forked from Minki/linux
72f02ba66b
This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx, hisi_sas, smartpqi, megaraid_sas, arcmsr. In addition, with the continuing absence of Nic we have target updates for tcmu and target core (all with reviews and acks). The biggest observable change is going to be that we're (again) trying to switch to mulitqueue as the default (a user can still override the setting on the kernel command line). Other major core stuff is the removal of the remaining Microchannel drivers, an update of the internal timers and some reworks of completion and result handling. Signed-off-by: James E.J. Bottomley <jejb@linux.vnet.ibm.com> -----BEGIN PGP SIGNATURE----- iJwEABMIAEQWIQTnYEDbdso9F2cI+arnQslM7pishQUCW3R3niYcamFtZXMuYm90 dG9tbGV5QGhhbnNlbnBhcnRuZXJzaGlwLmNvbQAKCRDnQslM7pishauRAP4yfBKK dbxF81c/Bxi/Stk16FWkOOrjs4CizwmnMcpM5wD/UmM9o6ebDzaYpZgA8wIl7X/N o/JckEZZpIp+5NySZNc= =ggLB -----END PGP SIGNATURE----- Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi Pull SCSI updates from James Bottomley: "This is mostly updates to the usual drivers: mpt3sas, lpfc, qla2xxx, hisi_sas, smartpqi, megaraid_sas, arcmsr. In addition, with the continuing absence of Nic we have target updates for tcmu and target core (all with reviews and acks). The biggest observable change is going to be that we're (again) trying to switch to mulitqueue as the default (a user can still override the setting on the kernel command line). Other major core stuff is the removal of the remaining Microchannel drivers, an update of the internal timers and some reworks of completion and result handling" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (203 commits) scsi: core: use blk_mq_run_hw_queues in scsi_kick_queue scsi: ufs: remove unnecessary query(DM) UPIU trace scsi: qla2xxx: Fix issue reported by static checker for qla2x00_els_dcmd2_sp_done() scsi: aacraid: Spelling fix in comment scsi: mpt3sas: Fix calltrace observed while running IO & reset scsi: aic94xx: fix an error code in aic94xx_init() scsi: st: remove redundant pointer STbuffer scsi: qla2xxx: Update driver version to 10.00.00.08-k scsi: qla2xxx: Migrate NVME N2N handling into state machine scsi: qla2xxx: Save frame payload size from ICB scsi: qla2xxx: Fix stalled relogin scsi: qla2xxx: Fix race between switch cmd completion and timeout scsi: qla2xxx: Fix Management Server NPort handle reservation logic scsi: qla2xxx: Flush mailbox commands on chip reset scsi: qla2xxx: Fix unintended Logout scsi: qla2xxx: Fix session state stuck in Get Port DB scsi: qla2xxx: Fix redundant fc_rport registration scsi: qla2xxx: Silent erroneous message scsi: qla2xxx: Prevent sysfs access when chip is down scsi: qla2xxx: Add longer window for chip reset ...
559 lines
14 KiB
C
559 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/sysfs/file.c - sysfs regular (text) file implementation
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*
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* Copyright (c) 2001-3 Patrick Mochel
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*
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* Please see Documentation/filesystems/sysfs.txt for more information.
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*/
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include "sysfs.h"
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#include "../kernfs/kernfs-internal.h"
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/*
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* Determine ktype->sysfs_ops for the given kernfs_node. This function
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* must be called while holding an active reference.
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*/
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static const struct sysfs_ops *sysfs_file_ops(struct kernfs_node *kn)
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{
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struct kobject *kobj = kn->parent->priv;
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if (kn->flags & KERNFS_LOCKDEP)
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lockdep_assert_held(kn);
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return kobj->ktype ? kobj->ktype->sysfs_ops : NULL;
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}
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/*
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* Reads on sysfs are handled through seq_file, which takes care of hairy
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* details like buffering and seeking. The following function pipes
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* sysfs_ops->show() result through seq_file.
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*/
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static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
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{
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struct kernfs_open_file *of = sf->private;
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struct kobject *kobj = of->kn->parent->priv;
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const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
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ssize_t count;
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char *buf;
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/* acquire buffer and ensure that it's >= PAGE_SIZE and clear */
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count = seq_get_buf(sf, &buf);
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if (count < PAGE_SIZE) {
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seq_commit(sf, -1);
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return 0;
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}
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memset(buf, 0, PAGE_SIZE);
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/*
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* Invoke show(). Control may reach here via seq file lseek even
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* if @ops->show() isn't implemented.
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*/
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if (ops->show) {
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count = ops->show(kobj, of->kn->priv, buf);
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if (count < 0)
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return count;
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}
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/*
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* The code works fine with PAGE_SIZE return but it's likely to
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* indicate truncated result or overflow in normal use cases.
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*/
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if (count >= (ssize_t)PAGE_SIZE) {
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printk("fill_read_buffer: %pS returned bad count\n",
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ops->show);
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/* Try to struggle along */
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count = PAGE_SIZE - 1;
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}
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seq_commit(sf, count);
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return 0;
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}
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static ssize_t sysfs_kf_bin_read(struct kernfs_open_file *of, char *buf,
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size_t count, loff_t pos)
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{
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struct bin_attribute *battr = of->kn->priv;
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struct kobject *kobj = of->kn->parent->priv;
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loff_t size = file_inode(of->file)->i_size;
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if (!count)
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return 0;
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if (size) {
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if (pos >= size)
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return 0;
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if (pos + count > size)
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count = size - pos;
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}
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if (!battr->read)
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return -EIO;
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return battr->read(of->file, kobj, battr, buf, pos, count);
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}
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/* kernfs read callback for regular sysfs files with pre-alloc */
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static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
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size_t count, loff_t pos)
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{
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const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
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struct kobject *kobj = of->kn->parent->priv;
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ssize_t len;
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/*
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* If buf != of->prealloc_buf, we don't know how
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* large it is, so cannot safely pass it to ->show
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*/
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if (WARN_ON_ONCE(buf != of->prealloc_buf))
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return 0;
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len = ops->show(kobj, of->kn->priv, buf);
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if (len < 0)
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return len;
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if (pos) {
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if (len <= pos)
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return 0;
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len -= pos;
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memmove(buf, buf + pos, len);
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}
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return min_t(ssize_t, count, len);
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}
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/* kernfs write callback for regular sysfs files */
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static ssize_t sysfs_kf_write(struct kernfs_open_file *of, char *buf,
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size_t count, loff_t pos)
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{
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const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
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struct kobject *kobj = of->kn->parent->priv;
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if (!count)
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return 0;
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return ops->store(kobj, of->kn->priv, buf, count);
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}
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/* kernfs write callback for bin sysfs files */
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static ssize_t sysfs_kf_bin_write(struct kernfs_open_file *of, char *buf,
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size_t count, loff_t pos)
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{
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struct bin_attribute *battr = of->kn->priv;
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struct kobject *kobj = of->kn->parent->priv;
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loff_t size = file_inode(of->file)->i_size;
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if (size) {
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if (size <= pos)
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return -EFBIG;
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count = min_t(ssize_t, count, size - pos);
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}
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if (!count)
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return 0;
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if (!battr->write)
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return -EIO;
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return battr->write(of->file, kobj, battr, buf, pos, count);
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}
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static int sysfs_kf_bin_mmap(struct kernfs_open_file *of,
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struct vm_area_struct *vma)
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{
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struct bin_attribute *battr = of->kn->priv;
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struct kobject *kobj = of->kn->parent->priv;
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return battr->mmap(of->file, kobj, battr, vma);
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}
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void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr)
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{
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struct kernfs_node *kn = kobj->sd, *tmp;
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if (kn && dir)
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kn = kernfs_find_and_get(kn, dir);
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else
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kernfs_get(kn);
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if (kn && attr) {
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tmp = kernfs_find_and_get(kn, attr);
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kernfs_put(kn);
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kn = tmp;
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}
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if (kn) {
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kernfs_notify(kn);
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kernfs_put(kn);
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}
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}
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EXPORT_SYMBOL_GPL(sysfs_notify);
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static const struct kernfs_ops sysfs_file_kfops_empty = {
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};
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static const struct kernfs_ops sysfs_file_kfops_ro = {
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.seq_show = sysfs_kf_seq_show,
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};
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static const struct kernfs_ops sysfs_file_kfops_wo = {
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.write = sysfs_kf_write,
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};
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static const struct kernfs_ops sysfs_file_kfops_rw = {
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.seq_show = sysfs_kf_seq_show,
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.write = sysfs_kf_write,
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};
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static const struct kernfs_ops sysfs_prealloc_kfops_ro = {
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.read = sysfs_kf_read,
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.prealloc = true,
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};
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static const struct kernfs_ops sysfs_prealloc_kfops_wo = {
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.write = sysfs_kf_write,
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.prealloc = true,
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};
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static const struct kernfs_ops sysfs_prealloc_kfops_rw = {
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.read = sysfs_kf_read,
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.write = sysfs_kf_write,
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.prealloc = true,
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};
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static const struct kernfs_ops sysfs_bin_kfops_ro = {
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.read = sysfs_kf_bin_read,
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};
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static const struct kernfs_ops sysfs_bin_kfops_wo = {
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.write = sysfs_kf_bin_write,
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};
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static const struct kernfs_ops sysfs_bin_kfops_rw = {
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.read = sysfs_kf_bin_read,
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.write = sysfs_kf_bin_write,
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};
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static const struct kernfs_ops sysfs_bin_kfops_mmap = {
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.read = sysfs_kf_bin_read,
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.write = sysfs_kf_bin_write,
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.mmap = sysfs_kf_bin_mmap,
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};
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int sysfs_add_file_mode_ns(struct kernfs_node *parent,
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const struct attribute *attr, bool is_bin,
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umode_t mode, kuid_t uid, kgid_t gid, const void *ns)
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{
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struct lock_class_key *key = NULL;
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const struct kernfs_ops *ops;
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struct kernfs_node *kn;
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loff_t size;
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if (!is_bin) {
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struct kobject *kobj = parent->priv;
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const struct sysfs_ops *sysfs_ops = kobj->ktype->sysfs_ops;
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/* every kobject with an attribute needs a ktype assigned */
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if (WARN(!sysfs_ops, KERN_ERR
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"missing sysfs attribute operations for kobject: %s\n",
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kobject_name(kobj)))
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return -EINVAL;
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if (sysfs_ops->show && sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_rw;
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else
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ops = &sysfs_file_kfops_rw;
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} else if (sysfs_ops->show) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_ro;
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else
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ops = &sysfs_file_kfops_ro;
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} else if (sysfs_ops->store) {
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if (mode & SYSFS_PREALLOC)
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ops = &sysfs_prealloc_kfops_wo;
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else
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ops = &sysfs_file_kfops_wo;
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} else
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ops = &sysfs_file_kfops_empty;
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size = PAGE_SIZE;
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} else {
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struct bin_attribute *battr = (void *)attr;
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if (battr->mmap)
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ops = &sysfs_bin_kfops_mmap;
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else if (battr->read && battr->write)
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ops = &sysfs_bin_kfops_rw;
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else if (battr->read)
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ops = &sysfs_bin_kfops_ro;
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else if (battr->write)
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ops = &sysfs_bin_kfops_wo;
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else
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ops = &sysfs_file_kfops_empty;
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size = battr->size;
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}
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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if (!attr->ignore_lockdep)
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key = attr->key ?: (struct lock_class_key *)&attr->skey;
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#endif
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kn = __kernfs_create_file(parent, attr->name, mode & 0777, uid, gid,
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size, ops, (void *)attr, ns, key);
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if (IS_ERR(kn)) {
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if (PTR_ERR(kn) == -EEXIST)
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sysfs_warn_dup(parent, attr->name);
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return PTR_ERR(kn);
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}
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return 0;
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}
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/**
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* sysfs_create_file_ns - create an attribute file for an object with custom ns
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* @kobj: object we're creating for
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* @attr: attribute descriptor
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* @ns: namespace the new file should belong to
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*/
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int sysfs_create_file_ns(struct kobject *kobj, const struct attribute *attr,
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const void *ns)
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{
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kuid_t uid;
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kgid_t gid;
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BUG_ON(!kobj || !kobj->sd || !attr);
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kobject_get_ownership(kobj, &uid, &gid);
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return sysfs_add_file_mode_ns(kobj->sd, attr, false, attr->mode,
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uid, gid, ns);
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}
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EXPORT_SYMBOL_GPL(sysfs_create_file_ns);
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int sysfs_create_files(struct kobject *kobj, const struct attribute **ptr)
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{
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int err = 0;
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int i;
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for (i = 0; ptr[i] && !err; i++)
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err = sysfs_create_file(kobj, ptr[i]);
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if (err)
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while (--i >= 0)
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sysfs_remove_file(kobj, ptr[i]);
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return err;
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}
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EXPORT_SYMBOL_GPL(sysfs_create_files);
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/**
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* sysfs_add_file_to_group - add an attribute file to a pre-existing group.
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* @kobj: object we're acting for.
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* @attr: attribute descriptor.
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* @group: group name.
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*/
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int sysfs_add_file_to_group(struct kobject *kobj,
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const struct attribute *attr, const char *group)
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{
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struct kernfs_node *parent;
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kuid_t uid;
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kgid_t gid;
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int error;
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if (group) {
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parent = kernfs_find_and_get(kobj->sd, group);
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} else {
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parent = kobj->sd;
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kernfs_get(parent);
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}
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if (!parent)
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return -ENOENT;
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kobject_get_ownership(kobj, &uid, &gid);
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error = sysfs_add_file_mode_ns(parent, attr, false,
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attr->mode, uid, gid, NULL);
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kernfs_put(parent);
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return error;
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}
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EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
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/**
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* sysfs_chmod_file - update the modified mode value on an object attribute.
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* @kobj: object we're acting for.
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* @attr: attribute descriptor.
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* @mode: file permissions.
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*
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*/
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int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
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umode_t mode)
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{
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struct kernfs_node *kn;
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struct iattr newattrs;
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int rc;
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kn = kernfs_find_and_get(kobj->sd, attr->name);
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if (!kn)
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return -ENOENT;
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newattrs.ia_mode = (mode & S_IALLUGO) | (kn->mode & ~S_IALLUGO);
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newattrs.ia_valid = ATTR_MODE;
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rc = kernfs_setattr(kn, &newattrs);
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kernfs_put(kn);
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return rc;
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}
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EXPORT_SYMBOL_GPL(sysfs_chmod_file);
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/**
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* sysfs_break_active_protection - break "active" protection
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* @kobj: The kernel object @attr is associated with.
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* @attr: The attribute to break the "active" protection for.
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*
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* With sysfs, just like kernfs, deletion of an attribute is postponed until
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* all active .show() and .store() callbacks have finished unless this function
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* is called. Hence this function is useful in methods that implement self
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* deletion.
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*/
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struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr)
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{
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struct kernfs_node *kn;
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kobject_get(kobj);
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kn = kernfs_find_and_get(kobj->sd, attr->name);
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if (kn)
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kernfs_break_active_protection(kn);
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return kn;
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}
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EXPORT_SYMBOL_GPL(sysfs_break_active_protection);
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/**
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* sysfs_unbreak_active_protection - restore "active" protection
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* @kn: Pointer returned by sysfs_break_active_protection().
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*
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* Undo the effects of sysfs_break_active_protection(). Since this function
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* calls kernfs_put() on the kernfs node that corresponds to the 'attr'
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* argument passed to sysfs_break_active_protection() that attribute may have
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* been removed between the sysfs_break_active_protection() and
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* sysfs_unbreak_active_protection() calls, it is not safe to access @kn after
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* this function has returned.
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*/
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void sysfs_unbreak_active_protection(struct kernfs_node *kn)
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{
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struct kobject *kobj = kn->parent->priv;
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kernfs_unbreak_active_protection(kn);
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kernfs_put(kn);
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kobject_put(kobj);
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}
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EXPORT_SYMBOL_GPL(sysfs_unbreak_active_protection);
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/**
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* sysfs_remove_file_ns - remove an object attribute with a custom ns tag
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* @kobj: object we're acting for
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* @attr: attribute descriptor
|
|
* @ns: namespace tag of the file to remove
|
|
*
|
|
* Hash the attribute name and namespace tag and kill the victim.
|
|
*/
|
|
void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
|
|
const void *ns)
|
|
{
|
|
struct kernfs_node *parent = kobj->sd;
|
|
|
|
kernfs_remove_by_name_ns(parent, attr->name, ns);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysfs_remove_file_ns);
|
|
|
|
/**
|
|
* sysfs_remove_file_self - remove an object attribute from its own method
|
|
* @kobj: object we're acting for
|
|
* @attr: attribute descriptor
|
|
*
|
|
* See kernfs_remove_self() for details.
|
|
*/
|
|
bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr)
|
|
{
|
|
struct kernfs_node *parent = kobj->sd;
|
|
struct kernfs_node *kn;
|
|
bool ret;
|
|
|
|
kn = kernfs_find_and_get(parent, attr->name);
|
|
if (WARN_ON_ONCE(!kn))
|
|
return false;
|
|
|
|
ret = kernfs_remove_self(kn);
|
|
|
|
kernfs_put(kn);
|
|
return ret;
|
|
}
|
|
|
|
void sysfs_remove_files(struct kobject *kobj, const struct attribute **ptr)
|
|
{
|
|
int i;
|
|
for (i = 0; ptr[i]; i++)
|
|
sysfs_remove_file(kobj, ptr[i]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysfs_remove_files);
|
|
|
|
/**
|
|
* sysfs_remove_file_from_group - remove an attribute file from a group.
|
|
* @kobj: object we're acting for.
|
|
* @attr: attribute descriptor.
|
|
* @group: group name.
|
|
*/
|
|
void sysfs_remove_file_from_group(struct kobject *kobj,
|
|
const struct attribute *attr, const char *group)
|
|
{
|
|
struct kernfs_node *parent;
|
|
|
|
if (group) {
|
|
parent = kernfs_find_and_get(kobj->sd, group);
|
|
} else {
|
|
parent = kobj->sd;
|
|
kernfs_get(parent);
|
|
}
|
|
|
|
if (parent) {
|
|
kernfs_remove_by_name(parent, attr->name);
|
|
kernfs_put(parent);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysfs_remove_file_from_group);
|
|
|
|
/**
|
|
* sysfs_create_bin_file - create binary file for object.
|
|
* @kobj: object.
|
|
* @attr: attribute descriptor.
|
|
*/
|
|
int sysfs_create_bin_file(struct kobject *kobj,
|
|
const struct bin_attribute *attr)
|
|
{
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
BUG_ON(!kobj || !kobj->sd || !attr);
|
|
|
|
kobject_get_ownership(kobj, &uid, &gid);
|
|
return sysfs_add_file_mode_ns(kobj->sd, &attr->attr, true,
|
|
attr->attr.mode, uid, gid, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysfs_create_bin_file);
|
|
|
|
/**
|
|
* sysfs_remove_bin_file - remove binary file for object.
|
|
* @kobj: object.
|
|
* @attr: attribute descriptor.
|
|
*/
|
|
void sysfs_remove_bin_file(struct kobject *kobj,
|
|
const struct bin_attribute *attr)
|
|
{
|
|
kernfs_remove_by_name(kobj->sd, attr->attr.name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sysfs_remove_bin_file);
|