From c103135c14e03fc9a9e5f0adc01df9ad272cf2a1 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 6 Jun 2010 22:31:14 -0400
Subject: [PATCH] new helper: __dentry_path()
builds path relative to fs root, called under dcache_lock,
doesn't append any nonsense to unlinked ones.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/dcache.c | 27 ++++++++++++++++++++++-----
include/linux/dcache.h | 1 +
2 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 86d4db15473e5..caf08574982fc 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2049,16 +2049,12 @@ char *dynamic_dname(struct dentry *dentry, char *buffer, int buflen,
/*
* Write full pathname from the root of the filesystem into the buffer.
*/
-char *dentry_path(struct dentry *dentry, char *buf, int buflen)
+char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
{
char *end = buf + buflen;
char *retval;
- spin_lock(&dcache_lock);
prepend(&end, &buflen, "\0", 1);
- if (d_unlinked(dentry) &&
- (prepend(&end, &buflen, "//deleted", 9) != 0))
- goto Elong;
if (buflen < 1)
goto Elong;
/* Get '/' right */
@@ -2076,7 +2072,28 @@ char *dentry_path(struct dentry *dentry, char *buf, int buflen)
retval = end;
dentry = parent;
}
+ return retval;
+Elong:
+ return ERR_PTR(-ENAMETOOLONG);
+}
+EXPORT_SYMBOL(__dentry_path);
+
+char *dentry_path(struct dentry *dentry, char *buf, int buflen)
+{
+ char *p = NULL;
+ char *retval;
+
+ spin_lock(&dcache_lock);
+ if (d_unlinked(dentry)) {
+ p = buf + buflen;
+ if (prepend(&p, &buflen, "//deleted", 10) != 0)
+ goto Elong;
+ buflen++;
+ }
+ retval = __dentry_path(dentry, buf, buflen);
spin_unlock(&dcache_lock);
+ if (!IS_ERR(retval) && p)
+ *p = '/'; /* restore '/' overriden with '\0' */
return retval;
Elong:
spin_unlock(&dcache_lock);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index eebb617c17d89..d23be0386e2d3 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -315,6 +315,7 @@ extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
extern char *__d_path(const struct path *path, struct path *root, char *, int);
extern char *d_path(const struct path *, char *, int);
+extern char *__dentry_path(struct dentry *, char *, int);
extern char *dentry_path(struct dentry *, char *, int);
/* Allocation counts.. */
--
GitLab