libfdisk: ignore misaligned optimal I/O size
For example: # modprobe scsi_debug dev_size_mb=1000 opt_blks=65535 physblk_exp=3 creates a disk with: Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 33553920 bytes where 33553920 % 4096 != 0, it means that use Optimal I/O size to align partition results that partition is not aligned to physical sector boundary. Reported-by: Tom Yan <tom.ty89@gmail.com> Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -475,8 +475,17 @@ int fdisk_discover_topology(struct fdisk_context *cxt)
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/* I/O size used by fdisk */
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cxt->io_size = cxt->optimal_io_size;
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if (!cxt->io_size)
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/* optimal IO is optional, default to minimum IO */
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/* optimal I/O is optional, default to minimum IO */
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cxt->io_size = cxt->min_io_size;
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/* ignore optimal I/O if not aligned to phy.sector size */
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if (cxt->io_size
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&& cxt->phy_sector_size
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&& (cxt->io_size % cxt->phy_sector_size) != 0) {
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DBG(CXT, ul_debugobj(cxt, "ignore misaligned I/O size"));
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cxt->io_size = cxt->phy_sector_size;
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}
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}
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}
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blkid_free_probe(pr);
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@ -494,7 +503,7 @@ int fdisk_discover_topology(struct fdisk_context *cxt)
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DBG(CXT, ul_debugobj(cxt, "result: log/phy sector size: %ld/%ld",
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cxt->sector_size, cxt->phy_sector_size));
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DBG(CXT, ul_debugobj(cxt, "result: fdisk/min/optimal io: %ld/%ld/%ld",
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DBG(CXT, ul_debugobj(cxt, "result: fdisk/optimal/minimal io: %ld/%ld/%ld",
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cxt->io_size, cxt->optimal_io_size, cxt->min_io_size));
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return 0;
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}
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