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>
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eda95cbf75
Коммит
7ae79d7ff1
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@ -222,8 +222,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
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hdr[1] = MTDOOPS_KERNMSG_MAGIC;
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if (panic)
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ret = mtd->panic_write(mtd, cxt->nextpage * record_size,
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record_size, &retlen, cxt->oops_buf);
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ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
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record_size, &retlen, cxt->oops_buf);
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else
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ret = mtd_write(mtd, cxt->nextpage * record_size,
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record_size, &retlen, cxt->oops_buf);
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@ -201,8 +201,8 @@ static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
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len = 0;
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else if (to + len > mtd->size)
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len = mtd->size - to;
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return part->master->panic_write(part->master, to + part->offset,
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len, retlen, buf);
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return mtd_panic_write(part->master, to + part->offset, len, retlen,
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buf);
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}
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static int part_write_oob(struct mtd_info *mtd, loff_t to,
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@ -186,6 +186,8 @@ struct mtd_info {
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size_t *retlen, u_char *buf);
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int (*write) (struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf);
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int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf);
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/* Backing device capabilities for this device
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* - provides mmap capabilities
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@ -193,16 +195,6 @@ struct mtd_info {
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struct backing_dev_info *backing_dev_info;
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/* In blackbox flight recorder like scenarios we want to make successful
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writes in interrupt context. panic_write() is only intended to be
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called when its known the kernel is about to panic and we need the
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write to succeed. Since the kernel is not going to be running for much
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longer, this function can break locks and delay to ensure the write
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succeeds (but not sleep). */
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int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
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int (*read_oob) (struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops);
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int (*write_oob) (struct mtd_info *mtd, loff_t to,
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@ -315,6 +307,19 @@ static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
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return mtd->write(mtd, to, len, retlen, buf);
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}
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/*
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* In blackbox flight recorder like scenarios we want to make successful writes
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* in interrupt context. panic_write() is only intended to be called when its
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* known the kernel is about to panic and we need the write to succeed. Since
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* the kernel is not going to be running for much longer, this function can
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* break locks and delay to ensure the write succeeds (but not sleep).
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*/
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static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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return mtd->panic_write(mtd, to, len, retlen, buf);
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}
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static inline struct mtd_info *dev_to_mtd(struct device *dev)
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{
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return dev ? dev_get_drvdata(dev) : NULL;
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