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authorMatthew Wilcox <mawilcox@microsoft.com>2018-06-02 19:39:37 -0700
committerDan Williams <dan.j.williams@intel.com>2018-06-02 19:39:37 -0700
commitcc4a90ac816e00775fbc2a9c018bf2af606abd06 (patch)
tree4f3aa285bcb4468655be73035c655e01284e869c /fs/dax.c
parentd6dc57e251a43c428a9ee3adb7665543a1a584f0 (diff)
downloadlinux-cc4a90ac816e00775fbc2a9c018bf2af606abd06.tar.bz2
dax: dax_insert_mapping_entry always succeeds
It does not return an error, so we don't need to check the return value for IS_ERR(). Indeed, it is a bug to do so; with a sufficiently large PFN, a legitimate DAX entry may be mistaken for an error return. Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/fs/dax.c b/fs/dax.c
index e8f61ea690f7..31e9f51ac917 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1009,7 +1009,6 @@ static int dax_load_hole(struct address_space *mapping, void *entry,
unsigned long vaddr = vmf->address;
int ret = VM_FAULT_NOPAGE;
struct page *zero_page;
- void *entry2;
pfn_t pfn;
zero_page = ZERO_PAGE(0);
@@ -1019,13 +1018,8 @@ static int dax_load_hole(struct address_space *mapping, void *entry,
}
pfn = page_to_pfn_t(zero_page);
- entry2 = dax_insert_mapping_entry(mapping, vmf, entry, pfn,
- RADIX_DAX_ZERO_PAGE, false);
- if (IS_ERR(entry2)) {
- ret = VM_FAULT_SIGBUS;
- goto out;
- }
-
+ dax_insert_mapping_entry(mapping, vmf, entry, pfn, RADIX_DAX_ZERO_PAGE,
+ false);
vm_insert_mixed(vmf->vma, vaddr, pfn);
out:
trace_dax_load_hole(inode, vmf, ret);
@@ -1337,10 +1331,6 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
entry = dax_insert_mapping_entry(mapping, vmf, entry, pfn,
0, write && !sync);
- if (IS_ERR(entry)) {
- error = PTR_ERR(entry);
- goto error_finish_iomap;
- }
/*
* If we are doing synchronous page fault and inode needs fsync,
@@ -1424,8 +1414,6 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
pfn = page_to_pfn_t(zero_page);
ret = dax_insert_mapping_entry(mapping, vmf, entry, pfn,
RADIX_DAX_PMD | RADIX_DAX_ZERO_PAGE, false);
- if (IS_ERR(ret))
- goto fallback;
ptl = pmd_lock(vmf->vma->vm_mm, vmf->pmd);
if (!pmd_none(*(vmf->pmd))) {
@@ -1547,8 +1535,6 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
entry = dax_insert_mapping_entry(mapping, vmf, entry, pfn,
RADIX_DAX_PMD, write && !sync);
- if (IS_ERR(entry))
- goto finish_iomap;
/*
* If we are doing synchronous page fault and inode needs fsync,