dir.c (2c2c336506e9bd4056fca25301b8a06fb7aefd32) dir.c (0b3cc71b5ab31ef90eb9b8b2d8ca580fbf88c590)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/nfs/dir.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs directory handling functions
8 *

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689 S_ISDIR(dir->i_mode)) {
690 rcu_read_lock();
691 list_for_each_entry_rcu (ctx, &nfsi->open_files, list)
692 atomic_inc(&ctx->cache_misses);
693 rcu_read_unlock();
694 }
695}
696
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/nfs/dir.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs directory handling functions
8 *

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689 S_ISDIR(dir->i_mode)) {
690 rcu_read_lock();
691 list_for_each_entry_rcu (ctx, &nfsi->open_files, list)
692 atomic_inc(&ctx->cache_misses);
693 rcu_read_unlock();
694 }
695}
696
697static void nfs_lookup_advise_force_readdirplus(struct inode *dir)
697static void nfs_lookup_advise_force_readdirplus(struct inode *dir,
698 unsigned int flags)
698{
699 if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE))
700 return;
699{
700 if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE))
701 return;
702 if (flags & (LOOKUP_EXCL | LOOKUP_PARENT | LOOKUP_REVAL))
703 return;
701 nfs_readdir_record_entry_cache_miss(dir);
702}
703
704static
705void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry,
706 unsigned long dir_verifier)
707{
708 struct qstr filename = QSTR_INIT(entry->name, entry->len);

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1591static int
1592nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry,
1593 struct inode *inode)
1594{
1595 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1596 return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
1597}
1598
704 nfs_readdir_record_entry_cache_miss(dir);
705}
706
707static
708void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry,
709 unsigned long dir_verifier)
710{
711 struct qstr filename = QSTR_INIT(entry->name, entry->len);

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1594static int
1595nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry,
1596 struct inode *inode)
1597{
1598 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1599 return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
1600}
1601
1599static int
1600nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry,
1601 struct inode *inode)
1602static int nfs_lookup_revalidate_dentry(struct inode *dir,
1603 struct dentry *dentry,
1604 struct inode *inode, unsigned int flags)
1602{
1603 struct nfs_fh *fhandle;
1604 struct nfs_fattr *fattr;
1605 unsigned long dir_verifier;
1606 int ret;
1607
1605{
1606 struct nfs_fh *fhandle;
1607 struct nfs_fattr *fattr;
1608 unsigned long dir_verifier;
1609 int ret;
1610
1611 trace_nfs_lookup_revalidate_enter(dir, dentry, flags);
1612
1608 ret = -ENOMEM;
1609 fhandle = nfs_alloc_fhandle();
1610 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1611 if (fhandle == NULL || fattr == NULL)
1612 goto out;
1613
1614 dir_verifier = nfs_save_change_attribute(dir);
1615 ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);

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1620 ret = 0;
1621 break;
1622 case -ETIMEDOUT:
1623 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
1624 ret = 1;
1625 }
1626 goto out;
1627 }
1613 ret = -ENOMEM;
1614 fhandle = nfs_alloc_fhandle();
1615 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1616 if (fhandle == NULL || fattr == NULL)
1617 goto out;
1618
1619 dir_verifier = nfs_save_change_attribute(dir);
1620 ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);

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1625 ret = 0;
1626 break;
1627 case -ETIMEDOUT:
1628 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
1629 ret = 1;
1630 }
1631 goto out;
1632 }
1633
1634 /* Request help from readdirplus */
1635 nfs_lookup_advise_force_readdirplus(dir, flags);
1636
1628 ret = 0;
1629 if (nfs_compare_fh(NFS_FH(inode), fhandle))
1630 goto out;
1631 if (nfs_refresh_inode(inode, fattr) < 0)
1632 goto out;
1633
1634 nfs_setsecurity(inode, fattr);
1635 nfs_set_verifier(dentry, dir_verifier);
1636
1637 ret = 0;
1638 if (nfs_compare_fh(NFS_FH(inode), fhandle))
1639 goto out;
1640 if (nfs_refresh_inode(inode, fattr) < 0)
1641 goto out;
1642
1643 nfs_setsecurity(inode, fattr);
1644 nfs_set_verifier(dentry, dir_verifier);
1645
1637 /* set a readdirplus hint that we had a cache miss */
1638 nfs_lookup_advise_force_readdirplus(dir);
1639 ret = 1;
1640out:
1641 nfs_free_fattr(fattr);
1642 nfs_free_fhandle(fhandle);
1643
1644 /*
1645 * If the lookup failed despite the dentry change attribute being
1646 * a match, then we should revalidate the directory cache.

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1696 }
1697
1698 if (flags & LOOKUP_RCU)
1699 return -ECHILD;
1700
1701 if (NFS_STALE(inode))
1702 goto out_bad;
1703
1646 ret = 1;
1647out:
1648 nfs_free_fattr(fattr);
1649 nfs_free_fhandle(fhandle);
1650
1651 /*
1652 * If the lookup failed despite the dentry change attribute being
1653 * a match, then we should revalidate the directory cache.

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1703 }
1704
1705 if (flags & LOOKUP_RCU)
1706 return -ECHILD;
1707
1708 if (NFS_STALE(inode))
1709 goto out_bad;
1710
1704 trace_nfs_lookup_revalidate_enter(dir, dentry, flags);
1705 return nfs_lookup_revalidate_dentry(dir, dentry, inode);
1711 return nfs_lookup_revalidate_dentry(dir, dentry, inode, flags);
1706out_valid:
1707 return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
1708out_bad:
1709 if (flags & LOOKUP_RCU)
1710 return -ECHILD;
1711 return nfs_lookup_revalidate_done(dir, dentry, inode, 0);
1712}
1713

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1891 goto out;
1892 }
1893 inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
1894 res = ERR_CAST(inode);
1895 if (IS_ERR(res))
1896 goto out;
1897
1898 /* Notify readdir to use READDIRPLUS */
1712out_valid:
1713 return nfs_lookup_revalidate_done(dir, dentry, inode, 1);
1714out_bad:
1715 if (flags & LOOKUP_RCU)
1716 return -ECHILD;
1717 return nfs_lookup_revalidate_done(dir, dentry, inode, 0);
1718}
1719

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1897 goto out;
1898 }
1899 inode = nfs_fhget(dentry->d_sb, fhandle, fattr);
1900 res = ERR_CAST(inode);
1901 if (IS_ERR(res))
1902 goto out;
1903
1904 /* Notify readdir to use READDIRPLUS */
1899 nfs_lookup_advise_force_readdirplus(dir);
1905 nfs_lookup_advise_force_readdirplus(dir, flags);
1900
1901no_entry:
1902 res = d_splice_alias(inode, dentry);
1903 if (res != NULL) {
1904 if (IS_ERR(res))
1905 goto out;
1906 dentry = res;
1907 }

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2154 if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU))
2155 goto reval_dentry;
2156
2157 /* Let f_op->open() actually open (and revalidate) the file */
2158 return 1;
2159reval_dentry:
2160 if (flags & LOOKUP_RCU)
2161 return -ECHILD;
1906
1907no_entry:
1908 res = d_splice_alias(inode, dentry);
1909 if (res != NULL) {
1910 if (IS_ERR(res))
1911 goto out;
1912 dentry = res;
1913 }

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2160 if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU))
2161 goto reval_dentry;
2162
2163 /* Let f_op->open() actually open (and revalidate) the file */
2164 return 1;
2165reval_dentry:
2166 if (flags & LOOKUP_RCU)
2167 return -ECHILD;
2162 return nfs_lookup_revalidate_dentry(dir, dentry, inode);
2168 return nfs_lookup_revalidate_dentry(dir, dentry, inode, flags);
2163
2164full_reval:
2165 return nfs_do_lookup_revalidate(dir, dentry, flags);
2166}
2167
2168static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
2169{
2170 return __nfs_lookup_revalidate(dentry, flags,

--- 1025 unchanged lines hidden --- 		2169
2170full_reval:
2171 return nfs_do_lookup_revalidate(dir, dentry, flags);
2172}
2173
2174static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags)
2175{
2176 return __nfs_lookup_revalidate(dentry, flags,

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