From 3cad83075c7b847fe0eb6e61316fdf50984d4570 Mon Sep 17 00:00:00 2001 From: Roger Pau Monne Date: Tue, 21 Oct 2014 16:03:03 +0200 Subject: [PATCH 1/2] block: char devices on FreeBSD are not behind a pager MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Introduce a new flag to mark devices that require requests to be aligned and replace the usage of BDRV_O_NOCACHE and O_DIRECT with this flag when appropriate. If a character device is used as a backend on a FreeBSD host set this flag unconditionally. Signed-off-by: Roger Pau Monné Reviewed-by: Max Reitz Cc: Kevin Wolf Cc: Stefan Hajnoczi Signed-off-by: Max Reitz --- block/raw-posix.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) diff --git a/block/raw-posix.c b/block/raw-posix.c index ee4ca3c01e..475cf74655 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -150,6 +150,7 @@ typedef struct BDRVRawState { bool has_discard:1; bool has_write_zeroes:1; bool discard_zeroes:1; + bool needs_alignment; #ifdef CONFIG_FIEMAP bool skip_fiemap; #endif @@ -230,7 +231,7 @@ static void raw_probe_alignment(BlockDriverState *bs, int fd, Error **errp) /* For /dev/sg devices the alignment is not really used. With buffered I/O, we don't have any restrictions. */ - if (bs->sg || !(s->open_flags & O_DIRECT)) { + if (bs->sg || !s->needs_alignment) { bs->request_alignment = 1; s->buf_align = 1; return; @@ -446,6 +447,9 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, s->has_discard = true; s->has_write_zeroes = true; + if ((bs->open_flags & BDRV_O_NOCACHE) != 0) { + s->needs_alignment = true; + } if (fstat(s->fd, &st) < 0) { error_setg_errno(errp, errno, "Could not stat file"); @@ -472,6 +476,17 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, } #endif } +#ifdef __FreeBSD__ + if (S_ISCHR(st.st_mode)) { + /* + * The file is a char device (disk), which on FreeBSD isn't behind + * a pager, so force all requests to be aligned. This is needed + * so QEMU makes sure all IO operations on the device are aligned + * to sector size, or else FreeBSD will reject them with EINVAL. + */ + s->needs_alignment = true; + } +#endif #ifdef CONFIG_XFS if (platform_test_xfs_fd(s->fd)) { @@ -1076,11 +1091,12 @@ static BlockAIOCB *raw_aio_submit(BlockDriverState *bs, return NULL; /* - * If O_DIRECT is used the buffer needs to be aligned on a sector - * boundary. Check if this is the case or tell the low-level - * driver that it needs to copy the buffer. + * Check if the underlying device requires requests to be aligned, + * and if the request we are trying to submit is aligned or not. + * If this is the case tell the low-level driver that it needs + * to copy the buffer. */ - if ((bs->open_flags & BDRV_O_NOCACHE)) { + if (s->needs_alignment) { if (!bdrv_qiov_is_aligned(bs, qiov)) { type |= QEMU_AIO_MISALIGNED; #ifdef CONFIG_LINUX_AIO From 832390a5ed11e6c516db0986bf302d098e3ae36c Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Thu, 23 Oct 2014 15:29:12 +0200 Subject: [PATCH 2/2] qemu-img: Print error if check failed Currently, if bdrv_check() fails either by returning -errno or having check_errors set, qemu-img check just exits with 1 after having told the user that there were no errors on the image. This is bad. Instead of printing the check result if there were internal errors which were so bad that bdrv_check() could not even complete with 0 as a return value, qemu-img check should inform the user about the error. Signed-off-by: Max Reitz Reviewed-by: Eric Blake Reviewed-by: Markus Armbruster --- qemu-img.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/qemu-img.c b/qemu-img.c index 09e7e72f5a..731502c2ce 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -687,16 +687,23 @@ static int img_check(int argc, char **argv) check->corruptions_fixed = corruptions_fixed; } - switch (output_format) { - case OFORMAT_HUMAN: - dump_human_image_check(check, quiet); - break; - case OFORMAT_JSON: - dump_json_image_check(check, quiet); - break; + if (!ret) { + switch (output_format) { + case OFORMAT_HUMAN: + dump_human_image_check(check, quiet); + break; + case OFORMAT_JSON: + dump_json_image_check(check, quiet); + break; + } } if (ret || check->check_errors) { + if (ret) { + error_report("Check failed: %s", strerror(-ret)); + } else { + error_report("Check failed"); + } ret = 1; goto fail; }