diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-09-22 16:45:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:42 -0700 |
| commit | 678ad5d8aaf8925cb8465f84e1e47d9b1284666a (patch) | |
| tree | 638189ae49da8da3dff9ba2f422f16a734b9388c /fs/proc | |
| parent | 90396f96b7da0e2305ffe0266d22b6f8221f28ba (diff) | |
| download | linux-678ad5d8aaf8925cb8465f84e1e47d9b1284666a.tar.bz2 | |
/proc/kcore: fix stat.st_size
Presently the size of /proc/kcore which can be read by 'ls -l' is 0. But
it's not the correct value.
On x86-64, ls -l shows
... root root 140737486266368 2009-09-17 10:29 /proc/kcore
Then, 7FFFFFFE02000. This comes from vmalloc area's size.
(*) This shows "core" size, not memory size.
This patch shows the size by updating "size" field in struct
proc_dir_entry. Later, lookup routine will create inode and fill
inode->i_size based on this value. Then, this has a problem.
- Once inode is cached, inode->i_size will never be updated.
Then, this patch is not memory-hotplug-aware.
To update inode->i_size, we have to know dentry or inode.
But there is no way to lookup them by inside kernel. Hmmm....
Next patch will try it.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/kcore.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 70733780fdd9..3d0485c361c7 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -107,6 +107,8 @@ static void free_kclist_ents(struct list_head *head) */ static void __kcore_update_ram(struct list_head *list) { + int nphdr; + size_t size; struct kcore_list *tmp, *pos; LIST_HEAD(garbage); @@ -121,6 +123,7 @@ static void __kcore_update_ram(struct list_head *list) } else list_splice(list, &garbage); kcore_need_update = 0; + proc_root_kcore->size = get_kcore_size(&nphdr, &size); write_unlock(&kclist_lock); free_kclist_ents(&garbage); @@ -429,7 +432,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) unsigned long start; read_lock(&kclist_lock); - proc_root_kcore->size = size = get_kcore_size(&nphdr, &elf_buflen); + size = get_kcore_size(&nphdr, &elf_buflen); + if (buflen == 0 || *fpos >= size) { read_unlock(&kclist_lock); return 0; |