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Message-ID: <153685392069.14766.2190371088829334996.stgit@warthog.procyon.org.uk>
Date: Thu, 13 Sep 2018 16:52:00 +0100
From: David Howells <dhowells@...hat.com>
To: viro@...iv.linux.org.uk
Cc: dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 03/10] iov_iter: Make count and iov_offset loff_t not size_t
Make count and iov_offset loff_t not size_t so that they can handle
transactions larger than 4GiB in size and starting at 4GiB or more into a
file on a 32-bit system.
On a 64-bit system, this should make no difference.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/btrfs/file.c | 7 ++++---
fs/nfs/direct.c | 2 +-
include/linux/uio.h | 4 ++--
lib/iov_iter.c | 14 +++++++-------
net/9p/client.c | 2 +-
5 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 2be00e873e92..cdf3149a5871 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1596,9 +1596,10 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb,
while (iov_iter_count(i) > 0) {
size_t offset = pos & (PAGE_SIZE - 1);
size_t sector_offset;
- size_t write_bytes = min(iov_iter_count(i),
- nrptrs * (size_t)PAGE_SIZE -
- offset);
+ size_t write_bytes = min_t(size_t,
+ iov_iter_count(i),
+ nrptrs * (size_t)PAGE_SIZE -
+ offset);
size_t num_pages = DIV_ROUND_UP(write_bytes + offset,
PAGE_SIZE);
size_t reserve_bytes;
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index aa12c3063bae..6550e712b063 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -974,7 +974,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
struct nfs_lock_context *l_ctx;
loff_t pos, end;
- dfprintk(FILE, "NFS: direct write(%pD2, %zd@%Ld)\n",
+ dfprintk(FILE, "NFS: direct write(%pD2, %zu@...d)\n",
file, iov_iter_count(iter), (long long) iocb->ki_pos);
result = generic_write_checks(iocb, iter);
diff --git a/include/linux/uio.h b/include/linux/uio.h
index d5f8755bf778..1e03cb50a0e0 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -31,7 +31,7 @@ enum iter_type {
struct iov_iter {
enum iter_type iter_type:8;
u8 iter_dir;
- size_t iov_offset;
+ loff_t iov_offset;
size_t count;
union {
const struct iovec *iov;
@@ -89,7 +89,7 @@ static inline struct iovec iov_iter_iovec(const struct iov_iter *iter)
{
return (struct iovec) {
.iov_base = iter->iov->iov_base + iter->iov_offset,
- .iov_len = min(iter->count,
+ .iov_len = min_t(size_t, iter->count,
iter->iov->iov_len - iter->iov_offset),
};
}
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f30ecd263d6e..8231f0e38f20 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -13,7 +13,7 @@
size_t left; \
size_t wanted = n; \
__p = i->iov; \
- __v.iov_len = min(n, __p->iov_len - skip); \
+ __v.iov_len = min_t(size_t, n, __p->iov_len - skip); \
if (likely(__v.iov_len)) { \
__v.iov_base = __p->iov_base + skip; \
left = (STEP); \
@@ -40,7 +40,7 @@
#define iterate_kvec(i, n, __v, __p, skip, STEP) { \
size_t wanted = n; \
__p = i->kvec; \
- __v.iov_len = min(n, __p->iov_len - skip); \
+ __v.iov_len = min_t(size_t, n, __p->iov_len - skip); \
if (likely(__v.iov_len)) { \
__v.iov_base = __p->iov_base + skip; \
(void)(STEP); \
@@ -74,7 +74,7 @@
#define iterate_all_kinds(i, n, v, I, B, K) { \
if (likely(n)) { \
- size_t skip = i->iov_offset; \
+ loff_t skip = i->iov_offset; \
switch (iov_iter_type(i)) { \
case ITER_BVEC: { \
struct bio_vec v; \
@@ -105,7 +105,7 @@
if (unlikely(i->count < n)) \
n = i->count; \
if (i->count) { \
- size_t skip = i->iov_offset; \
+ loff_t skip = i->iov_offset; \
switch (iov_iter_type(i)) { \
case ITER_BVEC: { \
const struct bio_vec *bvec = i->bvec; \
@@ -358,7 +358,7 @@ static bool sanity(const struct iov_iter *i)
}
return true;
Bad:
- printk(KERN_ERR "idx = %d, offset = %zd\n", i->idx, i->iov_offset);
+ printk(KERN_ERR "idx = %d, offset = %lld\n", i->idx, i->iov_offset);
printk(KERN_ERR "curbuf = %d, nrbufs = %d, buffers = %d\n",
pipe->curbuf, pipe->nrbufs, pipe->buffers);
for (idx = 0; idx < pipe->buffers; idx++)
@@ -1105,10 +1105,10 @@ size_t iov_iter_single_seg_count(const struct iov_iter *i)
case ITER_PIPE:
return i->count; // it is a silly place, anyway
case ITER_BVEC:
- return min(i->count, i->bvec->bv_len - i->iov_offset);
+ return min_t(size_t, i->count, i->bvec->bv_len - i->iov_offset);
case ITER_KVEC:
case ITER_IOVEC:
- return min(i->count, i->iov->iov_len - i->iov_offset);
+ return min_t(size_t, i->count, i->iov->iov_len - i->iov_offset);
}
BUG();
}
diff --git a/net/9p/client.c b/net/9p/client.c
index a9cd1401bd09..10f74bd027dd 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1631,7 +1631,7 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
int total = 0;
*err = 0;
- p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
+ p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zu\n",
fid->fid, (unsigned long long) offset,
iov_iter_count(from));
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