/* * fs/f2fs/data.c * * Copyright (c) 2012 Samsung Electronics Co., Ltd. * http://www.samsung.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/fs.h> #include <linux/f2fs_fs.h> #include <linux/buffer_head.h> #include <linux/mpage.h> #include <linux/writeback.h> #include <linux/backing-dev.h> #include <linux/pagevec.h> #include <linux/blkdev.h> #include <linux/bio.h> #include <linux/prefetch.h> #include <linux/uio.h> #include <linux/mm.h> #include <linux/memcontrol.h> #include <linux/cleancache.h> #include "f2fs.h" #include "node.h" #include "segment.h" #include "trace.h" #include <trace/events/f2fs.h> static bool __is_cp_guaranteed(struct page *page) { struct address_space *mapping = page->mapping; struct inode *inode; struct f2fs_sb_info *sbi; if (!mapping) return false; inode = mapping->host; sbi = F2FS_I_SB(inode); if (inode->i_ino == F2FS_META_INO(sbi) || inode->i_ino == F2FS_NODE_INO(sbi) || S_ISDIR(inode->i_mode) || is_cold_data(page)) return true; return false; } static void f2fs_read_end_io(struct bio *bio) { struct bio_vec *bvec; int i; #ifdef CONFIG_F2FS_FAULT_INJECTION if (time_to_inject(F2FS_P_SB(bio->bi_io_vec->bv_page), FAULT_IO)) bio->bi_error = -EIO; #endif if (f2fs_bio_encrypted(bio)) { if (bio->bi_error) { fscrypt_release_ctx(bio->bi_private); } else { fscrypt_decrypt_bio_pages(bio->bi_private, bio); return; } } bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; if (!bio->bi_error) { if (!PageUptodate(page)) SetPageUptodate(page); } else { ClearPageUptodate(page); SetPageError(page); } unlock_page(page); } bio_put(bio); } static void f2fs_write_end_io(struct bio *bio) { struct f2fs_sb_info *sbi = bio->bi_private; struct bio_vec *bvec; int i; bio_for_each_segment_all(bvec, bio, i) { struct page *page = bvec->bv_page; enum count_type type = WB_DATA_TYPE(page); fscrypt_pullback_bio_page(&page, true); if (unlikely(bio->bi_error)) { mapping_set_error(page->mapping, -EIO); f2fs_stop_checkpoint(sbi, true); } dec_page_count(sbi, type); clear_cold_data(page); end_page_writeback(page); } if (!get_pages(sbi, F2FS_WB_CP_DATA) && wq_has_sleeper(&sbi->cp_wait)) wake_up(&sbi->cp_wait); bio_put(bio); } /* * Return true, if pre_bio's bdev is same as its target device. */ struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi, block_t blk_addr, struct bio *bio) { struct block_device *bdev = sbi->sb->s_bdev; int i; for (i = 0; i < sbi->s_ndevs; i++) { if (FDEV(i).start_blk <= blk_addr && FDEV(i).end_blk >= blk_addr) { blk_addr -= FDEV(i).start_blk; bdev = FDEV(i).bdev; break; } } if (bio) { bio->bi_bdev = bdev; bio->bi_iter.bi_sector = SECTOR_FROM_BLOCK(blk_addr); } return bdev; } int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr) { int i; for (i = 0; i < sbi->s_ndevs; i++) if (FDEV(i).start_blk <= blkaddr && FDEV(i).end_blk >= blkaddr) return i; return 0; } static bool __same_bdev(struct f2fs_sb_info *sbi, block_t blk_addr, struct bio *bio) { return f2fs_target_device(sbi, blk_addr, NULL) == bio->bi_bdev; } /* * Low-level block read/write IO operations. */ static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr, int npages, bool is_read) { struct bio *bio; bio = f2fs_bio_alloc(npages); f2fs_target_device(sbi, blk_addr, bio); bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io; bio->bi_private = is_read ? NULL : sbi; return bio; } static inline void __submit_bio(struct f2fs_sb_info *sbi, struct bio *bio, enum page_type type) { if (!is_read_io(bio_op(bio))) { if (f2fs_sb_mounted_blkzoned(sbi->sb) && current->plug && (type == DATA || type == NODE)) blk_finish_plug(current->plug); } submit_bio(bio); } static void __submit_merged_bio(struct f2fs_bio_info *io) { struct f2fs_io_info *fio = &io->fio; if (!io->bio) return; if (is_read_io(fio->op)) trace_f2fs_submit_read_bio(io->sbi->sb, fio, io->bio); else trace_f2fs_submit_write_bio(io->sbi->sb, fio, io->bio); bio_set_op_attrs(io->bio, fio->op, fio->op_flags); __submit_bio(io->sbi, io->bio, fio->type); io->bio = NULL; } static bool __has_merged_page(struct f2fs_bio_info *io, struct inode *inode, struct page *page, nid_t ino) { struct bio_vec *bvec; struct page *target; int i; if (!io->bio) return false; if (!inode && !page && !ino) return true; bio_for_each_segment_all(bvec, io->bio, i) { if (bvec->bv_page->mapping) target = bvec->bv_page; else target = fscrypt_control_page(bvec->bv_page); if (inode && inode == target->mapping->host) return true; if (page && page == target) return true; if (ino && ino == ino_of_node(target)) return true; } return false; } static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode, struct page *page, nid_t ino, enum page_type type) { enum page_type btype = PAGE_TYPE_OF_BIO(type); struct f2fs_bio_info *io = &sbi->write_io[btype]; bool ret; down_read(&io->io_rwsem); ret = __has_merged_page(io, inode, page, ino); up_read(&io->io_rwsem); return ret; } static void __f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, struct inode *inode, struct page *page, nid_t ino, enum page_type type, int rw) { enum page_type btype = PAGE_TYPE_OF_BIO(type); struct f2fs_bio_info *io; io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype]; down_write(&io->io_rwsem); if (!__has_merged_page(io, inode, page, ino)) goto out; /* change META to META_FLUSH in the checkpoint procedure */ if (type >= META_FLUSH) { io->fio.type = META_FLUSH; io->fio.op = REQ_OP_WRITE; io->fio.op_flags = REQ_PREFLUSH | REQ_META | REQ_PRIO; if (!test_opt(sbi, NOBARRIER)) io->fio.op_flags |= REQ_FUA; } __submit_merged_bio(io); out: up_write(&io->io_rwsem); } void f2fs_submit_merged_bio(struct f2fs_sb_info *sbi, enum page_type type, int rw) { __f2fs_submit_merged_bio(sbi, NULL, NULL, 0, type, rw); } void f2fs_submit_merged_bio_cond(struct f2fs_sb_info *sbi, struct inode *inode, struct page *page, nid_t ino, enum page_type type, int rw) { if (has_merged_page(sbi, inode, page, ino, type)) __f2fs_submit_merged_bio(sbi, inode, page, ino, type, rw); } void f2fs_flush_merged_bios(struct f2fs_sb_info *sbi) { f2fs_submit_merged_bio(sbi, DATA, WRITE); f2fs_submit_merged_bio(sbi, NODE, WRITE); f2fs_submit_merged_bio(sbi, META, WRITE); } /* * Fill the locked page with data located in the block address. * Return unlocked page. */ int f2fs_submit_page_bio(struct f2fs_io_info *fio) { struct bio *bio; struct page *page = fio->encrypted_page ? fio->encrypted_page : fio->page; trace_f2fs_submit_page_bio(page, fio); f2fs_trace_ios(fio, 0); /* Allocate a new bio */ bio = __bio_alloc(fio->sbi, fio->new_blkaddr, 1, is_read_io(fio->op)); if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { bio_put(bio); return -EFAULT; } bio_set_op_attrs(bio, fio->op, fio->op_flags); __submit_bio(fio->sbi, bio, fio->type); return 0; } void f2fs_submit_page_mbio(struct f2fs_io_info *fio) { struct f2fs_sb_info *sbi = fio->sbi; enum page_type btype = PAGE_TYPE_OF_BIO(fio->type); struct f2fs_bio_info *io; bool is_read = is_read_io(fio->op); struct page *bio_page; io = is_read ? &sbi->read_io : &sbi->write_io[btype]; if (fio->old_blkaddr != NEW_ADDR) verify_block_addr(sbi, fio->old_blkaddr); verify_block_addr(sbi, fio->new_blkaddr); bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page; if (!is_read) inc_page_count(sbi, WB_DATA_TYPE(bio_page)); down_write(&io->io_rwsem); if (io->bio && (io->last_block_in_bio != fio->new_blkaddr - 1 || (io->fio.op != fio->op || io->fio.op_flags != fio->op_flags) || !__same_bdev(sbi, fio->new_blkaddr, io->bio))) __submit_merged_bio(io); alloc_new: if (io->bio == NULL) { io->bio = __bio_alloc(sbi, fio->new_blkaddr, BIO_MAX_PAGES, is_read); io->fio = *fio; } if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) { __submit_merged_bio(io); goto alloc_new; } io->last_block_in_bio = fio->new_blkaddr; f2fs_trace_ios(fio, 0); up_write(&io->io_rwsem); trace_f2fs_submit_page_mbio(fio->page, fio); } static void __set_data_blkaddr(struct dnode_of_data *dn) { struct f2fs_node *rn = F2FS_NODE(dn->node_page); __le32 *addr_array; /* Get physical address of data block */ addr_array = blkaddr_in_node(rn); addr_array[dn->ofs_in_node] = cpu_to_le32(dn->data_blkaddr); } /* * Lock ordering for the change of data block address: * ->data_page * ->node_page * update block addresses in the node page */ void set_data_blkaddr(struct dnode_of_data *dn) { f2fs_wait_on_page_writeback(dn->node_page, NODE, true); __set_data_blkaddr(dn); if (set_page_dirty(dn->node_page)) dn->node_changed = true; } void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr) { dn->data_blkaddr = blkaddr; set_data_blkaddr(dn); f2fs_update_extent_cache(dn); } /* dn->ofs_in_node will be returned with up-to-date last block pointer */ int reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count) { struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode); if (!count) return 0; if (unlikely(is_inode_flag_set(dn->inode, FI_NO_ALLOC))) return -EPERM; if (unlikely(!inc_valid_block_count(sbi, dn->inode, &count))) return -ENOSPC; trace_f2fs_reserve_new_blocks(dn->inode, dn->nid, dn->ofs_in_node, count); f2fs_wait_on_page_writeback(dn->node_page, NODE, true); for (; count > 0; dn->ofs_in_node++) { block_t blkaddr = datablock_addr(dn->node_page, dn->ofs_in_node); if (blkaddr == NULL_ADDR) { dn->data_blkaddr = NEW_ADDR; __set_data_blkaddr(dn); count--; } } if (set_page_dirty(dn->node_page)) dn->node_changed = true; return 0; } /* Should keep dn->ofs_in_node unchanged */ int reserve_new_block(struct dnode_of_data *dn) { unsigned int ofs_in_node = dn->ofs_in_node; int ret; ret = reserve_new_blocks(dn, 1); dn->ofs_in_node = ofs_in_node; return ret; } int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index) { bool need_put = dn->inode_page ? false : true; int err; err = get_dnode_of_data(dn, index, ALLOC_NODE); if (err) return err; if (dn->data_blkaddr == NULL_ADDR) err = reserve_new_block(dn); if (err || need_put) f2fs_put_dnode(dn); return err; } int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index) { struct extent_info ei; struct inode *inode = dn->inode; if (f2fs_lookup_extent_cache(inode, index, &ei)) { dn->data_blkaddr = ei.blk + index - ei.fofs; return 0; } return f2fs_reserve_block(dn, index); } struct page *get_read_data_page(struct inode *inode, pgoff_t index, int op_flags, bool for_write) { struct address_space *mapping = inode->i_mapping; struct dnode_of_data dn; struct page *page; struct extent_info ei; int err; struct f2fs_io_info fio = { .sbi = F2FS_I_SB(inode), .type = DATA, .op = REQ_OP_READ, .op_flags = op_flags, .encrypted_page = NULL, }; if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) return read_mapping_page(mapping, index, NULL); page = f2fs_grab_cache_page(mapping, index, for_write); if (!page) return ERR_PTR(-ENOMEM); if (f2fs_lookup_extent_cache(inode, index, &ei)) { dn.data_blkaddr = ei.blk + index - ei.fofs; goto got_it; } set_new_dnode(&dn, inode, NULL, NULL, 0); err = get_dnode_of_data(&dn, index, LOOKUP_NODE); if (err) goto put_err; f2fs_put_dnode(&dn); if (unlikely(dn.data_blkaddr == NULL_ADDR)) { err = -ENOENT; goto put_err; } got_it: if (PageUptodate(page)) { unlock_page(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_SIZE); if (!PageUptodate(page)) SetPageUptodate(page); unlock_page(page); return page; } fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr; fio.page = page; err = f2fs_submit_page_bio(&fio); if (err) goto put_err; return page; put_err: f2fs_put_page(page, 1); return ERR_PTR(err); } struct page *find_data_page(struct inode *inode, pgoff_t index) { struct address_space *mapping = inode->i_mapping; struct page *page; page = find_get_page(mapping, index); if (page && PageUptodate(page)) return page; f2fs_put_page(page, 0); page = get_read_data_page(inode, index, 0, false); if (IS_ERR(page)) return page; if (PageUptodate(page)) 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, 0, 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; 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); allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr, &sum, CURSEG_WARM_DATA); 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; } static inline bool __force_buffered_io(struct inode *inode, int rw) { return ((f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) || (rw == WRITE && test_opt(F2FS_I_SB(inode), LFS)) || F2FS_I_SB(inode)->s_ndevs); } int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) { struct inode *inode = file_inode(iocb->ki_filp); struct f2fs_map_blocks map; int err = 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) { err = f2fs_convert_inline_inode(inode); if (err) return err; return f2fs_map_blocks(inode, &map, 1, __force_buffered_io(inode, WRITE) ? F2FS_GET_BLOCK_PRE_AIO : F2FS_GET_BLOCK_PRE_DIO); } if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA) { err = f2fs_convert_inline_inode(inode); if (err) return err; } if (!f2fs_has_inline_data(inode)) return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO); return err; } /* * 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; 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; last_ofs_in_node = 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); } 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; 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, dn.node_changed); } goto next_dnode; sync_out: f2fs_put_dnode(&dn); unlock_out: if (create) { f2fs_unlock_op(sbi); f2fs_balance_fs(sbi, dn.node_changed); } 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 err; map.m_lblk = iblock; map.m_len = bh->b_size >> inode->i_blkbits; map.m_next_pgofs = next_pgofs; err = f2fs_map_blocks(inode, &map, create, flag); if (!err) { 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 err; } 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; 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); 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; if (blk_to_logical(inode, start_blk) < blk_to_logical(inode, F2FS_I_SB(inode)->max_file_blocks)) goto prep_next; 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 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); } f2fs_target_device(sbi, blkaddr, bio); 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 || !__same_bdev(F2FS_I_SB(inode), block_nr, bio))) { 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: 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_to_write_flags(wbc), .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; 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); if (!err) return AOP_WRITEPAGE_ACTIVATE; 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)) { /* * keep nr_to_write, since vfs uses this to * get # of written pages. */ if (ret == AOP_WRITEPAGE_ACTIVATE) { unlock_page(page); ret = 0; continue; } 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->bi_opf = REQ_OP_READ; 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); 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 (__force_buffered_io(inode, rw)) 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); remove_dirty_inode(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 };