6.6-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Gruenbacher agruenba@redhat.com
[ Upstream commit be7f6a6b0bca708999eef4f8e9f2b128c73b9e17 ]
Change gfs2_internal_read() to use folios. Convert sizes to size_t.
Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Stable-dep-of: d98779e68772 ("gfs2: Fix potential glock use-after-free on unmount") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/gfs2/aops.c | 34 ++++++++++++++++------------------ fs/gfs2/inode.h | 4 ++-- 2 files changed, 18 insertions(+), 20 deletions(-)
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index c26d48355cc27..48dc35caa60b4 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -479,31 +479,29 @@ static int gfs2_read_folio(struct file *file, struct folio *folio) * */
-int gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, - unsigned size) +ssize_t gfs2_internal_read(struct gfs2_inode *ip, char *buf, loff_t *pos, + size_t size) { struct address_space *mapping = ip->i_inode.i_mapping; unsigned long index = *pos >> PAGE_SHIFT; - unsigned offset = *pos & (PAGE_SIZE - 1); - unsigned copied = 0; - unsigned amt; - struct page *page; + size_t copied = 0;
do { - page = read_cache_page(mapping, index, gfs2_read_folio, NULL); - if (IS_ERR(page)) { - if (PTR_ERR(page) == -EINTR) + size_t offset, chunk; + struct folio *folio; + + folio = read_cache_folio(mapping, index, gfs2_read_folio, NULL); + if (IS_ERR(folio)) { + if (PTR_ERR(folio) == -EINTR) continue; - return PTR_ERR(page); + return PTR_ERR(folio); } - amt = size - copied; - if (offset + size > PAGE_SIZE) - amt = PAGE_SIZE - offset; - memcpy_from_page(buf + copied, page, offset, amt); - put_page(page); - copied += amt; - index++; - offset = 0; + offset = *pos + copied - folio_pos(folio); + chunk = min(size - copied, folio_size(folio) - offset); + memcpy_from_folio(buf + copied, folio, offset, chunk); + index = folio_next_index(folio); + folio_put(folio); + copied += chunk; } while(copied < size); (*pos) += size; return size; diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h index c8c5814e7295d..75e662949f04d 100644 --- a/fs/gfs2/inode.h +++ b/fs/gfs2/inode.h @@ -13,8 +13,8 @@ #include "util.h"
bool gfs2_release_folio(struct folio *folio, gfp_t gfp_mask); -extern int gfs2_internal_read(struct gfs2_inode *ip, - char *buf, loff_t *pos, unsigned size); +extern ssize_t gfs2_internal_read(struct gfs2_inode *ip, + char *buf, loff_t *pos, size_t size); extern void gfs2_set_aops(struct inode *inode);
static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)