mount/fuse: Handle fd resolution failuresv3.5.3beta1

        Backport of http://review.gluster.org/8402

Problem:
Even when the fd resolution failed, the fop is continuing on the
new graph which may not have valid inode. This lead to NULL layout
subvols in dht which lead to crash in fsync after graph migration.

Fix:
- Remove resolution error handling in FUSE_FOP as it was only added
  to handle fd migration failures.
- check in fuse_resolve_done for fd resolution failures and fail the
  fop right away.
- loc resolution failures are already handled in the corresponding
  fops.
- Return errno from state->resolve.op_errno in resume functions.
- Send error to fuse on frame allocation failures.
- Removed unused variable state->resolved
- Removed unused macro FUSE_FOP_COOKIE

BUG: 1136835
Change-Id: I5074f7a9b177c54051ef37a4f73de7f8d1fcc5b7
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8595
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/tests/bugs/bug-1126048.c b/tests/bugs/bug-1126048.c
new file mode 100644
index 00000000000..2282bb2025e
--- /dev/null
+++ b/tests/bugs/bug-1126048.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+
+/*
+ * This function opens a file and to trigger migration failure, unlinks the
+ * file and performs graph switch (cmd passed in argv). If everything goes fine,
+ * fsync should fail without crashing the mount process.
+ */
+int
+main (int argc, char **argv)
+{
+        int ret = 0;
+        int fd = 0;
+        char    *cmd = argv[1];
+
+        printf ("cmd is: %s\n", cmd);
+        fd = open("a.txt", O_CREAT|O_RDWR);
+        if (fd < 0)
+                printf ("open failed: %s\n", strerror(errno));
+
+        ret = unlink("a.txt");
+        if (ret < 0)
+                printf ("unlink failed: %s\n", strerror(errno));
+        if (write (fd, "abc", 3) < 0)
+                printf ("Not able to print %s\n", strerror (errno));
+        system(cmd);
+        sleep(1); //No way to confirm graph switch so sleep 1
+        ret = fsync(fd);
+        if (ret < 0)
+                printf ("Not able to fsync %s\n", strerror (errno));
+        return 0;
+}