70 lines
2.2 KiB
C
70 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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static 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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pmode_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));
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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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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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