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c7acb4c166
When ext4 is using a journal, a metadata block which is deallocated must be passed into the journal layer so it can be dropped from the current transaction and/or revoked. This is done by calling the functions ext4_journal_forget() and ext4_journal_revoke(), which call jbd2_journal_forget(), and jbd2_journal_revoke(), respectively. Since the jbd2_journal_forget() and jbd2_journal_revoke() call bforget(), if ext4 is not using a journal, ext4_journal_forget() and ext4_journal_revoke() must call bforget() to avoid a dirty metadata block overwriting a block after it has been reallocated and reused for another inode's data block. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
106 lines
2.2 KiB
C
106 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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bforget(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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bforget(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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