Closed RoyWFHuang closed 6 months ago
When create a hard link and then remove this hard link, at this time we use "ls" to list all files, the file lists will not correct showing the result
here is showing result:
.: ls: cannot access 'hdlink': No such file or directory total 1 -rw-r--r-- 1 root root 0 Feb 19 03:32 file2 ?????????? ? ? ? ? ? hdlink
this means the rm hard link remove the original file, not remove hard link file
In unlink function, we not only need to check ino number is the same, but also check the the inode block name is the same
Add to check the find block's name is the same with remove name
run: touch file1 run: touch file2 run:ln file1 hdlink run:ls -lR .: total 2 -rw-r--r-- 2 root root 0 Feb 19 15:00 file1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file2 -rw-r--r-- 2 root root 0 Feb 19 15:00 hdlink run:rm hdlink run:ls -lR .: total 1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file2
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Yueh-Wang
commented
6 months ago Yueh-Wang
commented
6 months ago
Description
When create a hard link and then remove this hard link, at this time we use "ls" to list all files, the file lists will not correct showing the result
here is showing result:
.: ls: cannot access 'hdlink': No such file or directory total 1 -rw-r--r-- 1 root root 0 Feb 19 03:32 file2 ?????????? ? ? ? ? ? hdlink
this means the rm hard link remove the original file, not remove hard link file
Root cause
In unlink function, we not only need to check ino number is the same, but also check the the inode block name is the same
Fix solution
Add to check the find block's name is the same with remove name
How has this been tested:
run: touch file1 run: touch file2 run:ln file1 hdlink run:ls -lR .: total 2 -rw-r--r-- 2 root root 0 Feb 19 15:00 file1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file2 -rw-r--r-- 2 root root 0 Feb 19 15:00 hdlink run:rm hdlink run:ls -lR .: total 1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file1 -rw-r--r-- 1 root root 0 Feb 19 15:00 file2