ceph: fix bugs about handling short-read for sync read mode.

cephfs . show_layout
>layyout.data_pool:     0
>layout.object_size:   4194304
>layout.stripe_unit:   4194304
>layout.stripe_count:  1

TestA:
>dd if=/dev/urandom of=test bs=1M count=2 oflag=direct
>dd if=/dev/urandom of=test bs=1M count=2 seek=4  oflag=direct
>dd if=test of=/dev/null bs=6M count=1 iflag=direct
The messages from func striped_read are:
ceph:           file.c:350  : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT
ceph:           file.c:350  : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT
ceph:           file.c:381  : zero tail 4194304
ceph:           file.c:390  : striped_read returns 6291456
The hole of file is from 2M--4M.But actualy it zero the last 4M include
the last 2M area which isn't a hole.
Using this patch, the messages are:
ceph:           file.c:350  : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT
ceph:           file.c:358  :  zero gap 2097152 to 4194304
ceph:           file.c:350  : striped_read 4194304~2097152 (read 4194304) got 2097152
ceph:           file.c:384  : striped_read returns 6291456

TestB:
>echo majianpeng > test
>dd if=test of=/dev/null bs=2M count=1 iflag=direct
The messages are:
ceph:           file.c:350  : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT
ceph:           file.c:350  : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT
ceph:           file.c:390  : striped_read returns 11
For this case,it did once more striped_read.It's no meaningless.
Using this patch, the message are:
ceph:           file.c:350  : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT
ceph:           file.c:384  : striped_read returns 11

Big thanks to Yan Zheng for the patch.

Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>

1 files changed, 16 insertions, 23 deletions

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index d5e12f580671..98b9035b2e81 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -350,44 +350,37 @@ more:
         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 (ret >= 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 %llu\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;
 }