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Fix a potential page leak in mappedread_sf()

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mappedread_sf() may allocate pages; if it fails to populate a page
can't free it, it needs to ensure that it's placed into a page queue,
otherwise it can't be reclaimed until the vnode is destroyed.

I think this is quite unlikely to happen in practice, it was noticed by
code inspection.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes #16643
This commit is contained in:
Mark Johnston 2024-10-13 16:13:26 +00:00 committed by Brian Behlendorf
parent 1c9a4c8cb4
commit 25eb538778
1 changed files with 3 additions and 1 deletions
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4
module/os/freebsd/zfs/zfs_vnops_os.c
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@ -452,8 +452,10 @@ mappedread_sf(znode_t *zp, int nbytes, zfs_uio_t *uio)
if (!vm_page_wired(pp) && pp->valid == 0 &&
vm_page_busy_tryupgrade(pp))
vm_page_free(pp);
else
else {
vm_page_deactivate_noreuse(pp);
vm_page_sunbusy(pp);
}
zfs_vmobject_wunlock(obj);
}
} else {