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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 /libglusterfs
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 'libglusterfs')
-rw-r--r--libglusterfs/src/glusterfs.h3
-rw-r--r--libglusterfs/src/inode.c26
-rw-r--r--libglusterfs/src/inode.h1
3 files changed, 18 insertions, 12 deletions
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 8643d75..6c09e89 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -102,6 +102,7 @@
#define UUID_CANONICAL_FORM_LEN 36
#define GLUSTERFS_INTERNAL_FOP_KEY "glusterfs-internal-fop"
+#define GLUSTERFS_CREATE_MODE_KEY "glusterfs-create-mode"
#define ZR_FILE_CONTENT_STR "glusterfs.file."
#define ZR_FILE_CONTENT_STRLEN 15
@@ -320,6 +321,7 @@ struct _cmd_args {
int mac_compat;
int fopen_keep_cache;
int gid_timeout;
+ int aux_gfid_mount;
struct list_head xlator_options; /* list of xlator_option_t */
/* fuse options */
@@ -348,6 +350,7 @@ struct _cmd_args {
int brick_port;
char *brick_name;
int brick_port2;
+
};
typedef struct _cmd_args cmd_args_t;
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c
index 6f1c8ec..add686f 100644
--- a/libglusterfs/src/inode.c
+++ b/libglusterfs/src/inode.c
@@ -310,7 +310,7 @@ __inode_destroy (inode_t *inode)
goto noctx;
}
- for (index = 0; index < inode->table->xl->graph->xl_count; index++) {
+ for (index = 0; index < inode->table->ctxcount; index++) {
if (inode->_ctx[index].xl_key) {
xl = (xlator_t *)(long)inode->_ctx[index].xl_key;
old_THIS = THIS;
@@ -528,10 +528,9 @@ __inode_create (inode_table_t *table)
INIT_LIST_HEAD (&newi->hash);
INIT_LIST_HEAD (&newi->dentry_list);
- newi->_ctx = GF_CALLOC (1, (sizeof (struct _inode_ctx) *
- table->xl->graph->xl_count),
+ newi->_ctx = GF_CALLOC (1,
+ (sizeof (struct _inode_ctx) * table->ctxcount),
gf_common_mt_inode_ctx);
-
if (newi->_ctx == NULL) {
LOCK_DESTROY (&newi->lock);
mem_put (newi);
@@ -1316,6 +1315,7 @@ inode_table_new (size_t lru_limit, xlator_t *xl)
return NULL;
new->xl = xl;
+ new->ctxcount = xl->graph->xl_count + 1;
new->lru_limit = lru_limit;
@@ -1466,7 +1466,7 @@ __inode_ctx_set2 (inode_t *inode, xlator_t *xlator, uint64_t *value1_p,
if (!inode || !xlator)
return -1;
- for (index = 0; index < xlator->graph->xl_count; index++) {
+ for (index = 0; index < inode->table->ctxcount; index++) {
if (!inode->_ctx[index].xl_key) {
if (set_idx == -1)
set_idx = index;
@@ -1523,12 +1523,12 @@ __inode_ctx_get2 (inode_t *inode, xlator_t *xlator, uint64_t *value1,
if (!inode || !xlator)
return -1;
- for (index = 0; index < xlator->graph->xl_count; index++) {
+ for (index = 0; index < inode->table->ctxcount; index++) {
if (inode->_ctx[index].xl_key == xlator)
break;
}
- if (index == xlator->graph->xl_count) {
+ if (index == inode->table->ctxcount) {
ret = -1;
goto out;
}
@@ -1575,12 +1575,13 @@ inode_ctx_del2 (inode_t *inode, xlator_t *xlator, uint64_t *value1,
LOCK (&inode->lock);
{
- for (index = 0; index < xlator->graph->xl_count; index++) {
+ for (index = 0; index < inode->table->ctxcount;
+ index++) {
if (inode->_ctx[index].xl_key == xlator)
break;
}
- if (index == xlator->graph->xl_count) {
+ if (index == inode->table->ctxcount) {
ret = -1;
goto unlock;
}
@@ -1628,14 +1629,15 @@ inode_dump (inode_t *inode, char *prefix)
gf_proc_dump_write("ref", "%u", inode->ref);
gf_proc_dump_write("ia_type", "%d", inode->ia_type);
if (inode->_ctx) {
- inode_ctx = GF_CALLOC (inode->table->xl->graph->xl_count,
+ inode_ctx = GF_CALLOC (inode->table->ctxcount,
sizeof (*inode_ctx),
gf_common_mt_inode_ctx);
if (inode_ctx == NULL) {
goto unlock;
}
- for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
+ for (i = 0; i < inode->table->ctxcount;
+ i++) {
inode_ctx[i] = inode->_ctx[i];
}
}
@@ -1652,7 +1654,7 @@ unlock:
UNLOCK(&inode->lock);
if (inode_ctx && (dump_options.xl_options.dump_inodectx == _gf_true)) {
- for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
+ for (i = 0; i < inode->table->ctxcount; i++) {
if (inode_ctx[i].xl_key) {
xl = (xlator_t *)(long)inode_ctx[i].xl_key;
if (xl->dumpops && xl->dumpops->inodectx)
diff --git a/libglusterfs/src/inode.h b/libglusterfs/src/inode.h
index 199ce44..cf766a3 100644
--- a/libglusterfs/src/inode.h
+++ b/libglusterfs/src/inode.h
@@ -56,6 +56,7 @@ struct _inode_table {
struct mem_pool *inode_pool; /* memory pool for inodes */
struct mem_pool *dentry_pool; /* memory pool for dentrys */
struct mem_pool *fd_mem_pool; /* memory pool for fd_t */
+ int ctxcount; /* number of slots in inode->ctx */
};