diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/pstore/Kconfig | 2 | ||||
| -rw-r--r-- | fs/pstore/inode.c | 10 | ||||
| -rw-r--r-- | fs/pstore/internal.h | 5 | ||||
| -rw-r--r-- | fs/pstore/platform.c | 212 | ||||
| -rw-r--r-- | fs/pstore/ram.c | 47 |
5 files changed, 242 insertions, 34 deletions
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index ca71db6..983d951 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -1,6 +1,8 @@ config PSTORE bool "Persistent store support" default n + select ZLIB_DEFLATE + select ZLIB_INFLATE help This option enables generic access to platform level persistent storage via "pstore" filesystem that can diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c index 71bf5f4..1282384 100644 --- a/fs/pstore/inode.c +++ b/fs/pstore/inode.c @@ -275,8 +275,8 @@ int pstore_is_mounted(void) * 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, size_t size, struct timespec time, - struct pstore_info *psi) + char *data, bool compressed, size_t size, + struct timespec time, struct pstore_info *psi) { struct dentry *root = pstore_sb->s_root; struct dentry *dentry; @@ -315,7 +315,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count, switch (type) { case PSTORE_TYPE_DMESG: - sprintf(name, "dmesg-%s-%lld", psname, id); + sprintf(name, "dmesg-%s-%lld%s", psname, id, + compressed ? ".enc.z" : ""); break; case PSTORE_TYPE_CONSOLE: sprintf(name, "console-%s", psname); @@ -345,9 +346,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count, mutex_lock(&root->d_inode->i_mutex); - rc = -ENOSPC; dentry = d_alloc_name(root, name); - if (IS_ERR(dentry)) + if (!dentry) goto fail_lockedalloc; memcpy(private->data, data, size); diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h index 937d820..3b3d305 100644 --- a/fs/pstore/internal.h +++ b/fs/pstore/internal.h @@ -50,8 +50,9 @@ 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, size_t size, - struct timespec time, struct pstore_info *psi); + int count, char *data, bool compressed, + size_t size, struct timespec time, + struct pstore_info *psi); extern int pstore_is_mounted(void); #endif diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 422962a..4ffb7ab 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -26,6 +26,7 @@ #include <linux/console.h> #include <linux/module.h> #include <linux/pstore.h> +#include <linux/zlib.h> #include <linux/string.h> #include <linux/timer.h> #include <linux/slab.h> @@ -65,6 +66,15 @@ struct pstore_info *psinfo; static char *backend; +/* Compression parameters */ +#define COMPR_LEVEL 6 +#define WINDOW_BITS 12 +#define MEM_LEVEL 4 +static struct z_stream_s stream; + +static char *big_oops_buf; +static size_t big_oops_buf_sz; + /* How much of the console log to snapshot */ static unsigned long kmsg_bytes = 10240; @@ -117,6 +127,121 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason) } EXPORT_SYMBOL_GPL(pstore_cannot_block_path); +/* Derived from logfs_compress() */ +static int pstore_compress(const void *in, void *out, size_t inlen, + size_t outlen) +{ + int err, ret; + + ret = -EIO; + err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS, + MEM_LEVEL, Z_DEFAULT_STRATEGY); + if (err != Z_OK) + goto error; + + stream.next_in = in; + stream.avail_in = inlen; + stream.total_in = 0; + stream.next_out = out; + stream.avail_out = outlen; + stream.total_out = 0; + + err = zlib_deflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) + goto error; + + err = zlib_deflateEnd(&stream); + if (err != Z_OK) + goto error; + + if (stream.total_out >= stream.total_in) + goto error; + + ret = stream.total_out; +error: + return ret; +} + +/* Derived from logfs_uncompress */ +static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen) +{ + int err, ret; + + ret = -EIO; + err = zlib_inflateInit(&stream); + if (err != Z_OK) + goto error; + + stream.next_in = in; + stream.avail_in = inlen; + stream.total_in = 0; + stream.next_out = out; + stream.avail_out = outlen; + stream.total_out = 0; + + err = zlib_inflate(&stream, Z_FINISH); + if (err != Z_STREAM_END) + goto error; + + err = zlib_inflateEnd(&stream); + if (err != Z_OK) + goto error; + + ret = stream.total_out; +error: + return ret; +} + +static void allocate_buf_for_compression(void) +{ + size_t size; + + big_oops_buf_sz = (psinfo->bufsize * 100) / 45; + big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL); + if (big_oops_buf) { + size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL), + zlib_inflate_workspacesize()); + stream.workspace = kmalloc(size, GFP_KERNEL); + if (!stream.workspace) { + pr_err("pstore: No memory for compression workspace; " + "skipping compression\n"); + kfree(big_oops_buf); + big_oops_buf = NULL; + } + } else { + pr_err("No memory for uncompressed data; " + "skipping compression\n"); + stream.workspace = NULL; + } + +} + +/* + * Called when compression fails, since the printk buffer + * would be fetched for compression calling it again when + * compression fails would have moved the iterator of + * printk buffer which results in fetching old contents. + * Copy the recent messages from big_oops_buf to psinfo->buf + */ +static size_t copy_kmsg_to_buffer(int hsize, size_t len) +{ + size_t total_len; + size_t diff; + + total_len = hsize + len; + + if (total_len > psinfo->bufsize) { + diff = total_len - psinfo->bufsize + hsize; + memcpy(psinfo->buf, big_oops_buf, hsize); + memcpy(psinfo->buf + hsize, big_oops_buf + diff, + psinfo->bufsize - hsize); + total_len = psinfo->bufsize; + } else + memcpy(psinfo->buf, big_oops_buf, total_len); + + return total_len; +} + /* * callback from kmsg_dump. (s2,l2) has the most recently * written bytes, older bytes are in (s1,l1). Save as much @@ -148,22 +273,56 @@ static void pstore_dump(struct kmsg_dumper *dumper, char *dst; unsigned long size; int hsize; + int zipped_len = -1; size_t len; + bool compressed; + size_t total_len; - dst = psinfo->buf; - hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part); - size = psinfo->bufsize - hsize; - dst += hsize; + if (big_oops_buf) { + dst = big_oops_buf; + hsize = sprintf(dst, "%s#%d Part%d\n", why, + oopscount, part); + size = big_oops_buf_sz - hsize; - if (!kmsg_dump_get_buffer(dumper, true, dst, size, &len)) - break; + if (!kmsg_dump_get_buffer(dumper, true, dst + hsize, + size, &len)) + break; + + zipped_len = pstore_compress(dst, psinfo->buf, + hsize + len, psinfo->bufsize); + + if (zipped_len > 0) { + compressed = true; + total_len = zipped_len; + } else { + pr_err("pstore: compression failed for Part %d" + " returned %d\n", part, zipped_len); + pr_err("pstore: Capture uncompressed" + " oops/panic report of Part %d\n", part); + compressed = false; + total_len = copy_kmsg_to_buffer(hsize, len); + } + } else { + dst = psinfo->buf; + hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, + part); + size = psinfo->bufsize - hsize; + dst += hsize; + + if (!kmsg_dump_get_buffer(dumper, true, dst, + size, &len)) + break; + + compressed = false; + total_len = hsize + len; + } ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part, - oopscount, hsize, hsize + len, psinfo); + oopscount, compressed, total_len, psinfo); if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted()) pstore_new_entry = 1; - total += hsize + len; + total += total_len; part++; } if (pstore_cannot_block_path(reason)) { @@ -221,10 +380,10 @@ static void pstore_register_console(void) {} static int pstore_write_compat(enum pstore_type_id type, enum kmsg_dump_reason reason, u64 *id, unsigned int part, int count, - size_t hsize, size_t size, + bool compressed, size_t size, struct pstore_info *psi) { - return psi->write_buf(type, reason, id, part, psinfo->buf, hsize, + return psi->write_buf(type, reason, id, part, psinfo->buf, compressed, size, psi); } @@ -261,6 +420,8 @@ int pstore_register(struct pstore_info *psi) return -EINVAL; } + allocate_buf_for_compression(); + if (pstore_is_mounted()) pstore_get_records(0); @@ -297,6 +458,8 @@ void pstore_get_records(int quiet) enum pstore_type_id type; struct timespec time; int failed = 0, rc; + bool compressed; + int unzipped_len = -1; if (!psi) return; @@ -305,11 +468,32 @@ void pstore_get_records(int quiet) if (psi->open && psi->open(psi)) goto out; - while ((size = psi->read(&id, &type, &count, &time, &buf, psi)) > 0) { + while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed, + 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) { + buf = big_oops_buf; + size = unzipped_len; + compressed = false; + } else { + pr_err("pstore: decompression failed;" + "returned %d\n", unzipped_len); + compressed = true; + } + } rc = pstore_mkfile(type, psi->name, id, count, buf, - (size_t)size, time, psi); - kfree(buf); - buf = NULL; + compressed, (size_t)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++; } diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index a6119f9..fa8cef2 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -131,9 +131,31 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max, return prz; } +static void ramoops_read_kmsg_hdr(char *buffer, struct timespec *time, + bool *compressed) +{ + char data_type; + + if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", + &time->tv_sec, &time->tv_nsec, &data_type) == 3) { + if (data_type == 'C') + *compressed = true; + else + *compressed = false; + } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu\n", + &time->tv_sec, &time->tv_nsec) == 2) { + *compressed = false; + } else { + time->tv_sec = 0; + time->tv_nsec = 0; + *compressed = false; + } +} + static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, int *count, struct timespec *time, - char **buf, struct pstore_info *psi) + char **buf, bool *compressed, + struct pstore_info *psi) { ssize_t size; ssize_t ecc_notice_size; @@ -152,10 +174,6 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, if (!prz) return 0; - /* TODO(kees): Bogus time for the moment. */ - time->tv_sec = 0; - time->tv_nsec = 0; - size = persistent_ram_old_size(prz); /* ECC correction notice */ @@ -166,12 +184,14 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type, return -ENOMEM; memcpy(*buf, persistent_ram_old(prz), size); + ramoops_read_kmsg_hdr(*buf, time, compressed); persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1); return size + ecc_notice_size; } -static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz) +static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, + bool compressed) { char *hdr; struct timespec timestamp; @@ -182,8 +202,9 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz) timestamp.tv_sec = 0; timestamp.tv_nsec = 0; } - hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n", - (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000)); + hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n", + (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000), + compressed ? 'C' : 'D'); WARN_ON_ONCE(!hdr); len = hdr ? strlen(hdr) : 0; persistent_ram_write(prz, hdr, len); @@ -196,7 +217,7 @@ 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, - size_t hsize, size_t size, + bool compressed, size_t size, struct pstore_info *psi) { struct ramoops_context *cxt = psi->data; @@ -242,7 +263,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, prz = cxt->przs[cxt->dump_write_cnt]; - hlen = ramoops_write_kmsg_hdr(prz); + hlen = ramoops_write_kmsg_hdr(prz, compressed); if (size + hlen > prz->buffer_size) size = prz->buffer_size - hlen; persistent_ram_write(prz, buf, size); @@ -400,11 +421,11 @@ static int ramoops_probe(struct platform_device *pdev) goto fail_out; } - if (!is_power_of_2(pdata->record_size)) + if (pdata->record_size && !is_power_of_2(pdata->record_size)) pdata->record_size = rounddown_pow_of_two(pdata->record_size); - if (!is_power_of_2(pdata->console_size)) + if (pdata->console_size && !is_power_of_2(pdata->console_size)) pdata->console_size = rounddown_pow_of_two(pdata->console_size); - if (!is_power_of_2(pdata->ftrace_size)) + if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size)) pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); cxt->dump_read_cnt = 0; |