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NFS client updates for Linux 3.13

Highlights include:
 
 - Changes to the RPC socket code to allow NFSv4 to turn off timeout+retry
   - Detect TCP connection breakage through the "keepalive" mechanism
 - Add client side support for NFSv4.x migration (Chuck Lever)
 - Add support for multiple security flavour arguments to the "sec=" mount
   option (Dros Adamson)
 - fs-cache bugfixes from David Howells:
   - Fix an issue whereby caching can be enabled on a file that is open for
     writing
 - More NFSv4 open code stable bugfixes
 - Various Labeled NFS (selinux) bugfixes, including one stable fix
 - Fix buffer overflow checking in the RPCSEC_GSS upcall encoding
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Merge tag 'nfs-for-3.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Highlights include:

   - Changes to the RPC socket code to allow NFSv4 to turn off
     timeout+retry:
      * Detect TCP connection breakage through the "keepalive" mechanism
   - Add client side support for NFSv4.x migration (Chuck Lever)
   - Add support for multiple security flavour arguments to the "sec="
     mount option (Dros Adamson)
   - fs-cache bugfixes from David Howells:
     * Fix an issue whereby caching can be enabled on a file that is
       open for writing
   - More NFSv4 open code stable bugfixes
   - Various Labeled NFS (selinux) bugfixes, including one stable fix
   - Fix buffer overflow checking in the RPCSEC_GSS upcall encoding"

* tag 'nfs-for-3.13-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (68 commits)
  NFSv4.2: Remove redundant checks in nfs_setsecurity+nfs4_label_init_security
  NFSv4: Sanity check the server reply in _nfs4_server_capabilities
  NFSv4.2: encode_readdir - only ask for labels when doing readdirplus
  nfs: set security label when revalidating inode
  NFSv4.2: Fix a mismatch between Linux labeled NFS and the NFSv4.2 spec
  NFS: Fix a missing initialisation when reading the SELinux label
  nfs: fix oops when trying to set SELinux label
  nfs: fix inverted test for delegation in nfs4_reclaim_open_state
  SUNRPC: Cleanup xs_destroy()
  SUNRPC: close a rare race in xs_tcp_setup_socket.
  SUNRPC: remove duplicated include from clnt.c
  nfs: use IS_ROOT not DCACHE_DISCONNECTED
  SUNRPC: Fix buffer overflow checking in gss_encode_v0_msg/gss_encode_v1_msg
  SUNRPC: gss_alloc_msg - choose _either_ a v0 message or a v1 message
  SUNRPC: remove an unnecessary if statement
  nfs: Use PTR_ERR_OR_ZERO in 'nfs/nfs4super.c'
  nfs: Use PTR_ERR_OR_ZERO in 'nfs41_callback_up' function
  nfs: Remove useless 'error' assignment
  sunrpc: comment typo fix
  SUNRPC: Add correct rcu_dereference annotation in rpc_clnt_set_transport
  ...
master
Linus Torvalds 8 years ago
parent
commit
c224b76b56
  1. 73
      Documentation/filesystems/caching/netfs-api.txt
  2. 6
      fs/9p/cache.c
  3. 2
      fs/afs/cell.c
  4. 2
      fs/afs/inode.c
  5. 3
      fs/afs/vlocation.c
  6. 2
      fs/afs/volume.c
  7. 2
      fs/cachefiles/interface.c
  8. 4
      fs/ceph/cache.c
  9. 8
      fs/cifs/fscache.c
  10. 193
      fs/fscache/cookie.c
  11. 1
      fs/fscache/fsdef.c
  12. 1
      fs/fscache/netfs.c
  13. 7
      fs/fscache/object.c
  14. 59
      fs/fscache/page.c
  15. 11
      fs/nfs/Kconfig
  16. 3
      fs/nfs/callback.c
  17. 10
      fs/nfs/client.c
  18. 10
      fs/nfs/dir.c
  19. 202
      fs/nfs/fscache.c
  20. 18
      fs/nfs/fscache.h
  21. 16
      fs/nfs/inode.c
  22. 8
      fs/nfs/internal.h
  23. 17
      fs/nfs/nfs4_fs.h
  24. 138
      fs/nfs/nfs4client.c
  25. 2
      fs/nfs/nfs4file.c
  26. 118
      fs/nfs/nfs4namespace.c
  27. 470
      fs/nfs/nfs4proc.c
  28. 264
      fs/nfs/nfs4state.c
  29. 12
      fs/nfs/nfs4super.c
  30. 138
      fs/nfs/nfs4xdr.c
  31. 198
      fs/nfs/super.c
  32. 3
      fs/nfs/unlink.c
  33. 5
      include/linux/fs.h
  34. 50
      include/linux/fscache-cache.h
  35. 113
      include/linux/fscache.h
  36. 5
      include/linux/nfs4.h
  37. 8
      include/linux/nfs_fs.h
  38. 10
      include/linux/nfs_fs_sb.h
  39. 24
      include/linux/nfs_xdr.h
  40. 6
      include/linux/sunrpc/clnt.h
  41. 1
      include/linux/sunrpc/sched.h
  42. 2
      include/linux/sunrpc/xprt.h
  43. 2
      include/uapi/linux/nfs_mount.h
  44. 57
      net/sunrpc/auth_gss/auth_gss.c
  45. 148
      net/sunrpc/clnt.c
  46. 63
      net/sunrpc/xprt.c
  47. 47
      net/sunrpc/xprtsock.c

73
Documentation/filesystems/caching/netfs-api.txt

@ -29,15 +29,16 @@ This document contains the following sections:
(6) Index registration
(7) Data file registration
(8) Miscellaneous object registration
(9) Setting the data file size
(9) Setting the data file size
(10) Page alloc/read/write
(11) Page uncaching
(12) Index and data file consistency
(13) Miscellaneous cookie operations
(14) Cookie unregistration
(15) Index invalidation
(16) Data file invalidation
(17) FS-Cache specific page flags.
(13) Cookie enablement
(14) Miscellaneous cookie operations
(15) Cookie unregistration
(16) Index invalidation
(17) Data file invalidation
(18) FS-Cache specific page flags.
=============================
@ -334,7 +335,8 @@ the path to the file:
struct fscache_cookie *
fscache_acquire_cookie(struct fscache_cookie *parent,
const struct fscache_object_def *def,
void *netfs_data);
void *netfs_data,
bool enable);
This function creates an index entry in the index represented by parent,
filling in the index entry by calling the operations pointed to by def.
@ -350,6 +352,10 @@ object needs to be created somewhere down the hierarchy. Furthermore, an index
may be created in several different caches independently at different times.
This is all handled transparently, and the netfs doesn't see any of it.
A cookie will be created in the disabled state if enabled is false. A cookie
must be enabled to do anything with it. A disabled cookie can be enabled by
calling fscache_enable_cookie() (see below).
For example, with AFS, a cell would be added to the primary index. This index
entry would have a dependent inode containing a volume location index for the
volume mappings within this cell:
@ -357,7 +363,7 @@ volume mappings within this cell:
cell->cache =
fscache_acquire_cookie(afs_cache_netfs.primary_index,
&afs_cell_cache_index_def,
cell);
cell, true);
Then when a volume location was accessed, it would be entered into the cell's
index and an inode would be allocated that acts as a volume type and hash chain
@ -366,7 +372,7 @@ combination:
vlocation->cache =
fscache_acquire_cookie(cell->cache,
&afs_vlocation_cache_index_def,
vlocation);
vlocation, true);
And then a particular flavour of volume (R/O for example) could be added to
that index, creating another index for vnodes (AFS inode equivalents):
@ -374,7 +380,7 @@ that index, creating another index for vnodes (AFS inode equivalents):
volume->cache =
fscache_acquire_cookie(vlocation->cache,
&afs_volume_cache_index_def,
volume);
volume, true);
======================
@ -388,7 +394,7 @@ the object definition should be something other than index type.
vnode->cache =
fscache_acquire_cookie(volume->cache,
&afs_vnode_cache_object_def,
vnode);
vnode, true);
=================================
@ -404,7 +410,7 @@ it would be some other type of object such as a data file.
xattr->cache =
fscache_acquire_cookie(vnode->cache,
&afs_xattr_cache_object_def,
xattr);
xattr, true);
Miscellaneous objects might be used to store extended attributes or directory
entries for example.
@ -733,6 +739,47 @@ Note that partial updates may happen automatically at other times, such as when
data blocks are added to a data file object.
=================
COOKIE ENABLEMENT
=================
Cookies exist in one of two states: enabled and disabled. If a cookie is
disabled, it ignores all attempts to acquire child cookies; check, update or
invalidate its state; allocate, read or write backing pages - though it is
still possible to uncache pages and relinquish the cookie.
The initial enablement state is set by fscache_acquire_cookie(), but the cookie
can be enabled or disabled later. To disable a cookie, call:
void fscache_disable_cookie(struct fscache_cookie *cookie,
bool invalidate);
If the cookie is not already disabled, this locks the cookie against other
enable and disable ops, marks the cookie as being disabled, discards or
invalidates any backing objects and waits for cessation of activity on any
associated object before unlocking the cookie.
All possible failures are handled internally. The caller should consider
calling fscache_uncache_all_inode_pages() afterwards to make sure all page
markings are cleared up.
Cookies can be enabled or reenabled with:
void fscache_enable_cookie(struct fscache_cookie *cookie,
bool (*can_enable)(void *data),
void *data)
If the cookie is not already enabled, this locks the cookie against other
enable and disable ops, invokes can_enable() and, if the cookie is not an index
cookie, will begin the procedure of acquiring backing objects.
The optional can_enable() function is passed the data argument and returns a
ruling as to whether or not enablement should actually be permitted to begin.
All possible failures are handled internally. The cookie will only be marked
as enabled if provisional backing objects are allocated.
===============================
MISCELLANEOUS COOKIE OPERATIONS
===============================
@ -778,7 +825,7 @@ COOKIE UNREGISTRATION
To get rid of a cookie, this function should be called.
void fscache_relinquish_cookie(struct fscache_cookie *cookie,
int retire);
bool retire);
If retire is non-zero, then the object will be marked for recycling, and all
copies of it will be removed from all active caches in which it is present.

6
fs/9p/cache.c

@ -90,7 +90,7 @@ void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
v9ses->fscache = fscache_acquire_cookie(v9fs_cache_netfs.primary_index,
&v9fs_cache_session_index_def,
v9ses);
v9ses, true);
p9_debug(P9_DEBUG_FSC, "session %p get cookie %p\n",
v9ses, v9ses->fscache);
}
@ -204,7 +204,7 @@ void v9fs_cache_inode_get_cookie(struct inode *inode)
v9ses = v9fs_inode2v9ses(inode);
v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
&v9fs_cache_inode_index_def,
v9inode);
v9inode, true);
p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n",
inode, v9inode->fscache);
@ -271,7 +271,7 @@ void v9fs_cache_inode_reset_cookie(struct inode *inode)
v9ses = v9fs_inode2v9ses(inode);
v9inode->fscache = fscache_acquire_cookie(v9ses->fscache,
&v9fs_cache_inode_index_def,
v9inode);
v9inode, true);
p9_debug(P9_DEBUG_FSC, "inode %p revalidating cookie old %p new %p\n",
inode, old, v9inode->fscache);

2
fs/afs/cell.c

@ -179,7 +179,7 @@ struct afs_cell *afs_cell_create(const char *name, unsigned namesz,
/* put it up for caching (this never returns an error) */
cell->cache = fscache_acquire_cookie(afs_cache_netfs.primary_index,
&afs_cell_cache_index_def,
cell);
cell, true);
#endif
/* add to the cell lists */

2
fs/afs/inode.c

@ -259,7 +259,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
#ifdef CONFIG_AFS_FSCACHE
vnode->cache = fscache_acquire_cookie(vnode->volume->cache,
&afs_vnode_cache_index_def,
vnode);
vnode, true);
#endif
ret = afs_inode_map_status(vnode, key);

3
fs/afs/vlocation.c

@ -308,7 +308,8 @@ static int afs_vlocation_fill_in_record(struct afs_vlocation *vl,
/* see if we have an in-cache copy (will set vl->valid if there is) */
#ifdef CONFIG_AFS_FSCACHE
vl->cache = fscache_acquire_cookie(vl->cell->cache,
&afs_vlocation_cache_index_def, vl);
&afs_vlocation_cache_index_def, vl,
true);
#endif
if (vl->valid) {

2
fs/afs/volume.c

@ -131,7 +131,7 @@ struct afs_volume *afs_volume_lookup(struct afs_mount_params *params)
#ifdef CONFIG_AFS_FSCACHE
volume->cache = fscache_acquire_cookie(vlocation->cache,
&afs_volume_cache_index_def,
volume);
volume, true);
#endif
afs_get_vlocation(vlocation);
volume->vlocation = vlocation;

2
fs/cachefiles/interface.c

@ -270,7 +270,7 @@ static void cachefiles_drop_object(struct fscache_object *_object)
#endif
/* delete retired objects */
if (test_bit(FSCACHE_COOKIE_RETIRED, &object->fscache.cookie->flags) &&
if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
_object != cache->cache.fsdef
) {
_debug("- retire object OBJ%x", object->fscache.debug_id);

4
fs/ceph/cache.c

@ -68,7 +68,7 @@ int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
{
fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
&ceph_fscache_fsid_object_def,
fsc);
fsc, true);
if (fsc->fscache == NULL) {
pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
@ -204,7 +204,7 @@ void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc,
ci->fscache = fscache_acquire_cookie(fsc->fscache,
&ceph_fscache_inode_object_def,
ci);
ci, true);
done:
mutex_unlock(&inode->i_mutex);

8
fs/cifs/fscache.c

@ -27,7 +27,7 @@ void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server)
{
server->fscache =
fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
&cifs_fscache_server_index_def, server);
&cifs_fscache_server_index_def, server, true);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, server, server->fscache);
}
@ -46,7 +46,7 @@ void cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
tcon->fscache =
fscache_acquire_cookie(server->fscache,
&cifs_fscache_super_index_def, tcon);
&cifs_fscache_super_index_def, tcon, true);
cifs_dbg(FYI, "%s: (0x%p/0x%p)\n",
__func__, server->fscache, tcon->fscache);
}
@ -69,7 +69,7 @@ static void cifs_fscache_enable_inode_cookie(struct inode *inode)
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) {
cifsi->fscache = fscache_acquire_cookie(tcon->fscache,
&cifs_fscache_inode_object_def, cifsi);
&cifs_fscache_inode_object_def, cifsi, true);
cifs_dbg(FYI, "%s: got FH cookie (0x%p/0x%p)\n",
__func__, tcon->fscache, cifsi->fscache);
}
@ -119,7 +119,7 @@ void cifs_fscache_reset_inode_cookie(struct inode *inode)
cifsi->fscache = fscache_acquire_cookie(
cifs_sb_master_tcon(cifs_sb)->fscache,
&cifs_fscache_inode_object_def,
cifsi);
cifsi, true);
cifs_dbg(FYI, "%s: new cookie 0x%p oldcookie 0x%p\n",
__func__, cifsi->fscache, old);
}

193
fs/fscache/cookie.c

@ -58,15 +58,16 @@ void fscache_cookie_init_once(void *_cookie)
struct fscache_cookie *__fscache_acquire_cookie(
struct fscache_cookie *parent,
const struct fscache_cookie_def *def,
void *netfs_data)
void *netfs_data,
bool enable)
{
struct fscache_cookie *cookie;
BUG_ON(!def);
_enter("{%s},{%s},%p",
_enter("{%s},{%s},%p,%u",
parent ? (char *) parent->def->name : "<no-parent>",
def->name, netfs_data);
def->name, netfs_data, enable);
fscache_stat(&fscache_n_acquires);
@ -106,7 +107,7 @@ struct fscache_cookie *__fscache_acquire_cookie(
cookie->def = def;
cookie->parent = parent;
cookie->netfs_data = netfs_data;
cookie->flags = 0;
cookie->flags = (1 << FSCACHE_COOKIE_NO_DATA_YET);
/* radix tree insertion won't use the preallocation pool unless it's
* told it may not wait */
@ -124,16 +125,22 @@ struct fscache_cookie *__fscache_acquire_cookie(
break;
}
/* if the object is an index then we need do nothing more here - we
* create indices on disk when we need them as an index may exist in
* multiple caches */
if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
if (fscache_acquire_non_index_cookie(cookie) < 0) {
atomic_dec(&parent->n_children);
__fscache_cookie_put(cookie);
fscache_stat(&fscache_n_acquires_nobufs);
_leave(" = NULL");
return NULL;
if (enable) {
/* if the object is an index then we need do nothing more here
* - we create indices on disk when we need them as an index
* may exist in multiple caches */
if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
if (fscache_acquire_non_index_cookie(cookie) == 0) {
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
} else {
atomic_dec(&parent->n_children);
__fscache_cookie_put(cookie);
fscache_stat(&fscache_n_acquires_nobufs);
_leave(" = NULL");
return NULL;
}
} else {
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
}
}
@ -143,6 +150,39 @@ struct fscache_cookie *__fscache_acquire_cookie(
}
EXPORT_SYMBOL(__fscache_acquire_cookie);
/*
* Enable a cookie to permit it to accept new operations.
*/
void __fscache_enable_cookie(struct fscache_cookie *cookie,
bool (*can_enable)(void *data),
void *data)
{
_enter("%p", cookie);
wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
fscache_wait_bit, TASK_UNINTERRUPTIBLE);
if (test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
goto out_unlock;
if (can_enable && !can_enable(data)) {
/* The netfs decided it didn't want to enable after all */
} else if (cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX) {
/* Wait for outstanding disablement to complete */
__fscache_wait_on_invalidate(cookie);
if (fscache_acquire_non_index_cookie(cookie) == 0)
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
} else {
set_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
}
out_unlock:
clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
}
EXPORT_SYMBOL(__fscache_enable_cookie);
/*
* acquire a non-index cookie
* - this must make sure the index chain is instantiated and instantiate the
@ -157,7 +197,7 @@ static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie)
_enter("");
cookie->flags = 1 << FSCACHE_COOKIE_UNAVAILABLE;
set_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
/* now we need to see whether the backing objects for this cookie yet
* exist, if not there'll be nothing to search */
@ -180,9 +220,7 @@ static int fscache_acquire_non_index_cookie(struct fscache_cookie *cookie)
_debug("cache %s", cache->tag->name);
cookie->flags =
(1 << FSCACHE_COOKIE_LOOKING_UP) |
(1 << FSCACHE_COOKIE_NO_DATA_YET);
set_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
/* ask the cache to allocate objects for this cookie and its parent
* chain */
@ -398,7 +436,8 @@ void __fscache_invalidate(struct fscache_cookie *cookie)
if (!hlist_empty(&cookie->backing_objects)) {
spin_lock(&cookie->lock);
if (!hlist_empty(&cookie->backing_objects) &&
if (fscache_cookie_enabled(cookie) &&
!hlist_empty(&cookie->backing_objects) &&
!test_and_set_bit(FSCACHE_COOKIE_INVALIDATING,
&cookie->flags)) {
object = hlist_entry(cookie->backing_objects.first,
@ -452,10 +491,14 @@ void __fscache_update_cookie(struct fscache_cookie *cookie)
spin_lock(&cookie->lock);
/* update the index entry on disk in each cache backing this cookie */
hlist_for_each_entry(object,
&cookie->backing_objects, cookie_link) {
fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
if (fscache_cookie_enabled(cookie)) {
/* update the index entry on disk in each cache backing this
* cookie.
*/
hlist_for_each_entry(object,
&cookie->backing_objects, cookie_link) {
fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
}
}
spin_unlock(&cookie->lock);
@ -464,28 +507,14 @@ void __fscache_update_cookie(struct fscache_cookie *cookie)
EXPORT_SYMBOL(__fscache_update_cookie);
/*
* release a cookie back to the cache
* - the object will be marked as recyclable on disk if retire is true
* - all dependents of this cookie must have already been unregistered
* (indices/files/pages)
* Disable a cookie to stop it from accepting new requests from the netfs.
*/
void __fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
void __fscache_disable_cookie(struct fscache_cookie *cookie, bool invalidate)
{
struct fscache_object *object;
bool awaken = false;
fscache_stat(&fscache_n_relinquishes);
if (retire)
fscache_stat(&fscache_n_relinquishes_retire);
if (!cookie) {
fscache_stat(&fscache_n_relinquishes_null);
_leave(" [no cookie]");
return;
}
_enter("%p{%s,%p,%d},%d",
cookie, cookie->def->name, cookie->netfs_data,
atomic_read(&cookie->n_active), retire);
_enter("%p,%u", cookie, invalidate);
ASSERTCMP(atomic_read(&cookie->n_active), >, 0);
@ -495,24 +524,82 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire)
BUG();
}
/* No further netfs-accessing operations on this cookie permitted */
set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags);
if (retire)
set_bit(FSCACHE_COOKIE_RETIRED, &cookie->flags);
wait_on_bit_lock(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK,
fscache_wait_bit, TASK_UNINTERRUPTIBLE);
if (!test_and_clear_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags))
goto out_unlock_enable;
/* If the cookie is being invalidated, wait for that to complete first
* so that we can reuse the flag.
*/
__fscache_wait_on_invalidate(cookie);
/* Dispose of the backing objects */
set_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags);
spin_lock(&cookie->lock);
hlist_for_each_entry(object, &cookie->backing_objects, cookie_link) {
fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
if (!hlist_empty(&cookie->backing_objects)) {
hlist_for_each_entry(object, &cookie->backing_objects, cookie_link) {
if (invalidate)
set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
fscache_raise_event(object, FSCACHE_OBJECT_EV_KILL);
}
} else {
if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
awaken = true;
}
spin_unlock(&cookie->lock);
if (awaken)
wake_up_bit(&cookie->flags, FSCACHE_COOKIE_INVALIDATING);
/* Wait for cessation of activity requiring access to the netfs (when
* n_active reaches 0).
* n_active reaches 0). This makes sure outstanding reads and writes
* have completed.
*/
if (!atomic_dec_and_test(&cookie->n_active))
wait_on_atomic_t(&cookie->n_active, fscache_wait_atomic_t,
TASK_UNINTERRUPTIBLE);
/* Reset the cookie state if it wasn't relinquished */
if (!test_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags)) {
atomic_inc(&cookie->n_active);
set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
}
out_unlock_enable:
clear_bit_unlock(FSCACHE_COOKIE_ENABLEMENT_LOCK, &cookie->flags);
wake_up_bit(&cookie->flags, FSCACHE_COOKIE_ENABLEMENT_LOCK);
_leave("");
}
EXPORT_SYMBOL(__fscache_disable_cookie);
/*
* release a cookie back to the cache
* - the object will be marked as recyclable on disk if retire is true
* - all dependents of this cookie must have already been unregistered
* (indices/files/pages)
*/
void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
{
fscache_stat(&fscache_n_relinquishes);
if (retire)
fscache_stat(&fscache_n_relinquishes_retire);
if (!cookie) {
fscache_stat(&fscache_n_relinquishes_null);
_leave(" [no cookie]");
return;
}
_enter("%p{%s,%p,%d},%d",
cookie, cookie->def->name, cookie->netfs_data,
atomic_read(&cookie->n_active), retire);
/* No further netfs-accessing operations on this cookie permitted */
set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags);
__fscache_disable_cookie(cookie, retire);
/* Clear pointers back to the netfs */
cookie->netfs_data = NULL;
cookie->def = NULL;
@ -568,6 +655,7 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
{
struct fscache_operation *op;
struct fscache_object *object;
bool wake_cookie = false;
int ret;
_enter("%p,", cookie);
@ -591,7 +679,8 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto inconsistent;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
@ -600,7 +689,7 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
op->debug_id = atomic_inc_return(&fscache_op_debug_id);
atomic_inc(&cookie->n_active);
__fscache_use_cookie(cookie);
if (fscache_submit_op(object, op) < 0)
goto submit_failed;
@ -622,9 +711,11 @@ int __fscache_check_consistency(struct fscache_cookie *cookie)
return ret;
submit_failed:
atomic_dec(&cookie->n_active);
wake_cookie = __fscache_unuse_cookie(cookie);
inconsistent:
spin_unlock(&cookie->lock);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
kfree(op);
_leave(" = -ESTALE");
return -ESTALE;

1
fs/fscache/fsdef.c

@ -59,6 +59,7 @@ struct fscache_cookie fscache_fsdef_index = {
.lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
.backing_objects = HLIST_HEAD_INIT,
.def = &fscache_fsdef_index_def,
.flags = 1 << FSCACHE_COOKIE_ENABLED,
};
EXPORT_SYMBOL(fscache_fsdef_index);

1
fs/fscache/netfs.c

@ -45,6 +45,7 @@ int __fscache_register_netfs(struct fscache_netfs *netfs)
netfs->primary_index->def = &fscache_fsdef_netfs_def;
netfs->primary_index->parent = &fscache_fsdef_index;
netfs->primary_index->netfs_data = netfs;
netfs->primary_index->flags = 1 << FSCACHE_COOKIE_ENABLED;
atomic_inc(&netfs->primary_index->parent->usage);
atomic_inc(&netfs->primary_index->parent->n_children);

7
fs/fscache/object.c

@ -495,6 +495,7 @@ void fscache_object_lookup_negative(struct fscache_object *object)
* returning ENODATA.
*/
set_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
_debug("wake up lookup %p", &cookie->flags);
clear_bit_unlock(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags);
@ -527,6 +528,7 @@ void fscache_obtained_object(struct fscache_object *object)
/* We do (presumably) have data */
clear_bit_unlock(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags);
clear_bit(FSCACHE_COOKIE_UNAVAILABLE, &cookie->flags);
/* Allow write requests to begin stacking up and read requests
* to begin shovelling data.
@ -679,7 +681,8 @@ static const struct fscache_state *fscache_drop_object(struct fscache_object *ob
*/
spin_lock(&cookie->lock);
hlist_del_init(&object->cookie_link);
if (test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
if (hlist_empty(&cookie->backing_objects) &&
test_and_clear_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags))
awaken = true;
spin_unlock(&cookie->lock);
@ -927,7 +930,7 @@ static const struct fscache_state *_fscache_invalidate_object(struct fscache_obj
*/
if (!fscache_use_cookie(object)) {
ASSERT(object->cookie->stores.rnode == NULL);
set_bit(FSCACHE_COOKIE_RETIRED, &cookie->flags);
set_bit(FSCACHE_OBJECT_RETIRED, &object->flags);
_leave(" [no cookie]");
return transit_to(KILL_OBJECT);
}

59
fs/fscache/page.c

@ -163,12 +163,10 @@ static void fscache_attr_changed_op(struct fscache_operation *op)
fscache_stat(&fscache_n_attr_changed_calls);
if (fscache_object_is_active(object) &&
fscache_use_cookie(object)) {
if (fscache_object_is_active(object)) {
fscache_stat(&fscache_n_cop_attr_changed);
ret = object->cache->ops->attr_changed(object);
fscache_stat_d(&fscache_n_cop_attr_changed);
fscache_unuse_cookie(object);
if (ret < 0)
fscache_abort_object(object);
}
@ -184,6 +182,7 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
{
struct fscache_operation *op;
struct fscache_object *object;
bool wake_cookie;
_enter("%p", cookie);
@ -199,15 +198,19 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
}
fscache_operation_init(op, fscache_attr_changed_op, NULL);
op->flags = FSCACHE_OP_ASYNC | (1 << FSCACHE_OP_EXCLUSIVE);
op->flags = FSCACHE_OP_ASYNC |
(1 << FSCACHE_OP_EXCLUSIVE) |
(1 << FSCACHE_OP_UNUSE_COOKIE);
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto nobufs;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
__fscache_use_cookie(cookie);
if (fscache_submit_exclusive_op(object, op) < 0)
goto nobufs;
spin_unlock(&cookie->lock);
@ -217,8 +220,11 @@ int __fscache_attr_changed(struct fscache_cookie *cookie)
return 0;
nobufs:
wake_cookie = __fscache_unuse_cookie(cookie);
spin_unlock(&cookie->lock);
kfree(op);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
fscache_stat(&fscache_n_attr_changed_nobufs);
_leave(" = %d", -ENOBUFS);
return -ENOBUFS;
@ -263,7 +269,6 @@ static struct fscache_retrieval *fscache_alloc_retrieval(
}
fscache_operation_init(&op->op, NULL, fscache_release_retrieval_op);
atomic_inc(&cookie->n_active);
op->op.flags = FSCACHE_OP_MYTHREAD |
(1UL << FSCACHE_OP_WAITING) |
(1UL << FSCACHE_OP_UNUSE_COOKIE);
@ -384,6 +389,7 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
{
struct fscache_retrieval *op;
struct fscache_object *object;
bool wake_cookie = false;
int ret;
_enter("%p,%p,,,", cookie, page);
@ -405,7 +411,7 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
return -ERESTARTSYS;
op = fscache_alloc_retrieval(cookie, page->mapping,
end_io_func,context);
end_io_func, context);
if (!op) {
_leave(" = -ENOMEM");
return -ENOMEM;
@ -414,13 +420,15 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto nobufs_unlock;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
ASSERT(test_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags));
__fscache_use_cookie(cookie);
atomic_inc(&object->n_reads);
__set_bit(FSCACHE_OP_DEC_READ_CNT, &op->op.flags);
@ -475,9 +483,11 @@ error:
nobufs_unlock_dec:
atomic_dec(&object->n_reads);
wake_cookie = __fscache_unuse_cookie(cookie);
nobufs_unlock:
spin_unlock(&cookie->lock);
atomic_dec(&cookie->n_active);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
kfree(op);
nobufs:
fscache_stat(&fscache_n_retrievals_nobufs);
@ -514,6 +524,7 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
{
struct fscache_retrieval *op;
struct fscache_object *object;
bool wake_cookie = false;
int ret;
_enter("%p,,%d,,,", cookie, *nr_pages);
@ -542,11 +553,13 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto nobufs_unlock;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
__fscache_use_cookie(cookie);
atomic_inc(&object->n_reads);
__set_bit(FSCACHE_OP_DEC_READ_CNT, &op->op.flags);
@ -601,10 +614,12 @@ error:
nobufs_unlock_dec:
atomic_dec(&object->n_reads);
wake_cookie = __fscache_unuse_cookie(cookie);
nobufs_unlock:
spin_unlock(&cookie->lock);
atomic_dec(&cookie->n_active);
kfree(op);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
nobufs:
fscache_stat(&fscache_n_retrievals_nobufs);
_leave(" = -ENOBUFS");
@ -626,6 +641,7 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
{
struct fscache_retrieval *op;
struct fscache_object *object;
bool wake_cookie = false;
int ret;
_enter("%p,%p,,,", cookie, page);
@ -653,13 +669,15 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto nobufs_unlock;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
__fscache_use_cookie(cookie);
if (fscache_submit_op(object, &op->op) < 0)
goto nobufs_unlock;
goto nobufs_unlock_dec;
spin_unlock(&cookie->lock);
fscache_stat(&fscache_n_alloc_ops);
@ -689,10 +707,13 @@ error:
_leave(" = %d", ret);
return ret;
nobufs_unlock_dec:
wake_cookie = __fscache_unuse_cookie(cookie);
nobufs_unlock:
spin_unlock(&cookie->lock);
atomic_dec(&cookie->n_active);
kfree(op);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
nobufs:
fscache_stat(&fscache_n_allocs_nobufs);
_leave(" = -ENOBUFS");
@ -889,6 +910,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
{
struct fscache_storage *op;
struct fscache_object *object;
bool wake_cookie = false;
int ret;
_enter("%p,%x,", cookie, (u32) page->flags);
@ -920,7 +942,8 @@ int __fscache_write_page(struct fscache_cookie *cookie,
ret = -ENOBUFS;
spin_lock(&cookie->lock);
if (hlist_empty(&cookie->backing_objects))
if (!fscache_cookie_enabled(cookie) ||
hlist_empty(&cookie->backing_objects))
goto nobufs;
object = hlist_entry(cookie->backing_objects.first,
struct fscache_object, cookie_link);
@ -957,7 +980,7 @@ int __fscache_write_page(struct fscache_cookie *cookie,
op->op.debug_id = atomic_inc_return(&fscache_op_debug_id);
op->store_limit = object->store_limit;
atomic_inc(&cookie->n_active);
__fscache_use_cookie(cookie);
if (fscache_submit_op(object, &op->op) < 0)
goto submit_failed;
@ -984,10 +1007,10 @@ already_pending:
return 0;
submit_failed:
atomic_dec(&cookie->n_active);
spin_lock(&cookie->stores_lock);
radix_tree_delete(&cookie->stores, page->index);
spin_unlock(&cookie->stores_lock);
wake_cookie = __fscache_unuse_cookie(cookie);
page_cache_release(page);
ret = -ENOBUFS;
goto nobufs;
@ -999,6 +1022,8 @@ nobufs:
spin_unlock(&cookie->lock);
radix_tree_preload_end();
kfree(op);
if (wake_cookie)
__fscache_wake_unused_cookie(cookie);
fscache_stat(&fscache_n_stores_nobufs);
_leave(" = -ENOBUFS");
return -ENOBUFS;

11
fs/nfs/Kconfig

@ -140,6 +140,17 @@ config NFS_V4_1_IMPLEMENTATION_ID_DOMAIN
If the NFS client is unchanged from the upstream kernel, this
option should be set to the default "kernel.org".
config NFS_V4_1_MIGRATION
bool "NFSv4.1 client support for migration"
depends on NFS_V4_1
default n
help
This option makes the NFS client advertise to NFSv4.1 servers that
it can support NFSv4 migration.
The NFSv4.1 pieces of the Linux NFSv4 migration implementation are
still experimental. If you are not an NFSv4 developer, say N here.
config NFS_V4_SECURITY_LABEL
bool
depends on NFS_V4_2 && SECURITY

3
fs/nfs/callback.c

@ -164,8 +164,7 @@ nfs41_callback_up(struct svc_serv *serv)
svc_xprt_put(serv->sv_bc_xprt);
serv->sv_bc_xprt = NULL;
}
dprintk("--> %s return %ld\n", __func__,
IS_ERR(rqstp) ? PTR_ERR(rqstp) : 0);
dprintk("--> %s return %d\n", __func__, PTR_ERR_OR_ZERO(rqstp));
return rqstp;
}

10
fs/nfs/client.c

@ -590,6 +590,8 @@ int nfs_create_rpc_client(struct nfs_client *clp,
if (test_bit(NFS_CS_DISCRTRY, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_DISCRTRY;
if (test_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT;
if (test_bit(NFS_CS_NORESVPORT, &clp->cl_flags))
args.flags |= RPC_CLNT_CREATE_NONPRIVPORT;
if (test_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags))
@ -784,8 +786,10 @@ static int nfs_init_server(struct nfs_server *server,
goto error;
server->port = data->nfs_server.port;
server->auth_info = data->auth_info;
error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]);
error = nfs_init_server_rpcclient(server, &timeparms,
data->selected_flavor);
if (error < 0)
goto error;
@ -926,6 +930,7 @@ void nfs_server_copy_userdata(struct nfs_server *target, struct nfs_server *sour
target->acdirmax = source->acdirmax;
target->caps = source->caps;
target->options = source->options;
target->auth_info = source->auth_info;
}
EXPORT_SYMBOL_GPL(nfs_server_copy_userdata);
@ -943,7 +948,7 @@ void nfs_server_insert_lists(struct nfs_server *server)
}
EXPORT_SYMBOL_GPL(nfs_server_insert_lists);
static void nfs_server_remove_lists(struct nfs_server *server)
void nfs_server_remove_lists(struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs_net *nn;
@ -960,6 +965,7 @@ static void nfs_server_remove_lists(struct nfs_server *server)
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
/*
* Allocate and initialise a server record

10
fs/nfs/dir.c

@ -1139,7 +1139,13 @@ out_zap_parent:
if (inode && S_ISDIR(inode->i_mode)) {
/* Purge readdir caches. */
nfs_zap_caches(inode);
if (dentry->d_flags & DCACHE_DISCONNECTED)
/*
* We can't d_drop the root of a disconnected tree:
* its d_hash is on the s_anon list and d_drop() would hide
* it from shrink_dcache_for_unmount(), leading to busy
* inodes on unmount and further oopses.
*/
if (IS_ROOT(dentry))
goto out_valid;
}
/* If we have submounts, don't unhash ! */
@ -1381,7 +1387,7 @@ static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, i
static int do_open(struct inode *inode, struct file *filp)
{
nfs_fscache_set_inode_cookie(inode, filp);
nfs_fscache_open_file(inode, filp);
return 0;
}

202
fs/nfs/fscache.c

@ -39,7 +39,7 @@ void nfs_fscache_get_client_cookie(struct nfs_client *clp)
/* create a cache index for looking up filehandles */
clp->fscache = fscache_acquire_cookie(nfs_fscache_netfs.primary_index,
&nfs_fscache_server_index_def,
clp);
clp, true);
dfprintk(FSCACHE, "NFS: get client cookie (0x%p/0x%p)\n",
clp, clp->fscache);
}
@ -139,7 +139,7 @@ void nfs_fscache_get_super_cookie(struct super_block *sb, const char *uniq, int
/* create a cache index for looking up filehandles */
nfss->fscache = fscache_acquire_cookie(nfss->nfs_client->fscache,
&nfs_fscache_super_index_def,
nfss);
nfss, true);
dfprintk(FSCACHE, "NFS: get superblock cookie (0x%p/0x%p)\n",
nfss, nfss->fscache);
return;
@ -178,163 +178,79 @@ void nfs_fscache_release_super_cookie(struct super_block *sb)
/*
* Initialise the per-inode cache cookie pointer for an NFS inode.
*/
void nfs_fscache_init_inode_cookie(struct inode *inode)
void nfs_fscache_init_inode(struct inode *inode)
{
NFS_I(inode)->fscache = NULL;
if (S_ISREG(inode->i_mode))
set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
}
/*
* Get the per-inode cache cookie for an NFS inode.
*/
static void nfs_fscache_enable_inode_cookie(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
struct nfs_inode *nfsi = NFS_I(inode);
if (nfsi->fscache || !NFS_FSCACHE(inode))
nfsi->fscache = NULL;
if (!S_ISREG(inode->i_mode))
return;
if ((NFS_SB(sb)->options & NFS_OPTION_FSCACHE)) {
nfsi->fscache = fscache_acquire_cookie(
NFS_SB(sb)->fscache,
&nfs_fscache_inode_object_def,
nfsi);
dfprintk(FSCACHE, "NFS: get FH cookie (0x%p/0x%p/0x%p)\n",
sb, nfsi, nfsi->fscache);
}
nfsi->fscache = fscache_acquire_cookie(NFS_SB(inode->i_sb)->fscache,
&nfs_fscache_inode_object_def,
nfsi, false);
}
/*
* Release a per-inode cookie.
*/
void nfs_fscache_release_inode_cookie(struct inode *inode)
void nfs_fscache_clear_inode(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct fscache_cookie *cookie = nfs_i_fscache(inode);
dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n",
nfsi, nfsi->fscache);
dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n", nfsi, cookie);
fscache_relinquish_cookie(nfsi->fscache, 0);
fscache_relinquish_cookie(cookie, false);
nfsi->fscache = NULL;
}
/*
* Retire a per-inode cookie, destroying the data attached to it.
*/
void nfs_fscache_zap_inode_cookie(struct inode *inode)
static bool nfs_fscache_can_enable(void *data)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct inode *inode = data;
dfprintk(FSCACHE, "NFS: zapping cookie (0x%p/0x%p)\n",
nfsi, nfsi->fscache);
fscache_relinquish_cookie(nfsi->fscache, 1);
nfsi->fscache = NULL;
return !inode_is_open_for_write(inode);
}
/*
* Turn off the cache with regard to a per-inode cookie if opened for writing,
* invalidating all the pages in the page cache relating to the associated
* inode to clear the per-page caching.
*/
static void nfs_fscache_disable_inode_cookie(struct inode *inode)
{
clear_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
if (NFS_I(inode)->fscache) {
dfprintk(FSCACHE,
"NFS: nfsi 0x%p turning cache off\n", NFS_I(inode));
/* Need to uncache any pages attached to this inode that
* fscache knows about before turning off the cache.
*/
fscache_uncache_all_inode_pages(NFS_I(inode)->fscache, inode);
nfs_fscache_zap_inode_cookie(inode);
}
}
/*
* wait_on_bit() sleep function for uninterruptible waiting
*/
static int nfs_fscache_wait_bit(void *flags)
{
schedule();
return 0;
}
/*
* Lock against someone else trying to also acquire or relinquish a cookie
*/
static inline void nfs_fscache_inode_lock(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
while (test_and_set_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags))
wait_on_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK,
nfs_fscache_wait_bit, TASK_UNINTERRUPTIBLE);
}
/*
* Unlock cookie management lock
*/
static inline void nfs_fscache_inode_unlock(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
smp_mb__before_clear_bit();
clear_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags);
smp_mb__after_clear_bit();
wake_up_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK);
}
/*
* Decide if we should enable or disable local caching for this inode.
* - For now, with NFS, only regular files that are open read-only will be able
* to use the cache.
* - May be invoked multiple times in parallel by parallel nfs_open() functions.
*/
void nfs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
{
if (NFS_FSCACHE(inode)) {
nfs_fscache_inode_lock(inode);
if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
nfs_fscache_disable_inode_cookie(inode);
else
nfs_fscache_enable_inode_cookie(inode);
nfs_fscache_inode_unlock(inode);
}
}
EXPORT_SYMBOL_GPL(nfs_fscache_set_inode_cookie);
/*
* Replace a per-inode cookie due to revalidation detecting a file having
* changed on the server.
* Enable or disable caching for a file that is being opened as appropriate.
* The cookie is allocated when the inode is initialised, but is not enabled at
* that time. Enablement is deferred to file-open time to avoid stat() and
* access() thrashing the cache.
*
* For now, with NFS, only regular files that are open read-only will be able
* to use the cache.
*
* We enable the cache for an inode if we open it read-only and it isn't
* currently open for writing. We disable the cache if the inode is open
* write-only.
*
* The caller uses the file struct to pin i_writecount on the inode before
* calling us when a file is opened for writing, so we can make use of that.
*
* Note that this may be invoked multiple times in parallel by parallel
* nfs_open() functions.
*/
void nfs_fscache_reset_inode_cookie(struct inode *inode)
void nfs_fscache_open_file(struct inode *inode, struct file *filp)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_server *nfss = NFS_SERVER(inode);
NFS_IFDEBUG(struct fscache_cookie *old = nfsi->fscache);
struct fscache_cookie *cookie = nfs_i_fscache(inode);
nfs_fscache_inode_lock(inode);
if (nfsi->fscache) {
/* retire the current fscache cache and get a new one */
fscache_relinquish_cookie(nfsi->fscache, 1);
nfsi->fscache = fscache_acquire_cookie(
nfss->nfs_client->fscache,
&nfs_fscache_inode_object_def,
nfsi);
if (!fscache_cookie_valid(cookie))
return;
dfprintk(FSCACHE,
"NFS: revalidation new cookie (0x%p/0x%p/0x%p/0x%p)\n",
nfss, nfsi, old, nfsi->fscache);
if (inode_is_open_for_write(inode)) {
dfprintk(FSCACHE, "NFS: nfsi 0x%p disabling cache\n", nfsi);
clear_bit(NFS_INO_FSCACHE, &nfsi->flags);
fscache_disable_cookie(cookie, true);
fscache_uncache_all_inode_pages(cookie, inode);
} else {
dfprintk(FSCACHE, "NFS: nfsi 0x%p enabling cache\n", nfsi);
fscache_enable_cookie(cookie, nfs_fscache_can_enable, inode);
if (fscache_cookie_enabled(cookie))
set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
}
nfs_fscache_inode_unlock(inode);
}
EXPORT_SYMBOL_GPL(nfs_fscache_open_file);
/*
* Release the caching state associated with a page, if the page isn't busy
@ -344,12 +260,11 @@ void nfs_fscache_reset_inode_cookie(struct inode *inode)
int nfs_fscache_release_page(struct page *page, gfp_t gfp)
{
if (PageFsCache(page)) {
struct nfs_inode *nfsi = NFS_I(page->mapping->host);
struct fscache_cookie *cookie = nfsi->fscache;
struct fscache_cookie *cookie = nfs_i_fscache(page->mapping->host);
BUG_ON(!cookie);
dfprintk(FSCACHE, "NFS: fscache releasepage (0x%p/0x%p/0x%p)\n",
cookie, page, nfsi);
cookie, page, NFS_I(page->mapping->host));
if (!fscache_maybe_release_page(cookie, page, gfp))
return 0;
@ -367,13 +282,12 @@ int nfs_fscache_release_page(struct page *page, gfp_t gfp)
*/
void __nfs_fscache_invalidate_page(struct page *page, struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct fscache_cookie *cookie = nfsi->fscache;
struct fscache_cookie *cookie = nfs_i_fscache(inode);
BUG_ON(!cookie);
dfprintk(FSCACHE, "NFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
cookie, page, nfsi);
cookie, page, NFS_I(inode));
fscache_wait_on_page_write(cookie, page);
@ -417,9 +331,9 @@ int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
dfprintk(FSCACHE,
"NFS: readpage_from_fscache(fsc:%p/p:%p(i:%lx f:%lx)/0x%p)\n",
NFS_I(inode)->fscache, page, page->index, page->flags, inode);
nfs_i_fscache(inode), page, page->index, page->flags, inode);
ret = fscache_read_or_alloc_page(NFS_I(inode)->fscache,
ret = fscache_read_or_alloc_page(nfs_i_fscache(inode),
page,
nfs_readpage_from_fscache_complete,
ctx,
@ -459,9 +373,9 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
int ret;
dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n",
NFS_I(inode)->fscache, npages, inode);
nfs_i_fscache(inode), npages, inode);
ret = fscache_read_or_alloc_pages(NFS_I(inode)->fscache,
ret = fscache_read_or_alloc_pages(nfs_i_fscache(inode),
mapping, pages, nr_pages,
nfs_readpage_from_fscache_complete,
ctx,
@ -506,15 +420,15 @@ void __nfs_readpage_to_fscache(struct inode *inode, struct page *page, int sync)
dfprintk(FSCACHE,
"NFS: readpage_to_fscache(fsc:%p/p:%p(i:%lx f:%lx)/%d)\n",
NFS_I(inode)->fscache, page, page->index, page->flags, sync);
nfs_i_fscache(inode), page, page->index, page->flags, sync);
ret = fscache_write_page(NFS_I(inode)->fscache, page, GFP_KERNEL);
ret = fscache_write_page(nfs_i_fscache(inode), page, GFP_KERNEL);
dfprintk(FSCACHE,
"NFS: readpage_to_fscache: p:%p(i:%lu f:%lx) ret %d\n",
page, page->index, page->flags, ret);
if (ret != 0) {
fscache_uncache_page(NFS_I(inode)->fscache, page);
fscache_uncache_page(nfs_i_fscache(inode), page);
nfs_add_fscache_stats(inode,
NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL, 1);
nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED, 1);

18
fs/nfs/fscache.h

@ -76,11 +76,9 @@ extern void nfs_fscache_release_client_cookie(struct nfs_client *);
extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
extern void nfs_fscache_release_super_cookie(struct super_block *);
extern void nfs_fscache_init_inode_cookie(struct inode *);
extern void nfs_fscache_release_inode_cookie(struct inode *);
extern void nfs_fscache_zap_inode_cookie(struct inode *);
extern void nfs_fscache_set_inode_cookie(struct inode *, struct file *);
extern void nfs_fscache_reset_inode_cookie(struct inode *);
extern void nfs_fscache_init_inode(struct inode *);
extern void nfs_fscache_clear_inode(struct inode *);
extern void nfs_fscache_open_file(struct inode *, struct file *);
extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);