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).
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
#include "fs.h"
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#include "inode.h"
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#include <string.h>
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#include <sys/stat.h>
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/*===========================================================================*
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* stat_inode *
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*===========================================================================*/
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PRIVATE int stat_inode(
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register struct inode *rip, /* pointer to inode to stat */
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endpoint_t who_e, /* Caller endpoint */
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cp_grant_id_t gid /* grant for the stat buf */
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)
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{
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/* Common code for stat and fstat system calls. */
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mode_t type;
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struct stat statbuf;
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u32_t blocks; /* The unit of this is 512 */
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int r, s;
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type = rip->i_mode & I_TYPE;
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s = (type == I_CHAR_SPECIAL || type == I_BLOCK_SPECIAL);
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/* Update the atime, ctime, and mtime fields in the inode, if need be. */
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if (rip->i_update) update_times(rip);
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blocks = rip->i_size / S_BLKSIZE;
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if (rip->i_size % S_BLKSIZE != 0)
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blocks += 1;
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memset(&statbuf, 0, sizeof(struct stat));
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statbuf.st_dev = rip->i_dev;
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statbuf.st_ino = rip->i_num;
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statbuf.st_mode = rip->i_mode;
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statbuf.st_nlink = rip->i_nlinks;
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statbuf.st_uid = rip->i_uid;
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statbuf.st_gid = (short int) rip->i_gid;
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statbuf.st_rdev = (dev_t) (s ? rip->i_rdev : NO_DEV);
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statbuf.st_size = rip->i_size;
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if (!s) statbuf.st_mode &= ~I_REGULAR;/* wipe out I_REGULAR bit for pipes */
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statbuf.st_atime = rip->i_atime;
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statbuf.st_mtime = rip->i_mtime;
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statbuf.st_ctime = rip->i_ctime;
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statbuf.st_blksize = PIPE_BUF;
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statbuf.st_blocks = blocks;
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/* Copy the struct to user space. */
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r = sys_safecopyto(who_e, gid, (vir_bytes) 0, (vir_bytes) &statbuf,
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(size_t) sizeof(statbuf), D);
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return(r);
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}
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/*===========================================================================*
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* fs_stat *
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*===========================================================================*/
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PUBLIC int fs_stat(message *fs_m_in, message *fs_m_out)
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{
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register int r; /* return value */
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register struct inode *rip; /* target inode */
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if( (rip = find_inode(fs_m_in->REQ_INODE_NR)) == NULL) return(EINVAL);
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get_inode(rip->i_dev, rip->i_num); /* mark inode in use */
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r = stat_inode(rip, fs_m_in->m_source, (cp_grant_id_t) fs_m_in->REQ_GRANT);
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put_inode(rip); /* release the inode */
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return(r);
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}
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