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AFS Fixes

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Merge tag 'afs-fixes-20231124' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:

 - Fix the afs_server_list struct to be cleaned up with RCU

 - Fix afs to translate a no-data result from a DNS lookup into ENOENT,
   not EDESTADDRREQ for consistency with OpenAFS

 - Fix afs to translate a negative DNS lookup result into ENOENT rather
   than EDESTADDRREQ

 - Fix file locking on R/O volumes to operate in local mode as the
   server doesn't handle exclusive locks on such files

 - Set SB_RDONLY on superblocks for RO and Backup volumes so that the
   VFS can see that they're read only

* tag 'afs-fixes-20231124' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY
  afs: Fix file locking on R/O volumes to operate in local mode
  afs: Return ENOENT if no cell DNS record can be found
  afs: Make error on cell lookup failure consistent with OpenAFS
  afs: Fix afs_server_list to be cleaned up with RCU
This commit is contained in:
Linus Torvalds 2023-11-24 10:40:03 -08:00
commit 5b7ad877e4
5 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/afs/dynroot.c
View File

@ -132,8 +132,8 @@ static int afs_probe_cell_name(struct dentry *dentry)
ret = dns_query(net->net, "afsdb", name, len, "srv=1",
NULL, NULL, false);
if (ret == -ENODATA)
ret = -EDESTADDRREQ;
if (ret == -ENODATA || ret == -ENOKEY)
ret = -ENOENT;
return ret;
}

1
fs/afs/internal.h
View File

@ -553,6 +553,7 @@ struct afs_server_entry {
};
struct afs_server_list {
struct rcu_head rcu;
afs_volid_t vids[AFS_MAXTYPES]; /* Volume IDs */
refcount_t usage;
unsigned char nr_servers;

2
fs/afs/server_list.c
View File

@ -17,7 +17,7 @@ void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist)
for (i = 0; i < slist->nr_servers; i++)
afs_unuse_server(net, slist->servers[i].server,
afs_server_trace_put_slist);
kfree(slist);
kfree_rcu(slist, rcu);
}
}

4
fs/afs/super.c
View File

@ -407,6 +407,10 @@ static int afs_validate_fc(struct fs_context *fc)
return PTR_ERR(volume);
ctx->volume = volume;
if (volume->type != AFSVL_RWVOL) {
ctx->flock_mode = afs_flock_mode_local;
fc->sb_flags |= SB_RDONLY;
}
}
return 0;

10
fs/afs/vl_rotate.c
View File

@ -58,6 +58,12 @@ static bool afs_start_vl_iteration(struct afs_vl_cursor *vc)
}
/* Status load is ordered after lookup counter load */
if (cell->dns_status == DNS_LOOKUP_GOT_NOT_FOUND) {
pr_warn("No record of cell %s\n", cell->name);
vc->error = -ENOENT;
return false;
}
if (cell->dns_source == DNS_RECORD_UNAVAILABLE) {
vc->error = -EDESTADDRREQ;
return false;
@ -285,6 +291,7 @@ failed:
*/
static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
{
struct afs_cell *cell = vc->cell;
static int count;
int i;
@ -294,6 +301,9 @@ static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
rcu_read_lock();
pr_notice("EDESTADDR occurred\n");
pr_notice("CELL: %s err=%d\n", cell->name, cell->error);
pr_notice("DNS: src=%u st=%u lc=%x\n",
cell->dns_source, cell->dns_status, cell->dns_lookup_count);
pr_notice("VC: ut=%lx ix=%u ni=%hu fl=%hx err=%hd\n",
vc->untried, vc->index, vc->nr_iterations, vc->flags, vc->error);