b5ce1d83a6
We mostly need it to protect cached user permissions. The c_flags field is advisory, reading the wrong value is harmless and in the worst case we hit a slow path where we have to make an extra upcall to the userspace cache manager when revalidating a dentry or inode. Signed-off-by: Yoshihisa Abe <yoshiabe@cs.cmu.edu> Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/*
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* coda_fs_i.h
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*
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* Copyright (C) 1998 Carnegie Mellon University
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*
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*/
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#ifndef _LINUX_CODA_FS_I
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#define _LINUX_CODA_FS_I
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/coda.h>
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/*
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* coda fs inode data
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* c_lock protects accesses to c_flags, c_mapcount, c_cached_epoch, c_uid and
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* c_cached_perm.
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* vfs_inode is set only when the inode is created and never changes.
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* c_fid is set when the inode is created and should be considered immutable.
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*/
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struct coda_inode_info {
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struct CodaFid c_fid; /* Coda identifier */
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u_short c_flags; /* flags (see below) */
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unsigned int c_mapcount; /* nr of times this inode is mapped */
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unsigned int c_cached_epoch; /* epoch for cached permissions */
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vuid_t c_uid; /* fsuid for cached permissions */
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unsigned int c_cached_perm; /* cached access permissions */
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spinlock_t c_lock;
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struct inode vfs_inode;
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};
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/*
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* coda fs file private data
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*/
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#define CODA_MAGIC 0xC0DAC0DA
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struct coda_file_info {
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int cfi_magic; /* magic number */
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struct file *cfi_container; /* container file for this cnode */
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unsigned int cfi_mapcount; /* nr of times this file is mapped */
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};
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#define CODA_FTOC(file) ((struct coda_file_info *)((file)->private_data))
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/* flags */
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#define C_VATTR 0x1 /* Validity of vattr in inode */
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#define C_FLUSH 0x2 /* used after a flush */
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#define C_DYING 0x4 /* from venus (which died) */
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#define C_PURGE 0x8
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int coda_cnode_make(struct inode **, struct CodaFid *, struct super_block *);
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struct inode *coda_iget(struct super_block *sb, struct CodaFid *fid, struct coda_vattr *attr);
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int coda_cnode_makectl(struct inode **inode, struct super_block *sb);
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struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb);
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void coda_replace_fid(struct inode *, struct CodaFid *, struct CodaFid *);
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#endif
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