summaryrefslogtreecommitdiffstats
path: root/xlators/mount/fuse/src/fuse-bridge.h
diff options
context:
space:
mode:
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/src/fuse-bridge.h
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/src/fuse-bridge.h')
-rw-r--r--xlators/mount/fuse/src/fuse-bridge.h26
1 files changed, 25 insertions, 1 deletions
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index 2626638dc4f..d305d013a15 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -30,6 +30,7 @@
#include "defaults.h"
#include "common-utils.h"
#include "statedump.h"
+#include "glfs-fuse-bridge.h"
#ifdef GF_DARWIN_HOST_OS
/* This is MacFUSE's marker for MacFUSE-specific code */
@@ -50,12 +51,26 @@
#if defined(GF_LINUX_HOST_OS) || defined(__NetBSD__)
#define FUSE_OP_HIGH (FUSE_READDIRPLUS + 1)
#endif
+
#ifdef GF_DARWIN_HOST_OS
#define FUSE_OP_HIGH (FUSE_DESTROY + 1)
#endif
#define GLUSTERFS_XATTR_LEN_MAX 65536
#define MAX_FUSE_PROC_DELAY 1
+#define GF_GFID_KEY "GLUSTERFS_GFID"
+#define GF_GFID_DIR ".gfid"
+#define GF_AUX_GFID 0xd
+
+typedef enum {
+ GF_FUSE_PATH_NAMESPACE,
+ GF_FUSE_GFID_NAMESPACE
+} gf_lookup_namespace_t;
+
+typedef struct {
+ inode_t *inode_path_ns;
+ inode_t *inode_gfid_ns;
+} gf_fuse_nodeid_t;
typedef struct fuse_in_header fuse_in_header_t;
typedef void (fuse_handler_t) (xlator_t *this, fuse_in_header_t *finh,
@@ -122,6 +137,14 @@ struct fuse_private {
/* for using fuse-kernel readdirp*/
gf_boolean_t use_readdirp;
+
+ gf_boolean_t aux_gfid_mount;
+ /* root inode's stbuf */
+ struct iatt root_stbuf;
+ struct iatt gfiddir_stbuf;
+ struct mem_pool *fuse_nodeid_pool;
+ struct mem_pool *auxgfid_newfile_args_pool;
+ struct mem_pool *auxgfid_heal_args_pool;
};
typedef struct fuse_private fuse_private_t;
@@ -509,7 +532,8 @@ void gf_fuse_stat2attr (struct iatt *st, struct fuse_attr *fa,
gf_boolean_t enable_ino32);
void gf_fuse_fill_dirent (gf_dirent_t *entry, struct fuse_dirent *fde,
gf_boolean_t enable_ino32);
-uint64_t inode_to_fuse_nodeid (inode_t *inode);
+uint64_t
+inode_to_fuse_nodeid (xlator_t *this, inode_t *inode, gf_lookup_namespace_t ns);
xlator_t *fuse_active_subvol (xlator_t *fuse);
inode_t *fuse_ino_to_inode (uint64_t ino, xlator_t *fuse);
int send_fuse_err (xlator_t *this, fuse_in_header_t *finh, int error);