On 2021/2/16 下午9:11, David Sterba wrote:
On Mon, Feb 08, 2021 at 01:09:21AM +0800, Shiyang Ruan wrote:
We replace the existing entry to the newly allocated one
in case of CoW. Also, we mark the entry as PAGECACHE_TAG_TOWRITE
so writeback marks this entry as writeprotected. This
helps us snapshots so new write pagefaults after snapshots
trigger a CoW.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxxxxx>
---
fs/dax.c | 31 +++++++++++++++++++++++--------
1 file changed, 23 insertions(+), 8 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index b2195cbdf2dc..29698a3d2e37 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -722,6 +722,9 @@ static int copy_cow_page_dax(struct block_device *bdev, struct dax_device *dax_d
return 0;
}
+#define DAX_IF_DIRTY (1ULL << 0)
+#define DAX_IF_COW (1ULL << 1)
The constants are ULL, but I see other flags only 'unsigned long'
+
/*
* By this point grab_mapping_entry() has ensured that we have a locked entry
* of the appropriate size so we don't have to worry about downgrading PMDs to
@@ -731,14 +734,16 @@ static int copy_cow_page_dax(struct block_device *bdev, struct dax_device *dax_d
*/
static void *dax_insert_entry(struct xa_state *xas,
struct address_space *mapping, struct vm_fault *vmf,
- void *entry, pfn_t pfn, unsigned long flags, bool dirty)
+ void *entry, pfn_t pfn, unsigned long flags, bool insert_flags)
insert_flags is bool
{
void *new_entry = dax_make_entry(pfn, flags);
+ bool dirty = insert_flags & DAX_IF_DIRTY;
"insert_flags & DAX_IF_DIRTY" is "bool & ULL", this can't be right
This is a mistake caused by rebasing my old version patchset. Thanks
for pointing out. I'll fix this in next version.
+ bool cow = insert_flags & DAX_IF_COW;
Same
if (dirty)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
- if (dax_is_zero_entry(entry) && !(flags & DAX_ZERO_PAGE)) {
+ if (cow || (dax_is_zero_entry(entry) && !(flags & DAX_ZERO_PAGE))) {
unsigned long index = xas->xa_index;
/* we are replacing a zero page with block mapping */
if (dax_is_pmd_entry(entry))
@@ -750,7 +755,7 @@ static void *dax_insert_entry(struct xa_state *xas,
xas_reset(xas);
xas_lock_irq(xas);
- if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
+ if (cow || dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
void *old;
dax_disassociate_entry(entry, mapping, false);
@@ -774,6 +779,9 @@ static void *dax_insert_entry(struct xa_state *xas,
if (dirty)
xas_set_mark(xas, PAGECACHE_TAG_DIRTY);
+ if (cow)
+ xas_set_mark(xas, PAGECACHE_TAG_TOWRITE);
+
xas_unlock_irq(xas);
return entry;
}
@@ -1319,6 +1327,7 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
void *entry;
pfn_t pfn;
void *kaddr;
+ unsigned long insert_flags = 0;
trace_dax_pte_fault(inode, vmf, ret);
/*
@@ -1444,8 +1453,10 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
goto finish_iomap;
case IOMAP_UNWRITTEN:
- if (write && iomap.flags & IOMAP_F_SHARED)
+ if (write && (iomap.flags & IOMAP_F_SHARED)) {
+ insert_flags |= DAX_IF_COW;
Here's an example of 'unsigned long = unsigned long long', though it'll
work, it would be better to unify all the types.
Yes, I'll fix it.
--
Thanks,
Ruan Shiyang.
goto cow;
+ }
fallthrough;
case IOMAP_HOLE:
if (!write) {
@@ -1555,6 +1566,7 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
int error;
pfn_t pfn;
void *kaddr;
+ unsigned long insert_flags = 0;
/*
* Check whether offset isn't beyond end of file now. Caller is
@@ -1670,14 +1682,17 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
result = vmf_insert_pfn_pmd(vmf, pfn, write);
break;
case IOMAP_UNWRITTEN:
- if (write && iomap.flags & IOMAP_F_SHARED)
+ if (write && (iomap.flags & IOMAP_F_SHARED)) {
+ insert_flags |= DAX_IF_COW;
goto cow;
+ }
fallthrough;
case IOMAP_HOLE:
- if (WARN_ON_ONCE(write))
+ if (!write) {
+ result = dax_pmd_load_hole(&xas, vmf, &iomap, &entry);
break;
- result = dax_pmd_load_hole(&xas, vmf, &iomap, &entry);
- break;
+ }
+ fallthrough;
default:
WARN_ON_ONCE(1);
break;
--
2.30.0
