diff options
| author | Jan Kara <jack@suse.cz> | 2016-11-10 10:26:50 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-11-10 10:26:50 +1100 |
| commit | 9484ab1bf4464faae695321dd4fa66365beda74e (patch) | |
| tree | f9fabeb09ceccf608881a9a72d0601b88cc4732b | |
| parent | 190b5caad750942c0791889b809ce04b1eede43d (diff) | |
dax: Introduce IOMAP_FAULT flag
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>
| -rw-r--r-- | fs/dax.c | 4 | ||||
| -rw-r--r-- | fs/iomap.c | 5 | ||||
| -rw-r--r-- | include/linux/iomap.h | 1 |
3 files changed, 6 insertions, 4 deletions
@@ -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 }; diff --git a/fs/iomap.c b/fs/iomap.c index 013d1d36fbbf..51a02573405e 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -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; diff --git a/include/linux/iomap.h b/include/linux/iomap.h index e63e288dee83..b9e7b8ec8c1d 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -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 { /* |