[PATCH] md: endian annotation for v1 superblock access

Includes a couple of bugfixes found by sparse.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f7f1908..7daa7b1 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -974,12 +974,13 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
  * version 1 superblock
  */
 
-static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
+static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
 {
-       unsigned int disk_csum, csum;
+       __le32 disk_csum;
+       u32 csum;
        unsigned long long newcsum;
        int size = 256 + le32_to_cpu(sb->max_dev)*2;
-       unsigned int *isuper = (unsigned int*)sb;
+       __le32 *isuper = (__le32*)sb;
        int i;
 
        disk_csum = sb->sb_csum;
@@ -989,7 +990,7 @@ static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
                newcsum += le32_to_cpu(*isuper++);
 
        if (size == 2)
-               newcsum += le16_to_cpu(*(unsigned short*) isuper);
+               newcsum += le16_to_cpu(*(__le16*) isuper);
 
        csum = (newcsum & 0xffffffff) + (newcsum >> 32);
        sb->sb_csum = disk_csum;
@@ -1106,7 +1107,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
        if (le32_to_cpu(sb->chunksize))
                rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
 
-       if (le32_to_cpu(sb->size) > rdev->size*2)
+       if (le64_to_cpu(sb->size) > rdev->size*2)
                return -EINVAL;
        return ret;
 }
@@ -1228,7 +1229,7 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
        else
                sb->resync_offset = cpu_to_le64(0);
 
-       sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
+       sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
 
        sb->raid_disks = cpu_to_le32(mddev->raid_disks);
        sb->size = cpu_to_le64(mddev->size<<1);

diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h
index b6ebc69..3f2cd98 100644 (file)
--- a/include/linux/raid/md_p.h
+++ b/include/linux/raid/md_p.h
@@ -206,52 +206,52 @@ static inline __u64 md_event(mdp_super_t *sb) {
  */
 struct mdp_superblock_1 {
        /* constant array information - 128 bytes */
-       __u32   magic;          /* MD_SB_MAGIC: 0xa92b4efc - little endian */
-       __u32   major_version;  /* 1 */
-       __u32   feature_map;    /* bit 0 set if 'bitmap_offset' is meaningful */
-       __u32   pad0;           /* always set to 0 when writing */
+       __le32  magic;          /* MD_SB_MAGIC: 0xa92b4efc - little endian */
+       __le32  major_version;  /* 1 */
+       __le32  feature_map;    /* bit 0 set if 'bitmap_offset' is meaningful */
+       __le32  pad0;           /* always set to 0 when writing */
 
        __u8    set_uuid[16];   /* user-space generated. */
        char    set_name[32];   /* set and interpreted by user-space */
 
-       __u64   ctime;          /* lo 40 bits are seconds, top 24 are microseconds or 0*/
-       __u32   level;          /* -4 (multipath), -1 (linear), 0,1,4,5 */
-       __u32   layout;         /* only for raid5 and raid10 currently */
-       __u64   size;           /* used size of component devices, in 512byte sectors */
+       __le64  ctime;          /* lo 40 bits are seconds, top 24 are microseconds or 0*/
+       __le32  level;          /* -4 (multipath), -1 (linear), 0,1,4,5 */
+       __le32  layout;         /* only for raid5 and raid10 currently */
+       __le64  size;           /* used size of component devices, in 512byte sectors */
 
-       __u32   chunksize;      /* in 512byte sectors */
-       __u32   raid_disks;
-       __u32   bitmap_offset;  /* sectors after start of superblock that bitmap starts
+       __le32  chunksize;      /* in 512byte sectors */
+       __le32  raid_disks;
+       __le32  bitmap_offset;  /* sectors after start of superblock that bitmap starts
                                 * NOTE: signed, so bitmap can be before superblock
                                 * only meaningful of feature_map[0] is set.
                                 */
 
        /* These are only valid with feature bit '4' */
-       __u32   new_level;      /* new level we are reshaping to                */
-       __u64   reshape_position;       /* next address in array-space for reshape */
-       __u32   delta_disks;    /* change in number of raid_disks               */
-       __u32   new_layout;     /* new layout                                   */
-       __u32   new_chunk;      /* new chunk size (bytes)                       */
+       __le32  new_level;      /* new level we are reshaping to                */
+       __le64  reshape_position;       /* next address in array-space for reshape */
+       __le32  delta_disks;    /* change in number of raid_disks               */
+       __le32  new_layout;     /* new layout                                   */
+       __le32  new_chunk;      /* new chunk size (bytes)                       */
        __u8    pad1[128-124];  /* set to 0 when written */
 
        /* constant this-device information - 64 bytes */
-       __u64   data_offset;    /* sector start of data, often 0 */
-       __u64   data_size;      /* sectors in this device that can be used for data */
-       __u64   super_offset;   /* sector start of this superblock */
-       __u64   recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
-       __u32   dev_number;     /* permanent identifier of this  device - not role in raid */
-       __u32   cnt_corrected_read; /* number of read errors that were corrected by re-writing */
+       __le64  data_offset;    /* sector start of data, often 0 */
+       __le64  data_size;      /* sectors in this device that can be used for data */
+       __le64  super_offset;   /* sector start of this superblock */
+       __le64  recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
+       __le32  dev_number;     /* permanent identifier of this  device - not role in raid */
+       __le32  cnt_corrected_read; /* number of read errors that were corrected by re-writing */
        __u8    device_uuid[16]; /* user-space setable, ignored by kernel */
        __u8    devflags;       /* per-device flags.  Only one defined...*/
 #define        WriteMostly1    1       /* mask for writemostly flag in above */
        __u8    pad2[64-57];    /* set to 0 when writing */
 
        /* array state information - 64 bytes */
-       __u64   utime;          /* 40 bits second, 24 btes microseconds */
-       __u64   events;         /* incremented when superblock updated */
-       __u64   resync_offset;  /* data before this offset (from data_offset) known to be in sync */
-       __u32   sb_csum;        /* checksum upto devs[max_dev] */
-       __u32   max_dev;        /* size of devs[] array to consider */
+       __le64  utime;          /* 40 bits second, 24 btes microseconds */
+       __le64  events;         /* incremented when superblock updated */
+       __le64  resync_offset;  /* data before this offset (from data_offset) known to be in sync */
+       __le32  sb_csum;        /* checksum upto devs[max_dev] */
+       __le32  max_dev;        /* size of devs[] array to consider */
        __u8    pad3[64-32];    /* set to 0 when writing */
 
        /* device state information. Indexed by dev_number.
@@ -260,7 +260,7 @@ struct mdp_superblock_1 {
         * into the 'roles' value.  If a device is spare or faulty, then it doesn't
         * have a meaningful role.
         */
-       __u16   dev_roles[0];   /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
+       __le16  dev_roles[0];   /* role in array, or 0xffff for a spare, or 0xfffe for faulty */
 };
 
 /* feature_map bits */