Commit 49121471 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

[PATCH] knfsd: Update rpc-cache.txt to match recent changes

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ad1b5229
This document gives a brief introduction to the caching
This document gives a brief introduction to the caching
mechanisms in the sunrpc layer that is used, in particular,
for NFS authentication.
......@@ -25,25 +25,17 @@ The common code handles such things as:
- supporting 'NEGATIVE' as well as positive entries
- allowing an EXPIRED time on cache items, and removing
items after they expire, and are no longe in-use.
Future code extensions are expect to handle
- making requests to user-space to fill in cache entries
- allowing user-space to directly set entries in the cache
- delaying RPC requests that depend on as-yet incomplete
cache entries, and replaying those requests when the cache entry
is complete.
- maintaining last-access times on cache entries
- clean out old entries when the caches become full
The code for performing a cache lookup is also common, but in the form
of a template. i.e. a #define.
Each cache defines a lookup function by using the DefineCacheLookup
macro, or the simpler DefineSimpleCacheLookup macro
- clean out old entries as they expire.
Creating a Cache
----------------
1/ A cache needs a datum to cache. This is in the form of a
1/ A cache needs a datum to store. This is in the form of a
structure definition that must contain a
struct cache_head
as an element, usually the first.
......@@ -51,35 +43,69 @@ Creating a Cache
Each cache element is reference counted and contains
expiry and update times for use in cache management.
2/ A cache needs a "cache_detail" structure that
describes the cache. This stores the hash table, and some
parameters for cache management.
3/ A cache needs a lookup function. This is created using
the DefineCacheLookup macro. This lookup function is used both
to find entries and to update entries. The normal mode for
updating an entry is to replace the old entry with a new
entry. However it is possible to allow update-in-place
for those caches where it makes sense (no atomicity issues
or indirect reference counting issue)
4/ A cache needs to be registered using cache_register(). This
includes in on a list of caches that will be regularly
cleaned to discard old data. For this to work, some
thread must periodically call cache_clean
describes the cache. This stores the hash table, some
parameters for cache management, and some operations detailing how
to work with particular cache items.
The operations requires are:
struct cache_head *alloc(void)
This simply allocates appropriate memory and returns
a pointer to the cache_detail embedded within the
structure
void cache_put(struct kref *)
This is called when the last reference to an item is
is dropped. The pointer passed is to the 'ref' field
in the cache_head. cache_put should release any
references create by 'cache_init' and, if CACHE_VALID
is set, any references created by cache_update.
It should then release the memory allocated by
'alloc'.
int match(struct cache_head *orig, struct cache_head *new)
test if the keys in the two structures match. Return
1 if they do, 0 if they don't.
void init(struct cache_head *orig, struct cache_head *new)
Set the 'key' fields in 'new' from 'orig'. This may
include taking references to shared objects.
void update(struct cache_head *orig, struct cache_head *new)
Set the 'content' fileds in 'new' from 'orig'.
int cache_show(struct seq_file *m, struct cache_detail *cd,
struct cache_head *h)
Optional. Used to provide a /proc file that lists the
contents of a cache. This should show one item,
usually on just one line.
int cache_request(struct cache_detail *cd, struct cache_head *h,
char **bpp, int *blen)
Format a request to be send to user-space for an item
to be instantiated. *bpp is a buffer of size *blen.
bpp should be moved forward over the encoded message,
and *blen should be reduced to show how much free
space remains. Return 0 on success or <0 if not
enough room or other problem.
int cache_parse(struct cache_detail *cd, char *buf, int len)
A message from user space has arrived to fill out a
cache entry. It is in 'buf' of length 'len'.
cache_parse should parse this, find the item in the
cache with sunrpc_cache_lookup, and update the item
with sunrpc_cache_update.
3/ A cache needs to be registered using cache_register(). This
includes it on a list of caches that will be regularly
cleaned to discard old data.
Using a cache
-------------
To find a value in a cache, call the lookup function passing it a the
datum which contains key, and possibly content, and a flag saying
whether to update the cache with new data from the datum. Depending
on how the cache lookup function was defined, it may take an extra
argument to identify the particular cache in question.
To find a value in a cache, call sunrpc_cache_lookup passing a pointer
to the cache_head in a sample item with the 'key' fields filled in.
This will be passed to ->match to identify the target entry. If no
entry is found, a new entry will be create, added to the cache, and
marked as not containing valid data.
Except in cases of kmalloc failure, the lookup function
will return a new datum which will store the key and
may contain valid content, or may not.
This datum is typically passed to cache_check which determines the
validity of the datum and may later initiate an upcall to fill
in the data.
The item returned is typically passed to cache_check which will check
if the data is valid, and may initiate an up-call to get fresh data.
cache_check will return -ENOENT in the entry is negative or if an up
call is needed but not possible, -EAGAIN if an upcall is pending,
or 0 if the data is valid;
cache_check can be passed a "struct cache_req *". This structure is
typically embedded in the actual request and can be used to create a
......@@ -90,6 +116,13 @@ item does become valid, the deferred copy of the request will be
revisited (->revisit). It is expected that this method will
reschedule the request for processing.
The value returned by sunrpc_cache_lookup can also be passed to
sunrpc_cache_update to set the content for the item. A second item is
passed which should hold the content. If the item found by _lookup
has valid data, then it is discarded and a new item is created. This
saves any user of an item from worrying about content changing while
it is being inspected. If the item found by _lookup does not contain
valid data, then the content is copied across and CACHE_VALID is set.
Populating a cache
------------------
......@@ -114,8 +147,8 @@ should be create or updated to have the given content, and the
expiry time should be set on that item.
Reading from a channel is a bit more interesting. When a cache
lookup fail, or when it suceeds but finds an entry that may soon
expiry, a request is lodged for that cache item to be updated by
lookup fails, or when it succeeds but finds an entry that may soon
expire, a request is lodged for that cache item to be updated by
user-space. These requests appear in the channel file.
Successive reads will return successive requests.
......@@ -130,7 +163,7 @@ Thus a user-space helper is likely to:
write a response
loop.
If it dies and needs to be restarted, any requests that have not be
If it dies and needs to be restarted, any requests that have not been
answered will still appear in the file and will be read by the new
instance of the helper.
......@@ -142,10 +175,9 @@ Each cache should also define a "cache_request" method which
takes a cache item and encodes a request into the buffer
provided.
Note: If a cache has no active readers on the channel, and has had not
active readers for more than 60 seconds, further requests will not be
added to the channel but instead all looks that do not find a valid
added to the channel but instead all lookups that do not find a valid
entry will fail. This is partly for backward compatibility: The
previous nfs exports table was deemed to be authoritative and a
failed lookup meant a definite 'no'.
......@@ -154,18 +186,17 @@ request/response format
-----------------------
While each cache is free to use it's own format for requests
and responses over channel, the following is recommended are
and responses over channel, the following is recommended as
appropriate and support routines are available to help:
Each request or response record should be printable ASCII
with precisely one newline character which should be at the end.
Fields within the record should be separated by spaces, normally one.
If spaces, newlines, or nul characters are needed in a field they
much be quotes. two mechanisms are available:
much be quoted. two mechanisms are available:
1/ If a field begins '\x' then it must contain an even number of
hex digits, and pairs of these digits provide the bytes in the
field.
2/ otherwise a \ in the field must be followed by 3 octal digits
which give the code for a byte. Other characters are treated
as them selves. At the very least, space, newlines nul, and
as them selves. At the very least, space, newline, nul, and
'\' must be quoted in this way.
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment