@@ -1104,7 +1104,7 @@ struct file_system_type cifs_fs_type = {
.init_fs_context = smb3_init_fs_context,
.parameters = smb3_fs_parameters,
.kill_sb = cifs_kill_sb,
- .fs_flags = FS_RENAME_DOES_D_MOVE,
+ .fs_flags = FS_RENAME_DOES_D_MOVE | FS_AUTOFREEZE,
};
MODULE_ALIAS_FS("cifs");
@@ -1114,7 +1114,7 @@ struct file_system_type smb3_fs_type = {
.init_fs_context = smb3_init_fs_context,
.parameters = smb3_fs_parameters,
.kill_sb = cifs_kill_sb,
- .fs_flags = FS_RENAME_DOES_D_MOVE,
+ .fs_flags = FS_RENAME_DOES_D_MOVE | FS_AUTOFREEZE,
};
MODULE_ALIAS_FS("smb3");
MODULE_ALIAS("smb3");
@@ -1668,7 +1668,7 @@ init_cifs(void)
CIFS_MAX_REQ);
}
- cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ cifsiod_wq = alloc_workqueue("cifsiod", WQ_MEM_RECLAIM, 0);
if (!cifsiod_wq) {
rc = -ENOMEM;
goto out_clean_proc;
@@ -1682,28 +1682,28 @@ init_cifs(void)
/* WQ_UNBOUND allows decrypt tasks to run on any CPU */
decrypt_wq = alloc_workqueue("smb3decryptd",
- WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
if (!decrypt_wq) {
rc = -ENOMEM;
goto out_destroy_cifsiod_wq;
}
fileinfo_put_wq = alloc_workqueue("cifsfileinfoput",
- WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
if (!fileinfo_put_wq) {
rc = -ENOMEM;
goto out_destroy_decrypt_wq;
}
cifsoplockd_wq = alloc_workqueue("cifsoplockd",
- WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ WQ_MEM_RECLAIM, 0);
if (!cifsoplockd_wq) {
rc = -ENOMEM;
goto out_destroy_fileinfo_put_wq;
}
deferredclose_wq = alloc_workqueue("deferredclose",
- WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
+ WQ_MEM_RECLAIM, 0);
if (!deferredclose_wq) {
rc = -ENOMEM;
goto out_destroy_cifsoplockd_wq;
@@ -375,7 +375,6 @@ static int __cifs_reconnect(struct TCP_Server_Info *server,
cifs_abort_connection(server);
do {
- try_to_freeze();
cifs_server_lock(server);
if (!cifs_swn_set_server_dstaddr(server)) {
@@ -504,7 +503,6 @@ static int reconnect_dfs_server(struct TCP_Server_Info *server)
cifs_abort_connection(server);
do {
- try_to_freeze();
cifs_server_lock(server);
rc = reconnect_target_unlocked(server, &tl, &target_hint);
@@ -678,8 +676,6 @@ cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
int total_read;
for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
- try_to_freeze();
-
/* reconnect if no credits and no requests in flight */
if (zero_credits(server)) {
cifs_reconnect(server, false);
@@ -1132,12 +1128,8 @@ cifs_demultiplex_thread(void *p)
if (length > 1)
mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
- set_freezable();
allow_kernel_signal(SIGKILL);
while (server->tcpStatus != CifsExiting) {
- if (try_to_freeze())
- continue;
-
if (!allocate_buffers(server))
continue;
@@ -376,7 +376,7 @@ int dfs_cache_init(void)
int rc;
int i;
- dfscache_wq = alloc_workqueue("cifs-dfscache", WQ_FREEZABLE | WQ_UNBOUND, 1);
+ dfscache_wq = alloc_workqueue("cifs-dfscache", WQ_UNBOUND, 1);
if (!dfscache_wq)
return -ENOMEM;
The kernel power management now supports allowing the VFS to handle filesystem freezing freezes and thawing. Take advantage of that and remove the kthread freezing. This is needed so that we properly really stop IO in flight without races after userspace has been frozen. Without this we rely on kthread freezing and its semantics are loose and error prone. The filesystem therefore is in charge of properly dealing with quiescing of the filesystem through its callbacks if it thinks it knows better than how the VFS handles it. The following Coccinelle rule was used as to remove the now superflous freezer calls: spatch --sp-file fs-freeze-cleanup.cocci --in-place --timeout 120 --dir fs/cifs --jobs 12 --use-gitgrep @ remove_set_freezable @ expression time; statement S, S2; expression task, current; @@ ( - set_freezable(); | - if (try_to_freeze()) - continue; | - try_to_freeze(); | - freezable_schedule(); + schedule(); | - freezable_schedule_timeout(time); + schedule_timeout(time); | - if (freezing(task)) { S } | - if (freezing(task)) { S } - else { S2 } | - freezing(current) ) @ remove_wq_freezable @ expression WQ_E, WQ_ARG1, WQ_ARG2, WQ_ARG3, WQ_ARG4; identifier fs_wq_fn; @@ ( WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_FREEZABLE, + WQ_ARG2, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_FREEZABLE | WQ_ARG3, + WQ_ARG2 | WQ_ARG3, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_ARG3 | WQ_FREEZABLE, + WQ_ARG2 | WQ_ARG3, ...); | WQ_E = alloc_workqueue(WQ_ARG1, - WQ_ARG2 | WQ_ARG3 | WQ_FREEZABLE | WQ_ARG4, + WQ_ARG2 | WQ_ARG3 | WQ_ARG4, ...); | WQ_E = - WQ_ARG1 | WQ_FREEZABLE + WQ_ARG1 | WQ_E = - WQ_ARG1 | WQ_FREEZABLE | WQ_ARG3 + WQ_ARG1 | WQ_ARG3 | fs_wq_fn( - WQ_FREEZABLE | WQ_ARG2 | WQ_ARG3 + WQ_ARG2 | WQ_ARG3 ) | fs_wq_fn( - WQ_FREEZABLE | WQ_ARG2 + WQ_ARG2 ) | fs_wq_fn( - WQ_FREEZABLE + 0 ) ) @ add_auto_flag @ expression E1; identifier fs_type; @@ struct file_system_type fs_type = { .fs_flags = E1 + | FS_AUTOFREEZE , }; Generated-by: Coccinelle SmPL Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> --- fs/cifs/cifsfs.c | 14 +++++++------- fs/cifs/connect.c | 8 -------- fs/cifs/dfs_cache.c | 2 +- 3 files changed, 8 insertions(+), 16 deletions(-)