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author | Karel Zak | 2013-02-04 11:28:09 +0100 |
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committer | Karel Zak | 2013-02-04 11:28:09 +0100 |
commit | cd0fe5c1659d4144610ffd76500002e98b873e0b (patch) | |
tree | 889cb6f7bd291fbc3b6eb0e690af826fa2288224 /.gitignore | |
parent | newgrp: more robust crypt() usage (diff) | |
download | kernel-qcow2-util-linux-cd0fe5c1659d4144610ffd76500002e98b873e0b.tar.gz kernel-qcow2-util-linux-cd0fe5c1659d4144610ffd76500002e98b873e0b.tar.xz kernel-qcow2-util-linux-cd0fe5c1659d4144610ffd76500002e98b873e0b.zip |
libblkid: add blkid_probe_step_back()
It seems that blkid_do_probe() is too high-level solution for some
mkfs programs (for example ext4 mkfs supports "undo" so all write
operations has to be implemented by filesystem specific functions).
The new function blkid_probe_step_back() resets internal libblkid
buffers and move probing stuff one step back. It means that the
previously used probing function will be called again in the next
blkid_do_probe() call. This allows to modify on-disk data and check
for backup superblocks or alternative magic strings. Something like:
while (blkid_do_probe(pr) == 0) {
... get SBMAGIC_OFFSET and SBMAGIC len ...
... use your private seek & write() ...
blkid_probe_step_back(pr);
}
References: https://bugzilla.redhat.com/show_bug.cgi?id=902512
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions