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-rw-r--r--fs/pstore/ftrace.c11
-rw-r--r--fs/pstore/inode.c147
-rw-r--r--fs/pstore/internal.h8
-rw-r--r--fs/pstore/platform.c301
-rw-r--r--fs/pstore/pmsg.c12
-rw-r--r--fs/pstore/ram.c130
-rw-r--r--fs/pstore/ram_core.c2
7 files changed, 350 insertions, 261 deletions
diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c
index 899d0ba0bd6c..06aab07b6bb7 100644
--- a/fs/pstore/ftrace.c
+++ b/fs/pstore/ftrace.c
@@ -37,6 +37,12 @@ static void notrace pstore_ftrace_call(unsigned long ip,
{
unsigned long flags;
struct pstore_ftrace_record rec = {};
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_FTRACE,
+ .buf = (char *)&rec,
+ .size = sizeof(rec),
+ .psi = psinfo,
+ };
if (unlikely(oops_in_progress))
return;
@@ -47,8 +53,7 @@ static void notrace pstore_ftrace_call(unsigned long ip,
rec.parent_ip = parent_ip;
pstore_ftrace_write_timestamp(&rec, pstore_ftrace_stamp++);
pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
- psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec,
- 0, sizeof(rec), psinfo);
+ psinfo->write(&record);
local_irq_restore(flags);
}
@@ -117,7 +122,7 @@ void pstore_register_ftrace(void)
{
struct dentry *file;
- if (!psinfo->write_buf)
+ if (!psinfo->write)
return;
pstore_ftrace_dir = debugfs_create_dir("pstore", NULL);
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 57c0646479f5..792a4e5f9226 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -47,12 +47,8 @@ static LIST_HEAD(allpstore);
struct pstore_private {
struct list_head list;
- struct pstore_info *psi;
- enum pstore_type_id type;
- u64 id;
- int count;
- ssize_t size;
- char data[];
+ struct pstore_record *record;
+ size_t total_size;
};
struct pstore_ftrace_seq_data {
@@ -63,6 +59,17 @@ struct pstore_ftrace_seq_data {
#define REC_SIZE sizeof(struct pstore_ftrace_record)
+static void free_pstore_private(struct pstore_private *private)
+{
+ if (!private)
+ return;
+ if (private->record) {
+ kfree(private->record->buf);
+ kfree(private->record);
+ }
+ kfree(private);
+}
+
static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
{
struct pstore_private *ps = s->private;
@@ -72,9 +79,9 @@ static void *pstore_ftrace_seq_start(struct seq_file *s, loff_t *pos)
if (!data)
return NULL;
- data->off = ps->size % REC_SIZE;
+ data->off = ps->total_size % REC_SIZE;
data->off += *pos * REC_SIZE;
- if (data->off + REC_SIZE > ps->size) {
+ if (data->off + REC_SIZE > ps->total_size) {
kfree(data);
return NULL;
}
@@ -94,7 +101,7 @@ static void *pstore_ftrace_seq_next(struct seq_file *s, void *v, loff_t *pos)
struct pstore_ftrace_seq_data *data = v;
data->off += REC_SIZE;
- if (data->off + REC_SIZE > ps->size)
+ if (data->off + REC_SIZE > ps->total_size)
return NULL;
(*pos)++;
@@ -105,7 +112,9 @@ static int pstore_ftrace_seq_show(struct seq_file *s, void *v)
{
struct pstore_private *ps = s->private;
struct pstore_ftrace_seq_data *data = v;
- struct pstore_ftrace_record *rec = (void *)(ps->data + data->off);
+ struct pstore_ftrace_record *rec;
+
+ rec = (struct pstore_ftrace_record *)(ps->record->buf + data->off);
seq_printf(s, "CPU:%d ts:%llu %08lx %08lx %pf <- %pF\n",
pstore_ftrace_decode_cpu(rec),
@@ -125,7 +134,7 @@ static const struct seq_operations pstore_ftrace_seq_ops = {
static int pstore_check_syslog_permissions(struct pstore_private *ps)
{
- switch (ps->type) {
+ switch (ps->record->type) {
case PSTORE_TYPE_DMESG:
case PSTORE_TYPE_CONSOLE:
return check_syslog_permissions(SYSLOG_ACTION_READ_ALL,
@@ -141,9 +150,10 @@ static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
struct seq_file *sf = file->private_data;
struct pstore_private *ps = sf->private;
- if (ps->type == PSTORE_TYPE_FTRACE)
+ if (ps->record->type == PSTORE_TYPE_FTRACE)
return seq_read(file, userbuf, count, ppos);
- return simple_read_from_buffer(userbuf, count, ppos, ps->data, ps->size);
+ return simple_read_from_buffer(userbuf, count, ppos,
+ ps->record->buf, ps->total_size);
}
static int pstore_file_open(struct inode *inode, struct file *file)
@@ -157,7 +167,7 @@ static int pstore_file_open(struct inode *inode, struct file *file)
if (err)
return err;
- if (ps->type == PSTORE_TYPE_FTRACE)
+ if (ps->record->type == PSTORE_TYPE_FTRACE)
sops = &pstore_ftrace_seq_ops;
err = seq_open(file, sops);
@@ -193,20 +203,19 @@ static const struct file_operations pstore_file_operations = {
static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
struct pstore_private *p = d_inode(dentry)->i_private;
+ struct pstore_record *record = p->record;
int err;
err = pstore_check_syslog_permissions(p);
if (err)
return err;
- if (p->psi->erase) {
- mutex_lock(&p->psi->read_mutex);
- p->psi->erase(p->type, p->id, p->count,
- d_inode(dentry)->i_ctime, p->psi);
- mutex_unlock(&p->psi->read_mutex);
- } else {
+ if (!record->psi->erase)
return -EPERM;
- }
+
+ mutex_lock(&record->psi->read_mutex);
+ record->psi->erase(record);
+ mutex_unlock(&record->psi->read_mutex);
return simple_unlink(dir, dentry);
}
@@ -221,7 +230,7 @@ static void pstore_evict_inode(struct inode *inode)
spin_lock_irqsave(&allpstore_lock, flags);
list_del(&p->list);
spin_unlock_irqrestore(&allpstore_lock, flags);
- kfree(p);
+ free_pstore_private(p);
}
}
@@ -302,23 +311,23 @@ bool pstore_is_mounted(void)
* Load it up with "size" bytes of data from "buf".
* Set the mtime & ctime to the date that this record was originally stored.
*/
-int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
- char *data, bool compressed, size_t size,
- struct timespec time, struct pstore_info *psi)
+int pstore_mkfile(struct dentry *root, struct pstore_record *record)
{
- struct dentry *root = pstore_sb->s_root;
struct dentry *dentry;
struct inode *inode;
int rc = 0;
char name[PSTORE_NAMELEN];
struct pstore_private *private, *pos;
unsigned long flags;
+ size_t size = record->size + record->ecc_notice_size;
+
+ WARN_ON(!inode_is_locked(d_inode(root)));
spin_lock_irqsave(&allpstore_lock, flags);
list_for_each_entry(pos, &allpstore, list) {
- if (pos->type == type &&
- pos->id == id &&
- pos->psi == psi) {
+ if (pos->record->type == record->type &&
+ pos->record->id == record->id &&
+ pos->record->psi == record->psi) {
rc = -EEXIST;
break;
}
@@ -328,72 +337,74 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
return rc;
rc = -ENOMEM;
- inode = pstore_get_inode(pstore_sb);
+ inode = pstore_get_inode(root->d_sb);
if (!inode)
goto fail;
inode->i_mode = S_IFREG | 0444;
inode->i_fop = &pstore_file_operations;
- private = kmalloc(sizeof *private + size, GFP_KERNEL);
+ private = kzalloc(sizeof(*private), GFP_KERNEL);
if (!private)
goto fail_alloc;
- private->type = type;
- private->id = id;
- private->count = count;
- private->psi = psi;
+ private->record = record;
- switch (type) {
+ switch (record->type) {
case PSTORE_TYPE_DMESG:
scnprintf(name, sizeof(name), "dmesg-%s-%lld%s",
- psname, id, compressed ? ".enc.z" : "");
+ record->psi->name, record->id,
+ record->compressed ? ".enc.z" : "");
break;
case PSTORE_TYPE_CONSOLE:
- scnprintf(name, sizeof(name), "console-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "console-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_FTRACE:
- scnprintf(name, sizeof(name), "ftrace-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "ftrace-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_MCE:
- scnprintf(name, sizeof(name), "mce-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "mce-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_RTAS:
- scnprintf(name, sizeof(name), "rtas-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "rtas-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_OF:
scnprintf(name, sizeof(name), "powerpc-ofw-%s-%lld",
- psname, id);
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_COMMON:
scnprintf(name, sizeof(name), "powerpc-common-%s-%lld",
- psname, id);
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_PMSG:
- scnprintf(name, sizeof(name), "pmsg-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "pmsg-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_PPC_OPAL:
- sprintf(name, "powerpc-opal-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "powerpc-opal-%s-%lld",
+ record->psi->name, record->id);
break;
case PSTORE_TYPE_UNKNOWN:
- scnprintf(name, sizeof(name), "unknown-%s-%lld", psname, id);
+ scnprintf(name, sizeof(name), "unknown-%s-%lld",
+ record->psi->name, record->id);
break;
default:
scnprintf(name, sizeof(name), "type%d-%s-%lld",
- type, psname, id);
+ record->type, record->psi->name, record->id);
break;
}
- inode_lock(d_inode(root));
-
dentry = d_alloc_name(root, name);
if (!dentry)
- goto fail_lockedalloc;
+ goto fail_private;
- memcpy(private->data, data, size);
- inode->i_size = private->size = size;
+ inode->i_size = private->total_size = size;
inode->i_private = private;
- if (time.tv_sec)
- inode->i_mtime = inode->i_ctime = time;
+ if (record->time.tv_sec)
+ inode->i_mtime = inode->i_ctime = record->time;
d_add(dentry, inode);
@@ -401,13 +412,10 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
list_add(&private->list, &allpstore);
spin_unlock_irqrestore(&allpstore_lock, flags);
- inode_unlock(d_inode(root));
-
return 0;
-fail_lockedalloc:
- inode_unlock(d_inode(root));
- kfree(private);
+fail_private:
+ free_pstore_private(private);
fail_alloc:
iput(inode);
@@ -415,6 +423,27 @@ 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;
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index da416e6591c9..c416e653dc4f 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -25,10 +25,10 @@ extern struct pstore_info *psinfo;
extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(int);
-extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
- int count, char *data, bool compressed,
- size_t size, struct timespec time,
- struct pstore_info *psi);
+extern void pstore_get_backend_records(struct pstore_info *psi,
+ struct dentry *root, int quiet);
+extern int pstore_mkfile(struct dentry *root,
+ struct pstore_record *record);
extern bool pstore_is_mounted(void);
#endif
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index efab7b64925b..d468eec9b8a6 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -267,7 +267,7 @@ static void free_zlib(void)
big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_zlib = {
+static const struct pstore_zbackend backend_zlib = {
.compress = compress_zlib,
.decompress = decompress_zlib,
.allocate = allocate_zlib,
@@ -328,7 +328,7 @@ static void free_lzo(void)
big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_lzo = {
+static const struct pstore_zbackend backend_lzo = {
.compress = compress_lzo,
.decompress = decompress_lzo,
.allocate = allocate_lzo,
@@ -393,7 +393,7 @@ static void free_lz4(void)
big_oops_buf_sz = 0;
}
-static struct pstore_zbackend backend_lz4 = {
+static const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
.decompress = decompress_lz4,
.allocate = allocate_lz4,
@@ -402,7 +402,7 @@ static struct pstore_zbackend backend_lz4 = {
};
#endif
-static struct pstore_zbackend *zbackend =
+static const struct pstore_zbackend *zbackend =
#if defined(CONFIG_PSTORE_ZLIB_COMPRESS)
&backend_zlib;
#elif defined(CONFIG_PSTORE_LZO_COMPRESS)
@@ -484,7 +484,6 @@ static void pstore_dump(struct kmsg_dumper *dumper,
{
unsigned long total = 0;
const char *why;
- u64 id;
unsigned int part = 1;
unsigned long flags = 0;
int is_locked;
@@ -506,48 +505,59 @@ static void pstore_dump(struct kmsg_dumper *dumper,
oopscount++;
while (total < kmsg_bytes) {
char *dst;
- unsigned long size;
- int hsize;
+ size_t dst_size;
+ int header_size;
int zipped_len = -1;
- size_t len;
- bool compressed = false;
- size_t total_len;
+ size_t dump_size;
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_DMESG,
+ .count = oopscount,
+ .reason = reason,
+ .part = part,
+ .compressed = false,
+ .buf = psinfo->buf,
+ .psi = psinfo,
+ };
if (big_oops_buf && is_locked) {
dst = big_oops_buf;
- size = big_oops_buf_sz;
+ dst_size = big_oops_buf_sz;
} else {
dst = psinfo->buf;
- size = psinfo->bufsize;
+ dst_size = psinfo->bufsize;
}
- hsize = sprintf(dst, "%s#%d Part%u\n", why, oopscount, part);
- size -= hsize;
+ /* Write dump header. */
+ header_size = snprintf(dst, dst_size, "%s#%d Part%u\n", why,
+ oopscount, part);
+ dst_size -= header_size;
- if (!kmsg_dump_get_buffer(dumper, true, dst + hsize,
- size, &len))
+ /* Write dump contents. */
+ if (!kmsg_dump_get_buffer(dumper, true, dst + header_size,
+ dst_size, &dump_size))
break;
if (big_oops_buf && is_locked) {
zipped_len = pstore_compress(dst, psinfo->buf,
- hsize + len, psinfo->bufsize);
+ header_size + dump_size,
+ psinfo->bufsize);
if (zipped_len > 0) {
- compressed = true;
- total_len = zipped_len;
+ record.compressed = true;
+ record.size = zipped_len;
} else {
- total_len = copy_kmsg_to_buffer(hsize, len);
+ record.size = copy_kmsg_to_buffer(header_size,
+ dump_size);
}
} else {
- total_len = hsize + len;
+ record.size = header_size + dump_size;
}
- ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
- oopscount, compressed, total_len, psinfo);
+ ret = psinfo->write(&record);
if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_new_entry = 1;
- total += total_len;
+ total += record.size;
part++;
}
if (is_locked)
@@ -577,8 +587,11 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
const char *e = s + c;
while (s < e) {
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_CONSOLE,
+ .psi = psinfo,
+ };
unsigned long flags;
- u64 id;
if (c > psinfo->bufsize)
c = psinfo->bufsize;
@@ -589,8 +602,9 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
} else {
spin_lock_irqsave(&psinfo->buf_lock, flags);
}
- psinfo->write_buf(PSTORE_TYPE_CONSOLE, 0, &id, 0,
- s, 0, c, psinfo);
+ record.buf = (char *)s;
+ record.size = c;
+ psinfo->write(&record);
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
s += c;
c = e - s;
@@ -618,48 +632,30 @@ static void pstore_register_console(void) {}
static void pstore_unregister_console(void) {}
#endif
-static int pstore_write_compat(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part, int count,
- bool compressed, size_t size,
- struct pstore_info *psi)
-{
- return psi->write_buf(type, reason, id, part, psinfo->buf, compressed,
- size, psi);
-}
-
-static int pstore_write_buf_user_compat(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char __user *buf,
- bool compressed, size_t size,
- struct pstore_info *psi)
-{
- unsigned long flags = 0;
- size_t i, bufsize = size;
- long ret = 0;
-
- if (unlikely(!access_ok(VERIFY_READ, buf, size)))
- return -EFAULT;
- if (bufsize > psinfo->bufsize)
- bufsize = psinfo->bufsize;
- spin_lock_irqsave(&psinfo->buf_lock, flags);
- for (i = 0; i < size; ) {
- size_t c = min(size - i, bufsize);
-
- ret = __copy_from_user(psinfo->buf, buf + i, c);
- if (unlikely(ret != 0)) {
- ret = -EFAULT;
- break;
- }
- ret = psi->write_buf(type, reason, id, part, psinfo->buf,
- compressed, c, psi);
- if (unlikely(ret < 0))
- break;
- i += c;
+static int pstore_write_user_compat(struct pstore_record *record,
+ const char __user *buf)
+{
+ int ret = 0;
+
+ if (record->buf)
+ return -EINVAL;
+
+ record->buf = kmalloc(record->size, GFP_KERNEL);
+ if (!record->buf)
+ return -ENOMEM;
+
+ if (unlikely(copy_from_user(record->buf, buf, record->size))) {
+ ret = -EFAULT;
+ goto out;
}
- spin_unlock_irqrestore(&psinfo->buf_lock, flags);
- return unlikely(ret < 0) ? ret : size;
+
+ ret = record->psi->write(record);
+
+out:
+ kfree(record->buf);
+ record->buf = NULL;
+
+ return unlikely(ret < 0) ? ret : record->size;
}
/*
@@ -673,19 +669,35 @@ int pstore_register(struct pstore_info *psi)
{
struct module *owner = psi->owner;
- if (backend && strcmp(backend, psi->name))
+ if (backend && strcmp(backend, psi->name)) {
+ pr_warn("ignoring unexpected backend '%s'\n", psi->name);
return -EPERM;
+ }
+
+ /* Sanity check flags. */
+ if (!psi->flags) {
+ pr_warn("backend '%s' must support at least one frontend\n",
+ psi->name);
+ return -EINVAL;
+ }
+
+ /* Check for required functions. */
+ if (!psi->read || !psi->write) {
+ pr_warn("backend '%s' must implement read() and write()\n",
+ psi->name);
+ return -EINVAL;
+ }
spin_lock(&pstore_lock);
if (psinfo) {
+ pr_warn("backend '%s' already loaded: ignoring '%s'\n",
+ psinfo->name, psi->name);
spin_unlock(&pstore_lock);
return -EBUSY;
}
- if (!psi->write)
- psi->write = pstore_write_compat;
- if (!psi->write_buf_user)
- psi->write_buf_user = pstore_write_buf_user_compat;
+ if (!psi->write_user)
+ psi->write_user = pstore_write_user_compat;
psinfo = psi;
mutex_init(&psinfo->read_mutex);
spin_unlock(&pstore_lock);
@@ -709,6 +721,7 @@ int pstore_register(struct pstore_info *psi)
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_register_pmsg();
+ /* Start watching for new records, if desired. */
if (pstore_update_ms >= 0) {
pstore_timer.expires = jiffies +
msecs_to_jiffies(pstore_update_ms);
@@ -721,16 +734,21 @@ int pstore_register(struct pstore_info *psi)
*/
backend = psi->name;
- module_put(owner);
-
pr_info("Registered %s as persistent store backend\n", psi->name);
+ module_put(owner);
+
return 0;
}
EXPORT_SYMBOL_GPL(pstore_register);
void pstore_unregister(struct pstore_info *psi)
{
+ /* Stop timer and make sure all work has finished. */
+ pstore_update_ms = -1;
+ del_timer_sync(&pstore_timer);
+ flush_work(&pstore_work);
+
if (psi->flags & PSTORE_FLAGS_PMSG)
pstore_unregister_pmsg();
if (psi->flags & PSTORE_FLAGS_FTRACE)
@@ -747,66 +765,99 @@ void pstore_unregister(struct pstore_info *psi)
}
EXPORT_SYMBOL_GPL(pstore_unregister);
+static void decompress_record(struct pstore_record *record)
+{
+ int unzipped_len;
+ char *decompressed;
+
+ /* Only PSTORE_TYPE_DMESG support compression. */
+ if (!record->compressed || record->type != PSTORE_TYPE_DMESG) {
+ pr_warn("ignored compressed record type %d\n", record->type);
+ return;
+ }
+
+ /* No compression method has created the common buffer. */
+ if (!big_oops_buf) {
+ pr_warn("no decompression buffer allocated\n");
+ return;
+ }
+
+ unzipped_len = pstore_decompress(record->buf, big_oops_buf,
+ record->size, big_oops_buf_sz);
+ if (unzipped_len <= 0) {
+ pr_err("decompression failed: %d\n", unzipped_len);
+ return;
+ }
+
+ /* Build new buffer for decompressed contents. */
+ decompressed = kmalloc(unzipped_len + record->ecc_notice_size,
+ GFP_KERNEL);
+ if (!decompressed) {
+ pr_err("decompression ran out of memory\n");
+ return;
+ }
+ memcpy(decompressed, big_oops_buf, unzipped_len);
+
+ /* Append ECC notice to decompressed buffer. */
+ memcpy(decompressed + unzipped_len, record->buf + record->size,
+ record->ecc_notice_size);
+
+ /* Swap out compresed contents with decompressed contents. */
+ kfree(record->buf);
+ record->buf = decompressed;
+ record->size = unzipped_len;
+ record->compressed = false;
+}
+
/*
- * Read all the records from the persistent store. Create
+ * Read all the records from one persistent store backend. 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;
- char *buf = NULL;
- ssize_t size;
- u64 id;
- int count;
- enum pstore_type_id type;
- struct timespec time;
- int failed = 0, rc;
- bool compressed;
- int unzipped_len = -1;
- ssize_t ecc_notice_size = 0;
-
- if (!psi)
+void pstore_get_backend_records(struct pstore_info *psi,
+ struct dentry *root, int quiet)
+{
+ int failed = 0;
+
+ if (!psi || !root)
return;
mutex_lock(&psi->read_mutex);
if (psi->open && psi->open(psi))
goto out;
- while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,
- &ecc_notice_size, psi)) > 0) {
- if (compressed && (type == PSTORE_TYPE_DMESG)) {
- if (big_oops_buf)
- unzipped_len = pstore_decompress(buf,
- big_oops_buf, size,
- big_oops_buf_sz);
-
- if (unzipped_len > 0) {
- if (ecc_notice_size)
- memcpy(big_oops_buf + unzipped_len,
- buf + size, ecc_notice_size);
- kfree(buf);
- buf = big_oops_buf;
- size = unzipped_len;
- compressed = false;
- } else {
- pr_err("decompression failed;returned %d\n",
- unzipped_len);
- compressed = true;
- }
+ /*
+ * Backend callback read() allocates record.buf. decompress_record()
+ * may reallocate record.buf. On success, pstore_mkfile() will keep
+ * the record.buf, so free it only on failure.
+ */
+ for (;;) {
+ struct pstore_record *record;
+ int rc;
+
+ record = kzalloc(sizeof(*record), GFP_KERNEL);
+ if (!record) {
+ pr_err("out of memory creating record\n");
+ break;
+ }
+ record->psi = psi;
+
+ record->size = psi->read(record);
+
+ /* No more records left in backend? */
+ if (record->size <= 0)
+ break;
+
+ decompress_record(record);
+ rc = pstore_mkfile(root, record);
+ if (rc) {
+ /* pstore_mkfile() did not take record, so free it. */
+ kfree(record->buf);
+ kfree(record);
+ if (rc != -EEXIST || !quiet)
+ failed++;
}
- rc = pstore_mkfile(type, psi->name, id, count, buf,
- compressed, size + ecc_notice_size,
- time, psi);
- if (unzipped_len < 0) {
- /* Free buffer other than big oops */
- kfree(buf);
- buf = NULL;
- } else
- unzipped_len = -1;
- if (rc && (rc != -EEXIST || !quiet))
- failed++;
}
if (psi->close)
psi->close(psi);
@@ -830,7 +881,9 @@ static void pstore_timefunc(unsigned long dummy)
schedule_work(&pstore_work);
}
- mod_timer(&pstore_timer, jiffies + msecs_to_jiffies(pstore_update_ms));
+ if (pstore_update_ms >= 0)
+ mod_timer(&pstore_timer,
+ jiffies + msecs_to_jiffies(pstore_update_ms));
}
module_param(backend, charp, 0444);
diff --git a/fs/pstore/pmsg.c b/fs/pstore/pmsg.c
index 78f6176c020f..209755e0d7c8 100644
--- a/fs/pstore/pmsg.c
+++ b/fs/pstore/pmsg.c
@@ -15,7 +15,6 @@
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
-#include <linux/vmalloc.h>
#include "internal.h"
static DEFINE_MUTEX(pmsg_lock);
@@ -23,19 +22,22 @@ static DEFINE_MUTEX(pmsg_lock);
static ssize_t write_pmsg(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- u64 id;
+ struct pstore_record record = {
+ .type = PSTORE_TYPE_PMSG,
+ .size = count,
+ .psi = psinfo,
+ };
int ret;
if (!count)
return 0;
- /* check outside lock, page in any data. write_buf_user also checks */
+ /* check outside lock, page in any data. write_user also checks */
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
mutex_lock(&pmsg_lock);
- ret = psinfo->write_buf_user(PSTORE_TYPE_PMSG, 0, &id, 0, buf, 0, count,
- psinfo);
+ ret = psinfo->write_user(&record, buf);
mutex_unlock(&pmsg_lock);
return ret ? ret : count;
}
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 11f918d34b1e..5523df7f17ef 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -235,35 +235,34 @@ static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
return 0;
}
-static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
- int *count, struct timespec *time,
- char **buf, bool *compressed,
- ssize_t *ecc_notice_size,
- struct pstore_info *psi)
+static ssize_t ramoops_pstore_read(struct pstore_record *record)
{
ssize_t size = 0;
- struct ramoops_context *cxt = psi->data;
+ struct ramoops_context *cxt = record->psi->data;
struct persistent_ram_zone *prz = NULL;
int header_length = 0;
bool free_prz = false;
- /* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
+ /*
+ * Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
* valid time stamps, so it is initialized to zero.
*/
- time->tv_sec = 0;
- time->tv_nsec = 0;
- *compressed = false;
+ record->time.tv_sec = 0;
+ record->time.tv_nsec = 0;
+ record->compressed = false;
/* Find the next valid persistent_ram_zone for DMESG */
while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
- cxt->max_dump_cnt, id, type,
+ cxt->max_dump_cnt, &record->id,
+ &record->type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
continue;
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
- time, compressed);
+ &record->time,
+ &record->compressed);
/* Clear and skip this DMESG record if it has no valid header */
if (!header_length) {
persistent_ram_free_old(prz);
@@ -274,18 +273,20 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
- 1, id, type, PSTORE_TYPE_CONSOLE, 0);
+ 1, &record->id, &record->type,
+ PSTORE_TYPE_CONSOLE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
- 1, id, type, PSTORE_TYPE_PMSG, 0);
+ 1, &record->id, &record->type,
+ PSTORE_TYPE_PMSG, 0);
/* ftrace is last since it may want to dynamically allocate memory. */
if (!prz_ok(prz)) {
if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
prz = ramoops_get_next_prz(cxt->fprzs,
- &cxt->ftrace_read_cnt, 1, id, type,
- PSTORE_TYPE_FTRACE, 0);
+ &cxt->ftrace_read_cnt, 1, &record->id,
+ &record->type, PSTORE_TYPE_FTRACE, 0);
} else {
/*
* Build a new dummy record which combines all the
@@ -302,8 +303,10 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
prz_next = ramoops_get_next_prz(cxt->fprzs,
&cxt->ftrace_read_cnt,
- cxt->max_ftrace_cnt, id,
- type, PSTORE_TYPE_FTRACE, 0);
+ cxt->max_ftrace_cnt,
+ &record->id,
+ &record->type,
+ PSTORE_TYPE_FTRACE, 0);
if (!prz_ok(prz_next))
continue;
@@ -316,7 +319,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
if (size)
goto out;
}
- *id = 0;
+ record->id = 0;
prz = tmp_prz;
}
}
@@ -329,17 +332,19 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
size = persistent_ram_old_size(prz) - header_length;
/* ECC correction notice */
- *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
+ record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
- *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
- if (*buf == NULL) {
+ record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
+ if (record->buf == NULL) {
size = -ENOMEM;
goto out;
}
- memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
+ memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
+ size);
- persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
+ persistent_ram_ecc_string(prz, record->buf + size,
+ record->ecc_notice_size + 1);
out:
if (free_prz) {
@@ -373,23 +378,18 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
return len;
}
-static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char *buf,
- bool compressed, size_t size,
- struct pstore_info *psi)
+static int notrace ramoops_pstore_write(struct pstore_record *record)
{
- struct ramoops_context *cxt = psi->data;
+ struct ramoops_context *cxt = record->psi->data;
struct persistent_ram_zone *prz;
- size_t hlen;
+ size_t size, hlen;
- if (type == PSTORE_TYPE_CONSOLE) {
+ if (record->type == PSTORE_TYPE_CONSOLE) {
if (!cxt->cprz)
return -ENOMEM;
- persistent_ram_write(cxt->cprz, buf, size);
+ persistent_ram_write(cxt->cprz, record->buf, record->size);
return 0;
- } else if (type == PSTORE_TYPE_FTRACE) {
+ } else if (record->type == PSTORE_TYPE_FTRACE) {
int zonenum;
if (!cxt->fprzs)
@@ -402,33 +402,36 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
else
zonenum = 0;
- persistent_ram_write(cxt->fprzs[zonenum], buf, size);
+ persistent_ram_write(cxt->fprzs[zonenum], record->buf,
+ record->size);
return 0;
- } else if (type == PSTORE_TYPE_PMSG) {
+ } else if (record->type == PSTORE_TYPE_PMSG) {
pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
return -EINVAL;
}
- if (type != PSTORE_TYPE_DMESG)
+ if (record->type != PSTORE_TYPE_DMESG)
return -EINVAL;
- /* Out of the various dmesg dump types, ramoops is currently designed
+ /*
+ * Out of the various dmesg dump types, ramoops is currently designed
* to only store crash logs, rather than storing general kernel logs.
*/
- if (reason != KMSG_DUMP_OOPS &&
- reason != KMSG_DUMP_PANIC)
+ if (record->reason != KMSG_DUMP_OOPS &&
+ record->reason != KMSG_DUMP_PANIC)
return -EINVAL;
/* Skip Oopes when configured to do so. */
- if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
+ if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
return -EINVAL;
- /* Explicitly only take the first part of any new crash.
+ /*
+ * Explicitly only take the first part of any new crash.
* If our buffer is larger than kmsg_bytes, this can never happen,
* and if our buffer is smaller than kmsg_bytes, we don't want the
* report split across multiple records.
*/
- if (part != 1)
+ if (record->part != 1)
return -ENOSPC;
if (!cxt->dprzs)
@@ -436,53 +439,50 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,
prz = cxt->dprzs[cxt->dump_write_cnt];
- hlen = ramoops_write_kmsg_hdr(prz, compressed);
+ /* Build header and append record contents. */
+ hlen = ramoops_write_kmsg_hdr(prz, record->compressed);
+ size = record->size;
if (size + hlen > prz->buffer_size)
size = prz->buffer_size - hlen;
- persistent_ram_write(prz, buf, size);
+ persistent_ram_write(prz, record->buf, size);
cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
return 0;
}
-static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,
- enum kmsg_dump_reason reason,
- u64 *id, unsigned int part,
- const char __user *buf,
- bool compressed, size_t size,
- struct pstore_info *psi)
+static int notrace ramoops_pstore_write_user(struct pstore_record *record,
+ const char __user *buf)
{
- if (type == PSTORE_TYPE_PMSG) {
- struct ramoops_context *cxt = psi->data;
+ if (record->type == PSTORE_TYPE_PMSG) {
+ struct ramoops_context *cxt = record->psi->data;
if (!cxt->mprz)
return -ENOMEM;
- return persistent_ram_write_user(cxt->mprz, buf, size);
+ return persistent_ram_write_user(cxt->mprz, buf, record->size);
}
return -EINVAL;
}
-static int ramoops_pstore_erase(enum pstore_type_id type, u64 id, int count,
- struct timespec time, struct pstore_info *psi)
+static int ramoops_pstore_erase(struct pstore_record *record)
{
- struct ramoops_context *cxt = psi->data;
+ struct ramoops_context *cxt = record->psi->data;
struct persistent_ram_zone *prz;
- switch (type) {
+ switch (record->type) {
case PSTORE_TYPE_DMESG:
- if (id >= cxt->max_dump_cnt)
+ if (record->id >= cxt->max_dump_cnt)
return -EINVAL;
- prz = cxt->dprzs[id];
+ prz = cxt->dprzs[record->id];
break;
case PSTORE_TYPE_CONSOLE:
prz = cxt->cprz;
break;
case PSTORE_TYPE_FTRACE:
- if (id >= cxt->max_ftrace_cnt)
+ if (record->id >= cxt->max_ftrace_cnt)
return -EINVAL;
- prz = cxt->fprzs[id];
+ prz = cxt->fprzs[record->id];
break;
case PSTORE_TYPE_PMSG:
prz = cxt->mprz;
@@ -503,8 +503,8 @@ static struct ramoops_context oops_cxt = {
.name = "ramoops",
.open = ramoops_pstore_open,
.read = ramoops_pstore_read,
- .write_buf = ramoops_pstore_write_buf,
- .write_buf_user = ramoops_pstore_write_buf_user,
+ .write = ramoops_pstore_write,
+ .write_user = ramoops_pstore_write_user,
.erase = ramoops_pstore_erase,
},
};
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index bc927e30bdcc..e11672aa4575 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -532,7 +532,7 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
}
/* Initialize general buffer state. */
- prz->buffer_lock = __RAW_SPIN_LOCK_UNLOCKED(buffer_lock);
+ raw_spin_lock_init(&prz->buffer_lock);
prz->flags = flags;
ret = persistent_ram_buffer_map(start, size, prz, memtype);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-18 15:16:32 +0300