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Soft links: Initial, incompete implementation

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Gregory Nutt
2017-02-02 10:39:41 -06:00
parent 74189d84e2
commit 92305e400a
7 changed files with 239 additions and 13 deletions
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include/nuttx/fs/fs.h
+18 -7
View File
@@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/fs/fs.h
*
* Copyright (C) 2007-2009, 2011-2013, 2015-2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011-2013, 2015-2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -66,12 +66,17 @@
#define __FS_FLAG_EOF (1 << 0) /* EOF detected by a read operation */
#define __FS_FLAG_ERROR (1 << 1) /* Error detected by any operation */
/* Inode i_flag values */
/* Inode i_flag values:
*
* Bit 0-3: Inode type (Bit 4 indicates internal OS types)
* Bit 4: Set if inode has been unlinked and is pending removal.
*/
#define FSNODEFLAG_TYPE_MASK 0x00000007 /* Isolates type field */
#define FSNODEFLAG_TYPE_DRIVER 0x00000000 /* Character driver */
#define FSNODEFLAG_TYPE_BLOCK 0x00000001 /* Block driver */
#define FSNODEFLAG_TYPE_MOUNTPT 0x00000002 /* Mount point */
#define FSNODEFLAG_TYPE_SOFTLINK 0x00000003 /* Soft link */
#define FSNODEFLAG_TYPE_SPECIAL 0x00000004 /* Special OS type */
#define FSNODEFLAG_TYPE_NAMEDSEM 0x00000004 /* Named semaphore */
#define FSNODEFLAG_TYPE_MQUEUE 0x00000005 /* Message Queue */
@@ -86,6 +91,7 @@
#define INODE_IS_DRIVER(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_DRIVER)
#define INODE_IS_BLOCK(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_BLOCK)
#define INODE_IS_MOUNTPT(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_MOUNTPT)
#define INODE_IS_SOFTLINK(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_SOFTLINK)
#define INODE_IS_NAMEDSEM(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_NAMEDSEM)
#define INODE_IS_MQUEUE(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_MQUEUE)
#define INODE_IS_SHM(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_SHM)
@@ -101,6 +107,7 @@
#define INODE_SET_DRIVER(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_DRIVER)
#define INODE_SET_BLOCK(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_BLOCK)
#define INODE_SET_MOUNTPT(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_MOUNTPT)
#define (i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_SOFTLINK)
#define INODE_SET_NAMEDSEM(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_NAMEDSEM)
#define INODE_SET_MQUEUE(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_MQUEUE)
#define INODE_SET_SHM(i) INODE_SET_TYPE(i,FSNODEFLAG_TYPE_SHM)
@@ -309,16 +316,19 @@ struct mountpt_operations
union inode_ops_u
{
FAR const struct file_operations *i_ops; /* Driver operations for inode */
FAR const struct file_operations *i_ops; /* Driver operations for inode */
#ifndef CONFIG_DISABLE_MOUNTPOINT
FAR const struct block_operations *i_bops; /* Block driver operations */
FAR const struct mountpt_operations *i_mops; /* Operations on a mountpoint */
FAR const struct block_operations *i_bops; /* Block driver operations */
FAR const struct mountpt_operations *i_mops; /* Operations on a mountpoint */
#endif
#ifdef CONFIG_FS_NAMED_SEMAPHORES
FAR struct nsem_inode_s *i_nsem; /* Named semaphore */
FAR struct nsem_inode_s *i_nsem; /* Named semaphore */
#endif
#ifndef CONFIG_DISABLE_MQUEUE
FAR struct mqueue_inode_s *i_mqueue; /* POSIX message queue */
FAR struct mqueue_inode_s *i_mqueue; /* POSIX message queue */
#endif
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
FAR char *i_link; /* Full path to link */
#endif
};
@@ -337,6 +347,7 @@ struct inode
FAR void *i_private; /* Per inode driver private data */
char i_name[1]; /* Name of inode (variable) */
};
#define FSNODE_SIZE(n) (sizeof(struct inode) + (n))
/* This is the underlying representation of an open file. A file
include/unistd.h
+2 -1
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@@ -1,7 +1,7 @@
/****************************************************************************
* include/unistd.h
*
* Copyright (C) 2007-2009, 2013-2014, 2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2013-2014, 2016-2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -190,6 +190,7 @@ FAR char *getcwd(FAR char *buf, size_t size);
int access(FAR const char *path, int amode);
int rmdir(FAR const char *pathname);
int unlink(FAR const char *pathname);
int link(FAR const char *path1, FAR const char *path2);
/* Execution of programs from files */