Author: Trond Myklebust <[EMAIL PROTECTED]>
AuthorDate: Wed Dec 13 15:23:48 2006 -0500
Committer: Trond Myklebust <[EMAIL PROTECTED]>
CommitDate: Sat Feb 3 15:35:07 2007 -0800
NFS: Fixup some outdated comments...
Signed-off-by: Trond Myklebust <[EMAIL PROTECTED]>
fs/nfs/write.c | 42 +-----------------------------------------
1 files changed, 1 insertions(+), 41 deletions(-)
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f983c51..e9eff93 100644
@@ -1,47 +1,7 @@
- * Writing file data over NFS.
- * We do it like this: When a (user) process wishes to write data to an
- * NFS file, a write request is allocated that contains the RPC task data
- * plus some info on the page to be written, and added to the inode's
- * write chain. If the process writes past the end of the page, an async
- * RPC call to write the page is scheduled immediately; otherwise, the call
- * is delayed for a few seconds.
- * Just like readahead, no async I/O is performed if wsize < PAGE_SIZE.
- * Write requests are kept on the inode's writeback list. Each entry in
- * that list references the page (portion) to be written. When the
- * cache timeout has expired, the RPC task is woken up, and tries to
- * lock the page. As soon as it manages to do so, the request is moved
- * from the writeback list to the writelock list.
- * Note: we must make sure never to confuse the inode passed in the
- * write_page request with the one in page->inode. As far as I understand
- * it, these are different when doing a swap-out.
- * To understand everything that goes on here and in the NFS read code,
- * one should be aware that a page is locked in exactly one of the following
- * cases:
- * - A write request is in progress.
- * - A user process is in generic_file_write/nfs_update_page
- * - A user process is in generic_file_read
- * Also note that because of the way pages are invalidated in
- * nfs_revalidate_inode, the following assertions hold:
- * - If a page is dirty, there will be no read requests (a page will
- * not be re-read unless invalidated by nfs_revalidate_inode).
- * - If the page is not uptodate, there will be no pending write
- * requests, and no process will be in nfs_update_page.
- * FIXME: Interaction with the vmscan routines is not optimal yet.
- * Either vmscan must be made nfs-savvy, or we need a different page
- * reclaim concept that supports something like FS-independent
- * buffer_heads with a b_ops-> field.
+ * Write file data over NFS.
* Copyright (C) 1996, 1997, Olaf Kirch <[EMAIL PROTECTED]>
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