Looks good. Thanks! Reviewed-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx> -----Original Message----- From: Georgy Bystrenin <gkot@xxxxxxxxxx> Sent: Wednesday, December 19, 2018 9:15 AM To: linux-cifs@xxxxxxxxxxxxxxx Cc: Pavel Shilovskiy <pshilov@xxxxxxxxxxxxx>; Michael Shigorin <mike@xxxxxxxxxxxx>; Evgeny Sinelnikov <sin@xxxxxxxxxxxx> Subject: [PATCH] cifs: Fixed OFD locks do not conflict with eachother While resolving a bug with locks on samba shares found a strange behavior. When a file locked by one node and we trying to lock it from another node it fail with errno 5 (EIO) but in that case errno must be set to (EACCES | EAGAIN). This isn't happening when we try to lock file second time on same node. In this case it returns EACCES as expected. Also this issue not reproduces when we use SMB1 protocol (vers=1.0 in mount options). Further investigation showed that the mapping from status_to_posix_error is different for SMB1 and SMB2+ implementations. For SMB1 mapping is [NT_STATUS_LOCK_NOT_GRANTED to ERRlock] (https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ftorvalds%2Flinux%2Fblob%2Fmaster%2Ffs%2Fcifs%2Fnetmisc.c%23L66&data=02%7C01%7Cpshilov%40microsoft.com%7C32719cbffb6e4fa3a18208d665d588a8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636808365142084033&sdata=ymTs1OSE2HBAjH%2BcYb0rmsWNxAwp%2Beg23vOE%2B6HaQkU%3D&reserved=0) but for SMB2+ mapping is [STATUS_LOCK_NOT_GRANTED to -EIO] (https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Ftorvalds%2Flinux%2Fblob%2Fmaster%2Ffs%2Fcifs%2Fsmb2maperror.c%23L383&data=02%7C01%7Cpshilov%40microsoft.com%7C32719cbffb6e4fa3a18208d665d588a8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636808365142084033&sdata=hK5X5JyOJ0KGduL7Ty4cru51TOLrSaqNMY11Yeywy78%3D&reserved=0) Quick changes in SMB2+ mapping from EIO to EACCES has fixed issue. BUG: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.kernel.org%2Fshow_bug.cgi%3Fid%3D201971&data=02%7C01%7Cpshilov%40microsoft.com%7C32719cbffb6e4fa3a18208d665d588a8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636808365142084033&sdata=D4or6WC3MuSi31KpUfIpE%2BjDC6xSEBjJCMiMNDvC3cM%3D&reserved=0 Signed-off-by: Georgy A Bystrenin <gkot@xxxxxxxxxxxx> --- fs/cifs/smb2maperror.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/cifs/smb2maperror.c b/fs/cifs/smb2maperror.c index 62c88dfed57b..d7e839cb773f 100644 --- a/fs/cifs/smb2maperror.c +++ b/fs/cifs/smb2maperror.c @@ -378,8 +378,8 @@ static const struct status_to_posix_error smb2_error_map_table[] = { {STATUS_NONEXISTENT_EA_ENTRY, -EIO, "STATUS_NONEXISTENT_EA_ENTRY"}, {STATUS_NO_EAS_ON_FILE, -ENODATA, "STATUS_NO_EAS_ON_FILE"}, {STATUS_EA_CORRUPT_ERROR, -EIO, "STATUS_EA_CORRUPT_ERROR"}, - {STATUS_FILE_LOCK_CONFLICT, -EIO, "STATUS_FILE_LOCK_CONFLICT"}, - {STATUS_LOCK_NOT_GRANTED, -EIO, "STATUS_LOCK_NOT_GRANTED"}, + {STATUS_FILE_LOCK_CONFLICT, -EACCES, "STATUS_FILE_LOCK_CONFLICT"}, + {STATUS_LOCK_NOT_GRANTED, -EACCES, "STATUS_LOCK_NOT_GRANTED"}, {STATUS_DELETE_PENDING, -ENOENT, "STATUS_DELETE_PENDING"}, {STATUS_CTL_FILE_NOT_SUPPORTED, -ENOSYS, "STATUS_CTL_FILE_NOT_SUPPORTED"}, -- 2.17.1
