mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
95582b0083
struct timespec is not y2038 safe. Transition vfs to use y2038 safe struct timespec64 instead. The change was made with the help of the following cocinelle script. This catches about 80% of the changes. All the header file and logic changes are included in the first 5 rules. The rest are trivial substitutions. I avoid changing any of the function signatures or any other filesystem specific data structures to keep the patch simple for review. The script can be a little shorter by combining different cases. But, this version was sufficient for my usecase. virtual patch @ depends on patch @ identifier now; @@ - struct timespec + struct timespec64 current_time ( ... ) { - struct timespec now = current_kernel_time(); + struct timespec64 now = current_kernel_time64(); ... - return timespec_trunc( + return timespec64_trunc( ... ); } @ depends on patch @ identifier xtime; @@ struct \( iattr \| inode \| kstat \) { ... - struct timespec xtime; + struct timespec64 xtime; ... } @ depends on patch @ identifier t; @@ struct inode_operations { ... int (*update_time) (..., - struct timespec t, + struct timespec64 t, ...); ... } @ depends on patch @ identifier t; identifier fn_update_time =~ "update_time$"; @@ fn_update_time (..., - struct timespec *t, + struct timespec64 *t, ...) { ... } @ depends on patch @ identifier t; @@ lease_get_mtime( ... , - struct timespec *t + struct timespec64 *t ) { ... } @te depends on patch forall@ identifier ts; local idexpression struct inode *inode_node; identifier i_xtime =~ "^i_[acm]time$"; identifier ia_xtime =~ "^ia_[acm]time$"; identifier fn_update_time =~ "update_time$"; identifier fn; expression e, E3; local idexpression struct inode *node1; local idexpression struct inode *node2; local idexpression struct iattr *attr1; local idexpression struct iattr *attr2; local idexpression struct iattr attr; identifier i_xtime1 =~ "^i_[acm]time$"; identifier i_xtime2 =~ "^i_[acm]time$"; identifier ia_xtime1 =~ "^ia_[acm]time$"; identifier ia_xtime2 =~ "^ia_[acm]time$"; @@ ( ( - struct timespec ts; + struct timespec64 ts; | - struct timespec ts = current_time(inode_node); + struct timespec64 ts = current_time(inode_node); ) <+... when != ts ( - timespec_equal(&inode_node->i_xtime, &ts) + timespec64_equal(&inode_node->i_xtime, &ts) | - timespec_equal(&ts, &inode_node->i_xtime) + timespec64_equal(&ts, &inode_node->i_xtime) | - timespec_compare(&inode_node->i_xtime, &ts) + timespec64_compare(&inode_node->i_xtime, &ts) | - timespec_compare(&ts, &inode_node->i_xtime) + timespec64_compare(&ts, &inode_node->i_xtime) | ts = current_time(e) | fn_update_time(..., &ts,...) | inode_node->i_xtime = ts | node1->i_xtime = ts | ts = inode_node->i_xtime | <+... attr1->ia_xtime ...+> = ts | ts = attr1->ia_xtime | ts.tv_sec | ts.tv_nsec | btrfs_set_stack_timespec_sec(..., ts.tv_sec) | btrfs_set_stack_timespec_nsec(..., ts.tv_nsec) | - ts = timespec64_to_timespec( + ts = ... -) | - ts = ktime_to_timespec( + ts = ktime_to_timespec64( ...) | - ts = E3 + ts = timespec_to_timespec64(E3) | - ktime_get_real_ts(&ts) + ktime_get_real_ts64(&ts) | fn(..., - ts + timespec64_to_timespec(ts) ,...) ) ...+> ( <... when != ts - return ts; + return timespec64_to_timespec(ts); ...> ) | - timespec_equal(&node1->i_xtime1, &node2->i_xtime2) + timespec64_equal(&node1->i_xtime2, &node2->i_xtime2) | - timespec_equal(&node1->i_xtime1, &attr2->ia_xtime2) + timespec64_equal(&node1->i_xtime2, &attr2->ia_xtime2) | - timespec_compare(&node1->i_xtime1, &node2->i_xtime2) + timespec64_compare(&node1->i_xtime1, &node2->i_xtime2) | node1->i_xtime1 = - timespec_trunc(attr1->ia_xtime1, + timespec64_trunc(attr1->ia_xtime1, ...) | - attr1->ia_xtime1 = timespec_trunc(attr2->ia_xtime2, + attr1->ia_xtime1 = timespec64_trunc(attr2->ia_xtime2, ...) | - ktime_get_real_ts(&attr1->ia_xtime1) + ktime_get_real_ts64(&attr1->ia_xtime1) | - ktime_get_real_ts(&attr.ia_xtime1) + ktime_get_real_ts64(&attr.ia_xtime1) ) @ depends on patch @ struct inode *node; struct iattr *attr; identifier fn; identifier i_xtime =~ "^i_[acm]time$"; identifier ia_xtime =~ "^ia_[acm]time$"; expression e; @@ ( - fn(node->i_xtime); + fn(timespec64_to_timespec(node->i_xtime)); | fn(..., - node->i_xtime); + timespec64_to_timespec(node->i_xtime)); | - e = fn(attr->ia_xtime); + e = fn(timespec64_to_timespec(attr->ia_xtime)); ) @ depends on patch forall @ struct inode *node; struct iattr *attr; identifier i_xtime =~ "^i_[acm]time$"; identifier ia_xtime =~ "^ia_[acm]time$"; identifier fn; @@ { + struct timespec ts; <+... ( + ts = timespec64_to_timespec(node->i_xtime); fn (..., - &node->i_xtime, + &ts, ...); | + ts = timespec64_to_timespec(attr->ia_xtime); fn (..., - &attr->ia_xtime, + &ts, ...); ) ...+> } @ depends on patch forall @ struct inode *node; struct iattr *attr; struct kstat *stat; identifier ia_xtime =~ "^ia_[acm]time$"; identifier i_xtime =~ "^i_[acm]time$"; identifier xtime =~ "^[acm]time$"; identifier fn, ret; @@ { + struct timespec ts; <+... ( + ts = timespec64_to_timespec(node->i_xtime); ret = fn (..., - &node->i_xtime, + &ts, ...); | + ts = timespec64_to_timespec(node->i_xtime); ret = fn (..., - &node->i_xtime); + &ts); | + ts = timespec64_to_timespec(attr->ia_xtime); ret = fn (..., - &attr->ia_xtime, + &ts, ...); | + ts = timespec64_to_timespec(attr->ia_xtime); ret = fn (..., - &attr->ia_xtime); + &ts); | + ts = timespec64_to_timespec(stat->xtime); ret = fn (..., - &stat->xtime); + &ts); ) ...+> } @ depends on patch @ struct inode *node; struct inode *node2; identifier i_xtime1 =~ "^i_[acm]time$"; identifier i_xtime2 =~ "^i_[acm]time$"; identifier i_xtime3 =~ "^i_[acm]time$"; struct iattr *attrp; struct iattr *attrp2; struct iattr attr ; identifier ia_xtime1 =~ "^ia_[acm]time$"; identifier ia_xtime2 =~ "^ia_[acm]time$"; struct kstat *stat; struct kstat stat1; struct timespec64 ts; identifier xtime =~ "^[acmb]time$"; expression e; @@ ( ( node->i_xtime2 \| attrp->ia_xtime2 \| attr.ia_xtime2 \) = node->i_xtime1 ; | node->i_xtime2 = \( node2->i_xtime1 \| timespec64_trunc(...) \); | node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \); | node->i_xtime1 = node->i_xtime3 = \(ts \| current_time(...) \); | stat->xtime = node2->i_xtime1; | stat1.xtime = node2->i_xtime1; | ( node->i_xtime2 \| attrp->ia_xtime2 \) = attrp->ia_xtime1 ; | ( attrp->ia_xtime1 \| attr.ia_xtime1 \) = attrp2->ia_xtime2; | - e = node->i_xtime1; + e = timespec64_to_timespec( node->i_xtime1 ); | - e = attrp->ia_xtime1; + e = timespec64_to_timespec( attrp->ia_xtime1 ); | node->i_xtime1 = current_time(...); | node->i_xtime2 = node->i_xtime1 = node->i_xtime3 = - e; + timespec_to_timespec64(e); | node->i_xtime1 = node->i_xtime3 = - e; + timespec_to_timespec64(e); | - node->i_xtime1 = e; + node->i_xtime1 = timespec_to_timespec64(e); ) Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Cc: <anton@tuxera.com> Cc: <balbi@kernel.org> Cc: <bfields@fieldses.org> Cc: <darrick.wong@oracle.com> Cc: <dhowells@redhat.com> Cc: <dsterba@suse.com> Cc: <dwmw2@infradead.org> Cc: <hch@lst.de> Cc: <hirofumi@mail.parknet.co.jp> Cc: <hubcap@omnibond.com> Cc: <jack@suse.com> Cc: <jaegeuk@kernel.org> Cc: <jaharkes@cs.cmu.edu> Cc: <jslaby@suse.com> Cc: <keescook@chromium.org> Cc: <mark@fasheh.com> Cc: <miklos@szeredi.hu> Cc: <nico@linaro.org> Cc: <reiserfs-devel@vger.kernel.org> Cc: <richard@nod.at> Cc: <sage@redhat.com> Cc: <sfrench@samba.org> Cc: <swhiteho@redhat.com> Cc: <tj@kernel.org> Cc: <trond.myklebust@primarydata.com> Cc: <tytso@mit.edu> Cc: <viro@zeniv.linux.org.uk>
514 lines
12 KiB
C
514 lines
12 KiB
C
/*
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* Persistent Storage - ramfs parts.
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*
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* Copyright (C) 2010 Intel Corporation <tony.luck@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/fsnotify.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/time.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/string.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/ramfs.h>
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#include <linux/parser.h>
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#include <linux/sched.h>
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#include <linux/magic.h>
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#include <linux/pstore.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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#define PSTORE_NAMELEN 64
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static DEFINE_SPINLOCK(allpstore_lock);
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static LIST_HEAD(allpstore);
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struct pstore_private {
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struct list_head list;
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struct pstore_record *record;
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size_t total_size;
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};
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struct pstore_ftrace_seq_data {
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const void *ptr;
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size_t off;
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size_t size;
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};
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#define REC_SIZE sizeof(struct pstore_ftrace_record)
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static void free_pstore_private(struct pstore_private *private)
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{
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if (!private)
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return;
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if (private->record) {
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kfree(private->record->buf);
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kfree(private->record);
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}
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kfree(private);
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}
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static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
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{
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struct pstore_private *ps = s->private;
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struct pstore_ftrace_seq_data *data;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return NULL;
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data->off = ps->total_size % REC_SIZE;
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data->off += *pos * REC_SIZE;
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if (data->off + REC_SIZE > ps->total_size) {
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kfree(data);
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return NULL;
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}
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return data;
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}
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static void pstore_ftrace_seq_stop(struct seq_file *s, void *v)
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{
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kfree(v);
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}
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static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
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{
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struct pstore_private *ps = s->private;
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struct pstore_ftrace_seq_data *data = v;
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data->off += REC_SIZE;
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if (data->off + REC_SIZE > ps->total_size)
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return NULL;
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(*pos)++;
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return data;
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}
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static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
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{
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struct pstore_private *ps = s->private;
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struct pstore_ftrace_seq_data *data = v;
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struct pstore_ftrace_record *rec;
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rec = (struct pstore_ftrace_record *)(ps->record->buf + data->off);
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seq_printf(s, "CPU:%d ts:%llu %08lx %08lx %pf <- %pF\n",
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pstore_ftrace_decode_cpu(rec),
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pstore_ftrace_read_timestamp(rec),
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rec->ip, rec->parent_ip, (void *)rec->ip,
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(void *)rec->parent_ip);
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return 0;
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}
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static const struct seq_operations pstore_ftrace_seq_ops = {
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.start = pstore_ftrace_seq_start,
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.next = pstore_ftrace_seq_next,
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.stop = pstore_ftrace_seq_stop,
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.show = pstore_ftrace_seq_show,
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};
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static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct seq_file *sf = file->private_data;
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struct pstore_private *ps = sf->private;
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if (ps->record->type == PSTORE_TYPE_FTRACE)
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return seq_read(file, userbuf, count, ppos);
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return simple_read_from_buffer(userbuf, count, ppos,
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ps->record->buf, ps->total_size);
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}
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static int pstore_file_open(struct inode *inode, struct file *file)
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{
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struct pstore_private *ps = inode->i_private;
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struct seq_file *sf;
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int err;
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const struct seq_operations *sops = NULL;
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if (ps->record->type == PSTORE_TYPE_FTRACE)
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sops = &pstore_ftrace_seq_ops;
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err = seq_open(file, sops);
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if (err < 0)
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return err;
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sf = file->private_data;
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sf->private = ps;
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return 0;
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}
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static loff_t pstore_file_llseek(struct file *file, loff_t off, int whence)
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{
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struct seq_file *sf = file->private_data;
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if (sf->op)
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return seq_lseek(file, off, whence);
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return default_llseek(file, off, whence);
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}
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static const struct file_operations pstore_file_operations = {
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.open = pstore_file_open,
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.read = pstore_file_read,
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.llseek = pstore_file_llseek,
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.release = seq_release,
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};
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/*
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* When a file is unlinked from our file system we call the
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* platform driver to erase the record from persistent store.
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*/
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static int pstore_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct pstore_private *p = d_inode(dentry)->i_private;
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struct pstore_record *record = p->record;
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if (!record->psi->erase)
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return -EPERM;
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mutex_lock(&record->psi->read_mutex);
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record->psi->erase(record);
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mutex_unlock(&record->psi->read_mutex);
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return simple_unlink(dir, dentry);
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}
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static void pstore_evict_inode(struct inode *inode)
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{
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struct pstore_private *p = inode->i_private;
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unsigned long flags;
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clear_inode(inode);
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if (p) {
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spin_lock_irqsave(&allpstore_lock, flags);
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list_del(&p->list);
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spin_unlock_irqrestore(&allpstore_lock, flags);
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free_pstore_private(p);
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}
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}
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static const struct inode_operations pstore_dir_inode_operations = {
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.lookup = simple_lookup,
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.unlink = pstore_unlink,
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};
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static struct inode *pstore_get_inode(struct super_block *sb)
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{
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struct inode *inode = new_inode(sb);
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if (inode) {
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inode->i_ino = get_next_ino();
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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}
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return inode;
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}
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enum {
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Opt_kmsg_bytes, Opt_err
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};
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static const match_table_t tokens = {
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{Opt_kmsg_bytes, "kmsg_bytes=%u"},
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{Opt_err, NULL}
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};
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static void parse_options(char *options)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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if (!options)
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return;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_kmsg_bytes:
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if (!match_int(&args[0], &option))
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pstore_set_kmsg_bytes(option);
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break;
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}
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}
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}
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/*
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* Display the mount options in /proc/mounts.
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*/
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static int pstore_show_options(struct seq_file *m, struct dentry *root)
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{
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if (kmsg_bytes != PSTORE_DEFAULT_KMSG_BYTES)
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seq_printf(m, ",kmsg_bytes=%lu", kmsg_bytes);
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return 0;
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}
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static int pstore_remount(struct super_block *sb, int *flags, char *data)
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{
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sync_filesystem(sb);
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parse_options(data);
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return 0;
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}
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static const struct super_operations pstore_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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.evict_inode = pstore_evict_inode,
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.remount_fs = pstore_remount,
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.show_options = pstore_show_options,
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};
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static struct super_block *pstore_sb;
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bool pstore_is_mounted(void)
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{
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return pstore_sb != NULL;
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}
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/*
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* Make a regular file in the root directory of our file system.
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* Load it up with "size" bytes of data from "buf".
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* Set the mtime & ctime to the date that this record was originally stored.
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*/
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int pstore_mkfile(struct dentry *root, struct pstore_record *record)
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{
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struct dentry *dentry;
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struct inode *inode;
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int rc = 0;
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char name[PSTORE_NAMELEN];
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struct pstore_private *private, *pos;
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unsigned long flags;
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size_t size = record->size + record->ecc_notice_size;
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WARN_ON(!inode_is_locked(d_inode(root)));
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spin_lock_irqsave(&allpstore_lock, flags);
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list_for_each_entry(pos, &allpstore, list) {
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if (pos->record->type == record->type &&
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pos->record->id == record->id &&
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pos->record->psi == record->psi) {
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rc = -EEXIST;
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break;
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}
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}
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spin_unlock_irqrestore(&allpstore_lock, flags);
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if (rc)
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return rc;
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rc = -ENOMEM;
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inode = pstore_get_inode(root->d_sb);
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if (!inode)
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goto fail;
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inode->i_mode = S_IFREG | 0444;
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inode->i_fop = &pstore_file_operations;
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private = kzalloc(sizeof(*private), GFP_KERNEL);
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if (!private)
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goto fail_alloc;
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private->record = record;
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switch (record->type) {
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case PSTORE_TYPE_DMESG:
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scnprintf(name, sizeof(name), "dmesg-%s-%llu%s",
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record->psi->name, record->id,
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record->compressed ? ".enc.z" : "");
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break;
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case PSTORE_TYPE_CONSOLE:
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scnprintf(name, sizeof(name), "console-%s-%llu",
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record->psi->name, record->id);
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break;
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case PSTORE_TYPE_FTRACE:
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scnprintf(name, sizeof(name), "ftrace-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_MCE:
|
|
scnprintf(name, sizeof(name), "mce-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_PPC_RTAS:
|
|
scnprintf(name, sizeof(name), "rtas-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_PPC_OF:
|
|
scnprintf(name, sizeof(name), "powerpc-ofw-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_PPC_COMMON:
|
|
scnprintf(name, sizeof(name), "powerpc-common-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_PMSG:
|
|
scnprintf(name, sizeof(name), "pmsg-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_PPC_OPAL:
|
|
scnprintf(name, sizeof(name), "powerpc-opal-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
case PSTORE_TYPE_UNKNOWN:
|
|
scnprintf(name, sizeof(name), "unknown-%s-%llu",
|
|
record->psi->name, record->id);
|
|
break;
|
|
default:
|
|
scnprintf(name, sizeof(name), "type%d-%s-%llu",
|
|
record->type, record->psi->name, record->id);
|
|
break;
|
|
}
|
|
|
|
dentry = d_alloc_name(root, name);
|
|
if (!dentry)
|
|
goto fail_private;
|
|
|
|
inode->i_size = private->total_size = size;
|
|
|
|
inode->i_private = private;
|
|
|
|
if (record->time.tv_sec)
|
|
inode->i_mtime = inode->i_ctime = record->time;
|
|
|
|
d_add(dentry, inode);
|
|
|
|
spin_lock_irqsave(&allpstore_lock, flags);
|
|
list_add(&private->list, &allpstore);
|
|
spin_unlock_irqrestore(&allpstore_lock, flags);
|
|
|
|
return 0;
|
|
|
|
fail_private:
|
|
free_pstore_private(private);
|
|
fail_alloc:
|
|
iput(inode);
|
|
|
|
fail:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Read all the records from the persistent store. Create
|
|
* files in our filesystem. Don't warn about -EEXIST errors
|
|
* when we are re-scanning the backing store looking to add new
|
|
* error records.
|
|
*/
|
|
void pstore_get_records(int quiet)
|
|
{
|
|
struct pstore_info *psi = psinfo;
|
|
struct dentry *root;
|
|
|
|
if (!psi || !pstore_sb)
|
|
return;
|
|
|
|
root = pstore_sb->s_root;
|
|
|
|
inode_lock(d_inode(root));
|
|
pstore_get_backend_records(psi, root, quiet);
|
|
inode_unlock(d_inode(root));
|
|
}
|
|
|
|
static int pstore_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *inode;
|
|
|
|
pstore_sb = sb;
|
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
|
sb->s_magic = PSTOREFS_MAGIC;
|
|
sb->s_op = &pstore_ops;
|
|
sb->s_time_gran = 1;
|
|
|
|
parse_options(data);
|
|
|
|
inode = pstore_get_inode(sb);
|
|
if (inode) {
|
|
inode->i_mode = S_IFDIR | 0750;
|
|
inode->i_op = &pstore_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
inc_nlink(inode);
|
|
}
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root)
|
|
return -ENOMEM;
|
|
|
|
pstore_get_records(0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *pstore_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_single(fs_type, flags, data, pstore_fill_super);
|
|
}
|
|
|
|
static void pstore_kill_sb(struct super_block *sb)
|
|
{
|
|
kill_litter_super(sb);
|
|
pstore_sb = NULL;
|
|
}
|
|
|
|
static struct file_system_type pstore_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "pstore",
|
|
.mount = pstore_mount,
|
|
.kill_sb = pstore_kill_sb,
|
|
};
|
|
|
|
static int __init init_pstore_fs(void)
|
|
{
|
|
int err;
|
|
|
|
pstore_choose_compression();
|
|
|
|
/* Create a convenient mount point for people to access pstore */
|
|
err = sysfs_create_mount_point(fs_kobj, "pstore");
|
|
if (err)
|
|
goto out;
|
|
|
|
err = register_filesystem(&pstore_fs_type);
|
|
if (err < 0)
|
|
sysfs_remove_mount_point(fs_kobj, "pstore");
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
module_init(init_pstore_fs)
|
|
|
|
static void __exit exit_pstore_fs(void)
|
|
{
|
|
unregister_filesystem(&pstore_fs_type);
|
|
sysfs_remove_mount_point(fs_kobj, "pstore");
|
|
}
|
|
module_exit(exit_pstore_fs)
|
|
|
|
MODULE_AUTHOR("Tony Luck <tony.luck@intel.com>");
|
|
MODULE_LICENSE("GPL");
|