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four cifs.ko client fixes

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Merge tag 'v6.11-rc5-smb-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - copy_file_range fix

 - two read fixes including read past end of file rc fix and read retry
   crediting fix

 - falloc zero range fix

* tag 'v6.11-rc5-smb-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Fix FALLOC_FL_ZERO_RANGE to preflush buffered part of target region
  cifs: Fix copy offload to flush destination region
  netfs, cifs: Fix handling of short DIO read
  cifs: Fix lack of credit renegotiation on read retry
This commit is contained in:
Linus Torvalds 2024-09-01 15:49:26 +12:00
commit 6b9ffc4595
8 changed files with 94 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/netfs/io.c
View File

@ -306,6 +306,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_io_request *rreq)
break;
subreq->source = NETFS_DOWNLOAD_FROM_SERVER;
subreq->error = 0;
__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
netfs_stat(&netfs_n_rh_download_instead);
trace_netfs_sreq(subreq, netfs_sreq_trace_download_instead);
netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit);
@ -313,6 +314,7 @@ static bool netfs_rreq_perform_resubmissions(struct netfs_io_request *rreq)
netfs_reset_subreq_iter(rreq, subreq);
netfs_read_from_server(rreq, subreq);
} else if (test_bit(NETFS_SREQ_SHORT_IO, &subreq->flags)) {
__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
netfs_reset_subreq_iter(rreq, subreq);
netfs_rreq_short_read(rreq, subreq);
}
@ -366,7 +368,8 @@ static void netfs_rreq_assess_dio(struct netfs_io_request *rreq)
if (subreq->error || subreq->transferred == 0)
break;
transferred += subreq->transferred;
if (subreq->transferred < subreq->len)
if (subreq->transferred < subreq->len ||
test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags))
break;
}
@ -501,7 +504,8 @@ void netfs_subreq_terminated(struct netfs_io_subrequest *subreq,
subreq->error = 0;
subreq->transferred += transferred_or_error;
if (subreq->transferred < subreq->len)
if (subreq->transferred < subreq->len &&
!test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags))
goto incomplete;
complete:
@ -780,11 +784,14 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync)
TASK_UNINTERRUPTIBLE);
ret = rreq->error;
if (ret == 0 && rreq->submitted < rreq->len &&
rreq->origin != NETFS_DIO_READ) {
if (ret == 0) {
if (rreq->origin == NETFS_DIO_READ) {
ret = rreq->transferred;
} else if (rreq->submitted < rreq->len) {
trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read);
ret = -EIO;
}
}
} else {
/* If we decrement nr_outstanding to 0, the ref belongs to us. */
if (atomic_dec_and_test(&rreq->nr_outstanding))

21
fs/smb/client/cifsfs.c
View File

@ -1341,7 +1341,6 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
struct cifsFileInfo *smb_file_target;
struct cifs_tcon *src_tcon;
struct cifs_tcon *target_tcon;
unsigned long long destend, fstart, fend;
ssize_t rc;
cifs_dbg(FYI, "copychunk range\n");
@ -1391,25 +1390,13 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
goto unlock;
}
destend = destoff + len - 1;
/* Flush the folios at either end of the destination range to prevent
* accidental loss of dirty data outside of the range.
/* Flush and invalidate all the folios in the destination region. If
* the copy was successful, then some of the flush is extra overhead,
* but we need to allow for the copy failing in some way (eg. ENOSPC).
*/
fstart = destoff;
fend = destend;
rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
if (rc)
goto unlock;
rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
if (rc)
goto unlock;
if (fend > target_cifsi->netfs.zero_point)
target_cifsi->netfs.zero_point = fend + 1;
/* Discard all the folios that overlap the destination region. */
truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
i_size_read(target_inode), 0);

1
fs/smb/client/cifsglob.h
View File

@ -1485,6 +1485,7 @@ struct cifs_io_subrequest {
struct cifs_io_request *req;
};
ssize_t got_bytes;
size_t actual_len;
unsigned int xid;
int result;
bool have_xid;

37
fs/smb/client/file.c
View File

@ -111,6 +111,7 @@ static void cifs_issue_write(struct netfs_io_subrequest *subreq)
goto fail;
}
wdata->actual_len = wdata->subreq.len;
rc = adjust_credits(wdata->server, wdata, cifs_trace_rw_credits_issue_write_adjust);
if (rc)
goto fail;
@ -153,7 +154,7 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq);
struct TCP_Server_Info *server = req->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb);
size_t rsize = 0;
size_t rsize;
int rc;
rdata->xid = get_xid();
@ -166,8 +167,8 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
cifs_sb->ctx);
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, &rsize,
&rdata->credits);
rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
&rsize, &rdata->credits);
if (rc) {
subreq->error = rc;
return false;
@ -183,7 +184,8 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq)
server->credits, server->in_flight, 0,
cifs_trace_rw_credits_read_submit);
subreq->len = min_t(size_t, subreq->len, rsize);
subreq->len = umin(subreq->len, rsize);
rdata->actual_len = subreq->len;
#ifdef CONFIG_CIFS_SMB_DIRECT
if (server->smbd_conn)
@ -203,12 +205,39 @@ static void cifs_req_issue_read(struct netfs_io_subrequest *subreq)
struct netfs_io_request *rreq = subreq->rreq;
struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq);
struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq);
struct TCP_Server_Info *server = req->server;
struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb);
int rc = 0;
cifs_dbg(FYI, "%s: op=%08x[%x] mapping=%p len=%zu/%zu\n",
__func__, rreq->debug_id, subreq->debug_index, rreq->mapping,
subreq->transferred, subreq->len);
if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) {
/*
* As we're issuing a retry, we need to negotiate some new
* credits otherwise the server may reject the op with
* INVALID_PARAMETER. Note, however, we may get back less
* credit than we need to complete the op, in which case, we
* shorten the op and rely on additional rounds of retry.
*/
size_t rsize = umin(subreq->len - subreq->transferred,
cifs_sb->ctx->rsize);
rc = server->ops->wait_mtu_credits(server, rsize, &rdata->actual_len,
&rdata->credits);
if (rc)
goto out;
rdata->credits.in_flight_check = 1;
trace_smb3_rw_credits(rdata->rreq->debug_id,
rdata->subreq.debug_index,
rdata->credits.value,
server->credits, server->in_flight, 0,
cifs_trace_rw_credits_read_resubmit);
}
if (req->cfile->invalidHandle) {
do {
rc = cifs_reopen_file(req->cfile, true);

18
fs/smb/client/smb2ops.c
View File

@ -301,7 +301,7 @@ smb2_adjust_credits(struct TCP_Server_Info *server,
unsigned int /*enum smb3_rw_credits_trace*/ trace)
{
struct cifs_credits *credits = &subreq->credits;
int new_val = DIV_ROUND_UP(subreq->subreq.len, SMB2_MAX_BUFFER_SIZE);
int new_val = DIV_ROUND_UP(subreq->actual_len, SMB2_MAX_BUFFER_SIZE);
int scredits, in_flight;
if (!credits->value || credits->value == new_val)
@ -3237,13 +3237,15 @@ static long smb3_zero_data(struct file *file, struct cifs_tcon *tcon,
}
static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
loff_t offset, loff_t len, bool keep_size)
unsigned long long offset, unsigned long long len,
bool keep_size)
{
struct cifs_ses *ses = tcon->ses;
struct inode *inode = file_inode(file);
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct cifsFileInfo *cfile = file->private_data;
unsigned long long new_size;
struct netfs_inode *ictx = netfs_inode(inode);
unsigned long long i_size, new_size, remote_size;
long rc;
unsigned int xid;
@ -3255,6 +3257,16 @@ static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
inode_lock(inode);
filemap_invalidate_lock(inode->i_mapping);
i_size = i_size_read(inode);
remote_size = ictx->remote_i_size;
if (offset + len >= remote_size && offset < i_size) {
unsigned long long top = umin(offset + len, i_size);
rc = filemap_write_and_wait_range(inode->i_mapping, offset, top - 1);
if (rc < 0)
goto zero_range_exit;
}
/*
* We zero the range through ioctl, so we need remove the page caches
* first, otherwise the data may be inconsistent with the server.

41
fs/smb/client/smb2pdu.c
View File

@ -4507,6 +4507,7 @@ static void
smb2_readv_callback(struct mid_q_entry *mid)
{
struct cifs_io_subrequest *rdata = mid->callback_data;
struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
struct TCP_Server_Info *server = rdata->server;
struct smb2_hdr *shdr =
@ -4529,9 +4530,9 @@ smb2_readv_callback(struct mid_q_entry *mid)
"rdata server %p != mid server %p",
rdata->server, mid->server);
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu\n",
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
__func__, mid->mid, mid->mid_state, rdata->result,
rdata->subreq.len);
rdata->actual_len, rdata->subreq.len - rdata->subreq.transferred);
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
@ -4585,22 +4586,29 @@ smb2_readv_callback(struct mid_q_entry *mid)
rdata->subreq.debug_index,
rdata->xid,
rdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid, rdata->subreq.start,
rdata->subreq.len, rdata->result);
tcon->tid, tcon->ses->Suid,
rdata->subreq.start + rdata->subreq.transferred,
rdata->actual_len,
rdata->result);
} else
trace_smb3_read_done(rdata->rreq->debug_id,
rdata->subreq.debug_index,
rdata->xid,
rdata->req->cfile->fid.persistent_fid,
tcon->tid, tcon->ses->Suid,
rdata->subreq.start, rdata->got_bytes);
rdata->subreq.start + rdata->subreq.transferred,
rdata->got_bytes);
if (rdata->result == -ENODATA) {
/* We may have got an EOF error because fallocate
* failed to enlarge the file.
*/
if (rdata->subreq.start < rdata->subreq.rreq->i_size)
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
} else {
if (rdata->got_bytes < rdata->actual_len &&
rdata->subreq.start + rdata->subreq.transferred + rdata->got_bytes ==
ictx->remote_i_size) {
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
}
}
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
server->credits, server->in_flight,
@ -4621,6 +4629,7 @@ smb2_async_readv(struct cifs_io_subrequest *rdata)
{
int rc, flags = 0;
char *buf;
struct netfs_io_subrequest *subreq = &rdata->subreq;
struct smb2_hdr *shdr;
struct cifs_io_parms io_parms;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
@ -4631,15 +4640,15 @@ smb2_async_readv(struct cifs_io_subrequest *rdata)
int credit_request;
cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
__func__, rdata->subreq.start, rdata->subreq.len);
__func__, subreq->start, subreq->len);
if (!rdata->server)
rdata->server = cifs_pick_channel(tcon->ses);
io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
io_parms.server = server = rdata->server;
io_parms.offset = rdata->subreq.start;
io_parms.length = rdata->subreq.len;
io_parms.offset = subreq->start + subreq->transferred;
io_parms.length = rdata->actual_len;
io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
io_parms.pid = rdata->req->pid;
@ -4654,11 +4663,13 @@ smb2_async_readv(struct cifs_io_subrequest *rdata)
rdata->iov[0].iov_base = buf;
rdata->iov[0].iov_len = total_len;
rdata->got_bytes = 0;
rdata->result = 0;
shdr = (struct smb2_hdr *)buf;
if (rdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->subreq.len,
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->actual_len,
SMB2_MAX_BUFFER_SIZE));
credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
if (server->credits >= server->max_credits)
@ -4682,11 +4693,11 @@ smb2_async_readv(struct cifs_io_subrequest *rdata)
if (rc) {
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
trace_smb3_read_err(rdata->rreq->debug_id,
rdata->subreq.debug_index,
subreq->debug_index,
rdata->xid, io_parms.persistent_fid,
io_parms.tcon->tid,
io_parms.tcon->ses->Suid,
io_parms.offset, io_parms.length, rc);
io_parms.offset, rdata->actual_len, rc);
}
async_readv_out:

1
fs/smb/client/trace.h
View File

@ -30,6 +30,7 @@
EM(cifs_trace_rw_credits_old_session, "old-session") \
EM(cifs_trace_rw_credits_read_response_add, "rd-resp-add") \
EM(cifs_trace_rw_credits_read_response_clear, "rd-resp-clr") \
EM(cifs_trace_rw_credits_read_resubmit, "rd-resubmit") \
EM(cifs_trace_rw_credits_read_submit, "rd-submit ") \
EM(cifs_trace_rw_credits_write_prepare, "wr-prepare ") \
EM(cifs_trace_rw_credits_write_response_add, "wr-resp-add") \

1
include/linux/netfs.h
View File

@ -198,6 +198,7 @@ struct netfs_io_subrequest {
#define NETFS_SREQ_NEED_RETRY 9 /* Set if the filesystem requests a retry */
#define NETFS_SREQ_RETRYING 10 /* Set if we're retrying */
#define NETFS_SREQ_FAILED 11 /* Set if the subreq failed unretryably */
#define NETFS_SREQ_HIT_EOF 12 /* Set if we hit the EOF */
};
enum netfs_io_origin {