summaryrefslogtreecommitdiff
path: root/fs/cifs/file.c
diff options
context:
space:
mode:
authorGermano Percossi <germano.percossi@citrix.com>2017-04-07 12:29:38 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-21 09:31:19 +0200
commit730fecb3401f8a7cc84e8d7b454976efdfdc65c9 (patch)
treeb9445e8fd2449e3e746aaff0019430df4a5c83a2 /fs/cifs/file.c
parent3d8d2f2344767cbab597027e2cde21d1a8b32cca (diff)
CIFS: store results of cifs_reopen_file to avoid infinite wait
commit 1fa839b4986d648b907d117275869a0e46c324b9 upstream. This fixes Continuous Availability when errors during file reopen are encountered. cifs_user_readv and cifs_user_writev would wait for ever if results of cifs_reopen_file are not stored and for later inspection. In fact, results are checked and, in case of errors, a chain of function calls leading to reads and writes to be scheduled in a separate thread is skipped. These threads will wake up the corresponding waiters once reads and writes are done. However, given the return value is not stored, when rc is checked for errors a previous one (always zero) is inspected instead. This leads to pending reads/writes added to the list, making cifs_user_readv and cifs_user_writev wait for ever. Signed-off-by: Germano Percossi <germano.percossi@citrix.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/cifs/file.c')
-rw-r--r--fs/cifs/file.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 1cd0e2eefc66..3925758f6dde 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2597,7 +2597,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
wdata->credits = credits;
if (!wdata->cfile->invalidHandle ||
- !cifs_reopen_file(wdata->cfile, false))
+ !(rc = cifs_reopen_file(wdata->cfile, false)))
rc = server->ops->async_writev(wdata,
cifs_uncached_writedata_release);
if (rc) {
@@ -3002,7 +3002,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
rdata->credits = credits;
if (!rdata->cfile->invalidHandle ||
- !cifs_reopen_file(rdata->cfile, true))
+ !(rc = cifs_reopen_file(rdata->cfile, true)))
rc = server->ops->async_readv(rdata);
error:
if (rc) {
@@ -3577,7 +3577,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
}
if (!rdata->cfile->invalidHandle ||
- !cifs_reopen_file(rdata->cfile, true))
+ !(rc = cifs_reopen_file(rdata->cfile, true)))
rc = server->ops->async_readv(rdata);
if (rc) {
add_credits_and_wake_if(server, rdata->credits, 0);