ef7b484e5c
This Shared Folders File System library (libsffs) now contains all the file system logic originally in HGFS. The actual HGFS server code is now a stub that passes on all the work to libsffs. The libhgfs library is changed accordingly.
169 lines
4.2 KiB
C
169 lines
4.2 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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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 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 & sffs_params->p_dir_mask);
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else
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mode = S_IFREG | (mode & sffs_params->p_file_mask);
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if (state.s_read_only)
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mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
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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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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 sffs_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 = SFFS_ATTR_MODE | SFFS_ATTR_SIZE | SFFS_ATTR_CRTIME |
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SFFS_ATTR_ATIME | SFFS_ATTR_MTIME | SFFS_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.s_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 = sffs_params->p_uid;
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stat.st_gid = sffs_params->p_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_atimespec = attr.a_atime;
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stat.st_mtimespec = attr.a_mtime;
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stat.st_ctimespec = attr.a_ctime;
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stat.st_birthtimespec = attr.a_crtime;
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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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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 sffs_attr attr;
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int r;
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if (state.s_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 = SFFS_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 = sffs_table->t_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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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 sffs_attr attr;
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int r;
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if (state.s_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 = SFFS_ATTR_ATIME | SFFS_ATTR_MTIME;
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attr.a_atime.tv_sec = m_in.REQ_ACTIME;
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attr.a_atime.tv_nsec = 0;
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attr.a_mtime.tv_sec = m_in.REQ_MODTIME;
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attr.a_mtime.tv_nsec = 0;
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return sffs_table->t_setattr(path, &attr);
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}
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