From: acevest <zhaoyanbai@126.com>
Date: Sat, 28 Sep 2024 09:25:06 +0000 (+0800)
Subject: 弃用ERR_PTR PTR_ERR IS_ERR的错误码返回方式
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;p=kernel.git

弃用ERR_PTR PTR_ERR IS_ERR的错误码返回方式
---

diff --git a/fs/dentry.c b/fs/dentry.c
index 7bf7d71..04081a2 100644
--- a/fs/dentry.c
+++ b/fs/dentry.c
@@ -140,44 +140,45 @@ void dentry_add(dentry_t *dentry, inode_t *inode) {
     dentry_rehash(dentry);
 }
 
-dentry_t *dentry_cached_lookup(dentry_t *parent, qstr_t *s) {
+int dentry_cached_lookup(dentry_t *parent, qstr_t *s, dentry_t **dentry) {
     dentry_hash_entry_t *dhe = dentry_hash(parent, s->hash);
 
-    dentry_t *dentry = NULL;
+    *dentry = NULL;
 
     mutex_lock(&dhe->mutex);
 
     list_head_t *p;
     list_for_each(p, &dhe->list) {
-        dentry = list_entry(p, dentry_t, d_hash);
-        assert(dentry != NULL);
+        *dentry = list_entry(p, dentry_t, d_hash);
+        assert(*dentry != NULL);
 
-        if (dentry->d_name.hash != s->hash) {
+        if ((*dentry)->d_name.hash != s->hash) {
             continue;
         }
 
-        if (dentry->d_name.len != s->len) {
+        if ((*dentry)->d_name.len != s->len) {
             continue;
         }
 
-        if (dentry->d_parent != parent) {
+        if ((*dentry)->d_parent != parent) {
             continue;
         }
 
-        if (memcmp(dentry->d_name.name, s->name, s->len) != 0) {
+        if (memcmp((*dentry)->d_name.name, s->name, s->len) != 0) {
             continue;
         }
 
-        dentry_get_locked(dentry);
+        dentry_get_locked(*dentry);
 
         mutex_unlock(&dhe->mutex);
-        return dentry;
+        return 0;
     }
 
     mutex_unlock(&dhe->mutex);
 
-    return NULL;
+    return 0;
 }
+
 int dentry_real_lookup(dentry_t *parent, qstr_t *s, dentry_t **dentry) {
     *dentry = NULL;
     int ret = 0;
@@ -189,7 +190,8 @@ int dentry_real_lookup(dentry_t *parent, qstr_t *s, dentry_t **dentry) {
 
     // 在获得信号量后，需要再上cache中查找一遍
     // 因为这个过程中当前进程可能会睡眠，当被唤醒后，其它进程已经在内存准备好了
-    *dentry = dentry_cached_lookup(parent, s);
+    ret = dentry_cached_lookup(parent, s, dentry);
+    assert(0 == ret);
 
     if (NULL != *dentry) {
         up(&dir->i_sem);
diff --git a/fs/fssysc.c b/fs/fssysc.c
index 255b964..22435b7 100644
--- a/fs/fssysc.c
+++ b/fs/fssysc.c
@@ -26,12 +26,14 @@ __attribute__((regparm(0))) long sysc_mkdir(const char *path, int mode) {
         }
     }
 
-    dentry_t *dentry;
-    dentry = path_lookup_create(&ni);
-    ret = PTR_ERR(dentry);
-    if (!IS_ERR(dentry)) {
+    dentry_t *dentry = NULL;
+    ret = path_lookup_create(&ni, &dentry);
+    if (0 != ret) {
+        assert(dentry == NULL);
         ret = vfs_mkdir(ni.path.dentry->d_inode, dentry, mode);
         dentry_put(dentry);
+    } else {
+        assert(dentry != NULL);
     }
 
     up(&ni.path.dentry->d_inode->i_sem);
diff --git a/fs/path.c b/fs/path.c
index 25dfb3a..48d2caa 100644
--- a/fs/path.c
+++ b/fs/path.c
@@ -201,7 +201,8 @@ int path_walk(const char *path, namei_t *ni) {
         compute_qstr_hash(&this);
 
         // 根据该名字，先上dentry cache里找
-        dentry = dentry_cached_lookup(ni->path.dentry, &this);
+        ret = dentry_cached_lookup(ni->path.dentry, &this, &dentry);
+        assert(0 == ret);
 
         // 如果找不到就上实际存储设备中去找
         if (NULL == dentry) {
@@ -281,7 +282,8 @@ int path_walk(const char *path, namei_t *ni) {
         // printk("HASH %s %lu\n", this.name, this.hash);
 
         // 根据该名字，先上dentry cache里找
-        dentry = dentry_cached_lookup(ni->path.dentry, &this);
+        ret = dentry_cached_lookup(ni->path.dentry, &this, &dentry);
+        assert(0 == ret);
 
         // 如果找不到就上实际存储设备中去找
         if (NULL == dentry) {
@@ -328,50 +330,49 @@ end:
     return ret;
 }
 
-dentry_t *path_lookup_hash(dentry_t *base, qstr_t *name) {
-    dentry_t *dentry = NULL;
-
+int path_lookup_hash(dentry_t *base, qstr_t *name, dentry_t **dentry) {
+    int ret = 0;
     inode_t *inode = base->d_inode;
 
-    dentry = dentry_cached_lookup(base, name);
-    if (dentry != NULL) {
-        return dentry;
+    ret = dentry_cached_lookup(base, name, dentry);
+    assert(0 == ret);
+    if (*dentry != NULL) {
+        return 0;
     }
 
     dentry_t *dentry_new = dentry_alloc(base, name);
     if (dentry_new == NULL) {
-        dentry = ERR_PTR(-ENOMEM);
-        return dentry;
+        return ENOMEM;
     }
 
-    dentry = inode->i_ops->lookup(inode, dentry_new);
+    *dentry = inode->i_ops->lookup(inode, dentry_new);
 
-    if (dentry == NULL) {  // 返回 lookup 没有再分配一个dentry
-        dentry = dentry_new;
+    if (*dentry == NULL) {  // 返回 lookup 没有再分配一个dentry
+        *dentry = dentry_new;
     } else {  // 否则就释放dentry_new使用lookup返回的dentry
         dentry_put(dentry_new);
     }
 
-    return dentry;
+    return 0;
 }
 
-dentry_t *path_lookup_create(namei_t *ni) {
-    dentry_t *dentry = NULL;
+int path_lookup_create(namei_t *ni, dentry_t **dentry) {
+    int err = 0;
 
     // 在调用完path_lookup_create后调用 up 操作
     down(&ni->path.dentry->d_inode->i_sem);
 
-    dentry = ERR_PTR(-EEXIST);
+    //
     if (ni->last_type != LAST_NORMAL) {
-        return dentry;
+        return EEXIST;
     }
 
-    dentry = path_lookup_hash(ni->path.dentry, &ni->last);
-    if (IS_ERR(dentry)) {
-        return dentry;
+    err = path_lookup_hash(ni->path.dentry, &ni->last, dentry);
+    if (err != 0) {
+        return err;
     }
 
-    return dentry;
+    return err;
 }
 
 int path_open_namei(const char *path, int flags, int mode, namei_t *ni) {
@@ -406,9 +407,8 @@ int path_open_namei(const char *path, int flags, int mode, namei_t *ni) {
 
     down(&dir->d_inode->i_sem);
 
-    dentry = dentry_cached_lookup(dir, &ni->last);
-    if (IS_ERR(dentry)) {
-        ret = PTR_ERR(dentry);
+    ret = path_lookup_hash(dir, &ni->last, &dentry);
+    if (0 != ret) {
         up(&dir->d_inode->i_sem);
         goto end;
     }
diff --git a/fs/super.c b/fs/super.c
index 0f8f334..2fffc62 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -39,57 +39,59 @@ int set_anonymous_super(superblock_t *s, void *data) {
 }
 
 int read_super_for_nodev(fs_type_t *type, int flags, void *data, fill_super_cb_t fill_super, vfsmount_t *mnt) {
-    int ret = 0;
+    int err = 0;
     superblock_t *s = 0;
 
     // 分配superblock
-    s = sget(type, NULL, set_anonymous_super, NULL);
+    err = sget(type, NULL, set_anonymous_super, NULL, &s);
 
     assert(s != NULL);
 
     //
     s->sb_flags = flags;
 
-    ret = fill_super(s, data);
-    if (0 != ret) {
-        panic("ret: %d", ret);
+    err = fill_super(s, data);
+    if (0 != err) {
+        panic("err: %d", err);
     }
 
     mnt->mnt_sb = s;
     mnt->mnt_root = dentry_get(s->sb_root);
 
-    return ret;
+    return err;
 }
 
-superblock_t *sget(fs_type_t *type,                      //
-                   int (*test)(superblock_t *, void *),  //
-                   int (*set)(superblock_t *, void *),   //
-                   void *data                            //
+int sget(fs_type_t *type,                      //
+         int (*test)(superblock_t *, void *),  //
+         int (*set)(superblock_t *, void *),   //
+         void *data,                           //
+         superblock_t **s                      //
 ) {
-    int ret = 0;
-    superblock_t *s = 0;
+    int err = 0;
+
+    *s = 0;
 
     if (0 != test) {
         panic("not implemented");
     }
 
     // TOOD REMOVE
-    assert(0 == s);
+    assert(0 == *s);
 
-    s = alloc_super(type);
-    if (0 == s) {
-        return ERR_PTR(-ENOMEM);
+    *s = alloc_super(type);
+    if (0 == *s) {
+        return ENOMEM;
     }
 
     assert(0 != set);
 
-    ret = set(s, data);
-    assert(0 == ret);
+    err = set(*s, data);
+    assert(0 == err);
 
     uint32_t eflags;
     irq_save(eflags);
-    list_add_tail(&s->sb_list, &g_superblocks);
+    list_add_tail(&(*s)->sb_list, &g_superblocks);
     irq_restore(eflags);
 
-    return s;
+    return err;
 }
diff --git a/fs/vfs.h b/fs/vfs.h
index 9902063..d215530 100644
--- a/fs/vfs.h
+++ b/fs/vfs.h
@@ -285,8 +285,16 @@ inode_t *alloc_inode(superblock_t *sb);
 void init_special_inode(inode_t *inode, umode_t mode, dev_t rdev);
 ////
 
-dentry_t *dentry_cached_lookup(dentry_t *parent, qstr_t *s);
-int dentry_real_lookup(dentry_t *parent, qstr_t *s, dentry_t **dentry);
+int dentry_cached_lookup(dentry_t *parent,  //
+                         qstr_t *s,         //
+                         dentry_t **dentry  // OUT
+);
+
+int dentry_real_lookup(dentry_t *parent,  //
+                       qstr_t *s,         //
+                       dentry_t **dentry  // OUT
+);
+
 dentry_t *dentry_alloc_root(inode_t *root_inode);
 dentry_t *dentry_alloc(dentry_t *parent, const qstr_t *s);
 void dentry_add(dentry_t *dentry, inode_t *inode);
@@ -306,4 +314,6 @@ extern const file_operations_t simple_dir_operations;
 //
 bool path_init(const char *path, unsigned int flags, namei_t *ni);
 int path_walk(const char *path, namei_t *ni);
-dentry_t *path_lookup_create(namei_t *ni);
+int path_lookup_create(namei_t *ni,       //
+                       dentry_t **dentry  // OUT
+);
diff --git a/include/fs.h b/include/fs.h
index 5db8166..3e21fb0 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -59,10 +59,11 @@ extern chrdev_t *chrdev[];
 typedef int (*fill_super_cb_t)(superblock_t *sb, void *data);
 int read_super_for_nodev(fs_type_t *type, int flags, void *data, fill_super_cb_t fill_super, vfsmount_t *mnt);
 
-superblock_t *sget(fs_type_t *type,                      //
-                   int (*test)(superblock_t *, void *),  //
-                   int (*set)(superblock_t *, void *),   //
-                   void *data                            //
+int sget(fs_type_t *type,                      //
+         int (*test)(superblock_t *, void *),  //
+         int (*set)(superblock_t *, void *),   //
+         void *data,                           //
+         superblock_t **s                      // OUT
 );
 
 file_t *get_file(int fd);
diff --git a/include/system.h b/include/system.h
index d0fd0a0..b61f772 100644
--- a/include/system.h
+++ b/include/system.h
@@ -272,18 +272,4 @@ void boot_delay(int ticks);
 
 #endif
 
-#define MAX_ERRNO 4095
-
-#ifndef ASM
-
-#define IS_ERR_VALUE(x) (((unsigned long)(x)) >= ((unsigned long)(-MAX_ERRNO)))
-
-static inline void *ERR_PTR(long err) { return ((void *)(err)); }
-
-static inline long PTR_ERR(void *p) { return ((long)(p)); }
-
-static inline bool IS_ERR(void *p) { return IS_ERR_VALUE(p); }
-
-#endif
-
 #endif  //_SYSTEM_H
diff --git a/kernel/task_root.c b/kernel/task_root.c
index 95d5477..7b4c1b0 100644
--- a/kernel/task_root.c
+++ b/kernel/task_root.c
@@ -49,7 +49,7 @@ void kernel_task(char *name, void *entry, void *arg) {
     regs.ss = SELECTOR_KRNL_DS;
     regs.fs = SELECTOR_KRNL_DS;
     regs.gs = SELECTOR_KRNL_DS;
-#if 0
+#if 1
     get_eflags(regs.eflags);
 #else
     regs.eflags = 0x200;
@@ -74,12 +74,10 @@ void root_task_entry() {
     }
 #endif
 
-    // sti();
+    sti();
 
     kernel_task("init", init_task_entry, NULL);
 
-    sti();
-
     current->priority = 1;
     while (1) {
         asm("hlt;");