[PATCH 6/6] storage:dir: adapts .refreshVol .refreshPool for ploop volumes

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To update information about ploop volumes inside the a single pool we need
to be sure that it is the ploop directory and not some other directory.
Ploop volume directory obligatory contains root.hds - image file and disk
descriptor - DiskDescriptor.xml. If path to a volume is a path to some
directory, we check the existance of this files.

The capacity of a ploop volume is obtained via offset
in the header file:
https://openvz.org/Ploop/format

Signed-off-by: Olga Krishtal <okrishtal@xxxxxxxxxxxxx>
---
 src/storage/storage_backend.c         | 90 ++++++++++++++++++++++++++---------
 src/storage/storage_backend.h         |  2 +-
 src/storage/storage_backend_fs.c      |  6 ++-
 src/storage/storage_backend_logical.c |  2 +-
 src/util/virstoragefile.c             |  8 +++-
 5 files changed, 81 insertions(+), 27 deletions(-)

diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index 21dd96d..0c31f32 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -1584,6 +1584,25 @@ virStorageBackendDetectBlockVolFormatFD(virStorageSourcePtr target,
     return 0;
 }
 
+static bool virStorageBackendIsPloopDir(char *path)
+{
+    char *file = NULL;
+    bool ret = false;
+
+    if (virAsprintf(&file, "%s/%s", path, "root.hds") < 0)
+        return ret;
+    if (!virFileExists(file))
+        goto cleanup;
+    VIR_FREE(file);
+    if (virAsprintf(&file, "%s/%s", path, "DiskDescriptor.xml") < 0)
+        goto cleanup;
+    if (!virFileExists(file))
+        goto cleanup;
+    ret = true;
+ cleanup:
+    VIR_FREE(file);
+    return ret;
+}
 
 /*
  * Allows caller to silently ignore files with improper mode
@@ -1592,29 +1611,35 @@ virStorageBackendDetectBlockVolFormatFD(virStorageSourcePtr target,
  * return -2 if file mode is unexpected or the volume is a dangling
  * symbolic link.
  */
+
+#define FAILED_STAT(path, ret) { \
+    if (errno == ENOENT) { \
+        if (noerror) { \
+            VIR_WARN("ignoring missing file '%s'", path);\
+            ret = -2; \
+        } \
+        virReportError(VIR_ERR_NO_STORAGE_VOL, \
+            _("no storage vol with matching path '%s'"), path); \
+            ret = -1; \
+    } \
+    virReportSystemError(errno, \
+             _("cannot stat file '%s'"), path);\
+    ret = -1;\
+}
+
 int
-virStorageBackendVolOpen(const char *path, struct stat *sb,
+virStorageBackendVolOpen(virStorageSourcePtr target, struct stat *sb,
                          unsigned int flags)
 {
-    int fd, mode = 0;
-    char *base = last_component(path);
+    int fd, mode = 0, ret = 0;
+    char *base = last_component(target->path);
     bool noerror = (flags & VIR_STORAGE_VOL_OPEN_NOERROR);
+    char *path = target->path;
+    char *ploop_path = NULL;
 
     if (lstat(path, sb) < 0) {
-        if (errno == ENOENT) {
-            if (noerror) {
-                VIR_WARN("ignoring missing file '%s'", path);
-                return -2;
-            }
-            virReportError(VIR_ERR_NO_STORAGE_VOL,
-                           _("no storage vol with matching path '%s'"),
-                           path);
-            return -1;
-        }
-        virReportSystemError(errno,
-                             _("cannot stat file '%s'"),
-                             path);
-        return -1;
+        FAILED_STAT(path, ret);
+        return ret;
     }
 
     if (S_ISFIFO(sb->st_mode)) {
@@ -1633,6 +1658,18 @@ virStorageBackendVolOpen(const char *path, struct stat *sb,
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Volume path '%s' is a socket"), path);
         return -1;
+    } else if (S_ISDIR(sb->st_mode)) {
+        if (virStorageBackendIsPloopDir(path)) {
+            if (virAsprintf(&ploop_path, "%s/%s", target->path, "root.hds") < 0)
+                return -1;
+            path = ploop_path;
+            target->format = VIR_STORAGE_FILE_PLOOP;
+            if (lstat(path, sb) < 0) {
+                FAILED_STAT(path, ret);
+                VIR_FREE(ploop_path);
+                return ret;
+            }
+        }
     }
 
     /* O_NONBLOCK should only matter during open() for fifos and
@@ -1729,6 +1766,7 @@ virStorageBackendVolOpen(const char *path, struct stat *sb,
         return -1;
     }
 
+    VIR_FREE(ploop_path);
     return fd;
 }
 
@@ -1756,8 +1794,10 @@ virStorageBackendUpdateVolTargetInfo(virStorageSourcePtr target,
     virStorageSourcePtr meta = NULL;
     char *buf = NULL;
     ssize_t len = VIR_STORAGE_MAX_HEADER;
+    char *path = NULL;
+    char *target_path = target->path;
 
-    if ((ret = virStorageBackendVolOpen(target->path, &sb, openflags)) < 0)
+    if ((ret = virStorageBackendVolOpen(target, &sb, openflags)) < -1)
         goto cleanup;
     fd = ret;
 
@@ -1772,7 +1812,7 @@ virStorageBackendUpdateVolTargetInfo(virStorageSourcePtr target,
         }
 
         if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
-            virReportSystemError(errno, _("cannot seek to start of '%s'"), target->path);
+            virReportSystemError(errno, _("cannot seek to start of '%s'"), target_path);
             ret = -1;
             goto cleanup;
         }
@@ -1780,18 +1820,23 @@ virStorageBackendUpdateVolTargetInfo(virStorageSourcePtr target,
         if ((len = virFileReadHeaderFD(fd, len, &buf)) < 0) {
             if (readflags & VIR_STORAGE_VOL_READ_NOERROR) {
                 VIR_WARN("ignoring failed header read for '%s'",
-                         target->path);
+                         target_path);
                 ret = -2;
             } else {
                 virReportSystemError(errno,
                                      _("cannot read header '%s'"),
-                                     target->path);
+                                     target_path);
                 ret = -1;
             }
             goto cleanup;
         }
 
-        if (!(meta = virStorageFileGetMetadataFromBuf(target->path, buf, len, target->format,
+        if (target->format == VIR_STORAGE_FILE_PLOOP) {
+            if (virAsprintf(&path, "%s/%s", target->path, "root.hds") < 0)
+                return -1;
+            target_path = path;
+        }
+        if (!(meta = virStorageFileGetMetadataFromBuf(target_path, buf, len, target->format,
                                                       NULL))) {
             ret = -1;
             goto cleanup;
@@ -1811,6 +1856,7 @@ virStorageBackendUpdateVolTargetInfo(virStorageSourcePtr target,
     virStorageSourceFree(meta);
     VIR_FORCE_CLOSE(fd);
     VIR_FREE(buf);
+    VIR_FREE(path);
     return ret;
 }
 
diff --git a/src/storage/storage_backend.h b/src/storage/storage_backend.h
index 1de8dfe..7dca559 100644
--- a/src/storage/storage_backend.h
+++ b/src/storage/storage_backend.h
@@ -206,7 +206,7 @@ enum {
 # define VIR_STORAGE_VOL_OPEN_DEFAULT (VIR_STORAGE_VOL_OPEN_REG      |\
                                        VIR_STORAGE_VOL_OPEN_BLOCK)
 
-int virStorageBackendVolOpen(const char *path, struct stat *sb,
+int virStorageBackendVolOpen(virStorageSourcePtr target, struct stat *sb,
                              unsigned int flags)
     ATTRIBUTE_RETURN_CHECK
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index c2d148d..c340c69 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -75,7 +75,7 @@ virStorageBackendProbeTarget(virStorageSourcePtr target,
     if (encryption)
         *encryption = NULL;
 
-    if ((rc = virStorageBackendVolOpen(target->path, &sb,
+    if ((rc = virStorageBackendVolOpen(target, &sb,
                                        VIR_STORAGE_VOL_FS_PROBE_FLAGS)) < 0)
         return rc; /* Take care to propagate rc, it is not always -1 */
     fd = rc;
@@ -83,6 +83,10 @@ virStorageBackendProbeTarget(virStorageSourcePtr target,
     if (virStorageBackendUpdateVolTargetInfoFD(target, fd, &sb) < 0)
         goto cleanup;
 
+    if (target->format == VIR_STORAGE_FILE_PLOOP) {
+        ret = 0;
+        goto cleanup;
+    }
     if (S_ISDIR(sb.st_mode)) {
         target->format = VIR_STORAGE_FILE_DIR;
         ret = 0;
diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c
index ba26223..aaace5b 100644
--- a/src/storage/storage_backend_logical.c
+++ b/src/storage/storage_backend_logical.c
@@ -955,7 +955,7 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
     virCommandFree(cmd);
     cmd = NULL;
 
-    if ((fd = virStorageBackendVolOpen(vol->target.path, &sb,
+    if ((fd = virStorageBackendVolOpen(&vol->target, &sb,
                                        VIR_STORAGE_VOL_OPEN_DEFAULT)) < 0)
         goto error;
 
diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 101070f..d92da30 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -184,6 +184,10 @@ qedGetBackingStore(char **, int *, const char *, size_t);
 #define QED_F_BACKING_FILE 0x01
 #define QED_F_BACKING_FORMAT_NO_PROBE 0x04
 
+/* Location of ploop image size in the header file *
+ * https://openvz.org/Ploop/format */
+#define PLOOP_IMAGE_SIZE_OFFSET 36
+#define PLOOP_SIZE_MULTIPLIER 512
 
 static struct FileTypeInfo const fileTypeInfo[] = {
     [VIR_STORAGE_FILE_NONE] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
@@ -236,8 +240,8 @@ static struct FileTypeInfo const fileTypeInfo[] = {
                                -1, {0}, 0, 0, 0, 0, NULL, NULL },
     [VIR_STORAGE_FILE_VHD] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
                                -1, {0}, 0, 0, 0, 0, NULL, NULL },
-    [VIR_STORAGE_FILE_PLOOP] = { 0, NULL, NULL, LV_LITTLE_ENDIAN,
-                               -1, {0}, 0, 0, 0, 0, NULL, NULL },
+    [VIR_STORAGE_FILE_PLOOP] = { 0, "ploop", NULL, LV_LITTLE_ENDIAN,
+                               -1, {0}, PLOOP_IMAGE_SIZE_OFFSET, 0, PLOOP_SIZE_MULTIPLIER, 0, NULL, NULL },
 
     /* All formats with a backing store probe below here */
     [VIR_STORAGE_FILE_COW] = {
-- 
1.8.3.1

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