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authorMatt Helsley <matthltc@us.ibm.com>2008-04-29 04:01:36 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 11:06:17 -0400
commit925d1c401fa6cfd0df5d2e37da8981494ccdec07 (patch)
tree4f3b7a09311cd99783b822350628125e44f9902d /fs/exec.c
parente93b4ea20adb20f1f1f07f10ba5d7dd739d2843e (diff)
procfs task exe symlink
The kernel implements readlink of /proc/pid/exe by getting the file from the first executable VMA. Then the path to the file is reconstructed and reported as the result. Because of the VMA walk the code is slightly different on nommu systems. This patch avoids separate /proc/pid/exe code on nommu systems. Instead of walking the VMAs to find the first executable file-backed VMA we store a reference to the exec'd file in the mm_struct. That reference would prevent the filesystem holding the executable file from being unmounted even after unmapping the VMAs. So we track the number of VM_EXECUTABLE VMAs and drop the new reference when the last one is unmapped. This avoids pinning the mounted filesystem. [akpm@linux-foundation.org: improve comments] [yamamoto@valinux.co.jp: fix dup_mmap] Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: David Howells <dhowells@redhat.com> Cc:"Eric W. Biederman" <ebiederm@xmission.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r--fs/exec.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 711bc45d789c..a13883903ee9 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -964,6 +964,8 @@ int flush_old_exec(struct linux_binprm * bprm)
964 if (retval) 964 if (retval)
965 goto out; 965 goto out;
966 966
967 set_mm_exe_file(bprm->mm, bprm->file);
968
967 /* 969 /*
968 * Release all of the old mmap stuff 970 * Release all of the old mmap stuff
969 */ 971 */