Provide the unique implementation for the VOP_GETPAGES() method used
by ffs and ext2fs. Remove duplicated call to vm_page_zero_invalid(), done by VOP and by vm_pager_getpages(). Use vm_pager_free_nonreq(). Reviewed by: alc (previous version) Sponsored by: The FreeBSD Foundation MFC after: 6 weeks (after r271596)
This commit is contained in:
parent
4c1d902bb2
commit
d15b55c554
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=271619
@ -97,7 +97,6 @@ static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
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static vop_close_t ext2_close;
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static vop_create_t ext2_create;
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static vop_fsync_t ext2_fsync;
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static vop_getpages_t ext2_getpages;
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static vop_getattr_t ext2_getattr;
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static vop_ioctl_t ext2_ioctl;
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static vop_link_t ext2_link;
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@ -128,7 +127,7 @@ struct vop_vector ext2_vnodeops = {
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.vop_close = ext2_close,
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.vop_create = ext2_create,
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.vop_fsync = ext2_fsync,
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.vop_getpages = ext2_getpages,
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.vop_getpages = vnode_pager_local_getpages,
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.vop_getattr = ext2_getattr,
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.vop_inactive = ext2_inactive,
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.vop_ioctl = ext2_ioctl,
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@ -2063,48 +2062,3 @@ ext2_write(struct vop_write_args *ap)
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}
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return (error);
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}
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/*
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* get page routine
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*/
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static int
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ext2_getpages(struct vop_getpages_args *ap)
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{
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int i;
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vm_page_t mreq;
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int pcount;
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mreq = ap->a_m[ap->a_reqpage];
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/*
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* Since the caller has busied the requested page, that page's valid
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* field will not be changed by other threads.
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*/
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vm_page_assert_xbusied(mreq);
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/*
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* if ANY DEV_BSIZE blocks are valid on a large filesystem block,
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* then the entire page is valid. Since the page may be mapped,
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* user programs might reference data beyond the actual end of file
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* occuring within the page. We have to zero that data.
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*/
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if (mreq->valid) {
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VM_OBJECT_WLOCK(mreq->object);
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if (mreq->valid != VM_PAGE_BITS_ALL)
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vm_page_zero_invalid(mreq, TRUE);
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pcount = round_page(ap->a_count) / PAGE_SIZE;
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for (i = 0; i < pcount; i++) {
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if (i != ap->a_reqpage) {
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vm_page_lock(ap->a_m[i]);
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vm_page_free(ap->a_m[i]);
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vm_page_unlock(ap->a_m[i]);
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}
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}
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VM_OBJECT_WUNLOCK(mreq->object);
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return VM_PAGER_OK;
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}
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return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
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ap->a_count,
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ap->a_reqpage);
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}
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@ -104,7 +104,6 @@ extern int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone);
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#endif
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static vop_fsync_t ffs_fsync;
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static vop_lock1_t ffs_lock;
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static vop_getpages_t ffs_getpages;
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static vop_read_t ffs_read;
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static vop_write_t ffs_write;
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static int ffs_extread(struct vnode *vp, struct uio *uio, int ioflag);
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@ -124,7 +123,7 @@ static vop_vptofh_t ffs_vptofh;
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struct vop_vector ffs_vnodeops1 = {
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.vop_default = &ufs_vnodeops,
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.vop_fsync = ffs_fsync,
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.vop_getpages = ffs_getpages,
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.vop_getpages = vnode_pager_local_getpages,
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.vop_lock1 = ffs_lock,
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.vop_read = ffs_read,
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.vop_reallocblks = ffs_reallocblks,
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@ -143,7 +142,7 @@ struct vop_vector ffs_fifoops1 = {
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struct vop_vector ffs_vnodeops2 = {
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.vop_default = &ufs_vnodeops,
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.vop_fsync = ffs_fsync,
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.vop_getpages = ffs_getpages,
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.vop_getpages = vnode_pager_local_getpages,
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.vop_lock1 = ffs_lock,
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.vop_read = ffs_read,
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.vop_reallocblks = ffs_reallocblks,
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@ -846,53 +845,6 @@ ffs_write(ap)
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return (error);
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}
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/*
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* get page routine
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*/
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static int
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ffs_getpages(ap)
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struct vop_getpages_args *ap;
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{
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int i;
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vm_page_t mreq;
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int pcount;
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mreq = ap->a_m[ap->a_reqpage];
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/*
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* Since the caller has busied the requested page, that page's valid
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* field will not be changed by other threads.
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*/
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vm_page_assert_xbusied(mreq);
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/*
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* if ANY DEV_BSIZE blocks are valid on a large filesystem block,
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* then the entire page is valid. Since the page may be mapped,
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* user programs might reference data beyond the actual end of file
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* occuring within the page. We have to zero that data.
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*/
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if (mreq->valid) {
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VM_OBJECT_WLOCK(mreq->object);
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if (mreq->valid != VM_PAGE_BITS_ALL)
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vm_page_zero_invalid(mreq, TRUE);
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pcount = round_page(ap->a_count) / PAGE_SIZE;
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for (i = 0; i < pcount; i++) {
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if (i != ap->a_reqpage) {
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vm_page_lock(ap->a_m[i]);
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vm_page_free(ap->a_m[i]);
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vm_page_unlock(ap->a_m[i]);
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}
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}
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VM_OBJECT_WUNLOCK(mreq->object);
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return VM_PAGER_OK;
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}
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return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
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ap->a_count,
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ap->a_reqpage);
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}
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/*
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* Extended attribute area reading.
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*/
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@ -664,6 +664,39 @@ vnode_pager_getpages(vm_object_t object, vm_page_t *m, int count, int reqpage)
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return rtval;
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}
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/*
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* The implementation of VOP_GETPAGES() for local filesystems, where
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* partially valid pages can only occur at the end of file.
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*/
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int
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vnode_pager_local_getpages(struct vop_getpages_args *ap)
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{
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vm_page_t mreq;
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mreq = ap->a_m[ap->a_reqpage];
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/*
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* Since the caller has busied the requested page, that page's valid
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* field will not be changed by other threads.
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*/
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vm_page_assert_xbusied(mreq);
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/*
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* The requested page has valid blocks. Invalid part can only
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* exist at the end of file, and the page is made fully valid
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* by zeroing in vm_pager_getpages(). Free non-requested
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* pages, since no i/o is done to read its content.
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*/
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if (mreq->valid != 0) {
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vm_pager_free_nonreq(mreq->object, ap->a_m, ap->a_reqpage,
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round_page(ap->a_count) / PAGE_SIZE);
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return (VM_PAGER_OK);
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}
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return (vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
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ap->a_count, ap->a_reqpage));
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}
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/*
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* This is now called from local media FS's to operate against their
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* own vnodes if they fail to implement VOP_GETPAGES.
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@ -45,6 +45,8 @@ int vnode_pager_generic_getpages(struct vnode *vp, vm_page_t *m,
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int vnode_pager_generic_putpages(struct vnode *vp, vm_page_t *m,
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int count, boolean_t sync,
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int *rtvals);
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struct vop_getpages_args;
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int vnode_pager_local_getpages(struct vop_getpages_args *ap);
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void vnode_pager_release_writecount(vm_object_t object, vm_offset_t start,
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vm_offset_t end);
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