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Commit c103135c authored by Al Viro's avatar Al Viro
Browse files

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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent d0352d3e

fs/dcache.c

+22 −5
Original line number Diff line number Diff line
@@ -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);

include/linux/dcache.h

+1 −0
Original line number Diff line number Diff line
@@ -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.. */