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authorAnand Avati <avati@gluster.com>2010-09-03 13:58:48 +0000
committerVijay Bellur <vijay@dev.gluster.com>2010-09-04 01:45:06 -0700
commitac60a2a7f3c7b07830669e282d9fc796cbc78f38 (patch)
treee99cb728b67e18498440fd55c2ab46b0a5c16d06 /libglusterfs/src/inode.c
parent2822157056d8347518f7e1b8bf9ee04bea7286ae (diff)
gfid: changes in inode management
- incorporate usage of uuid (gfid) as the key for finding inodes - deprecate inode number/generation number based inode_get - undo code specific to generation numbers (attic list etc.) Signed-off-by: Anand V. Avati <avati@blackhole.gluster.com> Signed-off-by: Anand V. Avati <avati@amp.gluster.com> Signed-off-by: Vijay Bellur <vijay@dev.gluster.com> BUG: 971 (dynamic volume management) URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=971
Diffstat (limited to 'libglusterfs/src/inode.c')
-rw-r--r--libglusterfs/src/inode.c270
1 files changed, 59 insertions, 211 deletions
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c
index 67f4183b47b..45d151ef04b 100644
--- a/libglusterfs/src/inode.c
+++ b/libglusterfs/src/inode.c
@@ -73,34 +73,16 @@ hash_dentry (inode_t *parent, const char *name, int mod)
static int
-hash_name (ino_t par, const char *name, int mod)
+hash_gfid (uuid_t uuid, int mod)
{
- int hash = 0;
int ret = 0;
- hash = *name;
- if (hash) {
- for (name += 1; *name != '\0'; name++) {
- hash = (hash << 5) - hash + *name;
- }
- }
- ret = (hash + par) % mod;
+ ret = uuid[15] + (uuid[14] << 8);
return ret;
}
-static int
-hash_inode (ino_t ino, int mod)
-{
- int hash = 0;
-
- hash = ino % mod;
-
- return hash;
-}
-
-
static void
__dentry_hash (dentry_t *dentry)
{
@@ -173,12 +155,6 @@ __inode_unhash (inode_t *inode)
if (!inode)
return;
- if (!list_empty (&inode->hash)) {
- if (inode->in_attic)
- inode->table->attic_size--;
- inode->in_attic = 0;
- }
-
list_del_init (&inode->hash);
}
@@ -203,56 +179,13 @@ __inode_hash (inode_t *inode)
return;
table = inode->table;
- hash = hash_inode (inode->ino, table->hashsize);
+ hash = hash_gfid (inode->gfid, 65536);
list_del_init (&inode->hash);
list_add (&inode->hash, &table->inode_hash[hash]);
}
-static inode_t *
-__inode_search (inode_table_t *table, ino_t ino)
-{
- int hash = 0;
- inode_t *inode = NULL;
- inode_t *tmp = NULL;
-
- if (!table)
- return NULL;
-
- hash = hash_inode (ino, table->hashsize);
-
- list_for_each_entry (tmp, &table->inode_hash[hash], hash) {
- if (tmp->ino == ino) {
- inode = tmp;
- break;
- }
- }
-
- return inode;
-}
-
-
-static inode_t *
-__inode_search_attic (inode_table_t *table, ino_t ino, uint64_t gen)
-{
- inode_t *inode = NULL;
- inode_t *tmp = NULL;
-
- if (!table)
- return NULL;
-
- list_for_each_entry (tmp, &table->attic, hash) {
- if (tmp->ino == ino && tmp->generation == gen) {
- inode = tmp;
- break;
- }
- }
-
- return inode;
-}
-
-
static dentry_t *
__dentry_search_for_inode (inode_t *inode, ino_t par, const char *name)
{
@@ -273,47 +206,6 @@ __dentry_search_for_inode (inode_t *inode, ino_t par, const char *name)
}
-dentry_t *
-dentry_search_for_inode (inode_t *inode, ino_t par, const char *name)
-{
- dentry_t *dentry = NULL;
-
- if (!inode || !name)
- return NULL;
-
- pthread_mutex_lock (&inode->table->lock);
- {
- dentry = __dentry_search_for_inode (inode, par, name);
- }
- pthread_mutex_unlock (&inode->table->lock);
-
- return dentry;
-}
-
-
-static dentry_t *
-__dentry_search (inode_table_t *table, ino_t par, const char *name)
-{
- int hash = 0;
- dentry_t *dentry = NULL;
- dentry_t *tmp = NULL;
-
- if (!table || !name)
- return NULL;
-
- hash = hash_name (par, name, table->hashsize);
-
- list_for_each_entry (tmp, &table->name_hash[hash], hash) {
- if (tmp->parent->ino == par && !strcmp (tmp->name, name)) {
- dentry = tmp;
- break;
- }
- }
-
- return dentry;
-}
-
-
static void
__inode_destroy (inode_t *inode)
{
@@ -616,35 +508,6 @@ __inode_forget (inode_t *inode, uint64_t nlookup)
}
-inode_t *
-inode_search (inode_table_t *table, ino_t ino, const char *name)
-{
- inode_t *inode = NULL;
- dentry_t *dentry = NULL;
-
- if (!table)
- return NULL;
-
- pthread_mutex_lock (&table->lock);
- {
- if (!name) {
- inode = __inode_search (table, ino);
- } else {
- dentry = __dentry_search (table, ino, name);
-
- if (dentry)
- inode = dentry->inode;
- }
-
- if (inode)
- __inode_ref (inode);
- }
- pthread_mutex_unlock (&table->lock);
-
- return inode;
-}
-
-
dentry_t *
__dentry_grep (inode_table_t *table, inode_t *parent, const char *name)
{
@@ -694,23 +557,46 @@ inode_grep (inode_table_t *table, inode_t *parent, const char *name)
inode_t *
-__inode_get (inode_table_t *table, ino_t ino, uint64_t gen)
+inode_get (inode_table_t *table, ino_t ino, uint64_t gen)
+{
+ return NULL;
+}
+
+
+static int
+__is_root_gfid (uuid_t gfid)
+{
+ uuid_t root;
+ int ret;
+
+ memset (root, 0, 16);
+ root[15] = 1;
+
+ ret = uuid_compare (gfid, root);
+
+ return ret;
+}
+
+
+inode_t *
+__inode_find (inode_table_t *table, uuid_t gfid)
{
inode_t *inode = NULL;
+ inode_t *tmp = NULL;
+ int hash = 0;
if (!table)
- return NULL;
-
- if (ino == 1) {
- inode = table->root;
goto out;
- }
- inode = __inode_search (table, ino);
+ if (__is_root_gfid (gfid) == 0)
+ return table->root;
+
+ hash = hash_gfid (gfid, 65536);
- if (gen) {
- if (!inode || inode->generation != gen) {
- inode = __inode_search_attic (table, ino, gen);
+ list_for_each_entry (tmp, &table->inode_hash[hash], hash) {
+ if (uuid_compare (tmp->gfid, gfid) == 0) {
+ inode = tmp;
+ break;
}
}
@@ -720,7 +606,7 @@ out:
inode_t *
-inode_get (inode_table_t *table, ino_t ino, uint64_t gen)
+inode_find (inode_table_t *table, uuid_t gfid)
{
inode_t *inode = NULL;
@@ -729,7 +615,7 @@ inode_get (inode_table_t *table, ino_t ino, uint64_t gen)
pthread_mutex_lock (&table->lock);
{
- inode = __inode_get (table, ino, gen);
+ inode = __inode_find (table, gfid);
if (inode)
__inode_ref (inode);
}
@@ -739,36 +625,6 @@ inode_get (inode_table_t *table, ino_t ino, uint64_t gen)
}
-static int
-__inode_atticize (inode_t *inode)
-{
- inode_table_t *table = NULL;
-
- if (!inode)
- return -1;
-
- table = inode->table;
-
- __inode_unhash (inode);
-
- list_add (&inode->hash, &table->attic);
- inode->in_attic = 1;
- table->attic_size++;
-
- return 0;
-}
-
-
-uint64_t
-inode_gen_from_stat (struct iatt *iatt)
-{
- if (!iatt)
- return 0;
-
- return (uint64_t) iatt->ia_gen;
-}
-
-
static inode_t *
__inode_link (inode_t *inode, inode_t *parent, const char *name,
struct iatt *iatt)
@@ -779,7 +635,7 @@ __inode_link (inode_t *inode, inode_t *parent, const char *name,
inode_table_t *table = NULL;
inode_t *link_inode = NULL;
- if (!inode || !iatt)
+ if (!inode)
return NULL;
table = inode->table;
@@ -788,31 +644,21 @@ __inode_link (inode_t *inode, inode_t *parent, const char *name,
link_inode = inode;
- if (iatt->ia_ino == 1 && inode != table->root) {
- gf_log (table->name, GF_LOG_ERROR,
- "inode_link called with iatt->ia_ino = 1. "
- "inode=%"PRId64"/%"PRId64 "parent=%"PRId64"/%"PRId64
- " name=%s",
- inode ? inode->generation:0 , inode ? inode->ino:0,
- parent ? parent->generation:0 , parent ? parent->ino:0,
- name);
- return link_inode;
- }
-
if (!__is_inode_hashed (inode)) {
+ if (!iatt)
+ return NULL;
+
+ if (uuid_is_null (iatt->ia_gfid))
+ return NULL;
+
+ uuid_copy (inode->gfid, iatt->ia_gfid);
inode->ino = iatt->ia_ino;
inode->ia_type = iatt->ia_type;
- inode->generation = inode_gen_from_stat (iatt);
- old_inode = __inode_search (table, inode->ino);
+ old_inode = __inode_find (table, inode->gfid);
if (old_inode) {
- if (old_inode->generation < inode->generation) {
- __inode_atticize (old_inode);
- __inode_hash (inode);
- } else {
- link_inode = old_inode;
- }
+ link_inode = old_inode;
} else {
__inode_hash (inode);
}
@@ -842,7 +688,7 @@ inode_link (inode_t *inode, inode_t *parent, const char *name,
inode_table_t *table = NULL;
inode_t *linked_inode = NULL;
- if (!inode || !iatt)
+ if (!inode)
return NULL;
table = inode->table;
@@ -1163,14 +1009,15 @@ inode_table_prune (inode_table_t *table)
static void
__inode_table_init_root (inode_table_t *table)
{
- inode_t *root = NULL;
- struct iatt iatt = {0, };
+ inode_t *root = NULL;
+ struct iatt iatt = {0, };
if (!table)
return;
root = __inode_create (table);
+ iatt.ia_gfid[15] = 1;
iatt.ia_ino = 1;
iatt.ia_type = IA_IFDIR;
@@ -1210,7 +1057,7 @@ inode_table_new (size_t lru_limit, xlator_t *xl)
return NULL;
}
- new->inode_hash = (void *)GF_CALLOC (new->hashsize,
+ new->inode_hash = (void *)GF_CALLOC (65536,
sizeof (struct list_head),
gf_common_mt_list_head);
if (!new->inode_hash) {
@@ -1234,19 +1081,18 @@ inode_table_new (size_t lru_limit, xlator_t *xl)
GF_FREE (new);
}
- for (i=0; i<new->hashsize; i++) {
+ for (i = 0; i < 65536; i++) {
INIT_LIST_HEAD (&new->inode_hash[i]);
}
- for (i=0; i<new->hashsize; i++) {
+ for (i = 0; i < new->hashsize; i++) {
INIT_LIST_HEAD (&new->name_hash[i]);
}
INIT_LIST_HEAD (&new->active);
INIT_LIST_HEAD (&new->lru);
INIT_LIST_HEAD (&new->purge);
- INIT_LIST_HEAD (&new->attic);
ret = gf_asprintf (&new->name, "%s/inode", xl->name);
if (-1 == ret) {
@@ -1509,6 +1355,7 @@ inode_dump (inode_t *inode, char *prefix)
int ret = -1;
xlator_t *xl = NULL;
int i = 0;
+ char uuidbuf[256];
if (!inode)
return;
@@ -1521,10 +1368,11 @@ inode_dump (inode_t *inode, char *prefix)
return;
}
+ uuid_unparse (inode->gfid, uuidbuf);
+ gf_proc_dump_build_key(key, prefix, "gfid");
+ gf_proc_dump_write(key, "%s", uuidbuf);
gf_proc_dump_build_key(key, prefix, "nlookup");
gf_proc_dump_write(key, "%ld", inode->nlookup);
- gf_proc_dump_build_key(key, prefix, "generation");
- gf_proc_dump_write(key, "%ld", inode->generation);
gf_proc_dump_build_key(key, prefix, "ref");
gf_proc_dump_write(key, "%u", inode->ref);
gf_proc_dump_build_key(key, prefix, "ino");