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smb: Fix regression in writes when non-standard maximum write size negotiated

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The conversion to netfs in the 6.3 kernel caused a regression when
maximum write size is set by the server to an unexpected value which is
not a multiple of 4096 (similarly if the user overrides the maximum
write size by setting mount parm "wsize", but sets it to a value that
is not a multiple of 4096).  When negotiated write size is not a
multiple of 4096 the netfs code can skip the end of the final
page when doing large sequential writes, causing data corruption.

This section of code is being rewritten/removed due to a large
netfs change, but until that point (ie for the 6.3 kernel until now)
we can not support non-standard maximum write sizes.

Add a warning if a user specifies a wsize on mount that is not
a multiple of 4096 (and round down), also add a change where we
round down the maximum write size if the server negotiates a value
that is not a multiple of 4096 (we also have to check to make sure that
we do not round it down to zero).

Reported-by: R. Diez" <rdiez-2006@rd10.de>
Fixes: d08089f649 ("cifs: Change the I/O paths to use an iterator rather than a page list")
Suggested-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Acked-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Tested-by: Matthew Ruffell <matthew.ruffell@canonical.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Cc: stable@vger.kernel.org # v6.3+
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2024-02-06 16:34:22 -06:00
parent 8bde59b20d
commit 4860abb91f
2 changed files with 23 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
fs/smb/client/connect.c
View file

@ -3444,8 +3444,18 @@ int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
* the user on mount
*/
if ((cifs_sb->ctx->wsize == 0) ||
(cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx)))
cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
(cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))) {
cifs_sb->ctx->wsize =
round_down(server->ops->negotiate_wsize(tcon, ctx), PAGE_SIZE);
/*
* in the very unlikely event that the server sent a max write size under PAGE_SIZE,
* (which would get rounded down to 0) then reset wsize to absolute minimum eg 4096
*/
if (cifs_sb->ctx->wsize == 0) {
cifs_sb->ctx->wsize = PAGE_SIZE;
cifs_dbg(VFS, "wsize too small, reset to minimum ie PAGE_SIZE, usually 4096\n");
}
}
if ((cifs_sb->ctx->rsize == 0) ||
(cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx)))
cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);

11
fs/smb/client/fs_context.c
View file

@ -1111,6 +1111,17 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
case Opt_wsize:
ctx->wsize = result.uint_32;
ctx->got_wsize = true;
if (ctx->wsize % PAGE_SIZE != 0) {
ctx->wsize = round_down(ctx->wsize, PAGE_SIZE);
if (ctx->wsize == 0) {
ctx->wsize = PAGE_SIZE;
cifs_dbg(VFS, "wsize too small, reset to minimum %ld\n", PAGE_SIZE);
} else {
cifs_dbg(VFS,
"wsize rounded down to %d to multiple of PAGE_SIZE %ld\n",
ctx->wsize, PAGE_SIZE);
}
}
break;
case Opt_acregmax:
ctx->acregmax = HZ * result.uint_32;