[PATCH v2 13/22] netfs: Switch to using unsigned long long rather than loff_t

David Howells
2024-04-30T14:02:16Z

Switch to using unsigned long long rather than loff_t in netfslib to avoid
problems with the sign flipping in the maths when we're dealing with the
byte at position 0x7fffffffffffffff.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: Xiubo Li <xiubli@redhat.com>
cc: netfs@lists.linux.dev
cc: ceph-devel@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
---
fs/cachefiles/io.c | 2 +-
fs/ceph/addr.c | 2 +-
fs/netfs/buffered_read.c | 4 +++-
fs/netfs/buffered_write.c | 2 +-
fs/netfs/io.c | 6 +++---
fs/netfs/main.c | 2 +-
fs/netfs/output.c | 4 ++--
include/linux/netfs.h | 16 +++++++++-------
include/trace/events/netfs.h | 6 +++---
9 files changed, 24 insertions(+), 20 deletions(-)

diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index 1d685357e67f..5ba5c7814fe4 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -493,7 +493,7 @@ cachefiles_do_prepare_read(struct netfs_cache_resources *cres,
* boundary as appropriate.
*/
static enum netfs_io_source cachefiles_prepare_read(struct netfs_io_subrequest *subreq,
- loff_t i_size)
+ unsigned long long i_size)
{
return cachefiles_do_prepare_read(&subreq->rreq->cache_resources,
subreq->start, &subreq->len, i_size,
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 74bfd10b1b1a..8c16bc5250ef 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -193,7 +193,7 @@ static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
* block, but do not exceed the file size, unless the original
* request already exceeds it.
*/
- new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
+ new_end = umin(round_up(end, lo->stripe_unit), rreq->i_size);
if (new_end > end && new_end <= rreq->start + max_len)
rreq->len = new_end - rreq->start;

diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c
index 1622cce535a3..47603f08680e 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -130,7 +130,9 @@ void netfs_rreq_unlock_folios(struct netfs_io_request *rreq)
}

static void netfs_cache_expand_readahead(struct netfs_io_request *rreq,
- loff_t *_start, size_t *_len, loff_t i_size)
+ unsigned long long *_start,
+ unsigned long long *_len,
+ unsigned long long i_size)
{
struct netfs_cache_resources *cres = &rreq->cache_resources;

diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index d8f66ce94575..eba49bfafe64 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -664,7 +664,7 @@ static void netfs_pages_written_back(struct netfs_io_request *wreq)
last = (wreq->start + wreq->len - 1) / PAGE_SIZE;
xas_for_each(&xas, folio, last) {
WARN(!folio_test_writeback(folio),
- "bad %zx @%llx page %lx %lx\n",
+ "bad %llx @%llx page %lx %lx\n",
wreq->len, wreq->start, folio->index, last);

if ((finfo = netfs_folio_info(folio))) {
diff --git a/fs/netfs/io.c b/fs/netfs/io.c
index 8de581ac0cfb..6cfecfcd02e1 100644
--- a/fs/netfs/io.c
+++ b/fs/netfs/io.c
@@ -476,7 +476,7 @@ netfs_rreq_prepare_read(struct netfs_io_request *rreq,

set:
if (subreq->len > rreq->len)
- pr_warn("R=%08x[%u] SREQ>RREQ %zx > %zx\n",
+ pr_warn("R=%08x[%u] SREQ>RREQ %zx > %llx\n",
rreq->debug_id, subreq->debug_index,
subreq->len, rreq->len);

@@ -513,7 +513,7 @@ static bool netfs_rreq_submit_slice(struct netfs_io_request *rreq,
subreq->start = rreq->start + rreq->submitted;
subreq->len = io_iter->count;

- _debug("slice %llx,%zx,%zx", subreq->start, subreq->len, rreq->submitted);
+ _debug("slice %llx,%zx,%llx", subreq->start, subreq->len, rreq->submitted);
list_add_tail(&subreq->rreq_link, &rreq->subrequests);

/* Call out to the cache to find out what it can do with the remaining
@@ -588,7 +588,7 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync)
atomic_set(&rreq->nr_outstanding, 1);
io_iter = rreq->io_iter;
do {
- _debug("submit %llx + %zx >= %llx",
+ _debug("submit %llx + %llx >= %llx",
rreq->start, rreq->submitted, rreq->i_size);
if (rreq->origin == NETFS_DIO_READ &&
rreq->start + rreq->submitted >= rreq->i_size)
diff --git a/fs/netfs/main.c b/fs/netfs/main.c
index 4805b9377364..5f0f438e5d21 100644
--- a/fs/netfs/main.c
+++ b/fs/netfs/main.c
@@ -62,7 +62,7 @@ static int netfs_requests_seq_show(struct seq_file *m, void *v)

rreq = list_entry(v, struct netfs_io_request, proc_link);
seq_printf(m,
- "%08x %s %3d %2lx %4d %3d @%04llx %zx/%zx",
+ "%08x %s %3d %2lx %4d %3d @%04llx %llx/%llx",
rreq->debug_id,
netfs_origins[rreq->origin],
refcount_read(&rreq->ref),
diff --git a/fs/netfs/output.c b/fs/netfs/output.c
index e586396d6b72..85374322f10f 100644
--- a/fs/netfs/output.c
+++ b/fs/netfs/output.c
@@ -439,7 +439,7 @@ static void netfs_submit_writethrough(struct netfs_io_request *wreq, bool final)
*/
int netfs_advance_writethrough(struct netfs_io_request *wreq, size_t copied, bool to_page_end)
{
- _enter("ic=%zu sb=%zu ws=%u cp=%zu tp=%u",
+ _enter("ic=%zu sb=%llu ws=%u cp=%zu tp=%u",
wreq->iter.count, wreq->submitted, wreq->wsize, copied, to_page_end);

wreq->iter.count += copied;
@@ -457,7 +457,7 @@ int netfs_end_writethrough(struct netfs_io_request *wreq, struct kiocb *iocb)
{
int ret = -EIOCBQUEUED;

- _enter("ic=%zu sb=%zu ws=%u",
+ _enter("ic=%zu sb=%llu ws=%u",
wreq->iter.count, wreq->submitted, wreq->wsize);

if (wreq->submitted < wreq->io_iter.count)
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index 0b6c2c2d3c23..88269681d4fc 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -149,7 +149,7 @@ struct netfs_io_subrequest {
struct work_struct work;
struct list_head rreq_link; /* Link in rreq->subrequests */
struct iov_iter io_iter; /* Iterator for this subrequest */
- loff_t start; /* Where to start the I/O */
+ unsigned long long start; /* Where to start the I/O */
size_t len; /* Size of the I/O */
size_t transferred; /* Amount of data transferred */
refcount_t ref;
@@ -205,15 +205,15 @@ struct netfs_io_request {
atomic_t subreq_counter; /* Next subreq->debug_index */
atomic_t nr_outstanding; /* Number of ops in progress */
atomic_t nr_copy_ops; /* Number of copy-to-cache ops in progress */
- size_t submitted; /* Amount submitted for I/O so far */
- size_t len; /* Length of the request */
size_t upper_len; /* Length can be extended to here */
+ unsigned long long submitted; /* Amount submitted for I/O so far */
+ unsigned long long len; /* Length of the request */
size_t transferred; /* Amount to be indicated as transferred */
short error; /* 0 or error that occurred */
enum netfs_io_origin origin; /* Origin of the request */
bool direct_bv_unpin; /* T if direct_bv[] must be unpinned */
- loff_t i_size; /* Size of the file */
- loff_t start; /* Start position */
+ unsigned long long i_size; /* Size of the file */
+ unsigned long long start; /* Start position */
pgoff_t no_unlock_folio; /* Don't unlock this folio after read */
refcount_t ref;
unsigned long flags;
@@ -294,13 +294,15 @@ struct netfs_cache_ops {

/* Expand readahead request */
void (*expand_readahead)(struct netfs_cache_resources *cres,
- loff_t *_start, size_t *_len, loff_t i_size);
+ unsigned long long *_start,
+ unsigned long long *_len,
+ unsigned long long i_size);

/* Prepare a read operation, shortening it to a cached/uncached
* boundary as appropriate.
*/
enum netfs_io_source (*prepare_read)(struct netfs_io_subrequest *subreq,
- loff_t i_size);
+ unsigned long long i_size);

/* Prepare a write operation, working out what part of the write we can
* actually do.
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 30769103638f..7126d2ea459c 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -280,7 +280,7 @@ TRACE_EVENT(netfs_sreq,
__entry->start = sreq->start;
),

- TP_printk("R=%08x[%u] %s %s f=%02x s=%llx %zx/%zx e=%d",
+ TP_printk("R=%08x[%x] %s %s f=%02x s=%llx %zx/%zx e=%d",
__entry->rreq, __entry->index,
__print_symbolic(__entry->source, netfs_sreq_sources),
__print_symbolic(__entry->what, netfs_sreq_traces),
@@ -320,7 +320,7 @@ TRACE_EVENT(netfs_failure,
__entry->start = sreq ? sreq->start : 0;
),

- TP_printk("R=%08x[%d] %s f=%02x s=%llx %zx/%zx %s e=%d",
+ TP_printk("R=%08x[%x] %s f=%02x s=%llx %zx/%zx %s e=%d",
__entry->rreq, __entry->index,
__print_symbolic(__entry->source, netfs_sreq_sources),
__entry->flags,
@@ -436,7 +436,7 @@ TRACE_EVENT(netfs_write,
__field(unsigned int, cookie )
__field(enum netfs_write_trace, what )
__field(unsigned long long, start )
- __field(size_t, len )
+ __field(unsigned long long, len )
),

TP_fast_assign(