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Added links for a code walk.

geesefs-0-30-9
Aaron Jacobs 2015-03-06 22:45:16 -06:00
parent 5b07c5da52
commit 659e2e61bd
1 changed files with 12 additions and 10 deletions
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22
file_system.go
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@ -171,25 +171,27 @@ type FileSystem interface {
// page via the FUSE VFS layer, causing this method to be called:
//
// * The kernel calls address_space_operations::writepage when a dirty page
// needs to be written to backing store (see vfs.txt). Fuse sets this to
// fuse_writepage (see file.c).
// needs to be written to backing store (cf. http://goo.gl/Ezbewg). Fuse
// sets this to fuse_writepage (cf. http://goo.gl/IeNvLT).
//
// * fuse_writepage calls fuse_writepage_locked.
// * (http://goo.gl/Eestuy) fuse_writepage calls fuse_writepage_locked.
//
// * fuse_writepage_locked makes a write request to the userspace server.
// * (http://goo.gl/RqYIxY) fuse_writepage_locked makes a write request to
// the userspace server.
//
// Note that writes *will* be received before a call to Flush when closing
// the file descriptor to which they were written:
//
// * fuse_flush calls write_inode_now, which appears to start a writeback
// in the background (it talks about a "flusher thread").
// * (http://goo.gl/PheZjf) fuse_flush calls write_inode_now, which appears
// to start a writeback in the background (it talks about a "flusher
// thread").
//
// * fuse_flush then calls fuse_sync_writes, which "[waits] for all pending
// writepages on the inode to finish".
// * (http://goo.gl/1IiepM) fuse_flush then calls fuse_sync_writes, which
// "[waits] for all pending writepages on the inode to finish".
//
// * Only then does fuse_flush finally send the flush request.
// * (http://goo.gl/zzvxWv) Only then does fuse_flush finally send the
// flush request.
//
// TODO(jacobsa): Add links for all of the references above.
WriteFile(
ctx context.Context,
req *WriteFileRequest) (*WriteFileResponse, error)