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fuse: Prepare to handle multiple pages in writeback 

The .writepages callback will issue writeback requests with more than one
page aboard. Make existing end/check code be aware of this.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Pavel Emelyanov 2013-06-29 21:42:48 +04:00 committed by Miklos Szeredi
parent adcadfa8f3
commit 385b126815
1 changed files with 16 additions and 8 deletions
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24
fs/fuse/file.c
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@ -334,7 +334,8 @@ static bool fuse_page_is_writeback(struct inode *inode, pgoff_t index)
BUG_ON(req->inode != inode);
curr_index = req->misc.write.in.offset >> PAGE_CACHE_SHIFT;
if (curr_index == index) {
if (curr_index <= index &&
index < curr_index + req->num_pages) {
found = true;
break;
}
@ -1409,7 +1410,10 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
{
__free_page(req->pages[0]);
int i;
for (i = 0; i < req->num_pages; i++)
__free_page(req->pages[i]);
fuse_file_put(req->ff, false);
}
@ -1418,11 +1422,14 @@ static void fuse_writepage_finish(struct fuse_conn *fc, struct fuse_req *req)
struct inode *inode = req->inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
int i;
list_del(&req->writepages_entry);
dec_bdi_stat(bdi, BDI_WRITEBACK);
dec_zone_page_state(req->pages[0], NR_WRITEBACK_TEMP);
bdi_writeout_inc(bdi);
for (i = 0; i < req->num_pages; i++) {
dec_bdi_stat(bdi, BDI_WRITEBACK);
dec_zone_page_state(req->pages[i], NR_WRITEBACK_TEMP);
bdi_writeout_inc(bdi);
}
wake_up(&fi->page_waitq);
}
@ -1434,14 +1441,15 @@ __acquires(fc->lock)
struct fuse_inode *fi = get_fuse_inode(req->inode);
loff_t size = i_size_read(req->inode);
struct fuse_write_in *inarg = &req->misc.write.in;
__u64 data_size = req->num_pages * PAGE_CACHE_SIZE;
if (!fc->connected)
goto out_free;
if (inarg->offset + PAGE_CACHE_SIZE <= size) {
inarg->size = PAGE_CACHE_SIZE;
if (inarg->offset + data_size <= size) {
inarg->size = data_size;
} else if (inarg->offset < size) {
inarg->size = size & (PAGE_CACHE_SIZE - 1);
inarg->size = size - inarg->offset;
} else {
/* Got truncated off completely */
goto out_free;