diff options
author | David S. Miller <davem@davemloft.net> | 2017-06-06 22:20:08 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2017-06-06 22:20:08 -0400 |
commit | 216fe8f021e33c36e3b27c49c9f1951f6b037d7f (patch) | |
tree | a43daec41b4d3955e7a4f8d0ed0654a7c80527ec /fs/dax.c | |
parent | 9747e2313838ee8f5d8073fd6aa7289255c3c51b (diff) | |
parent | b29794ec95c6856b316c2295904208bf11ffddd9 (diff) |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Just some simple overlapping changes in marvell PHY driver
and the DSA core code.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/dax.c')
-rw-r--r-- | fs/dax.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1155,6 +1155,17 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, } /* + * It is possible, particularly with mixed reads & writes to private + * mappings, that we have raced with a PMD fault that overlaps with + * the PTE we need to set up. If so just return and the fault will be + * retried. + */ + if (pmd_trans_huge(*vmf->pmd) || pmd_devmap(*vmf->pmd)) { + vmf_ret = VM_FAULT_NOPAGE; + goto unlock_entry; + } + + /* * Note that we don't bother to use iomap_apply here: DAX required * the file system block size to be equal the page size, which means * that we never have to deal with more than a single extent here. @@ -1398,6 +1409,18 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf, goto fallback; /* + * It is possible, particularly with mixed reads & writes to private + * mappings, that we have raced with a PTE fault that overlaps with + * the PMD we need to set up. If so just return and the fault will be + * retried. + */ + if (!pmd_none(*vmf->pmd) && !pmd_trans_huge(*vmf->pmd) && + !pmd_devmap(*vmf->pmd)) { + result = 0; + goto unlock_entry; + } + + /* * Note that we don't use iomap_apply here. We aren't doing I/O, only * setting up a mapping, so really we're using iomap_begin() as a way * to look up our filesystem block. |