linux/fs/afs
Oleg Nesterov 1702e0654c afs: fix the usage of read_seqbegin_or_lock() in afs_find_server*()
David Howells says:

 (5) afs_find_server().

     There could be a lot of servers in the list and each server can have
     multiple addresses, so I think this would be better with an exclusive
     second pass.

     The server list isn't likely to change all that often, but when it does
     change, there's a good chance several servers are going to be
     added/removed one after the other.  Further, this is only going to be
     used for incoming cache management/callback requests from the server,
     which hopefully aren't going to happen too often - but it is remotely
     drivable.

 (6) afs_find_server_by_uuid().

     Similarly to (5), there could be a lot of servers to search through, but
     they are in a tree not a flat list, so it should be faster to process.
     Again, it's not likely to change that often and, again, when it does
     change it's likely to involve multiple changes.  This can be driven
     remotely by an incoming cache management request but is mostly going to
     be driven by setting up or reconfiguring a volume's server list -
     something that also isn't likely to happen often.

Make the "seq" counter odd on the 2nd pass, otherwise read_seqbegin_or_lock()
never takes the lock.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/20231130115614.GA21581@redhat.com/
2023-12-24 15:22:48 +00:00
..
addr_list.c afs: Use kfree_rcu() instead of casting kfree() to rcu_callback_t 2020-03-13 10:47:33 -07:00
afs_cm.h
afs_fs.h
afs_vl.h afs: Implement client support for the YFSVL.GetCellName RPC op 2020-06-04 15:37:57 +01:00
afs.h rxrpc: Fix timeout of a call that hasn't yet been granted a channel 2023-05-01 07:43:19 +01:00
callback.c afs: fix the usage of read_seqbegin_or_lock() in afs_lookup_volume_rcu() 2023-12-24 15:22:47 +00:00
cell.c afs: Fix overwriting of result of DNS query 2023-12-21 09:57:43 -08:00
cmservice.c rxrpc: Tidy up abort generation infrastructure 2023-01-06 09:43:32 +00:00
dir_edit.c afs: fix the afs_dir_get_folio return value 2023-05-06 10:10:08 -07:00
dir_silly.c netfs: Fix gcc-12 warning by embedding vfs inode in netfs_i_context 2022-06-09 13:55:00 -07:00
dir.c afs: Fix setting of mtime when creating a file/dir/symlink 2023-06-07 09:03:12 -07:00
dynroot.c afs: Fix dynamic root lookup DNS check 2023-12-20 11:57:47 +00:00
file.c splice: Use filemap_splice_read() instead of generic_file_splice_read() 2023-05-24 08:42:17 -06:00
flock.c fs: remove locks_inode 2023-01-11 06:52:43 -05:00
fs_operation.c netfs: Fix gcc-12 warning by embedding vfs inode in netfs_i_context 2022-06-09 13:55:00 -07:00
fs_probe.c afs: Fix lost servers_outstanding count 2022-12-22 11:40:35 +00:00
fsclient.c afs: Use the operation issue time instead of the reply time for callbacks 2022-09-01 11:44:13 +01:00
inode.c afs: convert to new timestamp accessors 2023-10-18 13:26:18 +02:00
internal.h afs: Fix use-after-free due to get/remove race in volume tree 2023-12-21 10:16:07 -08:00
Kconfig afs: Convert afs to use the new fscache API 2022-01-07 13:44:47 +00:00
main.c arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
Makefile afs: Convert afs to use the new fscache API 2022-01-07 13:44:47 +00:00
misc.c afs: Return -EAGAIN, not -EREMOTEIO, when a file already locked 2022-09-06 21:33:01 -04:00
mntpt.c afs: Remove check of PageError 2022-06-29 08:51:06 -04:00
proc.c afs: Use refcount_t rather than atomic_t 2022-08-02 18:10:11 +01:00
protocol_afs.h afs: Fix corruption in reads at fpos 2G-4G from an OpenAFS server 2021-09-13 09:14:21 +01:00
protocol_uae.h
protocol_yfs.h afs: Fix corruption in reads at fpos 2G-4G from an OpenAFS server 2021-09-13 09:14:21 +01:00
rotate.c afs: Adjust ACK interpretation to try and cope with NAT 2022-05-22 21:03:02 +01:00
rxrpc.c afs: Fix refcount underflow from error handling race 2023-12-11 15:40:41 -08:00
security.c fs: port ->permission() to pass mnt_idmap 2023-01-19 09:24:28 +01:00
server_list.c afs: Fix afs_server_list to be cleaned up with RCU 2023-11-17 07:55:27 +00:00
server.c afs: fix the usage of read_seqbegin_or_lock() in afs_find_server*() 2023-12-24 15:22:48 +00:00
super.c afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY 2023-11-24 14:52:24 +00:00
vl_alias.c afs: Add tracing for cell refcount and active user count 2020-10-16 14:39:21 +01:00
vl_list.c afs: Use refcount_t rather than atomic_t 2022-08-02 18:10:11 +01:00
vl_probe.c afs: Fix vlserver probe RTT handling 2023-06-16 14:43:41 -07:00
vl_rotate.c afs: Return ENOENT if no cell DNS record can be found 2023-11-24 14:51:18 +00:00
vlclient.c afs: Fix fall-through warnings for Clang 2021-05-25 07:30:34 -10:00
volume.c afs: Fix use-after-free due to get/remove race in volume tree 2023-12-21 10:16:07 -08:00
write.c afs: convert to new timestamp accessors 2023-10-18 13:26:18 +02:00
xattr.c afs: move afs_xattr_handlers to .rodata 2023-10-09 16:24:16 +02:00
xdr_fs.h afs: Fix directory entry size calculation 2021-01-04 12:25:19 +00:00
yfsclient.c afs: Use the operation issue time instead of the reply time for callbacks 2022-09-01 11:44:13 +01:00