Convert GFID to Path

GlusterFS internal file identifier (GFID) is a uuid that is unique to each file across the entire cluster. This is analogous to inode number in a normal filesystem. The GFID of a file is stored in its xattr named trusted.gfid.

Special mount using gfid-access translator:

# mount -t glusterfs -o aux-gfid-mount vm1:test /mnt/testvol

Assuming, you have GFID of a file from changelog (or somewhere else). For trying this out, you can get GFID of a file from mountpoint:

# getfattr -n glusterfs.gfid.string /mnt/testvol/dir/file

Get file path from GFID (Method 1):

(Lists hardlinks delimited by :, returns path as seen from mountpoint)

Turn on build-pgfid option

# gluster volume set test build-pgfid on

Read virtual xattr glusterfs.ancestry.path which contains the file path

getfattr -n glusterfs.ancestry.path -e text /mnt/testvol/.gfid/<GFID>

Example:

[root@vm1 glusterfs]# ls -il /mnt/testvol/dir/
total 1
10610563327990022372 -rw-r--r--. 2 root root 3 Jul 17 18:05 file
10610563327990022372 -rw-r--r--. 2 root root 3 Jul 17 18:05 file3

[root@vm1 glusterfs]# getfattr -n glusterfs.gfid.string /mnt/testvol/dir/file
getfattr: Removing leading '/' from absolute path names
# file: mnt/testvol/dir/file
glusterfs.gfid.string="11118443-1894-4273-9340-4b212fa1c0e4"

[root@vm1 glusterfs]# getfattr -n glusterfs.ancestry.path -e text /mnt/testvol/.gfid/11118443-1894-4273-9340-4b212fa1c0e4
getfattr: Removing leading '/' from absolute path names
# file: mnt/testvol/.gfid/11118443-1894-4273-9340-4b212fa1c0e4
glusterfs.ancestry.path="/dir/file:/dir/file3"

Get file path from GFID (Method 2):

(Does not list all hardlinks, returns backend brick path)

getfattr -n trusted.glusterfs.pathinfo -e text /mnt/testvol/.gfid/<GFID>

Example:

[root@vm1 glusterfs]# getfattr -n trusted.glusterfs.pathinfo -e text /mnt/testvol/.gfid/11118443-1894-4273-9340-4b212fa1c0e4
getfattr: Removing leading '/' from absolute path names
# file: mnt/testvol/.gfid/11118443-1894-4273-9340-4b212fa1c0e4
trusted.glusterfs.pathinfo="(<DISTRIBUTE:test-dht> <POSIX(/mnt/brick-test/b):vm1:/mnt/brick-test/b/dir//file3>)"

posix: placeholders for GFID to path conversion