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ceph: block non-fatal signals for fault/page_mkwrite 

Fault and page_mkwrite are supposed to be uninterruptable. But they
call ceph functions that are interruptible. So they should block
signals before calling functions that are interruptible

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-05-10 18:40:28 +08:00 committed by Ilya Dryomov
parent 3b33f692c8
commit 4f7e89f6ac
1 changed files with 39 additions and 27 deletions
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66
fs/ceph/addr.c
View File

@ -1315,6 +1315,17 @@ const struct address_space_operations ceph_aops = {
.direct_IO = ceph_direct_io,
};
static void ceph_block_sigs(sigset_t *oldset)
{
sigset_t mask;
siginitsetinv(&mask, sigmask(SIGKILL));
sigprocmask(SIG_BLOCK, &mask, oldset);
}
static void ceph_restore_sigs(sigset_t *oldset)
{
sigprocmask(SIG_SETMASK, oldset, NULL);
}
/*
* vm ops
@ -1327,6 +1338,9 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
struct page *pinned_page = NULL;
loff_t off = vmf->pgoff << PAGE_SHIFT;
int want, got, ret;
sigset_t oldset;
ceph_block_sigs(&oldset);
dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
@ -1334,16 +1348,12 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_CACHE;
while (1) {
got = 0;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want,
-1, &got, &pinned_page);
if (ret == 0)
break;
if (ret != -ERESTARTSYS) {
WARN_ON(1);
return VM_FAULT_SIGBUS;
}
got = 0;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
if (ret < 0) {
ret = VM_FAULT_SIGBUS;
goto out_restore;
}
dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
@ -1361,7 +1371,7 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
ceph_put_cap_refs(ci, got);
if (ret != -EAGAIN)
return ret;
goto out_restore;
/* read inline data */
if (off >= PAGE_SIZE) {
@ -1375,7 +1385,7 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
~__GFP_FS));
if (!page) {
ret = VM_FAULT_OOM;
goto out;
goto out_inline;
}
ret1 = __ceph_do_getattr(inode, page,
CEPH_STAT_CAP_INLINE_DATA, true);
@ -1383,7 +1393,7 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
unlock_page(page);
put_page(page);
ret = VM_FAULT_SIGBUS;
goto out;
goto out_inline;
}
if (ret1 < PAGE_SIZE)
zero_user_segment(page, ret1, PAGE_SIZE);
@ -1392,10 +1402,12 @@ static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
SetPageUptodate(page);
vmf->page = page;
ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
out_inline:
dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
inode, off, (size_t)PAGE_SIZE, ret);
}
out:
dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
inode, off, (size_t)PAGE_SIZE, ret);
out_restore:
ceph_restore_sigs(&oldset);
return ret;
}
@ -1413,11 +1425,14 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
loff_t size = i_size_read(inode);
size_t len;
int want, got, ret;
sigset_t oldset;
prealloc_cf = ceph_alloc_cap_flush();
if (!prealloc_cf)
return VM_FAULT_SIGBUS;
ceph_block_sigs(&oldset);
if (ci->i_inline_version != CEPH_INLINE_NONE) {
struct page *locked_page = NULL;
if (off == 0) {
@ -1444,17 +1459,13 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
while (1) {
got = 0;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
&got, NULL);
if (ret == 0)
break;
if (ret != -ERESTARTSYS) {
WARN_ON(1);
ret = VM_FAULT_SIGBUS;
goto out_free;
}
got = 0;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
&got, NULL);
if (ret < 0) {
ret = VM_FAULT_SIGBUS;
goto out_free;
}
dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
inode, off, len, ceph_cap_string(got));
@ -1499,6 +1510,7 @@ out:
inode, off, len, ceph_cap_string(got), ret);
ceph_put_cap_refs(ci, got);
out_free:
ceph_restore_sigs(&oldset);
ceph_free_cap_flush(prealloc_cf);
return ret;