diff options
| -rw-r--r-- | fs/kernfs/dir.c | 42 | ||||
| -rw-r--r-- | fs/kernfs/file.c | 5 | ||||
| -rw-r--r-- | fs/kernfs/kernfs-internal.h | 2 |
3 files changed, 35 insertions, 14 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index e565ec0..f878e4f 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -121,13 +121,17 @@ static int kernfs_link_sibling(struct kernfs_node *kn) * Locking: * mutex_lock(kernfs_mutex) */ -static void kernfs_unlink_sibling(struct kernfs_node *kn) +static bool kernfs_unlink_sibling(struct kernfs_node *kn) { + if (RB_EMPTY_NODE(&kn->rb)) + return false; + if (kernfs_type(kn) == KERNFS_DIR) kn->parent->dir.subdirs--; rb_erase(&kn->rb, &kn->parent->dir.children); RB_CLEAR_NODE(&kn->rb); + return true; } /** @@ -496,7 +500,6 @@ void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt) acxt->removed = kn->u.removed_list; - kernfs_unmap_bin_file(kn); kernfs_put(kn); } } @@ -854,23 +857,44 @@ static void __kernfs_remove(struct kernfs_addrm_cxt *acxt, /* unlink the subtree node-by-node */ do { - struct kernfs_iattrs *ps_iattr; - pos = kernfs_leftmost_descendant(kn); - if (pos->parent) { - kernfs_unlink_sibling(pos); + /* + * We're gonna release kernfs_mutex to unmap bin files, + * Make sure @pos doesn't go away inbetween. + */ + kernfs_get(pos); + + /* + * This must be come before unlinking; otherwise, when + * there are multiple removers, some may finish before + * unmapping is complete. + */ + if (pos->flags & KERNFS_HAS_MMAP) { + mutex_unlock(&kernfs_mutex); + kernfs_unmap_file(pos); + mutex_lock(&kernfs_mutex); + } + + /* + * kernfs_unlink_sibling() succeeds once per node. Use it + * to decide who's responsible for cleanups. + */ + if (!pos->parent || kernfs_unlink_sibling(pos)) { + struct kernfs_iattrs *ps_iattr = + pos->parent ? pos->parent->iattr : NULL; /* update timestamps on the parent */ - ps_iattr = pos->parent->iattr; if (ps_iattr) { ps_iattr->ia_iattr.ia_ctime = CURRENT_TIME; ps_iattr->ia_iattr.ia_mtime = CURRENT_TIME; } + + pos->u.removed_list = acxt->removed; + acxt->removed = pos; } - pos->u.removed_list = acxt->removed; - acxt->removed = pos; + kernfs_put(pos); } while (pos != kn); } diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 231a171..404ffd2 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -700,14 +700,11 @@ static int kernfs_fop_release(struct inode *inode, struct file *filp) return 0; } -void kernfs_unmap_bin_file(struct kernfs_node *kn) +void kernfs_unmap_file(struct kernfs_node *kn) { struct kernfs_open_node *on; struct kernfs_open_file *of; - if (!(kn->flags & KERNFS_HAS_MMAP)) - return; - spin_lock_irq(&kernfs_open_node_lock); on = kn->attr.open; if (on) diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h index 57a93f4..e9ec38c 100644 --- a/fs/kernfs/kernfs-internal.h +++ b/fs/kernfs/kernfs-internal.h @@ -113,7 +113,7 @@ struct kernfs_node *kernfs_new_node(struct kernfs_root *root, const char *name, */ extern const struct file_operations kernfs_file_fops; -void kernfs_unmap_bin_file(struct kernfs_node *kn); +void kernfs_unmap_file(struct kernfs_node *kn); /* * symlink.c |