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authorMiklos Szeredi <mszeredi@redhat.com>2021-04-14 11:40:56 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-04-14 11:40:56 +0300
commita73d47f57792dc3140348cc07271500c610b5624 (patch)
tree93ed5376d78d006c2ff827e1336d204496274310 /fs/fuse
parent4b91459ad283a7b174c7a092e31c470f217d1a31 (diff)
downloadlinux-a73d47f57792dc3140348cc07271500c610b5624.tar.xz
fuse: don't zero pages twice
All callers of fuse_short_read already set the .page_zeroing flag, so no need to do the tail zeroing again. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index eff4abaa87da..51187777c39b 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -798,21 +798,12 @@ static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read,
{
struct fuse_conn *fc = get_fuse_conn(inode);
- if (fc->writeback_cache) {
- /*
- * A hole in a file. Some data after the hole are in page cache,
- * but have not reached the client fs yet. So, the hole is not
- * present there.
- */
- int i;
- int start_idx = num_read >> PAGE_SHIFT;
- size_t off = num_read & (PAGE_SIZE - 1);
-
- for (i = start_idx; i < ap->num_pages; i++) {
- zero_user_segment(ap->pages[i], off, PAGE_SIZE);
- off = 0;
- }
- } else {
+ /*
+ * If writeback_cache is enabled, a short read means there's a hole in
+ * the file. Some data after the hole is in page cache, but has not
+ * reached the client fs yet. So the hole is not present there.
+ */
+ if (!fc->writeback_cache) {
loff_t pos = page_offset(ap->pages[0]) + num_read;
fuse_read_update_size(inode, pos, attr_ver);
}