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libceph: remove MAX_EXTENTS check for sparse reads 

There is no any limit for the extent array size and it's possible
that when reading with a large size contents the total number of
extents will exceed 4096. Then the messager will fail by reseting
the connection and keeps resending the inflight IOs infinitely.

[ idryomov: adjust error message ]

Link: https://tracker.ceph.com/issues/62081
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2023-11-07 09:37:47 +08:00 committed by Ilya Dryomov
parent f48e0342a7
commit b79e4a0aa9
1 changed files with 4 additions and 13 deletions
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17
net/ceph/osd_client.c
View File

@ -5850,8 +5850,6 @@ static inline void convert_extent_map(struct ceph_sparse_read *sr)
}
#endif
#define MAX_EXTENTS 4096
static int osd_sparse_read(struct ceph_connection *con,
struct ceph_msg_data_cursor *cursor,
char **pbuf)
@ -5882,23 +5880,16 @@ next_op:
if (count > 0) {
if (!sr->sr_extent || count > sr->sr_ext_len) {
/*
* Apply a hard cap to the number of extents.
* If we have more, assume something is wrong.
*/
if (count > MAX_EXTENTS) {
dout("%s: OSD returned 0x%x extents in a single reply!\n",
__func__, count);
return -EREMOTEIO;
}
/* no extent array provided, or too short */
kfree(sr->sr_extent);
sr->sr_extent = kmalloc_array(count,
sizeof(*sr->sr_extent),
GFP_NOIO);
if (!sr->sr_extent)
if (!sr->sr_extent) {
pr_err("%s: failed to allocate %u extents\n",
__func__, count);
return -ENOMEM;
}
sr->sr_ext_len = count;
}
ret = count * sizeof(*sr->sr_extent);