From a36159eec6ca17402b0e146b86efaf76568dc353 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 20 Sep 2024 01:41:23 +0000
Subject: [PATCH] 重命名 AX88772C_eeprom/asix.c 为 asix_mac.c
---
kernel/fs/overlayfs/copy_up.c | 416 +++++++++++++++++++++++++++++++++++++----------------------
1 files changed, 261 insertions(+), 155 deletions(-)
diff --git a/kernel/fs/overlayfs/copy_up.c b/kernel/fs/overlayfs/copy_up.c
index fb70ec3..84f5596 100644
--- a/kernel/fs/overlayfs/copy_up.c
+++ b/kernel/fs/overlayfs/copy_up.c
@@ -1,10 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2011 Novell Inc.
- *
- * 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/module.h>
@@ -27,7 +24,7 @@
static int ovl_ccup_set(const char *buf, const struct kernel_param *param)
{
- pr_warn("overlayfs: \"check_copy_up\" module option is obsolete\n");
+ pr_warn("\"check_copy_up\" module option is obsolete\n");
return 0;
}
@@ -37,9 +34,17 @@
}
module_param_call(check_copy_up, ovl_ccup_set, ovl_ccup_get, NULL, 0644);
-MODULE_PARM_DESC(ovl_check_copy_up, "Obsolete; does nothing");
+MODULE_PARM_DESC(check_copy_up, "Obsolete; does nothing");
-int ovl_copy_xattr(struct dentry *old, struct dentry *new)
+static bool ovl_must_copy_xattr(const char *name)
+{
+ return !strcmp(name, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(name, XATTR_POSIX_ACL_DEFAULT) ||
+ !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN);
+}
+
+int ovl_copy_xattr(struct super_block *sb, struct dentry *old,
+ struct dentry *new)
{
ssize_t list_size, size, value_size = 0;
char *buf, *name, *value = NULL;
@@ -77,7 +82,7 @@
}
list_size -= slen;
- if (ovl_is_private_xattr(name))
+ if (ovl_is_private_xattr(sb, name))
continue;
error = security_inode_copy_up_xattr(name);
@@ -111,8 +116,13 @@
}
error = vfs_setxattr(new, name, value, size, 0);
- if (error)
- break;
+ if (error) {
+ if (error != -EOPNOTSUPP || ovl_must_copy_xattr(name))
+ break;
+
+ /* Ignore failure to copy unknown xattrs */
+ error = 0;
+ }
}
kfree(value);
out:
@@ -120,12 +130,17 @@
return error;
}
-static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
+static int ovl_copy_up_data(struct ovl_fs *ofs, struct path *old,
+ struct path *new, loff_t len)
{
struct file *old_file;
struct file *new_file;
loff_t old_pos = 0;
loff_t new_pos = 0;
+ loff_t cloned;
+ loff_t data_pos = -1;
+ loff_t hole_len;
+ bool skip_hole = false;
int error = 0;
if (len == 0)
@@ -142,13 +157,16 @@
}
/* Try to use clone_file_range to clone up within the same fs */
- error = do_clone_file_range(old_file, 0, new_file, 0, len);
- if (!error)
+ cloned = do_clone_file_range(old_file, 0, new_file, 0, len, 0);
+ if (cloned == len)
goto out;
/* Couldn't clone, so now we try to copy the data */
- error = 0;
- /* FIXME: copy up sparse files efficiently */
+ /* Check if lower fs supports seek operation */
+ if (old_file->f_mode & FMODE_LSEEK &&
+ old_file->f_op->llseek)
+ skip_hole = true;
+
while (len) {
size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
long bytes;
@@ -159,6 +177,36 @@
if (signal_pending_state(TASK_KILLABLE, current)) {
error = -EINTR;
break;
+ }
+
+ /*
+ * Fill zero for hole will cost unnecessary disk space
+ * and meanwhile slow down the copy-up speed, so we do
+ * an optimization for hole during copy-up, it relies
+ * on SEEK_DATA implementation in lower fs so if lower
+ * fs does not support it, copy-up will behave as before.
+ *
+ * Detail logic of hole detection as below:
+ * When we detect next data position is larger than current
+ * position we will skip that hole, otherwise we copy
+ * data in the size of OVL_COPY_UP_CHUNK_SIZE. Actually,
+ * it may not recognize all kind of holes and sometimes
+ * only skips partial of hole area. However, it will be
+ * enough for most of the use cases.
+ */
+
+ if (skip_hole && data_pos < old_pos) {
+ data_pos = vfs_llseek(old_file, old_pos, SEEK_DATA);
+ if (data_pos > old_pos) {
+ hole_len = data_pos - old_pos;
+ len -= hole_len;
+ old_pos = new_pos = data_pos;
+ continue;
+ } else if (data_pos == -ENXIO) {
+ break;
+ } else if (data_pos < 0) {
+ skip_hole = false;
+ }
}
bytes = do_splice_direct(old_file, &old_pos,
@@ -173,7 +221,7 @@
len -= bytes;
}
out:
- if (!error)
+ if (!error && ovl_should_sync(ofs))
error = vfs_fsync(new_file, 0);
fput(new_file);
out_fput:
@@ -231,13 +279,17 @@
struct ovl_fh *ovl_encode_real_fh(struct dentry *real, bool is_upper)
{
struct ovl_fh *fh;
- int fh_type, fh_len, dwords;
- void *buf;
+ int fh_type, dwords;
int buflen = MAX_HANDLE_SZ;
uuid_t *uuid = &real->d_sb->s_uuid;
+ int err;
- buf = kmalloc(buflen, GFP_KERNEL);
- if (!buf)
+ /* Make sure the real fid stays 32bit aligned */
+ BUILD_BUG_ON(OVL_FH_FID_OFFSET % 4);
+ BUILD_BUG_ON(MAX_HANDLE_SZ + OVL_FH_FID_OFFSET > 255);
+
+ fh = kzalloc(buflen + OVL_FH_FID_OFFSET, GFP_KERNEL);
+ if (!fh)
return ERR_PTR(-ENOMEM);
/*
@@ -246,27 +298,19 @@
* the price or reconnecting the dentry.
*/
dwords = buflen >> 2;
- fh_type = exportfs_encode_fh(real, buf, &dwords, 0);
+ fh_type = exportfs_encode_fh(real, (void *)fh->fb.fid, &dwords, 0);
buflen = (dwords << 2);
- fh = ERR_PTR(-EIO);
+ err = -EIO;
if (WARN_ON(fh_type < 0) ||
WARN_ON(buflen > MAX_HANDLE_SZ) ||
WARN_ON(fh_type == FILEID_INVALID))
- goto out;
+ goto out_err;
- BUILD_BUG_ON(MAX_HANDLE_SZ + offsetof(struct ovl_fh, fid) > 255);
- fh_len = offsetof(struct ovl_fh, fid) + buflen;
- fh = kmalloc(fh_len, GFP_KERNEL);
- if (!fh) {
- fh = ERR_PTR(-ENOMEM);
- goto out;
- }
-
- fh->version = OVL_FH_VERSION;
- fh->magic = OVL_FH_MAGIC;
- fh->type = fh_type;
- fh->flags = OVL_FH_FLAG_CPU_ENDIAN;
+ fh->fb.version = OVL_FH_VERSION;
+ fh->fb.magic = OVL_FH_MAGIC;
+ fh->fb.type = fh_type;
+ fh->fb.flags = OVL_FH_FLAG_CPU_ENDIAN;
/*
* When we will want to decode an overlay dentry from this handle
* and all layers are on the same fs, if we get a disconncted real
@@ -274,14 +318,15 @@
* it to upperdentry or to lowerstack is by checking this flag.
*/
if (is_upper)
- fh->flags |= OVL_FH_FLAG_PATH_UPPER;
- fh->len = fh_len;
- fh->uuid = *uuid;
- memcpy(fh->fid, buf, buflen);
+ fh->fb.flags |= OVL_FH_FLAG_PATH_UPPER;
+ fh->fb.len = sizeof(fh->fb) + buflen;
+ fh->fb.uuid = *uuid;
-out:
- kfree(buf);
return fh;
+
+out_err:
+ kfree(fh);
+ return ERR_PTR(err);
}
int ovl_set_origin(struct dentry *dentry, struct dentry *lower,
@@ -304,15 +349,16 @@
/*
* Do not fail when upper doesn't support xattrs.
*/
- err = ovl_check_setxattr(dentry, upper, OVL_XATTR_ORIGIN, fh,
- fh ? fh->len : 0, 0);
+ err = ovl_check_setxattr(dentry, upper, OVL_XATTR_ORIGIN, fh->buf,
+ fh ? fh->fb.len : 0, 0);
kfree(fh);
return err;
}
/* Store file handle of @upper dir in @index dir entry */
-static int ovl_set_upper_fh(struct dentry *upper, struct dentry *index)
+static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper,
+ struct dentry *index)
{
const struct ovl_fh *fh;
int err;
@@ -321,7 +367,7 @@
if (IS_ERR(fh))
return PTR_ERR(fh);
- err = ovl_do_setxattr(index, OVL_XATTR_UPPER, fh, fh->len, 0);
+ err = ovl_do_setxattr(ofs, index, OVL_XATTR_UPPER, fh->buf, fh->fb.len);
kfree(fh);
return err;
@@ -366,7 +412,7 @@
if (IS_ERR(temp))
goto free_name;
- err = ovl_set_upper_fh(upper, temp);
+ err = ovl_set_upper_fh(OVL_FS(dentry->d_sb), upper, temp);
if (err)
goto out;
@@ -396,7 +442,6 @@
struct dentry *destdir;
struct qstr destname;
struct dentry *workdir;
- bool tmpfile;
bool origin;
bool indexed;
bool metacopy;
@@ -430,6 +475,7 @@
/* Restore timestamps on parent (best effort) */
ovl_set_timestamps(upperdir, &c->pstat);
ovl_dentry_set_upper_alias(c->dentry);
+ ovl_dentry_update_reval(c->dentry, upper);
}
}
inode_unlock(udir);
@@ -441,65 +487,9 @@
return err;
}
-static int ovl_install_temp(struct ovl_copy_up_ctx *c, struct dentry *temp,
- struct dentry **newdentry)
-{
- int err;
- struct dentry *upper;
- struct inode *udir = d_inode(c->destdir);
-
- upper = lookup_one_len(c->destname.name, c->destdir, c->destname.len);
- if (IS_ERR(upper))
- return PTR_ERR(upper);
-
- if (c->tmpfile)
- err = ovl_do_link(temp, udir, upper);
- else
- err = ovl_do_rename(d_inode(c->workdir), temp, udir, upper, 0);
-
- if (!err)
- *newdentry = dget(c->tmpfile ? upper : temp);
- dput(upper);
-
- return err;
-}
-
-static struct dentry *ovl_get_tmpfile(struct ovl_copy_up_ctx *c)
-{
- int err;
- struct dentry *temp;
- const struct cred *old_creds = NULL;
- struct cred *new_creds = NULL;
- struct ovl_cattr cattr = {
- /* Can't properly set mode on creation because of the umask */
- .mode = c->stat.mode & S_IFMT,
- .rdev = c->stat.rdev,
- .link = c->link
- };
-
- err = security_inode_copy_up(c->dentry, &new_creds);
- temp = ERR_PTR(err);
- if (err < 0)
- goto out;
-
- if (new_creds)
- old_creds = override_creds(new_creds);
-
- if (c->tmpfile)
- temp = ovl_do_tmpfile(c->workdir, c->stat.mode);
- else
- temp = ovl_create_temp(c->workdir, &cattr);
-out:
- if (new_creds) {
- revert_creds(old_creds);
- put_cred(new_creds);
- }
-
- return temp;
-}
-
static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp)
{
+ struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb);
int err;
/*
@@ -515,12 +505,13 @@
upperpath.dentry = temp;
ovl_path_lowerdata(c->dentry, &datapath);
- err = ovl_copy_up_data(&datapath, &upperpath, c->stat.size);
+ err = ovl_copy_up_data(ofs, &datapath, &upperpath,
+ c->stat.size);
if (err)
return err;
}
- err = ovl_copy_xattr(c->lowerpath.dentry, temp);
+ err = ovl_copy_xattr(c->dentry->d_sb, c->lowerpath.dentry, temp);
if (err)
return err;
@@ -545,7 +536,7 @@
}
inode_lock(temp->d_inode);
- if (c->metacopy)
+ if (S_ISREG(c->stat.mode))
err = ovl_set_size(temp, &c->stat);
if (!err)
err = ovl_set_attr(temp, &c->stat);
@@ -554,51 +545,149 @@
return err;
}
-static int ovl_copy_up_locked(struct ovl_copy_up_ctx *c)
+struct ovl_cu_creds {
+ const struct cred *old;
+ struct cred *new;
+};
+
+static int ovl_prep_cu_creds(struct dentry *dentry, struct ovl_cu_creds *cc)
{
- struct inode *udir = c->destdir->d_inode;
- struct inode *inode;
- struct dentry *newdentry = NULL;
- struct dentry *temp;
int err;
- temp = ovl_get_tmpfile(c);
+ cc->old = cc->new = NULL;
+ err = security_inode_copy_up(dentry, &cc->new);
+ if (err < 0)
+ return err;
+
+ if (cc->new)
+ cc->old = override_creds(cc->new);
+
+ return 0;
+}
+
+static void ovl_revert_cu_creds(struct ovl_cu_creds *cc)
+{
+ if (cc->new) {
+ revert_creds(cc->old);
+ put_cred(cc->new);
+ }
+}
+
+/*
+ * Copyup using workdir to prepare temp file. Used when copying up directories,
+ * special files or when upper fs doesn't support O_TMPFILE.
+ */
+static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
+{
+ struct inode *inode;
+ struct inode *udir = d_inode(c->destdir), *wdir = d_inode(c->workdir);
+ struct dentry *temp, *upper;
+ struct ovl_cu_creds cc;
+ int err;
+ struct ovl_cattr cattr = {
+ /* Can't properly set mode on creation because of the umask */
+ .mode = c->stat.mode & S_IFMT,
+ .rdev = c->stat.rdev,
+ .link = c->link
+ };
+
+ /* workdir and destdir could be the same when copying up to indexdir */
+ err = -EIO;
+ if (lock_rename(c->workdir, c->destdir) != NULL)
+ goto unlock;
+
+ err = ovl_prep_cu_creds(c->dentry, &cc);
+ if (err)
+ goto unlock;
+
+ temp = ovl_create_temp(c->workdir, &cattr);
+ ovl_revert_cu_creds(&cc);
+
+ err = PTR_ERR(temp);
+ if (IS_ERR(temp))
+ goto unlock;
+
+ err = ovl_copy_up_inode(c, temp);
+ if (err)
+ goto cleanup;
+
+ if (S_ISDIR(c->stat.mode) && c->indexed) {
+ err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp);
+ if (err)
+ goto cleanup;
+ }
+
+ upper = lookup_one_len(c->destname.name, c->destdir, c->destname.len);
+ err = PTR_ERR(upper);
+ if (IS_ERR(upper))
+ goto cleanup;
+
+ err = ovl_do_rename(wdir, temp, udir, upper, 0);
+ dput(upper);
+ if (err)
+ goto cleanup;
+
+ if (!c->metacopy)
+ ovl_set_upperdata(d_inode(c->dentry));
+ inode = d_inode(c->dentry);
+ ovl_inode_update(inode, temp);
+ if (S_ISDIR(inode->i_mode))
+ ovl_set_flag(OVL_WHITEOUTS, inode);
+unlock:
+ unlock_rename(c->workdir, c->destdir);
+
+ return err;
+
+cleanup:
+ ovl_cleanup(wdir, temp);
+ dput(temp);
+ goto unlock;
+}
+
+/* Copyup using O_TMPFILE which does not require cross dir locking */
+static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
+{
+ struct inode *udir = d_inode(c->destdir);
+ struct dentry *temp, *upper;
+ struct ovl_cu_creds cc;
+ int err;
+
+ err = ovl_prep_cu_creds(c->dentry, &cc);
+ if (err)
+ return err;
+
+ temp = ovl_do_tmpfile(c->workdir, c->stat.mode);
+ ovl_revert_cu_creds(&cc);
+
if (IS_ERR(temp))
return PTR_ERR(temp);
err = ovl_copy_up_inode(c, temp);
if (err)
- goto out;
+ goto out_dput;
- if (S_ISDIR(c->stat.mode) && c->indexed) {
- err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp);
- if (err)
- goto out;
- }
+ inode_lock_nested(udir, I_MUTEX_PARENT);
- if (c->tmpfile) {
- inode_lock_nested(udir, I_MUTEX_PARENT);
- err = ovl_install_temp(c, temp, &newdentry);
- inode_unlock(udir);
- } else {
- err = ovl_install_temp(c, temp, &newdentry);
+ upper = lookup_one_len(c->destname.name, c->destdir, c->destname.len);
+ err = PTR_ERR(upper);
+ if (!IS_ERR(upper)) {
+ err = ovl_do_link(temp, udir, upper);
+ dput(upper);
}
+ inode_unlock(udir);
+
if (err)
- goto out;
+ goto out_dput;
if (!c->metacopy)
ovl_set_upperdata(d_inode(c->dentry));
- inode = d_inode(c->dentry);
- ovl_inode_update(inode, newdentry);
- if (S_ISDIR(inode->i_mode))
- ovl_set_flag(OVL_WHITEOUTS, inode);
+ ovl_inode_update(d_inode(c->dentry), temp);
-out:
- if (err && !c->tmpfile)
- ovl_cleanup(d_inode(c->workdir), temp);
+ return 0;
+
+out_dput:
dput(temp);
return err;
-
}
/*
@@ -652,18 +741,10 @@
}
/* Should we copyup with O_TMPFILE or with workdir? */
- if (S_ISREG(c->stat.mode) && ofs->tmpfile) {
- c->tmpfile = true;
- err = ovl_copy_up_locked(c);
- } else {
- err = ovl_lock_rename_workdir(c->workdir, c->destdir);
- if (!err) {
- err = ovl_copy_up_locked(c);
- unlock_rename(c->workdir, c->destdir);
- }
- }
-
-
+ if (S_ISREG(c->stat.mode) && ofs->tmpfile)
+ err = ovl_copy_up_tmpfile(c);
+ else
+ err = ovl_copy_up_workdir(c);
if (err)
goto out;
@@ -682,6 +763,7 @@
inode_unlock(udir);
ovl_dentry_set_upper_alias(c->dentry);
+ ovl_dentry_update_reval(c->dentry, ovl_dentry_upper(c->dentry));
}
out:
@@ -707,13 +789,37 @@
return true;
}
+static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value)
+{
+ ssize_t res;
+ char *buf;
+
+ res = vfs_getxattr(dentry, name, NULL, 0);
+ if (res == -ENODATA || res == -EOPNOTSUPP)
+ res = 0;
+
+ if (res > 0) {
+ buf = kzalloc(res, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ res = vfs_getxattr(dentry, name, buf, res);
+ if (res < 0)
+ kfree(buf);
+ else
+ *value = buf;
+ }
+ return res;
+}
+
/* Copy up data of an inode which was copied up metadata only in the past. */
static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c)
{
+ struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb);
struct path upperpath, datapath;
int err;
char *capability = NULL;
- ssize_t uninitialized_var(cap_size);
+ ssize_t cap_size;
ovl_path_upper(c->dentry, &upperpath);
if (WARN_ON(upperpath.dentry == NULL))
@@ -725,12 +831,12 @@
if (c->stat.size) {
err = cap_size = ovl_getxattr(upperpath.dentry, XATTR_NAME_CAPS,
- &capability, 0);
- if (err < 0 && err != -ENODATA)
+ &capability);
+ if (cap_size < 0)
goto out;
}
- err = ovl_copy_up_data(&datapath, &upperpath, c->stat.size);
+ err = ovl_copy_up_data(ofs, &datapath, &upperpath, c->stat.size);
if (err)
goto out_free;
@@ -739,14 +845,14 @@
* don't want that to happen for normal copy-up operation.
*/
if (capability) {
- err = ovl_do_setxattr(upperpath.dentry, XATTR_NAME_CAPS,
- capability, cap_size, 0);
+ err = vfs_setxattr(upperpath.dentry, XATTR_NAME_CAPS,
+ capability, cap_size, 0);
if (err)
goto out_free;
}
- err = vfs_removexattr(upperpath.dentry, OVL_XATTR_METACOPY);
+ err = ovl_do_removexattr(ofs, upperpath.dentry, OVL_XATTR_METACOPY);
if (err)
goto out_free;
@@ -821,7 +927,7 @@
return err;
}
-int ovl_copy_up_flags(struct dentry *dentry, int flags)
+static int ovl_copy_up_flags(struct dentry *dentry, int flags)
{
int err = 0;
const struct cred *old_cred;
@@ -860,7 +966,7 @@
dput(parent);
dput(next);
}
- ovl_revert_creds(old_cred);
+ ovl_revert_creds(dentry->d_sb, old_cred);
return err;
}
--
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