diff options
Diffstat (limited to 'xlators/nfs/server/src/nfs3-fh.h')
| -rw-r--r-- | xlators/nfs/server/src/nfs3-fh.h | 88 |
1 files changed, 43 insertions, 45 deletions
diff --git a/xlators/nfs/server/src/nfs3-fh.h b/xlators/nfs/server/src/nfs3-fh.h index f526edf43..1049cdc96 100644 --- a/xlators/nfs/server/src/nfs3-fh.h +++ b/xlators/nfs/server/src/nfs3-fh.h @@ -1,20 +1,11 @@ /* - Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com> + Copyright (c) 2010-2011 Gluster, Inc. <http://www.gluster.com> This file is part of GlusterFS. - GlusterFS is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published - by the Free Software Foundation; either version 3 of the License, - or (at your option) any later version. - - GlusterFS is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see - <http://www.gnu.org/licenses/>. + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. */ #ifndef _NFS_FH_H_ @@ -29,62 +20,62 @@ #include "xdr-nfs3.h" #include "iatt.h" #include <sys/types.h> +#include "uuid.h" /* BIG FAT WARNING: The file handle code is tightly coupled to NFSv3 file * handles for now. This will change if and when we need v4. */ #define GF_NFSFH_IDENT0 ':' #define GF_NFSFH_IDENT1 'O' -#define GF_NFSFH_IDENT_SIZE (sizeof(char) * 2) -#define GF_NFSFH_STATIC_SIZE (GF_NFSFH_IDENT_SIZE + sizeof (uint16_t) + sizeof (uint16_t) + sizeof (uint64_t) + sizeof(uint64_t)) -#define GF_NFSFH_MAX_HASH_BYTES (NFS3_FHSIZE - GF_NFSFH_STATIC_SIZE) - -/* Each hash element in the file handle is of 2 bytes thus giving - * us theoretically 65536 unique entries in a directory. - */ -typedef uint16_t nfs3_hash_entry_t; -#define GF_NFSFH_ENTRYHASH_SIZE (sizeof (nfs3_hash_entry_t)) -#define GF_NFSFH_MAXHASHES ((int)(GF_NFSFH_MAX_HASH_BYTES / GF_NFSFH_ENTRYHASH_SIZE)) +#define GF_NFSFH_IDENT2 'G' +#define GF_NFSFH_IDENT3 'L' +#define GF_NFSFH_IDENT_SIZE (sizeof(char) * 4) +#define GF_NFSFH_STATIC_SIZE (GF_NFSFH_IDENT_SIZE + (2*sizeof (uuid_t))) +#define nfs3_fh_exportid_to_index(exprtid) ((uint16_t)exprtid[15]) /* ATTENTION: Change in size of the structure below should be reflected in the * GF_NFSFH_STATIC_SIZE. */ struct nfs3_fh { /* Used to ensure that a bunch of bytes are actually a GlusterFS NFS - * file handle. Should contain ":O" + * file handle. Should contain ":OGL" */ - char ident[2]; - - /* Number of file/ino hash elements that follow the ino. */ - uint16_t hashcount; - - /* Basically, the position/index of an xlator among the children of - * the NFS xlator. + char ident[4]; + + /* UUID that identifies an export. The value stored in exportid + * depends on the usage of gluster nfs. If the DVM is enabled using + * the nfs.dynamic-volumes option then exportid will contain the UUID + * of the volume so that gnfs is able to identify volumes uniquely + * through volume additions,deletions,migrations, etc. + * + * When not using dvm, exportid contains the index of the volume + * based on the position of the volume in the list of subvolumes + * for gnfs. */ - uint16_t xlatorid; - uint64_t gen; - uint64_t ino; - nfs3_hash_entry_t entryhash[GF_NFSFH_MAXHASHES]; + uuid_t exportid; + + /* File/dir gfid. */ + uuid_t gfid; + /* This structure must be exactly NFS3_FHSIZE (64) bytes long. + Having the structure shorter results in buffer overflows + during XDR decoding. + */ + unsigned char padding[NFS3_FHSIZE - GF_NFSFH_STATIC_SIZE]; } __attribute__((__packed__)); +#define GF_NFS3FH_STATIC_INITIALIZER {{0},} extern uint32_t nfs3_fh_compute_size (struct nfs3_fh *fh); -extern int -nfs3_fh_hash_index_is_beyond (struct nfs3_fh *fh, int hashidx); - extern uint16_t -nfs3_fh_hash_entry (ino_t ino, uint64_t gen); +nfs3_fh_hash_entry (uuid_t gfid); extern int nfs3_fh_validate (struct nfs3_fh *fh); -extern xlator_t * -nfs3_fh_to_xlator (xlator_list_t *cl, struct nfs3_fh *fh); - extern struct nfs3_fh -nfs3_fh_build_root_fh (xlator_list_t *cl, xlator_t *xl, struct iatt buf); +nfs3_fh_build_indexed_root_fh (xlator_list_t *cl, xlator_t *xl); extern int nfs3_fh_is_root_fh (struct nfs3_fh *fh); @@ -97,9 +88,16 @@ extern void nfs3_log_fh (struct nfs3_fh *fh); extern void -nfs3_fh_to_str (struct nfs3_fh *fh, char *str); +nfs3_fh_to_str (struct nfs3_fh *fh, char *str, size_t len); extern int nfs3_fh_build_parent_fh (struct nfs3_fh *child, struct iatt *newstat, struct nfs3_fh *newfh); + +extern struct nfs3_fh +nfs3_fh_build_uuid_root_fh (uuid_t volumeid); + +extern int +nfs3_build_fh (inode_t *inode, uuid_t exportid, struct nfs3_fh *newfh); + #endif |