mirror of https://github.com/hak5/openwrt.git
187 lines
5.0 KiB
Diff
187 lines
5.0 KiB
Diff
--- a/fs/jffs2/dir.c
|
|
+++ b/fs/jffs2/dir.c
|
|
@@ -34,6 +34,9 @@ static int jffs2_mknod (struct inode *,s
|
|
static int jffs2_rename (struct inode *, struct dentry *,
|
|
struct inode *, struct dentry *);
|
|
|
|
+static int jffs2_whiteout (struct inode *, struct dentry *, struct dentry *);
|
|
+static int jffs2_fallthru (struct inode *, struct dentry *);
|
|
+
|
|
const struct file_operations jffs2_dir_operations =
|
|
{
|
|
.read = generic_read_dir,
|
|
@@ -55,6 +58,8 @@ const struct inode_operations jffs2_dir_
|
|
.rmdir = jffs2_rmdir,
|
|
.mknod = jffs2_mknod,
|
|
.rename = jffs2_rename,
|
|
+ .fallthru = jffs2_fallthru,
|
|
+ .whiteout = jffs2_whiteout,
|
|
.check_acl = jffs2_check_acl,
|
|
.setattr = jffs2_setattr,
|
|
.setxattr = jffs2_setxattr,
|
|
@@ -98,8 +103,21 @@ static struct dentry *jffs2_lookup(struc
|
|
fd = fd_list;
|
|
}
|
|
}
|
|
- if (fd)
|
|
- ino = fd->ino;
|
|
+ if (fd) {
|
|
+ spin_lock(&target->d_lock);
|
|
+ switch(fd->type) {
|
|
+ case DT_WHT:
|
|
+ target->d_flags |= DCACHE_WHITEOUT;
|
|
+ break;
|
|
+ case DT_UNKNOWN:
|
|
+ target->d_flags |= DCACHE_FALLTHRU;
|
|
+ break;
|
|
+ default:
|
|
+ ino = fd->ino;
|
|
+ break;
|
|
+ }
|
|
+ spin_unlock(&target->d_lock);
|
|
+ }
|
|
mutex_unlock(&dir_f->sem);
|
|
if (ino) {
|
|
inode = jffs2_iget(dir_i->i_sb, ino);
|
|
@@ -155,7 +173,9 @@ static int jffs2_readdir(struct file *fi
|
|
fd->name, fd->ino, fd->type, curofs, offset));
|
|
continue;
|
|
}
|
|
- if (!fd->ino) {
|
|
+ if (fd->type == DT_UNKNOWN)
|
|
+ fd->ino = 100; /* XXX: arbitrary */
|
|
+ else if (!fd->ino && (fd->type != DT_WHT)) {
|
|
D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
|
|
offset++;
|
|
continue;
|
|
@@ -498,6 +518,11 @@ static int jffs2_mkdir (struct inode *di
|
|
return PTR_ERR(inode);
|
|
}
|
|
|
|
+ if (dentry->d_flags & DCACHE_WHITEOUT) {
|
|
+ inode->i_flags |= S_OPAQUE;
|
|
+ ri->flags = cpu_to_je16(JFFS2_INO_FLAG_OPAQUE);
|
|
+ }
|
|
+
|
|
inode->i_op = &jffs2_dir_inode_operations;
|
|
inode->i_fop = &jffs2_dir_operations;
|
|
|
|
@@ -779,6 +804,82 @@ static int jffs2_mknod (struct inode *di
|
|
return 0;
|
|
}
|
|
|
|
+static int jffs2_fallthru (struct inode *dir, struct dentry *dentry)
|
|
+{
|
|
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(dir->i_sb);
|
|
+ uint32_t now;
|
|
+ int ret;
|
|
+
|
|
+ now = get_seconds();
|
|
+ ret = jffs2_do_link(c, JFFS2_INODE_INFO(dir), 0, DT_UNKNOWN,
|
|
+ dentry->d_name.name, dentry->d_name.len, now);
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ d_instantiate(dentry, NULL);
|
|
+ spin_lock(&dentry->d_lock);
|
|
+ dentry->d_flags |= DCACHE_FALLTHRU;
|
|
+ spin_unlock(&dentry->d_lock);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int jffs2_whiteout (struct inode *dir, struct dentry *old_dentry,
|
|
+ struct dentry *new_dentry)
|
|
+{
|
|
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(dir->i_sb);
|
|
+ struct jffs2_inode_info *victim_f = NULL;
|
|
+ uint32_t now;
|
|
+ int ret;
|
|
+
|
|
+ /* If it's a directory, then check whether it is really empty
|
|
+ */
|
|
+ if (new_dentry->d_inode) {
|
|
+ victim_f = JFFS2_INODE_INFO(old_dentry->d_inode);
|
|
+ if (S_ISDIR(old_dentry->d_inode->i_mode)) {
|
|
+ struct jffs2_full_dirent *fd;
|
|
+
|
|
+ mutex_lock(&victim_f->sem);
|
|
+ for (fd = victim_f->dents; fd; fd = fd->next) {
|
|
+ if (fd->ino) {
|
|
+ mutex_unlock(&victim_f->sem);
|
|
+ return -ENOTEMPTY;
|
|
+ }
|
|
+ }
|
|
+ mutex_unlock(&victim_f->sem);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ now = get_seconds();
|
|
+ ret = jffs2_do_link(c, JFFS2_INODE_INFO(dir), 0, DT_WHT,
|
|
+ new_dentry->d_name.name, new_dentry->d_name.len, now);
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
+ spin_lock(&new_dentry->d_lock);
|
|
+ new_dentry->d_flags &= ~DCACHE_FALLTHRU;
|
|
+ new_dentry->d_flags |= DCACHE_WHITEOUT;
|
|
+ spin_unlock(&new_dentry->d_lock);
|
|
+ d_add(new_dentry, NULL);
|
|
+
|
|
+ if (victim_f) {
|
|
+ /* There was a victim. Kill it off nicely */
|
|
+ drop_nlink(old_dentry->d_inode);
|
|
+ /* Don't oops if the victim was a dirent pointing to an
|
|
+ inode which didn't exist. */
|
|
+ if (victim_f->inocache) {
|
|
+ mutex_lock(&victim_f->sem);
|
|
+ if (S_ISDIR(old_dentry->d_inode->i_mode))
|
|
+ victim_f->inocache->pino_nlink = 0;
|
|
+ else
|
|
+ victim_f->inocache->pino_nlink--;
|
|
+ mutex_unlock(&victim_f->sem);
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
|
|
struct inode *new_dir_i, struct dentry *new_dentry)
|
|
{
|
|
--- a/fs/jffs2/fs.c
|
|
+++ b/fs/jffs2/fs.c
|
|
@@ -301,6 +301,10 @@ struct inode *jffs2_iget(struct super_bl
|
|
|
|
inode->i_op = &jffs2_dir_inode_operations;
|
|
inode->i_fop = &jffs2_dir_operations;
|
|
+
|
|
+ if (je16_to_cpu(latest_node.flags) & JFFS2_INO_FLAG_OPAQUE)
|
|
+ inode->i_flags |= S_OPAQUE;
|
|
+
|
|
break;
|
|
}
|
|
case S_IFREG:
|
|
--- a/fs/jffs2/super.c
|
|
+++ b/fs/jffs2/super.c
|
|
@@ -172,7 +172,7 @@ static int jffs2_fill_super(struct super
|
|
|
|
sb->s_op = &jffs2_super_operations;
|
|
sb->s_export_op = &jffs2_export_ops;
|
|
- sb->s_flags = sb->s_flags | MS_NOATIME;
|
|
+ sb->s_flags = sb->s_flags | MS_NOATIME | MS_WHITEOUT;
|
|
sb->s_xattr = jffs2_xattr_handlers;
|
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
|
|
sb->s_flags |= MS_POSIXACL;
|
|
--- a/include/linux/jffs2.h
|
|
+++ b/include/linux/jffs2.h
|
|
@@ -87,6 +87,8 @@
|
|
#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific
|
|
compression type */
|
|
|
|
+#define JFFS2_INO_FLAG_OPAQUE 4 /* Directory is opaque (for union mounts) */
|
|
+
|
|
|
|
/* These can go once we've made sure we've caught all uses without
|
|
byteswapping */
|