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authorDavid Howells <dhowells@redhat.com>2018-04-09 21:12:31 +0100
committerDavid Howells <dhowells@redhat.com>2018-04-09 21:12:31 +0100
commit17814aef57fc0b80ac2a4a7a639db358b75cb6b9 (patch)
tree9d9a28e5811304439cc3cc9911c124801e8b27a8 /fs
parentfe342cf77bc3c3ba89e8bb1e4eddbe614df4efa4 (diff)
afs: Don't over-increment the cell usage count when pinning it
AFS cells that are added or set as the workstation cell through /proc are pinned against removal by setting the AFS_CELL_FL_NO_GC flag on them and taking a ref. The ref should be only taken if the flag wasn't already set. Fix this by making it conditional. Without this an assertion failure will occur during module removal indicating that the refcount is too elevated. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/afs/cell.c4
-rw-r--r--fs/afs/proc.c3
2 files changed, 4 insertions, 3 deletions
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 69b95faacc5e..721425b98b31 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -334,8 +334,8 @@ int afs_cell_init(struct afs_net *net, const char *rootcell)
return PTR_ERR(new_root);
}
- set_bit(AFS_CELL_FL_NO_GC, &new_root->flags);
- afs_get_cell(new_root);
+ if (!test_and_set_bit(AFS_CELL_FL_NO_GC, &new_root->flags))
+ afs_get_cell(new_root);
/* install the new cell */
write_seqlock(&net->cells_lock);
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 1c95756335b7..2f04d37eeef0 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -284,7 +284,8 @@ static ssize_t afs_proc_cells_write(struct file *file, const char __user *buf,
goto done;
}
- set_bit(AFS_CELL_FL_NO_GC, &cell->flags);
+ if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
+ afs_put_cell(net, cell);
printk("kAFS: Added new cell '%s'\n", name);
} else {
goto inval;