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GFS2: Implement iomap for block_map
This patch implements iomap for block mapping, and switches the block_map function to use it under the covers. The additional IOMAP_F_BOUNDARY iomap flag indicates when iomap has reached a "metadata boundary" and fetching the next mapping is likely to incur an additional I/O. This flag is used for setting the bh buffer boundary flag. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson
Andreas Gruenbacher
parent
5f8bd4440d
commit
3974320ca6
335
fs/gfs2/bmap.c
335
fs/gfs2/bmap.c
@ -13,6 +13,7 @@
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#include <linux/blkdev.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/crc32.h>
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#include <linux/iomap.h>
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#include "gfs2.h"
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#include "incore.h"
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@ -505,10 +506,8 @@ static inline unsigned int hptrs(struct gfs2_sbd *sdp, const unsigned int hgt)
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* Returns: errno on error
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*/
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static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
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bool zero_new, struct metapath *mp,
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const size_t maxlen, sector_t *dblock,
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unsigned *dblks)
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static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
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unsigned flags, struct metapath *mp)
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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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@ -516,36 +515,37 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
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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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const unsigned end_of_metadata = mp->mp_fheight - 1;
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int ret;
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int eob = 0;
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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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*dblock = 0;
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*dblks = 0;
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gfs2_trans_add_meta(ip->i_gl, dibh);
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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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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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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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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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@ -561,7 +561,7 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
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/* start of the second part of the function (state machine) */
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blks = *dblks + iblks;
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blks = dblks + iblks;
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i = mp->mp_aheight;
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do {
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int error;
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@ -618,32 +618,219 @@ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock,
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break;
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/* Tree complete, adding data blocks */
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case ALLOC_DATA:
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BUG_ON(n > *dblks);
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BUG_ON(n > dblks);
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BUG_ON(mp->mp_bh[end_of_metadata] == NULL);
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gfs2_trans_add_meta(ip->i_gl, mp->mp_bh[end_of_metadata]);
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*dblks = n;
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dblks = n;
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ptr = metapointer(end_of_metadata, mp);
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*dblock = bn;
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iomap->addr = bn << inode->i_blkbits;
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iomap->flags |= IOMAP_F_NEW;
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while (n-- > 0)
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*ptr++ = cpu_to_be64(bn++);
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if (zero_new) {
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ret = sb_issue_zeroout(sb, *dblock, *dblks,
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GFP_NOFS);
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if (flags & IOMAP_ZERO) {
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ret = sb_issue_zeroout(sb, iomap->addr >> inode->i_blkbits,
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dblks, GFP_NOFS);
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if (ret) {
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fs_err(sdp,
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"Failed to zero data buffers\n");
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flags &= ~IOMAP_ZERO;
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}
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}
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break;
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}
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} while ((state != ALLOC_DATA) || !(*dblock));
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} while (iomap->addr == IOMAP_NULL_ADDR);
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iomap->length = (u64)dblks << inode->i_blkbits;
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ip->i_height = mp->mp_fheight;
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gfs2_add_inode_blocks(&ip->i_inode, alloced);
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gfs2_dinode_out(ip, mp->mp_bh[0]->b_data);
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return 0;
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}
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/**
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* hole_size - figure out the size of a hole
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* @inode: The inode
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* @lblock: The logical starting block number
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* @mp: The metapath
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*
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* Returns: The hole size in bytes
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*
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*/
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static u64 hole_size(struct inode *inode, sector_t lblock, struct metapath *mp)
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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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struct metapath mp_eof;
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u64 factor = 1;
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int hgt;
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u64 holesz = 0;
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const __be64 *first, *end, *ptr;
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const struct buffer_head *bh;
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u64 lblock_stop = (i_size_read(inode) - 1) >> inode->i_blkbits;
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int zeroptrs;
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bool done = false;
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/* Get another metapath, to the very last byte */
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find_metapath(sdp, lblock_stop, &mp_eof, ip->i_height);
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for (hgt = ip->i_height - 1; hgt >= 0 && !done; hgt--) {
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bh = mp->mp_bh[hgt];
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if (bh) {
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zeroptrs = 0;
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first = metapointer(hgt, mp);
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end = (const __be64 *)(bh->b_data + bh->b_size);
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for (ptr = first; ptr < end; ptr++) {
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if (*ptr) {
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done = true;
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break;
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} else {
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zeroptrs++;
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}
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}
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} else {
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zeroptrs = sdp->sd_inptrs;
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}
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if (factor * zeroptrs >= lblock_stop - lblock + 1) {
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holesz = lblock_stop - lblock + 1;
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break;
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}
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holesz += factor * zeroptrs;
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factor *= sdp->sd_inptrs;
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if (hgt && (mp->mp_list[hgt - 1] < mp_eof.mp_list[hgt - 1]))
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(mp->mp_list[hgt - 1])++;
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}
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return holesz << inode->i_blkbits;
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}
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static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap)
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{
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struct gfs2_inode *ip = GFS2_I(inode);
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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->offset = 0;
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iomap->length = i_size_read(inode);
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iomap->type = IOMAP_MAPPED;
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iomap->flags = IOMAP_F_DATA_INLINE;
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}
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/**
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* gfs2_iomap_begin - Map blocks from an inode to disk blocks
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* @inode: The inode
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* @pos: Starting position in bytes
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* @length: Length to map, in bytes
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* @flags: iomap flags
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* @iomap: The iomap structure
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*
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* Returns: errno
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*/
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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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{
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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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struct metapath mp = { .mp_aheight = 1, };
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unsigned int factor = sdp->sd_sb.sb_bsize;
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const u64 *arr = sdp->sd_heightsize;
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__be64 *ptr;
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sector_t lblock;
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sector_t lend;
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int ret;
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int eob;
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unsigned int len;
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struct buffer_head *bh;
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u8 height;
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trace_gfs2_iomap_start(ip, pos, length, flags);
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if (!length) {
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ret = -EINVAL;
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goto out;
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}
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if ((flags & IOMAP_REPORT) && gfs2_is_stuffed(ip)) {
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gfs2_stuffed_iomap(inode, iomap);
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if (pos >= iomap->length)
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return -ENOENT;
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ret = 0;
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goto out;
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}
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lblock = pos >> inode->i_blkbits;
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lend = (pos + length + sdp->sd_sb.sb_bsize - 1) >> inode->i_blkbits;
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iomap->offset = lblock << inode->i_blkbits;
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iomap->addr = IOMAP_NULL_ADDR;
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iomap->type = IOMAP_HOLE;
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iomap->length = (u64)(lend - lblock) << inode->i_blkbits;
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iomap->flags = IOMAP_F_MERGED;
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bmap_lock(ip, 0);
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/*
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* Directory data blocks have a struct gfs2_meta_header header, so the
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* remaining size is smaller than the filesystem block size. Logical
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* block numbers for directories are in units of this remaining size!
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*/
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if (gfs2_is_dir(ip)) {
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factor = sdp->sd_jbsize;
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arr = sdp->sd_jheightsize;
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}
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ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
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if (ret)
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goto out_release;
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height = ip->i_height;
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while ((lblock + 1) * factor > arr[height])
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height++;
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find_metapath(sdp, lblock, &mp, height);
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if (height > ip->i_height || gfs2_is_stuffed(ip))
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goto do_alloc;
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ret = lookup_metapath(ip, &mp);
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if (ret < 0)
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goto out_release;
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if (mp.mp_aheight != ip->i_height)
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goto do_alloc;
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ptr = metapointer(ip->i_height - 1, &mp);
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if (*ptr == 0)
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goto do_alloc;
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iomap->type = IOMAP_MAPPED;
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iomap->addr = be64_to_cpu(*ptr) << inode->i_blkbits;
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bh = mp.mp_bh[ip->i_height - 1];
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len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, lend - lblock, &eob);
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if (eob)
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iomap->flags |= IOMAP_F_BOUNDARY;
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iomap->length = (u64)len << inode->i_blkbits;
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ret = 0;
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out_release:
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release_metapath(&mp);
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bmap_unlock(ip, 0);
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out:
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trace_gfs2_iomap_end(ip, iomap, ret);
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return ret;
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do_alloc:
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if (!(flags & IOMAP_WRITE)) {
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if (pos >= i_size_read(inode)) {
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ret = -ENOENT;
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goto out_release;
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}
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ret = 0;
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iomap->length = hole_size(inode, lblock, &mp);
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goto out_release;
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}
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ret = gfs2_iomap_alloc(inode, iomap, flags, &mp);
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goto out_release;
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}
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/**
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* gfs2_block_map - Map a block from an inode to a disk block
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* @inode: The inode
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@ -662,93 +849,43 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
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struct buffer_head *bh_map, int create)
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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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unsigned int factor = sdp->sd_sb.sb_bsize;
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const size_t maxlen = bh_map->b_size >> inode->i_blkbits;
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const u64 *arr = sdp->sd_heightsize;
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__be64 *ptr;
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u64 size;
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struct metapath mp;
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int ret;
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int eob;
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unsigned int len;
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struct buffer_head *bh;
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u8 height;
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bool zero_new = false;
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sector_t dblock = 0;
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unsigned dblks;
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struct iomap iomap;
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int ret, flags = 0;
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BUG_ON(maxlen == 0);
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memset(&mp, 0, sizeof(mp));
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bmap_lock(ip, create);
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clear_buffer_mapped(bh_map);
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clear_buffer_new(bh_map);
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clear_buffer_boundary(bh_map);
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trace_gfs2_bmap(ip, bh_map, lblock, create, 1);
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/*
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* Directory data blocks have a struct gfs2_meta_header header, so the
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* remaining size is smaller than the filesystem block size. Logical
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* block numbers for directories are in units of this remaining size!
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*/
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if (gfs2_is_dir(ip)) {
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factor = sdp->sd_jbsize;
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arr = sdp->sd_jheightsize;
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}
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ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]);
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if (ret)
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goto out;
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height = ip->i_height;
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size = (lblock + 1) * factor;
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while (size > arr[height])
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height++;
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find_metapath(sdp, lblock, &mp, height);
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mp.mp_aheight = 1;
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if (height > ip->i_height || gfs2_is_stuffed(ip))
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goto do_alloc;
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ret = lookup_metapath(ip, &mp);
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if (ret < 0)
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goto out;
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if (mp.mp_aheight != ip->i_height)
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goto do_alloc;
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ptr = metapointer(ip->i_height - 1, &mp);
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if (*ptr == 0)
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goto do_alloc;
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map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr));
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bh = mp.mp_bh[ip->i_height - 1];
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len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob);
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bh_map->b_size = (len << inode->i_blkbits);
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if (eob)
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set_buffer_boundary(bh_map);
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ret = 0;
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out:
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release_metapath(&mp);
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trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
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bmap_unlock(ip, create);
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return ret;
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do_alloc:
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/* All allocations are done here, firstly check create flag */
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if (!create) {
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BUG_ON(gfs2_is_stuffed(ip));
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ret = 0;
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goto out;
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}
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/* At this point ret is the tree depth of already allocated blocks */
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if (create)
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flags |= IOMAP_WRITE;
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if (buffer_zeronew(bh_map))
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zero_new = true;
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ret = gfs2_bmap_alloc(inode, lblock, zero_new, &mp, maxlen, &dblock,
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&dblks);
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if (ret == 0) {
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map_bh(bh_map, inode->i_sb, dblock);
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bh_map->b_size = dblks << inode->i_blkbits;
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set_buffer_new(bh_map);
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flags |= IOMAP_ZERO;
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ret = gfs2_iomap_begin(inode, (loff_t)lblock << inode->i_blkbits,
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bh_map->b_size, flags, &iomap);
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if (ret) {
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if (!create && ret == -ENOENT) {
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/* Return unmapped buffer beyond the end of file. */
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ret = 0;
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}
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goto out;
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}
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goto out;
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if (iomap.length > bh_map->b_size) {
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iomap.length = bh_map->b_size;
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iomap.flags &= ~IOMAP_F_BOUNDARY;
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}
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if (iomap.addr != IOMAP_NULL_ADDR)
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map_bh(bh_map, inode->i_sb, iomap.addr >> inode->i_blkbits);
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bh_map->b_size = iomap.length;
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if (iomap.flags & IOMAP_F_BOUNDARY)
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set_buffer_boundary(bh_map);
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if (iomap.flags & IOMAP_F_NEW)
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set_buffer_new(bh_map);
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out:
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trace_gfs2_bmap(ip, bh_map, lblock, create, ret);
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return ret;
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}
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/*
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@ -10,6 +10,8 @@
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#ifndef __BMAP_DOT_H__
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#define __BMAP_DOT_H__
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#include <linux/iomap.h>
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#include "inode.h"
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|
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struct inode;
|
||||
@ -47,6 +49,8 @@ static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
|
||||
extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
|
||||
extern int gfs2_block_map(struct inode *inode, sector_t lblock,
|
||||
struct buffer_head *bh, int create);
|
||||
extern int gfs2_iomap_begin(struct inode *inode, loff_t pos, loff_t length,
|
||||
unsigned flags, struct iomap *iomap);
|
||||
extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
|
||||
u64 *dblock, unsigned *extlen);
|
||||
extern int gfs2_setattr_size(struct inode *inode, u64 size);
|
||||
|
||||
@ -12,6 +12,7 @@
|
||||
#include <linux/gfs2_ondisk.h>
|
||||
#include <linux/writeback.h>
|
||||
#include <linux/ktime.h>
|
||||
#include <linux/iomap.h>
|
||||
#include "incore.h"
|
||||
#include "glock.h"
|
||||
#include "rgrp.h"
|
||||
@ -469,6 +470,70 @@ TRACE_EVENT(gfs2_bmap,
|
||||
__entry->errno)
|
||||
);
|
||||
|
||||
TRACE_EVENT(gfs2_iomap_start,
|
||||
|
||||
TP_PROTO(const struct gfs2_inode *ip, loff_t pos, ssize_t length,
|
||||
u16 flags),
|
||||
|
||||
TP_ARGS(ip, pos, length, flags),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__field( dev_t, dev )
|
||||
__field( u64, inum )
|
||||
__field( loff_t, pos )
|
||||
__field( ssize_t, length )
|
||||
__field( u16, flags )
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->dev = ip->i_gl->gl_name.ln_sbd->sd_vfs->s_dev;
|
||||
__entry->inum = ip->i_no_addr;
|
||||
__entry->pos = pos;
|
||||
__entry->length = length;
|
||||
__entry->flags = flags;
|
||||
),
|
||||
|
||||
TP_printk("%u,%u bmap %llu iomap start %llu/%lu flags:%08x",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev),
|
||||
(unsigned long long)__entry->inum,
|
||||
(unsigned long long)__entry->pos,
|
||||
(unsigned long)__entry->length, (u16)__entry->flags)
|
||||
);
|
||||
|
||||
TRACE_EVENT(gfs2_iomap_end,
|
||||
|
||||
TP_PROTO(const struct gfs2_inode *ip, struct iomap *iomap, int ret),
|
||||
|
||||
TP_ARGS(ip, iomap, ret),
|
||||
|
||||
TP_STRUCT__entry(
|
||||
__field( dev_t, dev )
|
||||
__field( u64, inum )
|
||||
__field( loff_t, offset )
|
||||
__field( ssize_t, length )
|
||||
__field( u16, flags )
|
||||
__field( u16, type )
|
||||
__field( int, ret )
|
||||
),
|
||||
|
||||
TP_fast_assign(
|
||||
__entry->dev = ip->i_gl->gl_name.ln_sbd->sd_vfs->s_dev;
|
||||
__entry->inum = ip->i_no_addr;
|
||||
__entry->offset = iomap->offset;
|
||||
__entry->length = iomap->length;
|
||||
__entry->flags = iomap->flags;
|
||||
__entry->type = iomap->type;
|
||||
__entry->ret = ret;
|
||||
),
|
||||
|
||||
TP_printk("%u,%u bmap %llu iomap end %llu/%lu ty:%d flags:%08x rc:%d",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev),
|
||||
(unsigned long long)__entry->inum,
|
||||
(unsigned long long)__entry->offset,
|
||||
(unsigned long)__entry->length, (u16)__entry->type,
|
||||
(u16)__entry->flags, __entry->ret)
|
||||
);
|
||||
|
||||
/* Keep track of blocks as they are allocated/freed */
|
||||
TRACE_EVENT(gfs2_block_alloc,
|
||||
|
||||
|
||||
@ -21,7 +21,8 @@ struct vm_fault;
|
||||
/*
|
||||
* Flags for all iomap mappings:
|
||||
*/
|
||||
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
|
||||
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
|
||||
#define IOMAP_F_BOUNDARY 0x02 /* mapping ends at metadata boundary */
|
||||
|
||||
/*
|
||||
* Flags that only need to be reported for IOMAP_REPORT requests:
|
||||
|
||||
Loading…
Reference in New Issue
Block a user