From 41c59ffeb460159ad079b67f6e202c409e4bd5c0 Mon Sep 17 00:00:00 2001 From: Meetakshi Setiya Date: Fri, 9 Feb 2024 05:13:22 -0500 Subject: [PATCH 2/3] smb: client: do not defer close open handles to deleted files When a file/dentry has been deleted before closing all its open handles, currently, closing them can add them to the deferred close list. This can lead to problems in creating file with the same name when the file is re-created before the deferred close completes. This issue was seen while reusing a client's already existing lease on a file for compound operations and xfstest 591 failed because of the deferred close handle that remained valid even after the file was deleted and was being reused to create a file with the same name. The server in this case returns an error on open with STATUS_DELETE_PENDING. Recreating the file would fail till the deferred handles are closed (duration specified in closetimeo). This patch fixes the issue by flagging all open handles for the deleted file (file path to be precise) by setting status_file_deleted to true in the cifsFileInfo structure. As per the information classes specified in MS-FSCC, SMB2 query info response from the server has a DeletePending field, set to true to indicate that deletion has been requested on that file. If this is the case, flag the open handles for this file too. When doing close in cifs_close for each of these handles, check the value of this boolean field and do not defer close these handles if the corresponding filepath has been deleted. Signed-off-by: Meetakshi Setiya --- fs/smb/client/cifsglob.h | 1 + fs/smb/client/cifsproto.h | 4 ++++ fs/smb/client/file.c | 2 +- fs/smb/client/inode.c | 30 +++++++++++++++++++++++++++--- fs/smb/client/misc.c | 34 ++++++++++++++++++++++++++++++++++ fs/smb/client/smb2inode.c | 9 ++++++++- 6 files changed, 75 insertions(+), 5 deletions(-) diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 50f7e47c2229..a88c8328b29c 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1417,6 +1417,7 @@ struct cifsFileInfo { bool invalidHandle:1; /* file closed via session abend */ bool swapfile:1; bool oplock_break_cancelled:1; + bool status_file_deleted:1; /* file has been deleted */ unsigned int oplock_epoch; /* epoch from the lease break */ __u32 oplock_level; /* oplock/lease level from the lease break */ int count; diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h index ef98c840791f..1f46e0db6e92 100644 --- a/fs/smb/client/cifsproto.h +++ b/fs/smb/client/cifsproto.h @@ -296,6 +296,10 @@ extern void cifs_close_all_deferred_files(struct cifs_tcon *cifs_tcon); extern void cifs_close_deferred_file_under_dentry(struct cifs_tcon *cifs_tcon, const char *path); + +extern void cifs_mark_open_handles_for_deleted_file(struct inode *inode, + const char *path); + extern struct TCP_Server_Info * cifs_get_tcp_session(struct smb3_fs_context *ctx, struct TCP_Server_Info *primary_server); diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index b75282c204da..bed86cc8cc22 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -1085,7 +1085,7 @@ int cifs_close(struct inode *inode, struct file *file) if ((cifs_sb->ctx->closetimeo && cinode->oplock == CIFS_CACHE_RHW_FLG) && cinode->lease_granted && !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) && - dclose) { + dclose && !(cfile->status_file_deleted)) { if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) { inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c index 3073eac989ea..0c851135e1f3 100644 --- a/fs/smb/client/inode.c +++ b/fs/smb/client/inode.c @@ -893,9 +893,14 @@ cifs_get_file_info(struct file *filp) struct cifsFileInfo *cfile = filp->private_data; struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; + struct dentry *dentry = filp->f_path.dentry; + void *page = alloc_dentry_path(); + const unsigned char *path; - if (!server->ops->query_file_info) + if (!server->ops->query_file_info) { + free_dentry_path(page); return -ENOSYS; + } xid = get_xid(); rc = server->ops->query_file_info(xid, tcon, cfile, &data); @@ -907,7 +912,14 @@ cifs_get_file_info(struct file *filp) data.symlink = true; data.reparse.tag = IO_REPARSE_TAG_SYMLINK; } + path = build_path_from_dentry(dentry, page); + if (IS_ERR(path)) { + rc = PTR_ERR(path); + goto cgfi_exit; + } cifs_open_info_to_fattr(&fattr, &data, inode->i_sb); + if (fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) + cifs_mark_open_handles_for_deleted_file(inode, path); break; case -EREMOTE: cifs_create_junction_fattr(&fattr, inode->i_sb); @@ -937,6 +949,7 @@ cifs_get_file_info(struct file *filp) rc = cifs_fattr_to_inode(inode, &fattr); cgfi_exit: cifs_free_open_info(&data); + free_dentry_path(page); free_xid(xid); return rc; } @@ -1171,6 +1184,8 @@ static int cifs_get_fattr(struct cifs_open_info_data *data, } else { cifs_open_info_to_fattr(fattr, data, sb); } + if (!rc && fattr->cf_flags & CIFS_FATTR_DELETE_PENDING) + cifs_mark_open_handles_for_deleted_file(*inode, full_path); break; case -EREMOTE: /* DFS link, no metadata available on this server */ @@ -1399,6 +1414,8 @@ int smb311_posix_get_inode_info(struct inode **inode, goto out; rc = update_inode_info(sb, &fattr, inode); + if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) + cifs_mark_open_handles_for_deleted_file(*inode, full_path); out: kfree(fattr.cf_symlink_target); return rc; @@ -1560,6 +1577,9 @@ struct inode *cifs_root_iget(struct super_block *sb) goto out; } + if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING) + cifs_mark_open_handles_for_deleted_file(inode, path); + if (rc && tcon->pipe) { cifs_dbg(FYI, "ipc connection - fake read inode\n"); spin_lock(&inode->i_lock); @@ -1850,16 +1870,20 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry) psx_del_no_retry: if (!rc) { - if (inode) + if (inode) { + cifs_mark_open_handles_for_deleted_file(inode, full_path); cifs_drop_nlink(inode); + } } else if (rc == -ENOENT) { d_drop(dentry); } else if (rc == -EBUSY) { if (server->ops->rename_pending_delete) { rc = server->ops->rename_pending_delete(full_path, dentry, xid); - if (rc == 0) + if (rc == 0) { + cifs_mark_open_handles_for_deleted_file(inode, full_path); cifs_drop_nlink(inode); + } } } else if ((rc == -EACCES) && (dosattr == 0) && inode) { attrs = kzalloc(sizeof(*attrs), GFP_KERNEL); diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c index 0748d7b757b9..9428a0db7718 100644 --- a/fs/smb/client/misc.c +++ b/fs/smb/client/misc.c @@ -853,6 +853,40 @@ cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path) free_dentry_path(page); } +/* + * If a dentry has been deleted, all corresponding open handles should know that + * so that we do not defer close them. + */ +void cifs_mark_open_handles_for_deleted_file(struct inode *inode, + const char *path) +{ + struct cifsFileInfo *cfile; + void *page; + const char *full_path; + struct cifsInodeInfo *cinode = CIFS_I(inode); + + page = alloc_dentry_path(); + spin_lock(&cinode->open_file_lock); + + /* + * note: we need to construct path from dentry and compare only if the + * inode has any hardlinks. When number of hardlinks is 1, we can just + * mark all open handles since they are going to be from the same file. + */ + if (inode->i_nlink > 1) { + list_for_each_entry(cfile, &cinode->openFileList, flist) { + full_path = build_path_from_dentry(cfile->dentry, page); + if (!IS_ERR(full_path) && strcmp(full_path, path) == 0) + cfile->status_file_deleted = true; + } + } else { + list_for_each_entry(cfile, &cinode->openFileList, flist) + cfile->status_file_deleted = true; + } + spin_unlock(&cinode->open_file_lock); + free_dentry_path(page); +} + /* parses DFS referral V3 structure * caller is responsible for freeing target_nodes * returns: diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c index 69f3442c5b96..429d83d31280 100644 --- a/fs/smb/client/smb2inode.c +++ b/fs/smb/client/smb2inode.c @@ -561,8 +561,15 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon, case SMB2_OP_DELETE: if (rc) trace_smb3_delete_err(xid, ses->Suid, tcon->tid, rc); - else + else { + /* + * If dentry (hence, inode) is NULL, lease break is going to + * take care of degrading leases on handles for deleted files. + */ + if (inode) + cifs_mark_open_handles_for_deleted_file(inode, full_path); trace_smb3_delete_done(xid, ses->Suid, tcon->tid); + } break; case SMB2_OP_MKDIR: if (rc) -- 2.39.2