summaryrefslogtreecommitdiff
path: root/fs/btrfs
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/btrfs_inode.h32
1 files changed, 18 insertions, 14 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index d32ef248828e..bebb5921b922 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -93,8 +93,9 @@ struct btrfs_inode {
/*
* Lock for counters and all fields used to determine if the inode is in
* the log or not (last_trans, last_sub_trans, last_log_commit,
- * logged_trans), to access/update new_delalloc_bytes and to update the
- * VFS' inode number of bytes used.
+ * logged_trans), to access/update delalloc_bytes, new_delalloc_bytes,
+ * defrag_bytes, disk_i_size, outstanding_extents, csum_bytes and to
+ * update the VFS' inode number of bytes used.
*/
spinlock_t lock;
@@ -117,7 +118,7 @@ struct btrfs_inode {
* Counters to keep track of the number of extent item's we may use due
* to delalloc and such. outstanding_extents is the number of extent
* items we think we'll end up using, and reserved_extents is the number
- * of extent items we've reserved metadata for.
+ * of extent items we've reserved metadata for. Protected by 'lock'.
*/
unsigned outstanding_extents;
@@ -143,28 +144,31 @@ struct btrfs_inode {
u64 generation;
/*
- * transid of the trans_handle that last modified this inode
+ * ID of the transaction handle that last modified this inode.
+ * Protected by 'lock'.
*/
u64 last_trans;
/*
- * transid that last logged this inode
+ * ID of the transaction that last logged this inode.
+ * Protected by 'lock'.
*/
u64 logged_trans;
/*
- * log transid when this inode was last modified
+ * Log transaction ID when this inode was last modified.
+ * Protected by 'lock'.
*/
int last_sub_trans;
- /* a local copy of root's last_log_commit */
+ /* A local copy of root's last_log_commit. Protected by 'lock'. */
int last_log_commit;
union {
/*
* Total number of bytes pending delalloc, used by stat to
* calculate the real block usage of the file. This is used
- * only for files.
+ * only for files. Protected by 'lock'.
*/
u64 delalloc_bytes;
/*
@@ -182,7 +186,7 @@ struct btrfs_inode {
* Total number of bytes pending delalloc that fall within a file
* range that is either a hole or beyond EOF (and no prealloc extent
* exists in the range). This is always <= delalloc_bytes and this
- * is used only for files.
+ * is used only for files. Protected by 'lock'.
*/
u64 new_delalloc_bytes;
/*
@@ -193,15 +197,15 @@ struct btrfs_inode {
};
/*
- * total number of bytes pending defrag, used by stat to check whether
- * it needs COW.
+ * Total number of bytes pending defrag, used by stat to check whether
+ * it needs COW. Protected by 'lock'.
*/
u64 defrag_bytes;
/*
- * the size of the file stored in the metadata on disk. data=ordered
+ * The size of the file stored in the metadata on disk. data=ordered
* means the in-memory i_size might be larger than the size on disk
- * because not all the blocks are written yet.
+ * because not all the blocks are written yet. Protected by 'lock'.
*/
u64 disk_i_size;
@@ -235,7 +239,7 @@ struct btrfs_inode {
/*
* Number of bytes outstanding that are going to need csums. This is
- * used in ENOSPC accounting.
+ * used in ENOSPC accounting. Protected by 'lock'.
*/
u64 csum_bytes;