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cifs: for compound requests, use open handle if possible 

For smb2_compound_op, it is possible to pass a ref to
an already open file. We should be passing it whenever possible.
i.e. if a matching handle is already kept open.

If we don't do that, we will end up breaking leases for files
kept open on the same client.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Shyam Prasad N 2021-07-30 06:43:09 +00:00 committed by Steve French
parent 4ac0536f88
commit b6f2a0f89d
1 changed files with 17 additions and 5 deletions
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22
fs/cifs/smb2inode.c
View File

@ -46,6 +46,10 @@ struct cop_vars {
struct smb2_file_link_info link_info;
};
/*
* note: If cfile is passed, the reference to it is dropped here.
* So make sure that you do not reuse cfile after return from this func.
*/
static int
smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, const char *full_path,
@ -536,10 +540,11 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
create_options |= OPEN_REPARSE_POINT;
/* Failed on a symbolic link - query a reparse point info */
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, ACL_NO_MODE,
smb2_data, SMB2_OP_QUERY_INFO, NULL);
smb2_data, SMB2_OP_QUERY_INFO, cfile);
}
if (rc)
goto out;
@ -587,10 +592,11 @@ smb311_posix_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
create_options |= OPEN_REPARSE_POINT;
/* Failed on a symbolic link - query a reparse point info */
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, ACL_NO_MODE,
smb2_data, SMB2_OP_POSIX_QUERY_INFO, NULL);
smb2_data, SMB2_OP_POSIX_QUERY_INFO, cfile);
}
if (rc)
goto out;
@ -707,10 +713,12 @@ smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb, bool set_alloc)
{
__le64 eof = cpu_to_le64(size);
struct cifsFileInfo *cfile;
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
return smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_WRITE_DATA, FILE_OPEN, 0, ACL_NO_MODE,
&eof, SMB2_OP_SET_EOF, NULL);
&eof, SMB2_OP_SET_EOF, cfile);
}
int
@ -719,6 +727,8 @@ smb2_set_file_info(struct inode *inode, const char *full_path,
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct cifsFileInfo *cfile;
int rc;
if ((buf->CreationTime == 0) && (buf->LastAccessTime == 0) &&
@ -729,10 +739,12 @@ smb2_set_file_info(struct inode *inode, const char *full_path,
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
rc = smb2_compound_op(xid, tlink_tcon(tlink), cifs_sb, full_path,
cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
rc = smb2_compound_op(xid, tcon, cifs_sb, full_path,
FILE_WRITE_ATTRIBUTES, FILE_OPEN,
0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, NULL);
0, ACL_NO_MODE, buf, SMB2_OP_SET_INFO, cfile);
cifs_put_tlink(tlink);
return rc;
}