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authorDavid Howells <dhowells@redhat.com>2017-11-02 16:27:50 +0100
committerDavid Howells <dhowells@redhat.com>2017-11-13 16:38:18 +0100
commit989782dcdc91a5e6d5999c7a52a84a60a0811e56 (patch)
tree138ed46554536280e0d4d1834a16c28740e8cdae /fs/afs/super.c
parentafs: Overhaul permit caching (diff)
downloadlinux-989782dcdc91a5e6d5999c7a52a84a60a0811e56.tar.xz
linux-989782dcdc91a5e6d5999c7a52a84a60a0811e56.zip
afs: Overhaul cell database management
Overhaul the way that the in-kernel AFS client keeps track of cells in the following manner: (1) Cells are now held in an rbtree to make walking them quicker and RCU managed (though this is probably overkill). (2) Cells now have a manager work item that: (A) Looks after fetching and refreshing the VL server list. (B) Manages cell record lifetime, including initialising and destruction. (B) Manages cell record caching whereby threads are kept around for a certain time after last use and then destroyed. (C) Manages the FS-Cache index cookie for a cell. It is not permitted for a cookie to be in use twice, so we have to be careful to not allow a new cell record to exist at the same time as an old record of the same name. (3) Each AFS network namespace is given a manager work item that manages the cells within it, maintaining a single timer to prod cells into updating their DNS records. This uses the reduce_timer() facility to make the timer expire at the soonest timed event that needs happening. (4) When a module is being unloaded, cells and cell managers are now counted out using dec_after_work() to make sure the module text is pinned until after the data structures have been cleaned up. (5) Each cell's VL server list is now protected by a seqlock rather than a semaphore. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/super.c')
-rw-r--r--fs/afs/super.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/afs/super.c b/fs/afs/super.c
index e62fb1bdadc6..3d53b78b350d 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -200,10 +200,11 @@ static int afs_parse_options(struct afs_mount_params *params,
token = match_token(p, afs_options_list, args);
switch (token) {
case afs_opt_cell:
- cell = afs_cell_lookup(params->net,
- args[0].from,
- args[0].to - args[0].from,
- false);
+ rcu_read_lock();
+ cell = afs_lookup_cell_rcu(params->net,
+ args[0].from,
+ args[0].to - args[0].from);
+ rcu_read_unlock();
if (IS_ERR(cell))
return PTR_ERR(cell);
afs_put_cell(params->net, params->cell);
@@ -308,7 +309,8 @@ static int afs_parse_device_name(struct afs_mount_params *params,
/* lookup the cell record */
if (cellname || !params->cell) {
- cell = afs_cell_lookup(params->net, cellname, cellnamesz, true);
+ cell = afs_lookup_cell(params->net, cellname, cellnamesz,
+ NULL, false);
if (IS_ERR(cell)) {
printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
cellnamesz, cellnamesz, cellname ?: "");