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![David Gstir](/assets/img/avatar_default.png)
Avoid re-use of page index as tweak for AES-XTS when multiple parts of same page are encrypted. This will happen on multiple (partial) calls of fscrypt_encrypt_page on same page. page->index is only valid for writeback pages. Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1962 lines
46 KiB
C
1962 lines
46 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/writeback.h>
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#include <linux/backing-dev.h>
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#include <linux/pagevec.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 <linux/uio.h>
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#include <linux/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/cleancache.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.h"
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#include <trace/events/f2fs.h>
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static void f2fs_read_end_io(struct bio *bio)
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{
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struct bio_vec *bvec;
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int i;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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if (time_to_inject(F2FS_P_SB(bio->bi_io_vec->bv_page), FAULT_IO))
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bio->bi_error = -EIO;
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#endif
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if (f2fs_bio_encrypted(bio)) {
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if (bio->bi_error) {
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fscrypt_release_ctx(bio->bi_private);
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} else {
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fscrypt_decrypt_bio_pages(bio->bi_private, bio);
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return;
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}
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}
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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 (!bio->bi_error) {
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if (!PageUptodate(page))
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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)
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{
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struct f2fs_sb_info *sbi = bio->bi_private;
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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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fscrypt_pullback_bio_page(&page, true);
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if (unlikely(bio->bi_error)) {
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mapping_set_error(page->mapping, -EIO);
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f2fs_stop_checkpoint(sbi, true);
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}
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end_page_writeback(page);
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}
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if (atomic_dec_and_test(&sbi->nr_wb_bios) &&
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wq_has_sleeper(&sbi->cp_wait))
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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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bio = f2fs_bio_alloc(npages);
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bio->bi_bdev = sbi->sb->s_bdev;
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bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr);
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bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
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bio->bi_private = is_read ? NULL : sbi;
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return bio;
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}
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static inline void __submit_bio(struct f2fs_sb_info *sbi,
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struct bio *bio, enum page_type type)
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{
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if (!is_read_io(bio_op(bio))) {
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atomic_inc(&sbi->nr_wb_bios);
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if (f2fs_sb_mounted_hmsmr(sbi->sb) &&
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current->plug && (type == DATA || type == NODE))
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blk_finish_plug(current->plug);
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}
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submit_bio(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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if (!io->bio)
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return;
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if (is_read_io(fio->op))
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trace_f2fs_submit_read_bio(io->sbi->sb, fio, io->bio);
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else
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trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio);
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bio_set_op_attrs(io->bio, fio->op, fio->op_flags);
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__submit_bio(io->sbi, io->bio, fio->type);
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io->bio = NULL;
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}
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static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode,
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struct page *page, nid_t ino)
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{
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struct bio_vec *bvec;
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struct page *target;
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int i;
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if (!io->bio)
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return false;
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if (!inode && !page && !ino)
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return true;
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bio_for_each_segment_all(bvec, io->bio, i) {
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if (bvec->bv_page->mapping)
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target = bvec->bv_page;
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else
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target = fscrypt_control_page(bvec->bv_page);
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if (inode && inode == target->mapping->host)
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return true;
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if (page && page == target)
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return true;
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if (ino && ino == ino_of_node(target))
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return true;
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}
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return false;
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}
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static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
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struct page *page, nid_t ino,
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enum page_type type)
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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 = &sbi->write_io[btype];
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bool ret;
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down_read(&io->io_rwsem);
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ret = __has_merged_page(io, inode, page, ino);
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up_read(&io->io_rwsem);
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return ret;
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}
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static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi,
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struct inode *inode, struct page *page,
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nid_t ino, 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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down_write(&io->io_rwsem);
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if (!__has_merged_page(io, inode, page, ino))
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goto out;
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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.op = REQ_OP_WRITE;
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if (test_opt(sbi, NOBARRIER))
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io->fio.op_flags = WRITE_FLUSH | REQ_META | REQ_PRIO;
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else
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io->fio.op_flags = WRITE_FLUSH_FUA | REQ_META |
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REQ_PRIO;
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}
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__submit_merged_bio(io);
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out:
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up_write(&io->io_rwsem);
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}
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void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type,
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int rw)
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{
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__f2fs_submit_merged_bio(sbi, NULL, NULL, 0, type, rw);
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}
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void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi,
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struct inode *inode, struct page *page,
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nid_t ino, enum page_type type, int rw)
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{
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if (has_merged_page(sbi, inode, page, ino, type))
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__f2fs_submit_merged_bio(sbi, inode, page, ino, type, rw);
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}
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void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi)
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{
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f2fs_submit_merged_bio(sbi, DATA, WRITE);
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f2fs_submit_merged_bio(sbi, NODE, WRITE);
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f2fs_submit_merged_bio(sbi, META, WRITE);
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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_io_info *fio)
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{
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struct bio *bio;
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struct page *page = fio->encrypted_page ?
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fio->encrypted_page : fio->page;
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trace_f2fs_submit_page_bio(page, fio);
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f2fs_trace_ios(fio, 0);
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/* Allocate a new bio */
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bio = __bio_alloc(fio->sbi, fio->new_blkaddr, 1, is_read_io(fio->op));
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if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
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bio_put(bio);
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return -EFAULT;
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}
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bio_set_op_attrs(bio, fio->op, fio->op_flags);
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__submit_bio(fio->sbi, bio, fio->type);
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return 0;
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}
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void f2fs_submit_page_mbio(struct f2fs_io_info *fio)
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{
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struct f2fs_sb_info *sbi = fio->sbi;
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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->op);
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struct page *bio_page;
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io = is_read ? &sbi->read_io : &sbi->write_io[btype];
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if (fio->old_blkaddr != NEW_ADDR)
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verify_block_addr(sbi, fio->old_blkaddr);
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verify_block_addr(sbi, fio->new_blkaddr);
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down_write(&io->io_rwsem);
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if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 ||
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(io->fio.op != fio->op || io->fio.op_flags != fio->op_flags)))
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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(sbi);
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io->bio = __bio_alloc(sbi, fio->new_blkaddr,
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bio_blocks, is_read);
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io->fio = *fio;
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}
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bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
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if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) <
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PAGE_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 = fio->new_blkaddr;
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f2fs_trace_ios(fio, 0);
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up_write(&io->io_rwsem);
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trace_f2fs_submit_page_mbio(fio->page, fio);
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}
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static void __set_data_blkaddr(struct dnode_of_data *dn)
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{
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struct f2fs_node *rn = F2FS_NODE(dn->node_page);
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__le32 *addr_array;
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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[dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr);
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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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void set_data_blkaddr(struct dnode_of_data *dn)
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{
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f2fs_wait_on_page_writeback(dn->node_page, NODE, true);
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__set_data_blkaddr(dn);
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if (set_page_dirty(dn->node_page))
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dn->node_changed = true;
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}
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void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr)
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{
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dn->data_blkaddr = blkaddr;
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set_data_blkaddr(dn);
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f2fs_update_extent_cache(dn);
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}
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/* dn->ofs_in_node will be returned with up-to-date last block pointer */
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int reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
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if (!count)
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return 0;
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if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
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return -EPERM;
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if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count)))
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return -ENOSPC;
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trace_f2fs_reserve_new_blocks(dn->inode, dn->nid,
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dn->ofs_in_node, count);
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f2fs_wait_on_page_writeback(dn->node_page, NODE, true);
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for (; count > 0; dn->ofs_in_node++) {
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block_t blkaddr =
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datablock_addr(dn->node_page, dn->ofs_in_node);
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if (blkaddr == NULL_ADDR) {
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dn->data_blkaddr = NEW_ADDR;
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__set_data_blkaddr(dn);
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count--;
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}
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}
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if (set_page_dirty(dn->node_page))
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dn->node_changed = true;
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return 0;
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}
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/* Should keep dn->ofs_in_node unchanged */
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int reserve_new_block(struct dnode_of_data *dn)
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{
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unsigned int ofs_in_node = dn->ofs_in_node;
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int ret;
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ret = reserve_new_blocks(dn, 1);
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dn->ofs_in_node = ofs_in_node;
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return ret;
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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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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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int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
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{
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struct extent_info ei;
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struct inode *inode = dn->inode;
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if (f2fs_lookup_extent_cache(inode, index, &ei)) {
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dn->data_blkaddr = ei.blk + index - ei.fofs;
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return 0;
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}
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return f2fs_reserve_block(dn, index);
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}
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struct page *get_read_data_page(struct inode *inode, pgoff_t index,
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int op_flags, bool for_write)
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{
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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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struct extent_info ei;
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int err;
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struct f2fs_io_info fio = {
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.sbi = F2FS_I_SB(inode),
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.type = DATA,
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.op = REQ_OP_READ,
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.op_flags = op_flags,
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.encrypted_page = NULL,
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};
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if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
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return read_mapping_page(mapping, index, NULL);
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page = f2fs_grab_cache_page(mapping, index, for_write);
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if (!page)
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return ERR_PTR(-ENOMEM);
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if (f2fs_lookup_extent_cache(inode, index, &ei)) {
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dn.data_blkaddr = ei.blk + index - ei.fofs;
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goto got_it;
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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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goto put_err;
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f2fs_put_dnode(&dn);
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if (unlikely(dn.data_blkaddr == NULL_ADDR)) {
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err = -ENOENT;
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goto put_err;
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}
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got_it:
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if (PageUptodate(page)) {
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unlock_page(page);
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return page;
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}
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/*
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* A new dentry page is allocated but not able to be written, since its
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* new inode page couldn't be allocated due to -ENOSPC.
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* In such the case, its blkaddr can be remained as NEW_ADDR.
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* see, f2fs_add_link -> get_new_data_page -> init_inode_metadata.
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*/
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if (dn.data_blkaddr == NEW_ADDR) {
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zero_user_segment(page, 0, PAGE_SIZE);
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if (!PageUptodate(page))
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SetPageUptodate(page);
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unlock_page(page);
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return page;
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}
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fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;
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fio.page = page;
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err = f2fs_submit_page_bio(&fio);
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if (err)
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goto put_err;
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return page;
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put_err:
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f2fs_put_page(page, 1);
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return ERR_PTR(err);
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}
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struct page *find_data_page(struct inode *inode, pgoff_t index)
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{
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struct address_space *mapping = inode->i_mapping;
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struct page *page;
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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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page = get_read_data_page(inode, index, READ_SYNC, false);
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if (IS_ERR(page))
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return page;
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if (PageUptodate(page))
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|
return page;
|
|
|
|
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,
|
|
bool for_write)
|
|
{
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page;
|
|
repeat:
|
|
page = get_read_data_page(inode, index, READ_SYNC, for_write);
|
|
if (IS_ERR(page))
|
|
return page;
|
|
|
|
/* wait for read completion */
|
|
lock_page(page);
|
|
if (unlikely(page->mapping != mapping)) {
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
if (unlikely(!PageUptodate(page))) {
|
|
f2fs_put_page(page, 1);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
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, and if any error occur,
|
|
* ipage should be released by this function.
|
|
*/
|
|
struct page *get_new_data_page(struct inode *inode,
|
|
struct page *ipage, pgoff_t index, bool new_i_size)
|
|
{
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page;
|
|
struct dnode_of_data dn;
|
|
int err;
|
|
|
|
page = f2fs_grab_cache_page(mapping, index, true);
|
|
if (!page) {
|
|
/*
|
|
* before exiting, we should make sure ipage will be released
|
|
* if any error occur.
|
|
*/
|
|
f2fs_put_page(ipage, 1);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
set_new_dnode(&dn, inode, ipage, NULL, 0);
|
|
err = f2fs_reserve_block(&dn, index);
|
|
if (err) {
|
|
f2fs_put_page(page, 1);
|
|
return ERR_PTR(err);
|
|
}
|
|
if (!ipage)
|
|
f2fs_put_dnode(&dn);
|
|
|
|
if (PageUptodate(page))
|
|
goto got_it;
|
|
|
|
if (dn.data_blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_SIZE);
|
|
if (!PageUptodate(page))
|
|
SetPageUptodate(page);
|
|
} else {
|
|
f2fs_put_page(page, 1);
|
|
|
|
/* if ipage exists, blkaddr should be NEW_ADDR */
|
|
f2fs_bug_on(F2FS_I_SB(inode), ipage);
|
|
page = get_lock_data_page(inode, index, true);
|
|
if (IS_ERR(page))
|
|
return page;
|
|
}
|
|
got_it:
|
|
if (new_i_size && i_size_read(inode) <
|
|
((loff_t)(index + 1) << PAGE_SHIFT))
|
|
f2fs_i_size_write(inode, ((loff_t)(index + 1) << PAGE_SHIFT));
|
|
return page;
|
|
}
|
|
|
|
static int __allocate_data_block(struct dnode_of_data *dn)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
|
|
struct f2fs_summary sum;
|
|
struct node_info ni;
|
|
int seg = CURSEG_WARM_DATA;
|
|
pgoff_t fofs;
|
|
blkcnt_t count = 1;
|
|
|
|
if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC)))
|
|
return -EPERM;
|
|
|
|
dn->data_blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node);
|
|
if (dn->data_blkaddr == NEW_ADDR)
|
|
goto alloc;
|
|
|
|
if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count)))
|
|
return -ENOSPC;
|
|
|
|
alloc:
|
|
get_node_info(sbi, dn->nid, &ni);
|
|
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);
|
|
|
|
if (dn->ofs_in_node == 0 && dn->inode_page == dn->node_page)
|
|
seg = CURSEG_DIRECT_IO;
|
|
|
|
allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr,
|
|
&sum, seg);
|
|
set_data_blkaddr(dn);
|
|
|
|
/* update i_size */
|
|
fofs = start_bidx_of_node(ofs_of_node(dn->node_page), dn->inode) +
|
|
dn->ofs_in_node;
|
|
if (i_size_read(dn->inode) < ((loff_t)(fofs + 1) << PAGE_SHIFT))
|
|
f2fs_i_size_write(dn->inode,
|
|
((loff_t)(fofs + 1) << PAGE_SHIFT));
|
|
return 0;
|
|
}
|
|
|
|
ssize_t f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct f2fs_map_blocks map;
|
|
ssize_t ret = 0;
|
|
|
|
map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
|
|
map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
|
|
if (map.m_len > map.m_lblk)
|
|
map.m_len -= map.m_lblk;
|
|
else
|
|
map.m_len = 0;
|
|
|
|
map.m_next_pgofs = NULL;
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
ret = f2fs_convert_inline_inode(inode);
|
|
if (ret)
|
|
return ret;
|
|
return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
|
|
}
|
|
if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA) {
|
|
ret = f2fs_convert_inline_inode(inode);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
if (!f2fs_has_inline_data(inode))
|
|
return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
|
|
* f2fs_map_blocks structure.
|
|
* 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
|
|
*/
|
|
int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
|
|
int create, int flag)
|
|
{
|
|
unsigned int maxblocks = map->m_len;
|
|
struct dnode_of_data dn;
|
|
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
|
|
int mode = create ? ALLOC_NODE : LOOKUP_NODE;
|
|
pgoff_t pgofs, end_offset, end;
|
|
int err = 0, ofs = 1;
|
|
unsigned int ofs_in_node, last_ofs_in_node;
|
|
blkcnt_t prealloc;
|
|
struct extent_info ei;
|
|
bool allocated = false;
|
|
block_t blkaddr;
|
|
|
|
if (!maxblocks)
|
|
return 0;
|
|
|
|
map->m_len = 0;
|
|
map->m_flags = 0;
|
|
|
|
/* it only supports block size == page size */
|
|
pgofs = (pgoff_t)map->m_lblk;
|
|
end = pgofs + maxblocks;
|
|
|
|
if (!create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
|
|
map->m_pblk = ei.blk + pgofs - ei.fofs;
|
|
map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
|
|
map->m_flags = F2FS_MAP_MAPPED;
|
|
goto out;
|
|
}
|
|
|
|
next_dnode:
|
|
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 (flag == F2FS_GET_BLOCK_BMAP)
|
|
map->m_pblk = 0;
|
|
if (err == -ENOENT) {
|
|
err = 0;
|
|
if (map->m_next_pgofs)
|
|
*map->m_next_pgofs =
|
|
get_next_page_offset(&dn, pgofs);
|
|
}
|
|
goto unlock_out;
|
|
}
|
|
|
|
prealloc = 0;
|
|
ofs_in_node = dn.ofs_in_node;
|
|
end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
|
|
|
|
next_block:
|
|
blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
|
|
|
|
if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR) {
|
|
if (create) {
|
|
if (unlikely(f2fs_cp_error(sbi))) {
|
|
err = -EIO;
|
|
goto sync_out;
|
|
}
|
|
if (flag == F2FS_GET_BLOCK_PRE_AIO) {
|
|
if (blkaddr == NULL_ADDR) {
|
|
prealloc++;
|
|
last_ofs_in_node = dn.ofs_in_node;
|
|
}
|
|
} else {
|
|
err = __allocate_data_block(&dn);
|
|
if (!err) {
|
|
set_inode_flag(inode, FI_APPEND_WRITE);
|
|
allocated = true;
|
|
}
|
|
}
|
|
if (err)
|
|
goto sync_out;
|
|
map->m_flags = F2FS_MAP_NEW;
|
|
blkaddr = dn.data_blkaddr;
|
|
} else {
|
|
if (flag == F2FS_GET_BLOCK_BMAP) {
|
|
map->m_pblk = 0;
|
|
goto sync_out;
|
|
}
|
|
if (flag == F2FS_GET_BLOCK_FIEMAP &&
|
|
blkaddr == NULL_ADDR) {
|
|
if (map->m_next_pgofs)
|
|
*map->m_next_pgofs = pgofs + 1;
|
|
}
|
|
if (flag != F2FS_GET_BLOCK_FIEMAP ||
|
|
blkaddr != NEW_ADDR)
|
|
goto sync_out;
|
|
}
|
|
}
|
|
|
|
if (flag == F2FS_GET_BLOCK_PRE_AIO)
|
|
goto skip;
|
|
|
|
if (map->m_len == 0) {
|
|
/* preallocated unwritten block should be mapped for fiemap. */
|
|
if (blkaddr == NEW_ADDR)
|
|
map->m_flags |= F2FS_MAP_UNWRITTEN;
|
|
map->m_flags |= F2FS_MAP_MAPPED;
|
|
|
|
map->m_pblk = blkaddr;
|
|
map->m_len = 1;
|
|
} else if ((map->m_pblk != NEW_ADDR &&
|
|
blkaddr == (map->m_pblk + ofs)) ||
|
|
(map->m_pblk == NEW_ADDR && blkaddr == NEW_ADDR) ||
|
|
flag == F2FS_GET_BLOCK_PRE_DIO) {
|
|
ofs++;
|
|
map->m_len++;
|
|
} else {
|
|
goto sync_out;
|
|
}
|
|
|
|
skip:
|
|
dn.ofs_in_node++;
|
|
pgofs++;
|
|
|
|
/* preallocate blocks in batch for one dnode page */
|
|
if (flag == F2FS_GET_BLOCK_PRE_AIO &&
|
|
(pgofs == end || dn.ofs_in_node == end_offset)) {
|
|
|
|
dn.ofs_in_node = ofs_in_node;
|
|
err = reserve_new_blocks(&dn, prealloc);
|
|
if (err)
|
|
goto sync_out;
|
|
allocated = dn.node_changed;
|
|
|
|
map->m_len += dn.ofs_in_node - ofs_in_node;
|
|
if (prealloc && dn.ofs_in_node != last_ofs_in_node + 1) {
|
|
err = -ENOSPC;
|
|
goto sync_out;
|
|
}
|
|
dn.ofs_in_node = end_offset;
|
|
}
|
|
|
|
if (pgofs >= end)
|
|
goto sync_out;
|
|
else if (dn.ofs_in_node < end_offset)
|
|
goto next_block;
|
|
|
|
f2fs_put_dnode(&dn);
|
|
|
|
if (create) {
|
|
f2fs_unlock_op(sbi);
|
|
f2fs_balance_fs(sbi, allocated);
|
|
}
|
|
allocated = false;
|
|
goto next_dnode;
|
|
|
|
sync_out:
|
|
f2fs_put_dnode(&dn);
|
|
unlock_out:
|
|
if (create) {
|
|
f2fs_unlock_op(sbi);
|
|
f2fs_balance_fs(sbi, allocated);
|
|
}
|
|
out:
|
|
trace_f2fs_map_blocks(inode, map, err);
|
|
return err;
|
|
}
|
|
|
|
static int __get_data_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh, int create, int flag,
|
|
pgoff_t *next_pgofs)
|
|
{
|
|
struct f2fs_map_blocks map;
|
|
int ret;
|
|
|
|
map.m_lblk = iblock;
|
|
map.m_len = bh->b_size >> inode->i_blkbits;
|
|
map.m_next_pgofs = next_pgofs;
|
|
|
|
ret = f2fs_map_blocks(inode, &map, create, flag);
|
|
if (!ret) {
|
|
map_bh(bh, inode->i_sb, map.m_pblk);
|
|
bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
|
|
bh->b_size = map.m_len << inode->i_blkbits;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int get_data_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create, int flag,
|
|
pgoff_t *next_pgofs)
|
|
{
|
|
return __get_data_block(inode, iblock, bh_result, create,
|
|
flag, next_pgofs);
|
|
}
|
|
|
|
static int get_data_block_dio(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
return __get_data_block(inode, iblock, bh_result, create,
|
|
F2FS_GET_BLOCK_DIO, NULL);
|
|
}
|
|
|
|
static int get_data_block_bmap(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
/* Block number less than F2FS MAX BLOCKS */
|
|
if (unlikely(iblock >= F2FS_I_SB(inode)->max_file_blocks))
|
|
return -EFBIG;
|
|
|
|
return __get_data_block(inode, iblock, bh_result, create,
|
|
F2FS_GET_BLOCK_BMAP, NULL);
|
|
}
|
|
|
|
static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
|
|
{
|
|
return (offset >> inode->i_blkbits);
|
|
}
|
|
|
|
static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
|
|
{
|
|
return (blk << inode->i_blkbits);
|
|
}
|
|
|
|
int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
u64 start, u64 len)
|
|
{
|
|
struct buffer_head map_bh;
|
|
sector_t start_blk, last_blk;
|
|
pgoff_t next_pgofs;
|
|
loff_t isize;
|
|
u64 logical = 0, phys = 0, size = 0;
|
|
u32 flags = 0;
|
|
int ret = 0;
|
|
|
|
ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (f2fs_has_inline_data(inode)) {
|
|
ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
|
|
if (ret != -EAGAIN)
|
|
return ret;
|
|
}
|
|
|
|
inode_lock(inode);
|
|
|
|
isize = i_size_read(inode);
|
|
if (start >= isize)
|
|
goto out;
|
|
|
|
if (start + len > isize)
|
|
len = isize - start;
|
|
|
|
if (logical_to_blk(inode, len) == 0)
|
|
len = blk_to_logical(inode, 1);
|
|
|
|
start_blk = logical_to_blk(inode, start);
|
|
last_blk = logical_to_blk(inode, start + len - 1);
|
|
|
|
next:
|
|
memset(&map_bh, 0, sizeof(struct buffer_head));
|
|
map_bh.b_size = len;
|
|
|
|
ret = get_data_block(inode, start_blk, &map_bh, 0,
|
|
F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* HOLE */
|
|
if (!buffer_mapped(&map_bh)) {
|
|
start_blk = next_pgofs;
|
|
/* Go through holes util pass the EOF */
|
|
if (blk_to_logical(inode, start_blk) < isize)
|
|
goto prep_next;
|
|
/* Found a hole beyond isize means no more extents.
|
|
* Note that the premise is that filesystems don't
|
|
* punch holes beyond isize and keep size unchanged.
|
|
*/
|
|
flags |= FIEMAP_EXTENT_LAST;
|
|
}
|
|
|
|
if (size) {
|
|
if (f2fs_encrypted_inode(inode))
|
|
flags |= FIEMAP_EXTENT_DATA_ENCRYPTED;
|
|
|
|
ret = fiemap_fill_next_extent(fieinfo, logical,
|
|
phys, size, flags);
|
|
}
|
|
|
|
if (start_blk > last_blk || ret)
|
|
goto out;
|
|
|
|
logical = blk_to_logical(inode, start_blk);
|
|
phys = blk_to_logical(inode, map_bh.b_blocknr);
|
|
size = map_bh.b_size;
|
|
flags = 0;
|
|
if (buffer_unwritten(&map_bh))
|
|
flags = FIEMAP_EXTENT_UNWRITTEN;
|
|
|
|
start_blk += logical_to_blk(inode, size);
|
|
|
|
prep_next:
|
|
cond_resched();
|
|
if (fatal_signal_pending(current))
|
|
ret = -EINTR;
|
|
else
|
|
goto next;
|
|
out:
|
|
if (ret == 1)
|
|
ret = 0;
|
|
|
|
inode_unlock(inode);
|
|
return ret;
|
|
}
|
|
|
|
static struct bio *f2fs_grab_bio(struct inode *inode, block_t blkaddr,
|
|
unsigned nr_pages)
|
|
{
|
|
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
|
|
struct fscrypt_ctx *ctx = NULL;
|
|
struct block_device *bdev = sbi->sb->s_bdev;
|
|
struct bio *bio;
|
|
|
|
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) {
|
|
ctx = fscrypt_get_ctx(inode, GFP_NOFS);
|
|
if (IS_ERR(ctx))
|
|
return ERR_CAST(ctx);
|
|
|
|
/* wait the page to be moved by cleaning */
|
|
f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
|
|
}
|
|
|
|
bio = bio_alloc(GFP_KERNEL, min_t(int, nr_pages, BIO_MAX_PAGES));
|
|
if (!bio) {
|
|
if (ctx)
|
|
fscrypt_release_ctx(ctx);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
bio->bi_bdev = bdev;
|
|
bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blkaddr);
|
|
bio->bi_end_io = f2fs_read_end_io;
|
|
bio->bi_private = ctx;
|
|
|
|
return bio;
|
|
}
|
|
|
|
/*
|
|
* This function was originally taken from fs/mpage.c, and customized for f2fs.
|
|
* Major change was from block_size == page_size in f2fs by default.
|
|
*/
|
|
static int f2fs_mpage_readpages(struct address_space *mapping,
|
|
struct list_head *pages, struct page *page,
|
|
unsigned nr_pages)
|
|
{
|
|
struct bio *bio = NULL;
|
|
unsigned page_idx;
|
|
sector_t last_block_in_bio = 0;
|
|
struct inode *inode = mapping->host;
|
|
const unsigned blkbits = inode->i_blkbits;
|
|
const unsigned blocksize = 1 << blkbits;
|
|
sector_t block_in_file;
|
|
sector_t last_block;
|
|
sector_t last_block_in_file;
|
|
sector_t block_nr;
|
|
struct f2fs_map_blocks map;
|
|
|
|
map.m_pblk = 0;
|
|
map.m_lblk = 0;
|
|
map.m_len = 0;
|
|
map.m_flags = 0;
|
|
map.m_next_pgofs = NULL;
|
|
|
|
for (page_idx = 0; nr_pages; page_idx++, nr_pages--) {
|
|
|
|
prefetchw(&page->flags);
|
|
if (pages) {
|
|
page = list_entry(pages->prev, struct page, lru);
|
|
list_del(&page->lru);
|
|
if (add_to_page_cache_lru(page, mapping,
|
|
page->index,
|
|
readahead_gfp_mask(mapping)))
|
|
goto next_page;
|
|
}
|
|
|
|
block_in_file = (sector_t)page->index;
|
|
last_block = block_in_file + nr_pages;
|
|
last_block_in_file = (i_size_read(inode) + blocksize - 1) >>
|
|
blkbits;
|
|
if (last_block > last_block_in_file)
|
|
last_block = last_block_in_file;
|
|
|
|
/*
|
|
* Map blocks using the previous result first.
|
|
*/
|
|
if ((map.m_flags & F2FS_MAP_MAPPED) &&
|
|
block_in_file > map.m_lblk &&
|
|
block_in_file < (map.m_lblk + map.m_len))
|
|
goto got_it;
|
|
|
|
/*
|
|
* Then do more f2fs_map_blocks() calls until we are
|
|
* done with this page.
|
|
*/
|
|
map.m_flags = 0;
|
|
|
|
if (block_in_file < last_block) {
|
|
map.m_lblk = block_in_file;
|
|
map.m_len = last_block - block_in_file;
|
|
|
|
if (f2fs_map_blocks(inode, &map, 0,
|
|
F2FS_GET_BLOCK_READ))
|
|
goto set_error_page;
|
|
}
|
|
got_it:
|
|
if ((map.m_flags & F2FS_MAP_MAPPED)) {
|
|
block_nr = map.m_pblk + block_in_file - map.m_lblk;
|
|
SetPageMappedToDisk(page);
|
|
|
|
if (!PageUptodate(page) && !cleancache_get_page(page)) {
|
|
SetPageUptodate(page);
|
|
goto confused;
|
|
}
|
|
} else {
|
|
zero_user_segment(page, 0, PAGE_SIZE);
|
|
if (!PageUptodate(page))
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
goto next_page;
|
|
}
|
|
|
|
/*
|
|
* This page will go to BIO. Do we need to send this
|
|
* BIO off first?
|
|
*/
|
|
if (bio && (last_block_in_bio != block_nr - 1)) {
|
|
submit_and_realloc:
|
|
__submit_bio(F2FS_I_SB(inode), bio, DATA);
|
|
bio = NULL;
|
|
}
|
|
if (bio == NULL) {
|
|
bio = f2fs_grab_bio(inode, block_nr, nr_pages);
|
|
if (IS_ERR(bio)) {
|
|
bio = NULL;
|
|
goto set_error_page;
|
|
}
|
|
bio_set_op_attrs(bio, REQ_OP_READ, 0);
|
|
}
|
|
|
|
if (bio_add_page(bio, page, blocksize, 0) < blocksize)
|
|
goto submit_and_realloc;
|
|
|
|
last_block_in_bio = block_nr;
|
|
goto next_page;
|
|
set_error_page:
|
|
SetPageError(page);
|
|
zero_user_segment(page, 0, PAGE_SIZE);
|
|
unlock_page(page);
|
|
goto next_page;
|
|
confused:
|
|
if (bio) {
|
|
__submit_bio(F2FS_I_SB(inode), bio, DATA);
|
|
bio = NULL;
|
|
}
|
|
unlock_page(page);
|
|
next_page:
|
|
if (pages)
|
|
put_page(page);
|
|
}
|
|
BUG_ON(pages && !list_empty(pages));
|
|
if (bio)
|
|
__submit_bio(F2FS_I_SB(inode), bio, DATA);
|
|
return 0;
|
|
}
|
|
|
|
static int f2fs_read_data_page(struct file *file, struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
int ret = -EAGAIN;
|
|
|
|
trace_f2fs_readpage(page, DATA);
|
|
|
|
/* If the file has inline data, try to read it directly */
|
|
if (f2fs_has_inline_data(inode))
|
|
ret = f2fs_read_inline_data(inode, page);
|
|
if (ret == -EAGAIN)
|
|
ret = f2fs_mpage_readpages(page->mapping, NULL, page, 1);
|
|
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;
|
|
struct page *page = list_entry(pages->prev, struct page, lru);
|
|
|
|
trace_f2fs_readpages(inode, page, nr_pages);
|
|
|
|
/* If the file has inline data, skip readpages */
|
|
if (f2fs_has_inline_data(inode))
|
|
return 0;
|
|
|
|
return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages);
|
|
}
|
|
|
|
int do_write_data_page(struct f2fs_io_info *fio)
|
|
{
|
|
struct page *page = fio->page;
|
|
struct inode *inode = page->mapping->host;
|
|
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;
|
|
|
|
fio->old_blkaddr = dn.data_blkaddr;
|
|
|
|
/* This page is already truncated */
|
|
if (fio->old_blkaddr == NULL_ADDR) {
|
|
ClearPageUptodate(page);
|
|
goto out_writepage;
|
|
}
|
|
|
|
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) {
|
|
gfp_t gfp_flags = GFP_NOFS;
|
|
|
|
/* wait for GCed encrypted page writeback */
|
|
f2fs_wait_on_encrypted_page_writeback(F2FS_I_SB(inode),
|
|
fio->old_blkaddr);
|
|
retry_encrypt:
|
|
BUG_ON(!PageLocked(fio->page));
|
|
fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
|
|
PAGE_SIZE, 0,
|
|
fio->page->index,
|
|
gfp_flags);
|
|
if (IS_ERR(fio->encrypted_page)) {
|
|
err = PTR_ERR(fio->encrypted_page);
|
|
if (err == -ENOMEM) {
|
|
/* flush pending ios and wait for a while */
|
|
f2fs_flush_merged_bios(F2FS_I_SB(inode));
|
|
congestion_wait(BLK_RW_ASYNC, HZ/50);
|
|
gfp_flags |= __GFP_NOFAIL;
|
|
err = 0;
|
|
goto retry_encrypt;
|
|
}
|
|
goto out_writepage;
|
|
}
|
|
}
|
|
|
|
set_page_writeback(page);
|
|
|
|
/*
|
|
* If current allocation needs SSR,
|
|
* it had better in-place writes for updated data.
|
|
*/
|
|
if (unlikely(fio->old_blkaddr != NEW_ADDR &&
|
|
!is_cold_data(page) &&
|
|
!IS_ATOMIC_WRITTEN_PAGE(page) &&
|
|
need_inplace_update(inode))) {
|
|
rewrite_data_page(fio);
|
|
set_inode_flag(inode, FI_UPDATE_WRITE);
|
|
trace_f2fs_do_write_data_page(page, IPU);
|
|
} else {
|
|
write_data_page(&dn, fio);
|
|
trace_f2fs_do_write_data_page(page, OPU);
|
|
set_inode_flag(inode, FI_APPEND_WRITE);
|
|
if (page->index == 0)
|
|
set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
|
|
}
|
|
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_I_SB(inode);
|
|
loff_t i_size = i_size_read(inode);
|
|
const pgoff_t end_index = ((unsigned long long) i_size)
|
|
>> PAGE_SHIFT;
|
|
loff_t psize = (page->index + 1) << PAGE_SHIFT;
|
|
unsigned offset = 0;
|
|
bool need_balance_fs = false;
|
|
int err = 0;
|
|
struct f2fs_io_info fio = {
|
|
.sbi = sbi,
|
|
.type = DATA,
|
|
.op = REQ_OP_WRITE,
|
|
.op_flags = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : 0,
|
|
.page = page,
|
|
.encrypted_page = NULL,
|
|
};
|
|
|
|
trace_f2fs_writepage(page, DATA);
|
|
|
|
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_SIZE - 1);
|
|
if ((page->index >= end_index + 1) || !offset)
|
|
goto out;
|
|
|
|
zero_user_segment(page, offset, PAGE_SIZE);
|
|
write:
|
|
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
|
|
goto redirty_out;
|
|
if (f2fs_is_drop_cache(inode))
|
|
goto out;
|
|
/* we should not write 0'th page having journal header */
|
|
if (f2fs_is_volatile_file(inode) && (!page->index ||
|
|
(!wbc->for_reclaim &&
|
|
available_free_memory(sbi, BASE_CHECK))))
|
|
goto redirty_out;
|
|
|
|
/* we should bypass data pages to proceed the kworkder jobs */
|
|
if (unlikely(f2fs_cp_error(sbi))) {
|
|
mapping_set_error(page->mapping, -EIO);
|
|
goto out;
|
|
}
|
|
|
|
/* Dentry blocks are controlled by checkpoint */
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
err = do_write_data_page(&fio);
|
|
goto done;
|
|
}
|
|
|
|
if (!wbc->for_reclaim)
|
|
need_balance_fs = true;
|
|
else if (has_not_enough_free_secs(sbi, 0, 0))
|
|
goto redirty_out;
|
|
|
|
err = -EAGAIN;
|
|
f2fs_lock_op(sbi);
|
|
if (f2fs_has_inline_data(inode))
|
|
err = f2fs_write_inline_data(inode, page);
|
|
if (err == -EAGAIN)
|
|
err = do_write_data_page(&fio);
|
|
if (F2FS_I(inode)->last_disk_size < psize)
|
|
F2FS_I(inode)->last_disk_size = psize;
|
|
f2fs_unlock_op(sbi);
|
|
done:
|
|
if (err && err != -ENOENT)
|
|
goto redirty_out;
|
|
|
|
clear_cold_data(page);
|
|
out:
|
|
inode_dec_dirty_pages(inode);
|
|
if (err)
|
|
ClearPageUptodate(page);
|
|
|
|
if (wbc->for_reclaim) {
|
|
f2fs_submit_merged_bio_cond(sbi, NULL, page, 0, DATA, WRITE);
|
|
remove_dirty_inode(inode);
|
|
}
|
|
|
|
unlock_page(page);
|
|
f2fs_balance_fs(sbi, need_balance_fs);
|
|
|
|
if (unlikely(f2fs_cp_error(sbi)))
|
|
f2fs_submit_merged_bio(sbi, DATA, WRITE);
|
|
|
|
return 0;
|
|
|
|
redirty_out:
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This function was copied from write_cche_pages from mm/page-writeback.c.
|
|
* The major change is making write step of cold data page separately from
|
|
* warm/hot data page.
|
|
*/
|
|
static int f2fs_write_cache_pages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
int ret = 0;
|
|
int done = 0;
|
|
struct pagevec pvec;
|
|
int nr_pages;
|
|
pgoff_t uninitialized_var(writeback_index);
|
|
pgoff_t index;
|
|
pgoff_t end; /* Inclusive */
|
|
pgoff_t done_index;
|
|
int cycled;
|
|
int range_whole = 0;
|
|
int tag;
|
|
int nwritten = 0;
|
|
|
|
pagevec_init(&pvec, 0);
|
|
|
|
if (wbc->range_cyclic) {
|
|
writeback_index = mapping->writeback_index; /* prev offset */
|
|
index = writeback_index;
|
|
if (index == 0)
|
|
cycled = 1;
|
|
else
|
|
cycled = 0;
|
|
end = -1;
|
|
} else {
|
|
index = wbc->range_start >> PAGE_SHIFT;
|
|
end = wbc->range_end >> PAGE_SHIFT;
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
|
range_whole = 1;
|
|
cycled = 1; /* ignore range_cyclic tests */
|
|
}
|
|
if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
|
|
tag = PAGECACHE_TAG_TOWRITE;
|
|
else
|
|
tag = PAGECACHE_TAG_DIRTY;
|
|
retry:
|
|
if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
|
|
tag_pages_for_writeback(mapping, index, end);
|
|
done_index = index;
|
|
while (!done && (index <= end)) {
|
|
int i;
|
|
|
|
nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
|
|
min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1);
|
|
if (nr_pages == 0)
|
|
break;
|
|
|
|
for (i = 0; i < nr_pages; i++) {
|
|
struct page *page = pvec.pages[i];
|
|
|
|
if (page->index > end) {
|
|
done = 1;
|
|
break;
|
|
}
|
|
|
|
done_index = page->index;
|
|
|
|
lock_page(page);
|
|
|
|
if (unlikely(page->mapping != mapping)) {
|
|
continue_unlock:
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
|
|
if (!PageDirty(page)) {
|
|
/* someone wrote it for us */
|
|
goto continue_unlock;
|
|
}
|
|
|
|
if (PageWriteback(page)) {
|
|
if (wbc->sync_mode != WB_SYNC_NONE)
|
|
f2fs_wait_on_page_writeback(page,
|
|
DATA, true);
|
|
else
|
|
goto continue_unlock;
|
|
}
|
|
|
|
BUG_ON(PageWriteback(page));
|
|
if (!clear_page_dirty_for_io(page))
|
|
goto continue_unlock;
|
|
|
|
ret = mapping->a_ops->writepage(page, wbc);
|
|
if (unlikely(ret)) {
|
|
done_index = page->index + 1;
|
|
done = 1;
|
|
break;
|
|
} else {
|
|
nwritten++;
|
|
}
|
|
|
|
if (--wbc->nr_to_write <= 0 &&
|
|
wbc->sync_mode == WB_SYNC_NONE) {
|
|
done = 1;
|
|
break;
|
|
}
|
|
}
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
}
|
|
|
|
if (!cycled && !done) {
|
|
cycled = 1;
|
|
index = 0;
|
|
end = writeback_index - 1;
|
|
goto retry;
|
|
}
|
|
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
|
mapping->writeback_index = done_index;
|
|
|
|
if (nwritten)
|
|
f2fs_submit_merged_bio_cond(F2FS_M_SB(mapping), mapping->host,
|
|
NULL, 0, DATA, WRITE);
|
|
|
|
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_I_SB(inode);
|
|
struct blk_plug plug;
|
|
int ret;
|
|
|
|
/* deal with chardevs and other special file */
|
|
if (!mapping->a_ops->writepage)
|
|
return 0;
|
|
|
|
/* skip writing if there is no dirty page in this inode */
|
|
if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
|
|
return 0;
|
|
|
|
if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
|
|
get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
|
|
available_free_memory(sbi, DIRTY_DENTS))
|
|
goto skip_write;
|
|
|
|
/* skip writing during file defragment */
|
|
if (is_inode_flag_set(inode, FI_DO_DEFRAG))
|
|
goto skip_write;
|
|
|
|
/* during POR, we don't need to trigger writepage at all. */
|
|
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
|
|
goto skip_write;
|
|
|
|
trace_f2fs_writepages(mapping->host, wbc, DATA);
|
|
|
|
blk_start_plug(&plug);
|
|
ret = f2fs_write_cache_pages(mapping, wbc);
|
|
blk_finish_plug(&plug);
|
|
/*
|
|
* if some pages were truncated, we cannot guarantee its mapping->host
|
|
* to detect pending bios.
|
|
*/
|
|
|
|
remove_dirty_inode(inode);
|
|
return ret;
|
|
|
|
skip_write:
|
|
wbc->pages_skipped += get_dirty_pages(inode);
|
|
trace_f2fs_writepages(mapping->host, wbc, DATA);
|
|
return 0;
|
|
}
|
|
|
|
static void f2fs_write_failed(struct address_space *mapping, loff_t to)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
loff_t i_size = i_size_read(inode);
|
|
|
|
if (to > i_size) {
|
|
truncate_pagecache(inode, i_size);
|
|
truncate_blocks(inode, i_size, true);
|
|
}
|
|
}
|
|
|
|
static int prepare_write_begin(struct f2fs_sb_info *sbi,
|
|
struct page *page, loff_t pos, unsigned len,
|
|
block_t *blk_addr, bool *node_changed)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
pgoff_t index = page->index;
|
|
struct dnode_of_data dn;
|
|
struct page *ipage;
|
|
bool locked = false;
|
|
struct extent_info ei;
|
|
int err = 0;
|
|
|
|
/*
|
|
* we already allocated all the blocks, so we don't need to get
|
|
* the block addresses when there is no need to fill the page.
|
|
*/
|
|
if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE)
|
|
return 0;
|
|
|
|
if (f2fs_has_inline_data(inode) ||
|
|
(pos & PAGE_MASK) >= i_size_read(inode)) {
|
|
f2fs_lock_op(sbi);
|
|
locked = true;
|
|
}
|
|
restart:
|
|
/* check inline_data */
|
|
ipage = get_node_page(sbi, inode->i_ino);
|
|
if (IS_ERR(ipage)) {
|
|
err = PTR_ERR(ipage);
|
|
goto unlock_out;
|
|
}
|
|
|
|
set_new_dnode(&dn, inode, ipage, ipage, 0);
|
|
|
|
if (f2fs_has_inline_data(inode)) {
|
|
if (pos + len <= MAX_INLINE_DATA) {
|
|
read_inline_data(page, ipage);
|
|
set_inode_flag(inode, FI_DATA_EXIST);
|
|
if (inode->i_nlink)
|
|
set_inline_node(ipage);
|
|
} else {
|
|
err = f2fs_convert_inline_page(&dn, page);
|
|
if (err)
|
|
goto out;
|
|
if (dn.data_blkaddr == NULL_ADDR)
|
|
err = f2fs_get_block(&dn, index);
|
|
}
|
|
} else if (locked) {
|
|
err = f2fs_get_block(&dn, index);
|
|
} else {
|
|
if (f2fs_lookup_extent_cache(inode, index, &ei)) {
|
|
dn.data_blkaddr = ei.blk + index - ei.fofs;
|
|
} else {
|
|
/* hole case */
|
|
err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
|
|
if (err || dn.data_blkaddr == NULL_ADDR) {
|
|
f2fs_put_dnode(&dn);
|
|
f2fs_lock_op(sbi);
|
|
locked = true;
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* convert_inline_page can make node_changed */
|
|
*blk_addr = dn.data_blkaddr;
|
|
*node_changed = dn.node_changed;
|
|
out:
|
|
f2fs_put_dnode(&dn);
|
|
unlock_out:
|
|
if (locked)
|
|
f2fs_unlock_op(sbi);
|
|
return err;
|
|
}
|
|
|
|
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_I_SB(inode);
|
|
struct page *page = NULL;
|
|
pgoff_t index = ((unsigned long long) pos) >> PAGE_SHIFT;
|
|
bool need_balance = false;
|
|
block_t blkaddr = NULL_ADDR;
|
|
int err = 0;
|
|
|
|
trace_f2fs_write_begin(inode, pos, len, flags);
|
|
|
|
/*
|
|
* We should check this at this moment to avoid deadlock on inode page
|
|
* and #0 page. The locking rule for inline_data conversion should be:
|
|
* lock_page(page #0) -> lock_page(inode_page)
|
|
*/
|
|
if (index != 0) {
|
|
err = f2fs_convert_inline_inode(inode);
|
|
if (err)
|
|
goto fail;
|
|
}
|
|
repeat:
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
*pagep = page;
|
|
|
|
err = prepare_write_begin(sbi, page, pos, len,
|
|
&blkaddr, &need_balance);
|
|
if (err)
|
|
goto fail;
|
|
|
|
if (need_balance && has_not_enough_free_secs(sbi, 0, 0)) {
|
|
unlock_page(page);
|
|
f2fs_balance_fs(sbi, true);
|
|
lock_page(page);
|
|
if (page->mapping != mapping) {
|
|
/* The page got truncated from under us */
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
}
|
|
|
|
f2fs_wait_on_page_writeback(page, DATA, false);
|
|
|
|
/* wait for GCed encrypted page writeback */
|
|
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
|
|
f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
|
|
|
|
if (len == PAGE_SIZE || PageUptodate(page))
|
|
return 0;
|
|
|
|
if (blkaddr == NEW_ADDR) {
|
|
zero_user_segment(page, 0, PAGE_SIZE);
|
|
SetPageUptodate(page);
|
|
} else {
|
|
struct bio *bio;
|
|
|
|
bio = f2fs_grab_bio(inode, blkaddr, 1);
|
|
if (IS_ERR(bio)) {
|
|
err = PTR_ERR(bio);
|
|
goto fail;
|
|
}
|
|
bio_set_op_attrs(bio, REQ_OP_READ, READ_SYNC);
|
|
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
|
|
bio_put(bio);
|
|
err = -EFAULT;
|
|
goto fail;
|
|
}
|
|
|
|
__submit_bio(sbi, bio, DATA);
|
|
|
|
lock_page(page);
|
|
if (unlikely(page->mapping != mapping)) {
|
|
f2fs_put_page(page, 1);
|
|
goto repeat;
|
|
}
|
|
if (unlikely(!PageUptodate(page))) {
|
|
err = -EIO;
|
|
goto fail;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
fail:
|
|
f2fs_put_page(page, 1);
|
|
f2fs_write_failed(mapping, pos + len);
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
|
|
trace_f2fs_write_end(inode, pos, len, copied);
|
|
|
|
/*
|
|
* This should be come from len == PAGE_SIZE, and we expect copied
|
|
* should be PAGE_SIZE. Otherwise, we treat it with zero copied and
|
|
* let generic_perform_write() try to copy data again through copied=0.
|
|
*/
|
|
if (!PageUptodate(page)) {
|
|
if (unlikely(copied != PAGE_SIZE))
|
|
copied = 0;
|
|
else
|
|
SetPageUptodate(page);
|
|
}
|
|
if (!copied)
|
|
goto unlock_out;
|
|
|
|
set_page_dirty(page);
|
|
clear_cold_data(page);
|
|
|
|
if (pos + copied > i_size_read(inode))
|
|
f2fs_i_size_write(inode, pos + copied);
|
|
unlock_out:
|
|
f2fs_put_page(page, 1);
|
|
f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
|
|
return copied;
|
|
}
|
|
|
|
static int check_direct_IO(struct inode *inode, struct iov_iter *iter,
|
|
loff_t offset)
|
|
{
|
|
unsigned blocksize_mask = inode->i_sb->s_blocksize - 1;
|
|
|
|
if (offset & blocksize_mask)
|
|
return -EINVAL;
|
|
|
|
if (iov_iter_alignment(iter) & blocksize_mask)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
struct address_space *mapping = iocb->ki_filp->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
size_t count = iov_iter_count(iter);
|
|
loff_t offset = iocb->ki_pos;
|
|
int rw = iov_iter_rw(iter);
|
|
int err;
|
|
|
|
err = check_direct_IO(inode, iter, offset);
|
|
if (err)
|
|
return err;
|
|
|
|
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
|
|
return 0;
|
|
if (test_opt(F2FS_I_SB(inode), LFS))
|
|
return 0;
|
|
|
|
trace_f2fs_direct_IO_enter(inode, offset, count, rw);
|
|
|
|
down_read(&F2FS_I(inode)->dio_rwsem[rw]);
|
|
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
|
|
up_read(&F2FS_I(inode)->dio_rwsem[rw]);
|
|
|
|
if (rw == WRITE) {
|
|
if (err > 0)
|
|
set_inode_flag(inode, FI_UPDATE_WRITE);
|
|
else if (err < 0)
|
|
f2fs_write_failed(mapping, offset + count);
|
|
}
|
|
|
|
trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
void f2fs_invalidate_page(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
|
|
|
|
if (inode->i_ino >= F2FS_ROOT_INO(sbi) &&
|
|
(offset % PAGE_SIZE || length != PAGE_SIZE))
|
|
return;
|
|
|
|
if (PageDirty(page)) {
|
|
if (inode->i_ino == F2FS_META_INO(sbi))
|
|
dec_page_count(sbi, F2FS_DIRTY_META);
|
|
else if (inode->i_ino == F2FS_NODE_INO(sbi))
|
|
dec_page_count(sbi, F2FS_DIRTY_NODES);
|
|
else
|
|
inode_dec_dirty_pages(inode);
|
|
}
|
|
|
|
/* This is atomic written page, keep Private */
|
|
if (IS_ATOMIC_WRITTEN_PAGE(page))
|
|
return;
|
|
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
}
|
|
|
|
int f2fs_release_page(struct page *page, gfp_t wait)
|
|
{
|
|
/* If this is dirty page, keep PagePrivate */
|
|
if (PageDirty(page))
|
|
return 0;
|
|
|
|
/* This is atomic written page, keep Private */
|
|
if (IS_ATOMIC_WRITTEN_PAGE(page))
|
|
return 0;
|
|
|
|
set_page_private(page, 0);
|
|
ClearPagePrivate(page);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* This was copied from __set_page_dirty_buffers which gives higher performance
|
|
* in very high speed storages. (e.g., pmem)
|
|
*/
|
|
void f2fs_set_page_dirty_nobuffers(struct page *page)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
unsigned long flags;
|
|
|
|
if (unlikely(!mapping))
|
|
return;
|
|
|
|
spin_lock(&mapping->private_lock);
|
|
lock_page_memcg(page);
|
|
SetPageDirty(page);
|
|
spin_unlock(&mapping->private_lock);
|
|
|
|
spin_lock_irqsave(&mapping->tree_lock, flags);
|
|
WARN_ON_ONCE(!PageUptodate(page));
|
|
account_page_dirtied(page, mapping);
|
|
radix_tree_tag_set(&mapping->page_tree,
|
|
page_index(page), PAGECACHE_TAG_DIRTY);
|
|
spin_unlock_irqrestore(&mapping->tree_lock, flags);
|
|
unlock_page_memcg(page);
|
|
|
|
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
|
|
return;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!PageUptodate(page))
|
|
SetPageUptodate(page);
|
|
|
|
if (f2fs_is_atomic_file(inode)) {
|
|
if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
|
|
register_inmem_page(inode, page);
|
|
return 1;
|
|
}
|
|
/*
|
|
* Previously, this page has been registered, we just
|
|
* return here.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
if (!PageDirty(page)) {
|
|
f2fs_set_page_dirty_nobuffers(page);
|
|
update_dirty_page(inode, page);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
|
|
if (f2fs_has_inline_data(inode))
|
|
return 0;
|
|
|
|
/* make sure allocating whole blocks */
|
|
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
|
|
filemap_write_and_wait(mapping);
|
|
|
|
return generic_block_bmap(mapping, block, get_data_block_bmap);
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
#include <linux/migrate.h>
|
|
|
|
int f2fs_migrate_page(struct address_space *mapping,
|
|
struct page *newpage, struct page *page, enum migrate_mode mode)
|
|
{
|
|
int rc, extra_count;
|
|
struct f2fs_inode_info *fi = F2FS_I(mapping->host);
|
|
bool atomic_written = IS_ATOMIC_WRITTEN_PAGE(page);
|
|
|
|
BUG_ON(PageWriteback(page));
|
|
|
|
/* migrating an atomic written page is safe with the inmem_lock hold */
|
|
if (atomic_written && !mutex_trylock(&fi->inmem_lock))
|
|
return -EAGAIN;
|
|
|
|
/*
|
|
* A reference is expected if PagePrivate set when move mapping,
|
|
* however F2FS breaks this for maintaining dirty page counts when
|
|
* truncating pages. So here adjusting the 'extra_count' make it work.
|
|
*/
|
|
extra_count = (atomic_written ? 1 : 0) - page_has_private(page);
|
|
rc = migrate_page_move_mapping(mapping, newpage,
|
|
page, NULL, mode, extra_count);
|
|
if (rc != MIGRATEPAGE_SUCCESS) {
|
|
if (atomic_written)
|
|
mutex_unlock(&fi->inmem_lock);
|
|
return rc;
|
|
}
|
|
|
|
if (atomic_written) {
|
|
struct inmem_pages *cur;
|
|
list_for_each_entry(cur, &fi->inmem_pages, list)
|
|
if (cur->page == page) {
|
|
cur->page = newpage;
|
|
break;
|
|
}
|
|
mutex_unlock(&fi->inmem_lock);
|
|
put_page(page);
|
|
get_page(newpage);
|
|
}
|
|
|
|
if (PagePrivate(page))
|
|
SetPagePrivate(newpage);
|
|
set_page_private(newpage, page_private(page));
|
|
|
|
migrate_page_copy(newpage, page);
|
|
|
|
return MIGRATEPAGE_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
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_page,
|
|
.releasepage = f2fs_release_page,
|
|
.direct_IO = f2fs_direct_IO,
|
|
.bmap = f2fs_bmap,
|
|
#ifdef CONFIG_MIGRATION
|
|
.migratepage = f2fs_migrate_page,
|
|
#endif
|
|
};
|