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iomap: ignore non-shared or non-data blocks in xfs_file_dirty

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xfs_file_dirty is used to unshare reflink blocks.  Rename the function
to xfs_file_unshare to better document that purpose, and skip iomaps
that are not shared and don't need zeroing.  This will allow to simplify
the caller.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
2019-10-18 16:41:34 -07:00
committed by Darrick J. Wong
parent dcd6158d15
commit 3590c4d897
3 changed files with 13 additions and 6 deletions
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15
fs/iomap/buffered-io.c
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@@ -887,12 +887,19 @@ __iomap_read_page(struct inode *inode, loff_t offset)
}
static loff_t
iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
{
long status = 0;
ssize_t written = 0;
/* don't bother with blocks that are not shared to start with */
if (!(iomap->flags & IOMAP_F_SHARED))
return length;
/* don't bother with holes or unwritten extents */
if (iomap->type == IOMAP_HOLE || iomap->type == IOMAP_UNWRITTEN)
return length;
do {
struct page *page, *rpage;
unsigned long offset; /* Offset into pagecache page */
@@ -932,14 +939,14 @@ iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
}
int
iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
const struct iomap_ops *ops)
{
loff_t ret;
while (len) {
ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
iomap_dirty_actor);
iomap_unshare_actor);
if (ret <= 0)
return ret;
pos += ret;
@@ -948,7 +955,7 @@ iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
return 0;
}
EXPORT_SYMBOL_GPL(iomap_file_dirty);
EXPORT_SYMBOL_GPL(iomap_file_unshare);
static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
unsigned bytes, struct iomap *iomap)