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16b1c1cd71
NFS optimizes away d_revalidates for last component of open. This means that open itself can find the dentry stale. This patch allows the filesystem to return EOPENSTALE and the VFS will retry the lookup on just the last component if possible. If the lookup was done using RCU mode, including the last component, then this is not possible since the parent dentry is lost. In this case fall back to non-RCU lookup. Currently this is not used since NFS will always leave RCU mode. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
#ifndef _LINUX_ERRNO_H
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#define _LINUX_ERRNO_H
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#include <asm/errno.h>
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#ifdef __KERNEL__
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/*
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* These should never be seen by user programs. To return one of ERESTART*
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* codes, signal_pending() MUST be set. Note that ptrace can observe these
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* at syscall exit tracing, but they will never be left for the debugged user
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* process to see.
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*/
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#define ERESTARTSYS 512
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#define ERESTARTNOINTR 513
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#define ERESTARTNOHAND 514 /* restart if no handler.. */
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#define ENOIOCTLCMD 515 /* No ioctl command */
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#define ERESTART_RESTARTBLOCK 516 /* restart by calling sys_restart_syscall */
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#define EPROBE_DEFER 517 /* Driver requests probe retry */
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#define EOPENSTALE 518 /* open found a stale dentry */
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/* Defined for the NFSv3 protocol */
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#define EBADHANDLE 521 /* Illegal NFS file handle */
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#define ENOTSYNC 522 /* Update synchronization mismatch */
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#define EBADCOOKIE 523 /* Cookie is stale */
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#define ENOTSUPP 524 /* Operation is not supported */
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#define ETOOSMALL 525 /* Buffer or request is too small */
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#define ESERVERFAULT 526 /* An untranslatable error occurred */
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#define EBADTYPE 527 /* Type not supported by server */
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#define EJUKEBOX 528 /* Request initiated, but will not complete before timeout */
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#define EIOCBQUEUED 529 /* iocb queued, will get completion event */
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#define EIOCBRETRY 530 /* iocb queued, will trigger a retry */
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#endif
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#endif
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