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cifs: add a helper to find an existing readable handle to a file 

and convert smb2_query_path_info() to use it.
This will eliminate the need for a SMB2_Create when we already have an
open handle that can be used. This will also prevent a oplock break
in case the other handle holds a lease.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2019-09-09 15:30:00 +10:00 committed by Steve French
parent 563317ec30
commit 496902dc17
3 changed files with 61 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/cifsproto.h
View File

@ -140,6 +140,8 @@ extern int cifs_get_writable_file(struct cifsInodeInfo *cifs_inode,
extern int cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file);
extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *, bool);
extern int cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file);
extern unsigned int smbCalcSize(void *buf, struct TCP_Server_Info *server);
extern int decode_negTokenInit(unsigned char *security_blob, int length,
struct TCP_Server_Info *server);

36
fs/cifs/file.c
View File

@ -2008,6 +2008,42 @@ cifs_get_writable_path(struct cifs_tcon *tcon, const char *name,
return -ENOENT;
}
int
cifs_get_readable_path(struct cifs_tcon *tcon, const char *name,
struct cifsFileInfo **ret_file)
{
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct cifsInodeInfo *cinode;
char *full_path;
*ret_file = NULL;
spin_lock(&tcon->open_file_lock);
list_for_each(tmp, &tcon->openFileList) {
cfile = list_entry(tmp, struct cifsFileInfo,
tlist);
full_path = build_path_from_dentry(cfile->dentry);
if (full_path == NULL) {
spin_unlock(&tcon->open_file_lock);
return -ENOMEM;
}
if (strcmp(full_path, name)) {
kfree(full_path);
continue;
}
kfree(full_path);
cinode = CIFS_I(d_inode(cfile->dentry));
spin_unlock(&tcon->open_file_lock);
*ret_file = find_readable_file(cinode, 0);
return *ret_file ? 0 : -ENOENT;
}
spin_unlock(&tcon->open_file_lock);
return -ENOENT;
}
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
{
struct address_space *mapping = page->mapping;

28
fs/cifs/smb2inode.c
View File

@ -125,15 +125,31 @@ smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
rqst[num_rqst].rq_iov = qi_iov;
rqst[num_rqst].rq_nvec = 1;
rc = SMB2_query_info_init(tcon, &rqst[num_rqst], COMPOUND_FID,
COMPOUND_FID, FILE_ALL_INFORMATION,
if (cfile)
rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
FILE_ALL_INFORMATION,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_all_info) +
PATH_MAX * 2, 0, NULL);
else {
rc = SMB2_query_info_init(tcon, &rqst[num_rqst],
COMPOUND_FID,
COMPOUND_FID,
FILE_ALL_INFORMATION,
SMB2_O_INFO_FILE, 0,
sizeof(struct smb2_file_all_info) +
PATH_MAX * 2, 0, NULL);
if (!rc) {
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst]);
}
}
if (rc)
goto finished;
smb2_set_next_command(tcon, &rqst[num_rqst]);
smb2_set_related(&rqst[num_rqst++]);
num_rqst++;
trace_smb3_query_info_compound_enter(xid, ses->Suid, tcon->tid,
full_path);
break;
@ -421,6 +437,7 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
__u32 create_options = 0;
struct cifs_fid fid;
bool no_cached_open = tcon->nohandlecache;
struct cifsFileInfo *cfile;
*adjust_tz = false;
*symlink = false;
@ -452,9 +469,10 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
cifs_get_readable_path(tcon, full_path, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_READ_ATTRIBUTES, FILE_OPEN, create_options,
smb2_data, SMB2_OP_QUERY_INFO, NULL);
smb2_data, SMB2_OP_QUERY_INFO, cfile);
if (rc == -EOPNOTSUPP) {
*symlink = true;
create_options |= OPEN_REPARSE_POINT;