diff options
author | Chao Yu <yuchao0@huawei.com> | 2018-11-13 14:33:45 +0800 |
---|---|---|
committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-11-26 15:53:56 -0800 |
commit | f9d6d0597698c0d27ac54c7dca459a7a1b931315 (patch) | |
tree | 0e0ca8121663cb118fd4114126d0bafa8903982b /fs/f2fs | |
parent | fef4129ec2e691a8411584c8bd126a35d0870298 (diff) | |
download | linux-f9d6d0597698c0d27ac54c7dca459a7a1b931315.tar.bz2 |
f2fs: fix out-place-update DIO write
In get_more_blocks(), we may override @create as below code:
create = dio->op == REQ_OP_WRITE;
if (dio->flags & DIO_SKIP_HOLES) {
if (fs_startblk <= ((i_size_read(dio->inode) - 1) >>
i_blkbits))
create = 0;
}
But in f2fs_map_blocks(), we only trigger f2fs_balance_fs() if @create
is 1, so in LFS mode, dio overwrite under LFS mode can easily run out
of free segments, result in below panic.
Call Trace:
allocate_segment_by_default+0xa8/0x270 [f2fs]
f2fs_allocate_data_block+0x1ea/0x5c0 [f2fs]
__allocate_data_block+0x306/0x480 [f2fs]
f2fs_map_blocks+0x6f6/0x920 [f2fs]
__get_data_block+0x4f/0xb0 [f2fs]
get_data_block_dio_write+0x50/0x60 [f2fs]
do_blockdev_direct_IO+0xcd5/0x21e0
__blockdev_direct_IO+0x3a/0x3c
f2fs_direct_IO+0x1ff/0x4a0 [f2fs]
generic_file_direct_write+0xd9/0x160
__generic_file_write_iter+0xbb/0x1e0
f2fs_file_write_iter+0xaf/0x220 [f2fs]
__vfs_write+0xd0/0x130
vfs_write+0xb2/0x1b0
SyS_pwrite64+0x69/0xa0
? vtime_user_exit+0x29/0x70
do_syscall_64+0x6e/0x160
entry_SYSCALL64_slow_path+0x25/0x25
RIP: new_curseg+0x36f/0x380 [f2fs] RSP: ffffac570393f7a8
So this patch introduces a parameter map.m_may_create to indicate that
f2fs_map_blocks() is called from write or read path, which can give the
right hint to let f2fs_map_blocks() trigger OPU allocation and call
f2fs_balanc_fs() correctly.
BTW, it disables physical address preallocation for direct IO in
f2fs_preallocate_blocks, which is redundant to OPU allocation of
f2fs_map_blocks.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r-- | fs/f2fs/data.c | 42 | ||||
-rw-r--r-- | fs/f2fs/f2fs.h | 1 | ||||
-rw-r--r-- | fs/f2fs/file.c | 3 |
3 files changed, 32 insertions, 14 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 1d15535e3b42..aa8843a3e5bc 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -957,6 +957,9 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) return err; } + if (direct_io && allow_outplace_dio(inode, iocb, from)) + return 0; + if (is_inode_flag_set(inode, FI_NO_PREALLOC)) return 0; @@ -970,6 +973,7 @@ int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from) map.m_next_pgofs = NULL; map.m_next_extent = NULL; map.m_seg_type = NO_CHECK_TYPE; + map.m_may_create = true; if (direct_io) { map.m_seg_type = f2fs_rw_hint_to_seg_type(iocb->ki_hint); @@ -1028,7 +1032,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, 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; + int mode = map->m_may_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; @@ -1062,7 +1066,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, } next_dnode: - if (create) + if (map->m_may_create) __do_map_lock(sbi, flag, true); /* When reading holes, we need its node page */ @@ -1099,8 +1103,8 @@ next_block: if (is_valid_data_blkaddr(sbi, blkaddr)) { /* use out-place-update for driect IO under LFS mode */ - if (test_opt(sbi, LFS) && create && - flag == F2FS_GET_BLOCK_DIO) { + if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO && + map->m_may_create) { err = __allocate_data_block(&dn, map->m_seg_type); if (!err) set_inode_flag(inode, FI_APPEND_WRITE); @@ -1209,7 +1213,7 @@ skip: f2fs_put_dnode(&dn); - if (create) { + if (map->m_may_create) { __do_map_lock(sbi, flag, false); f2fs_balance_fs(sbi, dn.node_changed); } @@ -1235,7 +1239,7 @@ sync_out: } f2fs_put_dnode(&dn); unlock_out: - if (create) { + if (map->m_may_create) { __do_map_lock(sbi, flag, false); f2fs_balance_fs(sbi, dn.node_changed); } @@ -1271,7 +1275,7 @@ bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len) static int __get_data_block(struct inode *inode, sector_t iblock, struct buffer_head *bh, int create, int flag, - pgoff_t *next_pgofs, int seg_type) + pgoff_t *next_pgofs, int seg_type, bool may_write) { struct f2fs_map_blocks map; int err; @@ -1281,6 +1285,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock, map.m_next_pgofs = next_pgofs; map.m_next_extent = NULL; map.m_seg_type = seg_type; + map.m_may_create = may_write; err = f2fs_map_blocks(inode, &map, create, flag); if (!err) { @@ -1297,16 +1302,25 @@ static int get_data_block(struct inode *inode, sector_t iblock, { return __get_data_block(inode, iblock, bh_result, create, flag, next_pgofs, - NO_CHECK_TYPE); + NO_CHECK_TYPE, create); +} + +static int get_data_block_dio_write(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, + f2fs_rw_hint_to_seg_type(inode->i_write_hint), + true); } 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, - f2fs_rw_hint_to_seg_type( - inode->i_write_hint)); + F2FS_GET_BLOCK_DIO, NULL, + f2fs_rw_hint_to_seg_type(inode->i_write_hint), + false); } static int get_data_block_bmap(struct inode *inode, sector_t iblock, @@ -1318,7 +1332,7 @@ static int get_data_block_bmap(struct inode *inode, sector_t iblock, return __get_data_block(inode, iblock, bh_result, create, F2FS_GET_BLOCK_BMAP, NULL, - NO_CHECK_TYPE); + NO_CHECK_TYPE, create); } static inline sector_t logical_to_blk(struct inode *inode, loff_t offset) @@ -1525,6 +1539,7 @@ static int f2fs_mpage_readpages(struct address_space *mapping, map.m_next_pgofs = NULL; map.m_next_extent = NULL; map.m_seg_type = NO_CHECK_TYPE; + map.m_may_create = false; for (; nr_pages; nr_pages--) { if (pages) { @@ -2642,7 +2657,8 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) } err = __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, - iter, get_data_block_dio, NULL, f2fs_dio_submit_bio, + iter, rw == WRITE ? get_data_block_dio_write : + get_data_block_dio, NULL, f2fs_dio_submit_bio, DIO_LOCKING | DIO_SKIP_HOLES); if (do_opu) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index df10394bd806..26ad1de8641c 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -602,6 +602,7 @@ struct f2fs_map_blocks { pgoff_t *m_next_pgofs; /* point next possible non-hole pgofs */ pgoff_t *m_next_extent; /* point to next possible extent */ int m_seg_type; + bool m_may_create; /* indicate it is from write path */ }; /* for flag in get_data_block */ diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 439d340dbe1a..327183000b1c 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1499,7 +1499,8 @@ static int expand_inode_data(struct inode *inode, loff_t offset, { struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct f2fs_map_blocks map = { .m_next_pgofs = NULL, - .m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE }; + .m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE, + .m_may_create = true }; pgoff_t pg_end; loff_t new_size = i_size_read(inode); loff_t off_end; |