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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
/*
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* Interface between ext4 and JBD
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*/
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#include "ext4_jbd2.h"
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int __ext4_journal_get_undo_access(const char *where, handle_t *handle,
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struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_get_undo_access(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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}
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return err;
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}
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int __ext4_journal_get_write_access(const char *where, handle_t *handle,
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struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_get_write_access(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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}
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return err;
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}
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int __ext4_journal_forget(const char *where, handle_t *handle,
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struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_forget(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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}
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else
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brelse(bh);
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return err;
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}
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int __ext4_journal_revoke(const char *where, handle_t *handle,
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ext4_fsblk_t blocknr, struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_revoke(handle, blocknr, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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}
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else
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brelse(bh);
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return err;
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}
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int __ext4_journal_get_create_access(const char *where,
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handle_t *handle, struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_get_create_access(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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}
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return err;
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}
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int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
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struct inode *inode, struct buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_dirty_metadata(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, __func__, bh,
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handle, err);
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} else {
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mark_buffer_dirty(bh);
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if (inode && inode_needs_sync(inode)) {
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh)) {
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ext4_error(inode->i_sb, __func__,
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"IO error syncing inode, "
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"inode=%lu, block=%llu",
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inode->i_ino,
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(unsigned long long) bh->b_blocknr);
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err = -EIO;
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}
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}
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}
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return err;
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}
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