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cifs: make cifs_rename handle -EACCES errors
cifs: make cifs_rename handle -EACCES errors Some servers seem to return -EACCES when attempting to rename one open file on top of another. Refactor the cifs_rename logic to attempt to rename the target file out of the way in this situation. This also fixes the "unlink_target" logic to be undoable if the subsequent rename fails. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton
Steve French
parent
413460980e
commit
14121bdccc
180
fs/cifs/inode.c
180
fs/cifs/inode.c
@ -1285,22 +1285,24 @@ cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
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return rc;
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}
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int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
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struct inode *target_inode, struct dentry *target_direntry)
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int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
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struct inode *target_dir, struct dentry *target_dentry)
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{
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char *fromName = NULL;
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char *toName = NULL;
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struct cifs_sb_info *cifs_sb_source;
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struct cifs_sb_info *cifs_sb_target;
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struct cifsTconInfo *pTcon;
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struct cifsTconInfo *tcon;
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struct cifsInodeInfo *target_cinode;
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FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
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FILE_UNIX_BASIC_INFO *info_buf_target;
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int xid;
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int rc;
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__u16 dstfid;
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int xid, rc, tmprc, oplock = 0;
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bool delete_already_pending;
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cifs_sb_target = CIFS_SB(target_inode->i_sb);
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cifs_sb_source = CIFS_SB(source_inode->i_sb);
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pTcon = cifs_sb_source->tcon;
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cifs_sb_target = CIFS_SB(target_dir->i_sb);
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cifs_sb_source = CIFS_SB(source_dir->i_sb);
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tcon = cifs_sb_source->tcon;
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xid = GetXid();
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@ -1308,7 +1310,7 @@ int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
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* BB: this might be allowed if same server, but different share.
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* Consider adding support for this
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*/
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if (pTcon != cifs_sb_target->tcon) {
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if (tcon != cifs_sb_target->tcon) {
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rc = -EXDEV;
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goto cifs_rename_exit;
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}
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@ -1317,65 +1319,133 @@ int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
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* we already have the rename sem so we do not need to
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* grab it again here to protect the path integrity
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*/
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fromName = build_path_from_dentry(source_direntry);
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fromName = build_path_from_dentry(source_dentry);
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if (fromName == NULL) {
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rc = -ENOMEM;
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goto cifs_rename_exit;
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}
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toName = build_path_from_dentry(target_direntry);
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toName = build_path_from_dentry(target_dentry);
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if (toName == NULL) {
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rc = -ENOMEM;
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goto cifs_rename_exit;
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}
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rc = cifs_do_rename(xid, source_direntry, fromName,
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target_direntry, toName);
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rc = cifs_do_rename(xid, source_dentry, fromName,
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target_dentry, toName);
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if (rc == -EEXIST) {
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if (pTcon->unix_ext) {
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/*
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* Are src and dst hardlinks of same inode? We can
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* only tell with unix extensions enabled
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*/
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info_buf_source =
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kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
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GFP_KERNEL);
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if (info_buf_source == NULL)
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goto unlink_target;
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info_buf_target = info_buf_source + 1;
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rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
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info_buf_source,
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cifs_sb_source->local_nls,
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cifs_sb_source->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc != 0)
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goto unlink_target;
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rc = CIFSSMBUnixQPathInfo(xid, pTcon,
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toName, info_buf_target,
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cifs_sb_target->local_nls,
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/* remap based on source sb */
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cifs_sb_source->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc == 0 && (info_buf_source->UniqueId ==
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info_buf_target->UniqueId))
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/* same file, POSIX says that this is a noop */
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goto cifs_rename_exit;
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} /* else ... BB we could add the same check for Windows by
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checking the UniqueId via FILE_INTERNAL_INFO */
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unlink_target:
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if (rc == -EEXIST && tcon->unix_ext) {
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/*
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* we either can not tell the files are hardlinked (as with
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* Windows servers) or files are not hardlinked. Delete the
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* target manually before renaming to follow POSIX rather than
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* Windows semantics
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* Are src and dst hardlinks of same inode? We can
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* only tell with unix extensions enabled
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*/
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cifs_unlink(target_inode, target_direntry);
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rc = cifs_do_rename(xid, source_direntry, fromName,
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target_direntry, toName);
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info_buf_source =
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kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
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GFP_KERNEL);
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if (info_buf_source == NULL) {
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rc = -ENOMEM;
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goto cifs_rename_exit;
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}
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info_buf_target = info_buf_source + 1;
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rc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
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info_buf_source,
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cifs_sb_source->local_nls,
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cifs_sb_source->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc != 0)
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goto unlink_target;
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rc = CIFSSMBUnixQPathInfo(xid, tcon,
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toName, info_buf_target,
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cifs_sb_target->local_nls,
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/* remap based on source sb */
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cifs_sb_source->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (rc == 0 && (info_buf_source->UniqueId ==
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info_buf_target->UniqueId))
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/* same file, POSIX says that this is a noop */
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goto cifs_rename_exit;
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rc = -EEXIST;
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} /* else ... BB we could add the same check for Windows by
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checking the UniqueId via FILE_INTERNAL_INFO */
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if ((rc == -EACCES) || (rc == -EEXIST)) {
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unlink_target:
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/* don't bother if this is a negative dentry */
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if (!target_dentry->d_inode)
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goto cifs_rename_exit;
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target_cinode = CIFS_I(target_dentry->d_inode);
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/* try to move the target out of the way */
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tmprc = CIFSSMBOpen(xid, tcon, toName, FILE_OPEN, DELETE,
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CREATE_NOT_DIR, &dstfid, &oplock, NULL,
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cifs_sb_target->local_nls,
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cifs_sb_target->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (tmprc)
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goto cifs_rename_exit;
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/* rename the file to random name */
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tmprc = CIFSSMBRenameOpenFile(xid, tcon, dstfid, NULL,
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cifs_sb_target->local_nls,
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cifs_sb_target->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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if (tmprc)
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goto close_target;
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delete_already_pending = target_cinode->delete_pending;
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if (!delete_already_pending) {
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/* set delete on close */
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tmprc = CIFSSMBSetFileDisposition(xid, tcon,
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true, dstfid,
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current->tgid);
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/*
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* This hack is for broken samba servers, remove this
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* once more fixed ones are in the field.
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*/
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if (tmprc == -ENOENT)
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delete_already_pending = false;
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else if (tmprc)
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goto undo_target_rename;
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target_cinode->delete_pending = true;
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}
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rc = cifs_do_rename(xid, source_dentry, fromName,
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target_dentry, toName);
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if (rc == 0)
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goto close_target;
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/*
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* after this point, we can't bother with error handling on
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* the undo's. This is best effort since we can't do anything
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* about failures here.
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*/
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if (!delete_already_pending) {
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tmprc = CIFSSMBSetFileDisposition(xid, tcon,
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false, dstfid,
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current->tgid);
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if (tmprc == 0)
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target_cinode->delete_pending = false;
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}
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undo_target_rename:
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/* rename failed: undo target rename */
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CIFSSMBRenameOpenFile(xid, tcon, dstfid,
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target_dentry->d_name.name,
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cifs_sb_target->local_nls,
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cifs_sb_target->mnt_cifs_flags &
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CIFS_MOUNT_MAP_SPECIAL_CHR);
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close_target:
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CIFSSMBClose(xid, tcon, dstfid);
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}
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cifs_rename_exit:
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