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authorLinus Torvalds <torvalds@linux-foundation.org>2011-08-01 13:40:51 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-01 13:40:51 -1000
commita2d773023552f68baa2db2226dfd6d761c0df5da (patch)
treec905702c4f318d0e569222187472289c574bde3c /fs
parent72f9adfd20e3be8a33ff3ef96cec787ed97b9ba9 (diff)
parent7644c16c7e7431fa398e834109dbb76dc1b51617 (diff)
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Merge branch 'pstore-efi' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
* 'pstore-efi' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: efivars: Introduce PSTORE_EFI_ATTRIBUTES efivars: Use string functions in pstore_write efivars: introduce utf16_strncmp efivars: String functions efi: Add support for using efivars as a pstore backend pstore: Allow the user to explicitly choose a backend pstore: Make "part" unsigned pstore: Add extra context for writes and erases pstore: Extend API for more flexibility in new backends
Diffstat (limited to 'fs')
-rw-r--r--fs/pstore/inode.c12
-rw-r--r--fs/pstore/internal.h2
-rw-r--r--fs/pstore/platform.c30
3 files changed, 30 insertions, 14 deletions
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 977ed272384..893b961dcfd 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -39,8 +39,9 @@
#define PSTORE_NAMELEN 64
struct pstore_private {
+ struct pstore_info *psi;
+ enum pstore_type_id type;
u64 id;
- int (*erase)(u64);
ssize_t size;
char data[];
};
@@ -73,7 +74,7 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
{
struct pstore_private *p = dentry->d_inode->i_private;
- p->erase(p->id);
+ p->psi->erase(p->type, p->id, p->psi);
return simple_unlink(dir, dentry);
}
@@ -175,8 +176,8 @@ 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,
- char *data, size_t size,
- struct timespec time, int (*erase)(u64))
+ char *data, size_t size, struct timespec time,
+ struct pstore_info *psi)
{
struct dentry *root = pstore_sb->s_root;
struct dentry *dentry;
@@ -192,8 +193,9 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
private = kmalloc(sizeof *private + size, GFP_KERNEL);
if (!private)
goto fail_alloc;
+ private->type = type;
private->id = id;
- private->erase = erase;
+ private->psi = psi;
switch (type) {
case PSTORE_TYPE_DMESG:
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 8c9f23eb164..611c1b3c46f 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -2,5 +2,5 @@ extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(void);
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
char *data, size_t size,
- struct timespec time, int (*erase)(u64));
+ struct timespec time, struct pstore_info *psi);
extern int pstore_is_mounted(void);
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index f2c3ff20ea6..c5300ec3169 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -37,6 +37,8 @@
static DEFINE_SPINLOCK(pstore_lock);
static struct pstore_info *psinfo;
+static char *backend;
+
/* How much of the console log to snapshot */
static unsigned long kmsg_bytes = 10240;
@@ -67,7 +69,8 @@ static void pstore_dump(struct kmsg_dumper *dumper,
unsigned long size, total = 0;
char *dst, *why;
u64 id;
- int hsize, part = 1;
+ int hsize;
+ unsigned int part = 1;
if (reason < ARRAY_SIZE(reason_str))
why = reason_str[reason];
@@ -78,7 +81,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
oopscount++;
while (total < kmsg_bytes) {
dst = psinfo->buf;
- hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part++);
+ hsize = sprintf(dst, "%s#%d Part%d\n", why, oopscount, part);
size = psinfo->bufsize - hsize;
dst += hsize;
@@ -94,14 +97,16 @@ static void pstore_dump(struct kmsg_dumper *dumper,
memcpy(dst, s1 + s1_start, l1_cpy);
memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
- id = psinfo->write(PSTORE_TYPE_DMESG, hsize + l1_cpy + l2_cpy);
+ id = psinfo->write(PSTORE_TYPE_DMESG, part,
+ hsize + l1_cpy + l2_cpy, psinfo);
if (reason == KMSG_DUMP_OOPS && pstore_is_mounted())
pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id,
psinfo->buf, hsize + l1_cpy + l2_cpy,
- CURRENT_TIME, psinfo->erase);
+ CURRENT_TIME, psinfo);
l1 -= l1_cpy;
l2 -= l2_cpy;
total += l1_cpy + l2_cpy;
+ part++;
}
mutex_unlock(&psinfo->buf_mutex);
}
@@ -128,6 +133,12 @@ int pstore_register(struct pstore_info *psi)
spin_unlock(&pstore_lock);
return -EBUSY;
}
+
+ if (backend && strcmp(backend, psi->name)) {
+ spin_unlock(&pstore_lock);
+ return -EINVAL;
+ }
+
psinfo = psi;
spin_unlock(&pstore_lock);
@@ -166,9 +177,9 @@ void pstore_get_records(void)
if (rc)
goto out;
- while ((size = psi->read(&id, &type, &time)) > 0) {
+ while ((size = psi->read(&id, &type, &time, psi)) > 0) {
if (pstore_mkfile(type, psi->name, id, psi->buf, (size_t)size,
- time, psi->erase))
+ time, psi))
failed++;
}
psi->close(psi);
@@ -196,12 +207,15 @@ int pstore_write(enum pstore_type_id type, char *buf, size_t size)
mutex_lock(&psinfo->buf_mutex);
memcpy(psinfo->buf, buf, size);
- id = psinfo->write(type, size);
+ id = psinfo->write(type, 0, size, psinfo);
if (pstore_is_mounted())
pstore_mkfile(PSTORE_TYPE_DMESG, psinfo->name, id, psinfo->buf,
- size, CURRENT_TIME, psinfo->erase);
+ size, CURRENT_TIME, psinfo);
mutex_unlock(&psinfo->buf_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(pstore_write);
+
+module_param(backend, charp, 0444);
+MODULE_PARM_DESC(backend, "Pstore backend to use");