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384f3ced07
This implements the code to store the actual filename found during a lookup in the dentry cache and to avoid multiple entries in the dcache pointing to the same inode. To avoid polluting the dcache, we implement a new directory inode operations for lookup. xfs_vn_ci_lookup() stores the correct case name in the dcache. The "actual name" is only allocated and returned for a case- insensitive match and not an actual match. Another unusual interaction with the dcache is not storing negative dentries like other filesystems doing a d_add(dentry, NULL) when an ENOENT is returned. During the VFS lookup, if a dentry returned has no inode, dput is called and ENOENT is returned. By not doing a d_add, this actually removes it completely from the dcache to be reused. create/rename have to be modified to support unhashed dentries being passed in. SGI-PV: 981521 SGI-Modid: xfs-linux-melb:xfs-kern:31208a Signed-off-by: Barry Naujok <bnaujok@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
42 lines
1.5 KiB
C
42 lines
1.5 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_IOPS_H__
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#define __XFS_IOPS_H__
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extern const struct inode_operations xfs_inode_operations;
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extern const struct inode_operations xfs_dir_inode_operations;
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extern const struct inode_operations xfs_dir_ci_inode_operations;
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extern const struct inode_operations xfs_symlink_inode_operations;
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extern const struct file_operations xfs_file_operations;
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extern const struct file_operations xfs_dir_file_operations;
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extern const struct file_operations xfs_invis_file_operations;
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struct xfs_inode;
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extern void xfs_ichgtime(struct xfs_inode *, int);
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extern void xfs_ichgtime_fast(struct xfs_inode *, struct inode *, int);
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#define xfs_vtoi(vp) \
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((struct xfs_inode *)vn_to_inode(vp)->i_private)
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#define XFS_I(inode) \
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((struct xfs_inode *)(inode)->i_private)
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#endif /* __XFS_IOPS_H__ */
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