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OpenCloudOS-Kernel
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mtd: introduce mtd_panic_write interface 

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2011-12-23 18:03:17 +02:00 committed by David Woodhouse
parent eda95cbf75
commit 7ae79d7ff1
3 changed files with 19 additions and 14 deletions
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4
drivers/mtd/mtdoops.c
View File

@ -222,8 +222,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
hdr[1] = MTDOOPS_KERNMSG_MAGIC; hdr[1] = MTDOOPS_KERNMSG_MAGIC;
if (panic) if (panic)
ret = mtd->panic_write(mtd, cxt->nextpage * record_size, ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
record_size, &retlen, cxt->oops_buf); record_size, &retlen, cxt->oops_buf);
else else
ret = mtd_write(mtd, cxt->nextpage * record_size, ret = mtd_write(mtd, cxt->nextpage * record_size,
record_size, &retlen, cxt->oops_buf); record_size, &retlen, cxt->oops_buf);

4
drivers/mtd/mtdpart.c
View File

@ -201,8 +201,8 @@ static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
len = 0; len = 0;
else if (to + len > mtd->size) else if (to + len > mtd->size)
len = mtd->size - to; len = mtd->size - to;
return part->master->panic_write(part->master, to + part->offset, return mtd_panic_write(part->master, to + part->offset, len, retlen,
len, retlen, buf); buf);
} }
static int part_write_oob(struct mtd_info *mtd, loff_t to, static int part_write_oob(struct mtd_info *mtd, loff_t to,

25
include/linux/mtd/mtd.h
View File

@ -186,6 +186,8 @@ struct mtd_info {
size_t *retlen, u_char *buf); size_t *retlen, u_char *buf);
int (*write) (struct mtd_info *mtd, loff_t to, size_t len, int (*write) (struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf); size_t *retlen, const u_char *buf);
int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf);
/* Backing device capabilities for this device /* Backing device capabilities for this device
* - provides mmap capabilities * - provides mmap capabilities
@ -193,16 +195,6 @@ struct mtd_info {
struct backing_dev_info *backing_dev_info; struct backing_dev_info *backing_dev_info;
/* In blackbox flight recorder like scenarios we want to make successful
writes in interrupt context. panic_write() is only intended to be
called when its known the kernel is about to panic and we need the
write to succeed. Since the kernel is not going to be running for much
longer, this function can break locks and delay to ensure the write
succeeds (but not sleep). */
int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
int (*read_oob) (struct mtd_info *mtd, loff_t from, int (*read_oob) (struct mtd_info *mtd, loff_t from,
struct mtd_oob_ops *ops); struct mtd_oob_ops *ops);
int (*write_oob) (struct mtd_info *mtd, loff_t to, int (*write_oob) (struct mtd_info *mtd, loff_t to,
@ -315,6 +307,19 @@ static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
return mtd->write(mtd, to, len, retlen, buf); return mtd->write(mtd, to, len, retlen, buf);
} }
/*
* In blackbox flight recorder like scenarios we want to make successful writes
* in interrupt context. panic_write() is only intended to be called when its
* known the kernel is about to panic and we need the write to succeed. Since
* the kernel is not going to be running for much longer, this function can
* break locks and delay to ensure the write succeeds (but not sleep).
*/
static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
return mtd->panic_write(mtd, to, len, retlen, buf);
}
static inline struct mtd_info *dev_to_mtd(struct device *dev) static inline struct mtd_info *dev_to_mtd(struct device *dev)
{ {
return dev ? dev_get_drvdata(dev) : NULL; return dev ? dev_get_drvdata(dev) : NULL;