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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-09-04 09:22:54 -0700 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2017-09-04 09:22:54 -0700 |
commit | a6cbfa1e6d38c4b3ab0ce7e3aea4bb4e744f24b8 (patch) | |
tree | 8960e571a398b5d32e72bdb9c89ce965daa870ab /fs/dax.c | |
parent | f5308d1b83eba20e69df5e0926ba7257c8dd9074 (diff) | |
parent | 08d6ac9ee5fedd82040bc878705981b67a116a3f (diff) |
Merge branch 'next' into for-linus
Prepare input updates for 4.14 merge window.
Diffstat (limited to 'fs/dax.c')
-rw-r--r-- | fs/dax.c | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -859,6 +859,7 @@ int dax_writeback_mapping_range(struct address_space *mapping, if (ret < 0) goto out; } + start_index = indices[pvec.nr - 1] + 1; } out: put_dax(dax_dev); @@ -1155,6 +1156,17 @@ 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 +1410,18 @@ 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. |