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| author | Michal Hocko <mhocko@suse.cz> | 2015-06-25 02:58:06 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-25 03:49:44 +0300 |
| commit | 6afdb859b71019143b8eecda02b8b29b03185055 (patch) | |
| tree | 4b7700350fc54a4e531dfd9f9d63c02be75ab4d3 | |
| parent | 0f96ae2928a547b86678688042a9759edcc8285d (diff) | |
| download | linux-6afdb859b71019143b8eecda02b8b29b03185055.tar.xz | |
mm: do not ignore mapping_gfp_mask in page cache allocation paths
page_cache_read, do_generic_file_read, __generic_file_splice_read and
__ntfs_grab_cache_pages currently ignore mapping_gfp_mask when calling
add_to_page_cache_lru which might cause recursion into fs down in the
direct reclaim path if the mapping really relies on GFP_NOFS semantic.
This doesn't seem to be the case now because page_cache_read (page fault
path) doesn't seem to suffer from the reclaim recursion issues and
do_generic_file_read and __generic_file_splice_read also shouldn't be
called under fs locks which would deadlock in the reclaim path. Anyway it
is better to obey mapping gfp mask and prevent from later breakage.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Anton Altaparmakov <anton@tuxera.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/ntfs/file.c | 3 | ||||
| -rw-r--r-- | fs/splice.c | 2 | ||||
| -rw-r--r-- | mm/filemap.c | 7 |
3 files changed, 7 insertions, 5 deletions
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c index 7bb487e663b4..2cd653670764 100644 --- a/fs/ntfs/file.c +++ b/fs/ntfs/file.c @@ -525,7 +525,8 @@ static inline int __ntfs_grab_cache_pages(struct address_space *mapping, } } err = add_to_page_cache_lru(*cached_page, mapping, - index, GFP_KERNEL); + index, + GFP_KERNEL & mapping_gfp_mask(mapping)); if (unlikely(err)) { if (err == -EEXIST) continue; diff --git a/fs/splice.c b/fs/splice.c index bfe62ae40f40..0efef17e9bfa 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -359,7 +359,7 @@ __generic_file_splice_read(struct file *in, loff_t *ppos, break; error = add_to_page_cache_lru(page, mapping, index, - GFP_KERNEL); + GFP_KERNEL & mapping_gfp_mask(mapping)); if (unlikely(error)) { page_cache_release(page); if (error == -EEXIST) diff --git a/mm/filemap.c b/mm/filemap.c index 519af0045b1c..8d17ceea8dbe 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1664,8 +1664,8 @@ no_cached_page: error = -ENOMEM; goto out; } - error = add_to_page_cache_lru(page, mapping, - index, GFP_KERNEL); + error = add_to_page_cache_lru(page, mapping, index, + GFP_KERNEL & mapping_gfp_mask(mapping)); if (error) { page_cache_release(page); if (error == -EEXIST) { @@ -1766,7 +1766,8 @@ static int page_cache_read(struct file *file, pgoff_t offset) if (!page) return -ENOMEM; - ret = add_to_page_cache_lru(page, mapping, offset, GFP_KERNEL); + ret = add_to_page_cache_lru(page, mapping, offset, + GFP_KERNEL & mapping_gfp_mask(mapping)); if (ret == 0) ret = mapping->a_ops->readpage(file, page); else if (ret == -EEXIST) |