ceph: fix endian conversions for ceph_pg

The endian conversions don't quite work with the old union ceph_pg.  Just
make it a regular struct, and make each field __le.  This is simpler and it
has the added bonus of actually working.

Signed-off-by: Sage Weil <sage@newdream.net>

5 files changed, 75 insertions, 55 deletions

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index e4f99eff5d9..4c33e19fc24 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -99,7 +99,7 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
         u64 len = 1, olen;
         u64 tmp;
         struct ceph_object_layout ol;
-        union ceph_pg pgid;
+        struct ceph_pg pgid;
 
         /* copy and validate */
         if (copy_from_user(&dl, arg, sizeof(dl)))
@@ -121,7 +121,7 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
         ceph_calc_object_layout(&ol, dl.object_name, &ci->i_layout,
                                 osdc->osdmap);
 
-        pgid.pg64 = le64_to_cpu(ol.ol_pgid);
+        pgid = ol.ol_pgid;
         dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
         if (dl.osd >= 0) {
                 struct ceph_entity_addr *a =
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index 7dc0f6299a5..7db14ba6261 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -520,7 +520,7 @@ static int __map_osds(struct ceph_osd_client *osdc,
                       struct ceph_osd_request *req)
 {
         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
-        union ceph_pg pgid;
+        struct ceph_pg pgid;
         int o = -1;
         int err;
         struct ceph_osd *newosd = NULL;
@@ -530,7 +530,7 @@ static int __map_osds(struct ceph_osd_client *osdc,
                                       &req->r_file_layout, osdc->osdmap);
         if (err)
                 return err;
-        pgid.pg64 = le64_to_cpu(reqhead->layout.ol_pgid);
+        pgid = reqhead->layout.ol_pgid;
         o = ceph_calc_pg_primary(osdc->osdmap, pgid);
 
         if ((req->r_osd && req->r_osd->o_osd == o &&
@@ -538,8 +538,8 @@ static int __map_osds(struct ceph_osd_client *osdc,
             (req->r_osd == NULL && o == -1))
                 return 0;  /* no change */
 
-        dout("map_osds tid %llu pgid %llx pool %d osd%d (was osd%d)\n",
-             req->r_tid, pgid.pg64, pgid.pg.pool, o,
+        dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
+             req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
              req->r_osd ? req->r_osd->o_osd : -1);
 
         if (req->r_osd) {
diff --git a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
index cd7bb265d78..8b0cd110750 100644
--- a/fs/ceph/osdmap.c
+++ b/fs/ceph/osdmap.c
@@ -366,19 +366,33 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 /*
  * Insert a new pg_temp mapping
  */
+static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
+{
+        u64 a = *(u64 *)&l;
+        u64 b = *(u64 *)&r;
+
+        if (a < b)
+                return -1;
+        if (a > b)
+                return 1;
+        return 0;
+}
+
 static int __insert_pg_mapping(struct ceph_pg_mapping *new,
                                struct rb_root *root)
 {
         struct rb_node **p = &root->rb_node;
         struct rb_node *parent = NULL;
         struct ceph_pg_mapping *pg = NULL;
+        int c;
 
         while (*p) {
                 parent = *p;
                 pg = rb_entry(parent, struct ceph_pg_mapping, node);
-                if (new->pgid < pg->pgid)
+                c = pgid_cmp(new->pgid, pg->pgid);
+                if (c < 0)
                         p = &(*p)->rb_left;
-                else if (new->pgid > pg->pgid)
+                else if (c > 0)
                         p = &(*p)->rb_right;
                 else
                         return -EEXIST;
@@ -467,11 +481,11 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
         ceph_decode_32_safe(p, end, len, bad);
         for (i = 0; i < len; i++) {
                 int n, j;
-                u64 pgid;
+                struct ceph_pg pgid;
                 struct ceph_pg_mapping *pg;
 
                 ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
-                pgid = ceph_decode_64(p);
+                ceph_decode_copy(p, &pgid, sizeof(pgid));
                 n = ceph_decode_32(p);
                 ceph_decode_need(p, end, n * sizeof(u32), bad);
                 pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
@@ -487,7 +501,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
                 err = __insert_pg_mapping(pg, &map->pg_temp);
                 if (err)
                         goto bad;
-                dout(" added pg_temp %llx len %d\n", pgid, len);
+                dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid, len);
         }
 
         /* crush */
@@ -659,19 +673,20 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
         while (len--) {
                 struct ceph_pg_mapping *pg;
                 int j;
-                u64 pgid;
+                struct ceph_pg pgid;
                 u32 pglen;
                 ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
-                pgid = ceph_decode_64(p);
+                ceph_decode_copy(p, &pgid, sizeof(pgid));
                 pglen = ceph_decode_32(p);
 
                 /* remove any? */
-                while (rbp && rb_entry(rbp, struct ceph_pg_mapping,
-                                       node)->pgid <= pgid) {
+                while (rbp && pgid_cmp(rb_entry(rbp, struct ceph_pg_mapping,
+                                                node)->pgid, pgid) <= 0) {
                         struct rb_node *cur = rbp;
                         rbp = rb_next(rbp);
                         dout(" removed pg_temp %llx\n",
-                             rb_entry(cur, struct ceph_pg_mapping, node)->pgid);
+                             *(u64 *)&rb_entry(cur, struct ceph_pg_mapping,
+                                               node)->pgid);
                         rb_erase(cur, &map->pg_temp);
                 }
 
@@ -690,14 +705,16 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
                         err = __insert_pg_mapping(pg, &map->pg_temp);
                         if (err)
                                 goto bad;
-                        dout(" added pg_temp %llx len %d\n", pgid, pglen);
+                        dout(" added pg_temp %llx len %d\n", *(u64 *)&pgid,
+                             pglen);
                 }
         }
         while (rbp) {
                 struct rb_node *cur = rbp;
                 rbp = rb_next(rbp);
                 dout(" removed pg_temp %llx\n",
-                     rb_entry(cur, struct ceph_pg_mapping, node)->pgid);
+                     *(u64 *)&rb_entry(cur, struct ceph_pg_mapping,
+                                       node)->pgid);
                 rb_erase(cur, &map->pg_temp);
         }
 
@@ -782,16 +799,19 @@ int ceph_calc_object_layout(struct ceph_object_layout *ol,
                             struct ceph_osdmap *osdmap)
 {
         unsigned num, num_mask;
-        union ceph_pg pgid;
+        struct ceph_pg pgid;
         s32 preferred = (s32)le32_to_cpu(fl->fl_pg_preferred);
         int poolid = le32_to_cpu(fl->fl_pg_pool);
         struct ceph_pg_pool_info *pool;
+        unsigned ps;
 
         if (poolid >= osdmap->num_pools)
                 return -EIO;
-        pool = &osdmap->pg_pool[poolid];
 
+        pool = &osdmap->pg_pool[poolid];
+        ps = ceph_full_name_hash(oid, strlen(oid));
         if (preferred >= 0) {
+                ps += preferred;
                 num = le32_to_cpu(pool->v.lpg_num);
                 num_mask = pool->lpg_num_mask;
         } else {
@@ -799,22 +819,17 @@ int ceph_calc_object_layout(struct ceph_object_layout *ol,
                 num_mask = pool->pg_num_mask;
         }
 
-        pgid.pg64 = 0;   /* start with it zeroed out */
-        pgid.pg.ps = ceph_full_name_hash(oid, strlen(oid));
-        pgid.pg.preferred = preferred;
-        if (preferred >= 0)
-                pgid.pg.ps += preferred;
-        pgid.pg.pool = le32_to_cpu(fl->fl_pg_pool);
+        pgid.ps = cpu_to_le16(ps);
+        pgid.preferred = cpu_to_le16(preferred);
+        pgid.pool = fl->fl_pg_pool;
         if (preferred >= 0)
-                dout("calc_object_layout '%s' pgid %d.%xp%d (%llx)\n", oid,
-                     pgid.pg.pool, pgid.pg.ps, (int)preferred, pgid.pg64);
+                dout("calc_object_layout '%s' pgid %d.%xp%d\n", oid, poolid, ps,
+                     (int)preferred);
         else
-                dout("calc_object_layout '%s' pgid %d.%x (%llx)\n", oid,
-                     pgid.pg.pool, pgid.pg.ps, pgid.pg64);
+                dout("calc_object_layout '%s' pgid %d.%x\n", oid, poolid, ps);
 
-        ol->ol_pgid = cpu_to_le64(pgid.pg64);
+        ol->ol_pgid = pgid;
         ol->ol_stripe_unit = fl->fl_object_stripe_unit;
-
         return 0;
 }
 
@@ -822,21 +837,24 @@ int ceph_calc_object_layout(struct ceph_object_layout *ol,
  * Calculate raw osd vector for the given pgid.  Return pointer to osd
  * array, or NULL on failure.
  */
-static int *calc_pg_raw(struct ceph_osdmap *osdmap, union ceph_pg pgid,
+static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
                         int *osds, int *num)
 {
         struct rb_node *n = osdmap->pg_temp.rb_node;
         struct ceph_pg_mapping *pg;
         struct ceph_pg_pool_info *pool;
         int ruleno;
-        unsigned pps; /* placement ps */
+        unsigned poolid, ps, pps;
+        int preferred;
+        int c;
 
         /* pg_temp? */
         while (n) {
                 pg = rb_entry(n, struct ceph_pg_mapping, node);
-                if (pgid.pg64 < pg->pgid)
+                c = pgid_cmp(pgid, pg->pgid);
+                if (c < 0)
                         n = n->rb_left;
-                else if (pgid.pg64 > pg->pgid)
+                else if (c > 0)
                         n = n->rb_right;
                 else {
                         *num = pg->len;
@@ -845,36 +863,40 @@ static int *calc_pg_raw(struct ceph_osdmap *osdmap, union ceph_pg pgid,
         }
 
         /* crush */
-        if (pgid.pg.pool >= osdmap->num_pools)
+        poolid = le32_to_cpu(pgid.pool);
+        ps = le16_to_cpu(pgid.ps);
+        preferred = (s16)le16_to_cpu(pgid.preferred);
+
+        if (poolid >= osdmap->num_pools)
                 return NULL;
-        pool = &osdmap->pg_pool[pgid.pg.pool];
+        pool = &osdmap->pg_pool[poolid];
         ruleno = crush_find_rule(osdmap->crush, pool->v.crush_ruleset,
                                  pool->v.type, pool->v.size);
         if (ruleno < 0) {
                 pr_err("no crush rule pool %d type %d size %d\n",
-                       pgid.pg.pool, pool->v.type, pool->v.size);
+                       poolid, pool->v.type, pool->v.size);
                 return NULL;
         }
 
-        if (pgid.pg.preferred >= 0)
-                pps = ceph_stable_mod(pgid.pg.ps,
+        if (preferred >= 0)
+                pps = ceph_stable_mod(ps,
                                       le32_to_cpu(pool->v.lpgp_num),
                                       pool->lpgp_num_mask);
         else
-                pps = ceph_stable_mod(pgid.pg.ps,
+                pps = ceph_stable_mod(ps,
                                       le32_to_cpu(pool->v.pgp_num),
                                       pool->pgp_num_mask);
-        pps += pgid.pg.pool;
+        pps += poolid;
         *num = crush_do_rule(osdmap->crush, ruleno, pps, osds,
                              min_t(int, pool->v.size, *num),
-                             pgid.pg.preferred, osdmap->osd_weight);
+                             preferred, osdmap->osd_weight);
         return osds;
 }
 
 /*
  * Return primary osd for given pgid, or -1 if none.
  */
-int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, union ceph_pg pgid)
+int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, struct ceph_pg pgid)
 {
         int rawosds[10], *osds;
         int i, num = ARRAY_SIZE(rawosds);
diff --git a/fs/ceph/osdmap.h b/fs/ceph/osdmap.h
index 07127c6fb13..c4af8418aa0 100644
--- a/fs/ceph/osdmap.h
+++ b/fs/ceph/osdmap.h
@@ -25,7 +25,7 @@ struct ceph_pg_pool_info {
 
 struct ceph_pg_mapping {
         struct rb_node node;
-        u64 pgid;
+        struct ceph_pg pgid;
         int len;
         int osds[];
 };
@@ -118,6 +118,7 @@ extern int ceph_calc_object_layout(struct ceph_object_layout *ol,
                                    const char *oid,
                                    struct ceph_file_layout *fl,
                                    struct ceph_osdmap *osdmap);
-extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, union ceph_pg pgid);
+extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
+                                struct ceph_pg pgid);
 
 #endif
diff --git a/fs/ceph/rados.h b/fs/ceph/rados.h
index a48cf4ae391..85bdef78d14 100644
--- a/fs/ceph/rados.h
+++ b/fs/ceph/rados.h
@@ -55,13 +55,10 @@ struct ceph_timespec {
  * placement group.
  * we encode this into one __le64.
  */
-union ceph_pg {
-        __u64 pg64;
-        struct {
-                __s16 preferred; /* preferred primary osd */
-                __u16 ps;        /* placement seed */
-                __u32 pool;      /* object pool */
-        } __attribute__ ((packed)) pg;
+struct ceph_pg {
+        __le16 preferred; /* preferred primary osd */
+        __le16 ps;        /* placement seed */
+        __le32 pool;      /* object pool */
 } __attribute__ ((packed));
 
 /*
@@ -117,7 +114,7 @@ static inline int ceph_stable_mod(int x, int b, int bmask)
  * object layout - how a given object should be stored.
  */
 struct ceph_object_layout {
-        __le64 ol_pgid;           /* raw pg, with _full_ ps precision. */
+        struct ceph_pg ol_pgid;   /* raw pg, with _full_ ps precision. */
         __le32 ol_stripe_unit;    /* for per-object parity, if any */
 } __attribute__ ((packed));