Hi,
While discussing about the possible options to convert from GFID to
path, Venky suggested to search in Historical GlusterFS Changelogs and
get the information about Parent GFID and basename of the file. This
method works well for FOPs except Rename and Hard links.
Approach:
---------
Will consider b67b95a4-8bdc-44d5-aedd-b9b66fb0af95 as GFID for all
illustrations and file name as file1
1. If .glusterfs/b6/7b/b67b95a4-8bdc-44d5-aedd-b9b66fb0af95 is Symlink,
Readlink and Convert to relative path and Print(Easy conversion, done :))
2. If not Symlink, Stat on file
.glusterfs/b6/7b/b67b95a4-8bdc-44d5-aedd-b9b66fb0af95 and get
st_ctime(For example ctime is 1422694569)
3. Search for CHANGELOG.1422694565, CHANGELOG.1422694566..
CHANGELOG.1422694590. Break when you get actual Changelog file, else
break after MAX try.
4. If we didn't get valid Changelog file for that GFID, log GFID in stderr.
5. If Changelog file is available, Search in Changelog file for the
ENTRY pattern. If found extract Parent GFID and basename. Convert Parent
GFID to Path using readlink and add basename.
6. Get xattr trusted.gfid on the path we got and compare with input
GFID. If both are same then we are Good, else log in stderr. (File may
be changed after Create, may be Rename)
7. Collect all GFIDs from stderr and convert to Path using find .
-samefile <GFID FILE>
I created a Script using Python to find Path from GFID. Works really
well if Changelog is enabled before file/dir Creation.
https://github.com/aravindavk/gfid_to_path
Usage:
------
Download the Python Script(gfid_to_path) from
https://github.com/aravindavk/gfid_to_path and place it in any bin
directory which is available in PATH
chmod +x /usr/local/bin/gfid_to_path
To convert single GFID to Path
------------------------------
echo <GFID> | gfid_to_path <BRICK_PATH>
echo b67b95a4-8bdc-44d5-aedd-b9b66fb0af95 | gfid_to_path
/exports/bricks/b1
To convert list of GFIDs into Path,
----------------------------------
gfid_to_path <BRICK_PATH> <GFIDS LIST FILE>
gfid_to_path /exports/bricks/b1 ~/collected_gfids.txt
To record Converted paths in ~/good.txt and failures in ~/bad.txt
-----------------------------------------------------------------
gfid_to_path <BRICK_PATH> <GFIDS LIST FILE> 1> GOOD_FILE 2> BAD_FILE
gfid_to_path /exports/bricks/b1 ~/collected_gfids.txt 1> ~/good.txt
2> ~/bad.txt
Source is available in Github.
git clone https://github.com/aravindavk/gfid_to_path.git
C & S Welcome.
--
regards
Aravinda
http://aravindavk.in
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