Hi,
I am trying to understand the path-lookup in linux filesystem and was going through https://www.kernel.org/doc/Documentation/filesystems/path-lookup.txt
Under 'Rename' heading, I came across the negative lookup terminology, snapshot below
'Between deleting the dentry from the old hash list, and inserting it on the new
hash list, a lookup may find neither 'A' nor 'B' matching the dentry. The same
rename seqlock is also used to cover this race in much the same way, by
retrying a negative lookup result if a rename was in progress.'
Can anyone please help understanding the negative lookup concept and how do we achieve it. Thanks in advance.
Regards,
~Praveen.
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