[RFC PATCH 43/53] cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest

From: David Howells
Date: Fri Oct 13 2023 - 12:28:38 EST

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Netfslib has a facility whereby the allocation for netfs_io_subrequest can
be increased to so that filesystem-specific data can be tagged on the end.

Prepare to use this by making a struct, cifs_io_subrequest, that wraps
netfs_io_subrequest, and absorb struct cifs_readdata into it.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Steve French <sfrench@xxxxxxxxx>
cc: Shyam Prasad N <nspmangalore@xxxxxxxxx>
cc: Rohith Surabattula <rohiths.msft@xxxxxxxxx>
cc: Jeff Layton <jlayton@xxxxxxxxxx>
cc: linux-cifs@xxxxxxxxxxxxxxx
cc: linux-cachefs@xxxxxxxxxx
cc: linux-fsdevel@xxxxxxxxxxxxxxx
cc: linux-mm@xxxxxxxxx
---
fs/smb/client/cifsglob.h | 22 ++++++++++--------
fs/smb/client/cifsproto.h | 9 ++++++--
fs/smb/client/cifssmb.c | 11 ++++-----
fs/smb/client/file.c | 48 ++++++++++++++++++---------------------
fs/smb/client/smb2ops.c | 2 +-
fs/smb/client/smb2pdu.c | 13 ++++++-----
fs/smb/client/smb2proto.h | 2 +-
fs/smb/client/transport.c | 4 ++--
8 files changed, 56 insertions(+), 55 deletions(-)

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 02082621d8e0..22fa98428845 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -237,7 +237,7 @@ struct dfs_info3_param;
struct cifs_fattr;
struct smb3_fs_context;
struct cifs_fid;
-struct cifs_readdata;
+struct cifs_io_subrequest;
struct cifs_writedata;
struct cifs_io_parms;
struct cifs_search_info;
@@ -411,7 +411,7 @@ struct smb_version_operations {
/* send a flush request to the server */
int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *);
/* async read from the server */
- int (*async_readv)(struct cifs_readdata *);
+ int (*async_readv)(struct cifs_io_subrequest *);
/* async write to the server */
int (*async_writev)(struct cifs_writedata *,
void (*release)(struct kref *));
@@ -1423,26 +1423,28 @@ struct cifs_aio_ctx {
};

/* asynchronous read support */
-struct cifs_readdata {
- struct kref refcount;
- struct list_head list;
- struct completion done;
+struct cifs_io_subrequest {
+ struct netfs_io_subrequest subreq;
struct cifsFileInfo *cfile;
struct address_space *mapping;
struct cifs_aio_ctx *ctx;
- __u64 offset;
ssize_t got_bytes;
- unsigned int bytes;
pid_t pid;
int result;
- struct work_struct work;
- struct iov_iter iter;
struct kvec iov[2];
struct TCP_Server_Info *server;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
#endif
struct cifs_credits credits;
+
+ // TODO: Remove following elements
+ struct list_head list;
+ struct completion done;
+ struct work_struct work;
+ struct iov_iter iter;
+ __u64 offset;
+ unsigned int bytes;
};

/* asynchronous write support */
diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h
index 0c37eefa18a5..7748fe148fb4 100644
--- a/fs/smb/client/cifsproto.h
+++ b/fs/smb/client/cifsproto.h
@@ -580,8 +580,13 @@ void __cifs_put_smb_ses(struct cifs_ses *ses);
extern struct cifs_ses *
cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx);

-void cifs_readdata_release(struct kref *refcount);
-int cifs_async_readv(struct cifs_readdata *rdata);
+void cifs_readdata_release(struct cifs_io_subrequest *rdata);
+static inline void cifs_put_readdata(struct cifs_io_subrequest *rdata)
+{
+ if (refcount_dec_and_test(&rdata->subreq.ref))
+ cifs_readdata_release(rdata);
+}
+int cifs_async_readv(struct cifs_io_subrequest *rdata);
int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid);

int cifs_async_writev(struct cifs_writedata *wdata,
diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index 25503f1a4fd2..76005b3d5ffe 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -24,6 +24,8 @@
#include <linux/swap.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uaccess.h>
+#include <linux/netfs.h>
+#include <trace/events/netfs.h>
#include "cifspdu.h"
#include "cifsfs.h"
#include "cifsglob.h"
@@ -1260,12 +1262,11 @@ CIFS_open(const unsigned int xid, struct cifs_open_parms *oparms, int *oplock,
static void
cifs_readv_callback(struct mid_q_entry *mid)
{
- struct cifs_readdata *rdata = mid->callback_data;
+ struct cifs_io_subrequest *rdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
.rq_nvec = 2,
- .rq_iter_size = iov_iter_count(&rdata->iter),
.rq_iter = rdata->iter };
struct cifs_credits credits = { .value = 1, .instance = 0 };

@@ -1310,7 +1311,7 @@ cifs_readv_callback(struct mid_q_entry *mid)

/* cifs_async_readv - send an async write, and set up mid to handle result */
int
-cifs_async_readv(struct cifs_readdata *rdata)
+cifs_async_readv(struct cifs_io_subrequest *rdata)
{
int rc;
READ_REQ *smb = NULL;
@@ -1362,15 +1363,11 @@ cifs_async_readv(struct cifs_readdata *rdata)
rdata->iov[1].iov_base = (char *)smb + 4;
rdata->iov[1].iov_len = get_rfc1002_length(smb);

- kref_get(&rdata->refcount);
rc = cifs_call_async(tcon->ses->server, &rqst, cifs_readv_receive,
cifs_readv_callback, NULL, rdata, 0, NULL);

if (rc == 0)
cifs_stats_inc(&tcon->stats.cifs_stats.num_reads);
- else
- kref_put(&rdata->refcount, cifs_readdata_release);
-
cifs_small_buf_release(smb);
return rc;
}
diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index 2108b3b40ce9..b4f16ef62115 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -2950,7 +2950,7 @@ static int cifs_writepages_region(struct address_space *mapping,
continue;
}

- folio_batch_release(&fbatch);
+ folio_batch_release(&fbatch);
cond_resched();
} while (wbc->nr_to_write > 0);

@@ -3784,13 +3784,13 @@ cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from)
return written;
}

-static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete)
+static struct cifs_io_subrequest *cifs_readdata_alloc(work_func_t complete)
{
- struct cifs_readdata *rdata;
+ struct cifs_io_subrequest *rdata;

rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
if (rdata) {
- kref_init(&rdata->refcount);
+ refcount_set(&rdata->subreq.ref, 1);
INIT_LIST_HEAD(&rdata->list);
init_completion(&rdata->done);
INIT_WORK(&rdata->work, complete);
@@ -3800,11 +3800,8 @@ static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete)
}

void
-cifs_readdata_release(struct kref *refcount)
+cifs_readdata_release(struct cifs_io_subrequest *rdata)
{
- struct cifs_readdata *rdata = container_of(refcount,
- struct cifs_readdata, refcount);
-
if (rdata->ctx)
kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
#ifdef CONFIG_CIFS_SMB_DIRECT
@@ -3824,16 +3821,16 @@ static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
static void
cifs_uncached_readv_complete(struct work_struct *work)
{
- struct cifs_readdata *rdata = container_of(work,
- struct cifs_readdata, work);
+ struct cifs_io_subrequest *rdata =
+ container_of(work, struct cifs_io_subrequest, work);

complete(&rdata->done);
collect_uncached_read_data(rdata->ctx);
/* the below call can possibly free the last ref to aio ctx */
- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
}

-static int cifs_resend_rdata(struct cifs_readdata *rdata,
+static int cifs_resend_rdata(struct cifs_io_subrequest *rdata,
struct list_head *rdata_list,
struct cifs_aio_ctx *ctx)
{
@@ -3901,7 +3898,7 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
} while (rc == -EAGAIN);

fail:
- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
return rc;
}

@@ -3910,7 +3907,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
struct cifs_aio_ctx *ctx)
{
- struct cifs_readdata *rdata;
+ struct cifs_io_subrequest *rdata;
unsigned int rsize, nsegs, max_segs = INT_MAX;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
@@ -3978,7 +3975,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
rdata->ctx = ctx;
kref_get(&ctx->refcount);

- rdata->iter = ctx->iter;
+ rdata->iter = ctx->iter;
iov_iter_truncate(&rdata->iter, cur_len);

rc = adjust_credits(server, &rdata->credits, rdata->bytes);
@@ -3992,7 +3989,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,

if (rc) {
add_credits_and_wake_if(server, &rdata->credits, 0);
- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
if (rc == -EAGAIN)
continue;
break;
@@ -4010,7 +4007,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
static void
collect_uncached_read_data(struct cifs_aio_ctx *ctx)
{
- struct cifs_readdata *rdata, *tmp;
+ struct cifs_io_subrequest *rdata, *tmp;
struct cifs_sb_info *cifs_sb;
int rc;

@@ -4056,8 +4053,7 @@ collect_uncached_read_data(struct cifs_aio_ctx *ctx)
rdata->cfile, cifs_sb,
&tmp_list, ctx);

- kref_put(&rdata->refcount,
- cifs_readdata_release);
+ cifs_put_readdata(rdata);
}

list_splice(&tmp_list, &ctx->list);
@@ -4073,7 +4069,7 @@ collect_uncached_read_data(struct cifs_aio_ctx *ctx)
ctx->total_len += rdata->got_bytes;
}
list_del_init(&rdata->list);
- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
}

/* mask nodata case */
@@ -4445,8 +4441,8 @@ static void cifs_unlock_folios(struct address_space *mapping, pgoff_t first, pgo

static void cifs_readahead_complete(struct work_struct *work)
{
- struct cifs_readdata *rdata = container_of(work,
- struct cifs_readdata, work);
+ struct cifs_io_subrequest *rdata = container_of(work,
+ struct cifs_io_subrequest, work);
struct folio *folio;
pgoff_t last;
bool good = rdata->result == 0 || (rdata->result == -EAGAIN && rdata->got_bytes);
@@ -4472,7 +4468,7 @@ static void cifs_readahead_complete(struct work_struct *work)
}
rcu_read_unlock();

- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
}

static void cifs_readahead(struct readahead_control *ractl)
@@ -4512,7 +4508,7 @@ static void cifs_readahead(struct readahead_control *ractl)
*/
while ((nr_pages = ra_pages)) {
unsigned int i, rsize;
- struct cifs_readdata *rdata;
+ struct cifs_io_subrequest *rdata;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
struct folio *folio;
@@ -4631,11 +4627,11 @@ static void cifs_readahead(struct readahead_control *ractl)
rdata->offset / PAGE_SIZE,
(rdata->offset + rdata->bytes - 1) / PAGE_SIZE);
/* Fallback to the readpage in error/reconnect cases */
- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
break;
}

- kref_put(&rdata->refcount, cifs_readdata_release);
+ cifs_put_readdata(rdata);
}

free_xid(xid);
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 9aeecee6b91b..dc18130db9b3 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -4584,7 +4584,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
unsigned int cur_off;
unsigned int cur_page_idx;
unsigned int pad_len;
- struct cifs_readdata *rdata = mid->callback_data;
+ struct cifs_io_subrequest *rdata = mid->callback_data;
struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
int length;
bool use_rdma_mr = false;
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index c75a80bb6d9e..cc3d80a66869 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -23,6 +23,8 @@
#include <linux/uuid.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
+#include <linux/netfs.h>
+#include <trace/events/netfs.h>
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
@@ -4070,7 +4072,7 @@ static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
*/
static int
smb2_new_read_req(void **buf, unsigned int *total_len,
- struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
+ struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
unsigned int remaining_bytes, int request_type)
{
int rc = -EACCES;
@@ -4162,13 +4164,14 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
static void
smb2_readv_callback(struct mid_q_entry *mid)
{
- struct cifs_readdata *rdata = mid->callback_data;
+ struct cifs_io_subrequest *rdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
struct TCP_Server_Info *server = rdata->server;
struct smb2_hdr *shdr =
(struct smb2_hdr *)rdata->iov[0].iov_base;
struct cifs_credits credits = { .value = 0, .instance = 0 };
- struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
+ struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
+ .rq_nvec = 1 };

if (rdata->got_bytes) {
rqst.rq_iter = rdata->iter;
@@ -4249,7 +4252,7 @@ smb2_readv_callback(struct mid_q_entry *mid)

/* smb2_async_readv - send an async read, and set up mid to handle result */
int
-smb2_async_readv(struct cifs_readdata *rdata)
+smb2_async_readv(struct cifs_io_subrequest *rdata)
{
int rc, flags = 0;
char *buf;
@@ -4307,13 +4310,11 @@ smb2_async_readv(struct cifs_readdata *rdata)
flags |= CIFS_HAS_CREDITS;
}

- kref_get(&rdata->refcount);
rc = cifs_call_async(server, &rqst,
cifs_readv_receive, smb2_readv_callback,
smb3_handle_read_data, rdata, flags,
&rdata->credits);
if (rc) {
- kref_put(&rdata->refcount, cifs_readdata_release);
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
io_parms.tcon->tid,
diff --git a/fs/smb/client/smb2proto.h b/fs/smb/client/smb2proto.h
index 46eff9ec302a..02ffe5ec9b21 100644
--- a/fs/smb/client/smb2proto.h
+++ b/fs/smb/client/smb2proto.h
@@ -186,7 +186,7 @@ extern int SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
extern int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
__le64 *uniqueid);
-extern int smb2_async_readv(struct cifs_readdata *rdata);
+extern int smb2_async_readv(struct cifs_io_subrequest *rdata);
extern int SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, char **buf, int *buf_type);
extern int smb2_async_writev(struct cifs_writedata *wdata,
diff --git a/fs/smb/client/transport.c b/fs/smb/client/transport.c
index 14710afdc2a3..16d87867ef50 100644
--- a/fs/smb/client/transport.c
+++ b/fs/smb/client/transport.c
@@ -1686,7 +1686,7 @@ __cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid,
static int
cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
- struct cifs_readdata *rdata = mid->callback_data;
+ struct cifs_io_subrequest *rdata = mid->callback_data;

return __cifs_readv_discard(server, mid, rdata->result);
}
@@ -1696,7 +1696,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length, len;
unsigned int data_offset, data_len;
- struct cifs_readdata *rdata = mid->callback_data;
+ struct cifs_io_subrequest *rdata = mid->callback_data;
char *buf = server->smallbuf;
unsigned int buflen = server->pdu_size + HEADER_PREAMBLE_SIZE(server);
bool use_rdma_mr = false;

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