Add a shutdown bit that will cause ext4 processing to fail immediately
with EIO.
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
---
fs/ext4/ext4.h | 6 ++++++
fs/ext4/ext4_jbd2.c | 2 ++
fs/ext4/file.c | 12 ++++++++++++
fs/ext4/fsync.c | 3 +++
fs/ext4/ialloc.c | 3 +++
fs/ext4/inode.c | 25 +++++++++++++++++++++++++
fs/ext4/namei.c | 12 ++++++++++++
fs/ext4/xattr.c | 3 +++
8 files changed, 66 insertions(+)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index d5b7b2ccb302..94064b7ce16c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1836,6 +1836,12 @@ static inline bool ext4_has_incompat_features(struct super_block *sb)
* Superblock flags
*/
#define EXT4_FLAGS_RESIZING 0
+#define EXT4_FLAGS_SHUTDOWN 1
+
+static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
+{
+ return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
+}
/*
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index e770c1ee4613..8ea22d066f5c 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -43,6 +43,8 @@ static int ext4_journal_check_start(struct super_block *sb)
journal_t *journal;
might_sleep();
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
+ return -EIO;
if (sb->s_flags & MS_RDONLY)
return -EROFS;
WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index d663d3d7c81c..ff3f6107b0ba 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -57,6 +57,9 @@ static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(file_inode(iocb->ki_filp)->i_sb))))
+ return -EIO;
+
if (!iov_iter_count(to))
return 0; /* skip atime */
@@ -213,6 +216,9 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
int overwrite = 0;
ssize_t ret;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
#ifdef CONFIG_FS_DAX
if (IS_DAX(inode))
return ext4_dax_write_iter(iocb, from);
@@ -348,6 +354,9 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct inode *inode = file->f_mapping->host;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
if (ext4_encrypted_inode(inode)) {
int err = fscrypt_get_encryption_info(inode);
if (err)
@@ -375,6 +384,9 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
char buf[64], *cp;
int ret;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
!(sb->s_flags & MS_RDONLY))) {
sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index 88effb1053c7..9d549608fd30 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -100,6 +100,9 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
tid_t commit_tid;
bool needs_barrier = false;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
J_ASSERT(ext4_journal_current_handle() == NULL);
trace_ext4_sync_file_enter(file, datasync);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index f372fc431b8e..b14bae2598bc 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -764,6 +764,9 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
if (!dir || !dir->i_nlink)
return ERR_PTR(-EPERM);
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
+ return ERR_PTR(-EIO);
+
if ((ext4_encrypted_inode(dir) ||
DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 918d351d5b94..e4416e94fb92 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1189,6 +1189,9 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
pgoff_t index;
unsigned from, to;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
trace_ext4_write_begin(inode, pos, len, flags);
/*
* Reserve one block more for addition to orphan list in case
@@ -2037,6 +2040,9 @@ static int ext4_writepage(struct page *page,
struct ext4_io_submit io_submit;
bool keep_towrite = false;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
trace_ext4_writepage(page);
size = i_size_read(inode);
if (page->index == size >> PAGE_SHIFT)
@@ -2634,6 +2640,9 @@ static int ext4_writepages(struct address_space *mapping,
struct blk_plug plug;
bool give_up_on_write = false;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
percpu_down_read(&sbi->s_journal_flag_rwsem);
trace_ext4_writepages(inode, wbc);
@@ -2895,6 +2904,9 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
handle_t *handle;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
index = pos >> PAGE_SHIFT;
if (ext4_nonda_switch(inode->i_sb) ||
@@ -3199,6 +3211,9 @@ static int ext4_readpage(struct file *file, struct page *page)
int ret = -EAGAIN;
struct inode *inode = page->mapping->host;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
trace_ext4_readpage(page);
if (ext4_has_inline_data(inode))
@@ -3216,6 +3231,9 @@ ext4_readpages(struct file *file, struct address_space *mapping,
{
struct inode *inode = mapping->host;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
/* If the file has inline data, no need to do readpages. */
if (ext4_has_inline_data(inode))
return 0;
@@ -5202,6 +5220,9 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
int orphan = 0;
const unsigned int ia_valid = attr->ia_valid;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
error = setattr_prepare(dentry, attr);
if (error)
return error;
@@ -5488,6 +5509,8 @@ int ext4_mark_iloc_dirty(handle_t *handle,
{
int err = 0;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
if (IS_I_VERSION(inode))
inode_inc_iversion(inode);
@@ -5511,6 +5534,8 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
{
int err;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
err = ext4_get_inode_loc(inode, iloc);
if (!err) {
BUFFER_TRACE(iloc->bh, "get_write_access");
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index af6fa5949193..32906ea1dc6b 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2939,6 +2939,9 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
struct ext4_dir_entry_2 *de;
handle_t *handle = NULL;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
+ return -EIO;
+
/* Initialize quotas before so that eventual writes go in
* separate transaction */
retval = dquot_initialize(dir);
@@ -3012,6 +3015,9 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
struct ext4_dir_entry_2 *de;
handle_t *handle = NULL;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
+ return -EIO;
+
trace_ext4_unlink_enter(dir, dentry);
/* Initialize quotas before so that eventual writes go
* in separate transaction */
@@ -3082,6 +3088,9 @@ static int ext4_symlink(struct inode *dir,
struct fscrypt_str disk_link;
struct fscrypt_symlink_data *sd = NULL;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
+ return -EIO;
+
disk_link.len = len + 1;
disk_link.name = (char *) symname;
@@ -3886,6 +3895,9 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
+ return -EIO;
+
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index c40bd55b6400..67636acf7624 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -411,6 +411,9 @@ ext4_xattr_get(struct inode *inode, int name_index, const char *name,
{
int error;
+ if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
+ return -EIO;
+
if (strlen(name) > 255)
return -ERANGE;
--
2.11.0.rc0.7.gbe5a750
