* Re: How to detect if ubi volume is empty [not found] <CAOuPNLhN2pxa5KPpxiCBZMEGTgqaNddB6DZeB17tanp2gQgX1w@mail.gmail.com> @ 2024-05-20 10:22 ` Pintu Agarwal 2024-05-21 11:08 ` Zhihao Cheng 0 siblings, 1 reply; 2+ messages in thread From: Pintu Agarwal @ 2024-05-20 10:22 UTC (permalink / raw) To: linux-mtd, linux-fsdevel, linux-fsdevel, Ezequiel Garcia, Bjørn Mork Hi, In Linux Kernel 5.15 is there a way to detect in runtime, if UBI volume (squashfs based, ubiblock, dynamic) is empty or not ? Based on this we need to make some decisions at runtime. Currently, we are using a crude way to detect volume empty by reading the first 1K block using the "dd" command and checking if the contents are all FF. Is this good enough, or is there some other better way ? Thanks. Pintu ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to detect if ubi volume is empty 2024-05-20 10:22 ` How to detect if ubi volume is empty Pintu Agarwal @ 2024-05-21 11:08 ` Zhihao Cheng 0 siblings, 0 replies; 2+ messages in thread From: Zhihao Cheng @ 2024-05-21 11:08 UTC (permalink / raw) To: Pintu Agarwal, linux-mtd, linux-fsdevel, linux-fsdevel, Ezequiel Garcia, Bjørn Mork 在 2024/5/20 18:22, Pintu Agarwal 写道: > Hi, > > In Linux Kernel 5.15 is there a way to detect in runtime, if UBI > volume (squashfs based, ubiblock, dynamic) is empty or not ? There is a way to get the empty state of UBI volume by ioctl UBI_IOCEBUNMAP, for example: fd = open(UBI_VOLUME, O_EXCL) check_volume_empty [1] close(fd) [1] https://www.linux-mtd.infradead.org/?p=mtd-utils.git;a=blob;f=ubifs-utils/mkfs.ubifs/mkfs.ubifs.c;h=42a47f839e115567de58e8cdfcc50c4202fc7af1;hb=refs/heads/master#l2804 > Based on this we need to make some decisions at runtime. > > Currently, we are using a crude way to detect volume empty by reading > the first 1K block using the "dd" command and checking if the contents > are all FF. > > Is this good enough, or is there some other better way ? > > Thanks. > Pintu > > . ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <CAOuPNLhN2pxa5KPpxiCBZMEGTgqaNddB6DZeB17tanp2gQgX1w@mail.gmail.com>
2024-05-20 10:22 ` How to detect if ubi volume is empty Pintu Agarwal
2024-05-21 11:08 ` Zhihao Cheng
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