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cifs: add refcounted and timestamped container for holding tcons

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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>
This commit is contained in:
Jeff Layton
2010-09-29 19:51:11 -04:00
committed by Steve French
parent f3983c2133
commit 7ffec37245
9 changed files with 376 additions and 148 deletions
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87
fs/cifs/link.c
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@@ -249,7 +249,8 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr,
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 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr,
/* 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 @@ CIFSCheckMFSymlink(struct cifs_fattr *fattr,
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 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
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 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
/* 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 @@ cifs_hl_exit:
kfree(fromName);
kfree(toName);
FreeXid(xid);
cifs_put_tlink(tlink);
return rc;
}
@@ -390,10 +404,19 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
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 @@ out:
}
FreeXid(xid);
if (tlink)
cifs_put_tlink(tlink);
nd_set_link(nd, target_path);
return NULL;
}
@@ -451,22 +476,25 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
{
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 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
d_instantiate(direntry, newinode);
}
}
symlink_exit:
kfree(full_path);
cifs_put_tlink(tlink);
FreeXid(xid);
return rc;
}