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Btrfs: add and improve comments

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This improves the comments at the top of many functions.  It didn't
dive into the guts of functions because I was trying to
avoid merging problems with the new allocator and back reference work.

extent-tree.c and volumes.c were both skipped, and there is definitely
more work todo in cleaning and commenting the code.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-09-29 15:18:18 -04:00
parent 9a5e1ea1e1
commit d352ac6814
25 changed files with 653 additions and 277 deletions
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54
fs/btrfs/btrfs_inode.h
View File

@@ -25,27 +25,58 @@
/* in memory btrfs inode */
struct btrfs_inode {
/* which subvolume this inode belongs to */
struct btrfs_root *root;
/* the block group preferred for allocations. This pointer is buggy
* and needs to be replaced with a bytenr instead
*/
struct btrfs_block_group_cache *block_group;
/* key used to find this inode on disk. This is used by the code
* to read in roots of subvolumes
*/
struct btrfs_key location;
/* the extent_tree has caches of all the extent mappings to disk */
struct extent_map_tree extent_tree;
/* the io_tree does range state (DIRTY, LOCKED etc) */
struct extent_io_tree io_tree;
/* special utility tree used to record which mirrors have already been
* tried when checksums fail for a given block
*/
struct extent_io_tree io_failure_tree;
/* held while inserting checksums to avoid races */
struct mutex csum_mutex;
/* held while inesrting or deleting extents from files */
struct mutex extent_mutex;
/* held while logging the inode in tree-log.c */
struct mutex log_mutex;
struct inode vfs_inode;
/* used to order data wrt metadata */
struct btrfs_ordered_inode_tree ordered_tree;
/* standard acl pointers */
struct posix_acl *i_acl;
struct posix_acl *i_default_acl;
/* for keeping track of orphaned inodes */
struct list_head i_orphan;
/* list of all the delalloc inodes in the FS. There are times we need
* to write all the delalloc pages to disk, and this list is used
* to walk them all.
*/
struct list_head delalloc_inodes;
/* full 64 bit generation number */
/* full 64 bit generation number, struct vfs_inode doesn't have a big
* enough field for this.
*/
u64 generation;
/*
@@ -57,10 +88,25 @@ struct btrfs_inode {
*/
u64 logged_trans;
/* trans that last made a change that should be fully fsync'd */
/*
* trans that last made a change that should be fully fsync'd. This
* gets reset to zero each time the inode is logged
*/
u64 log_dirty_trans;
/* total number of bytes pending delalloc, used by stat to calc the
* real block usage of the file
*/
u64 delalloc_bytes;
/*
* 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.
*/
u64 disk_i_size;
/* flags field from the on disk inode */
u32 flags;
/*
@@ -68,6 +114,8 @@ struct btrfs_inode {
* number for new files that are created
*/
u64 index_cnt;
struct inode vfs_inode;
};
static inline struct btrfs_inode *BTRFS_I(struct inode *inode)