git/linux-net
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/ synced 2026-04-08 17:57:43 -04:00
Code Issues Packages Projects Releases Wiki Activity

iomap: stash iomap read ctx in the private field of iomap_iter

Browse Source 
It's useful to get filesystem-specific information using the
existing private field in the @iomap_iter passed to iomap_{begin,end}
for advanced usage for iomap buffered reads, which is much like the
current iomap DIO.

For example, EROFS needs it to:

 - implement an efficient page cache sharing feature, since iomap
   needs to apply to anon inode page cache but we'd like to get the
   backing inode/fs instead, so filesystem-specific private data is
   needed to keep such information;

 - pass in both struct page * and void * for inline data to avoid
   kmap_to_page() usage (which is bogus).

Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Link: https://patch.msgid.link/20260109102856.598531-2-lihongbo22@huawei.com
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Hongbo Li
2026-01-09 10:28:47 +00:00
committed by Christian Brauner
parent 8f0b4cce44
commit 8806f27924
3 changed files with 10 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/fuse/file.c
View File

@@ -979,7 +979,7 @@ static int fuse_read_folio(struct file *file, struct folio *folio)
return -EIO;
}
iomap_read_folio(&fuse_iomap_ops, &ctx);
iomap_read_folio(&fuse_iomap_ops, &ctx, NULL);
fuse_invalidate_atime(inode);
return 0;
}
@@ -1081,7 +1081,7 @@ static void fuse_readahead(struct readahead_control *rac)
if (fuse_is_bad(inode))
return;
iomap_readahead(&fuse_iomap_ops, &ctx);
iomap_readahead(&fuse_iomap_ops, &ctx, NULL);
}
static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to)

6
fs/iomap/buffered-io.c
View File

@@ -555,13 +555,14 @@ static int iomap_read_folio_iter(struct iomap_iter *iter,
}
void iomap_read_folio(const struct iomap_ops *ops,
struct iomap_read_folio_ctx *ctx)
struct iomap_read_folio_ctx *ctx, void *private)
{
struct folio *folio = ctx->cur_folio;
struct iomap_iter iter = {
.inode = folio->mapping->host,
.pos = folio_pos(folio),
.len = folio_size(folio),
.private = private,
};
size_t bytes_submitted = 0;
int ret;
@@ -620,13 +621,14 @@ static int iomap_readahead_iter(struct iomap_iter *iter,
* the filesystem to be reentered.
*/
void iomap_readahead(const struct iomap_ops *ops,
struct iomap_read_folio_ctx *ctx)
struct iomap_read_folio_ctx *ctx, void *private)
{
struct readahead_control *rac = ctx->rac;
struct iomap_iter iter = {
.inode = rac->mapping->host,
.pos = readahead_pos(rac),
.len = readahead_length(rac),
.private = private,
};
size_t cur_bytes_submitted;

8
include/linux/iomap.h
View File

@@ -341,9 +341,9 @@ ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops,
const struct iomap_write_ops *write_ops, void *private);
void iomap_read_folio(const struct iomap_ops *ops,
struct iomap_read_folio_ctx *ctx);
struct iomap_read_folio_ctx *ctx, void *private);
void iomap_readahead(const struct iomap_ops *ops,
struct iomap_read_folio_ctx *ctx);
struct iomap_read_folio_ctx *ctx, void *private);
bool iomap_is_partially_uptodate(struct folio *, size_t from, size_t count);
struct folio *iomap_get_folio(struct iomap_iter *iter, loff_t pos, size_t len);
bool iomap_release_folio(struct folio *folio, gfp_t gfp_flags);
@@ -595,7 +595,7 @@ static inline void iomap_bio_read_folio(struct folio *folio,
.cur_folio = folio,
};
iomap_read_folio(ops, &ctx);
iomap_read_folio(ops, &ctx, NULL);
}
static inline void iomap_bio_readahead(struct readahead_control *rac,
@@ -606,7 +606,7 @@ static inline void iomap_bio_readahead(struct readahead_control *rac,
.rac = rac,
};
iomap_readahead(ops, &ctx);
iomap_readahead(ops, &ctx, NULL);
}
#endif /* CONFIG_BLOCK */