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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.71.154.42; envelope-from=prvs=485daf1e4=dmitry.fomichev@wdc.com; helo=esa4.hgst.iphmx.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/11 18:51:29 X-ACL-Warn: Detected OS = FreeBSD 9.x or newer [fuzzy] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dmitry Fomichev , Damien Le Moal , Alistair Francis , qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" If scsi-generic driver is in use, an SG node can be specified in the command line in place of a regular SCSI device. In this case, sg_get_max_segments() fails to open max_segments entry in sysfs because /dev/sgX is a character device. As the result, the maximum transfer size for the device may be calculated incorrectly, causing I/O errors if the maximum transfer size at the guest ends up to be larger compared to the host. Check system device type in sg_get_max_segments() and read the max_segments value differently if it is a character device. Reported-by: Johannes Thumshirn Fixes: 9103f1ceb46614b150bcbc3c9a4fbc72b47fedcc Signed-off-by: Dmitry Fomichev --- block/file-posix.c | 55 +++++++++++++++++++++++++++------------------- 1 file changed, 32 insertions(+), 23 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 094e3b0212..f9e2424e8f 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1108,6 +1108,7 @@ static int sg_get_max_segments(int fd) int ret; int sysfd =3D -1; long max_segments; + unsigned int max_segs; struct stat st; =20 if (fstat(fd, &st)) { @@ -1115,30 +1116,38 @@ static int sg_get_max_segments(int fd) goto out; } =20 - sysfspath =3D g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments= ", - major(st.st_rdev), minor(st.st_rdev)); - sysfd =3D open(sysfspath, O_RDONLY); - if (sysfd =3D=3D -1) { - ret =3D -errno; - goto out; + if (S_ISBLK(st.st_mode)) { + sysfspath =3D g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segm= ents", + major(st.st_rdev), minor(st.st_rdev)); + sysfd =3D open(sysfspath, O_RDONLY); + if (sysfd =3D=3D -1) { + ret =3D -errno; + goto out; + } + do { + ret =3D read(sysfd, buf, sizeof(buf) - 1); + } while (ret =3D=3D -1 && errno =3D=3D EINTR); + if (ret < 0) { + ret =3D -errno; + goto out; + } else if (ret =3D=3D 0) { + ret =3D -EIO; + goto out; + } + buf[ret] =3D 0; + /* The file is ended with '\n', pass 'end' to accept that. */ + ret =3D qemu_strtol(buf, &end, 10, &max_segments); + if (ret =3D=3D 0 && end && *end =3D=3D '\n') { + ret =3D max_segments; + } + } else { + ret =3D ioctl(fd, SG_GET_SG_TABLESIZE, &max_segs); + if (ret !=3D 0) { + ret =3D -errno; + goto out; + } + ret =3D max_segs; } - do { - ret =3D read(sysfd, buf, sizeof(buf) - 1); - } while (ret =3D=3D -1 && errno =3D=3D EINTR); - if (ret < 0) { - ret =3D -errno; - goto out; - } else if (ret =3D=3D 0) { - ret =3D -EIO; - goto out; - } - buf[ret] =3D 0; - /* The file is ended with '\n', pass 'end' to accept that. */ - ret =3D qemu_strtol(buf, &end, 10, &max_segments); - if (ret =3D=3D 0 && end && *end =3D=3D '\n') { - ret =3D max_segments; - } - out: if (sysfd !=3D -1) { close(sysfd); --=20 2.21.0 From nobody Mon Feb 9 18:26:46 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail header.i=@wdc.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=wdc.com ARC-Seal: i=1; a=rsa-sha256; t=1597186382; cv=none; d=zohomail.com; s=zohoarc; b=E4ovUmY8050VGIrmmHv8sR4OgBxcfu4p9qHEuWV5qiZSRB21bhVZ20yc/4i85Ty1KFghkEAhHroHlAR1YE7UKu3OhjxJocJMWfmgDB2HoqB7pnZR8uyk0qd/Rws6zYw1MfRIT9tV0R9M4d+a/s5e3rfJP6OEh8orsj6sGqn7mkE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1597186382; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=ELSSYlMxCnzHGA/ECy8UoV0GeV03oBonp2gLyrhKO1k=; b=TafK5GlIt4ITqdEN41AH8s5ipiTtQsEYVVNjDYGft6gqvlMCmkAgXF1HFM91CmNlizggCChhhjot6IIYBwFZ7Nm17MPW943pIfgcGLxgieAb+M8UTXr8K3FYMu/xNa5S6SY48bMCmBspzTjmrvDs0ze00Jo8SUHh73fKKHJXd1I= ARC-Authentication-Results: i=1; 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charset="utf-8" Several important steps during device scan depend on SCSI type of the device. For example, max_transfer property is only determined and assigned if the device has the type of TYPE_DISK. Host-managed ZBC disks retain most of the properties of regular SCSI drives, but they have their own SCSI device type, 0x14. This prevents the proper assignment of max_transfer property for HM-zoned devices in scsi-generic driver leading to I/O errors if the maximum i/o size calculated at the guest exceeds the host value. To fix this, define TYPE_ZBC to have the standard value from SCSI ZBC standard spec. Several scan steps that were previously done only for TYPE_DISK devices, are now performed for the SCSI devices having TYPE_ZBC too. Reported-by: Johannes Thumshirn Signed-off-by: Dmitry Fomichev Reviewed-by: Alistair Francis --- hw/scsi/scsi-generic.c | 10 ++++++---- include/scsi/constants.h | 1 + 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c index 86ed0a3822..2cb23ca891 100644 --- a/hw/scsi/scsi-generic.c +++ b/hw/scsi/scsi-generic.c @@ -162,7 +162,8 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq *r= , SCSIDevice *s) } } =20 - if (s->type =3D=3D TYPE_DISK && (r->req.cmd.buf[1] & 0x01)) { + if ((s->type =3D=3D TYPE_DISK || s->type =3D=3D TYPE_ZBC) && + (r->req.cmd.buf[1] & 0x01)) { page =3D r->req.cmd.buf[2]; if (page =3D=3D 0xb0) { uint32_t max_transfer =3D @@ -299,10 +300,11 @@ static void scsi_read_complete(void * opaque, int ret) } blk_set_guest_block_size(s->conf.blk, s->blocksize); =20 - /* Patch MODE SENSE device specific parameters if the BDS is opened + /* + * Patch MODE SENSE device specific parameters if the BDS is opened * readonly. */ - if ((s->type =3D=3D TYPE_DISK || s->type =3D=3D TYPE_TAPE) && + if ((s->type =3D=3D TYPE_DISK || s->type =3D=3D TYPE_TAPE || s->type = =3D=3D TYPE_ZBC) && blk_is_read_only(s->conf.blk) && (r->req.cmd.buf[0] =3D=3D MODE_SENSE || r->req.cmd.buf[0] =3D=3D MODE_SENSE_10) && @@ -617,7 +619,7 @@ static void scsi_generic_read_device_identification(SCS= IDevice *s) void scsi_generic_read_device_inquiry(SCSIDevice *s) { scsi_generic_read_device_identification(s); - if (s->type =3D=3D TYPE_DISK) { + if (s->type =3D=3D TYPE_DISK || s->type =3D=3D TYPE_ZBC) { scsi_generic_set_vpd_bl_emulation(s); } else { s->needs_vpd_bl_emulation =3D false; diff --git a/include/scsi/constants.h b/include/scsi/constants.h index 874176019e..2a32c08b5e 100644 --- a/include/scsi/constants.h +++ b/include/scsi/constants.h @@ -218,6 +218,7 @@ #define TYPE_ENCLOSURE 0x0d /* Enclosure Services Device */ #define TYPE_RBC 0x0e /* Simplified Direct-Access Device */ #define TYPE_OSD 0x11 /* Object-storage Device */ +#define TYPE_ZBC 0x14 /* Host-managed Zoned SCSI Device */ #define TYPE_WLUN 0x1e /* Well known LUN */ #define TYPE_NOT_PRESENT 0x1f #define TYPE_INACTIVE 0x20 --=20 2.21.0