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>

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 2626638dc..d305d013a 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);