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dax: Introduce IOMAP_FAULT flag

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Introduce a flag telling iomap operations whether they are handling a
fault or other IO. That may influence behavior wrt inode size and
similar things.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Jan Kara 2016-11-10 10:26:50 +11:00 committed by Dave Chinner
parent 190b5caad7
commit 9484ab1bf4
3 changed files with 6 additions and 4 deletions
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4
fs/dax.c
View File

@ -1266,7 +1266,7 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
loff_t pos = (loff_t)vmf->pgoff << PAGE_SHIFT;
sector_t sector;
struct iomap iomap = { 0 };
unsigned flags = 0;
unsigned flags = IOMAP_FAULT;
int error, major = 0;
int locked_status = 0;
void *entry;
@ -1467,7 +1467,7 @@ int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address,
struct address_space *mapping = vma->vm_file->f_mapping;
unsigned long pmd_addr = address & PMD_MASK;
bool write = flags & FAULT_FLAG_WRITE;
unsigned int iomap_flags = write ? IOMAP_WRITE : 0;
unsigned int iomap_flags = (write ? IOMAP_WRITE : 0) | IOMAP_FAULT;
struct inode *inode = mapping->host;
int result = VM_FAULT_FALLBACK;
struct iomap iomap = { 0 };

5
fs/iomap.c
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@ -468,8 +468,9 @@ int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
offset = page_offset(page);
while (length > 0) {
ret = iomap_apply(inode, offset, length, IOMAP_WRITE,
ops, page, iomap_page_mkwrite_actor);
ret = iomap_apply(inode, offset, length,
IOMAP_WRITE | IOMAP_FAULT, ops, page,
iomap_page_mkwrite_actor);
if (unlikely(ret <= 0))
goto out_unlock;
offset += ret;

1
include/linux/iomap.h
View File

@ -44,6 +44,7 @@ struct iomap {
*/
#define IOMAP_WRITE (1 << 0)
#define IOMAP_ZERO (1 << 1)
#define IOMAP_FAULT (1 << 3) /* mapping for page fault */
struct iomap_ops {
/*