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uprobes: Introduce vaddr_to_offset(vma, vaddr)

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Add the new helper, vaddr_to_offset(vma, vaddr) which returns
the offset in vma->vm_file this vaddr is mapped at.

Change build_probe_list() and find_active_uprobe() to use the
new helper, the next patch adds another user.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182242.GA20355@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2012-07-29 20:22:42 +02:00 committed by Ingo Molnar
parent 891c397081
commit cb113b47d0
1 changed files with 8 additions and 6 deletions
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14
kernel/events/uprobes.c
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@ -122,6 +122,11 @@ static loff_t vma_address(struct vm_area_struct *vma, loff_t offset)
return vaddr;
}
static loff_t vaddr_to_offset(struct vm_area_struct *vma, unsigned long vaddr)
{
return ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + (vaddr - vma->vm_start);
}
/**
* __replace_page - replace page in vma by new page.
* based on replace_page in mm/ksm.c
@ -978,7 +983,7 @@ static void build_probe_list(struct inode *inode,
struct uprobe *u;
INIT_LIST_HEAD(head);
min = ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + start - vma->vm_start;
min = vaddr_to_offset(vma, start);
max = min + (end - start) - 1;
spin_lock_irqsave(&uprobes_treelock, flags);
@ -1442,12 +1447,9 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
vma = find_vma(mm, bp_vaddr);
if (vma && vma->vm_start <= bp_vaddr) {
if (valid_vma(vma, false)) {
struct inode *inode;
loff_t offset;
struct inode *inode = vma->vm_file->f_mapping->host;
loff_t offset = vaddr_to_offset(vma, bp_vaddr);
inode = vma->vm_file->f_mapping->host;
offset = bp_vaddr - vma->vm_start;
offset += (loff_t)vma->vm_pgoff << PAGE_SHIFT;
uprobe = find_uprobe(inode, offset);
}