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![Yue Hu](/assets/img/avatar_default.png)
linux/fs.h has a wrapper for this operation. Signed-off-by: Yue Hu <huyue2@coolpad.com> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Link: https://lore.kernel.org/r/20230306075527.1338-1-zbestahu@gmail.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
439 lines
11 KiB
C
439 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Copyright (C) 2021, Alibaba Cloud
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*/
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#include "internal.h"
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#include <linux/prefetch.h>
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#include <linux/sched/mm.h>
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#include <linux/dax.h>
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#include <trace/events/erofs.h>
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void erofs_unmap_metabuf(struct erofs_buf *buf)
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{
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if (buf->kmap_type == EROFS_KMAP)
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kunmap_local(buf->base);
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buf->base = NULL;
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buf->kmap_type = EROFS_NO_KMAP;
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}
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void erofs_put_metabuf(struct erofs_buf *buf)
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{
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if (!buf->page)
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return;
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erofs_unmap_metabuf(buf);
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put_page(buf->page);
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buf->page = NULL;
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}
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void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
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erofs_blk_t blkaddr, enum erofs_kmap_type type)
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{
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struct address_space *const mapping = inode->i_mapping;
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erofs_off_t offset = blknr_to_addr(blkaddr);
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pgoff_t index = offset >> PAGE_SHIFT;
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struct page *page = buf->page;
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struct folio *folio;
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unsigned int nofs_flag;
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if (!page || page->index != index) {
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erofs_put_metabuf(buf);
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nofs_flag = memalloc_nofs_save();
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folio = read_cache_folio(mapping, index, NULL, NULL);
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memalloc_nofs_restore(nofs_flag);
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if (IS_ERR(folio))
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return folio;
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/* should already be PageUptodate, no need to lock page */
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page = folio_file_page(folio, index);
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buf->page = page;
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}
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if (buf->kmap_type == EROFS_NO_KMAP) {
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if (type == EROFS_KMAP)
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buf->base = kmap_local_page(page);
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buf->kmap_type = type;
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} else if (buf->kmap_type != type) {
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DBG_BUGON(1);
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return ERR_PTR(-EFAULT);
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}
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if (type == EROFS_NO_KMAP)
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return NULL;
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return buf->base + (offset & ~PAGE_MASK);
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}
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void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
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erofs_blk_t blkaddr, enum erofs_kmap_type type)
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{
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if (erofs_is_fscache_mode(sb))
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return erofs_bread(buf, EROFS_SB(sb)->s_fscache->inode,
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blkaddr, type);
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return erofs_bread(buf, sb->s_bdev->bd_inode, blkaddr, type);
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}
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static int erofs_map_blocks_flatmode(struct inode *inode,
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struct erofs_map_blocks *map)
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{
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erofs_blk_t nblocks, lastblk;
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u64 offset = map->m_la;
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struct erofs_inode *vi = EROFS_I(inode);
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bool tailendpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
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nblocks = DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
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lastblk = nblocks - tailendpacking;
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/* there is no hole in flatmode */
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map->m_flags = EROFS_MAP_MAPPED;
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if (offset < blknr_to_addr(lastblk)) {
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map->m_pa = blknr_to_addr(vi->raw_blkaddr) + map->m_la;
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map->m_plen = blknr_to_addr(lastblk) - offset;
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} else if (tailendpacking) {
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map->m_pa = erofs_iloc(inode) + vi->inode_isize +
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vi->xattr_isize + erofs_blkoff(offset);
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map->m_plen = inode->i_size - offset;
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/* inline data should be located in the same meta block */
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if (erofs_blkoff(map->m_pa) + map->m_plen > EROFS_BLKSIZ) {
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erofs_err(inode->i_sb,
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"inline data cross block boundary @ nid %llu",
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vi->nid);
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DBG_BUGON(1);
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return -EFSCORRUPTED;
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}
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map->m_flags |= EROFS_MAP_META;
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} else {
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erofs_err(inode->i_sb,
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"internal error @ nid: %llu (size %llu), m_la 0x%llx",
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vi->nid, inode->i_size, map->m_la);
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DBG_BUGON(1);
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return -EIO;
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}
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return 0;
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}
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int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map)
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{
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struct super_block *sb = inode->i_sb;
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struct erofs_inode *vi = EROFS_I(inode);
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struct erofs_inode_chunk_index *idx;
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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u64 chunknr;
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unsigned int unit;
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erofs_off_t pos;
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void *kaddr;
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int err = 0;
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trace_erofs_map_blocks_enter(inode, map, 0);
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map->m_deviceid = 0;
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if (map->m_la >= inode->i_size) {
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/* leave out-of-bound access unmapped */
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map->m_flags = 0;
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map->m_plen = 0;
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goto out;
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}
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if (vi->datalayout != EROFS_INODE_CHUNK_BASED) {
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err = erofs_map_blocks_flatmode(inode, map);
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goto out;
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}
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if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)
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unit = sizeof(*idx); /* chunk index */
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else
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unit = EROFS_BLOCK_MAP_ENTRY_SIZE; /* block map */
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chunknr = map->m_la >> vi->chunkbits;
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pos = ALIGN(erofs_iloc(inode) + vi->inode_isize +
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vi->xattr_isize, unit) + unit * chunknr;
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kaddr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos), EROFS_KMAP);
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if (IS_ERR(kaddr)) {
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err = PTR_ERR(kaddr);
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goto out;
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}
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map->m_la = chunknr << vi->chunkbits;
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map->m_plen = min_t(erofs_off_t, 1UL << vi->chunkbits,
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roundup(inode->i_size - map->m_la, EROFS_BLKSIZ));
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/* handle block map */
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if (!(vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)) {
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__le32 *blkaddr = kaddr + erofs_blkoff(pos);
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if (le32_to_cpu(*blkaddr) == EROFS_NULL_ADDR) {
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map->m_flags = 0;
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} else {
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map->m_pa = blknr_to_addr(le32_to_cpu(*blkaddr));
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map->m_flags = EROFS_MAP_MAPPED;
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}
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goto out_unlock;
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}
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/* parse chunk indexes */
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idx = kaddr + erofs_blkoff(pos);
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switch (le32_to_cpu(idx->blkaddr)) {
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case EROFS_NULL_ADDR:
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map->m_flags = 0;
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break;
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default:
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map->m_deviceid = le16_to_cpu(idx->device_id) &
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EROFS_SB(sb)->device_id_mask;
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map->m_pa = blknr_to_addr(le32_to_cpu(idx->blkaddr));
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map->m_flags = EROFS_MAP_MAPPED;
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break;
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}
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out_unlock:
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erofs_put_metabuf(&buf);
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out:
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if (!err)
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map->m_llen = map->m_plen;
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trace_erofs_map_blocks_exit(inode, map, 0, err);
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return err;
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}
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int erofs_map_dev(struct super_block *sb, struct erofs_map_dev *map)
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{
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struct erofs_dev_context *devs = EROFS_SB(sb)->devs;
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struct erofs_device_info *dif;
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int id;
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/* primary device by default */
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map->m_bdev = sb->s_bdev;
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map->m_daxdev = EROFS_SB(sb)->dax_dev;
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map->m_dax_part_off = EROFS_SB(sb)->dax_part_off;
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map->m_fscache = EROFS_SB(sb)->s_fscache;
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if (map->m_deviceid) {
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down_read(&devs->rwsem);
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dif = idr_find(&devs->tree, map->m_deviceid - 1);
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if (!dif) {
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up_read(&devs->rwsem);
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return -ENODEV;
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}
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map->m_bdev = dif->bdev;
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map->m_daxdev = dif->dax_dev;
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map->m_dax_part_off = dif->dax_part_off;
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map->m_fscache = dif->fscache;
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up_read(&devs->rwsem);
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} else if (devs->extra_devices) {
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down_read(&devs->rwsem);
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idr_for_each_entry(&devs->tree, dif, id) {
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erofs_off_t startoff, length;
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if (!dif->mapped_blkaddr)
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continue;
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startoff = blknr_to_addr(dif->mapped_blkaddr);
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length = blknr_to_addr(dif->blocks);
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if (map->m_pa >= startoff &&
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map->m_pa < startoff + length) {
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map->m_pa -= startoff;
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map->m_bdev = dif->bdev;
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map->m_daxdev = dif->dax_dev;
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map->m_dax_part_off = dif->dax_part_off;
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map->m_fscache = dif->fscache;
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break;
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}
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}
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up_read(&devs->rwsem);
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}
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return 0;
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}
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static int erofs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
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unsigned int flags, struct iomap *iomap, struct iomap *srcmap)
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{
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int ret;
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struct erofs_map_blocks map;
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struct erofs_map_dev mdev;
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map.m_la = offset;
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map.m_llen = length;
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ret = erofs_map_blocks(inode, &map);
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if (ret < 0)
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return ret;
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mdev = (struct erofs_map_dev) {
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.m_deviceid = map.m_deviceid,
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.m_pa = map.m_pa,
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};
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ret = erofs_map_dev(inode->i_sb, &mdev);
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if (ret)
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return ret;
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iomap->offset = map.m_la;
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if (flags & IOMAP_DAX)
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iomap->dax_dev = mdev.m_daxdev;
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else
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iomap->bdev = mdev.m_bdev;
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iomap->length = map.m_llen;
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iomap->flags = 0;
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iomap->private = NULL;
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if (!(map.m_flags & EROFS_MAP_MAPPED)) {
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iomap->type = IOMAP_HOLE;
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iomap->addr = IOMAP_NULL_ADDR;
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if (!iomap->length)
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iomap->length = length;
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return 0;
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}
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if (map.m_flags & EROFS_MAP_META) {
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void *ptr;
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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iomap->type = IOMAP_INLINE;
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ptr = erofs_read_metabuf(&buf, inode->i_sb,
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erofs_blknr(mdev.m_pa), EROFS_KMAP);
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if (IS_ERR(ptr))
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return PTR_ERR(ptr);
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iomap->inline_data = ptr + erofs_blkoff(mdev.m_pa);
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iomap->private = buf.base;
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} else {
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iomap->type = IOMAP_MAPPED;
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iomap->addr = mdev.m_pa;
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if (flags & IOMAP_DAX)
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iomap->addr += mdev.m_dax_part_off;
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}
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return 0;
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}
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static int erofs_iomap_end(struct inode *inode, loff_t pos, loff_t length,
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ssize_t written, unsigned int flags, struct iomap *iomap)
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{
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void *ptr = iomap->private;
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if (ptr) {
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struct erofs_buf buf = {
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.page = kmap_to_page(ptr),
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.base = ptr,
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.kmap_type = EROFS_KMAP,
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};
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DBG_BUGON(iomap->type != IOMAP_INLINE);
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erofs_put_metabuf(&buf);
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} else {
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DBG_BUGON(iomap->type == IOMAP_INLINE);
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}
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return written;
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}
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static const struct iomap_ops erofs_iomap_ops = {
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.iomap_begin = erofs_iomap_begin,
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.iomap_end = erofs_iomap_end,
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};
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int erofs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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u64 start, u64 len)
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{
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if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout)) {
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#ifdef CONFIG_EROFS_FS_ZIP
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return iomap_fiemap(inode, fieinfo, start, len,
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&z_erofs_iomap_report_ops);
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#else
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return -EOPNOTSUPP;
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#endif
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}
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return iomap_fiemap(inode, fieinfo, start, len, &erofs_iomap_ops);
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}
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/*
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* since we dont have write or truncate flows, so no inode
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* locking needs to be held at the moment.
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*/
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static int erofs_read_folio(struct file *file, struct folio *folio)
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{
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return iomap_read_folio(folio, &erofs_iomap_ops);
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}
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static void erofs_readahead(struct readahead_control *rac)
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{
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return iomap_readahead(rac, &erofs_iomap_ops);
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}
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static sector_t erofs_bmap(struct address_space *mapping, sector_t block)
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{
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return iomap_bmap(mapping, block, &erofs_iomap_ops);
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}
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static ssize_t erofs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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/* no need taking (shared) inode lock since it's a ro filesystem */
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if (!iov_iter_count(to))
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return 0;
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#ifdef CONFIG_FS_DAX
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if (IS_DAX(inode))
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return dax_iomap_rw(iocb, to, &erofs_iomap_ops);
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#endif
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if (iocb->ki_flags & IOCB_DIRECT) {
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struct block_device *bdev = inode->i_sb->s_bdev;
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unsigned int blksize_mask;
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if (bdev)
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blksize_mask = bdev_logical_block_size(bdev) - 1;
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else
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blksize_mask = i_blocksize(inode) - 1;
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if ((iocb->ki_pos | iov_iter_count(to) |
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iov_iter_alignment(to)) & blksize_mask)
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return -EINVAL;
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return iomap_dio_rw(iocb, to, &erofs_iomap_ops,
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NULL, 0, NULL, 0);
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}
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return filemap_read(iocb, to, 0);
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}
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/* for uncompressed (aligned) files and raw access for other files */
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const struct address_space_operations erofs_raw_access_aops = {
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.read_folio = erofs_read_folio,
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.readahead = erofs_readahead,
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.bmap = erofs_bmap,
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.direct_IO = noop_direct_IO,
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.release_folio = iomap_release_folio,
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.invalidate_folio = iomap_invalidate_folio,
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};
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#ifdef CONFIG_FS_DAX
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static vm_fault_t erofs_dax_huge_fault(struct vm_fault *vmf,
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enum page_entry_size pe_size)
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{
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return dax_iomap_fault(vmf, pe_size, NULL, NULL, &erofs_iomap_ops);
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}
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static vm_fault_t erofs_dax_fault(struct vm_fault *vmf)
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{
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return erofs_dax_huge_fault(vmf, PE_SIZE_PTE);
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}
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static const struct vm_operations_struct erofs_dax_vm_ops = {
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.fault = erofs_dax_fault,
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.huge_fault = erofs_dax_huge_fault,
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};
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static int erofs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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if (!IS_DAX(file_inode(file)))
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return generic_file_readonly_mmap(file, vma);
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if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
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return -EINVAL;
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vma->vm_ops = &erofs_dax_vm_ops;
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vm_flags_set(vma, VM_HUGEPAGE);
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return 0;
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}
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#else
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#define erofs_file_mmap generic_file_readonly_mmap
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#endif
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const struct file_operations erofs_file_fops = {
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.llseek = generic_file_llseek,
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.read_iter = erofs_file_read_iter,
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.mmap = erofs_file_mmap,
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.splice_read = generic_file_splice_read,
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};
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