diff options
Diffstat (limited to 'geometry-26kernel.patch')
| -rw-r--r-- | geometry-26kernel.patch | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/geometry-26kernel.patch b/geometry-26kernel.patch new file mode 100644 index 000000000000..91d85281887a --- /dev/null +++ b/geometry-26kernel.patch @@ -0,0 +1,236 @@ + + Date: 2005-11-11 + Author: Otavio Salvador + Comment: Stolen from Fedora grub package. + Put geometry discover inside of grub code since kernel 2.6 + doesn't do that anymore. + +Index: b/lib/device.c +=================================================================== +--- a/lib/device.c ++++ b/lib/device.c +@@ -131,6 +131,152 @@ + #include <shared.h> + #include <device.h> + ++#if defined(__linux__) ++/* The 2.6 kernel has removed all of the geometry handling for IDE drives ++ * that did fixups for LBA, etc. This means that the geometry we get ++ * with the ioctl has a good chance of being wrong. So, we get to ++ * also know about partition tables and try to read what the geometry ++ * is there. *grumble* Very closely based on code from cfdisk ++ */ ++static void get_kernel_geometry(int fd, long long *cyl, int *heads, int *sectors) { ++ struct hd_geometry hdg; ++ ++ if (ioctl (fd, HDIO_GETGEO, &hdg)) ++ return; ++ ++ *cyl = hdg.cylinders; ++ *heads = hdg.heads; ++ *sectors = hdg.sectors; ++} ++ ++struct partition { ++ unsigned char boot_ind; /* 0x80 - active */ ++ unsigned char head; /* starting head */ ++ unsigned char sector; /* starting sector */ ++ unsigned char cyl; /* starting cylinder */ ++ unsigned char sys_ind; /* What partition type */ ++ unsigned char end_head; /* end head */ ++ unsigned char end_sector; /* end sector */ ++ unsigned char end_cyl; /* end cylinder */ ++ unsigned char start4[4]; /* starting sector counting from 0 */ ++ unsigned char size4[4]; /* nr of sectors in partition */ ++}; ++ ++#define ALIGNMENT 2 ++typedef union { ++ struct { ++ unsigned char align[ALIGNMENT]; ++ unsigned char b[SECTOR_SIZE]; ++ } c; ++ struct { ++ unsigned char align[ALIGNMENT]; ++ unsigned char buffer[0x1BE]; ++ struct partition part[4]; ++ unsigned char magicflag[2]; ++ } p; ++} partition_table; ++ ++#define PART_TABLE_FLAG0 0x55 ++#define PART_TABLE_FLAG1 0xAA ++ ++static void ++get_partition_table_geometry(partition_table *bufp, long long *cyl, int *heads, ++ int *sectors) { ++ struct partition *p; ++ int i,h,s,hh,ss; ++ int first = 1; ++ int bad = 0; ++ ++ if (bufp->p.magicflag[0] != PART_TABLE_FLAG0 || ++ bufp->p.magicflag[1] != PART_TABLE_FLAG1) { ++ /* Matthew Wilcox: slightly friendlier version of ++ fatal(_("Bad signature on partition table"), 3); ++ */ ++ fprintf(stderr, "Unknown partition table signature\n"); ++ return; ++ } ++ ++ hh = ss = 0; ++ for (i=0; i<4; i++) { ++ p = &(bufp->p.part[i]); ++ if (p->sys_ind != 0) { ++ h = p->end_head + 1; ++ s = (p->end_sector & 077); ++ if (first) { ++ hh = h; ++ ss = s; ++ first = 0; ++ } else if (hh != h || ss != s) ++ bad = 1; ++ } ++ } ++ ++ if (!first && !bad) { ++ *heads = hh; ++ *sectors = ss; ++ } ++} ++ ++static long long my_lseek (unsigned int fd, long long offset, ++ unsigned int origin) ++{ ++#if defined(__linux__) && (!defined(__GLIBC__) || \ ++ ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))) ++ /* Maybe libc doesn't have large file support. */ ++ loff_t offset, result; ++ static int _llseek (uint filedes, ulong hi, ulong lo, ++ loff_t *res, uint wh); ++ _syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo, ++ loff_t *, res, uint, wh); ++ ++ if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET) < 0) ++ return (long long) -1; ++ return result; ++#else ++ return lseek(fd, offset, SEEK_SET); ++#endif ++} ++ ++static void get_linux_geometry (int fd, struct geometry *geom) { ++ long long kern_cyl = 0; int kern_head = 0, kern_sectors = 0; ++ long long pt_cyl = 0; int pt_head = 0, pt_sectors = 0; ++ partition_table bufp; ++ char *buff, *buf_unaligned; ++ ++ buf_unaligned = malloc(sizeof(partition_table) + 4095); ++ buff = (char *) (((unsigned long)buf_unaligned + 4096 - 1) & ++ (~(4096-1))); ++ ++ get_kernel_geometry(fd, &kern_cyl, &kern_head, &kern_sectors); ++ ++ if (my_lseek (fd, 0*SECTOR_SIZE, SEEK_SET) < 0) { ++ fprintf(stderr, "Unable to seek"); ++ } ++ ++ if (read(fd, buff, SECTOR_SIZE) == SECTOR_SIZE) { ++ memcpy(bufp.c.b, buff, SECTOR_SIZE); ++ get_partition_table_geometry(&bufp, &pt_cyl, &pt_head, &pt_sectors); ++ } else { ++ fprintf(stderr, "Unable to read partition table: %s\n", strerror(errno)); ++ } ++ ++ if (pt_head && pt_sectors) { ++ int cyl_size; ++ ++ geom->heads = pt_head; ++ geom->sectors = pt_sectors; ++ cyl_size = pt_head * pt_sectors; ++ geom->cylinders = geom->total_sectors/cyl_size; ++ } else { ++ geom->heads = kern_head; ++ geom->sectors = kern_sectors; ++ geom->cylinders = kern_cyl; ++ } ++ ++ return; ++} ++#endif ++ + /* Get the geometry of a drive DRIVE. */ + void + get_drive_geometry (struct geometry *geom, char **map, int drive) +@@ -151,19 +297,15 @@ + #if defined(__linux__) + /* Linux */ + { +- struct hd_geometry hdg; + unsigned long long nr; + +- if (ioctl (fd, HDIO_GETGEO, &hdg)) +- goto fail; +- + if (ioctl (fd, BLKGETSIZE64, &nr)) + goto fail; + + /* Got the geometry, so save it. */ +- geom->cylinders = hdg.cylinders; +- geom->heads = hdg.heads; +- geom->sectors = hdg.sectors; ++ get_linux_geometry(fd, geom); ++ if (!geom->heads && !geom->cylinders && !geom->sectors) ++ goto fail; + geom->total_sectors = nr / 512; + + goto success; +@@ -984,6 +1126,7 @@ + { + char dev[PATH_MAX]; /* XXX */ + int fd; ++ off_t offset = (off_t) sector * (off_t) SECTOR_SIZE; + + if ((partition & 0x00FF00) != 0x00FF00) + { +@@ -1018,35 +1161,13 @@ + errnum = ERR_NO_PART; + return 0; + } +- +-#if defined(__linux__) && (!defined(__GLIBC__) || \ +- ((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))) +- /* Maybe libc doesn't have large file support. */ +- { +- loff_t offset, result; +- static int _llseek (uint filedes, ulong hi, ulong lo, +- loff_t *res, uint wh); +- _syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo, +- loff_t *, res, uint, wh); + +- offset = (loff_t) sector * (loff_t) SECTOR_SIZE; +- if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET)) +- { +- errnum = ERR_DEV_VALUES; +- return 0; +- } +- } +-#else +- { +- off_t offset = (off_t) sector * (off_t) SECTOR_SIZE; + +- if (lseek (fd, offset, SEEK_SET) != offset) +- { +- errnum = ERR_DEV_VALUES; +- return 0; +- } +- } +-#endif ++ if (my_lseek(fd, offset, SEEK_SET) != offset) ++ { ++ errnum = ERR_DEV_VALUES; ++ return 0; ++ } + + if (write (fd, buf, size * SECTOR_SIZE) != (size * SECTOR_SIZE)) + { |