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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>
This commit is contained in:
David Howells 2018-04-09 21:12:31 +01:00
parent fe342cf77b
commit 17814aef57
2 changed files with 4 additions and 3 deletions
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4
fs/afs/cell.c
View File

@ -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);

3
fs/afs/proc.c
View File

@ -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;