Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030381Ab2HWKsB (ORCPT ); Thu, 23 Aug 2012 06:48:01 -0400 Received: from mail-lpp01m010-f46.google.com ([209.85.215.46]:63822 "EHLO mail-lpp01m010-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933915Ab2HWKrc (ORCPT ); Thu, 23 Aug 2012 06:47:32 -0400 Message-Id: <20120823104725.912510379@openvz.org> User-Agent: quilt/0.48-1 Date: Thu, 23 Aug 2012 14:43:28 +0400 From: Cyrill Gorcunov To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: Al Viro , Alexey Dobriyan , Andrew Morton , Pavel Emelyanov , James Bottomley , Matthew Helsley , aneesh.kumar@linux.vnet.ibm.com, bfields@fieldses.org, Cyrill Gorcunov , Al Viro Subject: [patch 5/9] fs, notify: Add file handle entry into inotify_inode_mark References: <20120823104323.040550004@openvz.org> Content-Disposition: inline; filename=fsnotify-add-fhandler Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4967 Lines: 146 This file handle will be used in /proc/pid/fdinfo/fd output, which in turn will allow to restore a watch target after checkpoint. Signed-off-by: Cyrill Gorcunov CC: Pavel Emelyanov CC: Al Viro CC: Alexey Dobriyan CC: Andrew Morton CC: James Bottomley CC: "Aneesh Kumar K.V" CC: Alexey Dobriyan CC: Matthew Helsley CC: "J. Bruce Fields" CC: "Aneesh Kumar K.V" --- fs/notify/inotify/inotify.h | 8 +++++++ fs/notify/inotify/inotify_user.c | 42 ++++++++++++++++++++++++++++++++++----- 2 files changed, 45 insertions(+), 5 deletions(-) Index: linux-2.6.git/fs/notify/inotify/inotify.h =================================================================== --- linux-2.6.git.orig/fs/notify/inotify/inotify.h +++ linux-2.6.git/fs/notify/inotify/inotify.h @@ -1,6 +1,7 @@ #include #include #include /* struct kmem_cache */ +#include extern struct kmem_cache *event_priv_cachep; @@ -9,9 +10,16 @@ struct inotify_event_private_data { int wd; }; +#if defined(CONFIG_PROC_FS) && defined(CONFIG_EXPORTFS) && defined(CONFIG_CHECKPOINT_RESTORE) +# define INOTIFY_USE_FHANDLE +#endif + struct inotify_inode_mark { struct fsnotify_mark fsn_mark; int wd; +#ifdef INOTIFY_USE_FHANDLE + __u8 fhandle[sizeof(struct file_handle) + MAX_HANDLE_SZ]; +#endif }; extern void inotify_ignored_and_remove_idr(struct fsnotify_mark *fsn_mark, Index: linux-2.6.git/fs/notify/inotify/inotify_user.c =================================================================== --- linux-2.6.git.orig/fs/notify/inotify/inotify_user.c +++ linux-2.6.git/fs/notify/inotify/inotify_user.c @@ -566,6 +566,33 @@ static void inotify_free_mark(struct fsn kmem_cache_free(inotify_inode_mark_cachep, i_mark); } +#ifdef INOTIFY_USE_FHANDLE +static int inotify_encode_wd_fhandle(struct inotify_inode_mark *mark, struct dentry *dentry) +{ + struct file_handle *fhandle = (struct file_handle *)mark->fhandle; + int size, ret; + + BUILD_BUG_ON(sizeof(mark->fhandle) <= sizeof(struct file_handle)); + + fhandle->handle_bytes = sizeof(mark->fhandle) - sizeof(struct file_handle); + size = fhandle->handle_bytes >> 2; + + ret = exportfs_encode_fh(dentry, (struct fid *)fhandle->f_handle, &size, 0); + if ((ret == 255) || (ret == -ENOSPC)) + return -EOVERFLOW; + + fhandle->handle_type = ret; + fhandle->handle_bytes = size * sizeof(u32); + + return 0; +} +# else +static int inotify_encode_wd_fhandle(struct inotify_inode_mark *mark, struct dentry *dentry) +{ + return 0; +} +#endif + static int inotify_update_existing_watch(struct fsnotify_group *group, struct inode *inode, u32 arg) @@ -621,10 +648,11 @@ static int inotify_update_existing_watch } static int inotify_new_watch(struct fsnotify_group *group, - struct inode *inode, + struct dentry *dentry, u32 arg) { struct inotify_inode_mark *tmp_i_mark; + struct inode *inode = dentry->d_inode; __u32 mask; int ret; struct idr *idr = &group->inotify_data.idr; @@ -647,6 +675,10 @@ static int inotify_new_watch(struct fsno if (atomic_read(&group->inotify_data.user->inotify_watches) >= inotify_max_user_watches) goto out_err; + ret = inotify_encode_wd_fhandle(tmp_i_mark, dentry); + if (ret) + goto out_err; + ret = inotify_add_to_idr(idr, idr_lock, &group->inotify_data.last_wd, tmp_i_mark); if (ret) @@ -673,16 +705,16 @@ out_err: return ret; } -static int inotify_update_watch(struct fsnotify_group *group, struct inode *inode, u32 arg) +static int inotify_update_watch(struct fsnotify_group *group, struct dentry *dentry, u32 arg) { int ret = 0; retry: /* try to update and existing watch with the new arg */ - ret = inotify_update_existing_watch(group, inode, arg); + ret = inotify_update_existing_watch(group, dentry->d_inode, arg); /* no mark present, try to add a new one */ if (ret == -ENOENT) - ret = inotify_new_watch(group, inode, arg); + ret = inotify_new_watch(group, dentry, arg); /* * inotify_new_watch could race with another thread which did an * inotify_new_watch between the update_existing and the add watch @@ -785,7 +817,7 @@ SYSCALL_DEFINE3(inotify_add_watch, int, group = filp->private_data; /* create/update an inode mark */ - ret = inotify_update_watch(group, inode, mask); + ret = inotify_update_watch(group, path.dentry, mask); path_put(&path); fput_and_out: fput_light(filp, fput_needed); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/