From 459d5c9adf1312827b2882d54d29d396a032d62b Mon Sep 17 00:00:00 2001
From: fanyong <fanyong>
Date: Tue, 31 Oct 2006 07:25:29 +0000
Subject: [PATCH] (1) drop some comment. (2) small fix for lock using. (3)
 replace kernel flag with LUSTRE flag.

---
 lustre/mdd/mdd_object.c     | 34 +++++++++++++++++-----------------
 lustre/mdd/mdd_permission.c | 22 ++++------------------
 2 files changed, 21 insertions(+), 35 deletions(-)

diff --git a/lustre/mdd/mdd_object.c b/lustre/mdd/mdd_object.c
index a762ea3..b419783 100644
--- a/lustre/mdd/mdd_object.c
+++ b/lustre/mdd/mdd_object.c
@@ -733,9 +733,9 @@ static int mdd_attr_set(const struct lu_env *env, struct md_object *obj,
                        ma->ma_attr.la_mtime, ma->ma_attr.la_ctime);
 
         *la_copy = ma->ma_attr;
-        mdd_write_lock(env, mdd_obj);
+        mdd_read_lock(env, mdd_obj);
         rc = mdd_fix_attr(env, mdd_obj, la_copy);
-        mdd_write_unlock(env, mdd_obj);
+        mdd_read_unlock(env, mdd_obj);
         if (rc)
                 GOTO(cleanup, rc);
 
@@ -957,16 +957,16 @@ static int mdd_object_create(const struct lu_env *env,
         int rc;
         ENTRY;
 
-        rc = mdd_oc_sanity_check(env, mdd_obj, ma);
-        if (rc)
-                RETURN(rc);
-
         mdd_txn_param_build(env, mdd, MDD_TXN_OBJECT_CREATE_OP);
         handle = mdd_trans_start(env, mdd);
         if (IS_ERR(handle))
                 RETURN(PTR_ERR(handle));
 
         mdd_write_lock(env, mdd_obj);
+        rc = mdd_oc_sanity_check(env, mdd_obj, ma);
+        if (rc)
+                GOTO(unlock, rc);
+
         rc = mdd_object_create_internal(env, mdd_obj, ma, handle);
         if (rc)
                 GOTO(unlock, rc);
@@ -1098,25 +1098,24 @@ static int mdd_open_sanity_check(const struct lu_env *env,
                         RETURN(rc);
         }
 
-        /*
-         * FIFO's, sockets and device files are special: they don't
-         * actually live on the filesystem itself, and as such you
-         * can write to them even if the filesystem is read-only.
-         */
-        if (S_ISFIFO(tmp_la->la_mode) || S_ISSOCK(tmp_la->la_mode)) 
-                flag &= ~O_TRUNC;
+        if (S_ISFIFO(tmp_la->la_mode) || S_ISSOCK(tmp_la->la_mode) ||
+            S_ISBLK(tmp_la->la_mode) || S_ISCHR(tmp_la->la_mode))
+                flag &= ~MDS_OPEN_TRUNC;
 
         /*
-         * An append-only file must be opened in append mode for writing.
+         * For writing append-only file must open it with append mode.
          */
         if (mdd_is_append(obj)) {
-                if ((mode & FMODE_WRITE) && !(flag & O_APPEND))
+                if ((flag & FMODE_WRITE) && !(flag & MDS_OPEN_APPEND))
                         RETURN(-EPERM);
-                if (flag & O_TRUNC)
+                if (flag & MDS_OPEN_TRUNC)
                         RETURN(-EPERM);
         }
 
-        /* O_NOATIME can only be set by the owner or superuser */
+#if 0
+        /*
+         * Now, flag -- O_NOATIME does not be packed by client.
+         */
         if (flag & O_NOATIME) {
                 struct md_ucred *uc = md_ucred(env);
 
@@ -1124,6 +1123,7 @@ static int mdd_open_sanity_check(const struct lu_env *env,
                     !mdd_capable(uc, CAP_FOWNER))
                         RETURN(-EPERM);
         }
+#endif
 
         RETURN(0);
 }
diff --git a/lustre/mdd/mdd_permission.c b/lustre/mdd/mdd_permission.c
index 0a0ee95..ffa7839 100644
--- a/lustre/mdd/mdd_permission.c
+++ b/lustre/mdd/mdd_permission.c
@@ -133,6 +133,9 @@ static inline void mdd_acl_cpu_to_le(posix_acl_xattr_entry *p)
         p->e_id = cpu_to_le32(p->e_id);
 }
 
+/*
+ * Check permission based on POSIX ACL.
+ */
 static int mdd_posix_acl_permission(struct md_ucred *uc, struct lu_attr *la,
                                     int want, posix_acl_xattr_entry *entry,
                                     int count)
@@ -316,10 +319,6 @@ int mdd_acl_chmod(const struct lu_env *env, struct mdd_object *o, __u32 mode,
 
 /*
  * Modify acl when creating a new obj.
- *
- * mode_p initially must contain the mode parameter to the open() / creat()
- * system calls. All permissions that are not granted by the acl are removed.
- * The permissions in the acl are changed to reflect the mode_p parameter.
  */
 static int mdd_posix_acl_create_masq(posix_acl_xattr_entry *entry,
                                      __u32 *mode_p, int count)
@@ -573,27 +572,15 @@ int __mdd_permission_internal(const struct lu_env *env,
                         mode >>= 3;
         }
 
-        /*
-         * If the DACs are ok we don't need any capability check.
-         */
         if (((mode & mask & S_IRWXO) == mask))
                 RETURN(0);
 
 check_capabilities:
-
-        /*
-         * Read/write DACs are always overridable.
-         * Executable DACs are overridable if at least one exec bit is set.
-         * Dir's DACs are always overridable.
-         */
         if (!(mask & MAY_EXEC) ||
             (la->la_mode & S_IXUGO) || S_ISDIR(la->la_mode))
                 if (mdd_capable(uc, CAP_DAC_OVERRIDE))
                         RETURN(0);
 
-        /*
-         * Searching includes executable on directories, else just read.
-         */
         if ((mask == MAY_READ) ||
             (S_ISDIR(la->la_mode) && !(mask & MAY_WRITE)))
                 if (mdd_capable(uc, CAP_DAC_READ_SEARCH))
@@ -609,8 +596,7 @@ int mdd_permission_internal(const struct lu_env *env, struct mdd_object *obj,
 }
 
 inline int mdd_permission_internal_locked(const struct lu_env *env,
-                                                 struct mdd_object *obj,
-                                                 int mask)
+                                          struct mdd_object *obj, int mask)
 {
         int rc;
 
-- 
1.8.3.1