[PATCH] implemented DAV copy hardlinks

[Roman Arutyunyan]

Новая версия патча. Вроде учел все замечания.
Опция называется 'dav_copy_hardlink'.
Если у кого-то есть идеи получше касательно названия, предлагайте.
---
 src/core/ngx_file.c                    |   21 +++++++++++++++++++++
 src/core/ngx_file.h                    |    2 ++
 src/http/modules/ngx_http_dav_module.c |   17 +++++++++++++++++
 3 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/src/core/ngx_file.c b/src/core/ngx_file.c
index d9b30f8..c960f04 100644
--- a/src/core/ngx_file.c
+++ b/src/core/ngx_file.c
@@ -608,6 +608,7 @@ ngx_ext_rename_file(ngx_str_t *src, ngx_str_t *to, ngx_ext_rename_file_t *ext)
         cf.access = ext->access;
         cf.time = ext->time;
         cf.log = ext->log;
+        cf.hardlink = 0;
 
         name = ngx_alloc(to->len + 1 + 10 + 1, ext->log);
         if (name == NULL) {
@@ -681,6 +682,24 @@ ngx_copy_file(u_char *from, u_char *to, ngx_copy_file_t *cf)
     rc = NGX_ERROR;
     buf = NULL;
     nfd = NGX_INVALID_FILE;
+    fd = NGX_INVALID_FILE;
+
+#ifndef NGX_WIN32
+    if (cf->hardlink &&
+        link((const char *) from, (const char *) to) == NGX_OK)
+    {
+        if (chmod((const char *) to, cf->access) != NGX_OK) {
+            ngx_log_error(NGX_LOG_EMERG, cf->log, ngx_errno,
+                          "chmod() \"%s\" failed", to);
+
+            ngx_delete_file(to);
+
+            goto failed;
+        }
+
+        goto set_time;
+    }
+#endif
 
     fd = ngx_open_file(from, NGX_FILE_RDONLY, NGX_FILE_OPEN, 0);
 
@@ -763,6 +782,8 @@ ngx_copy_file(u_char *from, u_char *to, ngx_copy_file_t *cf)
         size -= n;
     }
 
+set_time:
+
     if (cf->time != -1) {
         if (ngx_set_file_time(to, nfd, cf->time) != NGX_OK) {
             ngx_log_error(NGX_LOG_ALERT, cf->log, ngx_errno,
diff --git a/src/core/ngx_file.h b/src/core/ngx_file.h
index 7023e67..81c706a 100644
--- a/src/core/ngx_file.h
+++ b/src/core/ngx_file.h
@@ -94,6 +94,8 @@ typedef struct {
     ngx_uint_t                 access;
     time_t                     time;
 
+    unsigned                   hardlink:1;
+
     ngx_log_t                 *log;
 } ngx_copy_file_t;
 
diff --git a/src/http/modules/ngx_http_dav_module.c b/src/http/modules/ngx_http_dav_module.c
index dbb17ac..f9e5daf 100644
--- a/src/http/modules/ngx_http_dav_module.c
+++ b/src/http/modules/ngx_http_dav_module.c
@@ -25,12 +25,14 @@ typedef struct {
     ngx_uint_t  access;
     ngx_uint_t  min_delete_depth;
     ngx_flag_t  create_full_put_path;
+    ngx_flag_t  hardlink;
 } ngx_http_dav_loc_conf_t;
 
 
 typedef struct {
     ngx_str_t   path;
     size_t      len;
+    unsigned    hardlink:1;
 } ngx_http_dav_copy_ctx_t;
 
 
@@ -106,6 +108,13 @@ static ngx_command_t  ngx_http_dav_commands[] = {
       offsetof(ngx_http_dav_loc_conf_t, access),
       NULL },
 
+    { ngx_string("dav_copy_hardlink"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_dav_loc_conf_t, hardlink),
+      NULL },
+
       ngx_null_command
 };
 
@@ -767,7 +776,10 @@ overwrite_done:
                                       ngx_create_dir_n, copy.path.data);
         }
 
+        dlcf = ngx_http_get_module_loc_conf(r, ngx_http_dav_module);
+
         copy.len = path.len;
+        copy.hardlink = dlcf->hardlink;
 
         tree.init_handler = NULL;
         tree.file_handler = ngx_http_dav_copy_tree_file;
@@ -818,6 +830,7 @@ overwrite_done:
         cf.access = dlcf->access;
         cf.time = ngx_file_mtime(&fi);
         cf.log = r->connection->log;
+        cf.hardlink = dlcf->hardlink;
 
         if (ngx_copy_file(path.data, copy.path.data, &cf) == NGX_OK) {
             return NGX_HTTP_NO_CONTENT;
@@ -959,6 +972,7 @@ ngx_http_dav_copy_tree_file(ngx_tree_ctx_t *ctx, ngx_str_t *path)
     cf.access = ctx->access;
     cf.time = ctx->mtime;
     cf.log = ctx->log;
+    cf.hardlink = copy->hardlink;
 
     (void) ngx_copy_file(path->data, file, &cf);
 
@@ -1096,6 +1110,7 @@ ngx_http_dav_create_loc_conf(ngx_conf_t *cf)
     conf->min_delete_depth = NGX_CONF_UNSET_UINT;
     conf->access = NGX_CONF_UNSET_UINT;
     conf->create_full_put_path = NGX_CONF_UNSET;
+    conf->hardlink = NGX_CONF_UNSET;
 
     return conf;
 }
@@ -1118,6 +1133,8 @@ ngx_http_dav_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
     ngx_conf_merge_value(conf->create_full_put_path,
                          prev->create_full_put_path, 0);
 
+    ngx_conf_merge_value(conf->hardlink, prev->hardlink, 0);
+
     return NGX_CONF_OK;
 }
 
-- 
1.7.1