104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* 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 <string.h>
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#include <assert.h>
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#include <minix/vfsif.h>
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#include "puffs.h"
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#include "puffs_priv.h"
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void release_node(struct puffs_usermount *pu, struct puffs_node *pn)
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{
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assert(pn->pn_count == 0);
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/* Required if puffs_node_reclaim() decides to leave node in the list */
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pn->pn_mountpoint = FALSE;
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if (pu->pu_ops.puffs_node_reclaim) {
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if (global_pu->pu_ops.puffs_node_reclaim(global_pu, pn) != 0)
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lpuffs_debug("Warning: reclaim failed\n");
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} else {
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puffs_pn_put(pn);
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}
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}
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/*===========================================================================*
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* fs_putnode *
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*===========================================================================*/
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int fs_putnode(void)
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{
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/* Find the pnode specified by the request message and decrease its counter.
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* Release unused pnode.
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*/
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struct puffs_node *pn;
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int count = fs_m_in.REQ_COUNT;
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ino_t inum = fs_m_in.REQ_INODE_NR;
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if ((pn = puffs_pn_nodewalk(global_pu, 0, &inum)) == NULL) {
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/* XXX Probably removed from the list, see puffs_pn_remove() */
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struct puffs_node *pn_cur, *pn_next;
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pn_cur = LIST_FIRST(&global_pu->pu_pnode_removed_lst);
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while (pn_cur) {
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pn_next = LIST_NEXT(pn_cur, pn_entries);
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if (pn_cur->pn_va.va_fileid == inum) {
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pn = pn_cur;
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break;
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}
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pn_cur = pn_next;
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}
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}
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if (pn == NULL) {
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lpuffs_debug("%s:%d putnode: pnode #%ld dev: %d not found\n", __FILE__,
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__LINE__, inum, fs_dev);
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panic("fs_putnode failed");
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}
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if (count <= 0) {
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lpuffs_debug("%s:%d putnode: bad value for count: %d\n", __FILE__,
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__LINE__, count);
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panic("fs_putnode failed");
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} else if (pn->pn_count == 0) {
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/* FUSE fs might store in the list pnodes, which we hasn't
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* open, this means we got put request for file,
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* which wasn't opened by VFS.
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*/
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lpuffs_debug("%s:%d putnode: pn_count already zero\n", __FILE__,
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__LINE__);
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panic("fs_putnode failed");
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} else if (count > pn->pn_count) {
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struct puffs_node *pn_cur, *pn_next;
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struct puffs_usermount *pu = global_pu;
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ino_t ino = pn->pn_va.va_fileid;
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pn_cur = LIST_FIRST(&pu->pu_pnodelst);
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lpuffs_debug("inum count path polen hash\n");
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while (pn_cur) {
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pn_next = LIST_NEXT(pn_cur, pn_entries);
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if (pn_cur->pn_va.va_fileid == ino) {
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lpuffs_debug("%ld: %d %s %u %u\n", ino, pn_cur->pn_count,
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pn_cur->pn_po.po_path,
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pn_cur->pn_po.po_len,
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pn_cur->pn_po.po_hash);
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}
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pn_cur = pn_next;
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}
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lpuffs_debug("%s:%d putnode: count too high: %d > %d\n", __FILE__,
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__LINE__, count, pn->pn_count);
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panic("fs_putnode failed");
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}
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pn->pn_count -= count;
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if (pn->pn_count == 0)
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release_node(global_pu, pn);
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return(OK);
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}
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