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libceph: check for invalid mapping

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If we encounter an invalid (e.g., zeroed) mapping, return an error
and avoid a divide by zero.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
This commit is contained in:
Sage Weil 2012-09-24 20:59:48 -07:00 committed by Alex Elder
parent b905a7f8b7
commit d63b77f4c5
4 changed files with 40 additions and 18 deletions
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2
include/linux/ceph/osd_client.h
View file

@ -207,7 +207,7 @@ extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
struct ceph_msg *msg);
extern void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
extern int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
u64 snapid,
u64 off, u64 *plen, u64 *bno,

6
include/linux/ceph/osdmap.h
View file

@ -109,9 +109,9 @@ extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
/* calculate mapping of a file extent to an object */
extern void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
u64 off, u64 *plen,
u64 *bno, u64 *oxoff, u64 *oxlen);
extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
u64 off, u64 *plen,
u64 *bno, u64 *oxoff, u64 *oxlen);
/* calculate mapping of object to a placement group */
extern int ceph_calc_object_layout(struct ceph_object_layout *ol,

32
net/ceph/osd_client.c
View file

@ -52,7 +52,7 @@ static int op_has_extent(int op)
op == CEPH_OSD_OP_WRITE);
}
void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
u64 snapid,
u64 off, u64 *plen, u64 *bno,
@ -62,12 +62,15 @@ void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
u64 orig_len = *plen;
u64 objoff, objlen; /* extent in object */
int r;
reqhead->snapid = cpu_to_le64(snapid);
/* object extent? */
ceph_calc_file_object_mapping(layout, off, plen, bno,
&objoff, &objlen);
r = ceph_calc_file_object_mapping(layout, off, plen, bno,
&objoff, &objlen);
if (r < 0)
return r;
if (*plen < orig_len)
dout(" skipping last %llu, final file extent %llu~%llu\n",
orig_len - *plen, off, *plen);
@ -83,7 +86,7 @@ void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
*bno, objoff, objlen, req->r_num_pages);
return 0;
}
EXPORT_SYMBOL(ceph_calc_raw_layout);
@ -112,20 +115,25 @@ EXPORT_SYMBOL(ceph_calc_raw_layout);
*
* fill osd op in request message.
*/
static void calc_layout(struct ceph_osd_client *osdc,
struct ceph_vino vino,
struct ceph_file_layout *layout,
u64 off, u64 *plen,
struct ceph_osd_request *req,
struct ceph_osd_req_op *op)
static int calc_layout(struct ceph_osd_client *osdc,
struct ceph_vino vino,
struct ceph_file_layout *layout,
u64 off, u64 *plen,
struct ceph_osd_request *req,
struct ceph_osd_req_op *op)
{
u64 bno;
int r;
ceph_calc_raw_layout(osdc, layout, vino.snap, off,
plen, &bno, req, op);
r = ceph_calc_raw_layout(osdc, layout, vino.snap, off,
plen, &bno, req, op);
if (r < 0)
return r;
snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
req->r_oid_len = strlen(req->r_oid);
return r;
}
/*

18
net/ceph/osdmap.c
View file

@ -984,7 +984,7 @@ bad:
* for now, we write only a single su, until we can
* pass a stride back to the caller.
*/
void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
u64 off, u64 *plen,
u64 *ono,
u64 *oxoff, u64 *oxlen)
@ -998,11 +998,17 @@ void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
dout("mapping %llu~%llu osize %u fl_su %u\n", off, *plen,
osize, su);
if (su == 0 || sc == 0)
goto invalid;
su_per_object = osize / su;
if (su_per_object == 0)
goto invalid;
dout("osize %u / su %u = su_per_object %u\n", osize, su,
su_per_object);
BUG_ON((su & ~PAGE_MASK) != 0);
if ((su & ~PAGE_MASK) != 0)
goto invalid;
/* bl = *off / su; */
t = off;
do_div(t, su);
@ -1030,6 +1036,14 @@ void ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
*plen = *oxlen;
dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
return 0;
invalid:
dout(" invalid layout\n");
*ono = 0;
*oxoff = 0;
*oxlen = 0;
return -EINVAL;
}
EXPORT_SYMBOL(ceph_calc_file_object_mapping);