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-rw-r--r--libglusterfs/src/gf-dirent.c128
-rw-r--r--libglusterfs/src/gf-dirent.h10
-rw-r--r--libglusterfs/src/glusterfs.h2
-rw-r--r--libglusterfs/src/graph.c125
-rw-r--r--libglusterfs/src/xlator.h7
5 files changed, 271 insertions, 1 deletions
diff --git a/libglusterfs/src/gf-dirent.c b/libglusterfs/src/gf-dirent.c
index f6fd3ab54ee..b5f395afc36 100644
--- a/libglusterfs/src/gf-dirent.c
+++ b/libglusterfs/src/gf-dirent.c
@@ -21,6 +21,134 @@
#include "compat.h"
#include "xlator.h"
+#define ONE 1ULL
+#define PRESENT_D_OFF_BITS 63
+#define BACKEND_D_OFF_BITS 63
+#define TOP_BIT (ONE << (PRESENT_D_OFF_BITS - 1))
+#define MASK (~0ULL)
+#define SHIFT_BITS (max (0, (BACKEND_D_OFF_BITS - PRESENT_D_OFF_BITS + 1)))
+#define PRESENT_MASK (MASK >> (64 - PRESENT_D_OFF_BITS))
+
+static uint64_t
+bits_for (uint64_t num)
+{
+ uint64_t bits = 0, ctrl = 1;
+
+ while (ctrl < num) {
+ ctrl *= 2;
+ bits++;
+ }
+
+ return bits;
+}
+
+int
+gf_deitransform(xlator_t *this,
+ uint64_t offset)
+{
+ int cnt = 0;
+ int max = 0;
+ int max_bits = 0;
+ uint64_t off_mask = 0;
+ uint64_t host_mask = 0;
+
+ max = glusterfs_get_leaf_count(this->graph);
+
+ if (max == 1) {
+ cnt = 0;
+ goto out;
+ }
+
+ if (offset & TOP_BIT) {
+ /* HUGE d_off */
+ max_bits = bits_for (max);
+ off_mask = (MASK << max_bits);
+ host_mask = ~(off_mask);
+
+ cnt = offset & host_mask;
+ } else {
+ /* small d_off */
+ cnt = offset % max;
+ }
+out:
+ return cnt;
+}
+
+uint64_t
+gf_dirent_orig_offset(xlator_t *this,
+ uint64_t offset)
+{
+ int max = 0;
+ int max_bits = 0;
+ uint64_t off_mask = 0;
+ uint64_t orig_offset;
+
+ max = glusterfs_get_leaf_count(this->graph);
+
+ if (max == 1) {
+ orig_offset = offset;
+ goto out;
+ }
+
+ if (offset & TOP_BIT) {
+ /* HUGE d_off */
+ max_bits = bits_for (max);
+ off_mask = (MASK << max_bits);
+ orig_offset = ((offset & ~TOP_BIT) & off_mask) << SHIFT_BITS;
+ } else {
+ /* small d_off */
+ orig_offset = offset / max;
+ }
+out:
+ return orig_offset;
+}
+
+int
+gf_itransform (xlator_t *this, uint64_t x, uint64_t *y_p, int client_id)
+{
+ int max = 0;
+ uint64_t y = 0;
+ uint64_t hi_mask = 0;
+ uint64_t off_mask = 0;
+ int max_bits = 0;
+
+ if (x == ((uint64_t) -1)) {
+ y = (uint64_t) -1;
+ goto out;
+ }
+
+ if (!x) {
+ y = 0;
+ goto out;
+ }
+
+ max = glusterfs_get_leaf_count(this->graph);
+
+ if (max == 1) {
+ y = x;
+ goto out;
+ }
+
+ max_bits = bits_for (max);
+
+ hi_mask = ~(PRESENT_MASK >> (max_bits + 1));
+
+ if (x & hi_mask) {
+ /* HUGE d_off */
+ off_mask = MASK << max_bits;
+ y = TOP_BIT | ((x >> SHIFT_BITS) & off_mask) | client_id;
+ } else {
+ /* small d_off */
+ y = ((x * max) + client_id);
+ }
+
+out:
+ if (y_p)
+ *y_p = y;
+
+ return 0;
+}
+
gf_dirent_t *
gf_dirent_for_name (const char *name)
{
diff --git a/libglusterfs/src/gf-dirent.h b/libglusterfs/src/gf-dirent.h
index 4c1ff0b1684..07c605f82b0 100644
--- a/libglusterfs/src/gf-dirent.h
+++ b/libglusterfs/src/gf-dirent.h
@@ -22,6 +22,16 @@
#define gf_dirent_size(name) (sizeof (gf_dirent_t) + strlen (name) + 1)
+int
+gf_deitransform(xlator_t *this, uint64_t y);
+
+int
+gf_itransform (xlator_t *this, uint64_t x, uint64_t *y_p, int client_id);
+
+uint64_t
+gf_dirent_orig_offset (xlator_t *this, uint64_t offset);
+
+
struct _dir_entry_t {
struct _dir_entry_t *next;
char *name;
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index a810f3a81f0..791e6dc5fd8 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -452,6 +452,7 @@ struct _glusterfs_graph {
int id; /* Used in logging */
int used; /* Should be set when fuse gets
first CHILD_UP */
+ uint32_t leaf_count;
uint32_t volfile_checksum;
};
typedef struct _glusterfs_graph glusterfs_graph_t;
@@ -617,6 +618,7 @@ int glusterfs_graph_prepare (glusterfs_graph_t *graph, glusterfs_ctx_t *ctx);
int glusterfs_graph_destroy_residual (glusterfs_graph_t *graph);
int glusterfs_graph_deactivate (glusterfs_graph_t *graph);
int glusterfs_graph_destroy (glusterfs_graph_t *graph);
+int glusterfs_get_leaf_count (glusterfs_graph_t *graph);
int glusterfs_graph_activate (glusterfs_graph_t *graph, glusterfs_ctx_t *ctx);
glusterfs_graph_t *glusterfs_graph_construct (FILE *fp);
glusterfs_graph_t *glusterfs_graph_new ();
diff --git a/libglusterfs/src/graph.c b/libglusterfs/src/graph.c
index b427740f10f..709ec3b3ce3 100644
--- a/libglusterfs/src/graph.c
+++ b/libglusterfs/src/graph.c
@@ -515,15 +515,138 @@ glusterfs_graph_prepare (glusterfs_graph_t *graph, glusterfs_ctx_t *ctx)
/* XXX: --xlator-option additions */
gf_add_cmdline_options (graph, &ctx->cmd_args);
-
return 0;
}
+static
+xlator_t *glusterfs_root(glusterfs_graph_t *graph)
+{
+ return graph->first;
+}
+
+static
+int glusterfs_is_leaf(xlator_t *xl)
+{
+ int ret = 0;
+
+ if (!xl->children)
+ ret = 1;
+
+ return ret;
+}
+
+static
+uint32_t glusterfs_count_leaves(xlator_t *xl)
+{
+ int n = 0;
+ xlator_list_t *list = NULL;
+
+ if (glusterfs_is_leaf(xl))
+ n = 1;
+ else
+ for (list = xl->children; list; list = list->next)
+ n += glusterfs_count_leaves(list->xlator);
+
+ return n;
+}
+
+int glusterfs_get_leaf_count(glusterfs_graph_t *graph)
+{
+ return graph->leaf_count;
+}
+
+static
+int _glusterfs_leaf_position(xlator_t *tgt, int *id, xlator_t *xl)
+{
+ xlator_list_t *list = NULL;
+ int found = 0;
+
+ if (xl == tgt)
+ found = 1;
+ else if (glusterfs_is_leaf(xl))
+ *id += 1;
+ else
+ for (list = xl->children; !found && list; list = list->next)
+ found = _glusterfs_leaf_position(tgt, id, list->xlator);
+
+ return found;
+}
+
+int glusterfs_leaf_position(xlator_t *tgt)
+{
+ xlator_t *root = NULL;
+ int pos = 0;
+
+ root = glusterfs_root(tgt->graph);
+
+ if (!_glusterfs_leaf_position(tgt, &pos, root))
+ pos = -1;
+
+ return pos;
+}
+
+static int
+_glusterfs_reachable_leaves(xlator_t *base, xlator_t *xl, dict_t *leaves)
+{
+ xlator_list_t *list = NULL;
+ int err = 1;
+ int pos = 0;
+ char strpos[6];
+
+ if (glusterfs_is_leaf(xl)) {
+ pos = glusterfs_leaf_position(xl);
+ if (pos < 0)
+ goto out;
+ sprintf(strpos, "%d", pos);
+
+ err = dict_set_static_ptr(leaves, strpos, base);
+
+ } else {
+ for (err = 0, list = xl->children;
+ !err && list;
+ list = list->next)
+ err = _glusterfs_reachable_leaves(base, list->xlator,
+ leaves);
+ }
+
+out:
+ return err;
+}
+
+/*
+ * This function determines which leaves are children (or grandchildren)
+ * of the given base. The base may have multiple sub volumes. Each sub
+ * volumes in turn may have sub volumes.. until the leaves are reached.
+ * Each leaf is numbered 1,2,3,...etc.
+ *
+ * The base translator calls this function to see which of *its* subvolumes
+ * it would forward an FOP to, to *get to* a particular leaf.
+ * That information is built into the "leaves" dictionary.
+ * key:destination leaf# -> value:base subvolume xlator.
+ */
+
+int
+glusterfs_reachable_leaves(xlator_t *base, dict_t *leaves)
+{
+ xlator_list_t *list = NULL;
+ int err = 0;
+
+ for (list = base->children; !err && list; list = list->next)
+ err = _glusterfs_reachable_leaves(list->xlator,
+ list->xlator, leaves);
+
+ return err;
+}
int
glusterfs_graph_activate (glusterfs_graph_t *graph, glusterfs_ctx_t *ctx)
{
int ret = 0;
+ xlator_t *root = NULL;
+
+ root = glusterfs_root(graph);
+
+ graph->leaf_count = glusterfs_count_leaves(root);
/* XXX: all xlator options validation */
ret = glusterfs_graph_validate_options (graph);
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index 733f6cf47ab..5a71ceb3f31 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -978,4 +978,11 @@ glusterfs_volfile_reconfigure (int oldvollen, FILE *newvolfile_fp,
int
loc_touchup (loc_t *loc, const char *name);
+
+int
+glusterfs_leaf_position(xlator_t *tgt);
+
+int
+glusterfs_reachable_leaves(xlator_t *base, dict_t *leaves);
+
#endif /* _XLATOR_H */
generated by cgit (git 2.34.1) at 2024-06-28 16:34:20 +0000