This patch series converts the exfat filesystem to the iomap framework for
buffered I/O, direct I/O, and llseek (SEEK_HOLE/SEEK_DATA) support.
iozone benchmark results (4KB cluster size, -s1g -r64k, 1GB file, 64KB record size)
1 thread 4 threads
Write Read Write Read
(MB/s) (MB/s) (MB/s) (MB/s)
-----------------------------------------------------------------
exfat + iomap patch 332.7 418.1 78.6 82.4
Current exfat 278.4 415.1 42.1 38.0
-----------------------------------------------------------------
Improvement +19.5% +0.7% +86.7% +117.4%
v2:
- Replace macros with static inline functions.
- Remove noop_direct_IO.
- Consolidate read and write iomap_begin into __exfat_iomap_begin()
- Zero out stale data in straddle block beyond valid_size.
- Introduce IOMAP_F_ZERO_TAIL flag to remove exfat_iomap_put_folio().
- Select FS_IOMAP in Kconfig.
- Remove unnecessary alignment check in exfat_file_read_iter().
- Just use generic_file_llseek directly.
- Move exfat_extend_valid_size to exfat_file_write_iter().
- Use pagecache_isize_extended() to remove iomap_zero_range in
exfat_setattr().
- fix mmap write data corruption with byte-by-byte fallocate.
- Remove exfat_mkwrite_iomap_begin().
Namjae Jeon (9):
exfat: replace unsafe macros with static inline functions
exfat: add balloc parameter to exfat_map_cluster() for iomap support
exfat: add exfat_file_open()
exfat: add support for multi-cluster allocation
iomap: introduce IOMAP_F_ZERO_TAIL flag
exfat: add data_start_bytes and exfat_cluster_to_phys() helper
exfat: add iomap buffered I/O support
exfat: add iomap direct I/O support
exfat: add support for SEEK_HOLE and SEEK_DATA in llseek
fs/exfat/Kconfig | 2 +-
fs/exfat/Makefile | 2 +-
fs/exfat/balloc.c | 2 +-
fs/exfat/dir.c | 50 +++---
fs/exfat/exfat_fs.h | 140 ++++++++++++-----
fs/exfat/fatent.c | 30 ++--
fs/exfat/file.c | 253 +++++++++++++++++++++++-------
fs/exfat/inode.c | 342 ++++++-----------------------------------
fs/exfat/iomap.c | 247 +++++++++++++++++++++++++++++
fs/exfat/iomap.h | 15 ++
fs/exfat/namei.c | 28 ++--
fs/exfat/super.c | 5 +-
fs/iomap/buffered-io.c | 4 +
include/linux/iomap.h | 4 +
14 files changed, 678 insertions(+), 446 deletions(-)
create mode 100644 fs/exfat/iomap.c
create mode 100644 fs/exfat/iomap.h
--
2.25.1