ceph: implement hidden per-field ceph.*.layout.* vxattrs
Allow individual fields of the layout to be fetched via getxattr.
The ceph.dir.layout.* vxattr with "disappear" if the exists_cb
indicates there no dir layout set.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Sam Lang <sam.lang@inktank.com>
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index f3c4fe7..2135817 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -77,6 +77,46 @@
return ret;
}
+static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
+ char *val, size_t size)
+{
+ return snprintf(val, size, "%lld",
+ (unsigned long long)ceph_file_layout_su(ci->i_layout));
+}
+
+static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
+ char *val, size_t size)
+{
+ return snprintf(val, size, "%lld",
+ (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
+}
+
+static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
+ char *val, size_t size)
+{
+ return snprintf(val, size, "%lld",
+ (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
+}
+
+static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
+ char *val, size_t size)
+{
+ int ret;
+ struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
+ struct ceph_osd_client *osdc = &fsc->client->osdc;
+ s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
+ const char *pool_name;
+
+ down_read(&osdc->map_sem);
+ pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
+ if (pool_name)
+ ret = snprintf(val, size, "%s", pool_name);
+ else
+ ret = snprintf(val, size, "%lld", (unsigned long long)pool);
+ up_read(&osdc->map_sem);
+ return ret;
+}
+
/* directories */
static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
@@ -130,6 +170,8 @@
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
+#define CEPH_XATTR_NAME2(_type, _name, _name2) \
+ XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
#define XATTR_NAME_CEPH(_type, _name) \
{ \
@@ -140,6 +182,15 @@
.hidden = false, \
.exists_cb = NULL, \
}
+#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
+ { \
+ .name = CEPH_XATTR_NAME2(_type, _name, _field), \
+ .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
+ .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
+ .readonly = false, \
+ .hidden = true, \
+ .exists_cb = ceph_vxattrcb_layout_exists, \
+ }
static struct ceph_vxattr ceph_dir_vxattrs[] = {
{
@@ -150,6 +201,10 @@
.hidden = false,
.exists_cb = ceph_vxattrcb_layout_exists,
},
+ XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
+ XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
+ XATTR_LAYOUT_FIELD(dir, layout, object_size),
+ XATTR_LAYOUT_FIELD(dir, layout, pool),
XATTR_NAME_CEPH(dir, entries),
XATTR_NAME_CEPH(dir, files),
XATTR_NAME_CEPH(dir, subdirs),
@@ -173,6 +228,10 @@
.hidden = false,
.exists_cb = ceph_vxattrcb_layout_exists,
},
+ XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
+ XATTR_LAYOUT_FIELD(file, layout, stripe_count),
+ XATTR_LAYOUT_FIELD(file, layout, object_size),
+ XATTR_LAYOUT_FIELD(file, layout, pool),
{ 0 } /* Required table terminator */
};
static size_t ceph_file_vxattrs_name_size; /* total size of all names */