diff options
Diffstat (limited to 'ext2fs/pager.c')
| -rw-r--r-- | ext2fs/pager.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/ext2fs/pager.c b/ext2fs/pager.c index 7d3a8f37..485f69cd 100644 --- a/ext2fs/pager.c +++ b/ext2fs/pager.c @@ -817,8 +817,7 @@ pager_clear_user_data (struct user_pager_info *upi) pthread_spin_lock (&node_to_page_lock); pager = diskfs_node_disknode (upi->node)->pager; - if (pager && pager_get_upi (pager) == upi) - diskfs_node_disknode (upi->node)->pager = 0; + assert (!pager || pager_get_upi (pager) != upi); pthread_spin_unlock (&node_to_page_lock); diskfs_nrele_light (upi->node); @@ -831,8 +830,21 @@ pager_clear_user_data (struct user_pager_info *upi) The pager library creates no weak references itself. If the user doesn't either, then it's OK for this function to do nothing. */ void -pager_dropweak (struct user_pager_info *p __attribute__ ((unused))) +pager_dropweak (struct user_pager_info *upi) { + if (upi->type == FILE_DATA) + { + struct pager *pager; + + pthread_spin_lock (&node_to_page_lock); + pager = diskfs_node_disknode (upi->node)->pager; + if (pager && pager_get_upi (pager) == upi) + { + diskfs_node_disknode (upi->node)->pager = NULL; + ports_port_deref_weak (pager); + } + pthread_spin_unlock (&node_to_page_lock); + } } /* Cached blocks from disk. */ @@ -1298,15 +1310,9 @@ diskfs_get_filemap (struct node *node, vm_prot_t prot) struct pager *pager = diskfs_node_disknode (node)->pager; if (pager) { - /* Because PAGER is not a real reference, - this might be nearly deallocated. If that's so, then - the port right will be null. In that case, clear here - and loop. The deallocation will complete separately. */ right = pager_get_port (pager); - if (right == MACH_PORT_NULL) - diskfs_node_disknode (node)->pager = 0; - else - pager_get_upi (pager)->max_prot |= prot; + assert (MACH_PORT_VALID (right)); + pager_get_upi (pager)->max_prot |= prot; } else { @@ -1327,6 +1333,9 @@ diskfs_get_filemap (struct node *node, vm_prot_t prot) return MACH_PORT_NULL; } + /* A weak reference for being part of the node. */ + ports_port_ref_weak (diskfs_node_disknode (node)->pager); + right = pager_get_port (diskfs_node_disknode (node)->pager); ports_port_deref (diskfs_node_disknode (node)->pager); } |