[PATCH 0/8] Clean up MF-Symlink code and add readlink support for DFS shares

[Sachin Prabhu]

The following set of patches was created as a result of an error
reported by Red Hat QA which requires code to allow us to call
readlink on dfs shares.

Along with a fix for this issue, it appeared to be a good time to
clean up the M-F symlink code to make it protocol agnostic as well
as fix a couple of bugs in it.

Sachin Prabhu (8):
cifs: We do not drop reference to tlink in CIFSCheckMFSymlink()
cifs: Rename and cleanup open_query_close_cifs_symlink()
cifs: Rename MF symlink function names
cifs: use protocol specific call for query_mf_symlink()
cifs: Add create MFSymlinks to protocol ops struct
cifs: Re-order M-F Symlink code
cifs: move unix extension call to cifs_query_symlink()
cifs: Add support for readlink on dfs shares under posix extensions

fs/cifs/cifsglob.h | 8 +-
fs/cifs/cifsproto.h | 20 ++--
fs/cifs/inode.c | 10 +-
fs/cifs/link.c | 315 ++++++++++++++++++++++++----------------------------
fs/cifs/readdir.c | 2 +-
fs/cifs/smb1ops.c | 55 +++++++--
6 files changed, 218 insertions(+), 192 deletions(-)

[Sachin Prabhu]

Rename open_query_close_cifs_symlink to cifs_query_mf_symlink() to make
the name more consistent with other protocol version specific functions.

We also pass tcon as an argument to the function. This is already
available in the calling functions and we can avoid having to make an
unnecessary lookup.

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/cifsglob.h | 5 +++--
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/link.c | 37 ++++++++++++-------------------------
fs/cifs/smb1ops.c | 2 +-
4 files changed, 20 insertions(+), 31 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d9ea7ad..e844515 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -370,8 +370,9 @@ struct smb_version_operations {
void (*new_lease_key)(struct cifs_fid *);
int (*generate_signingkey)(struct cifs_ses *);
int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
- int (*query_mf_symlink)(const unsigned char *, char *, unsigned int *,
- struct cifs_sb_info *, unsigned int);
+ int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
+ struct cifs_sb_info *, const unsigned char *,
+ char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 2c29db6..10b9ab1 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -496,7 +496,8 @@ void cifs_writev_complete(struct work_struct *work);
struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,
work_func_t complete);
void cifs_writedata_release(struct kref *refcount);
-int open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
- unsigned int *pbytes_read, struct cifs_sb_info *cifs_sb,
- unsigned int xid);
+int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ const unsigned char *path, char *pbuf,
+ unsigned int *pbytes_read);
#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 92aee08..2a5837a 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -305,54 +305,41 @@ CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
}

int
-open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
- unsigned int *pbytes_read, struct cifs_sb_info *cifs_sb,
- unsigned int xid)
+cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_read)
{
int rc;
int oplock = 0;
__u16 netfid = 0;
- struct tcon_link *tlink;
- struct cifs_tcon *ptcon;
struct cifs_io_parms io_parms;
int buf_type = CIFS_NO_BUFFER;
FILE_ALL_INFO file_info;

- tlink = cifs_sb_tlink(cifs_sb);
- if (IS_ERR(tlink))
- return PTR_ERR(tlink);
- ptcon = tlink_tcon(tlink);
-
- rc = CIFSSMBOpen(xid, ptcon, path, FILE_OPEN, GENERIC_READ,
+ rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
CREATE_NOT_DIR, &netfid, &oplock, &file_info,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
- if (rc != 0) {
- cifs_put_tlink(tlink);
+ if (rc)
return rc;
- }

- if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
- CIFSSMBClose(xid, ptcon, netfid);
- cifs_put_tlink(tlink);
+ if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE))
/* it's not a symlink */
- return rc;
- }
+ goto out;

io_parms.netfid = netfid;
io_parms.pid = current->tgid;
- io_parms.tcon = ptcon;
+ io_parms.tcon = tcon;
io_parms.offset = 0;
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;

rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
- CIFSSMBClose(xid, ptcon, netfid);
- cifs_put_tlink(tlink);
+out:
+ CIFSSMBClose(xid, tcon, netfid);
return rc;
}

-
int
CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
@@ -372,8 +359,8 @@ CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
return -ENOMEM;

if (tcon->ses->server->ops->query_mf_symlink)
- rc = tcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read, cifs_sb, xid);
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
else
rc = -ENOSYS;

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 5f5ba0d..099c276 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1009,7 +1009,7 @@ struct smb_version_operations smb1_operations = {
.mand_lock = cifs_mand_lock,
.mand_unlock_range = cifs_unlock_range,
.push_mand_locks = cifs_push_mandatory_locks,
- .query_mf_symlink = open_query_close_cifs_symlink,
+ .query_mf_symlink = cifs_query_mf_symlink,
.is_read_op = cifs_is_read_op,
};

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:49 +0000

Post by Sachin Prabhu
Rename open_query_close_cifs_symlink to cifs_query_mf_symlink() to make
the name more consistent with other protocol version specific functions.
We also pass tcon as an argument to the function. This is already
available in the calling functions and we can avoid having to make an
unnecessary lookup.
---
fs/cifs/cifsglob.h | 5 +++--
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/link.c | 37 ++++++++++++-------------------------
fs/cifs/smb1ops.c | 2 +-
4 files changed, 20 insertions(+), 31 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d9ea7ad..e844515 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -370,8 +370,9 @@ struct smb_version_operations {
void (*new_lease_key)(struct cifs_fid *);
int (*generate_signingkey)(struct cifs_ses *);
int (*calc_signature)(struct smb_rqst *, struct TCP_Server_Info *);
- int (*query_mf_symlink)(const unsigned char *, char *, unsigned int *,
- struct cifs_sb_info *, unsigned int);
+ int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
+ struct cifs_sb_info *, const unsigned char *,
+ char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 2c29db6..10b9ab1 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -496,7 +496,8 @@ void cifs_writev_complete(struct work_struct *work);
struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,
work_func_t complete);
void cifs_writedata_release(struct kref *refcount);
-int open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
- unsigned int *pbytes_read, struct cifs_sb_info *cifs_sb,
- unsigned int xid);
+int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ const unsigned char *path, char *pbuf,
+ unsigned int *pbytes_read);
#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 92aee08..2a5837a 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -305,54 +305,41 @@ CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
}
int
-open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
- unsigned int *pbytes_read, struct cifs_sb_info *cifs_sb,
- unsigned int xid)
+cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_read)
{
int rc;
int oplock = 0;
__u16 netfid = 0;
- struct tcon_link *tlink;
- struct cifs_tcon *ptcon;
struct cifs_io_parms io_parms;
int buf_type = CIFS_NO_BUFFER;
FILE_ALL_INFO file_info;
- tlink = cifs_sb_tlink(cifs_sb);
- if (IS_ERR(tlink))
- return PTR_ERR(tlink);
- ptcon = tlink_tcon(tlink);
-
- rc = CIFSSMBOpen(xid, ptcon, path, FILE_OPEN, GENERIC_READ,
+ rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
CREATE_NOT_DIR, &netfid, &oplock, &file_info,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
- if (rc != 0) {
- cifs_put_tlink(tlink);
+ if (rc)
return rc;
- }
- if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
- CIFSSMBClose(xid, ptcon, netfid);
- cifs_put_tlink(tlink);
+ if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE))
/* it's not a symlink */
- return rc;
- }
+ goto out;
io_parms.netfid = netfid;
io_parms.pid = current->tgid;
- io_parms.tcon = ptcon;
+ io_parms.tcon = tcon;
io_parms.offset = 0;
io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
- CIFSSMBClose(xid, ptcon, netfid);
- cifs_put_tlink(tlink);
+ CIFSSMBClose(xid, tcon, netfid);
return rc;
}
-
int
CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
@@ -372,8 +359,8 @@ CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
return -ENOMEM;
if (tcon->ses->server->ops->query_mf_symlink)
- rc = tcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read, cifs_sb, xid);
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
else
rc = -ENOSYS;
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 5f5ba0d..099c276 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1009,7 +1009,7 @@ struct smb_version_operations smb1_operations = {
.mand_lock = cifs_mand_lock,
.mand_unlock_range = cifs_unlock_range,
.push_mand_locks = cifs_push_mandatory_locks,
- .query_mf_symlink = open_query_close_cifs_symlink,
+ .query_mf_symlink = cifs_query_mf_symlink,
.is_read_op = cifs_is_read_op,
};

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

Add a new protocol ops function create_mf_symlink and have
create_mf_symlink() use it.

This patchset moves the MFSymlink operations completely to the
ops structure so that we only use the right protocol versions when
querying or creating MFSymlinks.

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/cifsglob.h | 3 ++
fs/cifs/cifsproto.h | 4 +++
fs/cifs/link.c | 88 ++++++++++++++++++++++++++++-------------------------
fs/cifs/smb1ops.c | 1 +
4 files changed, 54 insertions(+), 42 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e844515..1781e89 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -373,6 +373,9 @@ struct smb_version_operations {
int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
+ int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
+ struct cifs_sb_info *, const unsigned char *,
+ char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 78bb6d6..e88c3b1 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -500,4 +500,8 @@ int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const unsigned char *path, char *pbuf,
unsigned int *pbytes_read);
+int cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ const unsigned char *path, char *pbuf,
+ unsigned int *pbytes_written);
#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index f8aaf10..d45d43d 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -180,59 +180,31 @@ format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)

static int
create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const char *fromName, const char *toName,
- struct cifs_sb_info *cifs_sb)
+ struct cifs_sb_info *cifs_sb, const char *fromName,
+ const char *toName)
{
int rc;
- int oplock = 0;
- int remap;
- int create_options = CREATE_NOT_DIR;
- __u16 netfid = 0;
u8 *buf;
unsigned int bytes_written = 0;
- struct cifs_io_parms io_parms;
- struct nls_table *nls_codepage;
-
- nls_codepage = cifs_sb->local_nls;
- remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;

buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;

rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
- if (rc != 0) {
- kfree(buf);
- return rc;
- }
-
- if (backup_cred(cifs_sb))
- create_options |= CREATE_OPEN_BACKUP_INTENT;
-
- rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
- create_options, &netfid, &oplock, NULL,
- nls_codepage, remap);
- if (rc != 0) {
- kfree(buf);
- return rc;
- }
-
- io_parms.netfid = netfid;
- io_parms.pid = current->tgid;
- io_parms.tcon = tcon;
- io_parms.offset = 0;
- io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+ if (rc)
+ goto out;

- rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
- CIFSSMBClose(xid, tcon, netfid);
- kfree(buf);
- if (rc != 0)
- return rc;
+ rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, cifs_sb,
+ fromName, buf, &bytes_written);
+ if (rc)
+ goto out;

if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
- return -EIO;
-
- return 0;
+ rc = -EIO;
+out:
+ kfree(buf);
+ return rc;
}

static int
@@ -320,6 +292,39 @@ out:
}

int
+cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_written)
+{
+ int rc;
+ int oplock = 0;
+ __u16 netfid = 0;
+ struct cifs_io_parms io_parms;
+ int create_options = CREATE_NOT_DIR;
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ rc = CIFSSMBOpen(xid, tcon, path, FILE_CREATE, GENERIC_WRITE,
+ create_options, &netfid, &oplock, NULL,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (rc)
+ return rc;
+
+ io_parms.netfid = netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+
+ rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf, NULL, 0);
+ CIFSSMBClose(xid, tcon, netfid);
+ return rc;
+}
+
+int
check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
const unsigned char *path)
@@ -551,8 +556,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)

/* BB what if DFS and this volume is on different share? BB */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = create_mf_symlink(xid, pTcon, full_path, symname,
- cifs_sb);
+ rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
else if (pTcon->unix_ext)
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
cifs_sb->local_nls);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 099c276..1470ec4 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1010,6 +1010,7 @@ struct smb_version_operations smb1_operations = {
.mand_unlock_range = cifs_unlock_range,
.push_mand_locks = cifs_push_mandatory_locks,
.query_mf_symlink = cifs_query_mf_symlink,
+ .create_mf_symlink = cifs_create_mf_symlink,
.is_read_op = cifs_is_read_op,
};

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:52 +0000

Post by Sachin Prabhu
Add a new protocol ops function create_mf_symlink and have
create_mf_symlink() use it.
This patchset moves the MFSymlink operations completely to the
ops structure so that we only use the right protocol versions when
querying or creating MFSymlinks.
---
fs/cifs/cifsglob.h | 3 ++
fs/cifs/cifsproto.h | 4 +++
fs/cifs/link.c | 88 ++++++++++++++++++++++++++++-------------------------
fs/cifs/smb1ops.c | 1 +
4 files changed, 54 insertions(+), 42 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e844515..1781e89 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -373,6 +373,9 @@ struct smb_version_operations {
int (*query_mf_symlink)(unsigned int, struct cifs_tcon *,
struct cifs_sb_info *, const unsigned char *,
char *, unsigned int *);
+ int (*create_mf_symlink)(unsigned int, struct cifs_tcon *,
+ struct cifs_sb_info *, const unsigned char *,
+ char *, unsigned int *);
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 78bb6d6..e88c3b1 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -500,4 +500,8 @@ int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
const unsigned char *path, char *pbuf,
unsigned int *pbytes_read);
+int cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ const unsigned char *path, char *pbuf,
+ unsigned int *pbytes_written);
#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index f8aaf10..d45d43d 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -180,59 +180,31 @@ format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
static int
create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const char *fromName, const char *toName,
- struct cifs_sb_info *cifs_sb)
+ struct cifs_sb_info *cifs_sb, const char *fromName,
+ const char *toName)
{
int rc;
- int oplock = 0;
- int remap;
- int create_options = CREATE_NOT_DIR;
- __u16 netfid = 0;
u8 *buf;
unsigned int bytes_written = 0;
- struct cifs_io_parms io_parms;
- struct nls_table *nls_codepage;
-
- nls_codepage = cifs_sb->local_nls;
- remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
- if (rc != 0) {
- kfree(buf);
- return rc;
- }
-
- if (backup_cred(cifs_sb))
- create_options |= CREATE_OPEN_BACKUP_INTENT;
-
- rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
- create_options, &netfid, &oplock, NULL,
- nls_codepage, remap);
- if (rc != 0) {
- kfree(buf);
- return rc;
- }
-
- io_parms.netfid = netfid;
- io_parms.pid = current->tgid;
- io_parms.tcon = tcon;
- io_parms.offset = 0;
- io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+ if (rc)
+ goto out;
- rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
- CIFSSMBClose(xid, tcon, netfid);
- kfree(buf);
- if (rc != 0)
- return rc;
+ rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, cifs_sb,
+ fromName, buf, &bytes_written);
+ if (rc)
+ goto out;
if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
- return -EIO;
-
- return 0;
+ rc = -EIO;
+ kfree(buf);
+ return rc;
}
static int
}
int
+cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_written)
+{
+ int rc;
+ int oplock = 0;
+ __u16 netfid = 0;
+ struct cifs_io_parms io_parms;
+ int create_options = CREATE_NOT_DIR;
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ rc = CIFSSMBOpen(xid, tcon, path, FILE_CREATE, GENERIC_WRITE,
+ create_options, &netfid, &oplock, NULL,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (rc)
+ return rc;
+
+ io_parms.netfid = netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+
+ rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf, NULL, 0);
+ CIFSSMBClose(xid, tcon, netfid);
+ return rc;
+}
+
+int
check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
const unsigned char *path)
@@ -551,8 +556,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
/* BB what if DFS and this volume is on different share? BB */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = create_mf_symlink(xid, pTcon, full_path, symname,
- cifs_sb);
+ rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
else if (pTcon->unix_ext)
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
cifs_sb->local_nls);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 099c276..1470ec4 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -1010,6 +1010,7 @@ struct smb_version_operations smb1_operations = {
.mand_unlock_range = cifs_unlock_range,
.push_mand_locks = cifs_push_mandatory_locks,
.query_mf_symlink = cifs_query_mf_symlink,
+ .create_mf_symlink = cifs_create_mf_symlink,
.is_read_op = cifs_is_read_op,
};

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

Clean up camel case in functionnames.

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/cifsproto.h | 4 ++--
fs/cifs/inode.c | 12 ++++++------
fs/cifs/link.c | 32 +++++++++++++++-----------------
fs/cifs/readdir.c | 2 +-
4 files changed, 24 insertions(+), 26 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 10b9ab1..78bb6d6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -476,8 +476,8 @@ extern int CIFSSMBSetPosixACL(const unsigned int xid, struct cifs_tcon *tcon,
extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
-extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+extern bool couldbe_mf_symlink(const struct cifs_fattr *fattr);
+extern int check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
struct cifs_fattr *fattr,
const unsigned char *path);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 49719b8..6f7f57a 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,10 +383,10 @@ int cifs_get_inode_info_unix(struct inode **pinode,

/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
- full_path);
+ int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
- cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
+ cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}

if (*pinode == NULL) {
@@ -800,10 +800,10 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,

/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
- full_path);
+ tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
- cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
+ cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}

if (!*inode) {
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 2a5837a..2e7bbab 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -91,10 +91,8 @@ symlink_hash_err:
}

static int
-CIFSParseMFSymlink(const u8 *buf,
- unsigned int buf_len,
- unsigned int *_link_len,
- char **_link_str)
+parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
+ char **_link_str)
{
int rc;
unsigned int link_len;
@@ -137,7 +135,7 @@ CIFSParseMFSymlink(const u8 *buf,
}

static int
-CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
+format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
{
int rc;
unsigned int link_len;
@@ -181,7 +179,7 @@ CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
}

static int
-CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
+create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *fromName, const char *toName,
struct cifs_sb_info *cifs_sb)
{
@@ -202,7 +200,7 @@ CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
if (!buf)
return -ENOMEM;

- rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
+ rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
if (rc != 0) {
kfree(buf);
return rc;
@@ -238,7 +236,7 @@ CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
}

static int
-CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
+query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const unsigned char *searchName, char **symlinkinfo,
const struct nls_table *nls_codepage, int remap)
{
@@ -282,7 +280,7 @@ CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}

- rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
kfree(buf);
if (rc != 0)
return rc;
@@ -291,7 +289,7 @@ CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
}

bool
-CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
+couldbe_mf_symlink(const struct cifs_fattr *fattr)
{
if (!(fattr->cf_mode & S_IFREG))
/* it's not a symlink */
@@ -341,16 +339,16 @@ out:
}

int
-CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
- const unsigned char *path)
+check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;

- if (!CIFSCouldBeMFSymlink(fattr))
+ if (!couldbe_mf_symlink(fattr))
/* it's not a symlink */
return 0;

@@ -370,7 +368,7 @@ CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
if (bytes_read == 0) /* not a symlink */
goto out;

- rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
if (rc == -EINVAL) {
/* it's not a symlink */
rc = 0;
@@ -517,7 +515,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
* and fallback to UNIX Extensions Symlinks.
*/
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
+ rc = query_mf_symlink(xid, tcon, full_path, &target_path,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
@@ -574,7 +572,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)

/* BB what if DFS and this volume is on different share? BB */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
+ rc = create_mf_symlink(xid, pTcon, full_path, symname,
cifs_sb);
else if (pTcon->unix_ext)
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 5940eca..b15862e 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -749,7 +749,7 @@ static int cifs_filldir(char *find_entry, struct file *file,
}

if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
- CIFSCouldBeMFSymlink(&fattr))
+ couldbe_mf_symlink(&fattr))
/*
* trying to get the type and mode can be slow,
* so just call those regular files for now, and mark

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:50 +0000

Post by Sachin Prabhu
Clean up camel case in functionnames.
---
fs/cifs/cifsproto.h | 4 ++--
fs/cifs/inode.c | 12 ++++++------
fs/cifs/link.c | 32 +++++++++++++++-----------------
fs/cifs/readdir.c | 2 +-
4 files changed, 24 insertions(+), 26 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 10b9ab1..78bb6d6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -476,8 +476,8 @@ extern int CIFSSMBSetPosixACL(const unsigned int xid, struct cifs_tcon *tcon,
extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
-extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+extern bool couldbe_mf_symlink(const struct cifs_fattr *fattr);
+extern int check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
struct cifs_fattr *fattr,
const unsigned char *path);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 49719b8..6f7f57a 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,10 +383,10 @@ int cifs_get_inode_info_unix(struct inode **pinode,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
- full_path);
+ int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
- cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
+ cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
if (*pinode == NULL) {
@@ -800,10 +800,10 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
- full_path);
+ tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
- cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
+ cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
}
if (!*inode) {
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 2a5837a..2e7bbab 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
}
static int
-CIFSParseMFSymlink(const u8 *buf,
- unsigned int buf_len,
- unsigned int *_link_len,
- char **_link_str)
+parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
+ char **_link_str)
{
int rc;
unsigned int link_len;
@@ -137,7 +135,7 @@ CIFSParseMFSymlink(const u8 *buf,
}
static int
-CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
+format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
{
int rc;
unsigned int link_len;
@@ -181,7 +179,7 @@ CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
}
static int
-CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
+create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *fromName, const char *toName,
struct cifs_sb_info *cifs_sb)
{
@@ -202,7 +200,7 @@ CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
if (!buf)
return -ENOMEM;
- rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
+ rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
if (rc != 0) {
kfree(buf);
return rc;
@@ -238,7 +236,7 @@ CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
}
static int
-CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
+query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const unsigned char *searchName, char **symlinkinfo,
const struct nls_table *nls_codepage, int remap)
{
@@ -282,7 +280,7 @@ CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
- rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
kfree(buf);
if (rc != 0)
return rc;
@@ -291,7 +289,7 @@ CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
}
bool
-CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
+couldbe_mf_symlink(const struct cifs_fattr *fattr)
{
if (!(fattr->cf_mode & S_IFREG))
/* it's not a symlink */
}
int
-CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
- const unsigned char *path)
+check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;
- if (!CIFSCouldBeMFSymlink(fattr))
+ if (!couldbe_mf_symlink(fattr))
/* it's not a symlink */
return 0;
@@ -370,7 +368,7 @@ CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
if (bytes_read == 0) /* not a symlink */
goto out;
- rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
if (rc == -EINVAL) {
/* it's not a symlink */
rc = 0;
@@ -517,7 +515,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
* and fallback to UNIX Extensions Symlinks.
*/
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
+ rc = query_mf_symlink(xid, tcon, full_path, &target_path,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
@@ -574,7 +572,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
/* BB what if DFS and this volume is on different share? BB */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
+ rc = create_mf_symlink(xid, pTcon, full_path, symname,
cifs_sb);
else if (pTcon->unix_ext)
rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 5940eca..b15862e 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -749,7 +749,7 @@ static int cifs_filldir(char *find_entry, struct file *file,
}
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
- CIFSCouldBeMFSymlink(&fattr))
+ couldbe_mf_symlink(&fattr))
/*
* trying to get the type and mode can be slow,
* so just call those regular files for now, and mark

Meh...ok...

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

Unix extensions rigth now are only applicable to smb1 operations.
Move the check and subsequent unix extension call to the smb1
specific call to query_symlink() ie. cifs_query_symlink().

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/link.c | 5 +----
fs/cifs/smb1ops.c | 20 ++++++++++++++------
2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index ee5ae46..67d9243 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -516,10 +516,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
&target_path);

- if ((rc != 0) && cap_unix(tcon->ses))
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
- cifs_sb->local_nls);
- else if (rc != 0 && server->ops->query_symlink)
+ if (rc != 0 && server->ops->query_symlink)
rc = server->ops->query_symlink(xid, tcon, full_path,
&target_path, cifs_sb);

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 1470ec4..2d822dd 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -918,23 +918,31 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,

cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);

+ /* Check for unix extensions */
+ if (cap_unix(tcon->ses)) {
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ cifs_sb->local_nls);
+ goto out;
+ }
+
rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
FILE_READ_ATTRIBUTES, OPEN_REPARSE_POINT, &netfid,
&oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc)
- return rc;
+ goto out;

rc = CIFSSMBQuerySymLink(xid, tcon, netfid, target_path,
cifs_sb->local_nls);
- if (rc) {
- CIFSSMBClose(xid, tcon, netfid);
- return rc;
- }
+ if (rc)
+ goto out_close;

convert_delimiter(*target_path, '/');
+out_close:
CIFSSMBClose(xid, tcon, netfid);
- cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+out:
+ if (!rc)
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
return rc;
}

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:54 +0000

Post by Sachin Prabhu
Unix extensions rigth now are only applicable to smb1 operations.
Move the check and subsequent unix extension call to the smb1
specific call to query_symlink() ie. cifs_query_symlink().
---
fs/cifs/link.c | 5 +----
fs/cifs/smb1ops.c | 20 ++++++++++++++------
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index ee5ae46..67d9243 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -516,10 +516,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
&target_path);
- if ((rc != 0) && cap_unix(tcon->ses))
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
- cifs_sb->local_nls);
- else if (rc != 0 && server->ops->query_symlink)
+ if (rc != 0 && server->ops->query_symlink)
rc = server->ops->query_symlink(xid, tcon, full_path,
&target_path, cifs_sb);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 1470ec4..2d822dd 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -918,23 +918,31 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
+ /* Check for unix extensions */
+ if (cap_unix(tcon->ses)) {
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ cifs_sb->local_nls);
+ goto out;
+ }
+
rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
FILE_READ_ATTRIBUTES, OPEN_REPARSE_POINT, &netfid,
&oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc)
- return rc;
+ goto out;
rc = CIFSSMBQuerySymLink(xid, tcon, netfid, target_path,
cifs_sb->local_nls);
- if (rc) {
- CIFSSMBClose(xid, tcon, netfid);
- return rc;
- }
+ if (rc)
+ goto out_close;
convert_delimiter(*target_path, '/');
CIFSSMBClose(xid, tcon, netfid);
- cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+ if (!rc)
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
return rc;
}

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

When we obtain tcon from cifs_sb, we use cifs_sb_tlink() to first obtain
tlink which also grabs a reference to it. We do not drop this reference
to tlink once we are done with the call.

The patch fixes this issue by instead passing tcon as a parameter and
avoids having to obtain a reference to the tlink. A lookup for the tcon
is already made in the calling functions and this way we avoid having to
re-run the lookup. This is also consistent with the argument list for
other similar calls for M-F symlinks.

We should also return an ENOSYS when we do not find a protocol specific
function to lookup the MF Symlink data.

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/inode.c | 6 ++++--
fs/cifs/link.c | 26 +++++++++++---------------
3 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index aa33976..2c29db6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -477,9 +477,10 @@ extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid);
+extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_fattr *fattr,
+ const unsigned char *path);
extern int mdfour(unsigned char *, unsigned char *, int);
extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
const struct nls_table *codepage);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 36f9ebb..49719b8 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,7 +383,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,

/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ int tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
@@ -799,7 +800,8 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,

/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index cc02347..92aee08 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -354,34 +354,30 @@ open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,


int
-CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid)
+CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
- int rc = 0;
+ int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;
- struct cifs_tcon *ptcon;

if (!CIFSCouldBeMFSymlink(fattr))
/* it's not a symlink */
return 0;

buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!buf)
+ return -ENOMEM;

- ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
- if ((ptcon->ses) && (ptcon->ses->server->ops->query_mf_symlink))
- rc = ptcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read, cifs_sb, xid);
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(path, buf,
+ &bytes_read, cifs_sb, xid);
else
- goto out;
+ rc = -ENOSYS;

- if (rc != 0)
+ if (rc)
goto out;

if (bytes_read == 0) /* not a symlink */

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:48 +0000

Post by Sachin Prabhu
When we obtain tcon from cifs_sb, we use cifs_sb_tlink() to first obtain
tlink which also grabs a reference to it. We do not drop this reference
to tlink once we are done with the call.
The patch fixes this issue by instead passing tcon as a parameter and
avoids having to obtain a reference to the tlink. A lookup for the tcon
is already made in the calling functions and this way we avoid having to
re-run the lookup. This is also consistent with the argument list for
other similar calls for M-F symlinks.
We should also return an ENOSYS when we do not find a protocol specific
function to lookup the MF Symlink data.
---
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/inode.c | 6 ++++--
fs/cifs/link.c | 26 +++++++++++---------------
3 files changed, 19 insertions(+), 20 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index aa33976..2c29db6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -477,9 +477,10 @@ extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid);
+extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_fattr *fattr,
+ const unsigned char *path);
extern int mdfour(unsigned char *, unsigned char *, int);
extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
const struct nls_table *codepage);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 36f9ebb..49719b8 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,7 +383,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ int tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
@@ -799,7 +800,8 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index cc02347..92aee08 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -354,34 +354,30 @@ open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
int
-CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid)
+CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
- int rc = 0;
+ int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;
- struct cifs_tcon *ptcon;
if (!CIFSCouldBeMFSymlink(fattr))
/* it's not a symlink */
return 0;
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!buf)
+ return -ENOMEM;
- ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
- if ((ptcon->ses) && (ptcon->ses->server->ops->query_mf_symlink))
- rc = ptcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read, cifs_sb, xid);
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(path, buf,
+ &bytes_read, cifs_sb, xid);
else
- goto out;
+ rc = -ENOSYS;
- if (rc != 0)
+ if (rc)
goto out;
if (bytes_read == 0) /* not a symlink */

This should probably also go to stable?

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Steve French]

This looks like the only one small enough to merge for 3.13 (and I put
in cifs-2.6.git for-next). The others in the series for 3.14.
Opinions?

Post by Jeff Layton
On Mon, 25 Nov 2013 17:09:48 +0000

Post by Sachin Prabhu
When we obtain tcon from cifs_sb, we use cifs_sb_tlink() to first obtain
tlink which also grabs a reference to it. We do not drop this reference
to tlink once we are done with the call.
The patch fixes this issue by instead passing tcon as a parameter and
avoids having to obtain a reference to the tlink. A lookup for the tcon
is already made in the calling functions and this way we avoid having to
re-run the lookup. This is also consistent with the argument list for
other similar calls for M-F symlinks.
We should also return an ENOSYS when we do not find a protocol specific
function to lookup the MF Symlink data.
---
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/inode.c | 6 ++++--
fs/cifs/link.c | 26 +++++++++++---------------
3 files changed, 19 insertions(+), 20 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index aa33976..2c29db6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -477,9 +477,10 @@ extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid);
+extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_fattr *fattr,
+ const unsigned char *path);
extern int mdfour(unsigned char *, unsigned char *, int);
extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
const struct nls_table *codepage);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 36f9ebb..49719b8 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,7 +383,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ int tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
@@ -799,7 +800,8 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
+ tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d\n", tmprc);
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index cc02347..92aee08 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -354,34 +354,30 @@ open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
int
-CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int xid)
+CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
- int rc = 0;
+ int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;
- struct cifs_tcon *ptcon;
if (!CIFSCouldBeMFSymlink(fattr))
/* it's not a symlink */
return 0;
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!buf)
+ return -ENOMEM;
- ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
- if ((ptcon->ses) && (ptcon->ses->server->ops->query_mf_symlink))
- rc = ptcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read, cifs_sb, xid);
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(path, buf,
+ &bytes_read, cifs_sb, xid);
else
- goto out;
+ rc = -ENOSYS;
- if (rc != 0)
+ if (rc)
goto out;
if (bytes_read == 0) /* not a symlink */

This should probably also go to stable?
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
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[Sachin Prabhu]

Post by Steve French
This looks like the only one small enough to merge for 3.13 (and I put
in cifs-2.6.git for-next). The others in the series for 3.14.
Opinions?

That's fine. The other code is mostly code cleanup which can be fixed to
the next version and a bug which isn't very high on the priority list.

Sachin Prabhu

Post by Steve French
When we obtain tcon from cifs_sb, we use cifs_sb_tlink() to first obtain
tlink which also grabs a reference to it. We do not drop this reference
to tlink once we are done with the call.
The patch fixes this issue by instead passing tcon as a parameter and
avoids having to obtain a reference to the tlink. A lookup for the tcon
is already made in the calling functions and this way we avoid having to
re-run the lookup. This is also consistent with the argument list for
other similar calls for M-F symlinks.
We should also return an ENOSYS when we do not find a protocol specific
function to lookup the MF Symlink data.
---
fs/cifs/cifsproto.h | 7 ++++---
fs/cifs/inode.c | 6 ++++--
fs/cifs/link.c | 26 +++++++++++---------------
3 files changed, 19 insertions(+), 20 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index aa33976..2c29db6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -477,9 +477,10 @@ extern int CIFSGetExtAttr(const unsigned
int xid, struct cifs_tcon *tcon,
const int netfid, __u64 *pExtAttrBits,
__u64 *pMask);
extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
-extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int
xid);
+extern int CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ struct cifs_fattr *fattr,
+ const unsigned char *path);
extern int mdfour(unsigned char *, unsigned char *, int);
extern int E_md4hash(const unsigned char *passwd, unsigned char *p16,
const struct nls_table *codepage);
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 36f9ebb..49719b8 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -383,7 +383,8 @@ int cifs_get_inode_info_unix(struct inode **pinode,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- int tmprc = CIFSCheckMFSymlink(&fattr,
full_path, cifs_sb, xid);
+ int tmprc = CIFSCheckMFSymlink(xid, tcon,
cifs_sb, &fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d
\n", tmprc);
}
@@ -799,7 +800,8 @@ cifs_get_inode_info(struct inode **inode,
const char *full_path,
/* check for Minshall+French symlinks */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
- tmprc = CIFSCheckMFSymlink(&fattr, full_path,
cifs_sb, xid);
+ tmprc = CIFSCheckMFSymlink(xid, tcon, cifs_sb,
&fattr,
+ full_path);
if (tmprc)
cifs_dbg(FYI, "CIFSCheckMFSymlink: %d
\n", tmprc);
}
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index cc02347..92aee08 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -354,34 +354,30 @@ open_query_close_cifs_symlink(const
unsigned char *path, char *pbuf,
int
-CIFSCheckMFSymlink(struct cifs_fattr *fattr,
- const unsigned char *path,
- struct cifs_sb_info *cifs_sb, unsigned int
xid)
+CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct
cifs_fattr *fattr,
+ const unsigned char *path)
{
- int rc = 0;
+ int rc;
u8 *buf = NULL;
unsigned int link_len = 0;
unsigned int bytes_read = 0;
- struct cifs_tcon *ptcon;
if (!CIFSCouldBeMFSymlink(fattr))
/* it's not a symlink */
return 0;
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf) {
- rc = -ENOMEM;
- goto out;
- }
+ if (!buf)
+ return -ENOMEM;
- ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
- if ((ptcon->ses) &&
(ptcon->ses->server->ops->query_mf_symlink))
- rc =
ptcon->ses->server->ops->query_mf_symlink(path, buf,
- &bytes_read,
cifs_sb, xid);
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc =
tcon->ses->server->ops->query_mf_symlink(path, buf,
+ &bytes_read,
cifs_sb, xid);
else
- goto out;
+ rc = -ENOSYS;
- if (rc != 0)
+ if (rc)
goto out;
if (bytes_read == 0) /* not a symlink */
--
1.8.3.1
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--
Thanks,
Steve

[Sachin Prabhu]

We have an existing protocol specific call query_mf_symlink() created
for check_mf_symlink which can also be used for query_mf_symlink().

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/link.c | 61 +++++++++++++++++++---------------------------------------
1 file changed, 20 insertions(+), 41 deletions(-)

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 2e7bbab..f8aaf10 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -237,55 +237,36 @@ create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,

static int
query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const unsigned char *searchName, char **symlinkinfo,
- const struct nls_table *nls_codepage, int remap)
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char **symlinkinfo)
{
int rc;
- int oplock = 0;
- __u16 netfid = 0;
- u8 *buf;
- char *pbuf;
- unsigned int bytes_read = 0;
- int buf_type = CIFS_NO_BUFFER;
+ u8 *buf = NULL;
unsigned int link_len = 0;
- struct cifs_io_parms io_parms;
- FILE_ALL_INFO file_info;
-
- rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
- CREATE_NOT_DIR, &netfid, &oplock, &file_info,
- nls_codepage, remap);
- if (rc != 0)
- return rc;
-
- if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
- CIFSSMBClose(xid, tcon, netfid);
- /* it's not a symlink */
- return -EINVAL;
- }
+ unsigned int bytes_read = 0;

buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
- pbuf = buf;
- io_parms.netfid = netfid;
- io_parms.pid = current->tgid;
- io_parms.tcon = tcon;
- io_parms.offset = 0;
- io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;

- rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
- CIFSSMBClose(xid, tcon, netfid);
- if (rc != 0) {
- kfree(buf);
- return rc;
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
+ else
+ rc = -ENOSYS;
+
+ if (rc)
+ goto out;
+
+ if (bytes_read == 0) { /* not a symlink */
+ rc = -EINVAL;
+ goto out;
}

rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
+out:
kfree(buf);
- if (rc != 0)
- return rc;
-
- return 0;
+ return rc;
}

bool
@@ -515,10 +496,8 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
* and fallback to UNIX Extensions Symlinks.
*/
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = query_mf_symlink(xid, tcon, full_path, &target_path,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
+ &target_path);

if ((rc != 0) && cap_unix(tcon->ses))
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:51 +0000

Post by Sachin Prabhu
We have an existing protocol specific call query_mf_symlink() created
for check_mf_symlink which can also be used for query_mf_symlink().
---
fs/cifs/link.c | 61 +++++++++++++++++++---------------------------------------
1 file changed, 20 insertions(+), 41 deletions(-)
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 2e7bbab..f8aaf10 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -237,55 +237,36 @@ create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
static int
query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
- const unsigned char *searchName, char **symlinkinfo,
- const struct nls_table *nls_codepage, int remap)
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char **symlinkinfo)
{
int rc;
- int oplock = 0;
- __u16 netfid = 0;
- u8 *buf;
- char *pbuf;
- unsigned int bytes_read = 0;
- int buf_type = CIFS_NO_BUFFER;
+ u8 *buf = NULL;
unsigned int link_len = 0;
- struct cifs_io_parms io_parms;
- FILE_ALL_INFO file_info;
-
- rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
- CREATE_NOT_DIR, &netfid, &oplock, &file_info,
- nls_codepage, remap);
- if (rc != 0)
- return rc;
-
- if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
- CIFSSMBClose(xid, tcon, netfid);
- /* it's not a symlink */
- return -EINVAL;
- }
+ unsigned int bytes_read = 0;
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
- pbuf = buf;
- io_parms.netfid = netfid;
- io_parms.pid = current->tgid;
- io_parms.tcon = tcon;
- io_parms.offset = 0;
- io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
- rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
- CIFSSMBClose(xid, tcon, netfid);
- if (rc != 0) {
- kfree(buf);
- return rc;
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
+ else
+ rc = -ENOSYS;
+
+ if (rc)
+ goto out;
+
+ if (bytes_read == 0) { /* not a symlink */
+ rc = -EINVAL;
+ goto out;
}
rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
kfree(buf);
- if (rc != 0)
- return rc;
-
- return 0;
+ return rc;
}
bool
@@ -515,10 +496,8 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
* and fallback to UNIX Extensions Symlinks.
*/
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
- rc = query_mf_symlink(xid, tcon, full_path, &target_path,
- cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
+ &target_path);
if ((rc != 0) && cap_unix(tcon->ses))
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,

Nice cleanup.

Reviwed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

This patch makes cosmetic changes. We group similar functions together
and separate out the protocol specific functions.

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/link.c | 124 +++++++++++++++++++++++++++++++--------------------------
1 file changed, 68 insertions(+), 56 deletions(-)

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index d45d43d..ee5ae46 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -29,6 +29,10 @@
#include "cifs_debug.h"
#include "cifs_fs_sb.h"

+/*
+ * M-F Symlink Functions - Begin
+ */
+
#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
@@ -178,6 +182,20 @@ format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
return 0;
}

+bool
+couldbe_mf_symlink(const struct cifs_fattr *fattr)
+{
+ if (!(fattr->cf_mode & S_IFREG))
+ /* it's not a symlink */
+ return false;
+
+ if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
+ /* it's not a symlink */
+ return false;
+
+ return true;
+}
+
static int
create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *fromName,
@@ -241,20 +259,60 @@ out:
return rc;
}

-bool
-couldbe_mf_symlink(const struct cifs_fattr *fattr)
+int
+check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
- if (!(fattr->cf_mode & S_IFREG))
+ int rc;
+ u8 *buf = NULL;
+ unsigned int link_len = 0;
+ unsigned int bytes_read = 0;
+
+ if (!couldbe_mf_symlink(fattr))
/* it's not a symlink */
- return false;
+ return 0;

- if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
+ buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
+ else
+ rc = -ENOSYS;
+
+ if (rc)
+ goto out;
+
+ if (bytes_read == 0) /* not a symlink */
+ goto out;
+
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
+ if (rc == -EINVAL) {
/* it's not a symlink */
- return false;
+ rc = 0;
+ goto out;
+ }

- return true;
+ if (rc != 0)
+ goto out;
+
+ /* it is a symlink */
+ fattr->cf_eof = link_len;
+ fattr->cf_mode &= ~S_IFMT;
+ fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
+ fattr->cf_dtype = DT_LNK;
+out:
+ kfree(buf);
+ return rc;
}

+/*
+ * SMB 1.0 Protocol specific functions
+ */
+
int
cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const unsigned char *path,
@@ -324,55 +382,9 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
return rc;
}

-int
-check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
- const unsigned char *path)
-{
- int rc;
- u8 *buf = NULL;
- unsigned int link_len = 0;
- unsigned int bytes_read = 0;
-
- if (!couldbe_mf_symlink(fattr))
- /* it's not a symlink */
- return 0;
-
- buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- if (tcon->ses->server->ops->query_mf_symlink)
- rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
- cifs_sb, path, buf, &bytes_read);
- else
- rc = -ENOSYS;
-
- if (rc)
- goto out;
-
- if (bytes_read == 0) /* not a symlink */
- goto out;
-
- rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
- if (rc == -EINVAL) {
- /* it's not a symlink */
- rc = 0;
- goto out;
- }
-
- if (rc != 0)
- goto out;
-
- /* it is a symlink */
- fattr->cf_eof = link_len;
- fattr->cf_mode &= ~S_IFMT;
- fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
- fattr->cf_dtype = DT_LNK;
-out:
- kfree(buf);
- return rc;
-}
+/*
+ * M-F Symlink Functions - End
+ */

int
cifs_hardlink(struct dentry *old_file, struct inode *inode,

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:53 +0000

Post by Sachin Prabhu
This patch makes cosmetic changes. We group similar functions together
and separate out the protocol specific functions.
---
fs/cifs/link.c | 124 +++++++++++++++++++++++++++++++--------------------------
1 file changed, 68 insertions(+), 56 deletions(-)
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index d45d43d..ee5ae46 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -29,6 +29,10 @@
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
+/*
+ * M-F Symlink Functions - Begin
+ */
+
#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
@@ -178,6 +182,20 @@ format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
return 0;
}
+bool
+couldbe_mf_symlink(const struct cifs_fattr *fattr)
+{
+ if (!(fattr->cf_mode & S_IFREG))
+ /* it's not a symlink */
+ return false;
+
+ if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
+ /* it's not a symlink */
+ return false;
+
+ return true;
+}
+
static int
create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *fromName,
return rc;
}
-bool
-couldbe_mf_symlink(const struct cifs_fattr *fattr)
+int
+check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
+ const unsigned char *path)
{
- if (!(fattr->cf_mode & S_IFREG))
+ int rc;
+ u8 *buf = NULL;
+ unsigned int link_len = 0;
+ unsigned int bytes_read = 0;
+
+ if (!couldbe_mf_symlink(fattr))
/* it's not a symlink */
- return false;
+ return 0;
- if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
+ buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ if (tcon->ses->server->ops->query_mf_symlink)
+ rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
+ cifs_sb, path, buf, &bytes_read);
+ else
+ rc = -ENOSYS;
+
+ if (rc)
+ goto out;
+
+ if (bytes_read == 0) /* not a symlink */
+ goto out;
+
+ rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
+ if (rc == -EINVAL) {
/* it's not a symlink */
- return false;
+ rc = 0;
+ goto out;
+ }
- return true;
+ if (rc != 0)
+ goto out;
+
+ /* it is a symlink */
+ fattr->cf_eof = link_len;
+ fattr->cf_mode &= ~S_IFMT;
+ fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
+ fattr->cf_dtype = DT_LNK;
+ kfree(buf);
+ return rc;
}
+/*
+ * SMB 1.0 Protocol specific functions
+ */
+
int
cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const unsigned char *path,
@@ -324,55 +382,9 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
-int
-check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
- struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
- const unsigned char *path)
-{
- int rc;
- u8 *buf = NULL;
- unsigned int link_len = 0;
- unsigned int bytes_read = 0;
-
- if (!couldbe_mf_symlink(fattr))
- /* it's not a symlink */
- return 0;
-
- buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- if (tcon->ses->server->ops->query_mf_symlink)
- rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
- cifs_sb, path, buf, &bytes_read);
- else
- rc = -ENOSYS;
-
- if (rc)
- goto out;
-
- if (bytes_read == 0) /* not a symlink */
- goto out;
-
- rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
- if (rc == -EINVAL) {
- /* it's not a symlink */
- rc = 0;
- goto out;
- }
-
- if (rc != 0)
- goto out;
-
- /* it is a symlink */
- fattr->cf_eof = link_len;
- fattr->cf_mode &= ~S_IFMT;
- fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
- fattr->cf_dtype = DT_LNK;
- kfree(buf);
- return rc;
-}
+/*
+ * M-F Symlink Functions - End
+ */
int
cifs_hardlink(struct dentry *old_file, struct inode *inode,

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.

With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.

The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

Red Hat BZ: 1020715

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/smb1ops.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 2d822dd..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}

static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -920,8 +947,13 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,

/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Jeff Layton]

On Mon, 25 Nov 2013 17:09:55 +0000

Post by Sachin Prabhu
When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.
With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.
The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

nit: I know that DFS referrals are prefixed with a single backslash,
but it might look more like a UNC with a double backslash prefix:

lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \\vm140-31\test

...but I don't feel too strongly about it.

Post by Sachin Prabhu
Red Hat BZ: 1020715
---
fs/cifs/smb1ops.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 2d822dd..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}
static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -920,8 +947,13 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

Either way, this is a marked improvement:

Reviewed-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+***@public.gmane.org>

[Sachin Prabhu]

Post by Jeff Layton
On Mon, 25 Nov 2013 17:09:55 +0000

Post by Sachin Prabhu
When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.
With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.
The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

nit: I know that DFS referrals are prefixed with a single backslash,
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \\vm140-31\test
...but I don't feel too strongly about it.

Post by Sachin Prabhu
Red Hat BZ: 1020715
---
fs/cifs/smb1ops.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 2d822dd..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}
static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -920,8 +947,13 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,

It looks like I made a mistake in this line. When writing patch #7, I
introduced a bug here which results in a compilation error. I then wrote
the fix and applied it to the wrong patch ie. patch #8 instead of #7. I
will resend patches 7 and 8.

For now, I'll just resend the patches without including the proposed
change from Jeff so that we can get this error fixed quickly. If needed,
we can change the format in which the remote node is printed in a
separate patch.

Sachin Prabhu

Post by Jeff Layton

Post by Sachin Prabhu
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Jeff Layton]

On Wed, 27 Nov 2013 12:58:51 +0000

Post by Sachin Prabhu

Post by Jeff Layton
On Mon, 25 Nov 2013 17:09:55 +0000

Post by Sachin Prabhu
When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.
With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.
The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

nit: I know that DFS referrals are prefixed with a single backslash,
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \\vm140-31\test
...but I don't feel too strongly about it.

Post by Sachin Prabhu
Red Hat BZ: 1020715
---
fs/cifs/smb1ops.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 2d822dd..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}
static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -920,8 +947,13 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
/* Check for unix extensions */
if (cap_unix(tcon->ses)) {
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,

It looks like I made a mistake in this line. When writing patch #7, I
the fix and applied it to the wrong patch ie. patch #8 instead of #7. I
will resend patches 7 and 8.
For now, I'll just resend the patches without including the proposed
change from Jeff so that we can get this error fixed quickly. If needed,
we can change the format in which the remote node is printed in a
separate patch.
Sachin Prabhu

Fair enough. In fact, might be reasonable to follow the format that
samba's DFS symlinks use. Something like this, maybe?

lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> msdfs:\vm140-31\test

Post by Sachin Prabhu

Post by Jeff Layton

Post by Sachin Prabhu
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Christoph Hellwig]

I was going to complain that no filesystem should implement readlink
itself but use the generic wrappers around ->follow_link, but it turns
our you actually do implement follow_link through that query_link
API.

Please fix the subject, though.

[Sachin Prabhu]

Unix extensions rigth now are only applicable to smb1 operations.
Move the check and subsequent unix extension call to the smb1
specific call to query_symlink() ie. cifs_query_symlink().

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/link.c | 5 +----
fs/cifs/smb1ops.c | 20 ++++++++++++++------
2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index ee5ae46..67d9243 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -516,10 +516,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
&target_path);

- if ((rc != 0) && cap_unix(tcon->ses))
- rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
- cifs_sb->local_nls);
- else if (rc != 0 && server->ops->query_symlink)
+ if (rc != 0 && server->ops->query_symlink)
rc = server->ops->query_symlink(xid, tcon, full_path,
&target_path, cifs_sb);

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 1470ec4..988fddb7 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -918,23 +918,31 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,

cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);

+ /* Check for unix extensions */
+ if (cap_unix(tcon->ses)) {
+ rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
+ cifs_sb->local_nls);
+ goto out;
+ }
+
rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
FILE_READ_ATTRIBUTES, OPEN_REPARSE_POINT, &netfid,
&oplock, NULL, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc)
- return rc;
+ goto out;

rc = CIFSSMBQuerySymLink(xid, tcon, netfid, target_path,
cifs_sb->local_nls);
- if (rc) {
- CIFSSMBClose(xid, tcon, netfid);
- return rc;
- }
+ if (rc)
+ goto out_close;

convert_delimiter(*target_path, '/');
+out_close:
CIFSSMBClose(xid, tcon, netfid);
- cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
+out:
+ if (!rc)
+ cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
return rc;
}

[Sachin Prabhu]

When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.

With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.

The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/smb1ops.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 988fddb7..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}

static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -922,6 +949,11 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
if (cap_unix(tcon->ses)) {
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Sachin Prabhu]

I have posted version 3 of this patch incorporating changes suggested by
Christoph. The changes made are limited to the patch description with no
changes to the code.

Sachin Prabhu

Post by Sachin Prabhu
When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, readlink fails with -EREMOTE.
With added support for dfs shares on readlink when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.
The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test
---
fs/cifs/smb1ops.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 988fddb7..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}
static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -922,6 +949,11 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
if (cap_unix(tcon->ses)) {
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Sachin Prabhu]

When using posix extensions, dfs shares in the dfs root show up as
symlinks resulting in userland tools such as 'ls' calling readlink() on
these shares. Since these are dfs shares, we end up returning -EREMOTE.

$ ls -l /mnt
ls: cannot read symbolic link /mnt/test: Object is remote
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test

With added follow_link() support for dfs shares, when using unix
extensions, we call GET_DFS_REFERRAL to obtain the DFS referral and
return the first node returned.

The dfs share in the dfs root is now displayed in the following manner.
$ ls -l /mnt
total 0
lrwxrwxrwx. 1 root root 19 Nov 6 09:47 test -> \vm140-31\test

Signed-off-by: Sachin Prabhu <sprabhu-H+wXaHxf7aLQT0dZR+***@public.gmane.org>
---
fs/cifs/smb1ops.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 988fddb7..abd2cc9 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -908,6 +908,33 @@ cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
}

static int
+cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
+ const unsigned char *searchName, char **symlinkinfo,
+ const struct nls_table *nls_codepage)
+{
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+
+ rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
+ &num_referrals, &referrals, 0);
+
+ if (!rc && num_referrals > 0) {
+ *symlinkinfo = kstrndup(referrals->node_name,
+ strlen(referrals->node_name),
+ GFP_KERNEL);
+ if (!*symlinkinfo)
+ rc = -ENOMEM;
+ free_dfs_info_array(referrals, num_referrals);
+ }
+ return rc;
+#else /* No DFS support */
+ return -EREMOTE;
+#endif
+}
+
+static int
cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
const char *full_path, char **target_path,
struct cifs_sb_info *cifs_sb)
@@ -922,6 +949,11 @@ cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
if (cap_unix(tcon->ses)) {
rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,
cifs_sb->local_nls);
+ if (rc == -EREMOTE)
+ rc = cifs_unix_dfs_readlink(xid, tcon, full_path,
+ target_path,
+ cifs_sb->local_nls);
+
goto out;
}

[Steve French]

remaining 7 merged into cifs-2.6.git for-next

Post by Sachin Prabhu
The following set of patches was created as a result of an error
reported by Red Hat QA which requires code to allow us to call
readlink on dfs shares.
Along with a fix for this issue, it appeared to be a good time to
clean up the M-F symlink code to make it protocol agnostic as well
as fix a couple of bugs in it.
cifs: We do not drop reference to tlink in CIFSCheckMFSymlink()
cifs: Rename and cleanup open_query_close_cifs_symlink()
cifs: Rename MF symlink function names
cifs: use protocol specific call for query_mf_symlink()
cifs: Add create MFSymlinks to protocol ops struct
cifs: Re-order M-F Symlink code
cifs: move unix extension call to cifs_query_symlink()
cifs: Add support for readlink on dfs shares under posix extensions
fs/cifs/cifsglob.h | 8 +-
fs/cifs/cifsproto.h | 20 ++--
fs/cifs/inode.c | 10 +-
fs/cifs/link.c | 315 ++++++++++++++++++++++++----------------------------
fs/cifs/readdir.c | 2 +-
fs/cifs/smb1ops.c | 55 +++++++--
6 files changed, 218 insertions(+), 192 deletions(-)
--
1.8.3.1
--
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