cifs: add refcounted and timestamped container for holding tcons
Eventually, we'll need to track the use of tcons on a per-sb basis, so that
we know when it's ok to tear them down. Begin this conversion by adding a
new "tcon_link" struct and accessors that get it. For now, the core data
structures are untouched -- cifs_sb still just points to a single tcon and
the pointers are just cast to deal with the accessor functions. A later
patch will flesh this out.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 66db2d6..b38fe67 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -249,7 +249,8 @@
int rc;
int oplock = 0;
__u16 netfid = 0;
- struct cifsTconInfo *pTcon = cifs_sb_tcon(cifs_sb);
+ struct tcon_link *tlink;
+ struct cifsTconInfo *pTcon;
u8 *buf;
char *pbuf;
unsigned int bytes_read = 0;
@@ -261,23 +262,30 @@
/* it's not a symlink */
return 0;
+ 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,
CREATE_NOT_DIR, &netfid, &oplock, &file_info,
cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc != 0)
- return rc;
+ goto out;
if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
CIFSSMBClose(xid, pTcon, netfid);
/* it's not a symlink */
- return 0;
+ goto out;
}
buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ if (!buf) {
+ rc = -ENOMEM;
+ goto out;
+ }
pbuf = buf;
rc = CIFSSMBRead(xid, pTcon, netfid,
@@ -287,23 +295,28 @@
CIFSSMBClose(xid, pTcon, netfid);
if (rc != 0) {
kfree(buf);
- return rc;
+ goto out;
}
rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
kfree(buf);
- if (rc == -EINVAL)
+ if (rc == -EINVAL) {
/* it's not a symlink */
- return 0;
+ rc = 0;
+ goto out;
+ }
+
if (rc != 0)
- return rc;
+ 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;
- return 0;
+out:
+ cifs_put_tlink(tlink);
+ return rc;
}
int
@@ -314,18 +327,18 @@
int xid;
char *fromName = NULL;
char *toName = NULL;
- struct cifs_sb_info *cifs_sb_target;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
struct cifsInodeInfo *cifsInode;
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+ pTcon = tlink_tcon(tlink);
+
xid = GetXid();
- cifs_sb_target = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb_tcon(cifs_sb_target);
-
-/* No need to check for cross device links since server will do that
- BB note DFS case in future though (when we may have to check) */
-
fromName = build_path_from_dentry(old_file);
toName = build_path_from_dentry(direntry);
if ((fromName == NULL) || (toName == NULL)) {
@@ -336,13 +349,13 @@
/* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
if (pTcon->unix_ext)
rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
- cifs_sb_target->local_nls,
- cifs_sb_target->mnt_cifs_flags &
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
else {
rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
- cifs_sb_target->local_nls,
- cifs_sb_target->mnt_cifs_flags &
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if ((rc == -EIO) || (rc == -EINVAL))
rc = -EOPNOTSUPP;
@@ -378,6 +391,7 @@
kfree(fromName);
kfree(toName);
FreeXid(xid);
+ cifs_put_tlink(tlink);
return rc;
}
@@ -390,10 +404,19 @@
char *full_path = NULL;
char *target_path = NULL;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
- struct cifsTconInfo *tcon = cifs_sb_tcon(cifs_sb);
+ struct tcon_link *tlink = NULL;
+ struct cifsTconInfo *tcon;
xid = GetXid();
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ tlink = NULL;
+ goto out;
+ }
+ tcon = tlink_tcon(tlink);
+
/*
* For now, we just handle symlinks with unix extensions enabled.
* Eventually we should handle NTFS reparse points, and MacOS
@@ -442,6 +465,8 @@
}
FreeXid(xid);
+ if (tlink)
+ cifs_put_tlink(tlink);
nd_set_link(nd, target_path);
return NULL;
}
@@ -451,22 +476,25 @@
{
int rc = -EOPNOTSUPP;
int xid;
- struct cifs_sb_info *cifs_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct tcon_link *tlink;
struct cifsTconInfo *pTcon;
char *full_path = NULL;
struct inode *newinode = NULL;
xid = GetXid();
- cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = cifs_sb_tcon(cifs_sb);
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink)) {
+ rc = PTR_ERR(tlink);
+ goto symlink_exit;
+ }
+ pTcon = tlink_tcon(tlink);
full_path = build_path_from_dentry(direntry);
-
if (full_path == NULL) {
rc = -ENOMEM;
- FreeXid(xid);
- return rc;
+ goto symlink_exit;
}
cFYI(1, "Full path: %s", full_path);
@@ -504,8 +532,9 @@
d_instantiate(direntry, newinode);
}
}
-
+symlink_exit:
kfree(full_path);
+ cifs_put_tlink(tlink);
FreeXid(xid);
return rc;
}