/* support routines */ static int coda_venus_readdir(struct file *coda_file, void *buf, filldir_t filldir) { int result = 0; /* # of entries returned */ struct coda_file_info *cfi; struct coda_inode_info *cii; struct file *host_file; struct dentry *de; struct venus_dirent *vdir; unsigned long vdir_size = (unsigned long)(&((struct venus_dirent *)0)->d_name); unsigned int type; struct qstr name; ino_t ino; int ret; cfi = CODA_FTOC(coda_file); BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); host_file = cfi->cfi_container; de = coda_file->f_path.dentry; cii = ITOC(de->d_inode); vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); if (!vdir) return -ENOMEM; if (coda_file->f_pos == 0) { ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR); if (ret < 0) goto out; result++; coda_file->f_pos++; } if (coda_file->f_pos == 1) { ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR); if (ret < 0) goto out; result++; coda_file->f_pos++; } while (1) { /* read entries from the directory file */ ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir, sizeof(*vdir)); if (ret < 0) { printk(KERN_ERR "coda readdir: read dir %s failed %d\n", coda_f2s(&cii->c_fid), ret); break; } if (ret == 0) break; /* end of directory file reached */ /* catch truncated reads */ if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { printk(KERN_ERR "coda readdir: short read on %s\n", coda_f2s(&cii->c_fid)); ret = -EBADF; break; } /* validate whether the directory file actually makes sense */ if (vdir->d_reclen < vdir_size + vdir->d_namlen) { printk(KERN_ERR "coda readdir: invalid dir %s\n", coda_f2s(&cii->c_fid)); ret = -EBADF; break; } name.len = vdir->d_namlen; name.name = vdir->d_name; /* Make sure we skip '.' and '..', we already got those */ if (name.name[0] == '.' && (name.len == 1 || (vdir->d_name[1] == '.' && name.len == 2))) vdir->d_fileno = name.len = 0; /* skip null entries */ if (vdir->d_fileno && name.len) { /* try to look up this entry in the dcache, that way * userspace doesn't have to worry about breaking * getcwd by having mismatched inode numbers for * internal volume mountpoints. */ ino = find_inode_number(de, &name); if (!ino) ino = vdir->d_fileno; type = CDT2DT(vdir->d_type); ret = filldir(buf, name.name, name.len, coda_file->f_pos, ino, type); /* failure means no space for filling in this round */ if (ret < 0) break; result++; } /* we'll always have progress because d_reclen is unsigned and * we've already established it is non-zero. */ coda_file->f_pos += vdir->d_reclen; } out: kfree(vdir); return result ? result : ret; }
/* support routines */ static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx) { struct coda_file_info *cfi; struct coda_inode_info *cii; struct file *host_file; struct venus_dirent *vdir; unsigned long vdir_size = offsetof(struct venus_dirent, d_name); unsigned int type; struct qstr name; ino_t ino; int ret; cfi = CODA_FTOC(coda_file); BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); host_file = cfi->cfi_container; cii = ITOC(file_inode(coda_file)); vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); if (!vdir) return -ENOMEM; if (!dir_emit_dots(coda_file, ctx)) goto out; while (1) { /* read entries from the directory file */ ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir, sizeof(*vdir)); if (ret < 0) { pr_err("%s: read dir %s failed %d\n", __func__, coda_f2s(&cii->c_fid), ret); break; } if (ret == 0) break; /* end of directory file reached */ /* catch truncated reads */ if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { pr_err("%s: short read on %s\n", __func__, coda_f2s(&cii->c_fid)); ret = -EBADF; break; } /* validate whether the directory file actually makes sense */ if (vdir->d_reclen < vdir_size + vdir->d_namlen) { pr_err("%s: invalid dir %s\n", __func__, coda_f2s(&cii->c_fid)); ret = -EBADF; break; } name.len = vdir->d_namlen; name.name = vdir->d_name; /* Make sure we skip '.' and '..', we already got those */ if (name.name[0] == '.' && (name.len == 1 || (name.name[1] == '.' && name.len == 2))) vdir->d_fileno = name.len = 0; /* skip null entries */ if (vdir->d_fileno && name.len) { ino = vdir->d_fileno; type = CDT2DT(vdir->d_type); if (!dir_emit(ctx, name.name, name.len, ino, type)) break; } /* we'll always have progress because d_reclen is unsigned and * we've already established it is non-zero. */ ctx->pos += vdir->d_reclen; } out: kfree(vdir); return 0; }
/* support routines */ static int coda_venus_readdir(struct file *filp, filldir_t filldir, void *dirent, struct dentry *dir) { int result = 0; /* # of entries returned */ struct venus_dirent *vdir; unsigned long vdir_size = (unsigned long)(&((struct venus_dirent *)0)->d_name); unsigned int type; struct qstr name; ino_t ino; int ret, i; vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); if (!vdir) return -ENOMEM; i = filp->f_pos; switch(i) { case 0: ret = filldir(dirent, ".", 1, 0, dir->d_inode->i_ino, DT_DIR); if (ret < 0) break; result++; filp->f_pos++; /* fallthrough */ case 1: ret = filldir(dirent, "..", 2, 1, dir->d_parent->d_inode->i_ino, DT_DIR); if (ret < 0) break; result++; filp->f_pos++; /* fallthrough */ default: while (1) { /* read entries from the directory file */ ret = kernel_read(filp, filp->f_pos - 2, (char *)vdir, sizeof(*vdir)); if (ret < 0) { printk("coda_venus_readdir: read dir failed %d\n", ret); break; } if (ret == 0) break; /* end of directory file reached */ /* catch truncated reads */ if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { printk("coda_venus_readdir: short read: %ld\n", filp->f_path.dentry->d_inode->i_ino); ret = -EBADF; break; } /* validate whether the directory file actually makes sense */ if (vdir->d_reclen < vdir_size + vdir->d_namlen) { printk("coda_venus_readdir: Invalid dir: %ld\n", filp->f_path.dentry->d_inode->i_ino); ret = -EBADF; break; } name.len = vdir->d_namlen; name.name = vdir->d_name; /* Make sure we skip '.' and '..', we already got those */ if (name.name[0] == '.' && (name.len == 1 || (vdir->d_name[1] == '.' && name.len == 2))) vdir->d_fileno = name.len = 0; /* skip null entries */ if (vdir->d_fileno && name.len) { /* try to look up this entry in the dcache, that way * userspace doesn't have to worry about breaking * getcwd by having mismatched inode numbers for * internal volume mountpoints. */ ino = find_inode_number(dir, &name); if (!ino) ino = vdir->d_fileno; type = CDT2DT(vdir->d_type); ret = filldir(dirent, name.name, name.len, filp->f_pos, ino, type); /* failure means no space for filling in this round */ if (ret < 0) break; result++; } /* we'll always have progress because d_reclen is unsigned and * we've already established it is non-zero. */ filp->f_pos += vdir->d_reclen; } } kfree(vdir); return result ? result : ret; }
static int coda_venus_readdir(struct file *coda_file, void *buf, filldir_t filldir) { int result = 0; struct coda_file_info *cfi; struct coda_inode_info *cii; struct file *host_file; struct dentry *de; struct venus_dirent *vdir; unsigned long vdir_size = offsetof(struct venus_dirent, d_name); unsigned int type; struct qstr name; ino_t ino; int ret; cfi = CODA_FTOC(coda_file); BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); host_file = cfi->cfi_container; de = coda_file->f_path.dentry; cii = ITOC(de->d_inode); vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); if (!vdir) return -ENOMEM; if (coda_file->f_pos == 0) { ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR); if (ret < 0) goto out; result++; coda_file->f_pos++; } if (coda_file->f_pos == 1) { ret = filldir(buf, "..", 2, 1, parent_ino(de), DT_DIR); if (ret < 0) goto out; result++; coda_file->f_pos++; } while (1) { ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir, sizeof(*vdir)); if (ret < 0) { printk(KERN_ERR "coda readdir: read dir %s failed %d\n", coda_f2s(&cii->c_fid), ret); break; } if (ret == 0) break; if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { printk(KERN_ERR "coda readdir: short read on %s\n", coda_f2s(&cii->c_fid)); ret = -EBADF; break; } if (vdir->d_reclen < vdir_size + vdir->d_namlen) { printk(KERN_ERR "coda readdir: invalid dir %s\n", coda_f2s(&cii->c_fid)); ret = -EBADF; break; } name.len = vdir->d_namlen; name.name = vdir->d_name; if (name.name[0] == '.' && (name.len == 1 || (vdir->d_name[1] == '.' && name.len == 2))) vdir->d_fileno = name.len = 0; if (vdir->d_fileno && name.len) { ino = find_inode_number(de, &name); if (!ino) ino = vdir->d_fileno; type = CDT2DT(vdir->d_type); ret = filldir(buf, name.name, name.len, coda_file->f_pos, ino, type); if (ret < 0) break; result++; } coda_file->f_pos += vdir->d_reclen; } out: kfree(vdir); return result ? result : ret; }