167 lines
4.1 KiB
C
167 lines
4.1 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 | HGFS_ATTR_ATIME_SET |
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HGFS_ATTR_MTIME_SET;
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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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