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fuse: extract fuse_find_writeback() helper 

Call this from fuse_range_is_writeback() and fuse_writepage_in_flight().

Turn a BUG_ON() into a WARN_ON() in the process.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
hifive-unleashed-5.1
Miklos Szeredi 2019-01-16 10:27:59 +01:00
parent d13937116f
commit 2fe93bd432
1 changed files with 25 additions and 27 deletions
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52
fs/fuse/file.c
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@ -329,6 +329,24 @@ u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
return (u64) v0 + ((u64) v1 << 32);
}
static struct fuse_req *fuse_find_writeback(struct fuse_inode *fi,
pgoff_t idx_from, pgoff_t idx_to)
{
struct fuse_req *req;
list_for_each_entry(req, &fi->writepages, writepages_entry) {
pgoff_t curr_index;
WARN_ON(get_fuse_inode(req->inode) != fi);
curr_index = req->misc.write.in.offset >> PAGE_SHIFT;
if (idx_from < curr_index + req->num_pages &&
curr_index <= idx_to) {
return req;
}
}
return NULL;
}
/*
* Check if any page in a range is under writeback
*
@ -340,21 +358,10 @@ static bool fuse_range_is_writeback(struct inode *inode, pgoff_t idx_from,
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_req *req;
bool found = false;
bool found;
spin_lock(&fc->lock);
list_for_each_entry(req, &fi->writepages, writepages_entry) {
pgoff_t curr_index;
BUG_ON(req->inode != inode);
curr_index = req->misc.write.in.offset >> PAGE_SHIFT;
if (idx_from < curr_index + req->num_pages &&
curr_index <= idx_to) {
found = true;
break;
}
}
found = fuse_find_writeback(fi, idx_from, idx_to);
spin_unlock(&fc->lock);
return found;
@ -1744,25 +1751,17 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
struct fuse_inode *fi = get_fuse_inode(new_req->inode);
struct fuse_req *tmp;
struct fuse_req *old_req;
bool found = false;
pgoff_t curr_index;
BUG_ON(new_req->num_pages != 0);
spin_lock(&fc->lock);
list_del(&new_req->writepages_entry);
list_for_each_entry(old_req, &fi->writepages, writepages_entry) {
BUG_ON(old_req->inode != new_req->inode);
curr_index = old_req->misc.write.in.offset >> PAGE_SHIFT;
if (curr_index <= page->index &&
page->index < curr_index + old_req->num_pages) {
found = true;
break;
}
}
if (!found) {
old_req = fuse_find_writeback(fi, page->index, page->index);
if (!old_req) {
list_add(&new_req->writepages_entry, &fi->writepages);
goto out_unlock;
spin_unlock(&fc->lock);
return false;
}
new_req->num_pages = 1;
@ -1791,10 +1790,9 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
new_req->misc.write.next = old_req->misc.write.next;
old_req->misc.write.next = new_req;
}
out_unlock:
spin_unlock(&fc->lock);
out:
return found;
return true;
}
static int fuse_writepages_fill(struct page *page,