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cifs: add initial reconfigure support 

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2020-12-14 16:40:18 +10:00 committed by Steve French
parent 522aa3b575
commit d6a7878340
1 changed files with 33 additions and 3 deletions
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36
fs/cifs/fs_context.c
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@ -621,12 +621,42 @@ static void smb3_fs_context_free(struct fs_context *fc)
smb3_cleanup_fs_context(ctx);
}
/*
* Compare the old and new proposed context during reconfigure
* and check if the changes are compatible.
*/
static int smb3_verify_reconfigure_ctx(struct smb3_fs_context *new_ctx,
struct smb3_fs_context *old_ctx)
{
if (new_ctx->sectype != old_ctx->sectype) {
cifs_dbg(VFS, "can not change sec during remount\n");
return -EINVAL;
}
return 0;
}
static int smb3_reconfigure(struct fs_context *fc)
{
// TODO: struct smb3_fs_context *ctx = smb3_fc2context(fc);
struct smb3_fs_context *ctx = smb3_fc2context(fc);
struct dentry *root = fc->root;
struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
int rc;
/* FIXME : add actual reconfigure */
return 0;
rc = smb3_verify_reconfigure_ctx(ctx, cifs_sb->ctx);
if (rc)
return rc;
/*
* Steal the UNC from the old and to be destroyed context.
*/
ctx->UNC = cifs_sb->ctx->UNC;
cifs_sb->ctx->UNC = NULL;
smb3_cleanup_fs_context_contents(cifs_sb->ctx);
rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
return rc;
}
static int smb3_fs_context_parse_param(struct fs_context *fc,