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iomap: constify iomap_iter_srcmap

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The srcmap returned from iomap_iter_srcmap is never modified, so mark
the iomap returned from it const and constify a lot of code that never
modifies the iomap.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-08-10 18:33:16 -07:00 committed by Darrick J. Wong
parent 65dd814a61
commit fad0a1ab34
2 changed files with 20 additions and 20 deletions
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38
fs/iomap/buffered-io.c
View File

@ -205,10 +205,10 @@ struct iomap_readpage_ctx {
struct readahead_control *rac;
};
static loff_t iomap_read_inline_data(struct iomap_iter *iter,
static loff_t iomap_read_inline_data(const struct iomap_iter *iter,
struct page *page)
{
struct iomap *iomap = iomap_iter_srcmap(iter);
const struct iomap *iomap = iomap_iter_srcmap(iter);
size_t size = i_size_read(iter->inode) - iomap->offset;
size_t poff = offset_in_page(iomap->offset);
void *addr;
@ -234,20 +234,20 @@ static loff_t iomap_read_inline_data(struct iomap_iter *iter,
return PAGE_SIZE - poff;
}
static inline bool iomap_block_needs_zeroing(struct iomap_iter *iter,
static inline bool iomap_block_needs_zeroing(const struct iomap_iter *iter,
loff_t pos)
{
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
return srcmap->type != IOMAP_MAPPED ||
(srcmap->flags & IOMAP_F_NEW) ||
pos >= i_size_read(iter->inode);
}
static loff_t iomap_readpage_iter(struct iomap_iter *iter,
static loff_t iomap_readpage_iter(const struct iomap_iter *iter,
struct iomap_readpage_ctx *ctx, loff_t offset)
{
struct iomap *iomap = &iter->iomap;
const struct iomap *iomap = &iter->iomap;
loff_t pos = iter->pos + offset;
loff_t length = iomap_length(iter) - offset;
struct page *page = ctx->cur_page;
@ -352,7 +352,7 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops)
}
EXPORT_SYMBOL_GPL(iomap_readpage);
static loff_t iomap_readahead_iter(struct iomap_iter *iter,
static loff_t iomap_readahead_iter(const struct iomap_iter *iter,
struct iomap_readpage_ctx *ctx)
{
loff_t length = iomap_length(iter);
@ -536,10 +536,10 @@ iomap_read_page_sync(loff_t block_start, struct page *page, unsigned poff,
return submit_bio_wait(&bio);
}
static int __iomap_write_begin(struct iomap_iter *iter, loff_t pos,
static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
unsigned len, struct page *page)
{
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
struct iomap_page *iop = iomap_page_create(iter->inode, page);
loff_t block_size = i_blocksize(iter->inode);
loff_t block_start = round_down(pos, block_size);
@ -577,7 +577,7 @@ static int __iomap_write_begin(struct iomap_iter *iter, loff_t pos,
return 0;
}
static int iomap_write_begin_inline(struct iomap_iter *iter,
static int iomap_write_begin_inline(const struct iomap_iter *iter,
struct page *page)
{
int ret;
@ -591,11 +591,11 @@ static int iomap_write_begin_inline(struct iomap_iter *iter,
return 0;
}
static int iomap_write_begin(struct iomap_iter *iter, loff_t pos, unsigned len,
struct page **pagep)
static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
unsigned len, struct page **pagep)
{
const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
struct page *page;
int status = 0;
@ -666,10 +666,10 @@ static size_t __iomap_write_end(struct inode *inode, loff_t pos, size_t len,
return copied;
}
static size_t iomap_write_end_inline(struct iomap_iter *iter, struct page *page,
loff_t pos, size_t copied)
static size_t iomap_write_end_inline(const struct iomap_iter *iter,
struct page *page, loff_t pos, size_t copied)
{
struct iomap *iomap = &iter->iomap;
const struct iomap *iomap = &iter->iomap;
void *addr;
WARN_ON_ONCE(!PageUptodate(page));
@ -689,7 +689,7 @@ static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
size_t copied, struct page *page)
{
const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
loff_t old_size = iter->inode->i_size;
size_t ret;
@ -814,7 +814,7 @@ EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
static loff_t iomap_unshare_iter(struct iomap_iter *iter)
{
struct iomap *iomap = &iter->iomap;
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
loff_t pos = iter->pos;
loff_t length = iomap_length(iter);
long status = 0;
@ -890,7 +890,7 @@ static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
{
struct iomap *iomap = &iter->iomap;
struct iomap *srcmap = iomap_iter_srcmap(iter);
const struct iomap *srcmap = iomap_iter_srcmap(iter);
loff_t pos = iter->pos;
loff_t length = iomap_length(iter);
loff_t written = 0;

2
include/linux/iomap.h
View File

@ -211,7 +211,7 @@ static inline u64 iomap_length(const struct iomap_iter *iter)
* for a given operation, which may or may no be identical to the destination
* map in &i->iomap.
*/
static inline struct iomap *iomap_iter_srcmap(struct iomap_iter *i)
static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
{
if (i->srcmap.type != IOMAP_HOLE)
return &i->srcmap;