* Re: [CFT] vfs.git #work.cifs
2021-04-15 20:42 ` Al Viro
@ 2021-04-15 22:35 ` Steve French
2021-04-16 0:28 ` Al Viro
0 siblings, 1 reply; 8+ messages in thread
From: Steve French @ 2021-04-15 22:35 UTC (permalink / raw)
To: Al Viro; +Cc: CIFS
[-- Attachment #1: Type: text/plain, Size: 1725 bytes --]
Your series is currently in cifs-2.6.git for-next, and it is less
risky if we keep it there, in my tree (assuming your series is up to
date). I have attached the version I have merged, which presumably is
still the latest unless you have changed it in the last week. As
mentioned earlier, I may touch related code if I revisit the WIP patch
I had to move the conversion of "/" to "\" (depending on server type),
later ie when the conversion (e.g. to Unicode, the UCS-2 on the wire
format) is done, rather than earlier (when full path is build from the
dentries). The seven from your branch also can be seen starting at
commit (in the cifs for-next branch that linux-next pulls from)
https://git.samba.org/?p=sfrench/cifs-2.6.git;a=commit;h=57704d22e55b9f49e797fe19bb6b5b5b429beb58
If you have updated versions let me know.
On Thu, Apr 15, 2021 at 3:42 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
>
> On Fri, Apr 09, 2021 at 08:36:24PM -0500, Steve French wrote:
> > Your series passed an all Azure test group
> > http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com/#/builders/11/builds/20
> > (with additional patches) and the main test group (with your 7 and
> > Ronnie's finsert/fcollapse)
> > http://smb3-test-rhel-75.southcentralus.cloudapp.azure.com/#/builders/11/builds/20
> > which tests to the wider variety of server and target server fs types.
>
> OK... I can
> * rebase it on top of your tree and repost the patches for applying
> to cifs.git
> * rebase it and send you a pull request
> * send you a pull request on the branch as-is
> * keep it in vfs.git and send a pull request to Linus when window
> opens.
>
> Which variant would you prefer?
--
Thanks,
Steve
[-- Attachment #2: 0001-cifs-don-t-cargo-cult-strndup.patch --]
[-- Type: text/x-patch, Size: 7312 bytes --]
From 57704d22e55b9f49e797fe19bb6b5b5b429beb58 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 5 Mar 2021 15:02:34 -0500
Subject: [PATCH 1/8] cifs: don't cargo-cult strndup()
strndup(s, strlen(s)) is a highly unidiomatic way to spell strdup(s);
it's *NOT* safer in any way, since strlen() is just as sensitive to
NUL-termination as strdup() is.
strndup() is for situations when you need a copy of a known-sized
substring, not a magic security juju to drive the bad spirits away.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifs_dfs_ref.c | 2 +-
fs/cifs/connect.c | 9 +++------
fs/cifs/dfs_cache.c | 18 +++++++++---------
fs/cifs/fs_context.c | 2 +-
fs/cifs/misc.c | 2 +-
fs/cifs/smb1ops.c | 4 +---
fs/cifs/unc.c | 4 +---
7 files changed, 17 insertions(+), 24 deletions(-)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 6b1ce4efb591..ecee2864972d 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -270,7 +270,7 @@ static struct vfsmount *cifs_dfs_do_mount(struct dentry *mntpt,
char *mountdata;
char *devname;
- devname = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
+ devname = kstrdup(fullpath, GFP_KERNEL);
if (!devname)
return ERR_PTR(-ENOMEM);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 35dbb9c836ea..121d8b4535b0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1778,9 +1778,7 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
* for the request.
*/
if (is_domain && ses->domainName) {
- ctx->domainname = kstrndup(ses->domainName,
- strlen(ses->domainName),
- GFP_KERNEL);
+ ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
if (!ctx->domainname) {
cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
len);
@@ -3411,8 +3409,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
goto error;
}
/* Save mount options */
- mntdata = kstrndup(cifs_sb->ctx->mount_options,
- strlen(cifs_sb->ctx->mount_options), GFP_KERNEL);
+ mntdata = kstrdup(cifs_sb->ctx->mount_options, GFP_KERNEL);
if (!mntdata) {
rc = -ENOMEM;
goto error;
@@ -3485,7 +3482,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
* links, the prefix path is included in both and may be changed during reconnect. See
* cifs_tree_connect().
*/
- cifs_sb->origin_fullpath = kstrndup(full_path, strlen(full_path), GFP_KERNEL);
+ cifs_sb->origin_fullpath = kstrdup(full_path, GFP_KERNEL);
if (!cifs_sb->origin_fullpath) {
rc = -ENOMEM;
goto error;
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index 098b4bc8da59..e4617ccf0a23 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -89,7 +89,7 @@ static int get_normalized_path(const char *path, char **npath)
if (*path == '\\') {
*npath = (char *)path;
} else {
- *npath = kstrndup(path, strlen(path), GFP_KERNEL);
+ *npath = kstrdup(path, GFP_KERNEL);
if (!*npath)
return -ENOMEM;
convert_delimiter(*npath, '\\');
@@ -358,7 +358,7 @@ static struct cache_dfs_tgt *alloc_target(const char *name, int path_consumed)
t = kmalloc(sizeof(*t), GFP_ATOMIC);
if (!t)
return ERR_PTR(-ENOMEM);
- t->name = kstrndup(name, strlen(name), GFP_ATOMIC);
+ t->name = kstrdup(name, GFP_ATOMIC);
if (!t->name) {
kfree(t);
return ERR_PTR(-ENOMEM);
@@ -419,7 +419,7 @@ static struct cache_entry *alloc_cache_entry(const char *path,
if (!ce)
return ERR_PTR(-ENOMEM);
- ce->path = kstrndup(path, strlen(path), GFP_KERNEL);
+ ce->path = kstrdup(path, GFP_KERNEL);
if (!ce->path) {
kmem_cache_free(cache_slab, ce);
return ERR_PTR(-ENOMEM);
@@ -531,7 +531,7 @@ static struct cache_entry *lookup_cache_entry(const char *path, unsigned int *ha
char *s, *e;
char sep;
- npath = kstrndup(path, strlen(path), GFP_KERNEL);
+ npath = kstrdup(path, GFP_KERNEL);
if (!npath)
return ERR_PTR(-ENOMEM);
@@ -641,7 +641,7 @@ static int __update_cache_entry(const char *path,
if (ce->tgthint) {
s = ce->tgthint->name;
- th = kstrndup(s, strlen(s), GFP_ATOMIC);
+ th = kstrdup(s, GFP_ATOMIC);
if (!th)
return -ENOMEM;
}
@@ -786,11 +786,11 @@ static int setup_referral(const char *path, struct cache_entry *ce,
memset(ref, 0, sizeof(*ref));
- ref->path_name = kstrndup(path, strlen(path), GFP_ATOMIC);
+ ref->path_name = kstrdup(path, GFP_ATOMIC);
if (!ref->path_name)
return -ENOMEM;
- ref->node_name = kstrndup(target, strlen(target), GFP_ATOMIC);
+ ref->node_name = kstrdup(target, GFP_ATOMIC);
if (!ref->node_name) {
rc = -ENOMEM;
goto err_free_path;
@@ -828,7 +828,7 @@ static int get_targets(struct cache_entry *ce, struct dfs_cache_tgt_list *tl)
goto err_free_it;
}
- it->it_name = kstrndup(t->name, strlen(t->name), GFP_ATOMIC);
+ it->it_name = kstrdup(t->name, GFP_ATOMIC);
if (!it->it_name) {
kfree(it);
rc = -ENOMEM;
@@ -1166,7 +1166,7 @@ int dfs_cache_add_vol(char *mntdata, struct smb3_fs_context *ctx, const char *fu
if (!vi)
return -ENOMEM;
- vi->fullpath = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
+ vi->fullpath = kstrdup(fullpath, GFP_KERNEL);
if (!vi->fullpath) {
rc = -ENOMEM;
goto err_free_vi;
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 78889024a7ed..7652f73e1bcc 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -430,7 +430,7 @@ int smb3_parse_opt(const char *options, const char *key, char **val)
if (nval == p)
continue;
*nval++ = 0;
- *val = kstrndup(nval, strlen(nval), GFP_KERNEL);
+ *val = kstrdup(nval, GFP_KERNEL);
rc = !*val ? -ENOMEM : 0;
goto out;
}
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 82e176720ca6..c15a90e422be 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1180,7 +1180,7 @@ int update_super_prepath(struct cifs_tcon *tcon, char *prefix)
kfree(cifs_sb->prepath);
if (prefix && *prefix) {
- cifs_sb->prepath = kstrndup(prefix, strlen(prefix), GFP_ATOMIC);
+ cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
if (!cifs_sb->prepath) {
rc = -ENOMEM;
goto out;
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index e31b939e628c..85fa254c7a6b 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -926,9 +926,7 @@ cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
0);
if (!rc) {
- *symlinkinfo = kstrndup(referral.node_name,
- strlen(referral.node_name),
- GFP_KERNEL);
+ *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL);
free_dfs_info_param(&referral);
if (!*symlinkinfo)
rc = -ENOMEM;
diff --git a/fs/cifs/unc.c b/fs/cifs/unc.c
index 394aa00cea40..f6fc5e343ea4 100644
--- a/fs/cifs/unc.c
+++ b/fs/cifs/unc.c
@@ -50,7 +50,6 @@ char *extract_sharename(const char *unc)
{
const char *src;
char *delim, *dst;
- int len;
/* skip double chars at the beginning */
src = unc + 2;
@@ -60,10 +59,9 @@ char *extract_sharename(const char *unc)
if (!delim)
return ERR_PTR(-EINVAL);
delim++;
- len = strlen(delim);
/* caller has to free the memory */
- dst = kstrndup(delim, len, GFP_KERNEL);
+ dst = kstrdup(delim, GFP_KERNEL);
if (!dst)
return ERR_PTR(-ENOMEM);
--
2.27.0
[-- Attachment #3: 0004-cifs-constify-pathname-arguments-in-a-bunch-of-helpe.patch --]
[-- Type: text/x-patch, Size: 4821 bytes --]
From 1f9aeb1554a719ef72f84853f8af781031cf68e1 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Mar 2021 15:44:05 -0400
Subject: [PATCH 4/8] cifs: constify pathname arguments in a bunch of helpers
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifsproto.h | 4 ++--
fs/cifs/file.c | 4 ++--
fs/cifs/inode.c | 4 ++--
fs/cifs/readdir.c | 4 ++--
fs/cifs/xattr.c | 4 ++--
5 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 10c84a8159d7..a46594c79e75 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -184,7 +184,7 @@ extern struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid,
struct file *file,
struct tcon_link *tlink,
__u32 oplock);
-extern int cifs_posix_open(char *full_path, struct inode **inode,
+extern int cifs_posix_open(const char *full_path, struct inode **inode,
struct super_block *sb, int mode,
unsigned int f_flags, __u32 *oplock, __u16 *netfid,
unsigned int xid);
@@ -207,7 +207,7 @@ extern int cifs_get_inode_info_unix(struct inode **pinode,
const unsigned char *search_path,
struct super_block *sb, unsigned int xid);
extern int cifs_set_file_info(struct inode *inode, struct iattr *attrs,
- unsigned int xid, char *full_path, __u32 dosattr);
+ unsigned int xid, const char *full_path, __u32 dosattr);
extern int cifs_rename_pending_delete(const char *full_path,
struct dentry *dentry,
const unsigned int xid);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 042e24aad410..d903709d61bd 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -112,7 +112,7 @@ static inline int cifs_get_disposition(unsigned int flags)
return FILE_OPEN;
}
-int cifs_posix_open(char *full_path, struct inode **pinode,
+int cifs_posix_open(const char *full_path, struct inode **pinode,
struct super_block *sb, int mode, unsigned int f_flags,
__u32 *poplock, __u16 *pnetfid, unsigned int xid)
{
@@ -175,7 +175,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
}
static int
-cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
+cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock,
struct cifs_fid *fid, unsigned int xid)
{
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 2a73ae04b741..c6e7bb4a1876 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1408,7 +1408,7 @@ struct inode *cifs_root_iget(struct super_block *sb)
int
cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
- char *full_path, __u32 dosattr)
+ const char *full_path, __u32 dosattr)
{
bool set_time = false;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -2522,7 +2522,7 @@ void cifs_setsize(struct inode *inode, loff_t offset)
static int
cifs_set_file_size(struct inode *inode, struct iattr *attrs,
- unsigned int xid, char *full_path)
+ unsigned int xid, const char *full_path)
{
int rc;
struct cifsFileInfo *open_file;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 80bf4c6f4c7b..7225b2cae3e6 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -384,7 +384,7 @@ int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
static int
initiate_cifs_search(const unsigned int xid, struct file *file,
- char *full_path)
+ const char *full_path)
{
__u16 search_flags;
int rc = 0;
@@ -704,7 +704,7 @@ static int cifs_save_resume_key(const char *current_entry,
*/
static int
find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
- struct file *file, char *full_path,
+ struct file *file, const char *full_path,
char **current_entry, int *num_to_ret)
{
__u16 search_flags;
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 41a611e76bb7..bac05dd6c5b3 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -53,7 +53,7 @@ enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
- struct inode *inode, char *full_path,
+ struct inode *inode, const char *full_path,
const void *value, size_t size)
{
ssize_t rc = -EOPNOTSUPP;
@@ -77,7 +77,7 @@ static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
}
static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
- struct inode *inode, char *full_path,
+ struct inode *inode, const char *full_path,
const void *value, size_t size)
{
ssize_t rc = -EOPNOTSUPP;
--
2.27.0
[-- Attachment #4: 0003-cifs-constify-path-argument-of-make_node.patch --]
[-- Type: text/x-patch, Size: 1914 bytes --]
From 8305f05c329f3e83b80a76b054c1ab7e49bc6cc4 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Mar 2021 01:38:53 -0400
Subject: [PATCH 3/8] cifs: constify path argument of ->make_node()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifsglob.h | 2 +-
fs/cifs/smb1ops.c | 2 +-
fs/cifs/smb2ops.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 18a5505a506c..034b919f091d 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -495,7 +495,7 @@ struct smb_version_operations {
struct inode *inode,
struct dentry *dentry,
struct cifs_tcon *tcon,
- char *full_path,
+ const char *full_path,
umode_t mode,
dev_t device_number);
/* version specific fiemap implementation */
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 85fa254c7a6b..3b83839fc2c2 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1025,7 +1025,7 @@ cifs_can_echo(struct TCP_Server_Info *server)
static int
cifs_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
- char *full_path, umode_t mode, dev_t dev)
+ const char *full_path, umode_t mode, dev_t dev)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct inode *newinode = NULL;
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f703204fb185..81b1e0eca9b9 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -4968,7 +4968,7 @@ smb2_next_header(char *buf)
static int
smb2_make_node(unsigned int xid, struct inode *inode,
struct dentry *dentry, struct cifs_tcon *tcon,
- char *full_path, umode_t mode, dev_t dev)
+ const char *full_path, umode_t mode, dev_t dev)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
int rc = -EPERM;
--
2.27.0
[-- Attachment #5: 0002-cifs-constify-get_normalized_path-properly.patch --]
[-- Type: text/x-patch, Size: 3209 bytes --]
From f713b7122bf320633905308803371afd35200fdc Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Mar 2021 01:03:34 -0400
Subject: [PATCH 2/8] cifs: constify get_normalized_path() properly
As it is, it takes const char * and, in some cases, stores it in
caller's variable that is plain char *. Fortunately, none of the
callers actually proceeded to modify the string via now-non-const
alias, but that's trouble waiting to happen.
It's easy to do properly, anyway...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/dfs_cache.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index e4617ccf0a23..b1fa30fefe1f 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -81,23 +81,24 @@ static void refresh_cache_worker(struct work_struct *work);
static DECLARE_DELAYED_WORK(refresh_task, refresh_cache_worker);
-static int get_normalized_path(const char *path, char **npath)
+static int get_normalized_path(const char *path, const char **npath)
{
if (!path || strlen(path) < 3 || (*path != '\\' && *path != '/'))
return -EINVAL;
if (*path == '\\') {
- *npath = (char *)path;
+ *npath = path;
} else {
- *npath = kstrdup(path, GFP_KERNEL);
- if (!*npath)
+ char *s = kstrdup(path, GFP_KERNEL);
+ if (!s)
return -ENOMEM;
- convert_delimiter(*npath, '\\');
+ convert_delimiter(s, '\\');
+ *npath = s;
}
return 0;
}
-static inline void free_normalized_path(const char *path, char *npath)
+static inline void free_normalized_path(const char *path, const char *npath)
{
if (path != npath)
kfree(npath);
@@ -882,7 +883,7 @@ int dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
struct dfs_cache_tgt_list *tgt_list)
{
int rc;
- char *npath;
+ const char *npath;
struct cache_entry *ce;
rc = get_normalized_path(path, &npath);
@@ -936,7 +937,7 @@ int dfs_cache_noreq_find(const char *path, struct dfs_info3_param *ref,
struct dfs_cache_tgt_list *tgt_list)
{
int rc;
- char *npath;
+ const char *npath;
struct cache_entry *ce;
rc = get_normalized_path(path, &npath);
@@ -991,7 +992,7 @@ int dfs_cache_update_tgthint(const unsigned int xid, struct cifs_ses *ses,
const struct dfs_cache_tgt_iterator *it)
{
int rc;
- char *npath;
+ const char *npath;
struct cache_entry *ce;
struct cache_dfs_tgt *t;
@@ -1053,7 +1054,7 @@ int dfs_cache_noreq_update_tgthint(const char *path,
const struct dfs_cache_tgt_iterator *it)
{
int rc;
- char *npath;
+ const char *npath;
struct cache_entry *ce;
struct cache_dfs_tgt *t;
@@ -1111,7 +1112,7 @@ int dfs_cache_get_tgt_referral(const char *path,
struct dfs_info3_param *ref)
{
int rc;
- char *npath;
+ const char *npath;
struct cache_entry *ce;
if (!it || !ref)
@@ -1484,7 +1485,7 @@ static int refresh_tcon(struct vol_info *vi, struct cifs_tcon *tcon)
{
int rc = 0;
unsigned int xid;
- char *path, *npath;
+ const char *path, *npath;
struct cache_entry *ce;
struct cifs_ses *root_ses = NULL, *ses;
struct dfs_info3_param *refs = NULL;
--
2.27.0
[-- Attachment #6: 0007-cifs-switch-build_path_from_dentry-to-using-dentry_p.patch --]
[-- Type: text/x-patch, Size: 4288 bytes --]
From e55f574dc7492006705cabf81daf9c1e40ecea25 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 5 Mar 2021 21:53:48 -0500
Subject: [PATCH 7/8] cifs: switch build_path_from_dentry() to using
dentry_path_raw()
The cost is that we might need to flip '/' to '\\' in more than
just the prefix. Needs profiling, but I suspect that we won't
get slowdown on that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/dir.c | 85 ++++++++++++++-------------------------------------
1 file changed, 23 insertions(+), 62 deletions(-)
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 6e855f004f50..03afad8b24af 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -93,20 +93,16 @@ char *
build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
bool prefix)
{
- struct dentry *temp;
- int namelen;
int dfsplen;
int pplen = 0;
- char *full_path = page;
- char dirsep;
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
- unsigned seq;
+ char dirsep = CIFS_DIR_SEP(cifs_sb);
+ char *s;
if (unlikely(!page))
return ERR_PTR(-ENOMEM);
- dirsep = CIFS_DIR_SEP(cifs_sb);
if (prefix)
dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
else
@@ -115,74 +111,39 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
-cifs_bp_rename_retry:
- namelen = dfsplen + pplen;
- seq = read_seqbegin(&rename_lock);
- rcu_read_lock();
- for (temp = direntry; !IS_ROOT(temp);) {
- namelen += (1 + temp->d_name.len);
- temp = temp->d_parent;
- }
- rcu_read_unlock();
-
- if (namelen >= PAGE_SIZE)
+ s = dentry_path_raw(direntry, page, PAGE_SIZE);
+ if (IS_ERR(s))
+ return s;
+ if (!s[1]) // for root we want "", not "/"
+ s++;
+ if (s < (char *)page + pplen + dfsplen)
return ERR_PTR(-ENAMETOOLONG);
-
- full_path[namelen] = 0; /* trailing null */
- rcu_read_lock();
- for (temp = direntry; !IS_ROOT(temp);) {
- spin_lock(&temp->d_lock);
- namelen -= 1 + temp->d_name.len;
- if (namelen < 0) {
- spin_unlock(&temp->d_lock);
- break;
- } else {
- full_path[namelen] = dirsep;
- strncpy(full_path + namelen + 1, temp->d_name.name,
- temp->d_name.len);
- cifs_dbg(FYI, "name: %s\n", full_path + namelen);
- }
- spin_unlock(&temp->d_lock);
- temp = temp->d_parent;
- }
- rcu_read_unlock();
- if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
- cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n",
- namelen, dfsplen);
- /* presumably this is only possible if racing with a rename
- of one of the parent directories (we can not lock the dentries
- above us to prevent this, but retrying should be harmless) */
- goto cifs_bp_rename_retry;
- }
- /* DIR_SEP already set for byte 0 / vs \ but not for
- subsequent slashes in prepath which currently must
- be entered the right way - not sure if there is an alternative
- since the '\' is a valid posix character so we can not switch
- those safely to '/' if any are found in the middle of the prepath */
- /* BB test paths to Windows with '/' in the midst of prepath */
-
if (pplen) {
- int i;
-
cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
- memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1);
- full_path[dfsplen] = dirsep;
- for (i = 0; i < pplen-1; i++)
- if (full_path[dfsplen+1+i] == '/')
- full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb);
+ s -= pplen;
+ memcpy(s + 1, cifs_sb->prepath, pplen - 1);
+ *s = '/';
}
+ if (dirsep != '/') {
+ /* BB test paths to Windows with '/' in the midst of prepath */
+ char *p;
+ for (p = s; *p; p++)
+ if (*p == '/')
+ *p = dirsep;
+ }
if (dfsplen) {
- strncpy(full_path, tcon->treeName, dfsplen);
+ s -= dfsplen;
+ memcpy(s, tcon->treeName, dfsplen);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
int i;
for (i = 0; i < dfsplen; i++) {
- if (full_path[i] == '\\')
- full_path[i] = '/';
+ if (s[i] == '\\')
+ s[i] = '/';
}
}
}
- return full_path;
+ return s;
}
/*
--
2.27.0
[-- Attachment #7: 0005-cifs-make-build_path_from_dentry-return-const-char.patch --]
[-- Type: text/x-patch, Size: 9664 bytes --]
From 142d8ba820aed468d231012679ade317b7326c8b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 18 Mar 2021 15:47:35 -0400
Subject: [PATCH 5/8] cifs: make build_path_from_dentry() return const char *
... and adjust the callers.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifsproto.h | 2 +-
fs/cifs/dir.c | 8 ++++----
fs/cifs/file.c | 8 ++++----
fs/cifs/inode.c | 16 ++++++++--------
fs/cifs/ioctl.c | 2 +-
fs/cifs/link.c | 8 ++++----
fs/cifs/readdir.c | 2 +-
fs/cifs/smb2ops.c | 2 +-
fs/cifs/xattr.c | 6 +++---
9 files changed, 27 insertions(+), 27 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index a46594c79e75..ed6ea0c59cb9 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -69,7 +69,7 @@ extern int init_cifs_idmap(void);
extern void exit_cifs_idmap(void);
extern int init_cifs_spnego(void);
extern void exit_cifs_spnego(void);
-extern char *build_path_from_dentry(struct dentry *);
+extern const char *build_path_from_dentry(struct dentry *);
extern char *build_path_from_dentry_optional_prefix(struct dentry *direntry,
bool prefix);
extern char *cifs_build_path_to_root(struct smb3_fs_context *ctx,
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index a3fb81e0ba17..01e26f811885 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -78,7 +78,7 @@ cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_s
}
/* Note: caller must free return buffer */
-char *
+const char *
build_path_from_dentry(struct dentry *direntry)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
@@ -233,7 +233,7 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
int desired_access;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = tlink_tcon(tlink);
- char *full_path = NULL;
+ const char *full_path = NULL;
FILE_ALL_INFO *buf = NULL;
struct inode *newinode = NULL;
int disposition;
@@ -619,7 +619,7 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
- char *full_path = NULL;
+ const char *full_path = NULL;
if (!old_valid_dev(device_number))
return -EINVAL;
@@ -660,7 +660,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
struct inode *newInode = NULL;
- char *full_path = NULL;
+ const char *full_path = NULL;
xid = get_xid();
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index d903709d61bd..af49b3937e15 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -530,7 +530,7 @@ int cifs_open(struct inode *inode, struct file *file)
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifsFileInfo *cfile = NULL;
- char *full_path = NULL;
+ const char *full_path = NULL;
bool posix_open_ok = false;
struct cifs_fid fid;
struct cifs_pending_open open;
@@ -689,7 +689,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
struct TCP_Server_Info *server;
struct cifsInodeInfo *cinode;
struct inode *inode;
- char *full_path = NULL;
+ const char *full_path = NULL;
int desired_access;
int disposition = FILE_OPEN;
int create_options = CREATE_NOT_DIR;
@@ -2072,7 +2072,7 @@ cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct cifsInodeInfo *cinode;
- char *full_path;
+ const char *full_path;
*ret_file = NULL;
@@ -2107,7 +2107,7 @@ cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct cifsInodeInfo *cinode;
- char *full_path;
+ const char *full_path;
*ret_file = NULL;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index c6e7bb4a1876..0b29893f40b7 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1609,7 +1609,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
unsigned int xid;
- char *full_path = NULL;
+ const char *full_path = NULL;
struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_inode;
struct super_block *sb = dir->i_sb;
@@ -1866,7 +1866,7 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
- char *full_path;
+ const char *full_path;
cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
mode, inode);
@@ -1938,7 +1938,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
- char *full_path = NULL;
+ const char *full_path = NULL;
struct cifsInodeInfo *cifsInode;
cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
@@ -2072,8 +2072,8 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
struct dentry *source_dentry, struct inode *target_dir,
struct dentry *target_dentry, unsigned int flags)
{
- char *from_name = NULL;
- char *to_name = NULL;
+ const char *from_name = NULL;
+ const char *to_name = NULL;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@@ -2317,7 +2317,7 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
int rc = 0;
struct inode *inode = d_inode(dentry);
struct super_block *sb = dentry->d_sb;
- char *full_path = NULL;
+ const char *full_path = NULL;
int count = 0;
if (inode == NULL)
@@ -2613,7 +2613,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
int rc;
unsigned int xid;
- char *full_path = NULL;
+ const char *full_path = NULL;
struct inode *inode = d_inode(direntry);
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -2764,7 +2764,7 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
- char *full_path = NULL;
+ const char *full_path = NULL;
int rc = -EACCES;
__u32 dosattr = 0;
__u64 mode = NO_CHANGE_64;
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index dcde44ff6cf9..aba573dd86ac 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -42,7 +42,7 @@ static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct dentry *dentry = filep->f_path.dentry;
- unsigned char *path;
+ const unsigned char *path;
__le16 *utf16_path = NULL, root_path;
int rc = 0;
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 7c5878a645d9..18e0e31a6d39 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -510,8 +510,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
{
int rc = -EACCES;
unsigned int xid;
- char *from_name = NULL;
- char *to_name = NULL;
+ const char *from_name = NULL;
+ const char *to_name = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@@ -600,7 +600,7 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
{
int rc = -ENOMEM;
unsigned int xid;
- char *full_path = NULL;
+ const char *full_path = NULL;
char *target_path = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = NULL;
@@ -669,7 +669,7 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
- char *full_path = NULL;
+ const char *full_path = NULL;
struct inode *newinode = NULL;
xid = get_xid();
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 7225b2cae3e6..67c3177a1fda 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -942,7 +942,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
char *tmp_buf = NULL;
char *end_of_smb;
unsigned int max_len;
- char *full_path = NULL;
+ const char *full_path = NULL;
xid = get_xid();
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 81b1e0eca9b9..30cfbebdd8b4 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2221,7 +2221,7 @@ smb3_notify(const unsigned int xid, struct file *pfile,
struct cifs_open_parms oparms;
struct cifs_fid fid;
struct cifs_tcon *tcon;
- unsigned char *path = NULL;
+ const unsigned char *path = NULL;
__le16 *utf16_path = NULL;
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
int rc = 0;
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index bac05dd6c5b3..0195a9be3d28 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -112,7 +112,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
- char *full_path;
+ const char *full_path;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -297,7 +297,7 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
- char *full_path;
+ const char *full_path;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -414,7 +414,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
- char *full_path;
+ const char *full_path;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
return -EOPNOTSUPP;
--
2.27.0
[-- Attachment #8: 0006-cifs-allocate-buffer-in-the-caller-of-build_path_fro.patch --]
[-- Type: text/x-patch, Size: 32141 bytes --]
From e594b0364f2f87b84cb64b1ebe6de433d7a156cc Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 5 Mar 2021 17:36:04 -0500
Subject: [PATCH 6/8] cifs: allocate buffer in the caller of
build_path_from_dentry()
build_path_from_dentry() open-codes dentry_path_raw(). The reason
we can't use dentry_path_raw() in there (and postprocess the
result as needed) is that the callers of build_path_from_dentry()
expect that the object to be freed on cleanup and the string to
be used are at the same address. That's painful, since the path
is naturally built end-to-beginning - we start at the leaf and
go through the ancestors, accumulating the pathname.
Life would be easier if we left the buffer allocation to callers.
It wouldn't be exact-sized buffer, but none of the callers keep
the result for long - it's always freed before the caller returns.
So there's no need to do exact-sized allocation; better use
__getname()/__putname(), same as we do for pathname arguments
of syscalls. What's more, there's no need to do allocation under
spinlocks, so GFP_ATOMIC is not needed.
Next patch will replace the open-coded dentry_path_raw() (in
build_path_from_dentry_optional_prefix()) with calling the real
thing. This patch only introduces wrappers for allocating/freeing
the buffers and switches to new calling conventions:
build_path_from_dentry(dentry, buf)
expects buf to be address of a page-sized object or NULL,
return value is a pathname built inside that buffer on success,
ERR_PTR(-ENOMEM) if buf is NULL and ERR_PTR(-ENAMETOOLONG) if
the pathname won't fit into page. Note that we don't need to
check for failure when allocating the buffer in the caller -
build_path_from_dentry() will do the right thing.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifs_dfs_ref.c | 12 +++--
fs/cifs/cifsproto.h | 15 +++++-
fs/cifs/dir.c | 69 ++++++++++++++-------------
fs/cifs/file.c | 75 ++++++++++++++---------------
fs/cifs/inode.c | 104 +++++++++++++++++++++--------------------
fs/cifs/ioctl.c | 11 +++--
fs/cifs/link.c | 46 +++++++++++-------
fs/cifs/readdir.c | 11 +++--
fs/cifs/smb2ops.c | 17 +++----
fs/cifs/xattr.c | 30 +++++++-----
10 files changed, 212 insertions(+), 178 deletions(-)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index ecee2864972d..c87c37cf2914 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -302,6 +302,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
struct cifs_sb_info *cifs_sb;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
+ void *page;
char *full_path, *root_path;
unsigned int xid;
int rc;
@@ -324,10 +325,13 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
goto cdda_exit;
}
+ page = alloc_dentry_path();
/* always use tree name prefix */
- full_path = build_path_from_dentry_optional_prefix(mntpt, true);
- if (full_path == NULL)
- goto cdda_exit;
+ full_path = build_path_from_dentry_optional_prefix(mntpt, page, true);
+ if (IS_ERR(full_path)) {
+ mnt = ERR_CAST(full_path);
+ goto free_full_path;
+ }
convert_delimiter(full_path, '\\');
@@ -385,7 +389,7 @@ static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
free_root_path:
kfree(root_path);
free_full_path:
- kfree(full_path);
+ free_dentry_path(page);
cdda_exit:
cifs_dbg(FYI, "leaving %s\n" , __func__);
return mnt;
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index ed6ea0c59cb9..c8faa3e82fe7 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -69,9 +69,20 @@ extern int init_cifs_idmap(void);
extern void exit_cifs_idmap(void);
extern int init_cifs_spnego(void);
extern void exit_cifs_spnego(void);
-extern const char *build_path_from_dentry(struct dentry *);
+extern const char *build_path_from_dentry(struct dentry *, void *);
extern char *build_path_from_dentry_optional_prefix(struct dentry *direntry,
- bool prefix);
+ void *page, bool prefix);
+static inline void *alloc_dentry_path(void)
+{
+ return __getname();
+}
+
+static inline void free_dentry_path(void *page)
+{
+ if (page)
+ __putname(page);
+}
+
extern char *cifs_build_path_to_root(struct smb3_fs_context *ctx,
struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon,
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 01e26f811885..6e855f004f50 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -79,29 +79,33 @@ cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_s
/* Note: caller must free return buffer */
const char *
-build_path_from_dentry(struct dentry *direntry)
+build_path_from_dentry(struct dentry *direntry, void *page)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
- return build_path_from_dentry_optional_prefix(direntry,
+ return build_path_from_dentry_optional_prefix(direntry, page,
prefix);
}
char *
-build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
+build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
+ bool prefix)
{
struct dentry *temp;
int namelen;
int dfsplen;
int pplen = 0;
- char *full_path;
+ char *full_path = page;
char dirsep;
struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
unsigned seq;
+ if (unlikely(!page))
+ return ERR_PTR(-ENOMEM);
+
dirsep = CIFS_DIR_SEP(cifs_sb);
if (prefix)
dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
@@ -118,17 +122,12 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
for (temp = direntry; !IS_ROOT(temp);) {
namelen += (1 + temp->d_name.len);
temp = temp->d_parent;
- if (temp == NULL) {
- cifs_dbg(VFS, "corrupt dentry\n");
- rcu_read_unlock();
- return NULL;
- }
}
rcu_read_unlock();
- full_path = kmalloc(namelen+1, GFP_ATOMIC);
- if (full_path == NULL)
- return full_path;
+ if (namelen >= PAGE_SIZE)
+ return ERR_PTR(-ENAMETOOLONG);
+
full_path[namelen] = 0; /* trailing null */
rcu_read_lock();
for (temp = direntry; !IS_ROOT(temp);) {
@@ -145,12 +144,6 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
}
spin_unlock(&temp->d_lock);
temp = temp->d_parent;
- if (temp == NULL) {
- cifs_dbg(VFS, "corrupt dentry\n");
- rcu_read_unlock();
- kfree(full_path);
- return NULL;
- }
}
rcu_read_unlock();
if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) {
@@ -159,7 +152,6 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix)
/* presumably this is only possible if racing with a rename
of one of the parent directories (we can not lock the dentries
above us to prevent this, but retrying should be harmless) */
- kfree(full_path);
goto cifs_bp_rename_retry;
}
/* DIR_SEP already set for byte 0 / vs \ but not for
@@ -233,7 +225,8 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
int desired_access;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_tcon *tcon = tlink_tcon(tlink);
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
FILE_ALL_INFO *buf = NULL;
struct inode *newinode = NULL;
int disposition;
@@ -244,9 +237,11 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
if (tcon->ses->server->oplocks)
*oplock = REQ_OPLOCK;
- full_path = build_path_from_dentry(direntry);
- if (!full_path)
- return -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
+ }
if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
@@ -448,7 +443,7 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
out:
kfree(buf);
- kfree(full_path);
+ free_dentry_path(page);
return rc;
out_err:
@@ -619,7 +614,8 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page;
if (!old_valid_dev(device_number))
return -EINVAL;
@@ -629,13 +625,13 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
if (IS_ERR(tlink))
return PTR_ERR(tlink);
+ page = alloc_dentry_path();
tcon = tlink_tcon(tlink);
-
xid = get_xid();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto mknod_out;
}
@@ -644,7 +640,7 @@ int cifs_mknod(struct user_namespace *mnt_userns, struct inode *inode,
device_number);
mknod_out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -660,7 +656,8 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
struct inode *newInode = NULL;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page;
xid = get_xid();
@@ -687,11 +684,13 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
cifs_put_tlink(tlink);
free_xid(xid);
- return ERR_PTR(-ENOMEM);
+ free_dentry_path(page);
+ return ERR_CAST(full_path);
}
if (d_really_is_positive(direntry)) {
@@ -727,7 +726,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
}
newInode = ERR_PTR(rc);
}
- kfree(full_path);
+ free_dentry_path(page);
cifs_put_tlink(tlink);
free_xid(xid);
return d_splice_alias(newInode, direntry);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index af49b3937e15..3d4e6e7dac1d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -530,7 +530,8 @@ int cifs_open(struct inode *inode, struct file *file)
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifsFileInfo *cfile = NULL;
- const char *full_path = NULL;
+ void *page;
+ const char *full_path;
bool posix_open_ok = false;
struct cifs_fid fid;
struct cifs_pending_open open;
@@ -546,9 +547,10 @@ int cifs_open(struct inode *inode, struct file *file)
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
- full_path = build_path_from_dentry(file_dentry(file));
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(file_dentry(file), page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -640,7 +642,7 @@ int cifs_open(struct inode *inode, struct file *file)
}
out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -689,7 +691,8 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
struct TCP_Server_Info *server;
struct cifsInodeInfo *cinode;
struct inode *inode;
- const char *full_path = NULL;
+ void *page;
+ const char *full_path;
int desired_access;
int disposition = FILE_OPEN;
int create_options = CREATE_NOT_DIR;
@@ -699,9 +702,8 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
mutex_lock(&cfile->fh_mutex);
if (!cfile->invalidHandle) {
mutex_unlock(&cfile->fh_mutex);
- rc = 0;
free_xid(xid);
- return rc;
+ return 0;
}
inode = d_inode(cfile->dentry);
@@ -715,12 +717,13 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
* called and if the server was down that means we end up here, and we
* can never tell if the caller already has the rename_sem.
*/
- full_path = build_path_from_dentry(cfile->dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
mutex_unlock(&cfile->fh_mutex);
+ free_dentry_path(page);
free_xid(xid);
- return rc;
+ return PTR_ERR(full_path);
}
cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n",
@@ -838,7 +841,7 @@ cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush)
cifs_relock_file(cfile);
reopen_error_exit:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
@@ -2069,34 +2072,31 @@ cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
int flags,
struct cifsFileInfo **ret_file)
{
- struct list_head *tmp;
struct cifsFileInfo *cfile;
- struct cifsInodeInfo *cinode;
- const char *full_path;
+ void *page = alloc_dentry_path();
*ret_file = NULL;
spin_lock(&tcon->open_file_lock);
- list_for_each(tmp, &tcon->openFileList) {
- cfile = list_entry(tmp, struct cifsFileInfo,
- tlist);
- full_path = build_path_from_dentry(cfile->dentry);
- if (full_path == NULL) {
+ list_for_each_entry(cfile, &tcon->openFileList, tlist) {
+ struct cifsInodeInfo *cinode;
+ const char *full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
spin_unlock(&tcon->open_file_lock);
- return -ENOMEM;
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
}
- if (strcmp(full_path, name)) {
- kfree(full_path);
+ if (strcmp(full_path, name))
continue;
- }
- kfree(full_path);
cinode = CIFS_I(d_inode(cfile->dentry));
spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
return cifs_get_writable_file(cinode, flags, ret_file);
}
spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
return -ENOENT;
}
@@ -2104,35 +2104,32 @@ int
cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file)
{
- struct list_head *tmp;
struct cifsFileInfo *cfile;
- struct cifsInodeInfo *cinode;
- const char *full_path;
+ void *page = alloc_dentry_path();
*ret_file = NULL;
spin_lock(&tcon->open_file_lock);
- list_for_each(tmp, &tcon->openFileList) {
- cfile = list_entry(tmp, struct cifsFileInfo,
- tlist);
- full_path = build_path_from_dentry(cfile->dentry);
- if (full_path == NULL) {
+ list_for_each_entry(cfile, &tcon->openFileList, tlist) {
+ struct cifsInodeInfo *cinode;
+ const char *full_path = build_path_from_dentry(cfile->dentry, page);
+ if (IS_ERR(full_path)) {
spin_unlock(&tcon->open_file_lock);
- return -ENOMEM;
+ free_dentry_path(page);
+ return PTR_ERR(full_path);
}
- if (strcmp(full_path, name)) {
- kfree(full_path);
+ if (strcmp(full_path, name))
continue;
- }
- kfree(full_path);
cinode = CIFS_I(d_inode(cfile->dentry));
spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
*ret_file = find_readable_file(cinode, 0);
return *ret_file ? 0 : -ENOENT;
}
spin_unlock(&tcon->open_file_lock);
+ free_dentry_path(page);
return -ENOENT;
}
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 0b29893f40b7..fe3a50a39f41 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1609,7 +1609,8 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
unsigned int xid;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page;
struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_inode;
struct super_block *sb = dir->i_sb;
@@ -1629,6 +1630,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
server = tcon->ses->server;
xid = get_xid();
+ page = alloc_dentry_path();
if (tcon->nodelete) {
rc = -EACCES;
@@ -1637,9 +1639,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
/* Unlink can be called from rename so we can not take the
* sb->s_vfs_rename_mutex here */
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto unlink_out;
}
@@ -1713,7 +1715,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
cifs_inode = CIFS_I(dir);
CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
unlink_out:
- kfree(full_path);
+ free_dentry_path(page);
kfree(attrs);
free_xid(xid);
cifs_put_tlink(tlink);
@@ -1867,6 +1869,7 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
const char *full_path;
+ void *page;
cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
mode, inode);
@@ -1879,9 +1882,10 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
xid = get_xid();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto mkdir_out;
}
@@ -1924,7 +1928,7 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
* attributes are invalid now.
*/
CIFS_I(inode)->time = 0;
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -1938,16 +1942,17 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
struct cifsInodeInfo *cifsInode;
cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
xid = get_xid();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto rmdir_exit;
}
@@ -1997,7 +2002,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
current_time(inode);
rmdir_exit:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
@@ -2072,8 +2077,8 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
struct dentry *source_dentry, struct inode *target_dir,
struct dentry *target_dentry, unsigned int flags)
{
- const char *from_name = NULL;
- const char *to_name = NULL;
+ const char *from_name, *to_name;
+ void *page1, *page2;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@@ -2091,21 +2096,19 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
+ page1 = alloc_dentry_path();
+ page2 = alloc_dentry_path();
xid = get_xid();
- /*
- * we already have the rename sem so we do not need to
- * grab it again here to protect the path integrity
- */
- from_name = build_path_from_dentry(source_dentry);
- if (from_name == NULL) {
- rc = -ENOMEM;
+ from_name = build_path_from_dentry(source_dentry, page1);
+ if (IS_ERR(from_name)) {
+ rc = PTR_ERR(from_name);
goto cifs_rename_exit;
}
- to_name = build_path_from_dentry(target_dentry);
- if (to_name == NULL) {
- rc = -ENOMEM;
+ to_name = build_path_from_dentry(target_dentry, page2);
+ if (IS_ERR(to_name)) {
+ rc = PTR_ERR(to_name);
goto cifs_rename_exit;
}
@@ -2177,8 +2180,8 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
cifs_rename_exit:
kfree(info_buf_source);
- kfree(from_name);
- kfree(to_name);
+ free_dentry_path(page2);
+ free_dentry_path(page1);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -2317,7 +2320,8 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
int rc = 0;
struct inode *inode = d_inode(dentry);
struct super_block *sb = dentry->d_sb;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page;
int count = 0;
if (inode == NULL)
@@ -2328,11 +2332,10 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
xid = get_xid();
- /* can not safely grab the rename sem here if rename calls revalidate
- since that would deadlock */
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -2351,7 +2354,7 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
if (rc == -EAGAIN && count++ < 10)
goto again;
out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
@@ -2613,7 +2616,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
int rc;
unsigned int xid;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
struct inode *inode = d_inode(direntry);
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -2634,9 +2638,9 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
if (rc < 0)
goto out;
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -2748,7 +2752,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
cifsInode->time = 0;
out:
kfree(args);
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
@@ -2764,7 +2768,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
int rc = -EACCES;
__u32 dosattr = 0;
__u64 mode = NO_CHANGE_64;
@@ -2778,16 +2783,13 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
attrs->ia_valid |= ATTR_FORCE;
rc = setattr_prepare(&init_user_ns, direntry, attrs);
- if (rc < 0) {
- free_xid(xid);
- return rc;
- }
+ if (rc < 0)
+ goto cifs_setattr_exit;
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
- free_xid(xid);
- return rc;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ goto cifs_setattr_exit;
}
/*
@@ -2937,8 +2939,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
mark_inode_dirty(inode);
cifs_setattr_exit:
- kfree(full_path);
free_xid(xid);
+ free_dentry_path(page);
return rc;
}
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index aba573dd86ac..08d99fec593e 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -43,12 +43,15 @@ static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
struct dentry *dentry = filep->f_path.dentry;
const unsigned char *path;
+ void *page = alloc_dentry_path();
__le16 *utf16_path = NULL, root_path;
int rc = 0;
- path = build_path_from_dentry(dentry);
- if (path == NULL)
- return -ENOMEM;
+ path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(path)) {
+ free_dentry_path(page);
+ return PTR_ERR(path);
+ }
cifs_dbg(FYI, "%s %s\n", __func__, path);
@@ -73,7 +76,7 @@ static long cifs_ioctl_query_info(unsigned int xid, struct file *filep,
ici_exit:
if (utf16_path != &root_path)
kfree(utf16_path);
- kfree(path);
+ free_dentry_path(page);
return rc;
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 18e0e31a6d39..616e1bc0cc0a 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -510,8 +510,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
{
int rc = -EACCES;
unsigned int xid;
- const char *from_name = NULL;
- const char *to_name = NULL;
+ const char *from_name, *to_name;
+ void *page1, *page2;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@@ -524,11 +524,17 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
tcon = tlink_tcon(tlink);
xid = get_xid();
+ page1 = alloc_dentry_path();
+ page2 = alloc_dentry_path();
- from_name = build_path_from_dentry(old_file);
- to_name = build_path_from_dentry(direntry);
- if ((from_name == NULL) || (to_name == NULL)) {
- rc = -ENOMEM;
+ from_name = build_path_from_dentry(old_file, page1);
+ if (IS_ERR(from_name)) {
+ rc = PTR_ERR(from_name);
+ goto cifs_hl_exit;
+ }
+ to_name = build_path_from_dentry(direntry, page2);
+ if (IS_ERR(to_name)) {
+ rc = PTR_ERR(to_name);
goto cifs_hl_exit;
}
@@ -587,8 +593,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
}
cifs_hl_exit:
- kfree(from_name);
- kfree(to_name);
+ free_dentry_path(page1);
+ free_dentry_path(page2);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -600,7 +606,8 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
{
int rc = -ENOMEM;
unsigned int xid;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page;
char *target_path = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink = NULL;
@@ -620,11 +627,13 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
tcon = tlink_tcon(tlink);
server = tcon->ses->server;
- full_path = build_path_from_dentry(direntry);
- if (!full_path) {
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
free_xid(xid);
cifs_put_tlink(tlink);
- return ERR_PTR(-ENOMEM);
+ free_dentry_path(page);
+ return ERR_CAST(full_path);
}
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
@@ -649,7 +658,7 @@ cifs_get_link(struct dentry *direntry, struct inode *inode,
&target_path, reparse_point);
}
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
if (rc != 0) {
@@ -669,7 +678,8 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
struct inode *newinode = NULL;
xid = get_xid();
@@ -681,9 +691,9 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
}
pTcon = tlink_tcon(tlink);
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto symlink_exit;
}
@@ -719,7 +729,7 @@ cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
}
}
symlink_exit:
- kfree(full_path);
+ free_dentry_path(page);
cifs_put_tlink(tlink);
free_xid(xid);
return rc;
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 67c3177a1fda..7531e8905881 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -942,13 +942,14 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
char *tmp_buf = NULL;
char *end_of_smb;
unsigned int max_len;
- const char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
xid = get_xid();
- full_path = build_path_from_dentry(file_dentry(file));
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(file_dentry(file), page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto rddir2_exit;
}
@@ -1043,7 +1044,7 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
kfree(tmp_buf);
rddir2_exit:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 30cfbebdd8b4..65fc65b26d84 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2217,20 +2217,21 @@ smb3_notify(const unsigned int xid, struct file *pfile,
struct smb3_notify notify;
struct dentry *dentry = pfile->f_path.dentry;
struct inode *inode = file_inode(pfile);
- struct cifs_sb_info *cifs_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_open_parms oparms;
struct cifs_fid fid;
struct cifs_tcon *tcon;
- const unsigned char *path = NULL;
+ const unsigned char *path;
+ void *page = alloc_dentry_path();
__le16 *utf16_path = NULL;
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
int rc = 0;
- path = build_path_from_dentry(dentry);
- if (path == NULL)
- return -ENOMEM;
-
- cifs_sb = CIFS_SB(inode->i_sb);
+ path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(path)) {
+ rc = PTR_ERR(path);
+ goto notify_exit;
+ }
utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
if (utf16_path == NULL) {
@@ -2264,7 +2265,7 @@ smb3_notify(const unsigned int xid, struct file *pfile,
cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
notify_exit:
- kfree(path);
+ free_dentry_path(page);
kfree(utf16_path);
return rc;
}
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 0195a9be3d28..e351b945135b 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -113,6 +113,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
+ void *page;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -120,10 +121,11 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
pTcon = tlink_tcon(tlink);
xid = get_xid();
+ page = alloc_dentry_path();
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
/* return dos attributes as pseudo xattr */
@@ -235,7 +237,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
}
out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -298,6 +300,7 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
+ void *page;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
@@ -305,10 +308,11 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
pTcon = tlink_tcon(tlink);
xid = get_xid();
+ page = alloc_dentry_path();
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -401,7 +405,7 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
rc = -EOPNOTSUPP;
out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -415,6 +419,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
const char *full_path;
+ void *page;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
return -EOPNOTSUPP;
@@ -425,10 +430,11 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
pTcon = tlink_tcon(tlink);
xid = get_xid();
+ page = alloc_dentry_path();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto list_ea_exit;
}
/* return dos attributes as pseudo xattr */
@@ -442,7 +448,7 @@ ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
full_path, NULL, data, buf_size, cifs_sb);
list_ea_exit:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
--
2.27.0
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