void __inode_dir_notify(struct inode *inode, unsigned long event) { struct dnotify_struct * dn; struct dnotify_struct **prev; struct fown_struct * fown; int changed = 0; write_lock(&dn_lock); prev = &inode->i_dnotify; while ((dn = *prev) != NULL) { if (dn->dn_magic != DNOTIFY_MAGIC) { printk(KERN_ERR "__inode_dir_notify: bad magic " "number in dnotify_struct!\n"); goto out; } if ((dn->dn_mask & event) == 0) { prev = &dn->dn_next; continue; } fown = &dn->dn_filp->f_owner; if (fown->pid) send_sigio(fown, dn->dn_fd, POLL_MSG); if (dn->dn_mask & DN_MULTISHOT) prev = &dn->dn_next; else { *prev = dn->dn_next; changed = 1; kmem_cache_free(dn_cache, dn); } } if (changed) redo_inode_mask(inode); out: write_unlock(&dn_lock); }
void __inode_dir_notify(struct inode *inode, unsigned long event) { struct dnotify_struct * dn; struct dnotify_struct **prev; struct fown_struct * fown; int changed = 0; spin_lock(&inode->i_lock); prev = &inode->i_dnotify; while ((dn = *prev) != NULL) { if ((dn->dn_mask & event) == 0) { prev = &dn->dn_next; continue; } fown = &dn->dn_filp->f_owner; send_sigio(fown, dn->dn_fd, POLL_MSG); if (dn->dn_mask & DN_MULTISHOT) prev = &dn->dn_next; else { *prev = dn->dn_next; changed = 1; kmem_cache_free(dn_cache, dn); } } if (changed) redo_inode_mask(inode); spin_unlock(&inode->i_lock); }
int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) { struct dnotify_struct *dn = NULL; struct dnotify_struct *odn; struct dnotify_struct **prev; struct inode *inode; int turning_off = (arg & ~DN_MULTISHOT) == 0; int error = 0; if (!turning_off && !dir_notify_enable) return -EINVAL; inode = filp->f_dentry->d_inode; if (!S_ISDIR(inode->i_mode)) return -ENOTDIR; if (!turning_off) { dn = kmem_cache_alloc(dn_cache, SLAB_KERNEL); if (dn == NULL) return -ENOMEM; } write_lock(&dn_lock); prev = &inode->i_dnotify; for (odn = *prev; odn != NULL; prev = &odn->dn_next, odn = *prev) if (odn->dn_filp == filp) break; if (odn != NULL) { if (turning_off) { *prev = odn->dn_next; redo_inode_mask(inode); dn = odn; goto out_free; } odn->dn_fd = fd; odn->dn_mask |= arg; inode->i_dnotify_mask |= arg & ~DN_MULTISHOT; goto out_free; } if (turning_off) goto out; if ((error = security_file_set_fowner(filp))) goto out_free; filp->f_owner.pid = current->pid; filp->f_owner.uid = current->uid; filp->f_owner.euid = current->euid; dn->dn_magic = DNOTIFY_MAGIC; dn->dn_mask = arg; dn->dn_fd = fd; dn->dn_filp = filp; inode->i_dnotify_mask |= arg & ~DN_MULTISHOT; dn->dn_next = inode->i_dnotify; inode->i_dnotify = dn; out: write_unlock(&dn_lock); return error; out_free: kmem_cache_free(dn_cache, dn); goto out; }
void dnotify_flush(struct file *filp, fl_owner_t id) { struct dnotify_struct *dn; struct dnotify_struct **prev; struct inode *inode; inode = filp->f_dentry->d_inode; if (!S_ISDIR(inode->i_mode)) return; spin_lock(&inode->i_lock); prev = &inode->i_dnotify; while ((dn = *prev) != NULL) { if ((dn->dn_owner == id) && (dn->dn_filp == filp)) { *prev = dn->dn_next; redo_inode_mask(inode); kmem_cache_free(dn_cache, dn); break; } prev = &dn->dn_next; } spin_unlock(&inode->i_lock); }