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Merge branch 'iomap-4.9-misc-fixes-1' into for-next

This commit is contained in:
Dave Chinner 2016-10-03 09:52:11 +11:00
parent 0d5b0cf246 e43c460dcd
commit b036b97050
2 changed files with 87 additions and 0 deletions
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84
fs/iomap.c
View File

@ -252,6 +252,88 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *iter,
}
EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
static struct page *
__iomap_read_page(struct inode *inode, loff_t offset)
{
struct address_space *mapping = inode->i_mapping;
struct page *page;
page = read_mapping_page(mapping, offset >> PAGE_SHIFT, NULL);
if (IS_ERR(page))
return page;
if (!PageUptodate(page)) {
put_page(page);
return ERR_PTR(-EIO);
}
return page;
}
static loff_t
iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap)
{
long status = 0;
ssize_t written = 0;
do {
struct page *page, *rpage;
unsigned long offset; /* Offset into pagecache page */
unsigned long bytes; /* Bytes to write to page */
offset = (pos & (PAGE_SIZE - 1));
bytes = min_t(unsigned long, PAGE_SIZE - offset, length);
rpage = __iomap_read_page(inode, pos);
if (IS_ERR(rpage))
return PTR_ERR(rpage);
status = iomap_write_begin(inode, pos, bytes,
AOP_FLAG_NOFS | AOP_FLAG_UNINTERRUPTIBLE,
&page, iomap);
put_page(rpage);
if (unlikely(status))
return status;
WARN_ON_ONCE(!PageUptodate(page));
status = iomap_write_end(inode, pos, bytes, bytes, page);
if (unlikely(status <= 0)) {
if (WARN_ON_ONCE(status == 0))
return -EIO;
return status;
}
cond_resched();
pos += status;
written += status;
length -= status;
balance_dirty_pages_ratelimited(inode->i_mapping);
} while (length);
return written;
}
int
iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
struct iomap_ops *ops)
{
loff_t ret;
while (len) {
ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
iomap_dirty_actor);
if (ret <= 0)
return ret;
pos += ret;
len -= ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(iomap_file_dirty);
static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
unsigned bytes, struct iomap *iomap)
{
@ -430,6 +512,8 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
if (iomap->flags & IOMAP_F_MERGED)
flags |= FIEMAP_EXTENT_MERGED;
if (iomap->flags & IOMAP_F_SHARED)
flags |= FIEMAP_EXTENT_SHARED;
return fiemap_fill_next_extent(fi, iomap->offset,
iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,

3
include/linux/iomap.h
View File

@ -22,6 +22,7 @@ struct vm_fault;
* Flags for iomap mappings:
*/
#define IOMAP_F_MERGED 0x01 /* contains multiple blocks/extents */
#define IOMAP_F_SHARED 0x02 /* block shared with another file */
/*
* Magic value for blkno:
@ -64,6 +65,8 @@ struct iomap_ops {
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
struct iomap_ops *ops);
int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
struct iomap_ops *ops);
int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
bool *did_zero, struct iomap_ops *ops);
int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,