diff options
| -rw-r--r-- | drivers/mtd/mtdchar.c | 48 | ||||
| -rw-r--r-- | drivers/mtd/nand/davinci_nand.c | 3 | ||||
| -rw-r--r-- | include/linux/mtd/mtd.h | 15 | ||||
| -rw-r--r-- | include/linux/mtd/partitions.h | 2 | ||||
| -rw-r--r-- | include/mtd/mtd-abi.h | 4 | ||||
| -rw-r--r-- | include/mtd/mtd-user.h | 2 |
6 files changed, 67 insertions, 7 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index a825002..24d35ba 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -477,6 +477,39 @@ static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, return ret; } +/* + * Copies (and truncates, if necessary) data from the larger struct, + * nand_ecclayout, to the smaller, deprecated layout struct, + * nand_ecclayout_user. This is necessary only to suppport the deprecated + * API ioctl ECCGETLAYOUT while allowing all new functionality to use + * nand_ecclayout flexibly (i.e. the struct may change size in new + * releases without requiring major rewrites). + */ +static int shrink_ecclayout(const struct nand_ecclayout *from, + struct nand_ecclayout_user *to) +{ + int i; + + if (!from || !to) + return -EINVAL; + + memset(to, 0, sizeof(*to)); + + to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES_OLD); + for (i = 0; i < to->eccbytes; i++) + to->eccpos[i] = from->eccpos[i]; + + for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { + if (from->oobfree[i].length == 0 && + from->oobfree[i].offset == 0) + break; + to->oobavail += from->oobfree[i].length; + to->oobfree[i] = from->oobfree[i]; + } + + return 0; +} + static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) { struct mtd_file_info *mfi = file->private_data; @@ -812,14 +845,23 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) } #endif + /* This ioctl is being deprecated - it truncates the ecc layout */ case ECCGETLAYOUT: { + struct nand_ecclayout_user *usrlay; + if (!mtd->ecclayout) return -EOPNOTSUPP; - if (copy_to_user(argp, mtd->ecclayout, - sizeof(struct nand_ecclayout))) - return -EFAULT; + usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); + if (!usrlay) + return -ENOMEM; + + shrink_ecclayout(mtd->ecclayout, usrlay); + + if (copy_to_user(argp, usrlay, sizeof(*usrlay))) + ret = -EFAULT; + kfree(usrlay); break; } diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c index 2ac7367..70698e8 100644 --- a/drivers/mtd/nand/davinci_nand.c +++ b/drivers/mtd/nand/davinci_nand.c @@ -749,6 +749,9 @@ static int __init nand_davinci_probe(struct platform_device *pdev) * breaks userspace ioctl interface with mtd-utils. Once we * resolve this issue, NAND_ECC_HW_OOB_FIRST mode can be used * for the 4KiB page chips. + * + * TODO: Note that nand_ecclayout has now been expanded and can + * hold plenty of OOB entries. */ dev_warn(&pdev->dev, "no 4-bit ECC support yet " "for 4KiB-page NAND\n"); diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 8485e42..03a1e95 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -110,6 +110,21 @@ struct mtd_oob_ops { uint8_t *oobbuf; }; +#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32 +#define MTD_MAX_ECCPOS_ENTRIES_LARGE 448 +#define MTD_MAX_ECCPOS_ENTRIES_OLD 64 /* Previous maximum */ +/* + * Correct ECC layout control structure. This replaces old nand_ecclayout + * (mtd-abi.h) that is exported via ECCGETLAYOUT ioctl. It should be expandable + * in the future simply by the above macros. + */ +struct nand_ecclayout { + __u32 eccbytes; + __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE]; + __u32 oobavail; + struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE]; +}; + struct mtd_info { u_char type; uint32_t flags; diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h index 274b619..930c8ac 100644 --- a/include/linux/mtd/partitions.h +++ b/include/linux/mtd/partitions.h @@ -39,7 +39,7 @@ struct mtd_partition { uint64_t size; /* partition size */ uint64_t offset; /* offset within the master MTD space */ uint32_t mask_flags; /* master MTD flags to mask out for this partition */ - struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only)*/ + struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */ }; #define MTDPART_OFS_NXTBLK (-2) diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h index 4debb45..5bce083 100644 --- a/include/mtd/mtd-abi.h +++ b/include/mtd/mtd-abi.h @@ -119,7 +119,7 @@ struct otp_info { #define OTPGETREGIONCOUNT _IOW('M', 14, int) #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info) #define OTPLOCK _IOR('M', 16, struct otp_info) -#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout) +#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user) #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats) #define MTDFILEMODE _IO('M', 19) #define MEMERASE64 _IOW('M', 20, struct erase_info_user64) @@ -148,7 +148,7 @@ struct nand_oobfree { * ECC layout control structure. Exported to userspace for * diagnosis and to allow creation of raw images */ -struct nand_ecclayout { +struct nand_ecclayout_user { __u32 eccbytes; __u32 eccpos[64]; __u32 oobavail; diff --git a/include/mtd/mtd-user.h b/include/mtd/mtd-user.h index aa3c2f8..83327c8 100644 --- a/include/mtd/mtd-user.h +++ b/include/mtd/mtd-user.h @@ -29,6 +29,6 @@ typedef struct mtd_info_user mtd_info_t; typedef struct erase_info_user erase_info_t; typedef struct region_info_user region_info_t; typedef struct nand_oobinfo nand_oobinfo_t; -typedef struct nand_ecclayout nand_ecclayout_t; +typedef struct nand_ecclayout_user nand_ecclayout_t; #endif /* __MTD_USER_H__ */ |