minix/servers/mfs/stadir.c

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#include "fs.h"
#include <string.h>
#include <assert.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include "inode.h"
#include "super.h"
#include <minix/vfsif.h>
/*===========================================================================*
* estimate_blocks *
*===========================================================================*/
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static blkcnt_t estimate_blocks(struct inode *rip)
{
/* Return the number of 512-byte blocks used by this file. This includes space
* used by data zones and indirect blocks (actually also zones). Reading in all
* indirect blocks is too costly for a stat call, so we disregard holes and
* return a conservative estimation.
*/
unsigned int zone_size, zones, sindirs, dindirs, nr_indirs, sq_indirs;
/* Compute the number of zones used by the file. */
zone_size = rip->i_sp->s_block_size << rip->i_sp->s_log_zone_size;
zones = (rip->i_size + zone_size - 1) / zone_size;
/* Compute the number of indirect blocks needed for that zone count. */
nr_indirs = rip->i_nindirs;
sq_indirs = nr_indirs * nr_indirs;
sindirs = (zones - rip->i_ndzones + nr_indirs - 1) / nr_indirs;
dindirs = (sindirs - 1 + sq_indirs - 1) / sq_indirs;
/* Return the number of 512-byte blocks corresponding to the number of data
* zones and indirect blocks.
*/
return (zones + sindirs + dindirs) * (zone_size / 512);
}
/*===========================================================================*
* stat_inode *
*===========================================================================*/
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static int stat_inode(
register struct inode *rip, /* pointer to inode to stat */
endpoint_t who_e, /* Caller endpoint */
cp_grant_id_t gid /* grant for the stat buf */
)
{
/* Common code for stat and fstat system calls. */
struct stat statbuf;
mode_t mo;
int r, s;
/* Update the atime, ctime, and mtime fields in the inode, if need be. */
if (rip->i_update) update_times(rip);
/* Fill in the statbuf struct. */
mo = rip->i_mode & I_TYPE;
/* true iff special */
s = (mo == I_CHAR_SPECIAL || mo == I_BLOCK_SPECIAL);
memset(&statbuf, 0, sizeof(struct stat));
statbuf.st_dev = rip->i_dev;
statbuf.st_ino = rip->i_num;
statbuf.st_mode = rip->i_mode;
statbuf.st_nlink = rip->i_nlinks;
statbuf.st_uid = rip->i_uid;
statbuf.st_gid = rip->i_gid;
statbuf.st_rdev = (s ? (dev_t) rip->i_zone[0] : NO_DEV);
statbuf.st_size = rip->i_size;
statbuf.st_atime = rip->i_atime;
statbuf.st_mtime = rip->i_mtime;
statbuf.st_ctime = rip->i_ctime;
statbuf.st_blksize = fs_block_size;
statbuf.st_blocks = estimate_blocks(rip);
/* Copy the struct to user space. */
r = sys_safecopyto(who_e, gid, (vir_bytes) 0, (vir_bytes) &statbuf,
(size_t) sizeof(statbuf));
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return(r);
}
/*===========================================================================*
* fs_fstatfs *
*===========================================================================*/
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int fs_fstatfs()
{
struct statfs st;
struct inode *rip;
int r;
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if((rip = find_inode(fs_dev, ROOT_INODE)) == NULL)
return(EINVAL);
st.f_bsize = rip->i_sp->s_block_size;
/* Copy the struct to user space. */
r = sys_safecopyto(fs_m_in.m_source, (cp_grant_id_t) fs_m_in.REQ_GRANT,
(vir_bytes) 0, (vir_bytes) &st, (size_t) sizeof(st));
return(r);
}
/*===========================================================================*
* fs_statvfs *
*===========================================================================*/
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int fs_statvfs()
{
struct statvfs st;
struct super_block *sp;
int r, scale;
u32_t used;
sp = get_super(fs_dev);
scale = sp->s_log_zone_size;
blockstats((u32_t *) &st.f_blocks, (u32_t *) &st.f_bfree, &used);
st.f_bavail = st.f_bfree;
st.f_bsize = sp->s_block_size << scale;
st.f_frsize = sp->s_block_size;
st.f_files = sp->s_ninodes;
st.f_ffree = count_free_bits(sp, IMAP);
st.f_favail = st.f_ffree;
st.f_fsid = fs_dev;
st.f_flag = (sp->s_rd_only == 1 ? ST_RDONLY : 0);
st.f_namemax = MFS_DIRSIZ;
/* Copy the struct to user space. */
r = sys_safecopyto(fs_m_in.m_source, fs_m_in.REQ_GRANT, 0, (vir_bytes) &st,
(phys_bytes) sizeof(st));
return(r);
}
/*===========================================================================*
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* fs_stat *
*===========================================================================*/
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int fs_stat()
{
register int r; /* return value */
register struct inode *rip; /* target inode */
if ((rip = get_inode(fs_dev, (ino_t) fs_m_in.REQ_INODE_NR)) == NULL)
return(EINVAL);
r = stat_inode(rip, fs_m_in.m_source, (cp_grant_id_t) fs_m_in.REQ_GRANT);
put_inode(rip); /* release the inode */
return(r);
}