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![David Howells](/assets/img/avatar_default.png)
Change the cifs filesystem to take account of the changes to fscache's indexing rewrite and reenable caching in cifs. The following changes have been made: (1) The fscache_netfs struct is no more, and there's no need to register the filesystem as a whole. (2) The session cookie is now an fscache_volume cookie, allocated with fscache_acquire_volume(). That takes three parameters: a string representing the "volume" in the index, a string naming the cache to use (or NULL) and a u64 that conveys coherency metadata for the volume. For cifs, I've made it render the volume name string as: "cifs,<ipaddress>,<sharename>" where the sharename has '/' characters replaced with ';'. This probably needs rethinking a bit as the total name could exceed the maximum filename component length. Further, the coherency data is currently just set to 0. It needs something else doing with it - I wonder if it would suffice simply to sum the resource_id, vol_create_time and vol_serial_number or maybe hash them. (3) The fscache_cookie_def is no more and needed information is passed directly to fscache_acquire_cookie(). The cache no longer calls back into the filesystem, but rather metadata changes are indicated at other times. fscache_acquire_cookie() is passed the same keying and coherency information as before. (4) The functions to set/reset cookies are removed and fscache_use_cookie() and fscache_unuse_cookie() are used instead. fscache_use_cookie() is passed a flag to indicate if the cookie is opened for writing. fscache_unuse_cookie() is passed updates for the metadata if we changed it (ie. if the file was opened for writing). These are called when the file is opened or closed. (5) cifs_setattr_*() are made to call fscache_resize() to change the size of the cache object. (6) The functions to read and write data are stubbed out pending a conversion to use netfslib. Changes ======= ver #8: - Abstract cache invalidation into a helper function. - Fix some checkpatch warnings[3]. ver #7: - Removed the accidentally added-back call to get the super cookie in cifs_root_iget(). - Fixed the right call to cifs_fscache_get_super_cookie() to take account of the "-o fsc" mount flag. ver #6: - Moved the change of gfpflags_allow_blocking() to current_is_kswapd() for cifs here. - Fixed one of the error paths in cifs_atomic_open() to jump around the call to use the cookie. - Fixed an additional successful return in the middle of cifs_open() to use the cookie on the way out. - Only get a volume cookie (and thus inode cookies) when "-o fsc" is supplied to mount. ver #5: - Fixed a couple of bits of cookie handling[2]: - The cookie should be released in cifs_evict_inode(), not cifsFileInfo_put_final(). The cookie needs to persist beyond file closure so that writepages will be able to write to it. - fscache_use_cookie() needs to be called in cifs_atomic_open() as it is for cifs_open(). ver #4: - Fixed the use of sizeof with memset. - tcon->vol_create_time is __le64 so doesn't need cpu_to_le64(). ver #3: - Canonicalise the cifs coherency data to make the cache portable. - Set volume coherency data. ver #2: - Use gfpflags_allow_blocking() rather than using flag directly. - Upgraded to -rc4 to allow for upstream changes[1]. - fscache_acquire_volume() now returns errors. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Jeff Layton <jlayton@kernel.org> cc: Steve French <smfrench@gmail.com> cc: Shyam Prasad N <nspmangalore@gmail.com> cc: linux-cifs@vger.kernel.org cc: linux-cachefs@redhat.com Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=23b55d673d7527b093cd97b7c217c82e70cd1af0 [1] Link: https://lore.kernel.org/r/3419813.1641592362@warthog.procyon.org.uk/ [2] Link: https://lore.kernel.org/r/CAH2r5muTanw9pJqzAHd01d9A8keeChkzGsCEH6=0rHutVLAF-A@mail.gmail.com/ [3] Link: https://lore.kernel.org/r/163819671009.215744.11230627184193298714.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/163906982979.143852.10672081929614953210.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/163967187187.1823006.247415138444991444.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/164021579335.640689.2681324337038770579.stgit@warthog.procyon.org.uk/ # v4 Link: https://lore.kernel.org/r/3462849.1641593783@warthog.procyon.org.uk/ # v5 Link: https://lore.kernel.org/r/1318953.1642024578@warthog.procyon.org.uk/ # v6 Signed-off-by: Steve French <stfrench@microsoft.com>
864 lines
22 KiB
C
864 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->treeName, 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->treeName, 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 *
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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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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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struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_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(tcon->treeName, MAX_TREE_SIZE + 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, tcon->treeName, 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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/*
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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
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cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
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struct tcon_link *tlink, unsigned oflags, umode_t mode,
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__u32 *oplock, struct cifs_fid *fid)
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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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FILE_ALL_INFO *buf = NULL;
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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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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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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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buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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if (buf == NULL) {
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rc = -ENOMEM;
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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.tcon = tcon;
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oparms.cifs_sb = cifs_sb;
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oparms.desired_access = desired_access;
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oparms.create_options = cifs_create_options(cifs_sb, create_options);
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oparms.disposition = disposition;
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oparms.path = full_path;
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oparms.fid = fid;
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oparms.reconnect = false;
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oparms.mode = mode;
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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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/*
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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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/* 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,
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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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cifs_create_set_dentry:
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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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kfree(buf);
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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)
|
|
server->ops->close(xid, tcon, fid);
|
|
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;
|
|
|
|
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);
|
|
|
|
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);
|
|
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);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_create(struct user_namespace *mnt_userns, 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;
|
|
|
|
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))))
|
|
return -EIO;
|
|
|
|
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);
|
|
if (!rc && server->ops->close)
|
|
server->ops->close(xid, tcon, &fid);
|
|
|
|
cifs_put_tlink(tlink);
|
|
out_free_xid:
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_mknod(struct user_namespace *mnt_userns, 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,
|
|
};
|