Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
new file mode 100644
index 0000000..3350ab6
--- /dev/null
+++ b/fs/erofs/inode.c
@@ -0,0 +1,337 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2018 HUAWEI, Inc.
+ * http://www.huawei.com/
+ * Created by Gao Xiang <gaoxiang25@huawei.com>
+ */
+#include "xattr.h"
+
+#include <trace/events/erofs.h>
+
+/* no locking */
+static int erofs_read_inode(struct inode *inode, void *data)
+{
+ struct erofs_inode *vi = EROFS_I(inode);
+ struct erofs_inode_compact *dic = data;
+ struct erofs_inode_extended *die;
+
+ const unsigned int ifmt = le16_to_cpu(dic->i_format);
+ struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
+ erofs_blk_t nblks = 0;
+
+ vi->datalayout = erofs_inode_datalayout(ifmt);
+
+ if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
+ erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
+ vi->datalayout, vi->nid);
+ DBG_BUGON(1);
+ return -EOPNOTSUPP;
+ }
+
+ switch (erofs_inode_version(ifmt)) {
+ case EROFS_INODE_LAYOUT_EXTENDED:
+ die = data;
+
+ vi->inode_isize = sizeof(struct erofs_inode_extended);
+ vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
+
+ inode->i_mode = le16_to_cpu(die->i_mode);
+ switch (inode->i_mode & S_IFMT) {
+ case S_IFREG:
+ case S_IFDIR:
+ case S_IFLNK:
+ vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ inode->i_rdev =
+ new_decode_dev(le32_to_cpu(die->i_u.rdev));
+ break;
+ case S_IFIFO:
+ case S_IFSOCK:
+ inode->i_rdev = 0;
+ break;
+ default:
+ goto bogusimode;
+ }
+ i_uid_write(inode, le32_to_cpu(die->i_uid));
+ i_gid_write(inode, le32_to_cpu(die->i_gid));
+ set_nlink(inode, le32_to_cpu(die->i_nlink));
+
+ /* ns timestamp */
+ inode->i_mtime.tv_sec = inode->i_ctime.tv_sec =
+ le64_to_cpu(die->i_ctime);
+ inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec =
+ le32_to_cpu(die->i_ctime_nsec);
+
+ inode->i_size = le64_to_cpu(die->i_size);
+
+ /* total blocks for compressed files */
+ if (erofs_inode_is_data_compressed(vi->datalayout))
+ nblks = le32_to_cpu(die->i_u.compressed_blocks);
+ break;
+ case EROFS_INODE_LAYOUT_COMPACT:
+ vi->inode_isize = sizeof(struct erofs_inode_compact);
+ vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
+
+ inode->i_mode = le16_to_cpu(dic->i_mode);
+ switch (inode->i_mode & S_IFMT) {
+ case S_IFREG:
+ case S_IFDIR:
+ case S_IFLNK:
+ vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ inode->i_rdev =
+ new_decode_dev(le32_to_cpu(dic->i_u.rdev));
+ break;
+ case S_IFIFO:
+ case S_IFSOCK:
+ inode->i_rdev = 0;
+ break;
+ default:
+ goto bogusimode;
+ }
+ i_uid_write(inode, le16_to_cpu(dic->i_uid));
+ i_gid_write(inode, le16_to_cpu(dic->i_gid));
+ set_nlink(inode, le16_to_cpu(dic->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(dic->i_size);
+ if (erofs_inode_is_data_compressed(vi->datalayout))
+ nblks = le32_to_cpu(dic->i_u.compressed_blocks);
+ break;
+ default:
+ erofs_err(inode->i_sb,
+ "unsupported on-disk inode version %u of nid %llu",
+ erofs_inode_version(ifmt), vi->nid);
+ DBG_BUGON(1);
+ return -EOPNOTSUPP;
+ }
+
+ if (!nblks)
+ /* measure inode.i_blocks as generic filesystems */
+ inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
+ else
+ inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
+ return 0;
+
+bogusimode:
+ erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
+ inode->i_mode, vi->nid);
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+}
+
+static int erofs_fill_symlink(struct inode *inode, void *data,
+ unsigned int m_pofs)
+{
+ struct erofs_inode *vi = EROFS_I(inode);
+ char *lnk;
+
+ /* if it cannot be handled with fast symlink scheme */
+ if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
+ inode->i_size >= PAGE_SIZE) {
+ inode->i_op = &erofs_symlink_iops;
+ return 0;
+ }
+
+ lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
+ if (!lnk)
+ return -ENOMEM;
+
+ m_pofs += vi->inode_isize + vi->xattr_isize;
+ /* inline symlink data shouldn't cross page boundary as well */
+ if (m_pofs + inode->i_size > PAGE_SIZE) {
+ kfree(lnk);
+ erofs_err(inode->i_sb,
+ "inline data cross block boundary @ nid %llu",
+ vi->nid);
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+ }
+
+ memcpy(lnk, data + m_pofs, inode->i_size);
+ lnk[inode->i_size] = '\0';
+
+ inode->i_link = lnk;
+ inode->i_op = &erofs_fast_symlink_iops;
+ return 0;
+}
+
+static int erofs_fill_inode(struct inode *inode, int isdir)
+{
+ struct super_block *sb = inode->i_sb;
+ struct erofs_inode *vi = EROFS_I(inode);
+ struct page *page;
+ void *data;
+ int err;
+ erofs_blk_t blkaddr;
+ unsigned int ofs;
+ erofs_off_t inode_loc;
+
+ trace_erofs_fill_inode(inode, isdir);
+ inode_loc = iloc(EROFS_SB(sb), vi->nid);
+ blkaddr = erofs_blknr(inode_loc);
+ ofs = erofs_blkoff(inode_loc);
+
+ erofs_dbg("%s, reading inode nid %llu at %u of blkaddr %u",
+ __func__, vi->nid, ofs, blkaddr);
+
+ page = erofs_get_meta_page(sb, blkaddr);
+
+ if (IS_ERR(page)) {
+ erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
+ vi->nid, PTR_ERR(page));
+ return PTR_ERR(page);
+ }
+
+ DBG_BUGON(!PageUptodate(page));
+ data = page_address(page);
+
+ err = erofs_read_inode(inode, data + ofs);
+ if (err)
+ goto out_unlock;
+
+ /* setup the new inode */
+ switch (inode->i_mode & S_IFMT) {
+ case S_IFREG:
+ inode->i_op = &erofs_generic_iops;
+ inode->i_fop = &generic_ro_fops;
+ break;
+ case S_IFDIR:
+ inode->i_op = &erofs_dir_iops;
+ inode->i_fop = &erofs_dir_fops;
+ break;
+ case S_IFLNK:
+ err = erofs_fill_symlink(inode, data, ofs);
+ if (err)
+ goto out_unlock;
+ inode_nohighmem(inode);
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFIFO:
+ case S_IFSOCK:
+ inode->i_op = &erofs_generic_iops;
+ init_special_inode(inode, inode->i_mode, inode->i_rdev);
+ goto out_unlock;
+ default:
+ err = -EFSCORRUPTED;
+ goto out_unlock;
+ }
+
+ if (erofs_inode_is_data_compressed(vi->datalayout)) {
+ err = z_erofs_fill_inode(inode);
+ goto out_unlock;
+ }
+ inode->i_mapping->a_ops = &erofs_raw_access_aops;
+
+out_unlock:
+ unlock_page(page);
+ put_page(page);
+ return err;
+}
+
+/*
+ * erofs nid is 64bits, but i_ino is 'unsigned long', therefore
+ * we should do more for 32-bit platform to find the right inode.
+ */
+static int erofs_ilookup_test_actor(struct inode *inode, void *opaque)
+{
+ const erofs_nid_t nid = *(erofs_nid_t *)opaque;
+
+ return EROFS_I(inode)->nid == nid;
+}
+
+static int erofs_iget_set_actor(struct inode *inode, void *opaque)
+{
+ const erofs_nid_t nid = *(erofs_nid_t *)opaque;
+
+ inode->i_ino = erofs_inode_hash(nid);
+ return 0;
+}
+
+static inline struct inode *erofs_iget_locked(struct super_block *sb,
+ erofs_nid_t nid)
+{
+ const unsigned long hashval = erofs_inode_hash(nid);
+
+ return iget5_locked(sb, hashval, erofs_ilookup_test_actor,
+ erofs_iget_set_actor, &nid);
+}
+
+struct inode *erofs_iget(struct super_block *sb,
+ erofs_nid_t nid,
+ bool isdir)
+{
+ struct inode *inode = erofs_iget_locked(sb, nid);
+
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_state & I_NEW) {
+ int err;
+ struct erofs_inode *vi = EROFS_I(inode);
+
+ vi->nid = nid;
+
+ err = erofs_fill_inode(inode, isdir);
+ if (!err)
+ unlock_new_inode(inode);
+ else {
+ iget_failed(inode);
+ inode = ERR_PTR(err);
+ }
+ }
+ return inode;
+}
+
+int erofs_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ struct inode *const inode = d_inode(path->dentry);
+
+ if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
+ stat->attributes |= STATX_ATTR_COMPRESSED;
+
+ stat->attributes |= STATX_ATTR_IMMUTABLE;
+ stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
+ STATX_ATTR_IMMUTABLE);
+
+ generic_fillattr(inode, stat);
+ return 0;
+}
+
+const struct inode_operations erofs_generic_iops = {
+ .getattr = erofs_getattr,
+#ifdef CONFIG_EROFS_FS_XATTR
+ .listxattr = erofs_listxattr,
+#endif
+ .get_acl = erofs_get_acl,
+};
+
+const struct inode_operations erofs_symlink_iops = {
+ .get_link = page_get_link,
+ .getattr = erofs_getattr,
+#ifdef CONFIG_EROFS_FS_XATTR
+ .listxattr = erofs_listxattr,
+#endif
+ .get_acl = erofs_get_acl,
+};
+
+const struct inode_operations erofs_fast_symlink_iops = {
+ .get_link = simple_get_link,
+ .getattr = erofs_getattr,
+#ifdef CONFIG_EROFS_FS_XATTR
+ .listxattr = erofs_listxattr,
+#endif
+ .get_acl = erofs_get_acl,
+};
+