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Ext4 bug fixes for v4.4, including fixes for post-2038 time encodings,

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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.
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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
This commit is contained in:
Linus Torvalds 2015-12-07 10:25:00 -08:00
commit f41683a204
5 changed files with 56 additions and 13 deletions
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2
fs/ext4/crypto.c
View File

@ -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;

51
fs/ext4/ext4.h
View File

@ -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>
@ -727,19 +728,55 @@ 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;
time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
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;
}
#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \

2
fs/ext4/symlink.c
View File

@ -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) {

2
fs/ext4/sysfs.c
View File

@ -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, \

12
fs/jbd2/transaction.c
View File

@ -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;
}
}