS2_SB(inode);
|
||||
struct gfs2_trans *tr = current->journal_info;
|
||||
struct buffer_head *dibh = iomap->private;
|
||||
|
||||
if (!(flags & IOMAP_WRITE))
|
||||
goto out;
|
||||
|
||||
if (iomap->type != IOMAP_INLINE) {
|
||||
gfs2_ordered_add_inode(ip);
|
||||
|
||||
if (tr->tr_num_buf_new)
|
||||
__mark_inode_dirty(inode, I_DIRTY_DATASYNC);
|
||||
else
|
||||
gfs2_trans_add_meta(ip->i_gl, dibh);
|
||||
}
|
||||
|
||||
if (inode == sdp->sd_rindex) {
|
||||
adjust_fs_space(inode);
|
||||
sdp->sd_rindex_uptodate = 0;
|
||||
}
|
||||
|
||||
gfs2_trans_end(sdp);
|
||||
gfs2_inplace_release(ip);
|
||||
|
||||
if (length != written && (iomap->flags & IOMAP_F_NEW)) {
|
||||
/* Deallocate blocks that were just allocated. */
|
||||
loff_t blockmask = i_blocksize(inode) - 1;
|
||||
loff_t end = (pos + length) & ~blockmask;
|
||||
|
||||
pos = (pos + written + blockmask) & ~blockmask;
|
||||
if (pos < end) {
|
||||
truncate_pagecache_range(inode, pos, end - 1);
|
||||
punch_hole(ip, pos, end - pos);
|
||||
}
|
||||
}
|
||||
|
||||
if (ip->i_qadata && ip->i_qadata->qa_qd_num)
|
||||
gfs2_quota_unlock(ip);
|
||||
gfs2_write_unlock(inode);
|
||||
|
||||
out:
|
||||
if (dibh)
|
||||
brelse(dibh);
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct iomap_ops gfs2_iomap_ops = {
|
||||
.iomap_begin = gfs2_iomap_begin,
|
||||
.iomap_end = gfs2_iomap_end,
|
||||
};
|
||||
|
||||
/**
|
||||
|
||||
@ -26,10 +26,12 @@
|
||||
#include <linux/dlm.h>
|
||||
#include <linux/dlm_plock.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/backing-dev.h>
|
||||
|
||||
#include "gfs2.h"
|
||||
#include "incore.h"
|
||||
#include "bmap.h"
|
||||
#include "aops.h"
|
||||
#include "dir.h"
|
||||
#include "glock.h"
|
||||
#include "glops.h"
|
||||
@ -691,9 +693,7 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
|
||||
/**
|
||||
* gfs2_file_write_iter - Perform a write to a file
|
||||
* @iocb: The io context
|
||||
* @iov: The data to write
|
||||
* @nr_segs: Number of @iov segments
|
||||
* @pos: The file position
|
||||
* @from: The data to write
|
||||
*
|
||||
* We have to do a lock/unlock here to refresh the inode size for
|
||||
* O_APPEND writes, otherwise we can land up writing at the wrong
|
||||
@ -705,8 +705,9 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
|
||||
static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
struct gfs2_inode *ip = GFS2_I(file_inode(file));
|
||||
int ret;
|
||||
struct inode *inode = file_inode(file);
|
||||
struct gfs2_inode *ip = GFS2_I(inode);
|
||||
ssize_t ret;
|
||||
|
||||
ret = gfs2_rsqa_alloc(ip);
|
||||
if (ret)
|
||||
@ -723,7 +724,38 @@ static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
||||
gfs2_glock_dq_uninit(&gh);
|
||||
}
|
||||
|
||||
return generic_file_write_iter(iocb, from);
|
||||
if (iocb->ki_flags & IOCB_DIRECT)
|
||||
return generic_file_write_iter(iocb, from);
|
||||
|
||||
inode_lock(inode);
|
||||
ret = generic_write_checks(iocb, from);
|
||||
if (ret <= 0)
|
||||
goto out;
|
||||
|
||||
/* We can write back this queue in page reclaim */
|
||||
current->backing_dev_info = inode_to_bdi(inode);
|
||||
|
||||
ret = file_remove_privs(file);
|
||||
if (ret)
|
||||
goto out2;
|
||||
|
||||
ret = file_update_time(file);
|
||||
if (ret)
|
||||
goto out2;
|
||||
|
||||
ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
|
||||
|
||||
out2:
|
||||
current->backing_dev_info = NULL;
|
||||
out:
|
||||
inode_unlock(inode);
|
||||
if (likely(ret > 0)) {
|
||||
iocb->ki_pos += ret;
|
||||
|
||||
/* Handle various SYNC-type writes */
|
||||
ret = generic_write_sync(iocb, ret);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user