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Introduce path_get()

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This introduces the symmetric function to path_put() for getting a reference
to the dentry and vfsmount of a struct path in the right order.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Blunck
2008-02-14 19:34:38 -08:00
committed by Linus Torvalds
parent 09da5916ba
commit 5dd784d049
2 changed files with 16 additions and 2 deletions
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17
fs/namei.c
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@@ -362,6 +362,19 @@ int deny_write_access(struct file * file)
return 0; return 0;
} }
/**
* path_get - get a reference to a path
* @path: path to get the reference to
*
* Given a path increment the reference count to the dentry and the vfsmount.
*/
void path_get(struct path *path)
{
mntget(path->mnt);
dget(path->dentry);
}
EXPORT_SYMBOL(path_get);
/** /**
* path_put - put a reference to a path * path_put - put a reference to a path
* @path: path to put the reference to * @path: path to put the reference to
@@ -1160,8 +1173,8 @@ static int do_path_lookup(int dfd, const char *name,
if (retval) if (retval)
goto fput_fail; goto fput_fail;
nd->path.mnt = mntget(file->f_path.mnt); nd->path = file->f_path;
nd->path.dentry = dget(dentry); path_get(&file->f_path);
fput_light(file, fput_needed); fput_light(file, fput_needed);
} }

1
include/linux/path.h
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@@ -9,6 +9,7 @@ struct path {
struct dentry *dentry; struct dentry *dentry;
}; };
extern void path_get(struct path *);
extern void path_put(struct path *); extern void path_put(struct path *);
#endif /* _LINUX_PATH_H */ #endif /* _LINUX_PATH_H */