mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 10:14:23 +08:00
e6b5d30104
We found a problem with buffer head reference leaks when using an ext4 partition without a journal. In particular, calls to ext4_forget() would not to a brelse() on the input buffer head, which will cause pages they belong to to not be reclaimable. Further investigation showed that all places where ext4_journal_forget() and ext4_journal_revoke() are called are subject to the same problem. The patch below changes __ext4_journal_forget/__ext4_journal_revoke to do an explicit release of the buffer head when the journal handle isn't valid. Signed-off-by: Curt Wohlgemuth <curtw@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
/*
|
|
* Interface between ext4 and JBD
|
|
*/
|
|
|
|
#include "ext4_jbd2.h"
|
|
|
|
int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_undo_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_get_write_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_write_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_forget(const char *where, handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_forget(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
else
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_revoke(const char *where, handle_t *handle,
|
|
ext4_fsblk_t blocknr, struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_revoke(handle, blocknr, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
else
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
|
|
int __ext4_journal_get_create_access(const char *where,
|
|
handle_t *handle, struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_get_create_access(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
|
|
struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
int err = 0;
|
|
|
|
if (ext4_handle_valid(handle)) {
|
|
err = jbd2_journal_dirty_metadata(handle, bh);
|
|
if (err)
|
|
ext4_journal_abort_handle(where, __func__, bh,
|
|
handle, err);
|
|
} else {
|
|
mark_buffer_dirty(bh);
|
|
if (inode && inode_needs_sync(inode)) {
|
|
sync_dirty_buffer(bh);
|
|
if (buffer_req(bh) && !buffer_uptodate(bh)) {
|
|
ext4_error(inode->i_sb, __func__,
|
|
"IO error syncing inode, "
|
|
"inode=%lu, block=%llu",
|
|
inode->i_ino,
|
|
(unsigned long long) bh->b_blocknr);
|
|
err = -EIO;
|
|
}
|
|
}
|
|
}
|
|
return err;
|
|
}
|