diff options
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/btrfs_inode.h | 32 |
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; |