146 строки
3.6 KiB
C
146 строки
3.6 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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#include <trace/events/ext4.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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/*
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* The ext4 forget function must perform a revoke if we are freeing data
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* which has been journaled. Metadata (eg. indirect blocks) must be
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* revoked in all cases.
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*
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* "bh" may be NULL: a metadata block may have been freed from memory
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* but there may still be a record of it in the journal, and that record
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* still needs to be revoked.
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*
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* If the handle isn't valid we're not journaling, but we still need to
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* call into ext4_journal_revoke() to put the buffer head.
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*/
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int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
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struct inode *inode, struct buffer_head *bh,
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ext4_fsblk_t blocknr)
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{
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int err;
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might_sleep();
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trace_ext4_forget(inode, is_metadata, blocknr);
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BUFFER_TRACE(bh, "enter");
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jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
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"data mode %x\n",
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bh, is_metadata, inode->i_mode,
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test_opt(inode->i_sb, DATA_FLAGS));
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/* In the no journal case, we can just do a bforget and return */
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if (!ext4_handle_valid(handle)) {
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bforget(bh);
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return 0;
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}
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/* Never use the revoke function if we are doing full data
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* journaling: there is no need to, and a V1 superblock won't
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* support it. Otherwise, only skip the revoke on un-journaled
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* data blocks. */
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
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(!is_metadata && !ext4_should_journal_data(inode))) {
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if (bh) {
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BUFFER_TRACE(bh, "call jbd2_journal_forget");
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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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return err;
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}
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return 0;
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}
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/*
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* data!=journal && (is_metadata || should_journal_data(inode))
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*/
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BUFFER_TRACE(bh, "call jbd2_journal_revoke");
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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, handle, err);
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ext4_abort(inode->i_sb, __func__,
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"error %d when attempting revoke", err);
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}
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BUFFER_TRACE(bh, "exit");
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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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if (inode)
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mark_buffer_dirty_inode(bh, inode);
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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,
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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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