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ovl: move copy up lock out

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Move ovl_copy_up_start()/ovl_copy_up_end() out so that it's used for both
tempfile and workdir copy ups.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-07-04 22:03:18 +02:00
parent a6fb235a44
commit fd210b7d67
1 changed files with 13 additions and 25 deletions
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38
fs/overlayfs/copy_up.c
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@ -506,36 +506,17 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
/* Should we copyup with O_TMPFILE or with workdir? */
if (S_ISREG(c->stat.mode) && ofs->tmpfile) {
err = ovl_copy_up_start(c->dentry);
/* err < 0: interrupted, err > 0: raced with another copy-up */
if (unlikely(err)) {
pr_debug("ovl_copy_up_start(%pd2) = %i\n", c->dentry,
err);
if (err > 0)
err = 0;
goto out_done;
}
c->tmpfile = true;
err = ovl_copy_up_locked(c);
ovl_copy_up_end(c->dentry);
goto out_done;
return ovl_copy_up_locked(c);
}
err = -EIO;
if (lock_rename(c->workdir, c->upperdir) != NULL) {
pr_err("overlayfs: failed to lock workdir+upperdir\n");
goto out_unlock;
} else {
err = ovl_copy_up_locked(c);
unlock_rename(c->workdir, c->upperdir);
}
if (ovl_dentry_upper(c->dentry)) {
/* Raced with another copy-up? Nothing to do, then... */
err = 0;
goto out_unlock;
}
err = ovl_copy_up_locked(c);
out_unlock:
unlock_rename(c->workdir, c->upperdir);
out_done:
return err;
}
@ -580,8 +561,15 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
}
ovl_do_check_copy_up(ctx.lowerpath.dentry);
err = ovl_do_copy_up(&ctx);
err = ovl_copy_up_start(dentry);
/* err < 0: interrupted, err > 0: raced with another copy-up */
if (unlikely(err)) {
if (err > 0)
err = 0;
} else {
err = ovl_do_copy_up(&ctx);
ovl_copy_up_end(dentry);
}
do_delayed_call(&done);
return err;