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-----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEE6fsu8pdIjtWE/DpLiiy9cAdyT1EFAmP2kaAACgkQiiy9cAdy T1Eergv9FHVs7hS0anJF0xgRghR4+g0m5UUo08iJazgJdDgcS5JY+ZasIpYpEsG3 QmsIT33XVYZypXoOzjMSsPlwo6esTCJQScVLz85e4ebedCbCBDks+wVQcbfTzD5/ KrwmUoTBLU0L/ppFhqRk9k53nrSf1SXCWPthjdfWa3mTHdIVM4kQJruTWwUDiJXp mdYwTx6FnTNer3QWetNzYOwdUgLu3rk0zLcBwQNCo6g5LOpA44iFfEAO4zeiOuZT LMDPbDj0nWQyWPLLdcbtsn2laYyEBDBLZevLirSaqPQ/KCtGcw0mBt6dCAzg8/CM ONqHHxdEpvPON8Sxujcn4CxpXhl0nCLwwtKtWU4rt7IevI9U+PynNl57TtJJ16/s b3XD2QVbFjlcdAMTmArvqnogdzoC3mZu1R1IRs+jukhLAOqZiLN6o/E2HAllt47i krzXeXIzQr10w9fnJ7LtIc/7IUFgtUfrOkg4TKyNcnRVHQaSSxv+JLRgqMPOr/M0 I7zt0G0j =4hIT -----END PGP SIGNATURE----- Merge tag '6.3-rc-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6 Pull cifs client updates from Steve French: "The largest subset of this is from David Howells et al: making the cifs/smb3 driver pass iov_iters down to the lowest layers, directly to the network transport rather than passing lists of pages around, helping multiple areas: - Pin user pages, thereby fixing the race between concurrent DIO read and fork, where the pages containing the DIO read buffer may end up belonging to the child process and not the parent - with the result that the parent might not see the retrieved data. - cifs shouldn't take refs on pages extracted from non-user-backed iterators (eg. KVEC). With these changes, cifs will apply the appropriate cleanup. - Making it easier to transition to using folios in cifs rather than pages by dealing with them through BVEC and XARRAY iterators. - Allowing cifs to use the new splice function The remainder are: - fixes for stable, including various fixes for uninitialized memory, wrong length field causing mount issue to very old servers, important directory lease fixes and reconnect fixes - cleanups (unused code removal, change one element array usage, and a change form strtobool to kstrtobool, and Kconfig cleanups) - SMBDIRECT (RDMA) fixes including iov_iter integration and UAF fixes - reconnect fixes - multichannel fixes, including improving channel allocation (to least used channel) - remove the last use of lock_page_killable by moving to folio_lock_killable" * tag '6.3-rc-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6: (46 commits) update internal module version number for cifs.ko cifs: update ip_addr for ses only for primary chan setup cifs: use tcon allocation functions even for dummy tcon cifs: use the least loaded channel for sending requests cifs: DIO to/from KVEC-type iterators should now work cifs: Remove unused code cifs: Build the RDMA SGE list directly from an iterator cifs: Change the I/O paths to use an iterator rather than a page list cifs: Add a function to read into an iter from a socket cifs: Add some helper functions cifs: Add a function to Hash the contents of an iterator cifs: Add a function to build an RDMA SGE list from an iterator netfs: Add a function to extract an iterator into a scatterlist netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator cifs: Implement splice_read to pass down ITER_BVEC not ITER_PIPE splice: Export filemap/direct_splice_read() iov_iter: Add a function to extract a page list from an iterator iov_iter: Define flags to qualify page extraction. splice: Add a func to do a splice from an O_DIRECT file without ITER_PIPE splice: Add a func to do a splice from a buffered file without ITER_PIPE ...
876 lines
22 KiB
C
876 lines
22 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* vfs operations that deal with dentries
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*
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* Copyright (C) International Business Machines Corp., 2002,2009
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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*/
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#include "fs_context.h"
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#include "cifs_ioctl.h"
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#include "fscache.h"
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static void
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renew_parental_timestamps(struct dentry *direntry)
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{
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/* BB check if there is a way to get the kernel to do this or if we
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really need this */
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do {
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cifs_set_time(direntry, jiffies);
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direntry = direntry->d_parent;
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} while (!IS_ROOT(direntry));
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}
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char *
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cifs_build_path_to_root(struct smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb,
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struct cifs_tcon *tcon, int add_treename)
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{
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int pplen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
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int dfsplen;
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char *full_path = NULL;
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/* if no prefix path, simply set path to the root of share to "" */
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if (pplen == 0) {
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full_path = kzalloc(1, GFP_KERNEL);
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return full_path;
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}
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if (add_treename)
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dfsplen = strnlen(tcon->tree_name, MAX_TREE_SIZE + 1);
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else
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dfsplen = 0;
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full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
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if (full_path == NULL)
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return full_path;
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if (dfsplen)
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memcpy(full_path, tcon->tree_name, dfsplen);
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full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
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memcpy(full_path + dfsplen + 1, ctx->prepath, pplen);
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convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
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return full_path;
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}
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/* Note: caller must free return buffer */
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const char *
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build_path_from_dentry(struct dentry *direntry, void *page)
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{
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
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bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS;
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return build_path_from_dentry_optional_prefix(direntry, page,
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prefix);
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}
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char *__build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
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const char *tree, int tree_len,
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bool prefix)
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{
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int dfsplen;
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int pplen = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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char dirsep = CIFS_DIR_SEP(cifs_sb);
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char *s;
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if (unlikely(!page))
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return ERR_PTR(-ENOMEM);
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if (prefix)
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dfsplen = strnlen(tree, tree_len + 1);
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else
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dfsplen = 0;
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
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pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
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s = dentry_path_raw(direntry, page, PATH_MAX);
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if (IS_ERR(s))
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return s;
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if (!s[1]) // for root we want "", not "/"
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s++;
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if (s < (char *)page + pplen + dfsplen)
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return ERR_PTR(-ENAMETOOLONG);
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if (pplen) {
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cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath);
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s -= pplen;
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memcpy(s + 1, cifs_sb->prepath, pplen - 1);
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*s = '/';
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}
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if (dirsep != '/') {
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/* BB test paths to Windows with '/' in the midst of prepath */
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char *p;
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for (p = s; *p; p++)
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if (*p == '/')
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*p = dirsep;
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}
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if (dfsplen) {
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s -= dfsplen;
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memcpy(s, tree, dfsplen);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
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int i;
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for (i = 0; i < dfsplen; i++) {
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if (s[i] == '\\')
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s[i] = '/';
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}
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}
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}
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return s;
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}
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char *build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
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bool prefix)
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{
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
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return __build_path_from_dentry_optional_prefix(direntry, page, tcon->tree_name,
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MAX_TREE_SIZE, prefix);
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}
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/*
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* Don't allow path components longer than the server max.
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* Don't allow the separator character in a path component.
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* The VFS will not allow "/", but "\" is allowed by posix.
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*/
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static int
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check_name(struct dentry *direntry, struct cifs_tcon *tcon)
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{
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struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
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int i;
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if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
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direntry->d_name.len >
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le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
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return -ENAMETOOLONG;
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if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) {
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for (i = 0; i < direntry->d_name.len; i++) {
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if (direntry->d_name.name[i] == '\\') {
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cifs_dbg(FYI, "Invalid file name\n");
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return -EINVAL;
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}
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}
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}
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return 0;
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}
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/* Inode operations in similar order to how they appear in Linux file fs.h */
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static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
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struct tcon_link *tlink, unsigned int oflags, umode_t mode, __u32 *oplock,
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struct cifs_fid *fid, struct cifs_open_info_data *buf)
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{
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int rc = -ENOENT;
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int create_options = CREATE_NOT_DIR;
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int desired_access;
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struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
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struct cifs_tcon *tcon = tlink_tcon(tlink);
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const char *full_path;
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void *page = alloc_dentry_path();
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struct inode *newinode = NULL;
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int disposition;
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struct TCP_Server_Info *server = tcon->ses->server;
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struct cifs_open_parms oparms;
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*oplock = 0;
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if (tcon->ses->server->oplocks)
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*oplock = REQ_OPLOCK;
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full_path = build_path_from_dentry(direntry, page);
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if (IS_ERR(full_path)) {
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free_dentry_path(page);
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return PTR_ERR(full_path);
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}
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
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(CIFS_UNIX_POSIX_PATH_OPS_CAP &
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le64_to_cpu(tcon->fsUnixInfo.Capability))) {
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rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode,
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oflags, oplock, &fid->netfid, xid);
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switch (rc) {
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case 0:
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if (newinode == NULL) {
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/* query inode info */
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goto cifs_create_get_file_info;
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}
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if (S_ISDIR(newinode->i_mode)) {
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CIFSSMBClose(xid, tcon, fid->netfid);
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iput(newinode);
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rc = -EISDIR;
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goto out;
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}
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if (!S_ISREG(newinode->i_mode)) {
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/*
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* The server may allow us to open things like
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* FIFOs, but the client isn't set up to deal
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* with that. If it's not a regular file, just
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* close it and proceed as if it were a normal
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* lookup.
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*/
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CIFSSMBClose(xid, tcon, fid->netfid);
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goto cifs_create_get_file_info;
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}
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/* success, no need to query */
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goto cifs_create_set_dentry;
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case -ENOENT:
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goto cifs_create_get_file_info;
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case -EIO:
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case -EINVAL:
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/*
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* EIO could indicate that (posix open) operation is not
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* supported, despite what server claimed in capability
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* negotiation.
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*
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* POSIX open in samba versions 3.3.1 and earlier could
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* incorrectly fail with invalid parameter.
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*/
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tcon->broken_posix_open = true;
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break;
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case -EREMOTE:
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case -EOPNOTSUPP:
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/*
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* EREMOTE indicates DFS junction, which is not handled
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* in posix open. If either that or op not supported
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* returned, follow the normal lookup.
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*/
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break;
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default:
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goto out;
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}
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/*
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* fallthrough to retry, using older open call, this is case
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* where server does not support this SMB level, and falsely
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* claims capability (also get here for DFS case which should be
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* rare for path not covered on files)
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*/
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}
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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desired_access = 0;
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if (OPEN_FMODE(oflags) & FMODE_READ)
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desired_access |= GENERIC_READ; /* is this too little? */
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if (OPEN_FMODE(oflags) & FMODE_WRITE)
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desired_access |= GENERIC_WRITE;
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disposition = FILE_OVERWRITE_IF;
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if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
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disposition = FILE_CREATE;
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else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
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disposition = FILE_OVERWRITE_IF;
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else if ((oflags & O_CREAT) == O_CREAT)
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disposition = FILE_OPEN_IF;
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else
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cifs_dbg(FYI, "Create flag not set in create function\n");
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/*
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* BB add processing to set equivalent of mode - e.g. via CreateX with
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* ACLs
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*/
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if (!server->ops->open) {
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rc = -ENOSYS;
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goto out;
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}
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/*
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* if we're not using unix extensions, see if we need to set
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* ATTR_READONLY on the create call
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*/
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if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
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create_options |= CREATE_OPTION_READONLY;
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oparms = (struct cifs_open_parms) {
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.tcon = tcon,
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.cifs_sb = cifs_sb,
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.desired_access = desired_access,
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.create_options = cifs_create_options(cifs_sb, create_options),
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.disposition = disposition,
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.path = full_path,
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.fid = fid,
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.mode = mode,
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};
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rc = server->ops->open(xid, &oparms, oplock, buf);
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if (rc) {
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cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc);
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goto out;
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}
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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/*
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* If Open reported that we actually created a file then we now have to
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* set the mode if possible.
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*/
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if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) {
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struct cifs_unix_set_info_args args = {
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.mode = mode,
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.ctime = NO_CHANGE_64,
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.atime = NO_CHANGE_64,
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.mtime = NO_CHANGE_64,
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.device = 0,
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};
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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args.uid = current_fsuid();
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if (inode->i_mode & S_ISGID)
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args.gid = inode->i_gid;
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else
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args.gid = current_fsgid();
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} else {
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args.uid = INVALID_UID; /* no change */
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args.gid = INVALID_GID; /* no change */
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}
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CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid,
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current->tgid);
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} else {
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/*
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* BB implement mode setting via Windows security
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* descriptors e.g.
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*/
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/* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/
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/* Could set r/o dos attribute if mode & 0222 == 0 */
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}
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cifs_create_get_file_info:
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/* server might mask mode so we have to query for it */
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if (tcon->unix_ext)
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rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
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xid);
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else {
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#else
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{
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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/* TODO: Add support for calling POSIX query info here, but passing in fid */
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rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, xid, fid);
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if (newinode) {
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if (server->ops->set_lease_key)
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server->ops->set_lease_key(newinode, fid);
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if ((*oplock & CIFS_CREATE_ACTION) && S_ISREG(newinode->i_mode)) {
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
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newinode->i_mode = mode;
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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newinode->i_uid = current_fsuid();
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if (inode->i_mode & S_ISGID)
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newinode->i_gid = inode->i_gid;
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else
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newinode->i_gid = current_fsgid();
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}
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}
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}
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}
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#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
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cifs_create_set_dentry:
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#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
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if (rc != 0) {
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cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
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rc);
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goto out_err;
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}
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if (newinode)
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if (S_ISDIR(newinode->i_mode)) {
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rc = -EISDIR;
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goto out_err;
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}
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d_drop(direntry);
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d_add(direntry, newinode);
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out:
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free_dentry_path(page);
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return rc;
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out_err:
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if (server->ops->close)
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server->ops->close(xid, tcon, fid);
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if (newinode)
|
|
iput(newinode);
|
|
goto out;
|
|
}
|
|
|
|
int
|
|
cifs_atomic_open(struct inode *inode, struct dentry *direntry,
|
|
struct file *file, unsigned oflags, umode_t mode)
|
|
{
|
|
int rc;
|
|
unsigned int xid;
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_fid fid = {};
|
|
struct cifs_pending_open open;
|
|
__u32 oplock;
|
|
struct cifsFileInfo *file_info;
|
|
struct cifs_open_info_data buf = {};
|
|
|
|
if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Posix open is only called (at lookup time) for file create now. For
|
|
* opens (rather than creates), because we do not know if it is a file
|
|
* or directory yet, and current Samba no longer allows us to do posix
|
|
* open on dirs, we could end up wasting an open call on what turns out
|
|
* to be a dir. For file opens, we wait to call posix open till
|
|
* cifs_open. It could be added to atomic_open in the future but the
|
|
* performance tradeoff of the extra network request when EISDIR or
|
|
* EACCES is returned would have to be weighed against the 50% reduction
|
|
* in network traffic in the other paths.
|
|
*/
|
|
if (!(oflags & O_CREAT)) {
|
|
struct dentry *res;
|
|
|
|
/*
|
|
* Check for hashed negative dentry. We have already revalidated
|
|
* the dentry and it is fine. No need to perform another lookup.
|
|
*/
|
|
if (!d_in_lookup(direntry))
|
|
return -ENOENT;
|
|
|
|
res = cifs_lookup(inode, direntry, 0);
|
|
if (IS_ERR(res))
|
|
return PTR_ERR(res);
|
|
|
|
return finish_no_open(file, res);
|
|
}
|
|
|
|
xid = get_xid();
|
|
|
|
cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
|
|
inode, direntry, direntry);
|
|
|
|
tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
|
|
if (IS_ERR(tlink)) {
|
|
rc = PTR_ERR(tlink);
|
|
goto out_free_xid;
|
|
}
|
|
|
|
tcon = tlink_tcon(tlink);
|
|
|
|
rc = check_name(direntry, tcon);
|
|
if (rc)
|
|
goto out;
|
|
|
|
server = tcon->ses->server;
|
|
|
|
if (server->ops->new_lease_key)
|
|
server->ops->new_lease_key(&fid);
|
|
|
|
cifs_add_pending_open(&fid, tlink, &open);
|
|
|
|
rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode,
|
|
&oplock, &fid, &buf);
|
|
if (rc) {
|
|
cifs_del_pending_open(&open);
|
|
goto out;
|
|
}
|
|
|
|
if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
|
|
file->f_mode |= FMODE_CREATED;
|
|
|
|
rc = finish_open(file, direntry, generic_file_open);
|
|
if (rc) {
|
|
if (server->ops->close)
|
|
server->ops->close(xid, tcon, &fid);
|
|
cifs_del_pending_open(&open);
|
|
goto out;
|
|
}
|
|
|
|
if (file->f_flags & O_DIRECT &&
|
|
CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
|
|
if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
|
|
file->f_op = &cifs_file_direct_nobrl_ops;
|
|
else
|
|
file->f_op = &cifs_file_direct_ops;
|
|
}
|
|
|
|
file_info = cifs_new_fileinfo(&fid, file, tlink, oplock, buf.symlink_target);
|
|
if (file_info == NULL) {
|
|
if (server->ops->close)
|
|
server->ops->close(xid, tcon, &fid);
|
|
cifs_del_pending_open(&open);
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
fscache_use_cookie(cifs_inode_cookie(file_inode(file)),
|
|
file->f_mode & FMODE_WRITE);
|
|
|
|
out:
|
|
cifs_put_tlink(tlink);
|
|
out_free_xid:
|
|
free_xid(xid);
|
|
cifs_free_open_info(&buf);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_create(struct mnt_idmap *idmap, struct inode *inode,
|
|
struct dentry *direntry, umode_t mode, bool excl)
|
|
{
|
|
int rc;
|
|
unsigned int xid = get_xid();
|
|
/*
|
|
* BB below access is probably too much for mknod to request
|
|
* but we have to do query and setpathinfo so requesting
|
|
* less could fail (unless we want to request getatr and setatr
|
|
* permissions (only). At least for POSIX we do not have to
|
|
* request so much.
|
|
*/
|
|
unsigned oflags = O_EXCL | O_CREAT | O_RDWR;
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_fid fid;
|
|
__u32 oplock;
|
|
struct cifs_open_info_data buf = {};
|
|
|
|
cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
|
|
inode, direntry, direntry);
|
|
|
|
if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb)))) {
|
|
rc = -EIO;
|
|
goto out_free_xid;
|
|
}
|
|
|
|
tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb));
|
|
rc = PTR_ERR(tlink);
|
|
if (IS_ERR(tlink))
|
|
goto out_free_xid;
|
|
|
|
tcon = tlink_tcon(tlink);
|
|
server = tcon->ses->server;
|
|
|
|
if (server->ops->new_lease_key)
|
|
server->ops->new_lease_key(&fid);
|
|
|
|
rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, &oplock, &fid, &buf);
|
|
if (!rc && server->ops->close)
|
|
server->ops->close(xid, tcon, &fid);
|
|
|
|
cifs_free_open_info(&buf);
|
|
cifs_put_tlink(tlink);
|
|
out_free_xid:
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_mknod(struct mnt_idmap *idmap, struct inode *inode,
|
|
struct dentry *direntry, umode_t mode, dev_t device_number)
|
|
{
|
|
int rc = -EPERM;
|
|
unsigned int xid;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *tcon;
|
|
const char *full_path;
|
|
void *page;
|
|
|
|
if (!old_valid_dev(device_number))
|
|
return -EINVAL;
|
|
|
|
cifs_sb = CIFS_SB(inode->i_sb);
|
|
if (unlikely(cifs_forced_shutdown(cifs_sb)))
|
|
return -EIO;
|
|
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink))
|
|
return PTR_ERR(tlink);
|
|
|
|
page = alloc_dentry_path();
|
|
tcon = tlink_tcon(tlink);
|
|
xid = get_xid();
|
|
|
|
full_path = build_path_from_dentry(direntry, page);
|
|
if (IS_ERR(full_path)) {
|
|
rc = PTR_ERR(full_path);
|
|
goto mknod_out;
|
|
}
|
|
|
|
rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
|
|
full_path, mode,
|
|
device_number);
|
|
|
|
mknod_out:
|
|
free_dentry_path(page);
|
|
free_xid(xid);
|
|
cifs_put_tlink(tlink);
|
|
return rc;
|
|
}
|
|
|
|
struct dentry *
|
|
cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
|
|
unsigned int flags)
|
|
{
|
|
unsigned int xid;
|
|
int rc = 0; /* to get around spurious gcc warning, set to zero here */
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct tcon_link *tlink;
|
|
struct cifs_tcon *pTcon;
|
|
struct inode *newInode = NULL;
|
|
const char *full_path;
|
|
void *page;
|
|
int retry_count = 0;
|
|
|
|
xid = get_xid();
|
|
|
|
cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n",
|
|
parent_dir_inode, direntry, direntry);
|
|
|
|
/* check whether path exists */
|
|
|
|
cifs_sb = CIFS_SB(parent_dir_inode->i_sb);
|
|
tlink = cifs_sb_tlink(cifs_sb);
|
|
if (IS_ERR(tlink)) {
|
|
free_xid(xid);
|
|
return ERR_CAST(tlink);
|
|
}
|
|
pTcon = tlink_tcon(tlink);
|
|
|
|
rc = check_name(direntry, pTcon);
|
|
if (unlikely(rc)) {
|
|
cifs_put_tlink(tlink);
|
|
free_xid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/* can not grab the rename sem here since it would
|
|
deadlock in the cases (beginning of sys_rename itself)
|
|
in which we already have the sb rename sem */
|
|
page = alloc_dentry_path();
|
|
full_path = build_path_from_dentry(direntry, page);
|
|
if (IS_ERR(full_path)) {
|
|
cifs_put_tlink(tlink);
|
|
free_xid(xid);
|
|
free_dentry_path(page);
|
|
return ERR_CAST(full_path);
|
|
}
|
|
|
|
if (d_really_is_positive(direntry)) {
|
|
cifs_dbg(FYI, "non-NULL inode in lookup\n");
|
|
} else {
|
|
cifs_dbg(FYI, "NULL inode in lookup\n");
|
|
}
|
|
cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
|
|
full_path, d_inode(direntry));
|
|
|
|
again:
|
|
if (pTcon->posix_extensions)
|
|
rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
|
|
else if (pTcon->unix_ext) {
|
|
rc = cifs_get_inode_info_unix(&newInode, full_path,
|
|
parent_dir_inode->i_sb, xid);
|
|
} else {
|
|
rc = cifs_get_inode_info(&newInode, full_path, NULL,
|
|
parent_dir_inode->i_sb, xid, NULL);
|
|
}
|
|
|
|
if (rc == 0) {
|
|
/* since paths are not looked up by component - the parent
|
|
directories are presumed to be good here */
|
|
renew_parental_timestamps(direntry);
|
|
} else if (rc == -EAGAIN && retry_count++ < 10) {
|
|
goto again;
|
|
} else if (rc == -ENOENT) {
|
|
cifs_set_time(direntry, jiffies);
|
|
newInode = NULL;
|
|
} else {
|
|
if (rc != -EACCES) {
|
|
cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
|
|
/* We special case check for Access Denied - since that
|
|
is a common return code */
|
|
}
|
|
newInode = ERR_PTR(rc);
|
|
}
|
|
free_dentry_path(page);
|
|
cifs_put_tlink(tlink);
|
|
free_xid(xid);
|
|
return d_splice_alias(newInode, direntry);
|
|
}
|
|
|
|
static int
|
|
cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
|
|
{
|
|
struct inode *inode;
|
|
int rc;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
if (d_really_is_positive(direntry)) {
|
|
inode = d_inode(direntry);
|
|
if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode)))
|
|
CIFS_I(inode)->time = 0; /* force reval */
|
|
|
|
rc = cifs_revalidate_dentry(direntry);
|
|
if (rc) {
|
|
cifs_dbg(FYI, "cifs_revalidate_dentry failed with rc=%d", rc);
|
|
switch (rc) {
|
|
case -ENOENT:
|
|
case -ESTALE:
|
|
/*
|
|
* Those errors mean the dentry is invalid
|
|
* (file was deleted or recreated)
|
|
*/
|
|
return 0;
|
|
default:
|
|
/*
|
|
* Otherwise some unexpected error happened
|
|
* report it as-is to VFS layer
|
|
*/
|
|
return rc;
|
|
}
|
|
}
|
|
else {
|
|
/*
|
|
* If the inode wasn't known to be a dfs entry when
|
|
* the dentry was instantiated, such as when created
|
|
* via ->readdir(), it needs to be set now since the
|
|
* attributes will have been updated by
|
|
* cifs_revalidate_dentry().
|
|
*/
|
|
if (IS_AUTOMOUNT(inode) &&
|
|
!(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) {
|
|
spin_lock(&direntry->d_lock);
|
|
direntry->d_flags |= DCACHE_NEED_AUTOMOUNT;
|
|
spin_unlock(&direntry->d_lock);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This may be nfsd (or something), anyway, we can't see the
|
|
* intent of this. So, since this can be for creation, drop it.
|
|
*/
|
|
if (!flags)
|
|
return 0;
|
|
|
|
/*
|
|
* Drop the negative dentry, in order to make sure to use the
|
|
* case sensitive name which is specified by user if this is
|
|
* for creation.
|
|
*/
|
|
if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
|
|
return 0;
|
|
|
|
if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* static int cifs_d_delete(struct dentry *direntry)
|
|
{
|
|
int rc = 0;
|
|
|
|
cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry);
|
|
|
|
return rc;
|
|
} */
|
|
|
|
const struct dentry_operations cifs_dentry_ops = {
|
|
.d_revalidate = cifs_d_revalidate,
|
|
.d_automount = cifs_dfs_d_automount,
|
|
/* d_delete: cifs_d_delete, */ /* not needed except for debugging */
|
|
};
|
|
|
|
static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q)
|
|
{
|
|
struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
|
|
unsigned long hash;
|
|
wchar_t c;
|
|
int i, charlen;
|
|
|
|
hash = init_name_hash(dentry);
|
|
for (i = 0; i < q->len; i += charlen) {
|
|
charlen = codepage->char2uni(&q->name[i], q->len - i, &c);
|
|
/* error out if we can't convert the character */
|
|
if (unlikely(charlen < 0))
|
|
return charlen;
|
|
hash = partial_name_hash(cifs_toupper(c), hash);
|
|
}
|
|
q->hash = end_name_hash(hash);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cifs_ci_compare(const struct dentry *dentry,
|
|
unsigned int len, const char *str, const struct qstr *name)
|
|
{
|
|
struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls;
|
|
wchar_t c1, c2;
|
|
int i, l1, l2;
|
|
|
|
/*
|
|
* We make the assumption here that uppercase characters in the local
|
|
* codepage are always the same length as their lowercase counterparts.
|
|
*
|
|
* If that's ever not the case, then this will fail to match it.
|
|
*/
|
|
if (name->len != len)
|
|
return 1;
|
|
|
|
for (i = 0; i < len; i += l1) {
|
|
/* Convert characters in both strings to UTF-16. */
|
|
l1 = codepage->char2uni(&str[i], len - i, &c1);
|
|
l2 = codepage->char2uni(&name->name[i], name->len - i, &c2);
|
|
|
|
/*
|
|
* If we can't convert either character, just declare it to
|
|
* be 1 byte long and compare the original byte.
|
|
*/
|
|
if (unlikely(l1 < 0 && l2 < 0)) {
|
|
if (str[i] != name->name[i])
|
|
return 1;
|
|
l1 = 1;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Here, we again ass|u|me that upper/lowercase versions of
|
|
* a character are the same length in the local NLS.
|
|
*/
|
|
if (l1 != l2)
|
|
return 1;
|
|
|
|
/* Now compare uppercase versions of these characters */
|
|
if (cifs_toupper(c1) != cifs_toupper(c2))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct dentry_operations cifs_ci_dentry_ops = {
|
|
.d_revalidate = cifs_d_revalidate,
|
|
.d_hash = cifs_ci_hash,
|
|
.d_compare = cifs_ci_compare,
|
|
.d_automount = cifs_dfs_d_automount,
|
|
};
|