Merge branch 'linux-linaro-lsk' into linux-linaro-lsk-android

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

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 656e169074305f12d34859ca07ee710c4c1a954d..5de16f5ac7e9a0d95c34e27eb07b55b17a745658 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -313,9 +313,9 @@ static int striped_read(struct inode *inode,
 {
        struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
        struct ceph_inode_info *ci = ceph_inode(inode);
-       u64 pos, this_len;
+       u64 pos, this_len, left;
        int io_align, page_align;
-       int left, pages_left;
+       int pages_left;
        int read;
        struct page **page_pos;
        int ret;
@@ -346,47 +346,40 @@ more:
                ret = 0;
        hit_stripe = this_len < left;
        was_short = ret >= 0 && ret < this_len;
-       dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
+       dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
             ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
 
-       if (ret > 0) {
-               int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
-
-               if (read < pos - off) {
-                       dout(" zero gap %llu to %llu\n", off + read, pos);
-                       ceph_zero_page_vector_range(page_align + read,
-                                                   pos - off - read, pages);
+       if (ret >= 0) {
+               int didpages;
+               if (was_short && (pos + ret < inode->i_size)) {
+                       u64 tmp = min(this_len - ret,
+                                       inode->i_size - pos - ret);
+                       dout(" zero gap %llu to %llu\n",
+                               pos + ret, pos + ret + tmp);
+                       ceph_zero_page_vector_range(page_align + read + ret,
+                                                       tmp, pages);
+                       ret += tmp;
                }
+
+               didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
                pos += ret;
                read = pos - off;
                left -= ret;
                page_pos += didpages;
                pages_left -= didpages;
 
-               /* hit stripe? */
-               if (left && hit_stripe)
+               /* hit stripe and need continue*/
+               if (left && hit_stripe && pos < inode->i_size)
                        goto more;
        }
 
-       if (was_short) {
+       if (read > 0) {
+               ret = read;
                /* did we bounce off eof? */
                if (pos + left > inode->i_size)
                        *checkeof = 1;
-
-               /* zero trailing bytes (inside i_size) */
-               if (left > 0 && pos < inode->i_size) {
-                       if (pos + left > inode->i_size)
-                               left = inode->i_size - pos;
-
-                       dout("zero tail %d\n", left);
-                       ceph_zero_page_vector_range(page_align + read, left,
-                                                   pages);
-                       read += left;
-               }
        }
 
-       if (ret >= 0)
-               ret = read;
        dout("striped_read returns %d\n", ret);
        return ret;
 }
@@ -618,6 +611,8 @@ out:
                if (check_caps)
                        ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
                                        NULL);
+       } else if (ret != -EOLDSNAPC && written > 0) {
+               ret = written;
        }
        return ret;
 }