447 lines
13 KiB
C
447 lines
13 KiB
C
/* This file contains the code for performing four system calls relating to
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* status and directories.
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*
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* The entry points into this file are
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* do_chdir: perform the CHDIR system call
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* do_chroot: perform the CHROOT system call
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* do_lstat: perform the LSTAT system call
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* do_stat: perform the STAT system call
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* do_fstat: perform the FSTAT system call
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* do_statvfs: perform the STATVFS1 system call
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* do_fstatvfs: perform the FSTATVFS1 system call
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* do_getvfsstat: perform the GETVFSSTAT system call
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*/
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#include "fs.h"
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#include <sys/stat.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include <string.h>
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#include "file.h"
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#include "path.h"
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#include <minix/vfsif.h>
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#include <minix/callnr.h>
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#include "vnode.h"
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#include "vmnt.h"
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static int change_into(struct vnode **iip, struct vnode *vp);
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/*===========================================================================*
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* do_fchdir *
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*===========================================================================*/
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int do_fchdir(void)
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{
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/* Change directory on already-opened fd. */
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struct filp *rfilp;
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int r, rfd;
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rfd = job_m_in.m_lc_vfs_fchdir.fd;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, rfilp->filp_vno);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_chdir *
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*===========================================================================*/
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int do_chdir(void)
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{
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/* Perform the chdir(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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if (copy_path(fullpath, sizeof(fullpath)) != OK)
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return(err_code);
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* do_chroot *
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*===========================================================================*/
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int do_chroot(void)
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{
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/* Perform the chroot(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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if (!super_user) return(EPERM); /* only su may chroot() */
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if (copy_path(fullpath, sizeof(fullpath)) != OK)
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return(err_code);
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_rd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* change_into *
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*===========================================================================*/
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static int change_into(struct vnode **result, struct vnode *vp)
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{
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int r;
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if (*result == vp) return(OK); /* Nothing to do */
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/* It must be a directory and also be searchable */
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if (!S_ISDIR(vp->v_mode))
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r = ENOTDIR;
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else
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r = forbidden(fp, vp, X_BIT); /* Check if dir is searchable*/
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if (r != OK) return(r);
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/* Everything is OK. Make the change. */
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put_vnode(*result); /* release the old directory */
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dup_vnode(vp);
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*result = vp; /* acquire the new one */
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return(OK);
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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(void)
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{
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/* Perform the stat(name, buf) system call. */
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = job_m_in.m_lc_vfs_stat.name;
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vname1_length = job_m_in.m_lc_vfs_stat.len;
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statbuf = job_m_in.m_lc_vfs_stat.buf;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstat *
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*===========================================================================*/
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int do_fstat(void)
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{
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/* Perform the fstat(fd, buf) system call. */
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register struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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statbuf = job_m_in.m_lc_vfs_fstat.buf;
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rfd = job_m_in.m_lc_vfs_fstat.fd;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_stat(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr,
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who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* update_statvfs *
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*===========================================================================*/
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int update_statvfs(struct vmnt *vmp, struct statvfs *buf)
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{
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/* Get statistics from a file system, and cache part of the results. */
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int r;
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if ((r = req_statvfs(vmp->m_fs_e, buf)) != OK)
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return r;
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vmp->m_stats.f_flag = buf->f_flag;
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vmp->m_stats.f_bsize = buf->f_bsize;
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vmp->m_stats.f_frsize = buf->f_frsize;
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vmp->m_stats.f_iosize = buf->f_iosize;
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vmp->m_stats.f_blocks = buf->f_blocks;
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vmp->m_stats.f_bfree = buf->f_bfree;
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vmp->m_stats.f_bavail = buf->f_bavail;
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vmp->m_stats.f_bresvd = buf->f_bresvd;
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vmp->m_stats.f_files = buf->f_files;
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vmp->m_stats.f_ffree = buf->f_ffree;
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vmp->m_stats.f_favail = buf->f_favail;
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vmp->m_stats.f_fresvd = buf->f_fresvd;
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vmp->m_stats.f_syncreads = buf->f_syncreads;
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vmp->m_stats.f_syncwrites = buf->f_syncwrites;
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vmp->m_stats.f_asyncreads = buf->f_asyncreads;
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vmp->m_stats.f_asyncwrites = buf->f_asyncwrites;
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vmp->m_stats.f_namemax = buf->f_namemax;
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return OK;
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}
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/*===========================================================================*
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* fill_statvfs *
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*===========================================================================*/
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static int fill_statvfs(struct vmnt *vmp, endpoint_t endpt, vir_bytes buf_addr,
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int flags)
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{
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/* Fill a statvfs structure in a userspace process. First let the target file
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* server fill in most fields, or use the cached copy if ST_NOWAIT is given.
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* Then fill in some remaining fields with local information. Finally, copy
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* the result to user space.
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*/
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struct statvfs buf;
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if (!(flags & ST_NOWAIT)) {
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/* Get fresh statistics from the file system. */
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if (update_statvfs(vmp, &buf) != OK)
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return EIO;
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} else {
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/* Use the cached statistics. */
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memset(&buf, 0, sizeof(buf));
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buf.f_flag = vmp->m_stats.f_flag;
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buf.f_bsize = vmp->m_stats.f_bsize;
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buf.f_frsize = vmp->m_stats.f_frsize;
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buf.f_iosize = vmp->m_stats.f_iosize;
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buf.f_blocks = vmp->m_stats.f_blocks;
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buf.f_bfree = vmp->m_stats.f_bfree;
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buf.f_bavail = vmp->m_stats.f_bavail;
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buf.f_bresvd = vmp->m_stats.f_bresvd;
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buf.f_files = vmp->m_stats.f_files;
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buf.f_ffree = vmp->m_stats.f_ffree;
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buf.f_favail = vmp->m_stats.f_favail;
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buf.f_fresvd = vmp->m_stats.f_fresvd;
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buf.f_syncreads = vmp->m_stats.f_syncreads;
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buf.f_syncwrites = vmp->m_stats.f_syncwrites;
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buf.f_asyncreads = vmp->m_stats.f_asyncreads;
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buf.f_asyncwrites = vmp->m_stats.f_asyncwrites;
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buf.f_namemax = vmp->m_stats.f_namemax;
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}
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if (vmp->m_flags & VMNT_READONLY)
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buf.f_flag |= ST_RDONLY;
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buf.f_fsid = (unsigned long)vmp->m_dev;
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buf.f_fsidx.__fsid_val[0] = (long)vmp->m_dev; /* This is what is done on NetBSD */
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buf.f_fsidx.__fsid_val[1] = 0; /* Here they convert the FS type name into a number. */
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strlcpy(buf.f_fstypename, vmp->m_fstype, sizeof(buf.f_fstypename));
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strlcpy(buf.f_mntonname, vmp->m_mount_path, sizeof(buf.f_mntonname));
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strlcpy(buf.f_mntfromname, vmp->m_mount_dev, sizeof(buf.f_mntfromname));
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return sys_datacopy_wrapper(SELF, (vir_bytes) &buf,
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endpt, buf_addr, sizeof(buf));
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}
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/*===========================================================================*
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* do_statvfs *
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*===========================================================================*/
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int do_statvfs(void)
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{
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/* Perform the statvfs1(name, buf, flags) system call. */
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int r, flags;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = job_m_in.m_lc_vfs_statvfs1.name;
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vname1_length = job_m_in.m_lc_vfs_statvfs1.len;
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statbuf = job_m_in.m_lc_vfs_statvfs1.buf;
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flags = job_m_in.m_lc_vfs_statvfs1.flags;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = fill_statvfs(vp->v_vmnt, who_e, statbuf, flags);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstatvfs *
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*===========================================================================*/
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int do_fstatvfs(void)
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{
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/* Perform the fstatvfs1(fd, buf, flags) system call. */
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register struct filp *rfilp;
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int r, rfd, flags;
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vir_bytes statbuf;
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rfd = job_m_in.m_lc_vfs_statvfs1.fd;
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statbuf = job_m_in.m_lc_vfs_statvfs1.buf;
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flags = job_m_in.m_lc_vfs_statvfs1.flags;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = fill_statvfs(rfilp->filp_vno->v_vmnt, who_e, statbuf, flags);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_getvfsstat *
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*===========================================================================*/
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int do_getvfsstat(void)
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{
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/* Perform the getvfsstat(buf, bufsize, flags) system call. */
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struct vmnt *vmp;
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vir_bytes buf;
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size_t bufsize;
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int r, flags, count, do_lock;
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buf = job_m_in.m_lc_vfs_getvfsstat.buf;
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bufsize = job_m_in.m_lc_vfs_getvfsstat.len;
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flags = job_m_in.m_lc_vfs_getvfsstat.flags;
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count = 0;
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if (buf != 0) {
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/* We only need to lock target file systems if we are going to query
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* them. This will only happen if ST_NOWAIT is not given. If we do
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* not lock, we rely on the VMNT_CANSTAT flag to protect us from
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* concurrent (un)mount operations. Note that procfs relies on
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* ST_NOWAIT calls being lock free, as it is a file system itself.
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*/
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do_lock = !(flags & ST_NOWAIT);
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; vmp++) {
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/* If there is no more space, return the count so far. */
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if (bufsize < sizeof(struct statvfs))
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break;
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/* Lock the file system before checking any fields. */
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if (do_lock && (r = lock_vmnt(vmp, VMNT_READ)) != OK)
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return r;
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/* Obtain information for this file system, if it is in use and
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* can be reported. File systems that are being (un)mounted
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* are skipped, as is PFS. The fill call will block only if
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* ST_NOWAIT was not given.
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*/
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if (vmp->m_dev != NO_DEV && (vmp->m_flags & VMNT_CANSTAT)) {
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if ((r = fill_statvfs(vmp, who_e, buf, flags)) != OK) {
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if (do_lock)
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unlock_vmnt(vmp);
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return r;
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}
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count++;
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buf += sizeof(struct statvfs);
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bufsize -= sizeof(struct statvfs);
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}
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if (do_lock)
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unlock_vmnt(vmp);
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}
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} else {
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/* Just report a file system count. No need to lock, as above. */
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; vmp++) {
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if (vmp->m_dev != NO_DEV && (vmp->m_flags & VMNT_CANSTAT))
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count++;
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}
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}
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return count;
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}
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/*===========================================================================*
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* do_lstat *
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*===========================================================================*/
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int do_lstat(void)
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{
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/* Perform the lstat(name, buf) system call. */
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struct vnode *vp;
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struct vmnt *vmp;
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int r;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = job_m_in.m_lc_vfs_stat.name;
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vname1_length = job_m_in.m_lc_vfs_stat.len;
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statbuf = job_m_in.m_lc_vfs_stat.buf;
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lookup_init(&resolve, fullpath, PATH_RET_SYMLINK, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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