[Cluster-devel] [PATCH v8 06/10] iomap: Add page_write_end iomap hook
Andreas Gruenbacher
agruenba at redhat.com
Mon Jun 4 19:31:19 UTC 2018
Add a page_write_end hook called when done writing to a page, for
filesystems that implement data journaling: in that case, pages are
written to the journal before being written back to their proper on-disk
locations. The new hook is bypassed for IOMAP_INLINE mappings.
Signed-off-by: Andreas Gruenbacher <agruenba at redhat.com>
---
fs/iomap.c | 58 ++++++++++++++++++++++++++++++++-----------
include/linux/iomap.h | 8 ++++++
2 files changed, 52 insertions(+), 14 deletions(-)
diff --git a/fs/iomap.c b/fs/iomap.c
index 48cd67227811..3b34c957d2fd 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -181,16 +181,22 @@ iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
static int
iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
- unsigned copied, struct page *page, struct iomap *iomap)
+ unsigned copied, struct page *page, struct iomap *iomap,
+ const struct iomap_ops *ops)
{
+ typeof(ops->page_write_end) page_write_end = ops->page_write_end;
int ret;
if (iomap->type == IOMAP_INLINE) {
iomap_write_inline_data(inode, page, iomap, pos, copied);
__generic_write_end(inode, pos, copied, page);
+ if (page_write_end)
+ page_write_end(inode, pos, copied, page, iomap);
return copied;
}
+ if (page_write_end)
+ page_write_end(inode, pos, copied, page, iomap);
ret = generic_write_end(NULL, inode->i_mapping, pos, len,
copied, page, NULL);
if (ret < len)
@@ -198,11 +204,17 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
return ret;
}
+struct iomap_write_args {
+ const struct iomap_ops *ops;
+ struct iov_iter *iter;
+};
+
static loff_t
iomap_write_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
{
- struct iov_iter *i = data;
+ struct iomap_write_args *args = data;
+ struct iov_iter *i = args->iter;
long status = 0;
ssize_t written = 0;
unsigned int flags = AOP_FLAG_NOFS;
@@ -248,7 +260,7 @@ iomap_write_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
flush_dcache_page(page);
status = iomap_write_end(inode, pos, bytes, copied, page,
- iomap);
+ iomap, args->ops);
if (unlikely(status < 0))
break;
copied = status;
@@ -285,10 +297,14 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *iter,
{
struct inode *inode = iocb->ki_filp->f_mapping->host;
loff_t pos = iocb->ki_pos, ret = 0, written = 0;
+ struct iomap_write_args args = {
+ .ops = ops,
+ .iter = iter,
+ };
while (iov_iter_count(iter)) {
ret = iomap_apply(inode, pos, iov_iter_count(iter),
- IOMAP_WRITE, ops, iter, iomap_write_actor);
+ IOMAP_WRITE, ops, &args, iomap_write_actor);
if (ret <= 0)
break;
pos += ret;
@@ -319,6 +335,7 @@ static loff_t
iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
{
+ const struct iomap_ops *ops = data;
long status = 0;
ssize_t written = 0;
@@ -342,7 +359,8 @@ iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
WARN_ON_ONCE(!PageUptodate(page));
- status = iomap_write_end(inode, pos, bytes, bytes, page, iomap);
+ status = iomap_write_end(inode, pos, bytes, bytes, page, iomap,
+ ops);
if (unlikely(status <= 0)) {
if (WARN_ON_ONCE(status == 0))
return -EIO;
@@ -368,8 +386,8 @@ iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
loff_t ret;
while (len) {
- ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
- iomap_dirty_actor);
+ ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops,
+ (void *)ops, iomap_dirty_actor);
if (ret <= 0)
return ret;
pos += ret;
@@ -381,7 +399,8 @@ iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
EXPORT_SYMBOL_GPL(iomap_file_dirty);
static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
- unsigned bytes, struct iomap *iomap)
+ unsigned bytes, const struct iomap_ops *ops,
+ struct iomap *iomap)
{
struct page *page;
int status;
@@ -394,7 +413,8 @@ static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
zero_user(page, offset, bytes);
mark_page_accessed(page);
- return iomap_write_end(inode, pos, bytes, bytes, page, iomap);
+ return iomap_write_end(inode, pos, bytes, bytes, page, iomap,
+ ops);
}
static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
@@ -407,11 +427,16 @@ static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
offset, bytes);
}
+struct iomap_zero_range_args {
+ const struct iomap_ops *ops;
+ bool *did_zero;
+};
+
static loff_t
iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
void *data, struct iomap *iomap)
{
- bool *did_zero = data;
+ struct iomap_zero_range_args *args = data;
loff_t written = 0;
int status;
@@ -428,15 +453,16 @@ iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
if (IS_DAX(inode))
status = iomap_dax_zero(pos, offset, bytes, iomap);
else
- status = iomap_zero(inode, pos, offset, bytes, iomap);
+ status = iomap_zero(inode, pos, offset, bytes,
+ args->ops, iomap);
if (status < 0)
return status;
pos += bytes;
count -= bytes;
written += bytes;
- if (did_zero)
- *did_zero = true;
+ if (args->did_zero)
+ *args->did_zero = true;
} while (count > 0);
return written;
@@ -446,11 +472,15 @@ int
iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero,
const struct iomap_ops *ops)
{
+ struct iomap_zero_range_args args = {
+ .ops = ops,
+ .did_zero = did_zero,
+ };
loff_t ret;
while (len > 0) {
ret = iomap_apply(inode, pos, len, IOMAP_ZERO,
- ops, did_zero, iomap_zero_range_actor);
+ ops, &args, iomap_zero_range_actor);
if (ret <= 0)
return ret;
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index c61113c71a60..ac7f1b2c1cbe 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -8,6 +8,7 @@ struct fiemap_extent_info;
struct inode;
struct iov_iter;
struct kiocb;
+struct page;
struct vm_area_struct;
struct vm_fault;
@@ -71,6 +72,13 @@ struct iomap_ops {
int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
unsigned flags, struct iomap *iomap);
+ /*
+ * Called when done writing to a page (optional; skipped for
+ * IOMAP_INLINE mappings).
+ */
+ void (*page_write_end)(struct inode *inode, loff_t pos, unsigned copied,
+ struct page *page, struct iomap *iomap);
+
/*
* Commit and/or unreserve space previous allocated using iomap_begin.
* Written indicates the length of the successful write operation which
--
2.17.0
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