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shmem_setup_file(): use d_alloc_pseudo() instead of d_alloc()

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Note that provided ->d_dname() reproduces what we used to get for
those guys in e.g. /proc/self/maps; it might be a good idea to change
that to something less ugly, but for now let's keep the existing
user-visible behaviour

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-02-14 22:38:02 -05:00
parent 3f3834c354
commit 3451538a11
1 changed files with 15 additions and 4 deletions
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19
mm/shmem.c
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@ -2865,6 +2865,16 @@ EXPORT_SYMBOL_GPL(shmem_truncate_range);
/* common code */
static char *shmem_dname(struct dentry *dentry, char *buffer, int buflen)
{
return dynamic_dname(dentry, buffer, buflen, "/%s (deleted)",
dentry->d_name.name);
}
static struct dentry_operations anon_ops = {
.d_dname = shmem_dname
};
/**
* shmem_file_setup - get an unlinked file living in tmpfs
* @name: name for dentry (to be seen in /proc/<pid>/maps
@ -2876,7 +2886,7 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
struct file *res;
struct inode *inode;
struct path path;
struct dentry *root;
struct super_block *sb;
struct qstr this;
if (IS_ERR(shm_mnt))
@ -2892,14 +2902,15 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
this.name = name;
this.len = strlen(name);
this.hash = 0; /* will go */
root = shm_mnt->mnt_root;
path.dentry = d_alloc(root, &this);
sb = shm_mnt->mnt_sb;
path.dentry = d_alloc_pseudo(sb, &this);
if (!path.dentry)
goto put_memory;
d_set_d_op(path.dentry, &anon_ops);
path.mnt = mntget(shm_mnt);
res = ERR_PTR(-ENOSPC);
inode = shmem_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0, flags);
inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags);
if (!inode)
goto put_dentry;