d3fec424b2
This is an variation on the patch sent by Christoph Hellwig which kills file_count abuse by the Coda kernel module by moving the coda_flush functionality into coda_release. However part of reason we were using the coda_flush callback was to allow Coda to pass errors that occur during writeback from the userspace cache manager back to close(). As Al Viro explained on linux-fsdevel, it is impossible to guarantee that such errors can in fact be returned back to the caller. There are many cases where the last reference to a file is not released by the close system call and it is also impossible to pick some close as a 'last-close' and delay it until all other references have been destroyed. The CODA_STORE/CODA_RELEASE upcall combination is clearly a broken design, and it is better to remove it completely. Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@ftp.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
#ifndef __CODA_PSDEV_H
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#define __CODA_PSDEV_H
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#include <linux/magic.h>
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#define CODA_PSDEV_MAJOR 67
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#define MAX_CODADEVS 5 /* how many do we allow */
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struct kstatfs;
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/* communication pending/processing queues */
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struct venus_comm {
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u_long vc_seq;
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wait_queue_head_t vc_waitq; /* Venus wait queue */
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struct list_head vc_pending;
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struct list_head vc_processing;
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int vc_inuse;
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struct super_block *vc_sb;
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};
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static inline struct venus_comm *coda_vcp(struct super_block *sb)
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{
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return (struct venus_comm *)((sb)->s_fs_info);
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}
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/* upcalls */
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int venus_rootfid(struct super_block *sb, struct CodaFid *fidp);
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int venus_getattr(struct super_block *sb, struct CodaFid *fid,
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struct coda_vattr *attr);
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int venus_setattr(struct super_block *, struct CodaFid *, struct coda_vattr *);
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int venus_lookup(struct super_block *sb, struct CodaFid *fid,
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const char *name, int length, int *type,
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struct CodaFid *resfid);
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int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
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vuid_t uid);
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int venus_open(struct super_block *sb, struct CodaFid *fid, int flags,
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struct file **f);
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int venus_mkdir(struct super_block *sb, struct CodaFid *dirfid,
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const char *name, int length,
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struct CodaFid *newfid, struct coda_vattr *attrs);
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int venus_create(struct super_block *sb, struct CodaFid *dirfid,
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const char *name, int length, int excl, int mode,
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struct CodaFid *newfid, struct coda_vattr *attrs) ;
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int venus_rmdir(struct super_block *sb, struct CodaFid *dirfid,
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const char *name, int length);
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int venus_remove(struct super_block *sb, struct CodaFid *dirfid,
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const char *name, int length);
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int venus_readlink(struct super_block *sb, struct CodaFid *fid,
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char *buffer, int *length);
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int venus_rename(struct super_block *, struct CodaFid *new_fid,
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struct CodaFid *old_fid, size_t old_length,
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size_t new_length, const char *old_name,
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const char *new_name);
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int venus_link(struct super_block *sb, struct CodaFid *fid,
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struct CodaFid *dirfid, const char *name, int len );
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int venus_symlink(struct super_block *sb, struct CodaFid *fid,
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const char *name, int len, const char *symname, int symlen);
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int venus_access(struct super_block *sb, struct CodaFid *fid, int mask);
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int venus_pioctl(struct super_block *sb, struct CodaFid *fid,
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unsigned int cmd, struct PioctlData *data);
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int coda_downcall(int opcode, union outputArgs *out, struct super_block *sb);
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int venus_fsync(struct super_block *sb, struct CodaFid *fid);
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int venus_statfs(struct dentry *dentry, struct kstatfs *sfs);
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/* messages between coda filesystem in kernel and Venus */
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struct upc_req {
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struct list_head uc_chain;
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caddr_t uc_data;
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u_short uc_flags;
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u_short uc_inSize; /* Size is at most 5000 bytes */
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u_short uc_outSize;
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u_short uc_opcode; /* copied from data to save lookup */
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int uc_unique;
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wait_queue_head_t uc_sleep; /* process' wait queue */
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};
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#define REQ_ASYNC 0x1
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#define REQ_READ 0x2
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#define REQ_WRITE 0x4
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#define REQ_ABORT 0x8
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/*
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* Statistics
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*/
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extern struct venus_comm coda_comms[];
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#endif
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