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btrfs: use a negative value for BTRFS_LOG_FORCE_COMMIT
Currently we use the value 1 for BTRFS_LOG_FORCE_COMMIT, but that value has a few inconveniences: 1) If it's ever used by btrfs_log_inode(), or any function down the call chain, we have to remember to btrfs_set_log_full_commit(), which is repetitive and has a chance to be forgotten in future use cases. btrfs_log_inode_parent() only calls btrfs_set_log_full_commit() when it gets a negative value from btrfs_log_inode(); 2) Down the call chain of btrfs_log_inode(), we may have functions that need to force a log commit, but can return either an error (negative value), false (0) or true (1). So they are forced to return some random negative to force a log commit - using BTRFS_LOG_FORCE_COMMIT would make the intention more clear. Currently the only example is flush_dir_items_batch(). So turn BTRFS_LOG_FORCE_COMMIT into a negative value. The chosen value is -(MAX_ERRNO + 1), so that it does not overlap any errno value and makes it easier to debug. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -3652,11 +3652,10 @@ static int flush_dir_items_batch(struct btrfs_trans_handle *trans,
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/*
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* If for some unexpected reason the last item's index is not greater
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* than the last index we logged, warn and return an error to fallback
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* to a transaction commit.
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* than the last index we logged, warn and force a transaction commit.
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*/
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if (WARN_ON(last_index <= inode->last_dir_index_offset))
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ret = -EUCLEAN;
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ret = BTRFS_LOG_FORCE_COMMIT;
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else
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inode->last_dir_index_offset = last_index;
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out:
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@ -5604,10 +5603,8 @@ static int add_conflicting_inode(struct btrfs_trans_handle *trans,
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* LOG_INODE_EXISTS mode) and slow down other fsyncs or transaction
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* commits.
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*/
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if (ctx->num_conflict_inodes >= MAX_CONFLICT_INODES) {
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btrfs_set_log_full_commit(trans);
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if (ctx->num_conflict_inodes >= MAX_CONFLICT_INODES)
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return BTRFS_LOG_FORCE_COMMIT;
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}
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inode = btrfs_iget(root->fs_info->sb, ino, root);
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/*
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@ -6466,7 +6463,6 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
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* result in losing the file after a log replay.
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*/
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if (full_dir_logging && inode->last_unlink_trans >= trans->transid) {
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btrfs_set_log_full_commit(trans);
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ret = BTRFS_LOG_FORCE_COMMIT;
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goto out_unlock;
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}
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@ -13,8 +13,13 @@
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/* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
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#define BTRFS_NO_LOG_SYNC 256
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/* We can't use the tree log for whatever reason, force a transaction commit */
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#define BTRFS_LOG_FORCE_COMMIT (1)
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/*
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* We can't use the tree log for whatever reason, force a transaction commit.
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* We use a negative value because there are functions through the logging code
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* that need to return an error (< 0 value), false (0) or true (1). Any negative
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* value will do, as it will cause the log to be marked for a full sync.
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*/
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#define BTRFS_LOG_FORCE_COMMIT (-(MAX_ERRNO + 1))
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struct btrfs_log_ctx {
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int log_ret;
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