# HG changeset patch
# User Tero Marttila <terom@fixme.fi>
# Date 1224248975 -10800
# Node ID 90e14e0df133e8f076b8c615c2ca9e5d1eb35cb0
# Parent  7804cd7b5cd54674c166dfb1b0519b0393b263b6
working readlink

diff -r 7804cd7b5cd5 -r 90e14e0df133 Makefile
--- a/Makefile	Fri Oct 17 02:04:03 2008 +0300
+++ b/Makefile	Fri Oct 17 16:09:35 2008 +0300
@@ -20,7 +20,7 @@
 
 # complex modules
 EVSQL_OBJS = obj/evsql/evsql.o obj/evsql/util.o obj/evpq.o
-DBFS_OBJS = obj/dbfs/dbfs.o obj/dbfs/common.o obj/dbfs/core.o obj/dbfs/op_base.o obj/dbfs/dirop.o obj/dirbuf.o obj/dbfs/fileop.o obj/dbfs/attr.o
+DBFS_OBJS = obj/dbfs/dbfs.o obj/dbfs/common.o obj/dbfs/core.o obj/dbfs/op_base.o obj/dbfs/dirop.o obj/dirbuf.o obj/dbfs/fileop.o obj/dbfs/attr.o obj/dbfs/link.o
 
 # first target
 all: ${BIN_PATHS}
diff -r 7804cd7b5cd5 -r 90e14e0df133 doc/fuse_db.sql
--- a/doc/fuse_db.sql	Fri Oct 17 02:04:03 2008 +0300
+++ b/doc/fuse_db.sql	Fri Oct 17 16:09:35 2008 +0300
@@ -25,3 +25,4 @@
 CREATE FUNCTION lo_pwrite (IN fd int4, IN buf bytea, IN "off" int4) RETURNS int4 LANGUAGE SQL STRICT AS 'select lo_lseek($1, $3, 0); select lowrite($1, $2);';
 CREATE FUNCTION lo_otruncate (IN oid, IN len int4) RETURNS oid LANGUAGE SQL STRICT AS 'select lo_truncate(lo_open($1, 393216), $2); select $1;';
 
+ALTER TABLE inodes ADD COLUMN symlink varchar(512);
diff -r 7804cd7b5cd5 -r 90e14e0df133 src/dbfs/attr.c
--- a/src/dbfs/attr.c	Fri Oct 17 02:04:03 2008 +0300
+++ b/src/dbfs/attr.c	Fri Oct 17 16:09:35 2008 +0300
@@ -29,13 +29,13 @@
         
     INFO("[dbfs.getattr %p] -> ino=%lu, stat follows", req, (unsigned long int) ino);
     
+    // inode
+    st.st_ino = ino;
+
     // stat attrs
     if ((err = _dbfs_stat_info(&st, res, 0, 1)))
         goto error;
 
-    // XXX: we don't have the ino
-    st.st_ino = ino;
-
     // reply
     if ((err = fuse_reply_attr(req, &st, st.st_nlink ? CACHE_TIMEOUT : 0)))
         EERROR(err, "fuse_reply_entry");
diff -r 7804cd7b5cd5 -r 90e14e0df133 src/dbfs/common.c
--- a/src/dbfs/common.c	Fri Oct 17 02:04:03 2008 +0300
+++ b/src/dbfs/common.c	Fri Oct 17 16:09:35 2008 +0300
@@ -10,6 +10,9 @@
 
     if (!strcmp(type, "REG"))
         return S_IFREG;
+    
+    if (!strcmp(type, "LNK"))
+        return S_IFLNK;
 
     else {
         WARNING("[dbfs] weird mode-type: %s", type);
diff -r 7804cd7b5cd5 -r 90e14e0df133 src/dbfs/dbfs.c
--- a/src/dbfs/dbfs.c	Fri Oct 17 02:04:03 2008 +0300
+++ b/src/dbfs/dbfs.c	Fri Oct 17 16:09:35 2008 +0300
@@ -11,9 +11,10 @@
     .destroy        = dbfs_destroy,
     
     .lookup         = dbfs_lookup,
-
+    // .forget
     .getattr        = dbfs_getattr,
     .setattr        = dbfs_setattr,
+    .readlink       = dbfs_readlink,
 
     .open           = dbfs_open,
     .read           = dbfs_read,
diff -r 7804cd7b5cd5 -r 90e14e0df133 src/dbfs/link.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dbfs/link.c	Fri Oct 17 16:09:35 2008 +0300
@@ -0,0 +1,79 @@
+#include "dbfs.h"
+
+#include "../lib/log.h"
+
+void _dbfs_readlink_res (const struct evsql_result_info *res, void *arg) {
+    struct fuse_req *req = arg;
+    int err = 0;
+    
+    uint32_t ino;
+    const char *type, *link;
+
+    // check the results
+    if ((err = _dbfs_check_res(res, 1, 3)))
+        SERROR(err = (err ==  1 ? ENOENT : EIO));
+        
+    // get our data
+    if (0
+        ||  evsql_result_uint32(res, 0, 0, &ino,        0 ) // inodes.ino
+        ||  evsql_result_string(res, 0, 1, &type,       0 ) // inodes.type
+        ||  evsql_result_string(res, 0, 2, &link,       1 ) // inodes.symlink
+    )
+        EERROR(err = EIO, "invalid db data");
+    
+    // is it a symlink?
+    if (_dbfs_mode(type) != S_IFLNK)
+        EERROR(err = EINVAL, "wrong type: %s", type);
+    
+    INFO("[dbfs.readlink %p] -> ino=%lu, type=%s, link=%s", req, (unsigned long int) ino, type, link);
+    
+    // reply
+    if ((err = fuse_reply_readlink(req, link)))
+        EERROR(err, "fuse_reply_readlink");
+
+error:
+    if (err && (err = fuse_reply_err(req, err)))
+        EWARNING(err, "fuse_reply_err");
+
+    // free
+    evsql_result_free(res);
+}
+
+void dbfs_readlink (struct fuse_req *req, fuse_ino_t ino) {
+    struct dbfs *ctx = fuse_req_userdata(req);
+    int err;
+    
+    INFO("[dbfs.readlink %p] ino=%lu", req, ino);
+
+    const char *sql =
+        "SELECT"
+        " inodes.ino, inodes.type, inodes.symlink"
+        " FROM inodes"
+        " WHERE inodes.ino = $1::int4";
+
+    static struct evsql_query_params params = EVSQL_PARAMS(EVSQL_FMT_BINARY) {
+        EVSQL_PARAM ( UINT32 ),
+
+        EVSQL_PARAMS_END
+    };
+
+    // build params
+    if (0
+        ||  evsql_param_uint32(&params, 0, ino)
+    )
+        SERROR(err = EIO);
+        
+    // query
+    if (evsql_query_params(ctx->db, NULL, sql, &params, _dbfs_readlink_res, req) == NULL)
+        SERROR(err = EIO);
+
+    // XXX: handle interrupts
+    
+    // wait
+    return;
+
+error:
+    if ((err = fuse_reply_err(req, err)))
+        EWARNING(err, "fuse_reply_err");
+
+}
diff -r 7804cd7b5cd5 -r 90e14e0df133 src/dbfs/ops.h
--- a/src/dbfs/ops.h	Fri Oct 17 02:04:03 2008 +0300
+++ b/src/dbfs/ops.h	Fri Oct 17 16:09:35 2008 +0300
@@ -9,11 +9,14 @@
 
 /* core.c */
 void dbfs_lookup (struct fuse_req *req, fuse_ino_t parent, const char *name);
-void dbfs_getattr (struct fuse_req *req, fuse_ino_t ino, struct fuse_file_info *fi);
 
-/* setattr.c */
+/* attr.c */
+void dbfs_getattr (struct fuse_req *req, fuse_ino_t ino, struct fuse_file_info *fi);
 void dbfs_setattr(struct fuse_req *req, fuse_ino_t ino, struct stat *attr, int to_set, struct fuse_file_info *fi);
 
+/* symlink.c */
+void dbfs_readlink (struct fuse_req *req, fuse_ino_t ino);
+
 /* dirop.c */
 void dbfs_opendir (struct fuse_req *req, fuse_ino_t ino, struct fuse_file_info *fi);
 void dbfs_readdir (struct fuse_req *req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi);