Attachment 2653 Details for Bug 15837 – submount-0.9-compat.patch

[patch] submount-0.9-compat.patch

submount-0.9-compat.patch (text/plain), 8.04 KB, created by led on 2008-05-30 00:11:58 MSD

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Creator: led

Created: 2008-05-30 00:11:58 MSD

Size: 8.04 KB

patch

obsolete

>diff -urN kernel-source-subfs-0.9.orig/subfs.c kernel-source-subfs-0.9/subfs.c
>--- kernel-source-subfs-0.9.orig/subfs.c	2008-02-14 03:36:44 +0200
>+++ kernel-source-subfs-0.9/subfs.c	2008-05-25 03:51:09 +0300
>@@ -7,6 +7,7 @@
>  *  or above.
>  */
> 
>+#include <linux/version.h>
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/kernel.h>
>@@ -17,7 +18,13 @@
> #include <asm/uaccess.h>
> #include <linux/list.h>
> #include <linux/mount.h>
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
>+#include <linux/nsproxy.h>
>+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
>+#include <linux/mnt_namespace.h>
>+#else
> #include <linux/namespace.h>
>+#endif
> #include <linux/namei.h>
> #include <linux/dcache.h>
> #include <linux/sysfs.h>
>@@ -25,6 +32,7 @@
> #include <asm/signal.h>
> #include <linux/signal.h>
> #include <linux/sched.h>
>+#include <linux/rcupdate.h>
> 
> #include "subfs.h"
> 
>@@ -47,7 +56,11 @@
> 	/* Get the head of the global mount list from the init process. */
> 	/* Is there a better way? */
> 	init_fs = init_task.fs;
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	head = &init_fs->root.mnt->mnt_list;
>+#else
> 	head = &init_fs->rootmnt->mnt_list;
>+#endif
> 
> 	/* Go through the list and look for a superblock pointer match. */
> 	list_for_each_safe(entry, lh, head) {
>@@ -72,10 +85,17 @@
> 	struct vfsmount *old_pwdmnt;
> 
> 	write_lock(&fs->lock);
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	old_pwd = fs->pwd.dentry;
>+	old_pwdmnt = fs->pwd.mnt;
>+	fs->pwd.mnt = mntget(mnt);
>+	fs->pwd.dentry = dget(dentry);
>+#else
> 	old_pwd = fs->pwd;
> 	old_pwdmnt = fs->pwdmnt;
> 	fs->pwdmnt = mntget(mnt);
> 	fs->pwd = dget(dentry);
>+#endif
> 	write_unlock(&fs->lock);
> 
> 	if (old_pwd) {
>@@ -94,11 +114,11 @@
> 	struct task_struct *task = current;
> 	int signal = SIGCONT;
> 
>-	read_lock(&tasklist_lock);
>+	rcu_read_lock();
> 	spin_lock_irq(&task->sighand->siglock);
> 	sigaddset(&task->pending.signal, signal);
> 	spin_unlock_irq(&task->sighand->siglock);
>-	read_unlock(&tasklist_lock);
>+	rcu_read_unlock();
> 	set_tsk_thread_flag(task, TIF_SIGPENDING);
> 	return;
> }
>@@ -137,14 +157,21 @@
> 	char *envp[2] = { "HOME=/", NULL };
> 	char *path_buf;
> 	int result, len = 0;
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	struct path p;
>+#endif
> 
> 	argv[1] = sfs_mnt->device;
> 	path_buf = (char *) __get_free_page(GFP_KERNEL);
> 	if (!path_buf)
> 		return -ENOMEM;
>-	argv[2] =
>-	    d_path(sfs_mnt->mount->mnt_mountpoint,
>-		   sfs_mnt->mount->mnt_parent, path_buf, PAGE_SIZE);
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	p.mnt = sfs_mnt->mount;
>+	p.dentry = p.mnt->mnt_root;
>+	argv[2] = d_path(&p, path_buf, PAGE_SIZE);
>+#else
>+	argv[2] = d_path(sfs_mnt->mount->mnt_mountpoint, sfs_mnt->mount->mnt_parent, path_buf, PAGE_SIZE);
>+#endif
> 	argv[3] = sfs_mnt->req_fs;
> 	if (!(argv[4] = kmalloc(17, GFP_KERNEL))) {
> 		free_page((unsigned long) path_buf);
>@@ -221,18 +248,35 @@
> 	struct vfsmount *child;
> 
> 	/* This is ugly, but prevents a lockup during mount. */
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
>+	mutex_unlock(&dir->i_mutex);
>+#else
> 	up(&dir->i_sem);
>+#endif
> 	if (down_interruptible(&sfs_mnt->sem)) {
>-		down(&dir->i_sem);/*put the dir sem back down if interrupted*/
>+		/*put the dir sem back down if interrupted*/
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
>+		mutex_lock(&dir->i_mutex);
>+#else
>+		down(&dir->i_sem);
>+#endif
> 		return ERR_PTR(-ERESTARTSYS);
> 	}
> 	child = get_child_mount(sfs_mnt);
> 	up(&sfs_mnt->sem);
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
>+	mutex_lock(&dir->i_mutex);
>+#else
> 	down(&dir->i_sem);
>+#endif
> 	if (IS_ERR(child))
> 		return (void *) child;
> 	subfs_send_signal();
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	if (sfs_mnt->mount == current->fs->pwd.mnt)
>+#else
> 	if (sfs_mnt->mount == current->fs->pwdmnt)
>+#endif
> 		subfs_set_fs_pwd(current->fs, child, child->mnt_root);
> 	return ERR_PTR(-ERESTARTSYS);
> }
>@@ -254,7 +298,11 @@
> 	if (IS_ERR(child))
> 		return PTR_ERR(child);
> 	subfs_send_signal();
>+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25)
>+	if (sfs_mnt->mount == current->fs->pwd.mnt)
>+#else
> 	if (sfs_mnt->mount == current->fs->pwdmnt)
>+#endif
> 		subfs_set_fs_pwd(current->fs, child, child->mnt_root);
> 	return -ERESTARTSYS;
> }
>@@ -262,9 +310,15 @@
> 
> /*  Implements the statfs method so df and such will work on the mountpoint.
>  */
>+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
>+static int subfs_statfs(struct dentry *dentry, struct kstatfs *buf)
>+{
>+	struct subfs_mount *sfs_mnt = dentry->d_sb->s_fs_info;
>+#else
> static int subfs_statfs(struct super_block *sb, struct kstatfs *buf)
> {
> 	struct subfs_mount *sfs_mnt = sb->s_fs_info;
>+#endif
> 	struct vfsmount *child;
> 	if (down_interruptible(&sfs_mnt->sem))
> 		return -ERESTARTSYS;
>@@ -286,7 +340,9 @@
> 	if (ret) {
> 		ret->i_mode = mode;
> 		ret->i_uid = ret->i_gid = 0;
>+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
> 		ret->i_blksize = PAGE_CACHE_SIZE;
>+#endif
> 		ret->i_blocks = 0;
> 		ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
> 		ret->i_fop = &subfs_file_ops;
>@@ -382,33 +438,61 @@
>  * subfs_mount structure is pointed to by the s_fs_info field of the
>  * superblock structure.
>  */
>+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
>+static int subfs_get_super(struct file_system_type *fst,
>+				int flags, const char *devname, void *data,
>+				struct vfsmount *mnt)
>+#else
> static struct super_block *subfs_get_super(struct file_system_type *fst,
> 				int flags, const char *devname, void *data)
>+#endif
> {
> 	char *device;
> 	struct subfs_mount *newmount;
> 	int ret;
> 
>-	if (!(newmount = kmalloc(sizeof(struct subfs_mount), GFP_KERNEL)))
>-		return ERR_PTR(-ENOMEM);
>+	if (!(newmount = kmalloc(sizeof(struct subfs_mount), GFP_KERNEL))) {
>+		ret = -ENOMEM;
>+		goto err;
>+	}
> 	newmount->req_fs = NULL;
> 	newmount->sb = NULL;
> 	newmount->mount = NULL;
> 	newmount->procuid = 0;
> 	sema_init(&newmount->sem, 1);
>-	if (!(device = kmalloc((strlen(devname) + 1), GFP_KERNEL)))
>-		return ERR_PTR(-ENOMEM);
>+	if (!(device = kmalloc((strlen(devname) + 1), GFP_KERNEL))) {
>+		ret = -ENOMEM;
>+		goto err;
>+	}
> 	strcpy(device, devname);
> 	newmount->device = device;
>         if (!(newmount->helper_prog =
>-        		kmalloc(sizeof(SUBMOUNTD_PATH), GFP_KERNEL)))
>-        	return ERR_PTR(-ENOMEM);
>+        		kmalloc(sizeof(SUBMOUNTD_PATH), GFP_KERNEL))) {
>+			ret = -ENOMEM;
>+			goto err;
>+		}
> 	strcpy(newmount->helper_prog, SUBMOUNTD_PATH);
> 	if ((ret = proc_opts(newmount, data)))
>-		return ERR_PTR(ret);
>+		goto err;
>+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
>+	ret = get_sb_nodev(fst, flags, data, subfs_fill_super, mnt);
>+	if (ret)
>+		goto err;
>+	newmount->sb = mnt->mnt_sb;
>+	newmount->sb->s_fs_info = newmount;
>+	return ret;
>+#else
> 	newmount->sb = get_sb_nodev(fst, flags, data, subfs_fill_super);
> 	newmount->sb->s_fs_info = newmount;
> 	return newmount->sb;
>+#endif
>+
>+err:
>+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
>+	return ret;
>+#else
>+	return ERR_PTR(ret);
>+#endif
> }
> 
> 
>diff -urN kernel-source-subfs-0.9.orig/subfs.h kernel-source-subfs-0.9/subfs.h
>--- kernel-source-subfs-0.9.orig/subfs.h	2008-02-14 03:36:44 +0200
>+++ kernel-source-subfs-0.9/subfs.h	2008-05-25 03:51:05 +0300
>@@ -7,6 +7,7 @@
>  *  or above.
>  */
> 
>+#include <linux/version.h>
> 
> #define SUBFS_MAGIC 0x2c791058
> 
>@@ -33,8 +34,17 @@
> 
> 
> static void subfs_kill_super(struct super_block *sb);
>+
>+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
>+static int subfs_get_super(struct file_system_type *fst,
>+		int flags, const char *devname, void *data, struct vfsmount *mnt);
>+static int subfs_statfs(struct dentry *dentry, struct kstatfs *buf);
>+#else
> static struct super_block *subfs_get_super(struct file_system_type *fst,
> 		int flags, const char *devname, void *data);
>+static int subfs_statfs(struct super_block *sb, struct kstatfs *buf);
>+#endif
>+
> static struct vfsmount *get_subfs_vfsmount(struct super_block *sb);
> static int subfs_fill_super(struct super_block *sb, void *data,
> 			    int silent);
>@@ -47,7 +57,6 @@
> static void subfs_send_signal(void);
> static void subfs_set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt,
> 			     struct dentry *dentry);
>-static int subfs_statfs(struct super_block *sb, struct kstatfs *buf);
> 
> 
> static struct file_system_type subfs_type = {

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