Commit f41683a2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 

Pull ext4 fixes from Ted Ts'o:
 "Ext4 bug fixes for v4.4, including fixes for post-2038 time encodings,
  some endian conversion problems with ext4 encryption, potential memory
  leaks after truncate in data=journal mode, and an ocfs2 regression
  caused by a jbd2 performance improvement"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  jbd2: fix null committed data return in undo_access
  ext4: add "static" to ext4_seq_##name##_fops struct
  ext4: fix an endianness bug in ext4_encrypted_follow_link()
  ext4: fix an endianness bug in ext4_encrypted_zeroout()
  jbd2: Fix unreclaimed pages after truncate in data=journal mode
  ext4: Fix handling of extended tv_sec
parents 527e9316 087ffd4e

fs/ext4/crypto.c

+1 −1
Original line number Diff line number Diff line
@@ -389,7 +389,7 @@ int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex) 
	struct ext4_crypto_ctx	*ctx;

	struct page		*ciphertext_page = NULL;

	struct bio		*bio;

	ext4_lblk_t		lblk = ex->ee_block;

	ext4_lblk_t		lblk = le32_to_cpu(ex->ee_block);

	ext4_fsblk_t		pblk = ext4_ext_pblock(ex);

	unsigned int		len = ext4_ext_get_actual_len(ex);

	int			ret, err = 0;

fs/ext4/ext4.h

+44 −7
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/seqlock.h>

#include <linux/mutex.h>

#include <linux/timer.h>

#include <linux/version.h>

#include <linux/wait.h>

#include <linux/blockgroup_lock.h>

#include <linux/percpu_counter.h>
@@ -727,18 +728,54 @@ struct move_extent { 
	<= (EXT4_GOOD_OLD_INODE_SIZE +			\

	    (einode)->i_extra_isize))			\



/*

 * We use an encoding that preserves the times for extra epoch "00":

 *

 * extra  msb of                         adjust for signed

 * epoch  32-bit                         32-bit tv_sec to

 * bits   time    decoded 64-bit tv_sec  64-bit tv_sec      valid time range

 * 0 0    1    -0x80000000..-0x00000001  0x000000000 1901-12-13..1969-12-31

 * 0 0    0    0x000000000..0x07fffffff  0x000000000 1970-01-01..2038-01-19

 * 0 1    1    0x080000000..0x0ffffffff  0x100000000 2038-01-19..2106-02-07

 * 0 1    0    0x100000000..0x17fffffff  0x100000000 2106-02-07..2174-02-25

 * 1 0    1    0x180000000..0x1ffffffff  0x200000000 2174-02-25..2242-03-16

 * 1 0    0    0x200000000..0x27fffffff  0x200000000 2242-03-16..2310-04-04

 * 1 1    1    0x280000000..0x2ffffffff  0x300000000 2310-04-04..2378-04-22

 * 1 1    0    0x300000000..0x37fffffff  0x300000000 2378-04-22..2446-05-10

 *

 * Note that previous versions of the kernel on 64-bit systems would

 * incorrectly use extra epoch bits 1,1 for dates between 1901 and

 * 1970.  e2fsck will correct this, assuming that it is run on the

 * affected filesystem before 2242.

 */



static inline __le32 ext4_encode_extra_time(struct timespec *time)

{

       return cpu_to_le32((sizeof(time->tv_sec) > 4 ?

			   (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |

                          ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));

	u32 extra = sizeof(time->tv_sec) > 4 ?

		((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK : 0;

	return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));

}



static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)

{

       if (sizeof(time->tv_sec) > 4)

	       time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)

			       << 32;

	if (unlikely(sizeof(time->tv_sec) > 4 &&

			(extra & cpu_to_le32(EXT4_EPOCH_MASK)))) {

#if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)

		/* Handle legacy encoding of pre-1970 dates with epoch

		 * bits 1,1.  We assume that by kernel version 4.20,

		 * everyone will have run fsck over the affected

		 * filesystems to correct the problem.  (This

		 * backwards compatibility may be removed before this

		 * time, at the discretion of the ext4 developers.)

		 */

		u64 extra_bits = le32_to_cpu(extra) & EXT4_EPOCH_MASK;

		if (extra_bits == 3 && ((time->tv_sec) & 0x80000000) != 0)

			extra_bits = 0;

		time->tv_sec += extra_bits << 32;

#else

		time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;

#endif

	}

	time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;

}

fs/ext4/symlink.c

+1 −1
Original line number Diff line number Diff line
@@ -52,7 +52,7 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook 
	/* Symlink is encrypted */

	sd = (struct ext4_encrypted_symlink_data *)caddr;

	cstr.name = sd->encrypted_path;

	cstr.len  = le32_to_cpu(sd->len);

	cstr.len  = le16_to_cpu(sd->len);

	if ((cstr.len +

	     sizeof(struct ext4_encrypted_symlink_data) - 1) >

	    max_size) {

fs/ext4/sysfs.c

+1 −1
Original line number Diff line number Diff line
@@ -358,7 +358,7 @@ static int name##_open(struct inode *inode, struct file *file) \ 
	return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \

} \

\

const struct file_operations ext4_seq_##name##_fops = { \

static const struct file_operations ext4_seq_##name##_fops = { \

	.owner		= THIS_MODULE, \

	.open		= name##_open, \

	.read		= seq_read, \

fs/jbd2/transaction.c

+9 −3
Original line number Diff line number Diff line
@@ -1009,7 +1009,8 @@ out: 
}



/* Fast check whether buffer is already attached to the required transaction */

static bool jbd2_write_access_granted(handle_t *handle, struct buffer_head *bh)

static bool jbd2_write_access_granted(handle_t *handle, struct buffer_head *bh,

							bool undo)

{

	struct journal_head *jh;

	bool ret = false;
@@ -1036,6 +1037,9 @@ static bool jbd2_write_access_granted(handle_t *handle, struct buffer_head *bh) 
	jh = READ_ONCE(bh->b_private);

	if (!jh)

		goto out;

	/* For undo access buffer must have data copied */

	if (undo && !jh->b_committed_data)

		goto out;

	if (jh->b_transaction != handle->h_transaction &&

	    jh->b_next_transaction != handle->h_transaction)

		goto out;
@@ -1073,7 +1077,7 @@ int jbd2_journal_get_write_access(handle_t *handle, struct buffer_head *bh) 
	struct journal_head *jh;

	int rc;



	if (jbd2_write_access_granted(handle, bh))

	if (jbd2_write_access_granted(handle, bh, false))

		return 0;



	jh = jbd2_journal_add_journal_head(bh);
@@ -1210,7 +1214,7 @@ int jbd2_journal_get_undo_access(handle_t *handle, struct buffer_head *bh) 
	char *committed_data = NULL;



	JBUFFER_TRACE(jh, "entry");

	if (jbd2_write_access_granted(handle, bh))

	if (jbd2_write_access_granted(handle, bh, true))

		return 0;



	jh = jbd2_journal_add_journal_head(bh);
@@ -2152,6 +2156,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh, 


		if (!buffer_dirty(bh)) {

			/* bdflush has written it.  We can drop it now */

			__jbd2_journal_remove_checkpoint(jh);

			goto zap_buffer;

		}
@@ -2181,6 +2186,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh, 
				/* The orphan record's transaction has

				 * committed.  We can cleanse this buffer */

				clear_buffer_jbddirty(bh);

				__jbd2_journal_remove_checkpoint(jh);

				goto zap_buffer;

			}

		}

CRA Git | Maintained and supported by SUSTech CRA and CCSE