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switch d_materialise_unique() users to d_splice_alias()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Al Viro
2014-10-12 22:24:21 -04:00
parent b5ae6b15bd
commit 41d28bca2d
11 changed files with 19 additions and 29 deletions
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23
Documentation/filesystems/nfs/Exporting
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@@ -72,24 +72,11 @@ c/ Helper routines to allocate anonymous dentries, and to help attach
DCACHE_DISCONNECTED) dentry is allocated and attached.
In the case of a directory, care is taken that only one dentry
can ever be attached.
d_splice_alias(inode, dentry) or d_materialise_unique(dentry, inode)
will introduce a new dentry into the tree; either the passed-in
dentry or a preexisting alias for the given inode (such as an
anonymous one created by d_obtain_alias), if appropriate. The two
functions differ in their handling of directories with preexisting
aliases:
d_splice_alias will use any existing IS_ROOT dentry, but it will
return -EIO rather than try to move a dentry with a different
parent. This is appropriate for local filesystems, which
should never see such an alias unless the filesystem is
corrupted somehow (for example, if two on-disk directory
entries refer to the same directory.)
d_materialise_unique will attempt to move any dentry. This is
appropriate for distributed filesystems, where finding a
directory other than where we last cached it may be a normal
consequence of concurrent operations on other hosts.
Both functions return NULL when the passed-in dentry is used,
following the calling convention of ->lookup.
d_splice_alias(inode, dentry) will introduce a new dentry into the tree;
either the passed-in dentry or a preexisting alias for the given inode
(such as an anonymous one created by d_obtain_alias), if appropriate.
It returns NULL when the passed-in dentry is used, following the calling
convention of ->lookup.
Filesystem Issues