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Red Hat Bugzilla – Attachment 299221 Details for
Bug 433249
[EMC 4.7 bug] nfs_access_cache_shrinker() race with umount
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[patch]
Proposed patch
433249.rhel-4 (text/plain), 847 bytes, created by
Peter Staubach
on 2008-03-26 19:55:43 UTC
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Description:
Proposed patch
Filename:
MIME Type:
Creator:
Peter Staubach
Created:
2008-03-26 19:55:43 UTC
Size:
847 bytes
patch
obsolete
>--- linux-2.6.9/fs/nfs/dir.c.org >+++ linux-2.6.9/fs/nfs/dir.c >@@ -1825,13 +1825,19 @@ int nfs_access_cache_shrinker(int nr_to_ > spin_lock(&nfs_access_lru_lock); > restart: > list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) { >+ struct rw_semaphore *s_umount; > struct inode *inode; > > if (nr_to_scan-- == 0) > break; >+ s_umount = &nfsi->vfs_inode.i_sb->s_umount; >+ if (!down_read_trylock(s_umount)) >+ continue; > inode = igrab(&nfsi->vfs_inode); >- if (inode == NULL) >+ if (inode == NULL) { >+ up_read(s_umount); > continue; >+ } > spin_lock(&inode->i_lock); > if (list_empty(&nfsi->access_cache_entry_lru)) > goto remove_lru_entry; >@@ -1849,6 +1855,7 @@ remove_lru_entry: > } > spin_unlock(&inode->i_lock); > iput(inode); >+ up_read(s_umount); > goto restart; > } > spin_unlock(&nfs_access_lru_lock);
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