ef0a265086
* VFS and installed MFSes must be in sync before and after this change * Use struct stat from NetBSD. It requires adding new STAT, FSTAT and LSTAT syscalls. Libc modification is both backward and forward compatible. Also new struct stat uses modern field sizes to avoid ABI incompatibility, when we update uid_t, gid_t and company. Exceptions are ino_t and off_t in old libc (though paddings added).
166 lines
4 KiB
C
166 lines
4 KiB
C
/* This file contains file metadata retrieval and manipulation routines.
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*
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* The entry points into this file are:
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* get_mode return a file's mode
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* do_stat perform the STAT file system call
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* do_chmod perform the CHMOD file system call
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* do_utime perform the UTIME file system call
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*
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* Created:
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* April 2009 (D.C. van Moolenbroek)
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*/
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#include "inc.h"
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/*===========================================================================*
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* get_mode *
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*===========================================================================*/
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PUBLIC mode_t get_mode(ino, mode)
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struct inode *ino;
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int mode;
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{
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/* Return the mode for an inode, given the inode and the HGFS retrieved mode.
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*/
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mode &= S_IRWXU;
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mode = mode | (mode >> 3) | (mode >> 6);
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if (IS_DIR(ino))
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mode = S_IFDIR | (mode & opt.dir_mask);
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else
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mode = S_IFREG | (mode & opt.file_mask);
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if (state.read_only)
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mode &= ~0222;
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return mode;
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}
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/*===========================================================================*
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* do_stat *
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*===========================================================================*/
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PUBLIC int do_stat()
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{
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/* Retrieve inode status.
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*/
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struct inode *ino;
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struct hgfs_attr attr;
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struct stat stat;
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char path[PATH_MAX];
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ino_t ino_nr;
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int r;
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ino_nr = m_in.REQ_INODE_NR;
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/* Don't increase the inode refcount: it's already open anyway */
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if ((ino = find_inode(ino_nr)) == NULL)
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return EINVAL;
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attr.a_mask = HGFS_ATTR_MODE | HGFS_ATTR_SIZE | HGFS_ATTR_ATIME |
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HGFS_ATTR_MTIME | HGFS_ATTR_CTIME;
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if ((r = verify_inode(ino, path, &attr)) != OK)
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return r;
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memset(&stat, 0, sizeof(struct stat));
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stat.st_dev = state.dev;
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stat.st_ino = ino_nr;
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stat.st_mode = get_mode(ino, attr.a_mode);
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stat.st_uid = opt.uid;
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stat.st_gid = opt.gid;
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stat.st_rdev = NO_DEV;
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if (cmp64u(attr.a_size, LONG_MAX) > 0)
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stat.st_size = LONG_MAX;
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else
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stat.st_size = ex64lo(attr.a_size);
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stat.st_atime = attr.a_atime;
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stat.st_mtime = attr.a_mtime;
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stat.st_ctime = attr.a_ctime;
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stat.st_blocks = stat.st_size / S_BLKSIZE;
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if (stat.st_size % S_BLKSIZE != 0)
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stat.st_blocks += 1;
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stat.st_blksize = BLOCK_SIZE;
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/* We could make this more accurate by iterating over directory inodes'
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* children, counting how many of those are directories as well.
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* It's just not worth it.
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*/
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stat.st_nlink = 0;
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if (ino->i_parent != NULL) stat.st_nlink++;
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if (IS_DIR(ino)) {
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stat.st_nlink++;
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if (HAS_CHILDREN(ino)) stat.st_nlink++;
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}
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return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
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(vir_bytes) &stat, sizeof(stat), D);
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}
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/*===========================================================================*
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* do_chmod *
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*===========================================================================*/
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PUBLIC int do_chmod()
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{
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/* Change file mode.
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*/
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struct inode *ino;
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char path[PATH_MAX];
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struct hgfs_attr attr;
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int r;
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if (state.read_only)
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return EROFS;
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if ((ino = find_inode(m_in.REQ_INODE_NR)) == NULL)
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return EINVAL;
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if ((r = verify_inode(ino, path, NULL)) != OK)
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return r;
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/* Set the new file mode. */
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attr.a_mask = HGFS_ATTR_MODE;
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attr.a_mode = m_in.REQ_MODE; /* no need to convert in this direction */
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if ((r = hgfs_setattr(path, &attr)) != OK)
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return r;
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/* We have no idea what really happened. Query for the mode again. */
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if ((r = verify_path(path, ino, &attr, NULL)) != OK)
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return r;
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m_out.RES_MODE = get_mode(ino, attr.a_mode);
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return OK;
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}
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/*===========================================================================*
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* do_utime *
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*===========================================================================*/
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PUBLIC int do_utime()
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{
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/* Set file times.
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*/
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struct inode *ino;
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char path[PATH_MAX];
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struct hgfs_attr attr;
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int r;
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if (state.read_only)
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return EROFS;
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if ((ino = find_inode(m_in.REQ_INODE_NR)) == NULL)
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return EINVAL;
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if ((r = verify_inode(ino, path, NULL)) != OK)
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return r;
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attr.a_mask = HGFS_ATTR_ATIME | HGFS_ATTR_MTIME;
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attr.a_atime = m_in.REQ_ACTIME;
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attr.a_mtime = m_in.REQ_MODTIME;
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return hgfs_setattr(path, &attr);
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}
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