a9d0ffbd0d
The next commit will make mode_t 32-bits, ino_t 64-bits, nlink_t 32-bits, and off_t 64-bits. However, in the protocol there is no room for that. When analyzing the usage of these data types we can see that of mode_t we currently use 15 bits and that future flags (if copied from NetBSD) are only of importance to VFS and not to the actual file system on disk. Therefore we can get away with keeping the protocol version of mode_t (pmode_t) 16 bits. At this point it is unlikely that MINIX will support file systems that can hold more than 2^32 files. Keeping the protocol version of ino_t (pino_t) 32-bits and exposing it as 64-bits to the rest of the system is fine. uid_t and gid_t are already 32-bits, but in behind the scenes they're 16-bits. This is sufficient since we don't support uid/gids larger than 2^16-1. off_t will become 64-bits, but the protocol had room reserved for that since it was revised years ago. So to make the difference clear between what the protocol supports and what is exposed to the system, we define protocol version of these data types. Change-Id: Ifb883aafb222142e69d6dcc3049a47170b78b3ee
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* Created (MFS based):
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* June 2011 (Evgeniy Ivanov)
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*/
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#include "fs.h"
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#include <fcntl.h>
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#include <string.h>
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#include <minix/com.h>
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#include <sys/stat.h>
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#include <minix/ds.h>
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#include <minix/vfsif.h>
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#include "puffs_priv.h"
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/*===========================================================================*
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* fs_readsuper *
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*===========================================================================*/
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int fs_readsuper()
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{
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struct vattr *root_va;
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fs_dev = fs_m_in.REQ_DEV;
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is_readonly_fs = (fs_m_in.REQ_FLAGS & REQ_RDONLY) ? 1 : 0;
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is_root_fs = (fs_m_in.REQ_FLAGS & REQ_ISROOT) ? 1 : 0;
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/* Open root pnode */
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global_pu->pu_pn_root->pn_count = 1;
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/* Root pnode properties */
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root_va = &global_pu->pu_pn_root->pn_va;
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fs_m_out.RES_INODE_NR = root_va->va_fileid;
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fs_m_out.RES_MODE = root_va->va_mode;
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fs_m_out.RES_FILE_SIZE_LO = root_va->va_size;
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fs_m_out.RES_UID = root_va->va_uid;
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fs_m_out.RES_GID = root_va->va_gid;
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fs_m_out.RES_PROTO = 0;
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VFS_FS_PROTO_PUT_VERSION(fs_m_out.RES_PROTO, VFS_FS_CURRENT_VERSION);
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VFS_FS_PROTO_PUT_CONREQS(fs_m_out.RES_PROTO, 1);
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return(OK);
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}
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/*===========================================================================*
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* fs_mountpoint *
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*===========================================================================*/
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int fs_mountpoint()
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{
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/* This function looks up the mount point, it checks the condition whether
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* the partition can be mounted on the pnode or not.
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*/
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int r = OK;
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struct puffs_node *pn;
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pmode_t bits;
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/*
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* XXX: we assume that lookup was done first, so pnode can be found with
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* puffs_pn_nodewalk.
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*/
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
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return(EINVAL);
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if (pn->pn_mountpoint) r = EBUSY;
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/* It may not be special. */
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bits = pn->pn_va.va_mode & I_TYPE;
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if(bits == I_BLOCK_SPECIAL || bits == I_CHAR_SPECIAL) r = ENOTDIR;
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if (r == OK)
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pn->pn_mountpoint = TRUE;
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return(r);
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}
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/*===========================================================================*
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* fs_unmount *
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*===========================================================================*/
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int fs_unmount()
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{
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int error;
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/* XXX there is no information about flags, 0 should be safe enough */
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error = global_pu->pu_ops.puffs_fs_unmount(global_pu, 0);
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if (error) {
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/* XXX we can't return any error to VFS */
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lpuffs_debug("user handler failed to unmount filesystem!\
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Force unmount!\n");
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}
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fs_sync();
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/* Finish off the unmount. */
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PU_SETSTATE(global_pu, PUFFS_STATE_UNMOUNTED);
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unmountdone = TRUE;
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global_pu->pu_pn_root->pn_count--;
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return(OK);
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}
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