476 lines
14 KiB
C
476 lines
14 KiB
C
#include "fs.h"
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#include <stdlib.h>
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#include <assert.h>
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#include "puffs.h"
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#include "puffs_priv.h"
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/*===========================================================================*
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* fs_trunc *
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*===========================================================================*/
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int fs_trunc(ino_t ino_nr, off_t start, off_t end)
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{
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int r;
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struct puffs_node *pn;
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PUFFS_MAKECRED(pcr, &global_kcred);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL)
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return(EINVAL);
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if (end == 0) {
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struct vattr va;
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if (pn->pn_va.va_size == (u_quad_t) start)
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return(OK);
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if (global_pu->pu_ops.puffs_node_setattr == NULL)
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return(EINVAL);
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puffs_vattr_null(&va);
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va.va_size = start;
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r = global_pu->pu_ops.puffs_node_setattr(global_pu, pn, &va, pcr);
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if (r) return(EINVAL);
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} else {
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/* XXX zerofill the given region. Can we make a hole? */
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off_t bytes_left = end - start;
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char* rw_buf;
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if (global_pu->pu_ops.puffs_node_write == NULL)
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return(EINVAL);
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/* XXX split into chunks? */
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rw_buf = malloc(bytes_left);
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if (!rw_buf)
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panic("fs_ftrunc: failed to allocated memory\n");
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memset(rw_buf, 0, bytes_left);
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r = global_pu->pu_ops.puffs_node_write(global_pu, pn, (uint8_t *)rw_buf,
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start, (size_t *) &bytes_left, pcr, 0);
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free(rw_buf);
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if (r) return(EINVAL);
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}
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update_timens(pn, CTIME | MTIME, NULL);
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return(r);
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}
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/*===========================================================================*
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* fs_link *
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*===========================================================================*/
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int fs_link(ino_t dir_nr, char *name, ino_t ino_nr)
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{
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/* Perform the link(name1, name2) system call. */
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register int r;
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struct puffs_node *pn, *pn_dir, *new_pn;
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struct timespec cur_time;
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struct puffs_kcn pkcnp;
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PUFFS_MAKECRED(pcr, &global_kcred);
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struct puffs_cn pcn = {&pkcnp, (struct puffs_cred *) __UNCONST(pcr), {0,0,0}};
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if (global_pu->pu_ops.puffs_node_link == NULL)
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return(OK);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL)
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return(EINVAL);
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/* Check to see if the file has maximum number of links already. */
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if (pn->pn_va.va_nlink >= LINK_MAX)
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return(EMLINK);
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/* Linking directories is too dangerous to allow. */
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if (S_ISDIR(pn->pn_va.va_mode))
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return(EPERM);
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if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &dir_nr)) == NULL)
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return(EINVAL);
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if (pn_dir->pn_va.va_nlink == NO_LINK) {
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/* Dir does not actually exist */
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return(ENOENT);
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}
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/* If 'name2' exists in full (even if no space) set 'r' to error. */
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if ((new_pn = advance(pn_dir, name)) == NULL) {
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r = err_code;
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if (r == ENOENT) r = OK;
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} else {
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r = EEXIST;
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}
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if (r != OK) return(r);
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/* Try to link. */
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pcn.pcn_namelen = strlen(name);
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assert(pcn.pcn_namelen <= NAME_MAX);
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strcpy(pcn.pcn_name, name);
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if (buildpath) {
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if (puffs_path_pcnbuild(global_pu, &pcn, pn_dir) != 0)
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return(EINVAL);
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}
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if (global_pu->pu_ops.puffs_node_link(global_pu, pn_dir, pn, &pcn) != 0)
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r = EINVAL;
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if (buildpath)
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global_pu->pu_pathfree(global_pu, &pcn.pcn_po_full);
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if (r != OK) return(EINVAL);
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(void)clock_time(&cur_time);
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update_timens(pn, CTIME, &cur_time);
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update_timens(pn_dir, MTIME | CTIME, &cur_time);
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return(OK);
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}
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/*===========================================================================*
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* fs_rdlink *
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*===========================================================================*/
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ssize_t fs_rdlink(ino_t ino_nr, struct fsdriver_data *data, size_t bytes)
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{
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register int r; /* return value */
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struct puffs_node *pn;
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char path[PATH_MAX];
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PUFFS_MAKECRED(pcr, &global_kcred);
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if (bytes > sizeof(path))
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bytes = sizeof(path);
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &ino_nr)) == NULL)
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return(EINVAL);
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if (!S_ISLNK(pn->pn_va.va_mode))
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return(EACCES);
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if (global_pu->pu_ops.puffs_node_readlink == NULL)
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return(EINVAL);
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r = global_pu->pu_ops.puffs_node_readlink(global_pu, pn, pcr, path, &bytes);
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if (r != OK) {
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if (r > 0) r = -r;
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return(r);
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}
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r = fsdriver_copyout(data, 0, path, bytes);
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return (r == OK) ? bytes : r;
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}
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/*===========================================================================*
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* fs_rename *
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*===========================================================================*/
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int fs_rename(ino_t old_dir_nr, char *old_name, ino_t new_dir_nr,
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char *new_name)
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{
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/* Perform the rename(name1, name2) system call. */
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struct puffs_node *old_dirp, *old_ip; /* ptrs to old dir, file pnodes */
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struct puffs_node *new_dirp, *new_ip; /* ptrs to new dir, file pnodes */
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struct puffs_kcn pkcnp_src;
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PUFFS_MAKECRED(pcr_src, &global_kcred);
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struct puffs_cn pcn_src = {&pkcnp_src, (struct puffs_cred *) __UNCONST(pcr_src), {0,0,0}};
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struct puffs_kcn pkcnp_dest;
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PUFFS_MAKECRED(pcr_dest, &global_kcred);
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struct puffs_cn pcn_targ = {&pkcnp_dest, (struct puffs_cred *) __UNCONST(pcr_dest), {0,0,0}};
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int r = OK; /* error flag; initially no error */
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int odir, ndir; /* TRUE iff {old|new} file is dir */
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int same_pdir; /* TRUE iff parent dirs are the same */
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struct timespec cur_time;
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if (global_pu->pu_ops.puffs_node_rename == NULL)
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return(EINVAL);
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/* Copy the last component of the old name */
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pcn_src.pcn_namelen = strlen(old_name);
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assert(pcn_src.pcn_namelen <= NAME_MAX);
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strcpy(pcn_src.pcn_name, old_name);
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/* Copy the last component of the new name */
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pcn_targ.pcn_namelen = strlen(new_name);
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assert(pcn_targ.pcn_namelen <= NAME_MAX);
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strcpy(pcn_targ.pcn_name, new_name);
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/* Get old dir pnode */
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if ((old_dirp = puffs_pn_nodewalk(global_pu, 0, &old_dir_nr)) == NULL)
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return(ENOENT);
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old_ip = advance(old_dirp, pcn_src.pcn_name);
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if (!old_ip)
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return(err_code);
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if (old_ip->pn_mountpoint)
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return(EBUSY);
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/* Get new dir pnode */
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if ((new_dirp = puffs_pn_nodewalk(global_pu, 0, &new_dir_nr)) == NULL) {
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return(ENOENT);
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} else {
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if (new_dirp->pn_va.va_nlink == NO_LINK) {
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/* Dir does not actually exist */
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return(ENOENT);
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}
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}
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/* not required to exist */
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new_ip = advance(new_dirp, pcn_targ.pcn_name);
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/* If the node does exist, make sure it's not a mountpoint. */
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if (new_ip != NULL && new_ip->pn_mountpoint)
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return(EBUSY);
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if (old_ip != NULL) {
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/* TRUE iff dir */
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odir = ((old_ip->pn_va.va_mode & I_TYPE) == I_DIRECTORY);
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} else {
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odir = FALSE;
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}
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/* Check for a variety of possible errors. */
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same_pdir = (old_dirp == new_dirp);
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/* Some tests apply only if the new path exists. */
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if (new_ip == NULL) {
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if (odir && (new_dirp->pn_va.va_nlink >= SHRT_MAX ||
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new_dirp->pn_va.va_nlink >= LINK_MAX) && !same_pdir) {
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return(EMLINK);
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}
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} else {
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if (old_ip == new_ip) /* old=new */
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return(OK); /* do NOT update directory times in this case */
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/* dir ? */
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ndir = ((new_ip->pn_va.va_mode & I_TYPE) == I_DIRECTORY);
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if (odir == TRUE && ndir == FALSE) return(ENOTDIR);
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if (odir == FALSE && ndir == TRUE) return(EISDIR);
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}
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/* If a process has another root directory than the system root, we might
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* "accidently" be moving it's working directory to a place where it's
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* root directory isn't a super directory of it anymore. This can make
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* the function chroot useless. If chroot will be used often we should
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* probably check for it here. */
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/* The rename will probably work. Only two things can go wrong now:
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* 1. being unable to remove the new file. (when new file already exists)
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* 2. being unable to make the new directory entry. (new file doesn't exists)
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* [directory has to grow by one block and cannot because the disk
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* is completely full].
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* 3. Something (doubtfully) else depending on the FS.
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*/
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if (buildpath) {
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pcn_src.pcn_po_full = old_ip->pn_po;
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if (puffs_path_pcnbuild(global_pu, &pcn_targ, new_dirp) != 0)
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return(EINVAL);
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}
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r = global_pu->pu_ops.puffs_node_rename(global_pu, old_dirp, old_ip, &pcn_src,
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new_dirp, new_ip, &pcn_targ);
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if (r > 0) r = -r;
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if (buildpath) {
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if (r) {
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global_pu->pu_pathfree(global_pu, &pcn_targ.pcn_po_full);
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} else {
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struct puffs_pathinfo pi;
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struct puffs_pathobj po_old;
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/* handle this node */
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po_old = old_ip->pn_po;
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old_ip->pn_po = pcn_targ.pcn_po_full;
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if (old_ip->pn_va.va_type != VDIR) {
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global_pu->pu_pathfree(global_pu, &po_old);
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return(OK);
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}
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/* handle all child nodes for DIRs */
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pi.pi_old = &pcn_src.pcn_po_full;
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pi.pi_new = &pcn_targ.pcn_po_full;
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PU_LOCK();
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if (puffs_pn_nodewalk(global_pu, puffs_path_prefixadj, &pi)
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!= NULL) {
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/* Actually nomem */
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return(EINVAL);
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}
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PU_UNLOCK();
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global_pu->pu_pathfree(global_pu, &po_old);
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}
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}
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(void)clock_time(&cur_time);
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update_timens(old_dirp, MTIME | CTIME, &cur_time);
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update_timens(new_dirp, MTIME | CTIME, &cur_time);
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/* XXX see release_node comment in fs_unlink */
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if (new_ip && new_ip->pn_count == 0) {
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release_node(global_pu, new_ip);
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}
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return(r);
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}
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static int remove_dir(struct puffs_node *pn_dir, struct puffs_node *pn,
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struct puffs_cn *pcn);
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static int unlink_file(struct puffs_node *dirp, struct puffs_node *pn,
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struct puffs_cn *pcn);
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/*===========================================================================*
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* fs_unlink *
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*===========================================================================*/
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int fs_unlink(ino_t dir_nr, char *name, int call)
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{
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/* Perform the unlink(name) or rmdir(name) system call. The code for these two
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* is almost the same. They differ only in some condition testing.
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*/
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int r;
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struct puffs_node *pn, *pn_dir;
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struct timespec cur_time;
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struct puffs_kcn pkcnp;
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struct puffs_cn pcn = {&pkcnp, 0, {0,0,0}};
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PUFFS_KCREDTOCRED(pcn.pcn_cred, &global_kcred);
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/* Copy the last component */
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pcn.pcn_namelen = strlen(name);
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assert(pcn.pcn_namelen <= NAME_MAX);
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strcpy(pcn.pcn_name, name);
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if ((pn_dir = puffs_pn_nodewalk(global_pu, 0, &dir_nr)) == NULL)
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return(EINVAL);
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/* The last directory exists. Does the file also exist? */
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pn = advance(pn_dir, pcn.pcn_name);
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r = err_code;
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/* If error, return pnode. */
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if (r != OK)
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return(r);
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if (pn->pn_mountpoint)
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return EBUSY;
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/* Now test if the call is allowed, separately for unlink() and rmdir(). */
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if (call == FSC_UNLINK) {
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r = unlink_file(pn_dir, pn, &pcn);
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} else {
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r = remove_dir(pn_dir, pn, &pcn); /* call is RMDIR */
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}
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if (pn->pn_va.va_nlink != 0) {
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(void)clock_time(&cur_time);
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update_timens(pn, CTIME, &cur_time);
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update_timens(pn_dir, MTIME | CTIME, &cur_time);
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}
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/* XXX Ideally, we should check pn->pn_flags & PUFFS_NODE_REMOVED, but
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* librefuse doesn't set it (neither manually or via puffs_pn_remove() ).
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* Thus we just check that "pn_count == 0". Otherwise release_node()
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* will be called in fs_put().
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*/
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if (pn->pn_count == 0)
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release_node(global_pu, pn);
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return(r);
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}
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/*===========================================================================*
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* remove_dir *
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*===========================================================================*/
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static int remove_dir(
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struct puffs_node *pn_dir, /* parent directory */
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struct puffs_node *pn, /* directory to be removed */
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struct puffs_cn *pcn /* Name, creads of directory */
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)
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{
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/* A directory file has to be removed. Five conditions have to met:
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* - The file must be a directory
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* - The directory must be empty (except for . and ..)
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* - The final component of the path must not be . or ..
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* - The directory must not be the root of a mounted file system (VFS)
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* - The directory must not be anybody's root/working directory (VFS)
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*/
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/* "." and ".." dentries can be stored in 28 bytes */
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#define EMPTY_DIR_DENTRIES_SIZE 28
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int r;
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char remove_dir_buf[EMPTY_DIR_DENTRIES_SIZE];
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struct dirent *dent = (struct dirent*) remove_dir_buf;
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int buf_left = EMPTY_DIR_DENTRIES_SIZE;
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off_t pos = 0;
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int eofflag = 0;
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if (global_pu->pu_ops.puffs_node_rmdir == NULL)
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return(EINVAL);
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if (!S_ISDIR(pn->pn_va.va_mode))
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return(ENOTDIR);
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/* Check if directory is empty */
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r = global_pu->pu_ops.puffs_node_readdir(global_pu, pn, dent, &pos,
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(size_t *)&buf_left, pcn->pcn_cred, &eofflag, 0, 0);
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if (r) return(EINVAL);
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if (!eofflag) return(ENOTEMPTY);
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if (pn->pn_va.va_fileid == global_pu->pu_pn_root->pn_va.va_fileid)
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return(EBUSY); /* can't remove 'root' */
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if (buildpath) {
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r = puffs_path_pcnbuild(global_pu, pcn, pn_dir);
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if (r) return(EINVAL);
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}
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r = global_pu->pu_ops.puffs_node_rmdir(global_pu, pn_dir, pn, pcn);
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global_pu->pu_pathfree(global_pu, &pcn->pcn_po_full);
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if (r) return(EINVAL);
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return(OK);
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}
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/*===========================================================================*
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* unlink_file *
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*===========================================================================*/
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static int unlink_file(
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struct puffs_node *dirp, /* parent directory of file */
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struct puffs_node *pn, /* pnode of file, may be NULL too. */
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struct puffs_cn *pcn /* Name, creads of file */
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)
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{
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/* Unlink 'file_name'; pn must be the pnode of 'file_name' */
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int r;
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assert(pn != NULL);
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if (global_pu->pu_ops.puffs_node_remove == NULL)
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return(EINVAL);
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if (S_ISDIR(pn->pn_va.va_mode))
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return(EPERM);
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if (buildpath) {
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r = puffs_path_pcnbuild(global_pu, pcn, dirp);
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if (r)
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return(EINVAL);
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}
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r = global_pu->pu_ops.puffs_node_remove(global_pu, dirp, pn, pcn);
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global_pu->pu_pathfree(global_pu, &pcn->pcn_po_full);
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if (r) return(EINVAL);
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return(OK);
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}
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