From: Gao Xiang Date: Tue, 13 Oct 2020 23:52:04 +0000 (-0700) Subject: swap: rename SWP_FS to SWAP_FS_OPS to avoid ambiguity X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3264631548b1f2bf89b71793d06bfd0f748f649d;p=linux.git swap: rename SWP_FS to SWAP_FS_OPS to avoid ambiguity SWP_FS is used to make swap_{read,write}page() go through the filesystem, and it's only used for swap files over NFS for now. Otherwise it will directly submit IO to blockdev according to swapfile extents reported by filesystems in advance. As Matthew pointed out [1], SWP_FS naming is somewhat confusing, so let's rename to SWP_FS_OPS. [1] https://lore.kernel.org/r/20200820113448.GM17456@casper.infradead.org Suggested-by: Matthew Wilcox Signed-off-by: Gao Xiang Signed-off-by: Andrew Morton Link: https://lkml.kernel.org/r/20200822113019.11319-1-hsiangkao@redhat.com Signed-off-by: Linus Torvalds --- diff --git a/include/linux/swap.h b/include/linux/swap.h index 23c6e43a956de..7bd5b4aac049e 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -170,7 +170,7 @@ enum { SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */ SWP_BLKDEV = (1 << 6), /* its a block device */ SWP_ACTIVATED = (1 << 7), /* set after swap_activate success */ - SWP_FS = (1 << 8), /* swap file goes through fs */ + SWP_FS_OPS = (1 << 8), /* swapfile operations go through fs */ SWP_AREA_DISCARD = (1 << 9), /* single-time swap area discards */ SWP_PAGE_DISCARD = (1 << 10), /* freed swap page-cluster discards */ SWP_STABLE_WRITES = (1 << 11), /* no overwrite PG_writeback pages */ diff --git a/mm/page_io.c b/mm/page_io.c index f9e9267f296f5..2ffe4c4a6d975 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -312,7 +312,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc, struct swap_info_struct *sis = page_swap_info(page); VM_BUG_ON_PAGE(!PageSwapCache(page), page); - if (data_race(sis->flags & SWP_FS)) { + if (data_race(sis->flags & SWP_FS_OPS)) { struct kiocb kiocb; struct file *swap_file = sis->swap_file; struct address_space *mapping = swap_file->f_mapping; @@ -403,7 +403,7 @@ int swap_readpage(struct page *page, bool synchronous) goto out; } - if (data_race(sis->flags & SWP_FS)) { + if (data_race(sis->flags & SWP_FS_OPS)) { struct file *swap_file = sis->swap_file; struct address_space *mapping = swap_file->f_mapping; @@ -467,7 +467,7 @@ int swap_set_page_dirty(struct page *page) { struct swap_info_struct *sis = page_swap_info(page); - if (data_race(sis->flags & SWP_FS)) { + if (data_race(sis->flags & SWP_FS_OPS)) { struct address_space *mapping = sis->swap_file->f_mapping; VM_BUG_ON_PAGE(!PageSwapCache(page), page); diff --git a/mm/swap_state.c b/mm/swap_state.c index f24f2cea4238e..aa40e706604cd 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -665,7 +665,7 @@ struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t gfp_mask, goto skip; /* Test swap type to make sure the dereference is safe */ - if (likely(si->flags & (SWP_BLKDEV | SWP_FS))) { + if (likely(si->flags & (SWP_BLKDEV | SWP_FS_OPS))) { struct inode *inode = si->swap_file->f_mapping->host; if (inode_read_congested(inode)) goto skip; diff --git a/mm/swapfile.c b/mm/swapfile.c index ced4635d924cf..183b87bc87ccb 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2437,7 +2437,7 @@ static int setup_swap_extents(struct swap_info_struct *sis, sector_t *span) if (ret >= 0) sis->flags |= SWP_ACTIVATED; if (!ret) { - sis->flags |= SWP_FS; + sis->flags |= SWP_FS_OPS; ret = add_swap_extent(sis, 0, sis->max, 0); *span = sis->pages; }