Merge branches 'for-3.18/always-poll-quirk', 'for-3.18/logitech', 'for-3.18/picolcd...

[firefly-linux-kernel-4.4.55.git] / fs / ceph / file.c

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index fec9ddcf1528a8cf009ff371f4534c4da5e28fa5..2eb02f80a0ab05de9071bc5d076f6c8fe952cbf5 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -423,6 +423,9 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
        dout("sync_read on file %p %llu~%u %s\n", file, off,
             (unsigned)len,
             (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
+
+       if (!len)
+               return 0;
        /*
         * flush any page cache pages in this range.  this
         * will make concurrent normal and sync io slow,
@@ -534,7 +537,7 @@ static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
  * objects, rollback on failure, etc.)
  */
 static ssize_t
-ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from)
+ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
 {
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
@@ -550,7 +553,6 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from)
        int check_caps = 0;
        int ret;
        struct timespec mtime = CURRENT_TIME;
-       loff_t pos = iocb->ki_pos;
        size_t count = iov_iter_count(from);
 
        if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
@@ -649,7 +651,8 @@ ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from)
  * correct atomic write, we should e.g. take write locks on all
  * objects, rollback on failure, etc.)
  */
-static ssize_t ceph_sync_write(struct kiocb *iocb, struct iov_iter *from)
+static ssize_t
+ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
 {
        struct file *file = iocb->ki_filp;
        struct inode *inode = file_inode(file);
@@ -666,7 +669,6 @@ static ssize_t ceph_sync_write(struct kiocb *iocb, struct iov_iter *from)
        int check_caps = 0;
        int ret;
        struct timespec mtime = CURRENT_TIME;
-       loff_t pos = iocb->ki_pos;
        size_t count = iov_iter_count(from);
 
        if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
@@ -921,9 +923,9 @@ retry_snap:
                /* we might need to revert back to that point */
                data = *from;
                if (file->f_flags & O_DIRECT)
-                       written = ceph_sync_direct_write(iocb, &data);
+                       written = ceph_sync_direct_write(iocb, &data, pos);
                else
-                       written = ceph_sync_write(iocb, &data);
+                       written = ceph_sync_write(iocb, &data, pos);
                if (written == -EOLDSNAPC) {
                        dout("aio_write %p %llx.%llx %llu~%u"
                                "got EOLDSNAPC, retrying\n",