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fs: remove INODE_IS_SPECIAL() use others instead

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Change-Id: I949f1ad012836e6cb233d5362fe2542732b5ecf4
Signed-off-by: ligd <liguiding1@xiaomi.com>
This commit is contained in:
ligd 2020-12-24 22:53:32 +08:00 committed by Xiang Xiao
parent f5b59e287a
commit 3386941a10
4 changed files with 162 additions and 178 deletions
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2
fs/mount/fs_mount.c
View File

@ -356,7 +356,7 @@ int nx_mount(FAR const char *source, FAR const char *target,
* node)?
*/
if (INODE_IS_SPECIAL(mountpt_inode))
if (!INODE_IS_PSEUDODIR(mountpt_inode))
{
ferr("ERROR: target %s exists and is a special node\n", target);
ret = -ENOTDIR;

179
fs/vfs/fs_stat.c
View File

@ -259,115 +259,110 @@ int inode_stat(FAR struct inode *inode, FAR struct stat *buf, int resolve)
/* Handle "special" nodes */
if (INODE_IS_SPECIAL(inode))
{
#if defined(CONFIG_FS_NAMED_SEMAPHORES)
/* Check for a named semaphore */
/* Check for a named semaphore */
if (INODE_IS_NAMEDSEM(inode))
{
buf->st_mode = S_IFSEM;
}
else
if (INODE_IS_NAMEDSEM(inode))
{
buf->st_mode = S_IFSEM;
}
else
#endif
#if !defined(CONFIG_DISABLE_MQUEUE)
/* Check for a message queue */
/* Check for a message queue */
if (INODE_IS_MQUEUE(inode))
{
buf->st_mode = S_IFMQ;
}
else
if (INODE_IS_MQUEUE(inode))
{
buf->st_mode = S_IFMQ;
}
else
#endif
#if defined(CONFIG_FS_SHM)
/* Check for shared memory */
/* Check for shared memory */
if (INODE_IS_SHM(inode))
{
buf->st_mode = S_IFSHM;
}
else
if (INODE_IS_SHM(inode))
{
buf->st_mode = S_IFSHM;
}
else
#endif
#if defined(CONFIG_MTD)
/* Check for an MTD driver */
/* Check for an MTD driver */
if (INODE_IS_MTD(inode))
{
struct mtd_geometry_s mtdgeo;
buf->st_mode = S_IFMTD;
buf->st_mode |= S_IROTH | S_IRGRP | S_IRUSR;
buf->st_mode |= S_IWOTH | S_IWGRP | S_IWUSR;
if (inode->u.i_mtd != NULL &&
MTD_IOCTL(inode->u.i_mtd, MTDIOC_GEOMETRY,
(unsigned long)((uintptr_t)&mtdgeo)) >= 0)
{
buf->st_size = mtdgeo.neraseblocks * mtdgeo.erasesize;
}
}
else
#endif
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
/* Handle softlinks differently. Just call stat() recursively on the
* target of the softlink.
*
* REVISIT: This has the possibility of an infinite loop!
*/
if (INODE_IS_SOFTLINK(inode))
{
if (resolve)
{
int ret;
/* Increment the link counter. This is necessary to avoid
* infinite recursion if loops are encountered in the
* traversal. If we encounter more SYMLOOP_MAX symbolic links
* at any time during the traversal, error out.
*
* NOTE: That inode_search() will automatically skip over
* consecutive, intermediate symbolic links. Those numbers
* will not be included in the total.
*/
if (++buf->st_count > SYMLOOP_MAX)
{
return -ELOOP;
}
DEBUGASSERT(buf->st_count > 0); /* Check for unsigned integer overflow */
/* stat() the target of the soft link. */
ret = stat_recursive(inode->u.i_link, buf, 1);
/* If stat() fails, then there is a problem with the target of
* the symbolic link, but not with the symbolic link itself.
* We should still report success, just with less information.
*/
if (ret < 0)
{
RESET_BUF(buf);
}
}
else
{
/* Make sure the caller knows that this is a symbolic link. */
buf->st_mode = S_IRWXO | S_IRWXG | S_IRWXU | S_IFLNK;
}
}
else
#endif
if (INODE_IS_MTD(inode))
{
struct mtd_geometry_s mtdgeo;
buf->st_mode = S_IFMTD;
buf->st_mode |= S_IROTH | S_IRGRP | S_IRUSR;
buf->st_mode |= S_IWOTH | S_IWGRP | S_IWUSR;
if (inode->u.i_mtd != NULL &&
MTD_IOCTL(inode->u.i_mtd, MTDIOC_GEOMETRY,
(unsigned long)((uintptr_t)&mtdgeo)) >= 0)
{
buf->st_size = mtdgeo.neraseblocks * mtdgeo.erasesize;
}
}
else
#endif
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
/* Handle softlinks differently. Just call stat() recursively on the
* target of the softlink.
*
* REVISIT: This has the possibility of an infinite loop!
*/
if (INODE_IS_SOFTLINK(inode))
{
if (resolve)
{
int ret;
/* Increment the link counter. This is necessary to avoid
* infinite recursion if loops are encountered in the
* traversal. If we encounter more SYMLOOP_MAX symbolic links
* at any time during the traversal, error out.
*
* NOTE: That inode_search() will automatically skip over
* consecutive, intermediate symbolic links. Those numbers
* will not be included in the total.
*/
if (++buf->st_count > SYMLOOP_MAX)
{
return -ELOOP;
}
DEBUGASSERT(buf->st_count > 0); /* Check for unsigned integer overflow */
/* stat() the target of the soft link. */
ret = stat_recursive(inode->u.i_link, buf, 1);
/* If stat() fails, then there is a problem with the target of
* the symbolic link, but not with the symbolic link itself.
* We should still report success, just with less information.
*/
if (ret < 0)
{
RESET_BUF(buf);
}
}
else
{
/* Make sure the caller knows that this is a symbolic link. */
buf->st_mode = S_IRWXO | S_IRWXG | S_IRWXU | S_IFLNK;
}
}
else
#endif
/* Handle "normal inodes */
else if (inode->u.i_ops != NULL)
if (inode->u.i_ops != NULL)
{
/* Determine read/write privileges based on the existence of read
* and write methods.

134
fs/vfs/fs_unlink.c
View File

@ -106,96 +106,83 @@ int nx_unlink(FAR const char *pathname)
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If this is a "dangling" pseudo-file node (i.e., it has no operations)
* or a soft link, then rm should remove the node.
*/
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
/* A soft link is the only "specal" file that we can remove via unlink(). */
if (!INODE_IS_SPECIAL(inode) || INODE_IS_SOFTLINK(inode))
#else
if (!INODE_IS_SPECIAL(inode))
#endif
{
/* If this is a pseudo-file node (i.e., it has no operations)
* then unlink should remove the node.
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
ret = inode_semtake();
if (ret < 0)
{
goto errout_with_inode;
}
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->u.i_ops != NULL)
if (inode->i_child != NULL)
{
ret = inode_semtake();
ret = -ENOTEMPTY;
goto errout_with_sem;
}
/* Notify the driver that it has been unlinked. If there are no
* open references to the driver instance, then the driver should
* release all resources because it is no longer accessible.
*/
if (INODE_IS_DRIVER(inode) && inode->u.i_ops->unlink)
{
/* Notify the character driver that it has been unlinked */
ret = inode->u.i_ops->unlink(inode);
if (ret < 0)
{
goto errout_with_inode;
}
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->i_child != NULL)
{
ret = -ENOTEMPTY;
inode_semgive();
goto errout_with_inode;
}
/* Notify the driver that it has been unlinked. If there are no
* open references to the driver instance, then the driver should
* release all resources because it is no longer accessible.
*/
if (INODE_IS_DRIVER(inode) && inode->u.i_ops->unlink)
{
/* Notify the character driver that it has been unlinked */
ret = inode->u.i_ops->unlink(inode);
if (ret < 0)
{
goto errout_with_inode;
}
goto errout_with_sem;
}
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
else if (INODE_IS_BLOCK(inode) && inode->u.i_bops->unlink)
{
/* Notify the block driver that it has been unlinked */
else if (INODE_IS_BLOCK(inode) && inode->u.i_bops->unlink)
{
/* Notify the block driver that it has been unlinked */
ret = inode->u.i_bops->unlink(inode);
if (ret < 0)
{
goto errout_with_inode;
}
ret = inode->u.i_bops->unlink(inode);
if (ret < 0)
{
goto errout_with_sem;
}
}
#endif
/* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all
* of the references to the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
else if (INODE_IS_PSEUDODIR(inode) || INODE_IS_SOFTLINK(inode))
#else
else if (INODE_IS_PSEUDODIR(inode))
#endif
{
/* If this is a "dangling" pseudo-file node
* (i.e., it has no operations) or a soft link,
* then rm should remove the node.
*/
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
goto errout_with_inode;
}
}
else
{
ret = -EISDIR;
ret = -ENXIO;
goto errout_with_sem;
}
/* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all
* of the references to the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
goto errout_with_inode;
}
}
else
#endif
{
ret = -ENXIO;
goto errout_with_inode;
}
/* Successfully unlinked */
@ -204,6 +191,9 @@ int nx_unlink(FAR const char *pathname)
RELEASE_SEARCH(&desc);
return OK;
errout_with_sem:
inode_semgive();
errout_with_inode:
inode_release(inode);

25
include/nuttx/fs/fs.h
View File

@ -108,23 +108,22 @@
* Bit 4: Set if inode has been unlinked and is pending removal.
*/
#define FSNODEFLAG_TYPE_MASK 0x0000000f /* 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_SPECIAL 0x00000008 /* Special OS type */
#define FSNODEFLAG_TYPE_NAMEDSEM 0x00000008 /* Named semaphore */
#define FSNODEFLAG_TYPE_MQUEUE 0x00000009 /* Message Queue */
#define FSNODEFLAG_TYPE_SHM 0x0000000a /* Shared memory region */
#define FSNODEFLAG_TYPE_MTD 0x0000000b /* Named MTD driver */
#define FSNODEFLAG_TYPE_SOFTLINK 0x0000000c /* Soft link */
#define FSNODEFLAG_DELETED 0x00000010 /* Unlinked */
#define FSNODEFLAG_TYPE_MASK 0x0000000f /* Isolates type field */
#define FSNODEFLAG_TYPE_PSEUDODIR 0x00000000 /* Pseudo dir (default) */
#define FSNODEFLAG_TYPE_DRIVER 0x00000001 /* Character driver */
#define FSNODEFLAG_TYPE_BLOCK 0x00000002 /* Block driver */
#define FSNODEFLAG_TYPE_MOUNTPT 0x00000003 /* Mount point */
#define FSNODEFLAG_TYPE_NAMEDSEM 0x00000004 /* Named semaphore */
#define FSNODEFLAG_TYPE_MQUEUE 0x00000005 /* Message Queue */
#define FSNODEFLAG_TYPE_SHM 0x00000006 /* Shared memory region */
#define FSNODEFLAG_TYPE_MTD 0x00000007 /* Named MTD driver */
#define FSNODEFLAG_TYPE_SOFTLINK 0x00000008 /* Soft link */
#define FSNODEFLAG_DELETED 0x00000010 /* Unlinked */
#define INODE_IS_TYPE(i,t) \
(((i)->i_flags & FSNODEFLAG_TYPE_MASK) == (t))
#define INODE_IS_SPECIAL(i) \
(((i)->i_flags & FSNODEFLAG_TYPE_SPECIAL) != 0)
#define INODE_IS_PSEUDODIR(i) INODE_IS_TYPE(i,FSNODEFLAG_TYPE_PSEUDODIR)
#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)