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block: read i_size with i_size_read()

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Convert direct reads of an inode's i_size to using i_size_read().

i_size_{read,write} use a seqcount to protect reads from accessing
incomple writes.  Concurrent i_size_write()s require mutual exclussion
to protect the seqcount that is used by i_size_{read,write}.  But
i_size_read() callers do not need to use additional locking.

Signed-off-by: Mike Snitzer <[email protected]>
Acked-by: NeilBrown <[email protected]>
Acked-by: Lars Ellenberg <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Mike Snitzer 2010-11-08 14:39:12 +01:00 • committed by Jens Axboe
commit 77304d2aba
5 changed files with 18 additions and 18 deletions
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2
drivers/block/drbd/drbd_int.h
View file

@ -1874,7 +1874,7 @@ static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev)
static inline sector_t drbd_get_capacity(struct block_device *bdev)
{
/* return bdev ? get_capacity(bdev->bd_disk) : 0; */
return bdev ? bdev->bd_inode->i_size >> 9 : 0;
return bdev ? i_size_read(bdev->bd_inode) >> 9 : 0;
}
/**

20
drivers/md/md.c
View file

@ -706,7 +706,7 @@ static struct mdk_personality *find_pers(int level, char *clevel)
/* return the offset of the super block in 512byte sectors */
static inline sector_t calc_dev_sboffset(struct block_device *bdev)
{
sector_t num_sectors = bdev->bd_inode->i_size / 512;
sector_t num_sectors = i_size_read(bdev->bd_inode) / 512;
return MD_NEW_SIZE_SECTORS(num_sectors);
}
@ -1386,7 +1386,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
*/
switch(minor_version) {
case 0:
sb_start = rdev->bdev->bd_inode->i_size >> 9;
sb_start = i_size_read(rdev->bdev->bd_inode) >> 9;
sb_start -= 8*2;
sb_start &= ~(sector_t)(4*2-1);
break;
@ -1472,7 +1472,7 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
ret = 0;
}
if (minor_version)
rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) -
rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
le64_to_cpu(sb->data_offset);
else
rdev->sectors = rdev->sb_start;
@ -1680,7 +1680,7 @@ super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
return 0; /* component must fit device */
if (rdev->sb_start < rdev->data_offset) {
/* minor versions 1 and 2; superblock before data */
max_sectors = rdev->bdev->bd_inode->i_size >> 9;
max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9;
max_sectors -= rdev->data_offset;
if (!num_sectors || num_sectors > max_sectors)
num_sectors = max_sectors;
@ -1690,7 +1690,7 @@ super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
} else {
/* minor version 0; superblock after data */
sector_t sb_start;
sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2;
sb_start &= ~(sector_t)(4*2 - 1);
max_sectors = rdev->sectors + sb_start - rdev->sb_start;
if (!num_sectors || num_sectors > max_sectors)
@ -2584,7 +2584,7 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
if (!sectors)
return -EBUSY;
} else if (!sectors)
sectors = (rdev->bdev->bd_inode->i_size >> 9) -
sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) -
rdev->data_offset;
}
if (sectors < my_mddev->dev_sectors)
@ -2797,7 +2797,7 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
kobject_init(&rdev->kobj, &rdev_ktype);
size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS;
if (!size) {
printk(KERN_WARNING
"md: %s has zero or unknown size, marking faulty!\n",
@ -5235,8 +5235,8 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
if (!mddev->persistent) {
printk(KERN_INFO "md: nonpersistent superblock ...\n");
rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
} else
rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
} else
rdev->sb_start = calc_dev_sboffset(rdev->bdev);
rdev->sectors = rdev->sb_start;
@ -5306,7 +5306,7 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
if (mddev->persistent)
rdev->sb_start = calc_dev_sboffset(rdev->bdev);
else
rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512;
rdev->sectors = rdev->sb_start;