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fs: Add FGP_WRITEBEGIN

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This particular combination of flags is used by most filesystems
in their ->write_begin method, although it does find use in a
few other places.  Before folios, it warranted its own function
(grab_cache_page_write_begin()), but I think that just having specialised
flags is enough.  It certainly helps the few places that have been
converted from grab_cache_page_write_begin() to __filemap_get_folio().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20230324180129.1220691-2-willy@infradead.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Matthew Wilcox
2023-03-24 18:01:01 +00:00
committed by Theodore Ts'o
parent 361eb69fc9
commit e999a5c5a1
6 changed files with 9 additions and 19 deletions
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2
include/linux/pagemap.h
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@@ -507,6 +507,8 @@ pgoff_t page_cache_prev_miss(struct address_space *mapping,
#define FGP_ENTRY 0x00000080
#define FGP_STABLE 0x00000100
#define FGP_WRITEBEGIN (FGP_LOCK | FGP_WRITE | FGP_CREAT | FGP_STABLE)
struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
int fgp_flags, gfp_t gfp);
struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index,