From 4969c06a0d83c9c3dc50b8efcdc8eeedfce896f6 Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Mon, 1 Jul 2019 19:15:29 -0700 Subject: f2fs: support swap file w/ DIO Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++---- fs/f2fs/f2fs.h | 5 +- 2 files changed, 137 insertions(+), 10 deletions(-) (limited to 'fs/f2fs') diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 1e2d924e2ea7..6a8db4abdf5f 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -54,7 +55,7 @@ static bool __is_cp_guaranteed(struct page *page) static enum count_type __read_io_type(struct page *page) { - struct address_space *mapping = page->mapping; + struct address_space *mapping = page_file_mapping(page); if (mapping) { struct inode *inode = mapping->host; @@ -1585,7 +1586,7 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page, sector_t block_nr; int ret = 0; - block_in_file = (sector_t)page->index; + block_in_file = (sector_t)page_index(page); last_block = block_in_file + nr_pages; last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits; @@ -1618,7 +1619,8 @@ got_it: block_nr = map->m_pblk + block_in_file - map->m_lblk; SetPageMappedToDisk(page); - if (!PageUptodate(page) && !cleancache_get_page(page)) { + if (!PageUptodate(page) && (!PageSwapCache(page) && + !cleancache_get_page(page))) { SetPageUptodate(page); goto confused; } @@ -1716,7 +1718,7 @@ static int f2fs_mpage_readpages(struct address_space *mapping, prefetchw(&page->flags); list_del(&page->lru); if (add_to_page_cache_lru(page, mapping, - page->index, + page_index(page), readahead_gfp_mask(mapping))) goto next_page; } @@ -1740,7 +1742,7 @@ next_page: static int f2fs_read_data_page(struct file *file, struct page *page) { - struct inode *inode = page->mapping->host; + struct inode *inode = page_file_mapping(page)->host; int ret = -EAGAIN; trace_f2fs_readpage(page, DATA); @@ -1749,7 +1751,8 @@ static int f2fs_read_data_page(struct file *file, struct page *page) 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, false); + ret = f2fs_mpage_readpages(page_file_mapping(page), + NULL, page, 1, false); return ret; } @@ -2851,13 +2854,14 @@ int f2fs_release_page(struct page *page, gfp_t wait) static int f2fs_set_data_page_dirty(struct page *page) { - struct address_space *mapping = page->mapping; - struct inode *inode = mapping->host; + struct inode *inode = page_file_mapping(page)->host; trace_f2fs_set_page_dirty(page, DATA); if (!PageUptodate(page)) SetPageUptodate(page); + if (PageSwapCache(page)) + return __set_page_dirty_nobuffers(page); if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) { if (!IS_ATOMIC_WRITTEN_PAGE(page)) { @@ -2949,6 +2953,126 @@ int f2fs_migrate_page(struct address_space *mapping, } #endif +#ifdef CONFIG_SWAP +/* Copied from generic_swapfile_activate() to check any holes */ +static int check_swap_activate(struct file *swap_file, unsigned int max) +{ + struct address_space *mapping = swap_file->f_mapping; + struct inode *inode = mapping->host; + unsigned blocks_per_page; + unsigned long page_no; + unsigned blkbits; + sector_t probe_block; + sector_t last_block; + sector_t lowest_block = -1; + sector_t highest_block = 0; + + blkbits = inode->i_blkbits; + blocks_per_page = PAGE_SIZE >> blkbits; + + /* + * Map all the blocks into the extent list. This code doesn't try + * to be very smart. + */ + probe_block = 0; + page_no = 0; + last_block = i_size_read(inode) >> blkbits; + while ((probe_block + blocks_per_page) <= last_block && page_no < max) { + unsigned block_in_page; + sector_t first_block; + + cond_resched(); + + first_block = bmap(inode, probe_block); + if (first_block == 0) + goto bad_bmap; + + /* + * It must be PAGE_SIZE aligned on-disk + */ + if (first_block & (blocks_per_page - 1)) { + probe_block++; + goto reprobe; + } + + for (block_in_page = 1; block_in_page < blocks_per_page; + block_in_page++) { + sector_t block; + + block = bmap(inode, probe_block + block_in_page); + if (block == 0) + goto bad_bmap; + if (block != first_block + block_in_page) { + /* Discontiguity */ + probe_block++; + goto reprobe; + } + } + + first_block >>= (PAGE_SHIFT - blkbits); + if (page_no) { /* exclude the header page */ + if (first_block < lowest_block) + lowest_block = first_block; + if (first_block > highest_block) + highest_block = first_block; + } + + page_no++; + probe_block += blocks_per_page; +reprobe: + continue; + } + return 0; + +bad_bmap: + pr_err("swapon: swapfile has holes\n"); + return -EINVAL; +} + +static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file, + sector_t *span) +{ + struct inode *inode = file_inode(file); + int ret; + + if (!S_ISREG(inode->i_mode)) + return -EINVAL; + + if (f2fs_readonly(F2FS_I_SB(inode)->sb)) + return -EROFS; + + ret = f2fs_convert_inline_inode(inode); + if (ret) + return ret; + + ret = check_swap_activate(file, sis->max); + if (ret) + return ret; + + set_inode_flag(inode, FI_PIN_FILE); + f2fs_precache_extents(inode); + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); + return 0; +} + +static void f2fs_swap_deactivate(struct file *file) +{ + struct inode *inode = file_inode(file); + + clear_inode_flag(inode, FI_PIN_FILE); +} +#else +static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file, + sector_t *span) +{ + return -EOPNOTSUPP; +} + +static void f2fs_swap_deactivate(struct file *file) +{ +} +#endif + const struct address_space_operations f2fs_dblock_aops = { .readpage = f2fs_read_data_page, .readpages = f2fs_read_data_pages, @@ -2961,6 +3085,8 @@ const struct address_space_operations f2fs_dblock_aops = { .releasepage = f2fs_release_page, .direct_IO = f2fs_direct_IO, .bmap = f2fs_bmap, + .swap_activate = f2fs_swap_activate, + .swap_deactivate = f2fs_swap_deactivate, #ifdef CONFIG_MIGRATION .migratepage = f2fs_migrate_page, #endif diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 761c5a59ef77..17382da7f0bd 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1498,7 +1498,7 @@ static inline struct f2fs_sb_info *F2FS_M_SB(struct address_space *mapping) static inline struct f2fs_sb_info *F2FS_P_SB(struct page *page) { - return F2FS_M_SB(page->mapping); + return F2FS_M_SB(page_file_mapping(page)); } static inline struct f2fs_super_block *F2FS_RAW_SUPER(struct f2fs_sb_info *sbi) @@ -3683,7 +3683,8 @@ static inline bool f2fs_force_buffered_io(struct inode *inode, if (test_opt(sbi, LFS) && (rw == WRITE) && block_unaligned_IO(inode, iocb, iter)) return true; - if (is_sbi_flag_set(F2FS_I_SB(inode), SBI_CP_DISABLED)) + if (is_sbi_flag_set(F2FS_I_SB(inode), SBI_CP_DISABLED) && + !(inode->i_flags & S_SWAPFILE)) return true; return false; -- cgit v1.2.3-59-g8ed1b