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ceph: define 'end/complete' in readdir reply as bit flags

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Set a flag in readdir request, which indicates that client interprets
'end/complete' as bit flags. So that mds can reply additional flags in
readdir reply.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-04-27 17:48:30 +08:00 committed by Ilya Dryomov
parent 2a5beea3f1
commit 956d39d631
4 changed files with 20 additions and 3 deletions
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2
fs/ceph/dir.c
View File

@ -365,6 +365,8 @@ more:
req->r_readdir_cache_idx = fi->readdir_cache_idx;
req->r_readdir_offset = fi->next_offset;
req->r_args.readdir.frag = cpu_to_le32(frag);
req->r_args.readdir.flags =
cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
req->r_inode = inode;
ihold(inode);

7
fs/ceph/mds_client.c
View File

@ -181,8 +181,11 @@ static int parse_reply_info_dir(void **p, void *end,
ceph_decode_need(p, end, sizeof(num) + 2, bad);
num = ceph_decode_32(p);
info->dir_end = ceph_decode_8(p);
info->dir_complete = ceph_decode_8(p);
{
u16 flags = ceph_decode_16(p);
info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
}
if (num == 0)
goto done;

2
fs/ceph/mds_client.h
View File

@ -80,7 +80,7 @@ struct ceph_mds_reply_info_parsed {
struct ceph_mds_reply_dirfrag *dir_dir;
size_t dir_buf_size;
int dir_nr;
u8 dir_complete, dir_end;
bool dir_complete, dir_end;
struct ceph_mds_reply_dir_entry *dir_entries;
};

12
include/linux/ceph/ceph_fs.h
View File

@ -347,6 +347,17 @@ extern const char *ceph_mds_op_name(int op);
#define CEPH_XATTR_REPLACE (1 << 1)
#define CEPH_XATTR_REMOVE (1 << 31)
/*
* readdir request flags;
*/
#define CEPH_READDIR_REPLY_BITFLAGS (1<<0)
/*
* readdir reply flags.
*/
#define CEPH_READDIR_FRAG_END (1<<0)
#define CEPH_READDIR_FRAG_COMPLETE (1<<8)
union ceph_mds_request_args {
struct {
__le32 mask; /* CEPH_CAP_* */
@ -364,6 +375,7 @@ union ceph_mds_request_args {
__le32 frag; /* which dir fragment */
__le32 max_entries; /* how many dentries to grab */
__le32 max_bytes;
__le16 flags;
} __attribute__ ((packed)) readdir;
struct {
__le32 mode;