Tweaks for the buffer pager.
Pass current thread credentials instead of NOCRED. Only allow unmapped buffers for filesystem which proclaimed the support. For all filesystems which currently use buffer pager (UFS, msdosfs and cd9660), the changes are effectively nop. Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week
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parent
328dd395ba
commit
9a639daf77
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=308442
@ -4686,13 +4686,15 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int count,
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vm_page_t m;
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vm_object_t object;
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struct buf *bp;
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struct mount *mp;
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daddr_t lbn, lbnp;
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vm_ooffset_t la, lb, poff, poffe;
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long bsize;
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int bo_bs, error, i;
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int bo_bs, br_flags, error, i;
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bool redo, lpart;
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object = vp->v_object;
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mp = vp->v_mount;
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la = IDX_TO_OFF(ma[count - 1]->pindex);
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if (la >= object->un_pager.vnp.vnp_size)
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return (VM_PAGER_BAD);
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@ -4709,6 +4711,8 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int count,
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vnp.vnp_size, PAGE_SIZE) - la);
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}
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}
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br_flags = (mp != NULL && (mp->mnt_kern_flag & MNTK_UNMAPPED_BUFS)
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!= 0) ? GB_UNMAPPED : 0;
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VM_OBJECT_WLOCK(object);
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again:
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for (i = 0; i < count; i++)
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@ -4741,8 +4745,8 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int count,
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lbnp = lbn;
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bsize = get_blksize(vp, lbn);
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error = bread_gb(vp, lbn, bsize, NOCRED, GB_UNMAPPED,
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&bp);
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error = bread_gb(vp, lbn, bsize, curthread->td_ucred,
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br_flags, &bp);
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if (error != 0)
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goto end_pages;
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if (LIST_EMPTY(&bp->b_dep)) {
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