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readahead: fix NULL filp dereference

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btrfs relocate_file_extent_cluster() calls us with NULL filp:

  [ 4005.426805] BUG: unable to handle kernel NULL pointer dereference at 00000021
  [ 4005.426818] IP: [<c109a130>] page_cache_sync_readahead+0x18/0x3e

Signed-off-by: Wu Fengguang <[email protected]>
Cc: Yan Zheng <[email protected]>
Reported-by: Kirill A. Shutemov <[email protected]>
Tested-by: Kirill A. Shutemov <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wu Fengguang 2010-04-06 14:34:53 -07:00 • committed by Linus Torvalds
commit 70655c06bd
1 changed files with 1 additions and 1 deletions
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mm/readahead.c
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@ -503,7 +503,7 @@ void page_cache_sync_readahead(struct address_space *mapping,
return;
/* be dumb */
if (filp->f_mode & FMODE_RANDOM) {
if (filp && (filp->f_mode & FMODE_RANDOM)) {
force_page_cache_readahead(mapping, filp, offset, req_size);
return;
}