From: Gao Xiang <gaoxiang25@huawei.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<devel@driverdev.osuosl.org>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-erofs@lists.ozlabs.org>, <yuchao0@huawei.com>,
<miaoxie@huawei.com>, <weidu.du@huawei.com>, <hsiangkao@aol.com>,
<chao@kernel.org>, Gao Xiang <gaoxiang25@huawei.com>
Subject: [PATCH 05/25] staging: erofs: add inode operations
Date: Thu, 26 Jul 2018 20:21:48 +0800 [thread overview]
Message-ID: <1532607728-103372-6-git-send-email-gaoxiang25@huawei.com> (raw)
In-Reply-To: <1532607728-103372-1-git-send-email-gaoxiang25@huawei.com>
This adds core functions to get, read an inode.
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
drivers/staging/erofs/inode.c | 210 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 210 insertions(+)
create mode 100644 drivers/staging/erofs/inode.c
diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
new file mode 100644
index 0000000..74e65be
--- /dev/null
+++ b/drivers/staging/erofs/inode.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/drivers/staging/erofs/inode.c
+ *
+ * Copyright (C) 2017-2018 HUAWEI, Inc.
+ * http://www.huawei.com/
+ * Created by Gao Xiang <gaoxiang25@huawei.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of the Linux
+ * distribution for more details.
+ */
+#include "internal.h"
+
+/* no locking */
+static int read_inode(struct inode *inode, void *data)
+{
+ struct erofs_vnode *vi = EROFS_V(inode);
+ struct erofs_inode_v1 *v1 = data;
+ const unsigned advise = le16_to_cpu(v1->i_advise);
+
+ vi->data_mapping_mode = __inode_data_mapping(advise);
+
+ if (unlikely(vi->data_mapping_mode >= EROFS_INODE_LAYOUT_MAX)) {
+ errln("unknown data mapping mode %u of nid %llu",
+ vi->data_mapping_mode, vi->nid);
+ DBG_BUGON(1);
+ return -EIO;
+ }
+
+ if (__inode_version(advise) == EROFS_INODE_LAYOUT_V2) {
+ struct erofs_inode_v2 *v2 = data;
+
+ vi->inode_isize = sizeof(struct erofs_inode_v2);
+ vi->xattr_isize = ondisk_xattr_ibody_size(v2->i_xattr_icount);
+
+ vi->raw_blkaddr = le32_to_cpu(v2->i_u.raw_blkaddr);
+ inode->i_mode = le16_to_cpu(v2->i_mode);
+
+ i_uid_write(inode, le32_to_cpu(v2->i_uid));
+ i_gid_write(inode, le32_to_cpu(v2->i_gid));
+ set_nlink(inode, le32_to_cpu(v2->i_nlink));
+
+ /* ns timestamp */
+ inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
+ le64_to_cpu(v2->i_ctime);
+ inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
+ le32_to_cpu(v2->i_ctime_nsec);
+
+ inode->i_size = le64_to_cpu(v2->i_size);
+ } else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
+ struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
+
+ vi->inode_isize = sizeof(struct erofs_inode_v1);
+ vi->xattr_isize = ondisk_xattr_ibody_size(v1->i_xattr_icount);
+
+ vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
+ inode->i_mode = le16_to_cpu(v1->i_mode);
+
+ i_uid_write(inode, le16_to_cpu(v1->i_uid));
+ i_gid_write(inode, le16_to_cpu(v1->i_gid));
+ set_nlink(inode, le16_to_cpu(v1->i_nlink));
+
+ /* use build time to derive all file time */
+ inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
+ sbi->build_time;
+ inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
+ sbi->build_time_nsec;
+
+ inode->i_size = le32_to_cpu(v1->i_size);
+ } else {
+ errln("unsupported on-disk inode version %u of nid %llu",
+ __inode_version(advise), vi->nid);
+ DBG_BUGON(1);
+ return -EIO;
+ }
+
+ /* measure inode.i_blocks as the generic filesystem */
+ inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
+ return 0;
+}
+
+/*
+ * try_lock can be required since locking order is:
+ * file data(fs_inode)
+ * meta(bd_inode)
+ * but the majority of the callers is "iget",
+ * in that case we are pretty sure no deadlock since
+ * no data operations exist. However I tend to
+ * try_lock since it takes no much overhead and
+ * will success immediately.
+ */
+static int fill_inline_data(struct inode *inode, void *data, unsigned m_pofs)
+{
+ struct erofs_vnode *vi = EROFS_V(inode);
+ int mode = vi->data_mapping_mode;
+
+ DBG_BUGON(mode >= EROFS_INODE_LAYOUT_MAX);
+
+ /* should be inode inline C */
+ if (mode != EROFS_INODE_LAYOUT_INLINE)
+ return 0;
+
+ /* fast symlink (following ext4) */
+ if (S_ISLNK(inode->i_mode) && inode->i_size < PAGE_SIZE) {
+ char *lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
+
+ if (unlikely(lnk == NULL))
+ return -ENOMEM;
+
+ m_pofs += vi->inode_isize + vi->xattr_isize;
+ BUG_ON(m_pofs + inode->i_size > PAGE_SIZE);
+
+ /* get in-page inline data */
+ memcpy(lnk, data + m_pofs, inode->i_size);
+ lnk[inode->i_size] = '\0';
+
+ inode->i_link = lnk;
+ set_inode_fast_symlink(inode);
+ }
+ return -EAGAIN;
+}
+
+static int fill_inode(struct inode *inode, int isdir)
+{
+ struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
+ struct erofs_vnode *vi = EROFS_V(inode);
+ struct page *page;
+ void *data;
+ int err;
+ erofs_blk_t blkaddr;
+ unsigned ofs;
+
+ blkaddr = erofs_blknr(iloc(sbi, vi->nid));
+ ofs = erofs_blkoff(iloc(sbi, vi->nid));
+
+ debugln("%s, reading inode nid %llu at %u of blkaddr %u",
+ __func__, vi->nid, ofs, blkaddr);
+
+ page = erofs_get_meta_page(inode->i_sb, blkaddr, isdir);
+
+ if (IS_ERR(page)) {
+ errln("failed to get inode (nid: %llu) page, err %ld",
+ vi->nid, PTR_ERR(page));
+ return PTR_ERR(page);
+ }
+
+ BUG_ON(!PageUptodate(page));
+ data = page_address(page);
+
+ err = read_inode(inode, data + ofs);
+ if (!err) {
+ /* setup the new inode */
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &generic_ro_fops;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op =
+ &erofs_dir_iops;
+ inode->i_fop = &erofs_dir_fops;
+ } else if (S_ISLNK(inode->i_mode)) {
+ /* by default, page_get_link is used for symlink */
+ inode->i_op =
+ &page_symlink_inode_operations;
+ inode_nohighmem(inode);
+ } else {
+ err = -EIO;
+ goto out_unlock;
+ }
+
+ if (is_inode_layout_compression(inode)) {
+ err = -ENOTSUPP;
+ goto out_unlock;
+ }
+
+ inode->i_mapping->a_ops = &erofs_raw_access_aops;
+
+ /* fill last page if inline data is available */
+ fill_inline_data(inode, data, ofs);
+ }
+
+out_unlock:
+ unlock_page(page);
+ put_page(page);
+ return err;
+}
+
+struct inode *erofs_iget(struct super_block *sb,
+ erofs_nid_t nid, bool isdir)
+{
+ struct inode *inode = iget_locked(sb, nid);
+
+ if (unlikely(inode == NULL))
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_state & I_NEW) {
+ int err;
+ struct erofs_vnode *vi = EROFS_V(inode);
+ vi->nid = nid;
+
+ err = fill_inode(inode, isdir);
+ if (likely(!err))
+ unlock_new_inode(inode);
+ else {
+ iget_failed(inode);
+ inode = ERR_PTR(err);
+ }
+ }
+ return inode;
+}
+
--
1.9.1
next prev parent reply other threads:[~2018-07-26 12:24 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-31 11:06 [NOMERGE] [RFC PATCH 00/12] erofs: introduce erofs file system Gao Xiang
2018-06-01 7:48 ` Richard Weinberger
2018-06-01 9:11 ` Gao Xiang
2018-06-01 9:28 ` Richard Weinberger
2018-06-01 11:16 ` Gao Xiang
2018-06-07 10:26 ` Pavel Machek
2018-07-27 0:55 ` Joey Pabalinas
2018-07-27 0:57 ` Joey Pabalinas
2018-07-26 12:21 ` [PATCH 00/25] staging: " Gao Xiang
2018-07-26 12:21 ` [PATCH 01/25] staging: erofs: add on-disk layout Gao Xiang
2018-07-26 12:21 ` [PATCH 02/25] staging: erofs: add erofs in-memory stuffs Gao Xiang
2018-07-26 12:21 ` [PATCH 03/25] staging: erofs: add super block operations Gao Xiang
2018-07-26 12:21 ` [PATCH 04/25] staging: erofs: add raw address_space operations Gao Xiang
2018-07-26 12:21 ` Gao Xiang [this message]
2018-07-26 12:21 ` [PATCH 06/25] staging: erofs: add directory operations Gao Xiang
2018-07-26 12:21 ` [PATCH 07/25] staging: erofs: add namei functions Gao Xiang
2018-07-26 12:21 ` [PATCH 08/25] staging: erofs: update Kconfig and Makefile Gao Xiang
2018-07-26 12:21 ` [PATCH 09/25] staging: erofs: introduce xattr & acl support Gao Xiang
2018-07-26 12:21 ` [PATCH 10/25] staging: erofs: support special inode Gao Xiang
2018-07-26 12:21 ` [PATCH 11/25] staging: erofs: introduce error injection infrastructure Gao Xiang
2018-07-26 12:21 ` [PATCH 12/25] staging: erofs: support tracepoint Gao Xiang
2018-07-26 12:21 ` [PATCH 13/25] staging: erofs: <linux/tagptr.h>: introduce tagged pointer Gao Xiang
2018-07-26 12:21 ` [PATCH 14/25] staging: erofs: introduce pagevec for unzip subsystem Gao Xiang
2018-07-26 12:21 ` [PATCH 15/25] staging: erofs: add erofs_map_blocks_iter Gao Xiang
2018-07-26 12:21 ` [PATCH 16/25] staging: erofs: add erofs_allocpage Gao Xiang
2018-07-26 12:22 ` [PATCH 17/25] staging: erofs: globalize prepare_bio and __submit_bio Gao Xiang
2018-07-26 12:22 ` [PATCH 18/25] staging: erofs: introduce a customized LZ4 decompression Gao Xiang
2018-07-26 12:22 ` [PATCH 19/25] staging: erofs: add a generic z_erofs VLE decompressor Gao Xiang
2018-07-26 12:22 ` [PATCH 20/25] staging: erofs: introduce superblock registration Gao Xiang
2018-07-26 12:22 ` [PATCH 21/25] staging: erofs: introduce erofs shrinker Gao Xiang
2018-07-26 12:22 ` [PATCH 22/25] staging: erofs: introduce workstation for decompression Gao Xiang
2018-07-26 12:22 ` [PATCH 23/25] staging: erofs: introduce VLE decompression support Gao Xiang
2018-07-26 12:22 ` [PATCH 24/25] staging: erofs: introduce cached decompression Gao Xiang
2018-07-26 12:22 ` [PATCH 25/25] staging: erofs: add a TODO and update MAINTAINERS for staging Gao Xiang
2018-07-28 7:10 ` [PATCH] staging: erofs: fix a compile warning of Z_EROFS_VLE_VMAP_ONSTACK_PAGES Gao Xiang
2018-07-28 10:43 ` Chao Yu
2018-07-29 5:34 ` [PATCH 1/2] staging: erofs: fix compile error without built-in decompression support Gao Xiang
2018-07-29 5:37 ` [PATCH 2/2] staging: erofs: fix conditional uninitialized `pcn' in z_erofs_map_blocks_iter Gao Xiang
2018-07-30 1:51 ` [PATCH] staging: erofs: use the wrapped PTR_ERR_OR_ZERO instead of open code Gao Xiang
2018-07-30 6:58 ` Chao Yu
2018-08-01 6:38 ` [PATCH 1/2] staging: erofs: add the missing break in z_erofs_map_blocks_iter Gao Xiang
2018-08-01 6:38 ` [PATCH 2/2] staging: erofs: remove a redundant marco in xattr Gao Xiang
2018-08-01 9:02 ` [PATCH 1/2] staging: erofs: add the missing break in z_erofs_map_blocks_iter Dan Carpenter
2018-08-01 9:19 ` Gao Xiang
2018-08-01 9:36 ` [PATCH RESEND " Gao Xiang
2018-08-01 11:36 ` Dan Carpenter
2018-08-01 12:08 ` Gao Xiang
2018-07-30 2:07 ` [PATCH 2/2] staging: erofs: fix conditional uninitialized `pcn' " Chao Yu
2018-07-30 2:07 ` [PATCH 1/2] staging: erofs: fix compile error without built-in decompression support Chao Yu
2018-07-30 2:32 ` Gao Xiang
2018-07-30 3:07 ` Chao Yu
2018-07-30 3:55 ` Gao Xiang
2018-07-27 0:25 ` [PATCH 00/25] staging: erofs: introduce erofs file system Christian Kujau
2018-07-27 1:39 ` Gao Xiang
2018-07-27 1:56 ` Gao Xiang
2018-07-28 7:25 ` Greg Kroah-Hartman
2018-07-28 9:33 ` Gao Xiang
2018-07-28 10:34 ` Chao Yu
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