xiaomi-sm8450/android_kernel_xiaomi_sm8450
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[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2013-06-07 01:20:27 -04:00
parent f9652e10c1
commit 60545d0d46
12 changed files with 164 additions and 5 deletions
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60
fs/namei.c
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@@ -2902,6 +2902,61 @@ stale_open:
goto retry_lookup;
}
static int do_tmpfile(int dfd, struct filename *pathname,
struct nameidata *nd, int flags,
const struct open_flags *op,
struct file *file, int *opened)
{
static const struct qstr name = QSTR_INIT("/", 1);
struct dentry *dentry, *child;
struct inode *dir;
int error = path_lookupat(dfd, pathname->name,
flags | LOOKUP_DIRECTORY, nd);
if (unlikely(error))
return error;
error = mnt_want_write(nd->path.mnt);
if (unlikely(error))
goto out;
/* we want directory to be writable */
error = inode_permission(nd->inode, MAY_WRITE | MAY_EXEC);
if (error)
goto out2;
dentry = nd->path.dentry;
dir = dentry->d_inode;
if (!dir->i_op->tmpfile) {
error = -EOPNOTSUPP;
goto out2;
}
child = d_alloc(dentry, &name);
if (unlikely(!child)) {
error = -ENOMEM;
goto out2;
}
nd->flags &= ~LOOKUP_DIRECTORY;
nd->flags |= op->intent;
dput(nd->path.dentry);
nd->path.dentry = child;
error = dir->i_op->tmpfile(dir, nd->path.dentry, op->mode);
if (error)
goto out2;
audit_inode(pathname, nd->path.dentry, 0);
error = may_open(&nd->path, op->acc_mode, op->open_flag);
if (error)
goto out2;
file->f_path.mnt = nd->path.mnt;
error = finish_open(file, nd->path.dentry, NULL, opened);
if (error)
goto out2;
error = open_check_o_direct(file);
if (error)
fput(file);
out2:
mnt_drop_write(nd->path.mnt);
out:
path_put(&nd->path);
return error;
}
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
@@ -2917,6 +2972,11 @@ static struct file *path_openat(int dfd, struct filename *pathname,
file->f_flags = op->open_flag;
if (unlikely(file->f_flags & O_TMPFILE)) {
error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
goto out;
}
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
if (unlikely(error))
goto out;