From: Mike Christie <mchristi@redhat.com> To: bvanassche@acm.org, bstroesser@ts.fujitsu.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Subject: [PATCH 00/11] target: add sysfs support Date: Tue, 28 Apr 2020 06:10:58 +0000 [thread overview] Message-ID: <20200428061109.3042-1-mchristi@redhat.com> (raw) The following patches made over Linus's current tree allow lio to export info about structs that the kernel initiates creation of via events like initiator login where there is no user interaction like a mkdir. These patches specificially focus on the I_T_nexus/session but could be used for other objects if we want. Why sysfs when we have configfs? I started with configfs and hit bugs like: commit cc57c07343bd071cdf1915a91a24ab7d40c9b590 Author: Mike Christie <mchristi@redhat.com> Date: Sun Jul 15 18:16:17 2018 -0500 configfs: fix registered group removal but it turns out that bug was not really a bug and was just how configfs was meant to work. It seems it was not meant to be used where the kernel initiates creation of dirs/files as a result of some internal action. It's more geared to the user initiating the creation, and my patch just lead to other bugs and was reverted: commit f19e4ed1e1edbfa3c9ccb9fed17759b7d6db24c6 Author: Al Viro <viro@zeniv.linux.org.uk> Date: Thu Aug 29 23:13:30 2019 -0400 configfs_register_group() shouldn't be (and isn't) called in rmdirable parts So to export the session info we have debugfs, sysfs, ioctl, netlink, etc. sysfs just seemed like a decent fit since one of the primary users is rtslib and it already has lots of file/dir handling code. V3: - drop format field - delay tpg deletion to allow fabric modules time to remove their sessions. - Added root sessions dir for easier lookup if userspace has the session id. - add session symlink - use simple ida. - Fix goto use. Actually moved sysfs addition call to after nego to avoid sysfs additions when login ends up failing. - Dropped target_setup_session callback fixups and dropped the init/free session callback for now. It's not immediately needed for this base session sysfs info support. V2: - rename top level dir to scsi_target - Fix extra newline - Copy data that's exported to sysfs so we do not have to worry about configfs and sysfs refcounts. - Export session info needed for tracking sessions in userspace and handling commands like PGRs there (still needs a way to notify userspace when sessions are added/deleted, but that will be a different set since the focus is different).
WARNING: multiple messages have this Message-ID (diff)
From: Mike Christie <mchristi@redhat.com> To: bvanassche@acm.org, bstroesser@ts.fujitsu.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Subject: [PATCH 00/11] target: add sysfs support Date: Tue, 28 Apr 2020 01:10:58 -0500 [thread overview] Message-ID: <20200428061109.3042-1-mchristi@redhat.com> (raw) The following patches made over Linus's current tree allow lio to export info about structs that the kernel initiates creation of via events like initiator login where there is no user interaction like a mkdir. These patches specificially focus on the I_T_nexus/session but could be used for other objects if we want. Why sysfs when we have configfs? I started with configfs and hit bugs like: commit cc57c07343bd071cdf1915a91a24ab7d40c9b590 Author: Mike Christie <mchristi@redhat.com> Date: Sun Jul 15 18:16:17 2018 -0500 configfs: fix registered group removal but it turns out that bug was not really a bug and was just how configfs was meant to work. It seems it was not meant to be used where the kernel initiates creation of dirs/files as a result of some internal action. It's more geared to the user initiating the creation, and my patch just lead to other bugs and was reverted: commit f19e4ed1e1edbfa3c9ccb9fed17759b7d6db24c6 Author: Al Viro <viro@zeniv.linux.org.uk> Date: Thu Aug 29 23:13:30 2019 -0400 configfs_register_group() shouldn't be (and isn't) called in rmdirable parts So to export the session info we have debugfs, sysfs, ioctl, netlink, etc. sysfs just seemed like a decent fit since one of the primary users is rtslib and it already has lots of file/dir handling code. V3: - drop format field - delay tpg deletion to allow fabric modules time to remove their sessions. - Added root sessions dir for easier lookup if userspace has the session id. - add session symlink - use simple ida. - Fix goto use. Actually moved sysfs addition call to after nego to avoid sysfs additions when login ends up failing. - Dropped target_setup_session callback fixups and dropped the init/free session callback for now. It's not immediately needed for this base session sysfs info support. V2: - rename top level dir to scsi_target - Fix extra newline - Copy data that's exported to sysfs so we do not have to worry about configfs and sysfs refcounts. - Export session info needed for tracking sessions in userspace and handling commands like PGRs there (still needs a way to notify userspace when sessions are added/deleted, but that will be a different set since the focus is different).
next reply other threads:[~2020-04-28 6:10 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-28 6:10 Mike Christie [this message] 2020-04-28 6:10 ` [PATCH 00/11] target: add sysfs support Mike Christie 2020-04-28 6:10 ` [PATCH 01/11] target: check enforce_pr_isids during registration Mike Christie 2020-04-28 6:10 ` Mike Christie 2020-04-28 6:11 ` [PATCH 02/11] target: separate acl name from port ids Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 16:14 ` Bart Van Assche 2020-04-28 16:14 ` Bart Van Assche 2020-04-28 6:11 ` [PATCH 03/11] iscsi target: setup transport_id Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 6:11 ` [PATCH 04/11] target: use tpid in target_stat_iport_port_ident_show Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 6:11 ` [PATCH 05/11] target: drop sess_get_initiator_sid from PR code Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 6:11 ` [PATCH 06/11] target: drop sess_get_initiator_sid Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 16:25 ` Bart Van Assche 2020-04-28 16:25 ` Bart Van Assche 2020-04-28 6:11 ` [PATCH 07/11] target: add sysfs support Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 16:29 ` Bart Van Assche 2020-04-28 16:29 ` Bart Van Assche 2020-04-28 16:33 ` Mike Christie 2020-04-28 16:33 ` Mike Christie 2020-04-28 6:11 ` [PATCH 08/11] target: add sysfs session helper functions Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 16:43 ` Bart Van Assche 2020-04-28 16:43 ` Bart Van Assche 2020-04-28 17:06 ` Mike Christie 2020-04-28 17:06 ` Mike Christie 2020-04-28 6:11 ` [PATCH 09/11] target: add target_setup_session sysfs support Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 6:11 ` [PATCH 10/11] iscsi target: use session sysfs helpers Mike Christie 2020-04-28 6:11 ` Mike Christie 2020-04-28 6:11 ` [PATCH 11/11] target: drop sess_get_index Mike Christie 2020-04-28 6:11 ` Mike Christie
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