Messages in this thread |  | | Date | Wed, 03 Oct 2001 16:17:54 +0400 | From | "Vladimir V. Saveliev" <> | Subject | bug? in using generic read/write functions to read/write block devices in 2.4.11-pre2 |
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Hi
It looks like something wrong happens with writing/reading to block device using generic read/write functions when one does:
mke2fs /dev/hda1 (blocksize is 4096) mount /dev/hda1 umount /dev/hda1 mke2fs /dev/hda1 - FAILS with Warning: could not write 8 blocks in inode table starting at 492004: Attempt to write block from filesystem resulted in short write
(note that /dev/hda1 should be big enough - 3gb is enogh for example)
Explanation of what happens (could be wrong and unclear):
blocksize of /dev/hda1 was 1024. So, /dev/hda1's inode->i_blkbits is set to 10. mount-ing used set_blocksize() to change blocksize to 4096 in blk_size[][]. But inode of /dev/hda1 still has i_blkbits which makes block_prepare_write to create buffers of 1024 bytes and call blkdev_get_block for each of them. fs/block_dev.c:/max_block calculates number of blocks on the device using blk_size[][] and thinks that there are 4 times less blocks on the device.
Thanks, vs
PS: thanks to Elena <grev@namesys.botik.ru> for finding that
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