Currently iomap_end() doesn't do anything for DAX page faults for both ext2
and XFS. ext2_iomap_end() just checks for a write underrun, and
xfs_file_iomap_end() checks to see if it needs to finish a delayed
allocation. However, in the future iomap_end() calls might be needed to
make sure we have balanced allocations, locks, etc. So, add calls to
iomap_end() with appropriate error handling to dax_iomap_fault().
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Suggested-by: Jan Kara <jack@xxxxxxx>
---
fs/dax.c | 31 ++++++++++++++++++++++++++++---
1 file changed, 28 insertions(+), 3 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 7689ab0..5e8febe 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1187,7 +1187,7 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
goto unlock_entry;
if (WARN_ON_ONCE(iomap.offset + iomap.length < pos + PAGE_SIZE)) {
error = -EIO; /* fs corruption? */
- goto unlock_entry;
+ goto finish_iomap;
}
sector = dax_iomap_sector(&iomap, pos);
@@ -1209,7 +1209,14 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
}
if (error)
- goto unlock_entry;
+ goto finish_iomap;
+
+ if (ops->iomap_end) {
+ error = ops->iomap_end(inode, pos, PAGE_SIZE,
+ PAGE_SIZE, flags, &iomap);
+ if (error)
+ goto unlock_entry;
+ }
if (!radix_tree_exceptional_entry(entry)) {
vmf->page = entry;
return VM_FAULT_LOCKED;
@@ -1230,8 +1237,15 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
break;
case IOMAP_UNWRITTEN:
case IOMAP_HOLE:
- if (!(vmf->flags & FAULT_FLAG_WRITE))
+ if (!(vmf->flags & FAULT_FLAG_WRITE)) {
+ if (ops->iomap_end) {
+ error = ops->iomap_end(inode, pos, PAGE_SIZE,
+ PAGE_SIZE, flags, &iomap);
+ if (error)
+ goto unlock_entry;
+ }
return dax_load_hole(mapping, entry, vmf);
+ }
/*FALLTHRU*/
default:
WARN_ON_ONCE(1);
@@ -1239,6 +1253,17 @@ int dax_iomap_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
break;
}
+ finish_iomap:
+ if (ops->iomap_end) {
+ if (error) {
+ /* keep previous error */
+ ops->iomap_end(inode, pos, PAGE_SIZE, PAGE_SIZE, flags,
+ &iomap);
+ } else {
+ error = ops->iomap_end(inode, pos, PAGE_SIZE,
+ PAGE_SIZE, flags, &iomap);
+ }
+ }
unlock_entry:
put_locked_mapping_entry(mapping, vmf->pgoff, entry);
out:
--
2.7.4
--
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