60 lines
2.0 KiB
Diff
60 lines
2.0 KiB
Diff
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Subject: [PATCH 28/31] nfs: fix various memory recursions possible with swap over NFS.
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Patch-mainline: not yet
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GFP_NOFS is _more_ permissive than GFP_NOIO in that it will initiate IO,
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just not of any filesystem data.
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The problem is that previuosly NOFS was correct because that avoids
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recursion into the NFS code, it now is not, because also IO (swap) can
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lead to this recursion.
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Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
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Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
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---
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fs/nfs/pagelist.c | 2 +-
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fs/nfs/write.c | 7 ++++---
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2 files changed, 5 insertions(+), 4 deletions(-)
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--- a/fs/nfs/pagelist.c
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+++ b/fs/nfs/pagelist.c
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@@ -27,7 +27,7 @@ static inline struct nfs_page *
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nfs_page_alloc(void)
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{
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struct nfs_page *p;
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- p = kmem_cache_alloc(nfs_page_cachep, GFP_KERNEL);
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+ p = kmem_cache_alloc(nfs_page_cachep, GFP_NOIO);
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if (p) {
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memset(p, 0, sizeof(*p));
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INIT_LIST_HEAD(&p->wb_list);
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--- a/fs/nfs/write.c
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+++ b/fs/nfs/write.c
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@@ -50,7 +50,7 @@ static mempool_t *nfs_commit_mempool;
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struct nfs_write_data *nfs_commitdata_alloc(void)
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{
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- struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
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+ struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
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if (p) {
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memset(p, 0, sizeof(*p));
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@@ -69,7 +69,7 @@ void nfs_commit_free(struct nfs_write_da
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struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
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{
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- struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
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+ struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
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if (p) {
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memset(p, 0, sizeof(*p));
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@@ -79,7 +79,8 @@ struct nfs_write_data *nfs_writedata_all
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if (pagecount <= ARRAY_SIZE(p->page_array))
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p->pagevec = p->page_array;
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else {
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- p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
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+ p->pagevec = kcalloc(pagecount, sizeof(struct page *),
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+ GFP_NOIO);
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if (!p->pagevec) {
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mempool_free(p, nfs_wdata_mempool);
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p = NULL;
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