Driver core and printk fixes for 3.5-rc4
Here are some fixes for 3.5-rc4 that resolve the kmsg problems that people have reported showing up after the printk and kmsg changes went into 3.5-rc1. There are also a smattering of other tiny fixes for the extcon and hyper-v drivers that people have reported. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iEYEABECAAYFAk/iNQcACgkQMUfUDdst+yklTQCfZCXFlhA43bZo/8Joqd2pLIIW 2uoAoMze0SlfJeN6Qu7yY0P+qV/f/pc3 =UNFY -----END PGP SIGNATURE----- Merge tag 'driver-core-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core and printk fixes from Greg Kroah-Hartman: "Here are some fixes for 3.5-rc4 that resolve the kmsg problems that people have reported showing up after the printk and kmsg changes went into 3.5-rc1. There are also a smattering of other tiny fixes for the extcon and hyper-v drivers that people have reported. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>" * tag 'driver-core-3.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: extcon: max8997: Add missing kfree for info->edev in max8997_muic_remove() extcon: Set platform drvdata in gpio_extcon_probe() and fix irq leak extcon: Fix wrong index in max8997_extcon_cable[] kmsg - kmsg_dump() fix CONFIG_PRINTK=n compilation printk: return -EINVAL if the message len is bigger than the buf size printk: use mutex lock to stop syslog_seq from going wild kmsg - kmsg_dump() use iterator to receive log buffer content vme: change maintainer e-mail address Extcon: Don't try to create duplicate link names driver core: fixup reversed deferred probe order printk: Fix alignment of buf causing crash on ARM EABI Tools: hv: verify origin of netlink connector message
This commit is contained in:
Linus Torvalds
commit
fe80352460
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@ -7421,7 +7421,7 @@ F: include/linux/vlynq.h
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VME SUBSYSTEM
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M: Martyn Welch <martyn.welch@ge.com>
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M: Manohar Vanga <manohar.vanga@cern.ch>
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M: Manohar Vanga <manohar.vanga@gmail.com>
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M: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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L: devel@driverdev.osuosl.org
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S: Maintained
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@ -68,9 +68,7 @@ static const char *pseries_nvram_os_partitions[] = {
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};
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static void oops_to_nvram(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason,
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const char *old_msgs, unsigned long old_len,
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const char *new_msgs, unsigned long new_len);
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enum kmsg_dump_reason reason);
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static struct kmsg_dumper nvram_kmsg_dumper = {
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.dump = oops_to_nvram
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@ -503,28 +501,6 @@ int __init pSeries_nvram_init(void)
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return 0;
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}
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/*
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* Try to capture the last capture_len bytes of the printk buffer. Return
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* the amount actually captured.
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*/
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static size_t capture_last_msgs(const char *old_msgs, size_t old_len,
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const char *new_msgs, size_t new_len,
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char *captured, size_t capture_len)
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{
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if (new_len >= capture_len) {
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memcpy(captured, new_msgs + (new_len - capture_len),
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capture_len);
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return capture_len;
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} else {
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/* Grab the end of old_msgs. */
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size_t old_tail_len = min(old_len, capture_len - new_len);
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memcpy(captured, old_msgs + (old_len - old_tail_len),
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old_tail_len);
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memcpy(captured + old_tail_len, new_msgs, new_len);
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return old_tail_len + new_len;
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}
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}
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/*
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* Are we using the ibm,rtas-log for oops/panic reports? And if so,
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* would logging this oops/panic overwrite an RTAS event that rtas_errd
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@ -541,27 +517,6 @@ static int clobbering_unread_rtas_event(void)
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NVRAM_RTAS_READ_TIMEOUT);
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}
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/* Squeeze out each line's <n> severity prefix. */
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static size_t elide_severities(char *buf, size_t len)
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{
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char *in, *out, *buf_end = buf + len;
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/* Assume a <n> at the very beginning marks the start of a line. */
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int newline = 1;
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in = out = buf;
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while (in < buf_end) {
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if (newline && in+3 <= buf_end &&
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*in == '<' && isdigit(in[1]) && in[2] == '>') {
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in += 3;
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newline = 0;
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} else {
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newline = (*in == '\n');
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*out++ = *in++;
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}
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}
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return out - buf;
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}
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/* Derived from logfs_compress() */
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static int nvram_compress(const void *in, void *out, size_t inlen,
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size_t outlen)
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@ -619,9 +574,7 @@ static int zip_oops(size_t text_len)
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* partition. If that's too much, go back and capture uncompressed text.
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*/
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static void oops_to_nvram(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason,
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const char *old_msgs, unsigned long old_len,
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const char *new_msgs, unsigned long new_len)
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enum kmsg_dump_reason reason)
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{
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static unsigned int oops_count = 0;
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static bool panicking = false;
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@ -660,14 +613,14 @@ static void oops_to_nvram(struct kmsg_dumper *dumper,
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return;
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if (big_oops_buf) {
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text_len = capture_last_msgs(old_msgs, old_len,
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new_msgs, new_len, big_oops_buf, big_oops_buf_sz);
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text_len = elide_severities(big_oops_buf, text_len);
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kmsg_dump_get_buffer(dumper, false,
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big_oops_buf, big_oops_buf_sz, &text_len);
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rc = zip_oops(text_len);
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}
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if (rc != 0) {
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text_len = capture_last_msgs(old_msgs, old_len,
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new_msgs, new_len, oops_data, oops_data_sz);
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kmsg_dump_rewind(dumper);
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kmsg_dump_get_buffer(dumper, true,
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oops_data, oops_data_sz, &text_len);
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err_type = ERR_TYPE_KERNEL_PANIC;
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*oops_len = (u16) text_len;
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}
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@ -110,19 +110,16 @@ static struct kmsg_dumper dw_dumper;
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static int dumper_registered;
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static void dw_kmsg_dump(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason,
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const char *s1, unsigned long l1,
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const char *s2, unsigned long l2)
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enum kmsg_dump_reason reason)
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{
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int i;
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static char line[1024];
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size_t len;
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/* When run to this, we'd better re-init the HW */
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mrst_early_console_init();
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for (i = 0; i < l1; i++)
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early_mrst_console.write(&early_mrst_console, s1 + i, 1);
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for (i = 0; i < l2; i++)
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early_mrst_console.write(&early_mrst_console, s2 + i, 1);
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while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len))
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early_mrst_console.write(&early_mrst_console, line, len);
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}
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/* Set the ratio rate to 115200, 8n1, IRQ disabled */
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@ -100,7 +100,7 @@ static void driver_deferred_probe_add(struct device *dev)
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mutex_lock(&deferred_probe_mutex);
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if (list_empty(&dev->p->deferred_probe)) {
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dev_dbg(dev, "Added to deferred list\n");
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list_add(&dev->p->deferred_probe, &deferred_probe_pending_list);
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list_add_tail(&dev->p->deferred_probe, &deferred_probe_pending_list);
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}
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mutex_unlock(&deferred_probe_mutex);
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}
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@ -116,8 +116,8 @@ const char *max8997_extcon_cable[] = {
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[5] = "Charge-downstream",
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[6] = "MHL",
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[7] = "Dock-desk",
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[7] = "Dock-card",
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[8] = "JIG",
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[8] = "Dock-card",
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[9] = "JIG",
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NULL,
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};
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@ -514,6 +514,7 @@ static int __devexit max8997_muic_remove(struct platform_device *pdev)
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extcon_dev_unregister(info->edev);
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kfree(info->edev);
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kfree(info);
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return 0;
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@ -762,7 +762,7 @@ int extcon_dev_register(struct extcon_dev *edev, struct device *dev)
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#if defined(CONFIG_ANDROID)
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if (switch_class)
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ret = class_compat_create_link(switch_class, edev->dev,
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dev);
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NULL);
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#endif /* CONFIG_ANDROID */
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spin_lock_init(&edev->lock);
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@ -125,6 +125,7 @@ static int __devinit gpio_extcon_probe(struct platform_device *pdev)
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if (ret < 0)
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goto err_request_irq;
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platform_set_drvdata(pdev, extcon_data);
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/* Perform initial detection */
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gpio_extcon_work(&extcon_data->work.work);
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@ -146,6 +147,7 @@ static int __devexit gpio_extcon_remove(struct platform_device *pdev)
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struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&extcon_data->work);
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free_irq(extcon_data->irq, extcon_data);
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gpio_free(extcon_data->gpio);
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extcon_dev_unregister(&extcon_data->edev);
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devm_kfree(&pdev->dev, extcon_data);
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@ -304,32 +304,17 @@ static void find_next_position(struct mtdoops_context *cxt)
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}
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static void mtdoops_do_dump(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason, const char *s1, unsigned long l1,
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const char *s2, unsigned long l2)
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enum kmsg_dump_reason reason)
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{
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struct mtdoops_context *cxt = container_of(dumper,
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struct mtdoops_context, dump);
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unsigned long s1_start, s2_start;
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unsigned long l1_cpy, l2_cpy;
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char *dst;
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if (reason != KMSG_DUMP_OOPS &&
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reason != KMSG_DUMP_PANIC)
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return;
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/* Only dump oopses if dump_oops is set */
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if (reason == KMSG_DUMP_OOPS && !dump_oops)
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return;
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dst = cxt->oops_buf + MTDOOPS_HEADER_SIZE; /* Skip the header */
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l2_cpy = min(l2, record_size - MTDOOPS_HEADER_SIZE);
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l1_cpy = min(l1, record_size - MTDOOPS_HEADER_SIZE - l2_cpy);
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s2_start = l2 - l2_cpy;
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s1_start = l1 - l1_cpy;
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memcpy(dst, s1 + s1_start, l1_cpy);
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memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
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kmsg_dump_get_buffer(dumper, true, cxt->oops_buf + MTDOOPS_HEADER_SIZE,
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record_size - MTDOOPS_HEADER_SIZE, NULL);
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/* Panics must be written immediately */
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if (reason != KMSG_DUMP_OOPS)
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@ -375,6 +360,7 @@ static void mtdoops_notify_add(struct mtd_info *mtd)
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return;
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}
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cxt->dump.max_reason = KMSG_DUMP_OOPS;
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cxt->dump.dump = mtdoops_do_dump;
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err = kmsg_dump_register(&cxt->dump);
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if (err) {
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@ -94,20 +94,15 @@ static const char *get_reason_str(enum kmsg_dump_reason reason)
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* as we can from the end of the buffer.
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*/
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static void pstore_dump(struct kmsg_dumper *dumper,
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enum kmsg_dump_reason reason,
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const char *s1, unsigned long l1,
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const char *s2, unsigned long l2)
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enum kmsg_dump_reason reason)
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{
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unsigned long s1_start, s2_start;
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unsigned long l1_cpy, l2_cpy;
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unsigned long size, total = 0;
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char *dst;
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unsigned long total = 0;
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const char *why;
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u64 id;
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int hsize, ret;
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unsigned int part = 1;
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unsigned long flags = 0;
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int is_locked = 0;
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int ret;
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why = get_reason_str(reason);
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@ -119,30 +114,25 @@ static void pstore_dump(struct kmsg_dumper *dumper,
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spin_lock_irqsave(&psinfo->buf_lock, flags);
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oopscount++;
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while (total < kmsg_bytes) {
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char *dst;
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unsigned long size;
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int hsize;
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size_t len;
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dst = psinfo->buf;
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hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
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size = psinfo->bufsize - hsize;
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dst += hsize;
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l2_cpy = min(l2, size);
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l1_cpy = min(l1, size - l2_cpy);
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if (l1_cpy + l2_cpy == 0)
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if (!kmsg_dump_get_buffer(dumper, true, dst, size, &len))
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break;
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s2_start = l2 - l2_cpy;
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s1_start = l1 - l1_cpy;
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memcpy(dst, s1 + s1_start, l1_cpy);
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memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
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ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,
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hsize + l1_cpy + l2_cpy, psinfo);
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hsize + len, psinfo);
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if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())
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pstore_new_entry = 1;
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l1 -= l1_cpy;
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l2 -= l2_cpy;
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total += l1_cpy + l2_cpy;
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total += hsize + len;
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part++;
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}
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if (in_nmi()) {
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@ -21,6 +21,7 @@
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* is passed to the kernel.
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*/
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enum kmsg_dump_reason {
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KMSG_DUMP_UNDEF,
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KMSG_DUMP_PANIC,
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KMSG_DUMP_OOPS,
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KMSG_DUMP_EMERG,
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@ -31,23 +32,37 @@ enum kmsg_dump_reason {
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/**
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* struct kmsg_dumper - kernel crash message dumper structure
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* @dump: The callback which gets called on crashes. The buffer is passed
|
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* as two sections, where s1 (length l1) contains the older
|
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* messages and s2 (length l2) contains the newer.
|
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* @list: Entry in the dumper list (private)
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* @dump: Call into dumping code which will retrieve the data with
|
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* through the record iterator
|
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* @max_reason: filter for highest reason number that should be dumped
|
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* @registered: Flag that specifies if this is already registered
|
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*/
|
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struct kmsg_dumper {
|
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void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
|
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const char *s1, unsigned long l1,
|
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const char *s2, unsigned long l2);
|
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struct list_head list;
|
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int registered;
|
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void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
|
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enum kmsg_dump_reason max_reason;
|
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bool active;
|
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bool registered;
|
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|
||||
/* private state of the kmsg iterator */
|
||||
u32 cur_idx;
|
||||
u32 next_idx;
|
||||
u64 cur_seq;
|
||||
u64 next_seq;
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PRINTK
|
||||
void kmsg_dump(enum kmsg_dump_reason reason);
|
||||
|
||||
bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
|
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char *line, size_t size, size_t *len);
|
||||
|
||||
bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
|
||||
char *buf, size_t size, size_t *len);
|
||||
|
||||
void kmsg_dump_rewind(struct kmsg_dumper *dumper);
|
||||
|
||||
int kmsg_dump_register(struct kmsg_dumper *dumper);
|
||||
|
||||
int kmsg_dump_unregister(struct kmsg_dumper *dumper);
|
||||
|
|
@ -56,6 +71,22 @@ static inline void kmsg_dump(enum kmsg_dump_reason reason)
|
|||
{
|
||||
}
|
||||
|
||||
static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
|
||||
const char *line, size_t size, size_t *len)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
|
||||
char *buf, size_t size, size_t *len)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
|
||||
{
|
||||
}
|
||||
|
||||
static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
|
||||
{
|
||||
return -EINVAL;
|
||||
|
|
|
|||
247
kernel/printk.c
247
kernel/printk.c
|
|
@ -227,10 +227,10 @@ static u32 clear_idx;
|
|||
#define LOG_LINE_MAX 1024
|
||||
|
||||
/* record buffer */
|
||||
#if !defined(CONFIG_64BIT) || defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
||||
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
|
||||
#define LOG_ALIGN 4
|
||||
#else
|
||||
#define LOG_ALIGN 8
|
||||
#define LOG_ALIGN __alignof__(struct log)
|
||||
#endif
|
||||
#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
|
||||
static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
|
||||
|
|
@ -414,7 +414,9 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf,
|
|||
if (!user)
|
||||
return -EBADF;
|
||||
|
||||
mutex_lock(&user->lock);
|
||||
ret = mutex_lock_interruptible(&user->lock);
|
||||
if (ret)
|
||||
return ret;
|
||||
raw_spin_lock(&logbuf_lock);
|
||||
while (user->seq == log_next_seq) {
|
||||
if (file->f_flags & O_NONBLOCK) {
|
||||
|
|
@ -878,7 +880,9 @@ static int syslog_print(char __user *buf, int size)
|
|||
syslog_seq++;
|
||||
raw_spin_unlock_irq(&logbuf_lock);
|
||||
|
||||
if (len > 0 && copy_to_user(buf, text, len))
|
||||
if (len > size)
|
||||
len = -EINVAL;
|
||||
else if (len > 0 && copy_to_user(buf, text, len))
|
||||
len = -EFAULT;
|
||||
|
||||
kfree(text);
|
||||
|
|
@ -919,6 +923,8 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
|
|||
idx = log_next(idx);
|
||||
seq++;
|
||||
}
|
||||
|
||||
/* move first record forward until length fits into the buffer */
|
||||
seq = clear_seq;
|
||||
idx = clear_idx;
|
||||
while (len > size && seq < log_next_seq) {
|
||||
|
|
@ -929,7 +935,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
|
|||
seq++;
|
||||
}
|
||||
|
||||
/* last message in this dump */
|
||||
/* last message fitting into this dump */
|
||||
next_seq = log_next_seq;
|
||||
|
||||
len = 0;
|
||||
|
|
@ -974,6 +980,7 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
|
|||
{
|
||||
bool clear = false;
|
||||
static int saved_console_loglevel = -1;
|
||||
static DEFINE_MUTEX(syslog_mutex);
|
||||
int error;
|
||||
|
||||
error = check_syslog_permissions(type, from_file);
|
||||
|
|
@ -1000,11 +1007,17 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
|
|||
error = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
error = wait_event_interruptible(log_wait,
|
||||
syslog_seq != log_next_seq);
|
||||
error = mutex_lock_interruptible(&syslog_mutex);
|
||||
if (error)
|
||||
goto out;
|
||||
error = wait_event_interruptible(log_wait,
|
||||
syslog_seq != log_next_seq);
|
||||
if (error) {
|
||||
mutex_unlock(&syslog_mutex);
|
||||
goto out;
|
||||
}
|
||||
error = syslog_print(buf, len);
|
||||
mutex_unlock(&syslog_mutex);
|
||||
break;
|
||||
/* Read/clear last kernel messages */
|
||||
case SYSLOG_ACTION_READ_CLEAR:
|
||||
|
|
@ -2300,48 +2313,210 @@ module_param_named(always_kmsg_dump, always_kmsg_dump, bool, S_IRUGO | S_IWUSR);
|
|||
* kmsg_dump - dump kernel log to kernel message dumpers.
|
||||
* @reason: the reason (oops, panic etc) for dumping
|
||||
*
|
||||
* Iterate through each of the dump devices and call the oops/panic
|
||||
* callbacks with the log buffer.
|
||||
* Call each of the registered dumper's dump() callback, which can
|
||||
* retrieve the kmsg records with kmsg_dump_get_line() or
|
||||
* kmsg_dump_get_buffer().
|
||||
*/
|
||||
void kmsg_dump(enum kmsg_dump_reason reason)
|
||||
{
|
||||
u64 idx;
|
||||
struct kmsg_dumper *dumper;
|
||||
const char *s1, *s2;
|
||||
unsigned long l1, l2;
|
||||
unsigned long flags;
|
||||
|
||||
if ((reason > KMSG_DUMP_OOPS) && !always_kmsg_dump)
|
||||
return;
|
||||
|
||||
/* Theoretically, the log could move on after we do this, but
|
||||
there's not a lot we can do about that. The new messages
|
||||
will overwrite the start of what we dump. */
|
||||
rcu_read_lock();
|
||||
list_for_each_entry_rcu(dumper, &dump_list, list) {
|
||||
if (dumper->max_reason && reason > dumper->max_reason)
|
||||
continue;
|
||||
|
||||
/* initialize iterator with data about the stored records */
|
||||
dumper->active = true;
|
||||
|
||||
raw_spin_lock_irqsave(&logbuf_lock, flags);
|
||||
if (syslog_seq < log_first_seq)
|
||||
idx = syslog_idx;
|
||||
else
|
||||
idx = log_first_idx;
|
||||
|
||||
if (idx > log_next_idx) {
|
||||
s1 = log_buf;
|
||||
l1 = log_next_idx;
|
||||
|
||||
s2 = log_buf + idx;
|
||||
l2 = log_buf_len - idx;
|
||||
} else {
|
||||
s1 = "";
|
||||
l1 = 0;
|
||||
|
||||
s2 = log_buf + idx;
|
||||
l2 = log_next_idx - idx;
|
||||
}
|
||||
dumper->cur_seq = clear_seq;
|
||||
dumper->cur_idx = clear_idx;
|
||||
dumper->next_seq = log_next_seq;
|
||||
dumper->next_idx = log_next_idx;
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
|
||||
rcu_read_lock();
|
||||
list_for_each_entry_rcu(dumper, &dump_list, list)
|
||||
dumper->dump(dumper, reason, s1, l1, s2, l2);
|
||||
/* invoke dumper which will iterate over records */
|
||||
dumper->dump(dumper, reason);
|
||||
|
||||
/* reset iterator */
|
||||
dumper->active = false;
|
||||
}
|
||||
rcu_read_unlock();
|
||||
}
|
||||
|
||||
/**
|
||||
* kmsg_dump_get_line - retrieve one kmsg log line
|
||||
* @dumper: registered kmsg dumper
|
||||
* @syslog: include the "<4>" prefixes
|
||||
* @line: buffer to copy the line to
|
||||
* @size: maximum size of the buffer
|
||||
* @len: length of line placed into buffer
|
||||
*
|
||||
* Start at the beginning of the kmsg buffer, with the oldest kmsg
|
||||
* record, and copy one record into the provided buffer.
|
||||
*
|
||||
* Consecutive calls will return the next available record moving
|
||||
* towards the end of the buffer with the youngest messages.
|
||||
*
|
||||
* A return value of FALSE indicates that there are no more records to
|
||||
* read.
|
||||
*/
|
||||
bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
|
||||
char *line, size_t size, size_t *len)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct log *msg;
|
||||
size_t l = 0;
|
||||
bool ret = false;
|
||||
|
||||
if (!dumper->active)
|
||||
goto out;
|
||||
|
||||
raw_spin_lock_irqsave(&logbuf_lock, flags);
|
||||
if (dumper->cur_seq < log_first_seq) {
|
||||
/* messages are gone, move to first available one */
|
||||
dumper->cur_seq = log_first_seq;
|
||||
dumper->cur_idx = log_first_idx;
|
||||
}
|
||||
|
||||
/* last entry */
|
||||
if (dumper->cur_seq >= log_next_seq) {
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
goto out;
|
||||
}
|
||||
|
||||
msg = log_from_idx(dumper->cur_idx);
|
||||
l = msg_print_text(msg, syslog,
|
||||
line, size);
|
||||
|
||||
dumper->cur_idx = log_next(dumper->cur_idx);
|
||||
dumper->cur_seq++;
|
||||
ret = true;
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
out:
|
||||
if (len)
|
||||
*len = l;
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kmsg_dump_get_line);
|
||||
|
||||
/**
|
||||
* kmsg_dump_get_buffer - copy kmsg log lines
|
||||
* @dumper: registered kmsg dumper
|
||||
* @syslog: include the "<4>" prefixes
|
||||
* @line: buffer to copy the line to
|
||||
* @size: maximum size of the buffer
|
||||
* @len: length of line placed into buffer
|
||||
*
|
||||
* Start at the end of the kmsg buffer and fill the provided buffer
|
||||
* with as many of the the *youngest* kmsg records that fit into it.
|
||||
* If the buffer is large enough, all available kmsg records will be
|
||||
* copied with a single call.
|
||||
*
|
||||
* Consecutive calls will fill the buffer with the next block of
|
||||
* available older records, not including the earlier retrieved ones.
|
||||
*
|
||||
* A return value of FALSE indicates that there are no more records to
|
||||
* read.
|
||||
*/
|
||||
bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
|
||||
char *buf, size_t size, size_t *len)
|
||||
{
|
||||
unsigned long flags;
|
||||
u64 seq;
|
||||
u32 idx;
|
||||
u64 next_seq;
|
||||
u32 next_idx;
|
||||
size_t l = 0;
|
||||
bool ret = false;
|
||||
|
||||
if (!dumper->active)
|
||||
goto out;
|
||||
|
||||
raw_spin_lock_irqsave(&logbuf_lock, flags);
|
||||
if (dumper->cur_seq < log_first_seq) {
|
||||
/* messages are gone, move to first available one */
|
||||
dumper->cur_seq = log_first_seq;
|
||||
dumper->cur_idx = log_first_idx;
|
||||
}
|
||||
|
||||
/* last entry */
|
||||
if (dumper->cur_seq >= dumper->next_seq) {
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* calculate length of entire buffer */
|
||||
seq = dumper->cur_seq;
|
||||
idx = dumper->cur_idx;
|
||||
while (seq < dumper->next_seq) {
|
||||
struct log *msg = log_from_idx(idx);
|
||||
|
||||
l += msg_print_text(msg, true, NULL, 0);
|
||||
idx = log_next(idx);
|
||||
seq++;
|
||||
}
|
||||
|
||||
/* move first record forward until length fits into the buffer */
|
||||
seq = dumper->cur_seq;
|
||||
idx = dumper->cur_idx;
|
||||
while (l > size && seq < dumper->next_seq) {
|
||||
struct log *msg = log_from_idx(idx);
|
||||
|
||||
l -= msg_print_text(msg, true, NULL, 0);
|
||||
idx = log_next(idx);
|
||||
seq++;
|
||||
}
|
||||
|
||||
/* last message in next interation */
|
||||
next_seq = seq;
|
||||
next_idx = idx;
|
||||
|
||||
l = 0;
|
||||
while (seq < dumper->next_seq) {
|
||||
struct log *msg = log_from_idx(idx);
|
||||
|
||||
l += msg_print_text(msg, syslog,
|
||||
buf + l, size - l);
|
||||
|
||||
idx = log_next(idx);
|
||||
seq++;
|
||||
}
|
||||
|
||||
dumper->next_seq = next_seq;
|
||||
dumper->next_idx = next_idx;
|
||||
ret = true;
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
out:
|
||||
if (len)
|
||||
*len = l;
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kmsg_dump_get_buffer);
|
||||
|
||||
/**
|
||||
* kmsg_dump_rewind - reset the interator
|
||||
* @dumper: registered kmsg dumper
|
||||
*
|
||||
* Reset the dumper's iterator so that kmsg_dump_get_line() and
|
||||
* kmsg_dump_get_buffer() can be called again and used multiple
|
||||
* times within the same dumper.dump() callback.
|
||||
*/
|
||||
void kmsg_dump_rewind(struct kmsg_dumper *dumper)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
raw_spin_lock_irqsave(&logbuf_lock, flags);
|
||||
dumper->cur_seq = clear_seq;
|
||||
dumper->cur_idx = clear_idx;
|
||||
dumper->next_seq = log_next_seq;
|
||||
dumper->next_idx = log_next_idx;
|
||||
raw_spin_unlock_irqrestore(&logbuf_lock, flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kmsg_dump_rewind);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -701,14 +701,18 @@ int main(void)
|
|||
pfd.fd = fd;
|
||||
|
||||
while (1) {
|
||||
struct sockaddr *addr_p = (struct sockaddr *) &addr;
|
||||
socklen_t addr_l = sizeof(addr);
|
||||
pfd.events = POLLIN;
|
||||
pfd.revents = 0;
|
||||
poll(&pfd, 1, -1);
|
||||
|
||||
len = recv(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0);
|
||||
len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
|
||||
addr_p, &addr_l);
|
||||
|
||||
if (len < 0) {
|
||||
syslog(LOG_ERR, "recv failed; error:%d", len);
|
||||
if (len < 0 || addr.nl_pid) {
|
||||
syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
|
||||
addr.nl_pid, errno, strerror(errno));
|
||||
close(fd);
|
||||
return -1;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue