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authorRaghavendra G <rgowdapp@redhat.com>2013-07-16 11:49:20 +0530
committerVijay Bellur <vbellur@redhat.com>2013-07-19 01:14:08 -0700
commit4c0f4c8a89039b1fa1c9c015fb6f273268164c20 (patch)
tree9ba8467b43cf0fd822dbee97ba90292aa2a2acdd /xlators/mount/fuse/utils
parenta1ebee3b0a8cf4526ab396ae8cad55634fad17fc (diff)
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" <amarts@redhat.com> and "Csaba Henk" <csaba@redhat.com> for their inputs. Signed-off-by: Raghavendra G <rgowdapp@redhat.com> Change-Id: Ie8ddc0fb3732732315c7ec49eab850c16d905e4e BUG: 952029 Reviewed-on: http://review.gluster.com/#/c/4702 Reviewed-by: Amar Tumballi <amarts@redhat.com> Tested-by: Amar Tumballi <amarts@redhat.com> Reviewed-on: http://review.gluster.org/4702 Reviewed-by: Xavier Hernandez <xhernandez@datalab.es> Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Diffstat (limited to 'xlators/mount/fuse/utils')
-rwxr-xr-xxlators/mount/fuse/utils/mount.glusterfs.in16
1 files changed, 12 insertions, 4 deletions
diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index c0a2ed1..0f78483 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -122,6 +122,10 @@ start_glusterfs ()
cmd_line=$(echo "$cmd_line --mem-accounting");
fi
+ if [ -n "$aux_gfid_mount" ]; then
+ cmd_line=$(echo "$cmd_line --aux-gfid-mount");
+ fi
+
#options with values start here
if [ -n "$log_level" ]; then
cmd_line=$(echo "$cmd_line --log-level=$log_level");
@@ -268,13 +272,13 @@ mount.glusterfs --version"
# check for recursive mounts. i.e, mounting over an existing brick
check_recursive_mount ()
{
- if [ $2 = "/" ]; then
+ if [ $1 = "/" ]; then
echo Cannot mount over root;
exit 2;
fi
# GFID check first
# remove trailing / from mount point
- mnt_dir=${2%/};
+ mnt_dir=${1%/};
export PATH;
# check whether getfattr exists
@@ -333,7 +337,6 @@ check_recursive_mount ()
main ()
{
helper=$(echo "$@" | sed -n 's/.*\--[ ]*\([^ ]*\).*/\1/p');
-
in_opt="no"
pos_args=0
for opt in "$@"; do
@@ -348,6 +351,11 @@ main ()
"fopen-keep-cache") fopen_keep_cache=1 ;;
"enable-ino32") enable_ino32=1 ;;
"mem-accounting") mem_accounting=1;;
+ "aux-gfid-mount")
+ if [ `uname -s` = "Linux" ]; then
+ aux_gfid_mount=1
+ fi
+ ;;
# "mount -t glusterfs" sends this, but it's useless.
"rw") ;;
# these ones are interpreted during system initialization
@@ -437,7 +445,7 @@ main ()
exit 0;
fi
- check_recursive_mount "$@";
+ check_recursive_mount "$mount_point";
# Append fuse.glusterfs to PRUNEFS variable in updatedb.conf(5). updatedb(8)
# should not index files under GlusterFS, indexing will slow down GlusteFS