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From: Matthew Wilcox <matthew.r.wilcox@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>,
	linux-mm@kvack.org, linux-nvdimm@lists.01.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	willy@linux.intel.com
Subject: [PATCH 1/6] dax: Use vmf->gfp_mask
Date: Sun, 31 Jan 2016 23:19:50 +1100	[thread overview]
Message-ID: <1454242795-18038-2-git-send-email-matthew.r.wilcox@intel.com> (raw)
In-Reply-To: <1454242795-18038-1-git-send-email-matthew.r.wilcox@intel.com>

We were assuming that it was OK to do a GFP_KERNEL allocation in page
fault context.  That appears to be largely true, but filesystems are
permitted to override that in their setting of mapping->gfp_flags, which
the VM then massages into vmf->gfp_flags.  No practical difference for
now, but there may come a day when we would have surprised a filesystem.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
---
 fs/dax.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 2f9bb89..11be8c7 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -292,7 +292,7 @@ static int dax_load_hole(struct address_space *mapping, struct page *page,
 	struct inode *inode = mapping->host;
 	if (!page)
 		page = find_or_create_page(mapping, vmf->pgoff,
-						GFP_KERNEL | __GFP_ZERO);
+						vmf->gfp_mask | __GFP_ZERO);
 	if (!page)
 		return VM_FAULT_OOM;
 	/* Recheck i_size under page lock to avoid truncate race */
-- 
2.7.0.rc3

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WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <matthew.r.wilcox@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>,
	linux-mm@kvack.org, linux-nvdimm@ml01.01.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	willy@linux.intel.com
Subject: [PATCH 1/6] dax: Use vmf->gfp_mask
Date: Sun, 31 Jan 2016 23:19:50 +1100	[thread overview]
Message-ID: <1454242795-18038-2-git-send-email-matthew.r.wilcox@intel.com> (raw)
In-Reply-To: <1454242795-18038-1-git-send-email-matthew.r.wilcox@intel.com>

We were assuming that it was OK to do a GFP_KERNEL allocation in page
fault context.  That appears to be largely true, but filesystems are
permitted to override that in their setting of mapping->gfp_flags, which
the VM then massages into vmf->gfp_flags.  No practical difference for
now, but there may come a day when we would have surprised a filesystem.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
---
 fs/dax.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dax.c b/fs/dax.c
index 2f9bb89..11be8c7 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -292,7 +292,7 @@ static int dax_load_hole(struct address_space *mapping, struct page *page,
 	struct inode *inode = mapping->host;
 	if (!page)
 		page = find_or_create_page(mapping, vmf->pgoff,
-						GFP_KERNEL | __GFP_ZERO);
+						vmf->gfp_mask | __GFP_ZERO);
 	if (!page)
 		return VM_FAULT_OOM;
 	/* Recheck i_size under page lock to avoid truncate race */
-- 
2.7.0.rc3

  reply	other threads:[~2016-01-31 12:19 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-31 12:19 [PATCH 0/6] DAX cleanups Matthew Wilcox
2016-01-31 12:19 ` Matthew Wilcox
2016-01-31 12:19 ` Matthew Wilcox [this message]
2016-01-31 12:19   ` [PATCH 1/6] dax: Use vmf->gfp_mask Matthew Wilcox
2016-02-23 23:37   ` Ross Zwisler
2016-02-23 23:37     ` Ross Zwisler
2016-01-31 12:19 ` [PATCH 2/6] dax: Remove unnecessary rechecking of i_size Matthew Wilcox
2016-01-31 12:19   ` Matthew Wilcox
2016-01-31 12:19 ` [PATCH 3/6] dax: Use vmf->pgoff in fault handlers Matthew Wilcox
2016-01-31 12:19   ` Matthew Wilcox
2016-01-31 12:19 ` [PATCH 4/6] dax: Use PAGE_CACHE_SIZE where appropriate Matthew Wilcox
2016-01-31 12:19   ` Matthew Wilcox
2016-02-01 13:10   ` Kirill A. Shutemov
2016-02-01 13:10     ` Kirill A. Shutemov
2016-02-01 20:43     ` Matthew Wilcox
2016-02-01 20:43       ` Matthew Wilcox
2016-01-31 12:19 ` [PATCH 5/6] dax: Factor dax_insert_pmd_mapping out of dax_pmd_fault Matthew Wilcox
2016-01-31 12:19   ` Matthew Wilcox
2016-01-31 12:19 ` [PATCH 6/6] dax: Factor dax_insert_pud_mapping out of dax_pud_fault Matthew Wilcox
2016-01-31 12:19   ` Matthew Wilcox

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