Btrfs: use signed integer instead of unsigned long integer for log transid
The log trans id is initialized to be 0 every time we create a log tree, and the log tree need be re-created after a new transaction is started, it means the log trans id is unlikely to be a huge number, so we can use signed integer instead of unsigned long integer to save a bit space. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
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7483e1a446
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bb14a59b61
fs/btrfs
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@ -108,16 +108,19 @@ struct btrfs_inode {
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*/
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*/
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u64 last_trans;
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u64 last_trans;
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/*
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* log transid when this inode was last modified
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*/
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u64 last_sub_trans;
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/*
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/*
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* transid that last logged this inode
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* transid that last logged this inode
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*/
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*/
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u64 logged_trans;
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u64 logged_trans;
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/*
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* log transid when this inode was last modified
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*/
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int last_sub_trans;
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/* a local copy of root's last_log_commit */
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int last_log_commit;
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/* total number of bytes pending delalloc, used by stat to calc the
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/* total number of bytes pending delalloc, used by stat to calc the
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* real block usage of the file
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* real block usage of the file
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*/
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*/
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@ -155,9 +158,6 @@ struct btrfs_inode {
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/* flags field from the on disk inode */
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/* flags field from the on disk inode */
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u32 flags;
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u32 flags;
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/* a local copy of root's last_log_commit */
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unsigned long last_log_commit;
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/*
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/*
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* Counters to keep track of the number of extent item's we may use due
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* Counters to keep track of the number of extent item's we may use due
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* to delalloc and such. outstanding_extents is the number of extent
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* to delalloc and such. outstanding_extents is the number of extent
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@ -1721,8 +1721,8 @@ struct btrfs_root {
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atomic_t log_writers;
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atomic_t log_writers;
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atomic_t log_commit[2];
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atomic_t log_commit[2];
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atomic_t log_batch;
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atomic_t log_batch;
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unsigned long log_transid;
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int log_transid;
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unsigned long last_log_commit;
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int last_log_commit;
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pid_t log_start_pid;
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pid_t log_start_pid;
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bool log_multiple_pids;
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bool log_multiple_pids;
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@ -2362,7 +2362,7 @@ static int update_log_root(struct btrfs_trans_handle *trans,
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}
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}
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static int wait_log_commit(struct btrfs_trans_handle *trans,
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static int wait_log_commit(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, unsigned long transid)
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struct btrfs_root *root, int transid)
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{
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{
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DEFINE_WAIT(wait);
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DEFINE_WAIT(wait);
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int index = transid % 2;
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int index = transid % 2;
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@ -2434,7 +2434,7 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
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int ret;
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int ret;
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struct btrfs_root *log = root->log_root;
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struct btrfs_root *log = root->log_root;
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struct btrfs_root *log_root_tree = root->fs_info->log_root_tree;
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struct btrfs_root *log_root_tree = root->fs_info->log_root_tree;
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unsigned long log_transid = 0;
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int log_transid = 0;
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struct blk_plug plug;
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struct blk_plug plug;
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mutex_lock(&root->log_mutex);
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mutex_lock(&root->log_mutex);
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