Vijay Bellur has submitted this change and it was merged.
Change subject: fuse: auxiliary gfid mount support
......................................................................
fuse: auxiliary gfid mount support
* files can be accessed directly through their gfid and not just
through their paths. For eg., if the gfid of a file is
f3142503-c75e-45b1-b92a-463cf4c01f99, that file can be accessed
using <gluster-mount>/.gfid/f3142503-c75e-45b1-b92a-463cf4c01f99
.gfid is a virtual directory used to seperate out the namespace
for accessing files through gfid. This way, we do not conflict with
filenames which can be qualified as uuids.
* A new file/directory/symlink can be created with a pre-specified
gfid. A setxattr done on parent directory with fuse_auxgfid_newfile_args_t
initialized with appropriate fields as value to key "glusterfs.gfid.newfile"
results in the entry <parent>/bname whose gfid is set to args.gfid. The
contents of the structure should be in network byte order.
struct auxfuse_symlink_in {
char linkpath[]; /* linkpath is a null terminated string */
} __attribute__ ((__packed__));
struct auxfuse_mknod_in {
unsigned int mode;
unsigned int rdev;
unsigned int umask;
} __attribute__ ((__packed__));
struct auxfuse_mkdir_in {
unsigned int mode;
unsigned int umask;
} __attribute__ ((__packed__));
typedef struct {
unsigned int uid;
unsigned int gid;
char gfid[UUID_CANONICAL_FORM_LEN + 1]; /* a null terminated
gfid string
* in canonical form.
*/
unsigned int st_mode;
char bname[]; /* bname is a null terminated string */
union {
struct auxfuse_mkdir_in mkdir;
struct auxfuse_mknod_in mknod;
struct auxfuse_symlink_in symlink;
} __attribute__ ((__packed__)) args;
} __attribute__ ((__packed__)) fuse_auxgfid_newfile_args_t;
An initial consumer of this feature would be geo-replication to
create files on slave mount with same gfids as that on master.
It will also help gsyncd to access files directly through their
gfids. gsyncd in its newer version will be consuming a changelog
(of master) containing operations on gfids and sync corresponding
files to slave.
* Also, bring in support to heal gfids with a specific value.
fuse-bridge sends across a gfid during a lookup, which storage
translators assign to an inode (file/directory etc) if there is
no gfid associated it. This patch brings in support
to specify that gfid value from an application, instead of relying
on random gfid generated by fuse-bridge.
gfids can be healed through setxattr interface. setxattr should be
done on parent directory. The key used is "glusterfs.gfid.heal"
and the value should be the following structure whose contents
should be in network byte order.
typedef struct {
char gfid[UUID_CANONICAL_FORM_LEN + 1]; /* a null terminated gfid
* string in canonical
form
*/
char bname[]; /* a null terminated basename */
} __attribute__((__packed__)) fuse_auxgfid_heal_args_t;
This feature can be used for upgrading older geo-rep setups where gfids
of files are different on master and slave to newer setups where they
should be same. One can delete gfids on slave using setxattr -x and
.glusterfs and issue stat on all the files with gfids from master.
Thanks to "Amar Tumballi" <address@hidden> and "Csaba Henk"
<address@hidden> for their inputs.
Signed-off-by: Raghavendra G <address@hidden>
Change-Id: Ie8ddc0fb3732732315c7ec49eab850c16d905e4e
BUG: 952029
Reviewed-on: http://review.gluster.com/#/c/4702
Reviewed-by: Amar Tumballi <address@hidden>
Tested-by: Amar Tumballi <address@hidden>
Reviewed-on: http://review.gluster.org/4702
Reviewed-by: Xavier Hernandez <address@hidden>
Tested-by: Gluster Build System <address@hidden>
Reviewed-by: Vijay Bellur <address@hidden>
---
M glusterfsd/src/glusterfsd.c
M glusterfsd/src/glusterfsd.h
M libglusterfs/src/glusterfs.h
M libglusterfs/src/inode.c
M libglusterfs/src/inode.h
M xlators/cluster/dht/src/dht-common.c
M xlators/mount/fuse/src/Makefile.am
M xlators/mount/fuse/src/fuse-bridge.c
M xlators/mount/fuse/src/fuse-bridge.h
M xlators/mount/fuse/src/fuse-helpers.c
A xlators/mount/fuse/src/glfs-fuse-bridge.h
M xlators/mount/fuse/utils/mount.glusterfs.in
M xlators/storage/posix/src/posix.c
13 files changed, 1,317 insertions(+), 136 deletions(-)
Approvals:
Xavier Hernandez: Looks good to me, but someone else must approve
Amar Tumballi: Looks good to me, approved
Vijay Bellur: Looks good to me, approved
Gluster Build System: Verified