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authorMiklos Szeredi <mszeredi@redhat.com>2019-01-16 10:27:59 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2019-02-13 13:15:12 +0100
commit2fe93bd43264242e4568763d1b183b1cc58066ff (patch)
treed98b1b16e48a377cb9f3f4b60d13cde768dad8da /fs/fuse
parentd13937116f1e82bf508a6325111b322c30c85eb9 (diff)
downloadlinux-2fe93bd43264242e4568763d1b183b1cc58066ff.tar.bz2
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>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c52
1 files changed, 25 insertions, 27 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a59c16bd90ac..927d40dec376 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -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,