Return-Path: Received: from mx2.suse.de ([195.135.220.15]:35844 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1732203AbeGaWxU (ORCPT ); Tue, 31 Jul 2018 18:53:20 -0400 From: Mark Fasheh To: Al Viro , linux-fsdevel@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, Andrew Morton , Amir Goldstein , linux-unionfs@vger.kernel.org, Jeff Mahoney , linux-nfs@vger.kernel.org, Mark Fasheh Subject: [PATCH 3/4] proc: use vfs helper to get ino/dev pairs for maps file Date: Tue, 31 Jul 2018 14:10:44 -0700 Message-Id: <20180731211045.5671-4-mfasheh@suse.de> In-Reply-To: <20180731211045.5671-1-mfasheh@suse.de> References: <20180731211045.5671-1-mfasheh@suse.de> Sender: linux-nfs-owner@vger.kernel.org List-ID: Proc writes ino/dev into /proc/PID/maps which it gets from i_ino and s_dev. The problem with this is that i_ino and s_dev are not guaranteed to be unique - we can have duplicates in the maps file for otherwise distinct inodes. This breaks any software expecting them to be unique, including lsof(8). We can fix this by using vfs_map_unique_ino_dev() to map the unique ino/dev pair for us. Signed-off-by: Mark Fasheh --- fs/proc/nommu.c | 11 ++++------- fs/proc/task_mmu.c | 8 +++----- fs/proc/task_nommu.c | 8 +++----- 3 files changed, 10 insertions(+), 17 deletions(-) diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c index 3b63be64e436..56c12d02c5ad 100644 --- a/fs/proc/nommu.c +++ b/fs/proc/nommu.c @@ -36,7 +36,7 @@ */ static int nommu_region_show(struct seq_file *m, struct vm_region *region) { - unsigned long ino = 0; + u64 ino = 0; struct file *file; dev_t dev = 0; int flags; @@ -44,15 +44,12 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region) flags = region->vm_flags; file = region->vm_file; - if (file) { - struct inode *inode = file_inode(region->vm_file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; - } + if (file) + vfs_map_unique_ino_dev(file_dentry(file), &ino, &dev); { seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); seq_printf(m, - "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", + "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %llu ", region->vm_start, region->vm_end, flags & VM_READ ? 'r' : '-', diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index dfd73a4616ce..e9cd33425191 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -276,7 +276,7 @@ static int is_stack(struct vm_area_struct *vma) static void show_vma_header_prefix(struct seq_file *m, unsigned long start, unsigned long end, vm_flags_t flags, unsigned long long pgoff, - dev_t dev, unsigned long ino) + dev_t dev, u64 ino) { seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); seq_put_hex_ll(m, NULL, start, 8); @@ -299,16 +299,14 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) struct mm_struct *mm = vma->vm_mm; struct file *file = vma->vm_file; vm_flags_t flags = vma->vm_flags; - unsigned long ino = 0; + u64 ino = 0; unsigned long long pgoff = 0; unsigned long start, end; dev_t dev = 0; const char *name = NULL; if (file) { - struct inode *inode = file_inode(vma->vm_file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; + vfs_map_unique_ino_dev(file_dentry(file), &ino, &dev); pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; } diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c index 5b62f57bd9bc..1198e979ed3f 100644 --- a/fs/proc/task_nommu.c +++ b/fs/proc/task_nommu.c @@ -146,7 +146,7 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, int is_pid) { struct mm_struct *mm = vma->vm_mm; - unsigned long ino = 0; + u64 ino = 0; struct file *file; dev_t dev = 0; int flags; @@ -156,15 +156,13 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, file = vma->vm_file; if (file) { - struct inode *inode = file_inode(vma->vm_file); - dev = inode->i_sb->s_dev; - ino = inode->i_ino; + vfs_map_unique_inode_dev(file_dentry(file), &ino, &dev)); pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; } seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); seq_printf(m, - "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", + "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %llu ", vma->vm_start, vma->vm_end, flags & VM_READ ? 'r' : '-', -- 2.15.1