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

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(a)virtuozzo.com&gt; --- 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] = {