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fuse: support large folios for retrieves

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Add support for folios larger than one page size for retrieves.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Bernd Schubert <bschubert@ddn.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Joanne Koong
2025-05-12 15:58:31 -07:00
committed by Miklos Szeredi
parent 394244b24f
commit 3568a95693
1 changed files with 15 additions and 10 deletions
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25
fs/fuse/dev.c
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@@ -1849,7 +1849,7 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
unsigned int num;
unsigned int offset;
size_t total_len = 0;
unsigned int num_pages, cur_pages = 0;
unsigned int num_pages;
struct fuse_conn *fc = fm->fc;
struct fuse_retrieve_args *ra;
size_t args_size = sizeof(*ra);
@@ -1867,6 +1867,7 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
num_pages = min(num_pages, fc->max_pages);
num = min(num, num_pages << PAGE_SHIFT);
args_size += num_pages * (sizeof(ap->folios[0]) + sizeof(ap->descs[0]));
@@ -1887,25 +1888,29 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
index = outarg->offset >> PAGE_SHIFT;
while (num && cur_pages < num_pages) {
while (num) {
struct folio *folio;
unsigned int this_num;
unsigned int folio_offset;
unsigned int nr_bytes;
unsigned int nr_pages;
folio = filemap_get_folio(mapping, index);
if (IS_ERR(folio))
break;
this_num = min_t(unsigned, num, PAGE_SIZE - offset);
folio_offset = ((index - folio->index) << PAGE_SHIFT) + offset;
nr_bytes = min(folio_size(folio) - folio_offset, num);
nr_pages = (offset + nr_bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
ap->folios[ap->num_folios] = folio;
ap->descs[ap->num_folios].offset = offset;
ap->descs[ap->num_folios].length = this_num;
ap->descs[ap->num_folios].offset = folio_offset;
ap->descs[ap->num_folios].length = nr_bytes;
ap->num_folios++;
cur_pages++;
offset = 0;
num -= this_num;
total_len += this_num;
index++;
num -= nr_bytes;
total_len += nr_bytes;
index += nr_pages;
}
ra->inarg.offset = outarg->offset;
ra->inarg.size = total_len;