From 23fa18eaa71266feff7ba8d83022d9e1cc83c65a Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:42:03 +0000
Subject: [PATCH] disable pwm7
---
kernel/fs/overlayfs/export.c | 171 +++++++++++++++++++++++++++++++-------------------------
1 files changed, 95 insertions(+), 76 deletions(-)
diff --git a/kernel/fs/overlayfs/export.c b/kernel/fs/overlayfs/export.c
index ba6c7c5..f981283 100644
--- a/kernel/fs/overlayfs/export.c
+++ b/kernel/fs/overlayfs/export.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Overlayfs NFS export support.
*
* Amir Goldstein <amir73il@gmail.com>
*
* Copyright (C) 2017-2018 CTERA Networks. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
*/
#include <linux/fs.h>
@@ -33,7 +30,7 @@
}
if (err) {
- pr_warn_ratelimited("overlayfs: failed to copy up on encode (%pd2, err=%i)\n",
+ pr_warn_ratelimited("failed to copy up on encode (%pd2, err=%i)\n",
dentry, err);
}
@@ -207,17 +204,18 @@
* ovl_connect_layer() will try to make origin's layer "connected" by
* copying up a "connectable" ancestor.
*/
- if (d_is_dir(dentry) && ofs->upper_mnt)
+ if (d_is_dir(dentry) && ovl_upper_mnt(ofs))
return ovl_connect_layer(dentry);
/* Lower file handle for indexed and non-upper dir/non-dir */
return 1;
}
-static int ovl_d_to_fh(struct dentry *dentry, char *buf, int buflen)
+static int ovl_dentry_to_fid(struct dentry *dentry, u32 *fid, int buflen)
{
struct ovl_fh *fh = NULL;
int err, enc_lower;
+ int len;
/*
* Check if we should encode a lower or upper file handle and maybe
@@ -233,57 +231,45 @@
if (IS_ERR(fh))
return PTR_ERR(fh);
- err = -EOVERFLOW;
- if (fh->len > buflen)
- goto fail;
-
- memcpy(buf, (char *)fh, fh->len);
- err = fh->len;
+ len = OVL_FH_LEN(fh);
+ if (len <= buflen)
+ memcpy(fid, fh, len);
+ err = len;
out:
kfree(fh);
return err;
fail:
- pr_warn_ratelimited("overlayfs: failed to encode file handle (%pd2, err=%i, buflen=%d, len=%d, type=%d)\n",
- dentry, err, buflen, fh ? (int)fh->len : 0,
- fh ? fh->type : 0);
+ pr_warn_ratelimited("failed to encode file handle (%pd2, err=%i)\n",
+ dentry, err);
goto out;
-}
-
-static int ovl_dentry_to_fh(struct dentry *dentry, u32 *fid, int *max_len)
-{
- int res, len = *max_len << 2;
-
- res = ovl_d_to_fh(dentry, (char *)fid, len);
- if (res <= 0)
- return FILEID_INVALID;
-
- len = res;
-
- /* Round up to dwords */
- *max_len = (len + 3) >> 2;
- return OVL_FILEID;
}
static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len,
struct inode *parent)
{
struct dentry *dentry;
- int type;
+ int bytes, buflen = *max_len << 2;
/* TODO: encode connectable file handles */
if (parent)
return FILEID_INVALID;
dentry = d_find_any_alias(inode);
- if (WARN_ON(!dentry))
+ if (!dentry)
return FILEID_INVALID;
- type = ovl_dentry_to_fh(dentry, fid, max_len);
-
+ bytes = ovl_dentry_to_fid(dentry, fid, buflen);
dput(dentry);
- return type;
+ if (bytes <= 0)
+ return FILEID_INVALID;
+
+ *max_len = bytes >> 2;
+ if (bytes > buflen)
+ return FILEID_INVALID;
+
+ return OVL_FILEID_V1;
}
/*
@@ -320,29 +306,34 @@
ovl_set_flag(OVL_UPPERDATA, inode);
dentry = d_find_any_alias(inode);
- if (!dentry) {
- dentry = d_alloc_anon(inode->i_sb);
- if (!dentry)
- goto nomem;
- oe = ovl_alloc_entry(lower ? 1 : 0);
- if (!oe)
- goto nomem;
+ if (dentry)
+ goto out_iput;
- if (lower) {
- oe->lowerstack->dentry = dget(lower);
- oe->lowerstack->layer = lowerpath->layer;
- }
- dentry->d_fsdata = oe;
- if (upper_alias)
- ovl_dentry_set_upper_alias(dentry);
+ dentry = d_alloc_anon(inode->i_sb);
+ if (unlikely(!dentry))
+ goto nomem;
+ oe = ovl_alloc_entry(lower ? 1 : 0);
+ if (!oe)
+ goto nomem;
+
+ if (lower) {
+ oe->lowerstack->dentry = dget(lower);
+ oe->lowerstack->layer = lowerpath->layer;
}
+ dentry->d_fsdata = oe;
+ if (upper_alias)
+ ovl_dentry_set_upper_alias(dentry);
+
+ ovl_dentry_init_reval(dentry, upper);
return d_instantiate_anon(dentry, inode);
nomem:
- iput(inode);
dput(dentry);
- return ERR_PTR(-ENOMEM);
+ dentry = ERR_PTR(-ENOMEM);
+out_iput:
+ iput(inode);
+ return dentry;
}
/* Get the upper or lower dentry in stach whose on layer @idx */
@@ -370,7 +361,7 @@
*/
static struct dentry *ovl_lookup_real_one(struct dentry *connected,
struct dentry *real,
- struct ovl_layer *layer)
+ const struct ovl_layer *layer)
{
struct inode *dir = d_inode(connected);
struct dentry *this, *parent = NULL;
@@ -397,7 +388,8 @@
* pointer because we hold no lock on the real dentry.
*/
take_dentry_name_snapshot(&name, real);
- this = lookup_one_len(name.name, connected, strlen(name.name));
+ this = lookup_one_len(name.name.name, connected, name.name.len);
+ release_dentry_name_snapshot(&name);
err = PTR_ERR(this);
if (IS_ERR(this)) {
goto fail;
@@ -412,13 +404,12 @@
}
out:
- release_dentry_name_snapshot(&name);
dput(parent);
inode_unlock(dir);
return this;
fail:
- pr_warn_ratelimited("overlayfs: failed to lookup one by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",
+ pr_warn_ratelimited("failed to lookup one by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",
real, layer->idx, connected, err);
this = ERR_PTR(err);
goto out;
@@ -426,17 +417,16 @@
static struct dentry *ovl_lookup_real(struct super_block *sb,
struct dentry *real,
- struct ovl_layer *layer);
+ const struct ovl_layer *layer);
/*
* Lookup an indexed or hashed overlay dentry by real inode.
*/
static struct dentry *ovl_lookup_real_inode(struct super_block *sb,
struct dentry *real,
- struct ovl_layer *layer)
+ const struct ovl_layer *layer)
{
struct ovl_fs *ofs = sb->s_fs_info;
- struct ovl_layer upper_layer = { .mnt = ofs->upper_mnt };
struct dentry *index = NULL;
struct dentry *this = NULL;
struct inode *inode;
@@ -478,7 +468,7 @@
* recursive call walks back from indexed upper to the topmost
* connected/hashed upper parent (or up to root).
*/
- this = ovl_lookup_real(sb, upper, &upper_layer);
+ this = ovl_lookup_real(sb, upper, &ofs->layers[0]);
dput(upper);
}
@@ -499,7 +489,7 @@
*/
static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,
struct dentry *real,
- struct ovl_layer *layer)
+ const struct ovl_layer *layer)
{
struct dentry *next, *parent = NULL;
struct dentry *ancestor = ERR_PTR(-EIO);
@@ -552,7 +542,7 @@
*/
static struct dentry *ovl_lookup_real(struct super_block *sb,
struct dentry *real,
- struct ovl_layer *layer)
+ const struct ovl_layer *layer)
{
struct dentry *connected;
int err = 0;
@@ -643,7 +633,7 @@
return connected;
fail:
- pr_warn_ratelimited("overlayfs: failed to lookup by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",
+ pr_warn_ratelimited("failed to lookup by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",
real, layer->idx, connected, err);
dput(connected);
return ERR_PTR(err);
@@ -658,8 +648,7 @@
struct dentry *index)
{
struct ovl_fs *ofs = sb->s_fs_info;
- struct ovl_layer upper_layer = { .mnt = ofs->upper_mnt };
- struct ovl_layer *layer = upper ? &upper_layer : lowerpath->layer;
+ const struct ovl_layer *layer = upper ? &ofs->layers[0] : lowerpath->layer;
struct dentry *real = upper ?: (index ?: lowerpath->dentry);
/*
@@ -687,10 +676,10 @@
struct dentry *dentry;
struct dentry *upper;
- if (!ofs->upper_mnt)
+ if (!ovl_upper_mnt(ofs))
return ERR_PTR(-EACCES);
- upper = ovl_decode_real_fh(fh, ofs->upper_mnt, true);
+ upper = ovl_decode_real_fh(fh, ovl_upper_mnt(ofs), true);
if (IS_ERR_OR_NULL(upper))
return upper;
@@ -762,7 +751,7 @@
goto out_err;
}
if (index) {
- err = ovl_verify_origin(index, origin.dentry, false);
+ err = ovl_verify_origin(ofs, index, origin.dentry, false);
if (err)
goto out_err;
}
@@ -780,24 +769,48 @@
goto out;
}
+static struct ovl_fh *ovl_fid_to_fh(struct fid *fid, int buflen, int fh_type)
+{
+ struct ovl_fh *fh;
+
+ /* If on-wire inner fid is aligned - nothing to do */
+ if (fh_type == OVL_FILEID_V1)
+ return (struct ovl_fh *)fid;
+
+ if (fh_type != OVL_FILEID_V0)
+ return ERR_PTR(-EINVAL);
+
+ if (buflen <= OVL_FH_WIRE_OFFSET)
+ return ERR_PTR(-EINVAL);
+
+ fh = kzalloc(buflen, GFP_KERNEL);
+ if (!fh)
+ return ERR_PTR(-ENOMEM);
+
+ /* Copy unaligned inner fh into aligned buffer */
+ memcpy(&fh->fb, fid, buflen - OVL_FH_WIRE_OFFSET);
+ return fh;
+}
+
static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
struct dentry *dentry = NULL;
- struct ovl_fh *fh = (struct ovl_fh *) fid;
+ struct ovl_fh *fh = NULL;
int len = fh_len << 2;
unsigned int flags = 0;
int err;
- err = -EINVAL;
- if (fh_type != OVL_FILEID)
+ fh = ovl_fid_to_fh(fid, len, fh_type);
+ err = PTR_ERR(fh);
+ if (IS_ERR(fh))
goto out_err;
err = ovl_check_fh_len(fh, len);
if (err)
goto out_err;
- flags = fh->flags;
+ flags = fh->fb.flags;
dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?
ovl_upper_fh_to_d(sb, fh) :
ovl_lower_fh_to_d(sb, fh);
@@ -805,18 +818,24 @@
if (IS_ERR(dentry) && err != -ESTALE)
goto out_err;
+out:
+ /* We may have needed to re-align OVL_FILEID_V0 */
+ if (!IS_ERR_OR_NULL(fh) && fh != (void *)fid)
+ kfree(fh);
+
return dentry;
out_err:
- pr_warn_ratelimited("overlayfs: failed to decode file handle (len=%d, type=%d, flags=%x, err=%i)\n",
- len, fh_type, flags, err);
- return ERR_PTR(err);
+ pr_warn_ratelimited("failed to decode file handle (len=%d, type=%d, flags=%x, err=%i)\n",
+ fh_len, fh_type, flags, err);
+ dentry = ERR_PTR(err);
+ goto out;
}
static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
- pr_warn_ratelimited("overlayfs: connectable file handles not supported; use 'no_subtree_check' exportfs option.\n");
+ pr_warn_ratelimited("connectable file handles not supported; use 'no_subtree_check' exportfs option.\n");
return ERR_PTR(-EACCES);
}
--
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