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| author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2016-11-08 11:33:09 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-11-08 11:33:09 +1100 |
| commit | 333ccc978e1e09af2690e459b6f97d8e91cc01fa (patch) | |
| tree | 12ad6c237dd92c3e903bb3b433257d0ea2fdfe27 /fs/dax.c | |
| parent | 11c59c92f44d9272db7655a462608658a6d95013 (diff) | |
| download | linux-333ccc978e1e09af2690e459b6f97d8e91cc01fa.tar.bz2 | |
dax: add dax_iomap_sector() helper function
To be able to correctly calculate the sector from a file position and a
struct iomap there is a complex little bit of logic that currently happens
in both dax_iomap_actor() and dax_iomap_fault(). This will need to be
repeated yet again in the DAX PMD fault handler when it is added, so break
it out into a helper function.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/dax.c')
| -rw-r--r-- | fs/dax.c | 10 |
1 files changed, 7 insertions, 3 deletions
@@ -1030,6 +1030,11 @@ int dax_truncate_page(struct inode *inode, loff_t from, get_block_t get_block) EXPORT_SYMBOL_GPL(dax_truncate_page); #ifdef CONFIG_FS_IOMAP +static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos) +{ + return iomap->blkno + (((pos & PAGE_MASK) - iomap->offset) >> 9); +} + static loff_t dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, struct iomap *iomap) @@ -1055,8 +1060,7 @@ dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, struct blk_dax_ctl dax = { 0 }; ssize_t map_len; - dax.sector = iomap->blkno + - (((pos & PAGE_MASK) - iomap->offset) >> 9); + dax.sector = dax_iomap_sector(iomap, pos); dax.size = (length + offset + PAGE_SIZE - 1) & PAGE_MASK; map_len = dax_map_atomic(iomap->bdev, &dax); if (map_len < 0) { @@ -1193,7 +1197,7 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf, goto unlock_entry; } - sector = iomap.blkno + (((pos & PAGE_MASK) - iomap.offset) >> 9); + sector = dax_iomap_sector(&iomap, pos); if (vmf->cow_page) { switch (iomap.type) { |