kernel/git/next/linux-next.git/fs/buffer.c, branch akpm-base

Merge branch 'mm-everything' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-06-28T06:54:05+00:00

# Conflicts: # include/linux/pagevec.h

mm: memcontrol: make all the callers of {folio,page}_memcg() safe

2022-06-27T20:45:36+00:00

When we use objcg APIs to charge the LRU pages, the page will not hold a reference to the memcg associated with the page. So the caller of the {folio,page}_memcg() should hold an rcu read lock or obtain a reference to the memcg associated with the page to protect memcg from being released. So introduce get_mem_cgroup_from_{page,folio}() to obtain a reference to the memory cgroup associated with the page. In this patch, make all the callers hold an rcu read lock or obtain a reference to the memcg to protect memcg from being released when the LRU pages reparented. We do not need to adjust the callers of {folio,page}_memcg() during the whole process of mem_cgroup_move_task(). Because the cgroup migration and memory cgroup offlining are serialized by @cgroup_mutex. In this routine, the LRU pages cannot be reparented to its parent memory cgroup. So {folio,page}_memcg() is stable and cannot be released. This is a preparation for reparenting the LRU pages. Link: https://lkml.kernel.org/r/20220621125658.64935-8-songmuchun@bytedance.com Signed-off-by: Muchun Song Acked-by: Roman Gushchin Cc: Johannes Weiner Cc: Michal Hocko Cc: Michal Koutný Cc: Shakeel Butt Cc: Waiman Long Cc: Xiongchun Duan Signed-off-by: Andrew Morton

fs: remove the nobh helpers

2022-06-26T13:47:17+00:00

All callers are gone, so remove the now dead code. Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Signed-off-by: Matthew Wilcox (Oracle)

buffer: Don't test folio error in block_read_full_folio()

2022-06-26T13:47:15+00:00

We can cache this information in a local variable instead of communicating from one part of the function to another via folio flags. Signed-off-by: Matthew Wilcox (Oracle)

buffer: Remove check for PageError

2022-06-26T13:47:15+00:00

If a buffer is completed with an error, its uptodate flag will be clear, so the page_uptodate variable will have been set to 0. There's no need to check PageError here. Signed-off-by: Matthew Wilcox (Oracle)

buffer: Convert clean_bdev_aliases() to use filemap_get_folios()

2022-06-26T13:47:14+00:00

Use a folio throughout this function. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Christian Brauner (Microsoft)

fs: Convert drop_buffers() to use a folio

2022-05-10T03:12:34+00:00

All callers now have a folio. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Jeff Layton

fs: Change try_to_free_buffers() to take a folio

2022-05-10T03:12:34+00:00

All but two of the callers already have a folio; pass a folio into try_to_free_buffers(). This removes the last user of cancel_dirty_page() so remove that wrapper function too. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Jeff Layton

mm,fs: Remove aops->readpage

2022-05-09T20:28:36+00:00

With all implementations of aops->readpage converted to aops->read_folio, we can stop checking whether it's set and remove the member from aops. Signed-off-by: Matthew Wilcox (Oracle)

fs: Convert block_read_full_page() to block_read_full_folio()

2022-05-09T20:21:44+00:00

This function is NOT converted to handle large folios, so include an assert that the filesystem isn't passing one in. Otherwise, use the folio functions instead of the page functions, where they exist. Convert all filesystems which use block_read_full_page(). Signed-off-by: Matthew Wilcox (Oracle)