Commit 0db1ff22 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: add shutdown bit and check for it 



Add a shutdown bit that will cause ext4 processing to fail immediately
with EIO.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 9549a168

fs/ext4/ext4.h

+6 −0
Original line number Diff line number Diff line
@@ -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);

}





/*

fs/ext4/ext4_jbd2.c

+11 −0
Original line number Diff line number Diff line
@@ -43,6 +43,10 @@ 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);
@@ -161,6 +165,13 @@ int __ext4_journal_get_write_access(const char *where, unsigned int line, 
	might_sleep();



	if (ext4_handle_valid(handle)) {

		struct super_block *sb;



		sb = handle->h_transaction->t_journal->j_private;

		if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) {

			jbd2_journal_abort_handle(handle);

			return -EIO;

		}

		err = jbd2_journal_get_write_access(handle, bh);

		if (err)

			ext4_journal_abort_handle(where, line, __func__, bh,

fs/ext4/file.c

+12 −0
Original line number Diff line number Diff line
@@ -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;

fs/ext4/fsync.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

fs/ext4/ialloc.c

+3 −0
Original line number Diff line number Diff line
@@ -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))) {