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dax: change bdev_dax_supported() to support boolean returns 

The function return values are confusing with the way the function is
named. We expect a true or false return value but it actually returns
0/-errno.  This makes the code very confusing. Changing the return values
to return a bool where if DAX is supported then return true and no DAX
support returns false.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Jiang 2018-05-30 13:03:46 -07:00 committed by Darrick J. Wong
parent ba23cba9b3
commit 80660f2025
6 changed files with 22 additions and 24 deletions
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16
drivers/dax/super.c
View File

@ -80,9 +80,9 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
* This is a library function for filesystems to check if the block device
* can be mounted with dax option.
*
* Return: negative errno if unsupported, 0 if supported.
* Return: true if supported, false if unsupported
*/
int __bdev_dax_supported(struct block_device *bdev, int blocksize)
bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
{
struct dax_device *dax_dev;
pgoff_t pgoff;
@ -95,21 +95,21 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize)
if (blocksize != PAGE_SIZE) {
pr_debug("%s: error: unsupported blocksize for dax\n",
bdevname(bdev, buf));
return -EINVAL;
return false;
}
err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff);
if (err) {
pr_debug("%s: error: unaligned partition for dax\n",
bdevname(bdev, buf));
return err;
return false;
}
dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
if (!dax_dev) {
pr_debug("%s: error: device does not support dax\n",
bdevname(bdev, buf));
return -EOPNOTSUPP;
return false;
}
id = dax_read_lock();
@ -121,7 +121,7 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize)
if (len < 1) {
pr_debug("%s: error: dax access failed (%ld)\n",
bdevname(bdev, buf), len);
return len < 0 ? len : -EIO;
return false;
}
if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) {
@ -139,10 +139,10 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize)
} else {
pr_debug("%s: error: dax support not enabled\n",
bdevname(bdev, buf));
return -EOPNOTSUPP;
return false;
}
return 0;
return true;
}
EXPORT_SYMBOL_GPL(__bdev_dax_supported);
#endif

3
fs/ext2/super.c
View File

@ -961,8 +961,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
err = bdev_dax_supported(sb->s_bdev, blocksize);
if (err) {
if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
ext2_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
sbi->s_mount_opt &= ~EXT2_MOUNT_DAX;

3
fs/ext4/super.c
View File

@ -3732,8 +3732,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
" that may contain inline data");
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
}
err = bdev_dax_supported(sb->s_bdev, blocksize);
if (err) {
if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
ext4_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;

4
fs/xfs/xfs_ioctl.c
View File

@ -1103,8 +1103,8 @@ xfs_ioctl_setattr_dax_invalidate(
if (fa->fsx_xflags & FS_XFLAG_DAX) {
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
return -EINVAL;
if (bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)),
sb->s_blocksize) < 0)
if (!bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)),
sb->s_blocksize))
return -EINVAL;
}

12
fs/xfs/xfs_super.c
View File

@ -1701,17 +1701,17 @@ xfs_fs_fill_super(
sb->s_flags |= SB_I_VERSION;
if (mp->m_flags & XFS_MOUNT_DAX) {
int error2 = 0;
bool rtdev_is_dax = false, datadev_is_dax;
xfs_warn(mp,
"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
error = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
sb->s_blocksize);
datadev_is_dax = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
sb->s_blocksize);
if (mp->m_rtdev_targp)
error2 = bdev_dax_supported(mp->m_rtdev_targp->bt_bdev,
sb->s_blocksize);
if (error && error2) {
rtdev_is_dax = bdev_dax_supported(
mp->m_rtdev_targp->bt_bdev, sb->s_blocksize);
if (!rtdev_is_dax && !datadev_is_dax) {
xfs_alert(mp,
"DAX unsupported by block device. Turning off DAX.");
mp->m_flags &= ~XFS_MOUNT_DAX;

8
include/linux/dax.h
View File

@ -64,8 +64,8 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
struct writeback_control;
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
int __bdev_dax_supported(struct block_device *bdev, int blocksize);
static inline int bdev_dax_supported(struct block_device *bdev, int blocksize)
bool __bdev_dax_supported(struct block_device *bdev, int blocksize);
static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
{
return __bdev_dax_supported(bdev, blocksize);
}
@ -84,10 +84,10 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc);
#else
static inline int bdev_dax_supported(struct block_device *bdev,
static inline bool bdev_dax_supported(struct block_device *bdev,
int blocksize)
{
return -EOPNOTSUPP;
return false;
}
static inline struct dax_device *fs_dax_get_by_host(const char *host)