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-rw-r--r--fs/pstore/ftrace.c46
-rw-r--r--fs/pstore/inode.c1
-rw-r--r--fs/pstore/platform.c39
-rw-r--r--fs/pstore/ram_core.c4
-rw-r--r--fs/pstore/zone.c12
5 files changed, 58 insertions, 44 deletions
diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
index 5939595f0115..776cae20af4e 100644
--- a/fs/pstore/ftrace.c
+++ b/fs/pstore/ftrace.c
@@ -64,20 +64,12 @@ static struct ftrace_ops pstore_ftrace_ops __read_mostly = {
static DEFINE_MUTEX(pstore_ftrace_lock);
static bool pstore_ftrace_enabled;
-static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
- size_t count, loff_t *ppos)
+static int pstore_set_ftrace_enabled(bool on)
{
- u8 on;
ssize_t ret;
- ret = kstrtou8_from_user(buf, count, 2, &on);
- if (ret)
- return ret;
-
- mutex_lock(&pstore_ftrace_lock);
-
- if (!on ^ pstore_ftrace_enabled)
- goto out;
+ if (on == pstore_ftrace_enabled)
+ return 0;
if (on) {
ftrace_ops_set_global_filter(&pstore_ftrace_ops);
@@ -89,15 +81,30 @@ static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
if (ret) {
pr_err("%s: unable to %sregister ftrace ops: %zd\n",
__func__, on ? "" : "un", ret);
- goto err;
+ } else {
+ pstore_ftrace_enabled = on;
}
- pstore_ftrace_enabled = on;
-out:
- ret = count;
-err:
+ return ret;
+}
+
+static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ u8 on;
+ ssize_t ret;
+
+ ret = kstrtou8_from_user(buf, count, 2, &on);
+ if (ret)
+ return ret;
+
+ mutex_lock(&pstore_ftrace_lock);
+ ret = pstore_set_ftrace_enabled(on);
mutex_unlock(&pstore_ftrace_lock);
+ if (ret == 0)
+ ret = count;
+
return ret;
}
@@ -117,6 +124,11 @@ static const struct file_operations pstore_knob_fops = {
static struct dentry *pstore_ftrace_dir;
+static bool record_ftrace;
+module_param(record_ftrace, bool, 0400);
+MODULE_PARM_DESC(record_ftrace,
+ "enable ftrace recording immediately (default: off)");
+
void pstore_register_ftrace(void)
{
if (!psinfo->write)
@@ -124,6 +136,8 @@ void pstore_register_ftrace(void)
pstore_ftrace_dir = debugfs_create_dir("pstore", NULL);
+ pstore_set_ftrace_enabled(record_ftrace);
+
debugfs_create_file("record_ftrace", 0600, pstore_ftrace_dir, NULL,
&pstore_knob_fops);
}
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 14658b009f1b..ffbadb8b3032 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -55,6 +55,7 @@ static void free_pstore_private(struct pstore_private *private)
return;
if (private->record) {
kfree(private->record->buf);
+ kfree(private->record->priv);
kfree(private->record);
}
kfree(private);
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index f243cb5e6a4f..0c034ea39954 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -143,21 +143,22 @@ static void pstore_timer_kick(void)
mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
}
-/*
- * Should pstore_dump() wait for a concurrent pstore_dump()? If
- * not, the current pstore_dump() will report a failure to dump
- * and return.
- */
-static bool pstore_cannot_wait(enum kmsg_dump_reason reason)
+static bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
{
- /* In NMI path, pstore shouldn't block regardless of reason. */
+ /*
+ * In case of NMI path, pstore shouldn't be blocked
+ * regardless of reason.
+ */
if (in_nmi())
return true;
switch (reason) {
/* In panic case, other cpus are stopped by smp_send_stop(). */
case KMSG_DUMP_PANIC:
- /* Emergency restart shouldn't be blocked. */
+ /*
+ * Emergency restart shouldn't be blocked by spinning on
+ * pstore_info::buf_lock.
+ */
case KMSG_DUMP_EMERG:
return true;
default:
@@ -389,21 +390,19 @@ static void pstore_dump(struct kmsg_dumper *dumper,
unsigned long total = 0;
const char *why;
unsigned int part = 1;
+ unsigned long flags = 0;
int ret;
why = kmsg_dump_reason_str(reason);
- if (down_trylock(&psinfo->buf_lock)) {
- /* Failed to acquire lock: give up if we cannot wait. */
- if (pstore_cannot_wait(reason)) {
- pr_err("dump skipped in %s path: may corrupt error record\n",
- in_nmi() ? "NMI" : why);
- return;
- }
- if (down_interruptible(&psinfo->buf_lock)) {
- pr_err("could not grab semaphore?!\n");
+ if (pstore_cannot_block_path(reason)) {
+ if (!spin_trylock_irqsave(&psinfo->buf_lock, flags)) {
+ pr_err("dump skipped in %s path because of concurrent dump\n",
+ in_nmi() ? "NMI" : why);
return;
}
+ } else {
+ spin_lock_irqsave(&psinfo->buf_lock, flags);
}
kmsg_dump_rewind(&iter);
@@ -467,8 +466,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
total += record.size;
part++;
}
-
- up(&psinfo->buf_lock);
+ spin_unlock_irqrestore(&psinfo->buf_lock, flags);
}
static struct kmsg_dumper pstore_dumper = {
@@ -594,7 +592,7 @@ int pstore_register(struct pstore_info *psi)
psi->write_user = pstore_write_user_compat;
psinfo = psi;
mutex_init(&psinfo->read_mutex);
- sema_init(&psinfo->buf_lock, 1);
+ spin_lock_init(&psinfo->buf_lock);
if (psi->flags & PSTORE_FLAGS_DMESG)
allocate_buf_for_compression();
@@ -771,6 +769,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
if (rc) {
/* pstore_mkfile() did not take record, so free it. */
kfree(record->buf);
+ kfree(record->priv);
kfree(record);
if (rc != -EEXIST || !quiet)
failed++;
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index fe5305028c6e..a89e33719fcf 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -263,10 +263,10 @@ ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
if (prz->corrected_bytes || prz->bad_blocks)
ret = snprintf(str, len, ""
- "\n%d Corrected bytes, %d unrecoverable blocks\n",
+ "\nECC: %d Corrected bytes, %d unrecoverable blocks\n",
prz->corrected_bytes, prz->bad_blocks);
else
- ret = snprintf(str, len, "\nNo errors detected\n");
+ ret = snprintf(str, len, "\nECC: No errors detected\n");
return ret;
}
diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
index 7c8f8feac6c3..017d0d4ad329 100644
--- a/fs/pstore/zone.c
+++ b/fs/pstore/zone.c
@@ -363,7 +363,7 @@ static int psz_kmsg_recover_data(struct psz_context *cxt)
rcnt = info->read((char *)buf, zone->buffer_size + sizeof(*buf),
zone->off);
if (rcnt != zone->buffer_size + sizeof(*buf))
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
return 0;
}
@@ -372,7 +372,7 @@ static int psz_kmsg_recover_meta(struct psz_context *cxt)
{
struct pstore_zone_info *info = cxt->pstore_zone_info;
struct pstore_zone *zone;
- size_t rcnt, len;
+ ssize_t rcnt, len;
struct psz_buffer *buf;
struct psz_kmsg_header *hdr;
struct timespec64 time = { };
@@ -400,7 +400,7 @@ static int psz_kmsg_recover_meta(struct psz_context *cxt)
continue;
} else if (rcnt != len) {
pr_err("read %s with id %lu failed\n", zone->name, i);
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
if (buf->sig != zone->buffer->sig) {
@@ -502,7 +502,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read((char *)&tmpbuf, len, zone->off);
if (rcnt != len) {
pr_debug("read zone %s failed\n", zone->name);
- return (int)rcnt < 0 ? (int)rcnt : -EIO;
+ return rcnt < 0 ? rcnt : -EIO;
}
if (tmpbuf.sig != zone->buffer->sig) {
@@ -544,7 +544,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read(buf, len - start, off + start);
if (rcnt != len - start) {
pr_err("read zone %s failed\n", zone->name);
- ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
+ ret = rcnt < 0 ? rcnt : -EIO;
goto free_oldbuf;
}
@@ -552,7 +552,7 @@ static int psz_recover_zone(struct psz_context *cxt, struct pstore_zone *zone)
rcnt = info->read(buf + len - start, start, off);
if (rcnt != start) {
pr_err("read zone %s failed\n", zone->name);
- ret = (int)rcnt < 0 ? (int)rcnt : -EIO;
+ ret = rcnt < 0 ? rcnt : -EIO;
goto free_oldbuf;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.