struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
unsigned int flags)
{
unsigned int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
struct inode *newInode = NULL;
char *full_path = NULL;
xid = get_xid();
cifs_dbg(FYI, "parent inode = 0x%p name is: %s and dentry = 0x%p\n",
parent_dir_inode, direntry->d_name.name, direntry);
/* check whether path exists */
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
free_xid(xid);
return (struct dentry *)tlink;
}
pTcon = tlink_tcon(tlink);
rc = check_name(direntry);
if (rc)
goto lookup_out;
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
goto lookup_out;
}
if (direntry->d_inode != NULL) {
cifs_dbg(FYI, "non-NULL inode in lookup\n");
} else {
cifs_dbg(FYI, "NULL inode in lookup\n");
}
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
full_path, direntry->d_inode);
if (pTcon->unix_ext) {
rc = cifs_get_inode_info_unix(&newInode, full_path,
parent_dir_inode->i_sb, xid);
} else {
rc = cifs_get_inode_info(&newInode, full_path, NULL,
parent_dir_inode->i_sb, xid, NULL);
}
if ((rc == 0) && (newInode != NULL)) {
d_add(direntry, newInode);
/* since paths are not looked up by component - the parent
directories are presumed to be good here */
renew_parental_timestamps(direntry);
} else if (rc == -ENOENT) {
rc = 0;
direntry->d_time = jiffies;
d_add(direntry, NULL);
/* if it was once a directory (but how can we tell?) we could do
shrink_dcache_parent(direntry); */
} else if (rc != -EACCES) {
cifs_dbg(VFS, "Unexpected lookup error %d\n", rc);
/* We special case check for Access Denied - since that
is a common return code */
}
lookup_out:
kfree(full_path);
cifs_put_tlink(tlink);
free_xid(xid);
return ERR_PTR(rc);
}
struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, struct nameidata *nd)
{
int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct inode *newInode = NULL;
char *full_path = NULL;
xid = GetXid();
cFYI(1,
(" parent inode = 0x%p name is: %s and dentry = 0x%p",
parent_dir_inode, direntry->d_name.name, direntry));
/* BB Add check of incoming data - e.g. frame not longer than maximum SMB - let server check the namelen BB */
/* check whether path exists */
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
pTcon = cifs_sb->tcon;
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
full_path = build_path_from_dentry(direntry);
if(full_path == NULL) {
FreeXid(xid);
return ERR_PTR(-ENOMEM);
}
if (direntry->d_inode != NULL) {
cFYI(1, (" non-NULL inode in lookup"));
} else {
cFYI(1, (" NULL inode in lookup"));
}
cFYI(1,
(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
if (pTcon->ses->capabilities & CAP_UNIX)
rc = cifs_get_inode_info_unix(&newInode, full_path,
parent_dir_inode->i_sb,xid);
else
rc = cifs_get_inode_info(&newInode, full_path, NULL,
parent_dir_inode->i_sb,xid);
if ((rc == 0) && (newInode != NULL)) {
direntry->d_op = &cifs_dentry_ops;
d_add(direntry, newInode);
/* since paths are not looked up by component - the parent directories are presumed to be good here */
renew_parental_timestamps(direntry);
} else if (rc == -ENOENT) {
rc = 0;
d_add(direntry, NULL);
} else {
cERROR(1,("Error 0x%x on cifs_get_inode_info in lookup of %s",
rc,full_path));
/* BB special case check for Access Denied - watch security
exposure of returning dir info implicitly via different rc
if file exists or not but no access BB */
}
kfree(full_path);
FreeXid(xid);
return ERR_PTR(rc);
}
struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
struct nameidata *nd)
{
int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
__u32 oplock = 0;
__u16 fileHandle = 0;
bool posix_open = false;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *pTcon;
struct cifsFileInfo *cfile;
struct inode *newInode = NULL;
char *full_path = NULL;
struct file *filp;
xid = GetXid();
cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p",
parent_dir_inode, direntry->d_name.name, direntry);
/* check whether path exists */
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
FreeXid(xid);
return (struct dentry *)tlink;
}
pTcon = tlink_tcon(tlink);
/*
* Don't allow the separator character in a path component.
* The VFS will not allow "/", but "\" is allowed by posix.
*/
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
int i;
for (i = 0; i < direntry->d_name.len; i++)
if (direntry->d_name.name[i] == '\\') {
cFYI(1, "Invalid file name");
rc = -EINVAL;
goto lookup_out;
}
}
/*
* O_EXCL: optimize away the lookup, but don't hash the dentry. Let
* the VFS handle the create.
*/
if (nd && (nd->flags & LOOKUP_EXCL)) {
d_instantiate(direntry, NULL);
rc = 0;
goto lookup_out;
}
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
rc = -ENOMEM;
goto lookup_out;
}
if (direntry->d_inode != NULL) {
cFYI(1, "non-NULL inode in lookup");
} else {
cFYI(1, "NULL inode in lookup");
}
cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode);
/* Posix open is only called (at lookup time) for file create now.
* For opens (rather than creates), because we do not know if it
* is a file or directory yet, and current Samba no longer allows
* us to do posix open on dirs, we could end up wasting an open call
* on what turns out to be a dir. For file opens, we wait to call posix
* open till cifs_open. It could be added here (lookup) in the future
* but the performance tradeoff of the extra network request when EISDIR
* or EACCES is returned would have to be weighed against the 50%
* reduction in network traffic in the other paths.
*/
if (pTcon->unix_ext) {
if (nd && !(nd->flags & LOOKUP_DIRECTORY) &&
(nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
(nd->intent.open.file->f_flags & O_CREAT)) {
rc = cifs_posix_open(full_path, &newInode,
parent_dir_inode->i_sb,
nd->intent.open.create_mode,
nd->intent.open.file->f_flags, &oplock,
&fileHandle, xid);
/*
* The check below works around a bug in POSIX
* open in samba versions 3.3.1 and earlier where
* open could incorrectly fail with invalid parameter.
* If either that or op not supported returned, follow
* the normal lookup.
*/
if ((rc == 0) || (rc == -ENOENT))
posix_open = true;
else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP))
pTcon->broken_posix_open = true;
}
if (!posix_open)
rc = cifs_get_inode_info_unix(&newInode, full_path,
parent_dir_inode->i_sb, xid);
} else
rc = cifs_get_inode_info(&newInode, full_path, NULL,
parent_dir_inode->i_sb, xid, NULL);
if ((rc == 0) && (newInode != NULL)) {
d_add(direntry, newInode);
if (posix_open) {
filp = lookup_instantiate_filp(nd, direntry,
generic_file_open);
if (IS_ERR(filp)) {
rc = PTR_ERR(filp);
CIFSSMBClose(xid, pTcon, fileHandle);
goto lookup_out;
}
cfile = cifs_new_fileinfo(fileHandle, filp, tlink,
oplock);
if (cfile == NULL) {
fput(filp);
CIFSSMBClose(xid, pTcon, fileHandle);
rc = -ENOMEM;
goto lookup_out;
}
}
/* since paths are not looked up by component - the parent
directories are presumed to be good here */
renew_parental_timestamps(direntry);
} else if (rc == -ENOENT) {
rc = 0;
direntry->d_time = jiffies;
d_add(direntry, NULL);
/* if it was once a directory (but how can we tell?) we could do
shrink_dcache_parent(direntry); */
} else if (rc != -EACCES) {
cERROR(1, "Unexpected lookup error %d", rc);
/* We special case check for Access Denied - since that
is a common return code */
}
lookup_out:
kfree(full_path);
cifs_put_tlink(tlink);
FreeXid(xid);
return ERR_PTR(rc);
}
struct dentry *
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
struct nameidata *nd)
{
int xid;
int rc = 0; /* to get around spurious gcc warning, set to zero here */
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct inode *newInode = NULL;
char *full_path = NULL;
xid = GetXid();
cFYI(1,
(" parent inode = 0x%p name is: %s and dentry = 0x%p",
parent_dir_inode, direntry->d_name.name, direntry));
/* check whether path exists */
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
pTcon = cifs_sb->tcon;
/*
* Don't allow the separator character in a path component.
* The VFS will not allow "/", but "\" is allowed by posix.
*/
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
int i;
for (i = 0; i < direntry->d_name.len; i++)
if (direntry->d_name.name[i] == '\\') {
cFYI(1, ("Invalid file name"));
FreeXid(xid);
return ERR_PTR(-EINVAL);
}
}
/* can not grab the rename sem here since it would
deadlock in the cases (beginning of sys_rename itself)
in which we already have the sb rename sem */
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
FreeXid(xid);
return ERR_PTR(-ENOMEM);
}
if (direntry->d_inode != NULL) {
cFYI(1, (" non-NULL inode in lookup"));
} else {
cFYI(1, (" NULL inode in lookup"));
}
cFYI(1,
(" Full path: %s inode = 0x%p", full_path, direntry->d_inode));
if (pTcon->ses->capabilities & CAP_UNIX)
rc = cifs_get_inode_info_unix(&newInode, full_path,
parent_dir_inode->i_sb, xid);
else
rc = cifs_get_inode_info(&newInode, full_path, NULL,
parent_dir_inode->i_sb, xid);
if ((rc == 0) && (newInode != NULL)) {
if (pTcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
else
direntry->d_op = &cifs_dentry_ops;
d_add(direntry, newInode);
/* since paths are not looked up by component - the parent
directories are presumed to be good here */
renew_parental_timestamps(direntry);
} else if (rc == -ENOENT) {
rc = 0;
direntry->d_time = jiffies;
if (pTcon->nocase)
direntry->d_op = &cifs_ci_dentry_ops;
else
direntry->d_op = &cifs_dentry_ops;
d_add(direntry, NULL);
/* if it was once a directory (but how can we tell?) we could do
shrink_dcache_parent(direntry); */
} else {
cERROR(1, ("Error 0x%x on cifs_get_inode_info in lookup of %s",
rc, full_path));
/* BB special case check for Access Denied - watch security
exposure of returning dir info implicitly via different rc
if file exists or not but no access BB */
}
kfree(full_path);
FreeXid(xid);
return ERR_PTR(rc);
}
