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Quick fix for initialization of mnt_iosize_max. (This limit controls

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mainly clustering and read-ahead.)  Copy the initialization from ffs,
and also copy a couple of lines of ffs's nearby style for initialization
order and whitespace.

A correct fix would de-duplicate the initialization and fix bitrot in it
instead of adding another instance of the duplication.  Complications to
use the size preferred by the device have been reduced to hard-coding
slightly pessimal and/or inconsistent defaults, using large code that was
almost needed to support the complications.

For msdosfs, the result was that mnt_iosize_max was DFTLPHYS (64K) but is
now MAXPHYS (128K).
This commit is contained in:
Bruce Evans 2018-12-21 20:12:43 +00:00
parent 1f03d0bae1
commit 8ec22c4d65
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=342353
1 changed files with 5 additions and 2 deletions
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7
sys/fs/msdosfs/msdosfs_vfsops.c
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@ -418,9 +418,12 @@ mountmsdosfs(struct vnode *devvp, struct mount *mp)
return (error);
}
dev_ref(dev);
VOP_UNLOCK(devvp, 0);
bo = &devvp->v_bufobj;
VOP_UNLOCK(devvp, 0);
if (dev->si_iosize_max != 0)
mp->mnt_iosize_max = dev->si_iosize_max;
if (mp->mnt_iosize_max > MAXPHYS)
mp->mnt_iosize_max = MAXPHYS;
/*
* Read the boot sector of the filesystem, and then check the