mirror of
https://github.com/FEX-Emu/linux.git
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f568849eda
Pull core block IO changes from Jens Axboe: "The major piece in here is the immutable bio_ve series from Kent, the rest is fairly minor. It was supposed to go in last round, but various issues pushed it to this release instead. The pull request contains: - Various smaller blk-mq fixes from different folks. Nothing major here, just minor fixes and cleanups. - Fix for a memory leak in the error path in the block ioctl code from Christian Engelmayer. - Header export fix from CaiZhiyong. - Finally the immutable biovec changes from Kent Overstreet. This enables some nice future work on making arbitrarily sized bios possible, and splitting more efficient. Related fixes to immutable bio_vecs: - dm-cache immutable fixup from Mike Snitzer. - btrfs immutable fixup from Muthu Kumar. - bio-integrity fix from Nic Bellinger, which is also going to stable" * 'for-3.14/core' of git://git.kernel.dk/linux-block: (44 commits) xtensa: fixup simdisk driver to work with immutable bio_vecs block/blk-mq-cpu.c: use hotcpu_notifier() blk-mq: for_each_* macro correctness block: Fix memory leak in rw_copy_check_uvector() handling bio-integrity: Fix bio_integrity_verify segment start bug block: remove unrelated header files and export symbol blk-mq: uses page->list incorrectly blk-mq: use __smp_call_function_single directly btrfs: fix missing increment of bi_remaining Revert "block: Warn and free bio if bi_end_io is not set" block: Warn and free bio if bi_end_io is not set blk-mq: fix initializing request's start time block: blk-mq: don't export blk_mq_free_queue() block: blk-mq: make blk_sync_queue support mq block: blk-mq: support draining mq queue dm cache: increment bi_remaining when bi_end_io is restored block: fixup for generic bio chaining block: Really silence spurious compiler warnings block: Silence spurious compiler warnings block: Kill bio_pair_split() ...
1084 lines
26 KiB
C
1084 lines
26 KiB
C
/*
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* fs/f2fs/data.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/buffer_head.h>
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#include <linux/mpage.h>
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#include <linux/aio.h>
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#include <linux/writeback.h>
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#include <linux/backing-dev.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/prefetch.h>
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#include "f2fs.h"
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#include "node.h"
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#include "segment.h"
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#include <trace/events/f2fs.h>
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static void f2fs_read_end_io(struct bio *bio, int err)
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{
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struct bio_vec *bvec;
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int i;
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bio_for_each_segment_all(bvec, bio, i) {
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struct page *page = bvec->bv_page;
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if (!err) {
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SetPageUptodate(page);
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} else {
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ClearPageUptodate(page);
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SetPageError(page);
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}
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unlock_page(page);
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}
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bio_put(bio);
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}
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static void f2fs_write_end_io(struct bio *bio, int err)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(bio->bi_io_vec->bv_page->mapping->host->i_sb);
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struct bio_vec *bvec;
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int i;
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bio_for_each_segment_all(bvec, bio, i) {
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struct page *page = bvec->bv_page;
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if (unlikely(err)) {
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SetPageError(page);
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set_bit(AS_EIO, &page->mapping->flags);
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set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
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sbi->sb->s_flags |= MS_RDONLY;
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}
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end_page_writeback(page);
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dec_page_count(sbi, F2FS_WRITEBACK);
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}
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if (bio->bi_private)
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complete(bio->bi_private);
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if (!get_pages(sbi, F2FS_WRITEBACK) &&
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!list_empty(&sbi->cp_wait.task_list))
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wake_up(&sbi->cp_wait);
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bio_put(bio);
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}
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/*
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* Low-level block read/write IO operations.
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*/
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static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
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int npages, bool is_read)
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{
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struct bio *bio;
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/* No failure on bio allocation */
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bio = bio_alloc(GFP_NOIO, npages);
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bio->bi_bdev = sbi->sb->s_bdev;
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bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
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bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
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return bio;
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}
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static void __submit_merged_bio(struct f2fs_bio_info *io)
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{
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struct f2fs_io_info *fio = &io->fio;
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int rw;
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if (!io->bio)
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return;
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rw = fio->rw;
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if (is_read_io(rw)) {
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trace_f2fs_submit_read_bio(io->sbi->sb, rw,
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fio->type, io->bio);
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submit_bio(rw, io->bio);
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} else {
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trace_f2fs_submit_write_bio(io->sbi->sb, rw,
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fio->type, io->bio);
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/*
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* META_FLUSH is only from the checkpoint procedure, and we
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* should wait this metadata bio for FS consistency.
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*/
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if (fio->type == META_FLUSH) {
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DECLARE_COMPLETION_ONSTACK(wait);
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io->bio->bi_private = &wait;
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submit_bio(rw, io->bio);
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wait_for_completion(&wait);
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} else {
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submit_bio(rw, io->bio);
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}
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}
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io->bio = NULL;
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}
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void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
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enum page_type type, int rw)
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{
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enum page_type btype = PAGE_TYPE_OF_BIO(type);
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struct f2fs_bio_info *io;
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io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
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mutex_lock(&io->io_mutex);
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/* change META to META_FLUSH in the checkpoint procedure */
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if (type >= META_FLUSH) {
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io->fio.type = META_FLUSH;
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io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
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}
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__submit_merged_bio(io);
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mutex_unlock(&io->io_mutex);
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}
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/*
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* Fill the locked page with data located in the block address.
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* Return unlocked page.
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*/
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int f2fs_submit_page_bio(struct f2fs_sb_info *sbi, struct page *page,
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block_t blk_addr, int rw)
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{
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struct bio *bio;
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trace_f2fs_submit_page_bio(page, blk_addr, rw);
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/* Allocate a new bio */
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bio = __bio_alloc(sbi, blk_addr, 1, is_read_io(rw));
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if (bio_add_page(bio, page, PAGE_CACHE_SIZE, 0) < PAGE_CACHE_SIZE) {
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bio_put(bio);
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f2fs_put_page(page, 1);
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return -EFAULT;
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}
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submit_bio(rw, bio);
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return 0;
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}
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void f2fs_submit_page_mbio(struct f2fs_sb_info *sbi, struct page *page,
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block_t blk_addr, struct f2fs_io_info *fio)
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{
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enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
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struct f2fs_bio_info *io;
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bool is_read = is_read_io(fio->rw);
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io = is_read ? &sbi->read_io : &sbi->write_io[btype];
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verify_block_addr(sbi, blk_addr);
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mutex_lock(&io->io_mutex);
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if (!is_read)
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inc_page_count(sbi, F2FS_WRITEBACK);
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if (io->bio && (io->last_block_in_bio != blk_addr - 1 ||
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io->fio.rw != fio->rw))
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__submit_merged_bio(io);
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alloc_new:
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if (io->bio == NULL) {
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int bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
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io->bio = __bio_alloc(sbi, blk_addr, bio_blocks, is_read);
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io->fio = *fio;
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}
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if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
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PAGE_CACHE_SIZE) {
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__submit_merged_bio(io);
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goto alloc_new;
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}
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io->last_block_in_bio = blk_addr;
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mutex_unlock(&io->io_mutex);
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trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
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}
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/*
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* Lock ordering for the change of data block address:
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* ->data_page
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* ->node_page
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* update block addresses in the node page
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*/
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static void __set_data_blkaddr(struct dnode_of_data *dn, block_t new_addr)
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{
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struct f2fs_node *rn;
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__le32 *addr_array;
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struct page *node_page = dn->node_page;
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unsigned int ofs_in_node = dn->ofs_in_node;
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f2fs_wait_on_page_writeback(node_page, NODE);
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rn = F2FS_NODE(node_page);
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/* Get physical address of data block */
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addr_array = blkaddr_in_node(rn);
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addr_array[ofs_in_node] = cpu_to_le32(new_addr);
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set_page_dirty(node_page);
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}
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int reserve_new_block(struct dnode_of_data *dn)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
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if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
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return -EPERM;
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if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
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return -ENOSPC;
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trace_f2fs_reserve_new_block(dn->inode, dn->nid, dn->ofs_in_node);
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__set_data_blkaddr(dn, NEW_ADDR);
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dn->data_blkaddr = NEW_ADDR;
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mark_inode_dirty(dn->inode);
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sync_inode_page(dn);
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return 0;
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}
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int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
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{
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bool need_put = dn->inode_page ? false : true;
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int err;
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/* if inode_page exists, index should be zero */
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f2fs_bug_on(!need_put && index);
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err = get_dnode_of_data(dn, index, ALLOC_NODE);
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if (err)
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return err;
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if (dn->data_blkaddr == NULL_ADDR)
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err = reserve_new_block(dn);
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if (err || need_put)
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f2fs_put_dnode(dn);
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return err;
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}
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static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
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struct buffer_head *bh_result)
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{
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struct f2fs_inode_info *fi = F2FS_I(inode);
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pgoff_t start_fofs, end_fofs;
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block_t start_blkaddr;
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if (is_inode_flag_set(fi, FI_NO_EXTENT))
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return 0;
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read_lock(&fi->ext.ext_lock);
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if (fi->ext.len == 0) {
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read_unlock(&fi->ext.ext_lock);
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return 0;
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}
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stat_inc_total_hit(inode->i_sb);
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start_fofs = fi->ext.fofs;
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end_fofs = fi->ext.fofs + fi->ext.len - 1;
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start_blkaddr = fi->ext.blk_addr;
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if (pgofs >= start_fofs && pgofs <= end_fofs) {
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unsigned int blkbits = inode->i_sb->s_blocksize_bits;
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size_t count;
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clear_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb,
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start_blkaddr + pgofs - start_fofs);
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count = end_fofs - pgofs + 1;
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if (count < (UINT_MAX >> blkbits))
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bh_result->b_size = (count << blkbits);
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else
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bh_result->b_size = UINT_MAX;
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stat_inc_read_hit(inode->i_sb);
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read_unlock(&fi->ext.ext_lock);
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return 1;
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}
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read_unlock(&fi->ext.ext_lock);
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return 0;
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}
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void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
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{
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struct f2fs_inode_info *fi = F2FS_I(dn->inode);
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pgoff_t fofs, start_fofs, end_fofs;
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block_t start_blkaddr, end_blkaddr;
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int need_update = true;
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f2fs_bug_on(blk_addr == NEW_ADDR);
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fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
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dn->ofs_in_node;
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/* Update the page address in the parent node */
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__set_data_blkaddr(dn, blk_addr);
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if (is_inode_flag_set(fi, FI_NO_EXTENT))
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return;
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write_lock(&fi->ext.ext_lock);
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start_fofs = fi->ext.fofs;
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end_fofs = fi->ext.fofs + fi->ext.len - 1;
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start_blkaddr = fi->ext.blk_addr;
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end_blkaddr = fi->ext.blk_addr + fi->ext.len - 1;
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/* Drop and initialize the matched extent */
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if (fi->ext.len == 1 && fofs == start_fofs)
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fi->ext.len = 0;
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/* Initial extent */
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if (fi->ext.len == 0) {
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if (blk_addr != NULL_ADDR) {
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fi->ext.fofs = fofs;
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fi->ext.blk_addr = blk_addr;
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fi->ext.len = 1;
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}
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goto end_update;
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}
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/* Front merge */
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if (fofs == start_fofs - 1 && blk_addr == start_blkaddr - 1) {
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fi->ext.fofs--;
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fi->ext.blk_addr--;
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fi->ext.len++;
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goto end_update;
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}
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|
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/* Back merge */
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if (fofs == end_fofs + 1 && blk_addr == end_blkaddr + 1) {
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fi->ext.len++;
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goto end_update;
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}
|
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|
|
/* Split the existing extent */
|
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if (fi->ext.len > 1 &&
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fofs >= start_fofs && fofs <= end_fofs) {
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if ((end_fofs - fofs) < (fi->ext.len >> 1)) {
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fi->ext.len = fofs - start_fofs;
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} else {
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fi->ext.fofs = fofs + 1;
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fi->ext.blk_addr = start_blkaddr +
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fofs - start_fofs + 1;
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fi->ext.len -= fofs - start_fofs + 1;
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}
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} else {
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need_update = false;
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}
|
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|
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/* Finally, if the extent is very fragmented, let's drop the cache. */
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if (fi->ext.len < F2FS_MIN_EXTENT_LEN) {
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fi->ext.len = 0;
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set_inode_flag(fi, FI_NO_EXTENT);
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need_update = true;
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}
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end_update:
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write_unlock(&fi->ext.ext_lock);
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if (need_update)
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sync_inode_page(dn);
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return;
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}
|
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|
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struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct address_space *mapping = inode->i_mapping;
|
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struct dnode_of_data dn;
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struct page *page;
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int err;
|
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|
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page = find_get_page(mapping, index);
|
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if (page && PageUptodate(page))
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return page;
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f2fs_put_page(page, 0);
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|
|
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
|
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if (err)
|
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return ERR_PTR(err);
|
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f2fs_put_dnode(&dn);
|
|
|
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if (dn.data_blkaddr == NULL_ADDR)
|
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return ERR_PTR(-ENOENT);
|
|
|
|
/* By fallocate(), there is no cached page, but with NEW_ADDR */
|
|
if (unlikely(dn.data_blkaddr == NEW_ADDR))
|
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return ERR_PTR(-EINVAL);
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
|
|
if (!page)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (PageUptodate(page)) {
|
|
unlock_page(page);
|
|
return page;
|
|
}
|
|
|
|
err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
|
|
sync ? READ_SYNC : READA);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
if (sync) {
|
|
wait_on_page_locked(page);
|
|
if (unlikely(!PageUptodate(page))) {
|
|
f2fs_put_page(page, 0);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
}
|
|
return page;
|
|
}
|
|
|
|
/*
|
|
* If it tries to access a hole, return an error.
|
|
* Because, the callers, functions in dir.c and GC, should be able to know
|
|
* whether this page exists or not.
|
|
*/
|
|
struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct dnode_of_data dn;
|
|
struct page *page;
|
|
int err;
|
|
|
|
repeat:
|
|
page = grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
|
|
if (!page)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
|
|
if (err) {
|
|
f2fs_put_page(page, 1);
|
|
return ERR_PTR(err);
|
|
}
|
|
f2fs_put_dnode(&dn);
|
|
|
|
if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
|
|
f2fs_put_page(page, 1);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
if (PageUptodate(page))
|
|
return page;
|
|
|
|
/*
|
|
* A new dentry page is allocated but not able to be written, since its
|
|
* new inode page couldn't be allocated due to -ENOSPC.
|
|
* In such the case, its blkaddr can be remained as NEW_ADDR.
|
|
* see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
|
|
*/
|
|
if (dn.data_blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
|
|
SetPageUptodate(page);
|
|
return page;
|
|
}
|
|
|
|
err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr, READ_SYNC);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
lock_page(page);
|
|
if (unlikely(!PageUptodate(page))) {
|
|
f2fs_put_page(page, 1);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
if (unlikely(page->mapping != mapping)) {
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
return page;
|
|
}
|
|
|
|
/*
|
|
* Caller ensures that this data page is never allocated.
|
|
* A new zero-filled data page is allocated in the page cache.
|
|
*
|
|
* Also, caller should grab and release a rwsem by calling f2fs_lock_op() and
|
|
* f2fs_unlock_op().
|
|
* Note that, ipage is set only by make_empty_dir.
|
|
*/
|
|
struct page *get_new_data_page(struct inode *inode,
|
|
struct page *ipage, pgoff_t index, bool new_i_size)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page;
|
|
struct dnode_of_data dn;
|
|
int err;
|
|
|
|
set_new_dnode(&dn, inode, ipage, NULL, 0);
|
|
err = f2fs_reserve_block(&dn, index);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
repeat:
|
|
page = grab_cache_page(mapping, index);
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto put_err;
|
|
}
|
|
|
|
if (PageUptodate(page))
|
|
return page;
|
|
|
|
if (dn.data_blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
|
|
SetPageUptodate(page);
|
|
} else {
|
|
err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
|
|
READ_SYNC);
|
|
if (err)
|
|
goto put_err;
|
|
|
|
lock_page(page);
|
|
if (unlikely(!PageUptodate(page))) {
|
|
f2fs_put_page(page, 1);
|
|
err = -EIO;
|
|
goto put_err;
|
|
}
|
|
if (unlikely(page->mapping != mapping)) {
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
if (new_i_size &&
|
|
i_size_read(inode) < ((index + 1) << PAGE_CACHE_SHIFT)) {
|
|
i_size_write(inode, ((index + 1) << PAGE_CACHE_SHIFT));
|
|
/* Only the directory inode sets new_i_size */
|
|
set_inode_flag(F2FS_I(inode), FI_UPDATE_DIR);
|
|
}
|
|
return page;
|
|
|
|
put_err:
|
|
f2fs_put_dnode(&dn);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int __allocate_data_block(struct dnode_of_data *dn)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
|
|
struct f2fs_summary sum;
|
|
block_t new_blkaddr;
|
|
struct node_info ni;
|
|
int type;
|
|
|
|
if (unlikely(is_inode_flag_set(F2FS_I(dn->inode), FI_NO_ALLOC)))
|
|
return -EPERM;
|
|
if (unlikely(!inc_valid_block_count(sbi, dn->inode, 1)))
|
|
return -ENOSPC;
|
|
|
|
__set_data_blkaddr(dn, NEW_ADDR);
|
|
dn->data_blkaddr = NEW_ADDR;
|
|
|
|
get_node_info(sbi, dn->nid, &ni);
|
|
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
|
|
|
|
type = CURSEG_WARM_DATA;
|
|
|
|
allocate_data_block(sbi, NULL, NULL_ADDR, &new_blkaddr, &sum, type);
|
|
|
|
/* direct IO doesn't use extent cache to maximize the performance */
|
|
set_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
|
|
update_extent_cache(new_blkaddr, dn);
|
|
clear_inode_flag(F2FS_I(dn->inode), FI_NO_EXTENT);
|
|
|
|
dn->data_blkaddr = new_blkaddr;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
|
|
* If original data blocks are allocated, then give them to blockdev.
|
|
* Otherwise,
|
|
* a. preallocate requested block addresses
|
|
* b. do not use extent cache for better performance
|
|
* c. give the block addresses to blockdev
|
|
*/
|
|
static int get_data_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
unsigned int blkbits = inode->i_sb->s_blocksize_bits;
|
|
unsigned maxblocks = bh_result->b_size >> blkbits;
|
|
struct dnode_of_data dn;
|
|
int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
|
|
pgoff_t pgofs, end_offset;
|
|
int err = 0, ofs = 1;
|
|
bool allocated = false;
|
|
|
|
/* Get the page offset from the block offset(iblock) */
|
|
pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
|
|
|
|
if (check_extent_cache(inode, pgofs, bh_result))
|
|
goto out;
|
|
|
|
if (create)
|
|
f2fs_lock_op(sbi);
|
|
|
|
/* When reading holes, we need its node page */
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = get_dnode_of_data(&dn, pgofs, mode);
|
|
if (err) {
|
|
if (err == -ENOENT)
|
|
err = 0;
|
|
goto unlock_out;
|
|
}
|
|
if (dn.data_blkaddr == NEW_ADDR)
|
|
goto put_out;
|
|
|
|
if (dn.data_blkaddr != NULL_ADDR) {
|
|
map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
|
|
} else if (create) {
|
|
err = __allocate_data_block(&dn);
|
|
if (err)
|
|
goto put_out;
|
|
allocated = true;
|
|
map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
|
|
} else {
|
|
goto put_out;
|
|
}
|
|
|
|
end_offset = IS_INODE(dn.node_page) ?
|
|
ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK;
|
|
bh_result->b_size = (((size_t)1) << blkbits);
|
|
dn.ofs_in_node++;
|
|
pgofs++;
|
|
|
|
get_next:
|
|
if (dn.ofs_in_node >= end_offset) {
|
|
if (allocated)
|
|
sync_inode_page(&dn);
|
|
allocated = false;
|
|
f2fs_put_dnode(&dn);
|
|
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = get_dnode_of_data(&dn, pgofs, mode);
|
|
if (err) {
|
|
if (err == -ENOENT)
|
|
err = 0;
|
|
goto unlock_out;
|
|
}
|
|
if (dn.data_blkaddr == NEW_ADDR)
|
|
goto put_out;
|
|
|
|
end_offset = IS_INODE(dn.node_page) ?
|
|
ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK;
|
|
}
|
|
|
|
if (maxblocks > (bh_result->b_size >> blkbits)) {
|
|
block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
|
|
if (blkaddr == NULL_ADDR && create) {
|
|
err = __allocate_data_block(&dn);
|
|
if (err)
|
|
goto sync_out;
|
|
allocated = true;
|
|
blkaddr = dn.data_blkaddr;
|
|
}
|
|
/* Give more consecutive addresses for the read ahead */
|
|
if (blkaddr == (bh_result->b_blocknr + ofs)) {
|
|
ofs++;
|
|
dn.ofs_in_node++;
|
|
pgofs++;
|
|
bh_result->b_size += (((size_t)1) << blkbits);
|
|
goto get_next;
|
|
}
|
|
}
|
|
sync_out:
|
|
if (allocated)
|
|
sync_inode_page(&dn);
|
|
put_out:
|
|
f2fs_put_dnode(&dn);
|
|
unlock_out:
|
|
if (create)
|
|
f2fs_unlock_op(sbi);
|
|
out:
|
|
trace_f2fs_get_data_block(inode, iblock, bh_result, err);
|
|
return err;
|
|
}
|
|
|
|
static int f2fs_read_data_page(struct file *file, struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
int ret;
|
|
|
|
/* If the file has inline data, try to read it directlly */
|
|
if (f2fs_has_inline_data(inode))
|
|
ret = f2fs_read_inline_data(inode, page);
|
|
else
|
|
ret = mpage_readpage(page, get_data_block);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int f2fs_read_data_pages(struct file *file,
|
|
struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
/* If the file has inline data, skip readpages */
|
|
if (f2fs_has_inline_data(inode))
|
|
return 0;
|
|
|
|
return mpage_readpages(mapping, pages, nr_pages, get_data_block);
|
|
}
|
|
|
|
int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
block_t old_blkaddr, new_blkaddr;
|
|
struct dnode_of_data dn;
|
|
int err = 0;
|
|
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
|
|
if (err)
|
|
return err;
|
|
|
|
old_blkaddr = dn.data_blkaddr;
|
|
|
|
/* This page is already truncated */
|
|
if (old_blkaddr == NULL_ADDR)
|
|
goto out_writepage;
|
|
|
|
set_page_writeback(page);
|
|
|
|
/*
|
|
* If current allocation needs SSR,
|
|
* it had better in-place writes for updated data.
|
|
*/
|
|
if (unlikely(old_blkaddr != NEW_ADDR &&
|
|
!is_cold_data(page) &&
|
|
need_inplace_update(inode))) {
|
|
rewrite_data_page(page, old_blkaddr, fio);
|
|
} else {
|
|
write_data_page(page, &dn, &new_blkaddr, fio);
|
|
update_extent_cache(new_blkaddr, &dn);
|
|
}
|
|
out_writepage:
|
|
f2fs_put_dnode(&dn);
|
|
return err;
|
|
}
|
|
|
|
static int f2fs_write_data_page(struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
loff_t i_size = i_size_read(inode);
|
|
const pgoff_t end_index = ((unsigned long long) i_size)
|
|
>> PAGE_CACHE_SHIFT;
|
|
unsigned offset = 0;
|
|
bool need_balance_fs = false;
|
|
int err = 0;
|
|
struct f2fs_io_info fio = {
|
|
.type = DATA,
|
|
.rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE,
|
|
};
|
|
|
|
if (page->index < end_index)
|
|
goto write;
|
|
|
|
/*
|
|
* If the offset is out-of-range of file size,
|
|
* this page does not have to be written to disk.
|
|
*/
|
|
offset = i_size & (PAGE_CACHE_SIZE - 1);
|
|
if ((page->index >= end_index + 1) || !offset) {
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
inode_dec_dirty_dents(inode);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
zero_user_segment(page, offset, PAGE_CACHE_SIZE);
|
|
write:
|
|
if (unlikely(sbi->por_doing)) {
|
|
err = AOP_WRITEPAGE_ACTIVATE;
|
|
goto redirty_out;
|
|
}
|
|
|
|
/* Dentry blocks are controlled by checkpoint */
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
inode_dec_dirty_dents(inode);
|
|
err = do_write_data_page(page, &fio);
|
|
} else {
|
|
f2fs_lock_op(sbi);
|
|
|
|
if (f2fs_has_inline_data(inode) || f2fs_may_inline(inode)) {
|
|
err = f2fs_write_inline_data(inode, page, offset);
|
|
f2fs_unlock_op(sbi);
|
|
goto out;
|
|
} else {
|
|
err = do_write_data_page(page, &fio);
|
|
}
|
|
|
|
f2fs_unlock_op(sbi);
|
|
need_balance_fs = true;
|
|
}
|
|
if (err == -ENOENT)
|
|
goto out;
|
|
else if (err)
|
|
goto redirty_out;
|
|
|
|
if (wbc->for_reclaim) {
|
|
f2fs_submit_merged_bio(sbi, DATA, WRITE);
|
|
need_balance_fs = false;
|
|
}
|
|
|
|
clear_cold_data(page);
|
|
out:
|
|
unlock_page(page);
|
|
if (need_balance_fs)
|
|
f2fs_balance_fs(sbi);
|
|
return 0;
|
|
|
|
redirty_out:
|
|
wbc->pages_skipped++;
|
|
set_page_dirty(page);
|
|
return err;
|
|
}
|
|
|
|
#define MAX_DESIRED_PAGES_WP 4096
|
|
|
|
static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
|
|
void *data)
|
|
{
|
|
struct address_space *mapping = data;
|
|
int ret = mapping->a_ops->writepage(page, wbc);
|
|
mapping_set_error(mapping, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int f2fs_write_data_pages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
bool locked = false;
|
|
int ret;
|
|
long excess_nrtw = 0, desired_nrtw;
|
|
|
|
/* deal with chardevs and other special file */
|
|
if (!mapping->a_ops->writepage)
|
|
return 0;
|
|
|
|
if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
|
|
desired_nrtw = MAX_DESIRED_PAGES_WP;
|
|
excess_nrtw = desired_nrtw - wbc->nr_to_write;
|
|
wbc->nr_to_write = desired_nrtw;
|
|
}
|
|
|
|
if (!S_ISDIR(inode->i_mode)) {
|
|
mutex_lock(&sbi->writepages);
|
|
locked = true;
|
|
}
|
|
ret = write_cache_pages(mapping, wbc, __f2fs_writepage, mapping);
|
|
if (locked)
|
|
mutex_unlock(&sbi->writepages);
|
|
|
|
f2fs_submit_merged_bio(sbi, DATA, WRITE);
|
|
|
|
remove_dirty_dir_inode(inode);
|
|
|
|
wbc->nr_to_write -= excess_nrtw;
|
|
return ret;
|
|
}
|
|
|
|
static int f2fs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
struct page *page;
|
|
pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
|
|
struct dnode_of_data dn;
|
|
int err = 0;
|
|
|
|
f2fs_balance_fs(sbi);
|
|
repeat:
|
|
err = f2fs_convert_inline_data(inode, pos + len);
|
|
if (err)
|
|
return err;
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
*pagep = page;
|
|
|
|
if (f2fs_has_inline_data(inode) && (pos + len) <= MAX_INLINE_DATA)
|
|
goto inline_data;
|
|
|
|
f2fs_lock_op(sbi);
|
|
set_new_dnode(&dn, inode, NULL, NULL, 0);
|
|
err = f2fs_reserve_block(&dn, index);
|
|
f2fs_unlock_op(sbi);
|
|
|
|
if (err) {
|
|
f2fs_put_page(page, 1);
|
|
return err;
|
|
}
|
|
inline_data:
|
|
if ((len == PAGE_CACHE_SIZE) || PageUptodate(page))
|
|
return 0;
|
|
|
|
if ((pos & PAGE_CACHE_MASK) >= i_size_read(inode)) {
|
|
unsigned start = pos & (PAGE_CACHE_SIZE - 1);
|
|
unsigned end = start + len;
|
|
|
|
/* Reading beyond i_size is simple: memset to zero */
|
|
zero_user_segments(page, 0, start, end, PAGE_CACHE_SIZE);
|
|
goto out;
|
|
}
|
|
|
|
if (dn.data_blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
|
|
} else {
|
|
if (f2fs_has_inline_data(inode))
|
|
err = f2fs_read_inline_data(inode, page);
|
|
else
|
|
err = f2fs_submit_page_bio(sbi, page, dn.data_blkaddr,
|
|
READ_SYNC);
|
|
if (err)
|
|
return err;
|
|
lock_page(page);
|
|
if (unlikely(!PageUptodate(page))) {
|
|
f2fs_put_page(page, 1);
|
|
return -EIO;
|
|
}
|
|
if (unlikely(page->mapping != mapping)) {
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
}
|
|
out:
|
|
SetPageUptodate(page);
|
|
clear_cold_data(page);
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_write_end(struct file *file,
|
|
struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
SetPageUptodate(page);
|
|
set_page_dirty(page);
|
|
|
|
if (pos + copied > i_size_read(inode)) {
|
|
i_size_write(inode, pos + copied);
|
|
mark_inode_dirty(inode);
|
|
update_inode_page(inode);
|
|
}
|
|
|
|
f2fs_put_page(page, 1);
|
|
return copied;
|
|
}
|
|
|
|
static int check_direct_IO(struct inode *inode, int rw,
|
|
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
|
|
{
|
|
unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
|
|
int i;
|
|
|
|
if (rw == READ)
|
|
return 0;
|
|
|
|
if (offset & blocksize_mask)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < nr_segs; i++)
|
|
if (iov[i].iov_len & blocksize_mask)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
|
|
const struct iovec *iov, loff_t offset, unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
/* Let buffer I/O handle the inline data case. */
|
|
if (f2fs_has_inline_data(inode))
|
|
return 0;
|
|
|
|
if (check_direct_IO(inode, rw, iov, offset, nr_segs))
|
|
return 0;
|
|
|
|
return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
|
|
get_data_block);
|
|
}
|
|
|
|
static void f2fs_invalidate_data_page(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
|
|
if (S_ISDIR(inode->i_mode) && PageDirty(page)) {
|
|
dec_page_count(sbi, F2FS_DIRTY_DENTS);
|
|
inode_dec_dirty_dents(inode);
|
|
}
|
|
ClearPagePrivate(page);
|
|
}
|
|
|
|
static int f2fs_release_data_page(struct page *page, gfp_t wait)
|
|
{
|
|
ClearPagePrivate(page);
|
|
return 1;
|
|
}
|
|
|
|
static int f2fs_set_data_page_dirty(struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
struct inode *inode = mapping->host;
|
|
|
|
trace_f2fs_set_page_dirty(page, DATA);
|
|
|
|
SetPageUptodate(page);
|
|
mark_inode_dirty(inode);
|
|
|
|
if (!PageDirty(page)) {
|
|
__set_page_dirty_nobuffers(page);
|
|
set_dirty_dir_page(inode, page);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
return generic_block_bmap(mapping, block, get_data_block);
|
|
}
|
|
|
|
const struct address_space_operations f2fs_dblock_aops = {
|
|
.readpage = f2fs_read_data_page,
|
|
.readpages = f2fs_read_data_pages,
|
|
.writepage = f2fs_write_data_page,
|
|
.writepages = f2fs_write_data_pages,
|
|
.write_begin = f2fs_write_begin,
|
|
.write_end = f2fs_write_end,
|
|
.set_page_dirty = f2fs_set_data_page_dirty,
|
|
.invalidatepage = f2fs_invalidate_data_page,
|
|
.releasepage = f2fs_release_data_page,
|
|
.direct_IO = f2fs_direct_IO,
|
|
.bmap = f2fs_bmap,
|
|
};
|