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authorMichal Hocko <mhocko@suse.cz>2014-12-29 20:30:35 +0100
committerJiri Slaby <jslaby@suse.cz>2015-01-29 15:45:13 +0100
commitc367abe482eaef94fb094726c6b06b9435c68198 (patch)
tree3faf0a40c37aaf7c23891d0f8521adb978a17228 /include
parent9d4db12409f0e4a3865c6179d7ac30a51a986018 (diff)
mm: get rid of radix tree gfp mask for pagecache_get_page
commit 45f87de57f8fad59302fd263dd81ffa4843b5b24 upstream. Commit 2457aec63745 ("mm: non-atomically mark page accessed during page cache allocation where possible") has added a separate parameter for specifying gfp mask for radix tree allocations. Not only this is less than optimal from the API point of view because it is error prone, it is also buggy currently because grab_cache_page_write_begin is using GFP_KERNEL for radix tree and if fgp_flags doesn't contain FGP_NOFS (mostly controlled by fs by AOP_FLAG_NOFS flag) but the mapping_gfp_mask has __GFP_FS cleared then the radix tree allocation wouldn't obey the restriction and might recurse into filesystem and cause deadlocks. This is the case for most filesystems unfortunately because only ext4 and gfs2 are using AOP_FLAG_NOFS. Let's simply remove radix_gfp_mask parameter because the allocation context is same for both page cache and for the radix tree. Just make sure that the radix tree gets only the sane subset of the mask (e.g. do not pass __GFP_WRITE). Long term it is more preferable to convert remaining users of AOP_FLAG_NOFS to use mapping_gfp_mask instead and simplify this interface even further. Reported-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'include')
-rw-r--r--include/linux/pagemap.h13
1 files changed, 6 insertions, 7 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index d57a02a9747b..bf944e86895b 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -256,7 +256,7 @@ pgoff_t page_cache_prev_hole(struct address_space *mapping,
#define FGP_NOWAIT 0x00000020
struct page *pagecache_get_page(struct address_space *mapping, pgoff_t offset,
- int fgp_flags, gfp_t cache_gfp_mask, gfp_t radix_gfp_mask);
+ int fgp_flags, gfp_t cache_gfp_mask);
/**
* find_get_page - find and get a page reference
@@ -271,13 +271,13 @@ struct page *pagecache_get_page(struct address_space *mapping, pgoff_t offset,
static inline struct page *find_get_page(struct address_space *mapping,
pgoff_t offset)
{
- return pagecache_get_page(mapping, offset, 0, 0, 0);
+ return pagecache_get_page(mapping, offset, 0, 0);
}
static inline struct page *find_get_page_flags(struct address_space *mapping,
pgoff_t offset, int fgp_flags)
{
- return pagecache_get_page(mapping, offset, fgp_flags, 0, 0);
+ return pagecache_get_page(mapping, offset, fgp_flags, 0);
}
/**
@@ -297,7 +297,7 @@ static inline struct page *find_get_page_flags(struct address_space *mapping,
static inline struct page *find_lock_page(struct address_space *mapping,
pgoff_t offset)
{
- return pagecache_get_page(mapping, offset, FGP_LOCK, 0, 0);
+ return pagecache_get_page(mapping, offset, FGP_LOCK, 0);
}
/**
@@ -324,7 +324,7 @@ static inline struct page *find_or_create_page(struct address_space *mapping,
{
return pagecache_get_page(mapping, offset,
FGP_LOCK|FGP_ACCESSED|FGP_CREAT,
- gfp_mask, gfp_mask & GFP_RECLAIM_MASK);
+ gfp_mask);
}
/**
@@ -345,8 +345,7 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping,
{
return pagecache_get_page(mapping, index,
FGP_LOCK|FGP_CREAT|FGP_NOFS|FGP_NOWAIT,
- mapping_gfp_mask(mapping),
- GFP_NOFS);
+ mapping_gfp_mask(mapping));
}
struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);