diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-09-21 08:58:42 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2020-09-21 08:59:27 -0700 |
| commit | 81ee8e52a71c712dbe04994f1430cb4c88b87ad6 (patch) | |
| tree | 37eb6d637a39ee3bbf679e4ec182aeeab9b3c4af /fs/dax.c | |
| parent | e25ba8cbfd16bb10df8d90a138c743676fb8ee40 (diff) | |
| download | linux-81ee8e52a71c712dbe04994f1430cb4c88b87ad6.tar.gz | |
iomap: Change calling convention for zeroing
Pass the full length to iomap_zero() and dax_iomap_zero(), and have
them return how many bytes they actually handled. This is preparatory
work for handling THP, although it looks like DAX could actually take
advantage of it if there's a larger contiguous area.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/dax.c')
| -rw-r--r-- | fs/dax.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/dax.c b/fs/dax.c index 994ab66a99071..6ad346352a8c5 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1037,18 +1037,18 @@ static vm_fault_t dax_load_hole(struct xa_state *xas, return ret; } -int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size, - struct iomap *iomap) +s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) { sector_t sector = iomap_sector(iomap, pos & PAGE_MASK); pgoff_t pgoff; long rc, id; void *kaddr; bool page_aligned = false; - + unsigned offset = offset_in_page(pos); + unsigned size = min_t(u64, PAGE_SIZE - offset, length); if (IS_ALIGNED(sector << SECTOR_SHIFT, PAGE_SIZE) && - IS_ALIGNED(size, PAGE_SIZE)) + (size == PAGE_SIZE)) page_aligned = true; rc = bdev_dax_pgoff(iomap->bdev, sector, PAGE_SIZE, &pgoff); @@ -1058,8 +1058,7 @@ int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size, id = dax_read_lock(); if (page_aligned) - rc = dax_zero_page_range(iomap->dax_dev, pgoff, - size >> PAGE_SHIFT); + rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1); else rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL); if (rc < 0) { @@ -1072,7 +1071,7 @@ int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size, dax_flush(iomap->dax_dev, kaddr + offset, size); } dax_read_unlock(id); - return 0; + return size; } static loff_t |